ML20211C631
| ML20211C631 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/05/1997 |
| From: | Scaggs J NORTHEAST NUCLEAR ENERGY CO. |
| To: | |
| Shared Package | |
| ML20211C529 | List: |
| References | |
| SP-3712TC, NUDOCS 9709260259 | |
| Download: ML20211C631 (80) | |
Text
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Level of Use Subject Matter Expert: 1.scaggs General 9709260259 970918 PDR ADOCK 05000423 P PDR
t < Millstone Unit 3 Maintenance Procedure 6.9 KV Containment Penetration lireaker l'M TAHI II OF CONTENTS
- 1. PURPOSE....................................................3
- 2. 1 R ER EQ U I SITES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
- 3. P R E CAUTI O N S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
- 4. I N ST R U CT I O N S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1 4.1 Initial litcaker PM Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 l 4.2 Arc Chate Removal, inspection and Cleaning . . . . . . . . . . . . . . . . . 7 4.3 Primary liushing Cleaning and inspection . . . . . . . . . . . . . . . . . . . 10 4.4 G e ne ral i nsper ' % n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 1 1 4.5 Driving and Ltuhing Pan Inspection . . . . . . . . . . . . . . . . . . . . . . . 14 4.6 Driving and Latching Pawl Adjustments (not required for PM) . . 15 4.7 . Wipe Measurements and Contact Resistance Measurements of S w it c h e s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.8 Striker Plate inspection [Ref 6.8) . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.9 Main and Arcing Contact Inspection . . . . . . . . . . . . . . . . . ._ . . . . . . 28 4.10 Flexible Braid Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4.11 Release Ccil Resistance Measurement . . . . . . . . . . . . . . . . . . . . . . , 30 4.12 Eip Coil Resistance Measurement . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.13 Release Latch Roller Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.14 ML- 13 Operating Mechanism inspection . . . . . . . . . . . . . . . . . . . 33 4.15 Prop Pin Clearance Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4.16 Prop Pin Assembly inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 4.17 Multiple Wipe Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4.18 Primary Con tact Wipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , 40 4.19 13uffer Block Clearanec Measurement . . . . . . . . . . . . . . . . . . . . . . . 43 4.20 Primary Con tact G ap . . ._. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 4.21 Trip Arm a t u re Travel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 4.22 Rip and Release Latch Latch wipe . . . . . . . . . . . . . . . . . . . . . . . . . 49 4.23 Trip Coil Pick-up Voltage Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 4.24 B re ak e r Asse mbly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 4.25 Plunger Interlock IIcight Measurement . . . . . . . . . . . . . . . . . . . . . 57 SP 3712TC Level of Use gp %g" Mg; '~REViEI Rev.0 General ,
r x . . m ~ l uf 69
. . ) l P , 4.26 Megger Testing ......................................... 58 1 4.27 Opera tional Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 ; 4.28 Opening Spring Safety Blocking Device Removal . . . . . . . . . . . . . 62 J. R EVIEW AN D SIG NOFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 I
- 6. R E F E R E N C ES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 !
- 7. S U M hi A RY OF Ci l A NG ES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 ATTACllMENTS AND FORMS Attachment 1,"Dicharge Crank Pin and Secondary Coupler" . . . . . . . . . 65 ,
Attachment 2, " Plunger Interlock Clip Location" . . . . . . . . . . . . . . . . . . . 66 Attachment 3,"ML-13 Operating Mechanism Assembly" . . . . . . . . . . . 67 Attachment 4," Recommended Lubrication Points" . . . . . . . . . . . . . . . . . 68 j Attachment 5, " Prop Pin Adjustment Diagram" . . . . . . . . . . . . . . . . . . . . . 69 : Maint. Form 3712TC-1,"6.9 KV Containment Penetration Hrcaker PM" 9 i i
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SP 3712TC Level of Use j rgToP "THiNK" GAcT E " nevisW" acy, o General J^ "w r - 2 or 69
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j 1. PURPOSE 1.1 Objective This procedure provides the instructions to perform preventive maintenance on containment penetration 6900 volt circuit breakers as required by 'lechnical Specification Surveillance Requirement 4.8.4.1.b. 1.2 Discussion ! Surveillance requirement 4.8.4.1.b requires that at least once every 60 - I months an inspection and preventive maintenance is performed on all ' penetration conductor overcurrent protective devices. Satisfactory completion of this procedure meets the requirements for 6900 volt circuit breakers, , 1.3 Applicability l This procedure applies to General Electric, type 6900 voll magna-blast l circuit breakers described in Technical Specifications, Millstone Nuclear Power Station, Unit No. 3, OPS Form 3273 3/4.3.8.4.1," Containment ! Penetration Conductor Overcurrent Protective Devices." This surveillance applies in Modes 1,2,3, and 4 , 1.4 Frequency
- At least once every 60 months,100% of the penetration breakers shall be
! subjected to an inspection and preventive maintenance. 2, PREREOUISITES
- - 2.1 General I
l 2.1.1 AWO has been authorized by Operations prior to beginning L work. 2.1.2 All required tagging, electrical and mechanical, has been placed prior to beginning work. , 2.1.3 Retest requirements have been specified in the AWO rctest block in accordance with Maint. Form 3702D- 4 " Electrical Equipment i Retest Matrix" for air-circuit breakers. 1 I A A SP 3712TC Level of Use r 370p e 4 7sigg ' sac 77 neyje g Rev.0 i General F% 6~ 3 0f 69 l r
4 f . 2.2 Definitions ; 2.2.1 WIPE - defined as a gap measurement or as a grease impression Section 4.22. 2.2.2 N.O. - defined as Normally Open. 2.2.3 N.C. - defined as Normally close. 2.2.4 SLOW-CLOSE - A manufactures term for gradually placing a breaker in the close position. 2.3 Measuring and Test Equipment (hf&TE) 2.3.1 Click type and dial type torque wrenches are calibrated in I accordance with WC 8," Control and Calibration of hicasuring and Test Equipment." Unless otherwise specified, any click or dial type torque wrench with a valid calibration label is acceptable i for use with this procedure provided the required torque is between 20 and 100 percent of full scale. The torque wrenches associated with this procedure are required to apply the following torques:
- 25 in-lbs in step 4.4.15 2.3.2 Dh1M, one of the following:
- Fluke biodel 8060A
- Fluke Model 8050A
- Fluke Model 27 2.3.3 Long and Short Feeler Gage set 2.3.4 Megger, Simpson Model 401 2.3.5 Prop Pin Spacing Tool 2.4 Tools and Consumables 2.4.1 Manual charging wrench with 5/8i nch socket or5/8inch ratchet wrench 2.4.2 IIEPA vacuum cleaner e
SP 3712TC Level of Use tsTor "VHINE' dT5 REVIEV Rev. 0 General .
, #x Fe 4 0f69
t , 2.4.3 hiirror 2.4.4 Arc chute lifting device l 2.4.5 Clean petroleum solvent (isopropyl alcohol) I l 2.4.6 Variable DC power supply (0 - 120 VDC) . l 2.4.7 Spring blocking devices both opening and closing 2.4.8 Ruler 2.4.9 Plunger Interlock Mr asurement Device The following spare parts have been verified available prior to the start of work. 2.4.10 Glilutvicant D50lll5 (clear) 2.4.11 GIIlubricant D6A15Al or hiobil 28 grease (red) 2.4.12 Lubricating oils:
- SAE 20 or 30 Syntheti all GE D6326Al
- 3. PRECAUTIONS 3.1 When worki..,, un 6900 volt breakers, the two man rule is in effect during any of the following:
. Ilreaker is in its cubicle
. Ilreaker is closed
. Ilreaker is charged 3.2 When working on mechanism in the " CLOSED" or "CilGD" position, fingers must be kept clear of linkage, as accidental tripping can cause severe injury.
3.3 When using closing spring blocking device, the device must be fully seated at all times. 3.4 The breaker must not be left in the " CLOSED" or "CHGD" position while unattended. SP 3712TC Level of Use sToe THiNK AcT: nEVIEW Rev, O General 5 of 69
I 3.5 When lubricating breaker mechanisms, do not mix different grease types.
- 3.6 These breakers may contain polycarbonate mater 'such as lexan. Use
- caution when using solvents as some solvents are 1. .;mful to these materials.
3.7 Aic Chutes contain asbestos. Use proper ast estos precautions as prescribed in U3 WCl (Att 8)," Control of Asbestos Containing Materials" when handling or disassemblirg breakers and cleaning cubieles. i 4 4 SP 3712TC Level of Use 37ap: ' TsiNK-TACT neview acy, o General 6 of 69
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- 4. INSTRUCTIONS 4.1 Initial llreaker PM Preparation STOP WARNING STOP Arc Chutes contain asbestos. Take necessary precautions as prescribed in U3 WCl (Att 8)," Control of Asbestos Contaming Materials ' when handling or disassembling breakers and cleaning cubicles.
4.1.1 REMOVE breaker from cubicle. 4.1.2 COMPLETE Section "A" of Maint. Form 3712TC- 1. STOP WARNING STOP Line side connections in cubicle may be energized. Extreme caution should be exercised, when working in cubicle.
. 4.1.3 CLEAN breaker cubicle with a HEPA vacuum cleaner. .
4.1.4 VERIFY breaker is open. 4.1,5 VERIFY charging springs are discharged. 4.1.6 REMOVE operating mechanism cover plate. 4.2 Arc Chute Removal, Inspection, and Cleaning 4.2.1 REMOVE box barriers. 4.2.2 CLEAN box barriers and arc chutes as necessary with a HEPA vacuum and lint free rags. 4.2.3 VERIFY are chutes are marked with their corresponding phase. 4.2.4 IE available, INSTALL protective covers on bushings. SP 3712TC Level of Use Moe " WE EAcT? ' neview acy, o General 4 4 7 of 69
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r . h* NOTE l It is permitted to loosen bolts on other arc chutes other than the onc
' immcdiately being removed for convenience purposes.
L j_ 4.2.5 REh10VE arc chute as follows: . a. LOOSEN, but do not remove,2 upper are chute support ]- bolts.
- b. LOOSEN and fully DACK OFF lower support clamp bolt.
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- c. PLACE lifting hoist into position,
- d. POSITION grappling hooks on applicable are chute lifting bolts.
- c. REhiOVE slack in cable,
- f. Using lifting hoist, simultaneously LIFF arc chute and PULL bottom of arc chute from its' support bracket.
- g. REhiOVE arc chute,
- h. Carefully LOWER arc chute to floor.
4.2.6 REPEAT step 4.2.5 and REhiOVE remaining are chutes. 4.2.7 VACUUh1 are chutes with a HEPA vacuum cleaner. SP 3712TC Level of Use es ;roF ? CTS "FfEVIEE[ Rev.0 Generai ' THi'Nf"
! 8 of 69
i .. , CAUTION , Arc chute ceramic fins and throat areas must not be sanded or cleaned with emery cloth or other metallic abrasives. 4.2.8 Refer To Figure 1 for component location and using sandpaper or scotch bright, CLEAN arc chute metal throat runner and inside surfaces of micarta insulating material. Figure - 1 End View of Arc Chute UFTING BOLTS ( i
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gt!~ PINS W CERAMIC FINS /rHROAT AREA ,
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- METALTHROAT RUNNER
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5 MICARTA INSULATING MATERIAL 1 gL 1hir1 NOTE
- 1. Cracks which have formed in the ceramic fins are to be expected in ceramic materials of this type when subjected to severe heat of an arc.
These cracks do not interfere with the proper functioning of the device in any way and therefore, can be ignored.
- 2. Small broken corners on the exhaust end of the are chute sidca c.m also be ignored.
4.2.9 INSPECT conclition of ceramic fins on arc chutes.
. 1E satisfactory, RECORD on Maint. Form 3712TC- 1.
. IE any fins are broken off, CONSULT FLS.
SP 3712TC Level of Use sT F 'WINT " NT6 REVIEVE Rev 0 General 9 of 69
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-t , 4.2.10 Refer To Figure 1 for pin location and INSPECT pins for any signs rubbing or damage and RECORD on Maint. Form 3712TC-1.
- a. IE any signs of rubbing or damage are present, PIACE a check in the " REQUIRED" box on page 9 of Maint. Fonn 3712TC-1.
- 1) IE damage has occurred, NOTIFY Maintenance Supervisor.
- 2) Using white-out, MARK ends of both pins located at center portion of each are chute as shown on Figure 1.
- b. IE rubbing or damage is not present, PIACE a check in the .
"NOT REQUIRED" box on page 9 of Maint. Form 3712TC-1. ,
4.2.11 Refer to Figure 2 and Visually INSPECT plastisol Ocxible
- covering on arc chutes for breaks or holes.
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- a. IE satisfactory, RECORD on Maint. Form 3712TC-1.
- b. IE there are any holes or breaks in cover (s), CONSULT FLS.
l Figure - 2 Side View of Arc Chute , i
" ~L-4 _ _J
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) NOrE: ALL SHADED AREAS ARE 5 THE PLASTISOL MATERIAL E !
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x - 5 i oo . h r =1 4.3 Prunary Bushings Cleaning and Inspection 4.3.1 REMOVE old grease from contact balls. 4.3.2 IE necessary, using scotchbrite, lightly POLISH contact balls on primary bushings. SP 3712TC Level of Use e sTop' "THINK' LACT REVIEVI Rev.O General 10 of 69
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- . 4.3.3 - INSPECT cach bushing for damage, i
- a. 1E satisfactory, RECORD on Maint. Form 3712TC-1.
! b. IE any bushing is damaged, CONSULT FLS.
'4.4 General Inspection 4.4.1- - At any time while slow-closing breaker or electrically closing
- breaker,1E driving eccentric will not advance ratchet whcci properly, Refer To Section 4.6 and PERFORM driving and latching pawl adjustment.
4.4.2 Using charging wrench, TURN driving eccentric to manually charge closing springs. 4.4.3 At bottom of closing springs, INSERT spring blocking device into holes. 4.4.4 PRESS manual close button. 4.4.5 SLOW-CLOSE breaker. 4.4.6 OPEN breaker. 4.4.7 CLEAN breaker as necessary. 4.4.8 REMOVE grease from ground bus stab. SP 3712TC
- Level of Use Woe F
%# @f "neviev/ gey, o General , " 11or69
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4 4.4.9 PERFORM generalinspection and ENSURE the following are securely mounted'and in good physical condition.
- Trip coil bracket and trip coil
- Nylon bolts and nuts i
- Breaker wiring Discharge crank pin (Attachment 1)
- Switches i
. Terminations Relay (including contacts)
- Secondary coupler (Attachment 1) 4
. Plunger interlock clip (Attachment 2) 4.4.10 E deficiencies are found which require repair or replacement, CONSULT FLS.
4.4.11- RECORD on Maint. Form 3712TC-i. NOTE Some charging motors have glue on the brush caps to secure, this is not required. 4.4.12 PERFORM charging motor brush inspection as follows: a a. INSPECT condition of commutator. 4
- b. MEASURE brush length.
- c. E brush length is less than 0.25 inches, REPLACE brushes.
- d. VERIFY brush holders are aligned.
- c. RECORD inspection on Maint. Form 3712TC-1.
SP 3712TC Level of Use %op g acp evievj Rev.0
- General , , 12 0f 69
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-NOTE The locknut and adjusting bolt are located on the right side of the breaker as shown in Figure 3.
4.4.13 VERIFY locknut for adjusting bolt of positive interlock roller is tight and RECORD on Maint. Form 3712TC-1. i Figure - 3 l Positive Interlock Locknut and Adjusting Bolt i i ex w POSITIVE INTERLOCK MSTM RQLLR ARA 4
- r--l O rg
) i posmvE wEsoCx RaLER M: j ., n -- RATCHET WHEEL j 1 4.4.14 - PULL positive interlock arm toward front of breaker and RELEASE. 1 b a. E arm freely returns to its original position, RECORD on Maint. Form 3712TC-1. s a
- b. JE arm does not freely return to its original position, PERFORM the following
- 1) Using lubricating oil, LUBRICATE positive interlock shaft at points were shaft goes through frame.
- 2) - ACTUATE arm manually until positive interlock arm moves freely.
- 3) E arm does not move freely, NOTIFY Maintenance Supervisor.
Level of Use sToe' 'T'HINK ' lAdf 'RElEv[ Rev 0 General 13 of 69
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4.4.15 - LOOSEN mounting bolts on stationary auxiliary switch and TORQUE to 23 to 27 in-lbs and RECORD on Maint. Form 3712TC-1, i 4.5 Driving and Latching Pawl Inspection NOTE It may be necessary to use the manual charging wrench to position the ratchet whcci so each pawl being inspected is free to be lifted with a screwdriver. 4.5.1 Using a screwdriver, LIFT 1 pawl from ratchet wheel. 4.5.2 Quickly PULL screwdriver out and ALLOW pawl to snap back , into place. NOTE Possible causes of pawl failing to snap back into position is a bent spring, corrosion on pin, or bushing sliding partially out of pawl. 4.5.3 Visually OBSERVE that pawl freely falls into place, with no binding. 4.5.4 IE binding occurs, PERFORM the following:
- a. REMOVE pawl assembly.
- b. DISASSEMBLE assembly,
- c. INSPECT assembly for any damage,
- d. JE any component is found to be damaged or needs replacement, CONSULT FLS.
- c. CLEAN and LUBRICATE assembly.
- f. ASSEMBLE pawl assembly,
- g. INSTALL pawl assembly.
- h. REPEAT Section 4.5.
SP 3712TC Level of Use l gopy '5 gig gp wieyt Rev.0 General : *N " 14 of 69
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4.5.5 WilEN all pawls are satisfactory, RECORD on Maint. Form 3712TC-1. 4.5.6 REPEAT Section 4.5 for the 2 remaining pawls. 4.6 Driving and Latching Paul Adjustment (Not Required for PM) NOTE
- 1. The following section is to be performed if while attempting to slow-close tlic breaker, the ratchet whcci and pawls do not function properly.
- 2. This section may also be used if a problem occurs while electrically charging the closing springs.
4.6.1 _ Using charging wrench, manually TURN drive motor eccentric until charging springs are fully charged. 4.6.2 IE installed, REMOVE blocking device from closing springs. 4.6.3 PUSil manual close lever and CLOSE breaker. 4.6.4 PUSI-I manual trip lever and OPEN breaker. 4.6.5 Using charging wrench, CONTINUE turning drive motor eccentric until charging springs are charged. 4.6.6 - Using manual charging wrench, slowly ROTATE ratchet wheel until driving pawl has traveled through its return stroke. s SP 3712TC Level of Use r STop 'THlNi !ACT9 REVIEW' Rev.0 General i s 15 0f 69
4.6.7 Refer To Figure 4 and MEASURE clearance between driving pawl and ratchet wheel tooth.- Figure - 4 Driving Pawl and Ratchet Wheel Clearance ACCEPT ANCE CRITERI A IS GREATER TMAN d OR EQUAL TO 0015 INCH g 0 016 INCM i RATCHET WHEEL i 4 DftWNO PAWt i
- 4.6.8 E clearance is 2. 0.015 inch, RECORD on Maint. Form l 3712TC- 1.
4.6.9 E driving pawl clearance is less than 0.015 inch, ADJUST clearance as follows. 4
- a. INSTALL blocking device on closing springs.
j b. LOOSEN motor support bolts. NOTE Moving motor assembly to rear will raise the iatching pawl clearance (as !- shown on Figure 5) and moving to front will raise drivmg pawl clearance. When adjustmg pawl clearances, move motor assembly approximately 1 twice the dimension required at pawl, i c. MOVE motor assembly as necessary to achieve proper clearance, i
- d. TIGHTEN motor support bolts.
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- e. REMOVE blocking device on closing springs,
- f. VERIFY breaker is . pen and springs are discharged.
i SP 3712TC Level of Use :sToP" 'mlNK' hhCT5 REVIEW Rev.0
- General ,
- 16 of 69
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- g. Go To step 4.6.6.
4.6.10 Using manual charging wrench, slowly ROTATE ratchet whcci until driving pawl has advanced ratchet whcci tooth to maximum position. 4.6.11 Refer To Figure 5 and MEASURE clearance between front latching pawl and ratchet wheel tooth. Figure - 5 Latching Pawl and Ratchet Wheel Measu ment REAR
0" ~
l. FRONT 1.ATCHING w : PAWL l xomiNC[ \ *^'""*"'" l RATCHET WHEEL ACCEPTANCE CRITERI A IS GREAttR 1HAN 083 EQUAL TO 0015 INCH 4.6.12 E clearance is .>_0.015 inch, RECORD on Maint. Form 3712TC- 1. 4.6.13 E latching pawl clearance is less than 0.015 inch, make adjustments as follows.
- a. INSTALL blocking device on closing springs,
- b. LOOSEN motor support bolts.
NOTE Moving motor assembly to rear of breaker will raise the latching pawl clearance and moving to front of breaker will raise driving pawl clearance. When adjusting pawl clearances, move motor assembly approximately twice the dimension required at pawl.
- c. MOVE motor assembly as necessary to achieve proper clearance.
SP 3712TC Level of Use STOP "THINK -ACT' ' REVIEW Rev. 0 l General 17 of 69
- d. TIGI-ITEN motor support bolts.
- c. REMOVE blocking device on closing springs.
- f. VERIFY breaker is open and springs are discharged.
- g. Go To step 4.6.6.
4.7 Wipe Measurements and Contact Resistance Measurements of Switches 4.7.1 INSPECT release latch monitoring switch as follows:
- a. DISCONNECT one lead from release latch monitoring switch and RECORD on Maint. Form 3712TC-1.
NOTE Reading must bc _< 1 ohm.
- b. Refer 10 Figurc 6 for switch location and MEASURE contact resistance of release latch monitoring switch (N.O.).
Figure - 6 Release Latch Monitu.ing and interlock Switch Locations and Wipe Measurements R esmoex swTesEs
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L / b s Q C. ) O "iLin" a ^ "S " LE$ E 0 O W2 tamu x.x
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O tru - U 1 SMTCH t NG SWITCH 2 J .MONIO NG SW CH
- c. RECORD resistance on Maint. Form 3712TC-1.
SP 3712TC Level of Use es toe VHINK NCf REViEET Rev. O General > 18 of 69
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.- d. 1E resistance reading is greater than 1 ohm, CONSULT FLS -
for corrective action.
- c. PRESS and HOLD manual close button, and using an ohmmeter set on maximum scale, ENSURE contact on release latch monitoring switch indicates open,
- f. IE release latch monitoring switch does not indicate open, PERFORM the following:
- 1) RELEASE manual close button. !
- 2) CONSULT FLS for corrective action.
I NOTE . If free movement is present, switch is satisfactory.
- g. PLACE finger on release latch monitoring switch button and FEEL for free movement,
- h. LE free movement is not present, PERFORM the following:
- 1) RELEASE manual close button.
- 2) CONSULT FLS for corrective action.
- i. RELEASE manual close button,
- j. IE switch was replaced, Go To step 4.7.1.b.
- k. CONNECT lead to release latch monitoring switch and RECORD on Maint. Form 3712TC-1.
NOTE Measurement must be s 1/32 (0.031) inch.
'l. MEASURE release latch monitoring switch wipe between switch actuation arm and switch mounting bracket and RECORD measurement on Maint. Form 3712TC-1.
SP 3712TC Level of Use sToP 2 38tM icTY MEVIE0f Rev. 0 General i9 or 69
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, m.1E measurement is not s 1/32 (0.031) inch, PERFORM the following:
- 1) BEND switch actuation arm as necessary to achieve-measurement. 4
- 2) Go To step 4.7.1.1.
- n. IF breaker has a tension style relcase latch monitoring spring, CHECK spring alignment and ENSURE spring coils carmot catch on switch mounting plate.
- o. RECORD on Maint. Form 3712TC-1, 4.7.2 INSPECT interlock switches 1 and 2 as follows:
NOTE Reading must be s 1 ohm,
- a. Refer To Figure 6 for switch location and MEASURE contact resistance of interlock switches 1 and 2 (N.O.),
- b. RECORD on Maint. Form 3712TC-1.
- c. IE any reading is greater than 1 ohm, PERFORM the following:
- 1) CONSULT FLS for corrective action.
- 2) WHEN correctiv action is complete, Go To step 4.7.2.
- d. PULL and HOLD positive interlock roller, and using an e ohmmeter set on maximum scale, ENSURE contacts on interlock switches indicate open,
- c. IE cither interlock switch does not indicate open, PERFORM the following:
- 1) RELEASE positive interlock roller.
- 2) CONSULT FLS for corrective action.
- 3) WHEN corrective action is complete, Go To step 4.7.2.
SP 3712TC Level of Use "gy Sgg- gg ghigg gev 9 General y% - f 20 of 69 '
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- NOTE p
If free movement is present, switch is satisfactory. i < I, PLACE finger on switch button and FEEL for free movement.
- g. IE free movement is not present, PERFORM the following:
i) RELEASE positive interlock roller, i l 2) CONSULT FLS for corrective action. . 3) WHEN corrective action is complete Go To step 4.7.2.
- h. RELEASE positive interlock roller.
i i. MEASURE interlock switch wipe between interlock switch i actuation arm and switch mounting plate and RECORD on Maint. Form 3712TC- 1. i j, . 1E measurement is not .<_1/32 (0.031) inch, PERFORM the
- following
r ! 1) BEND switch actuation arm as necessary to obtain 4
- proper measurement.-
. 2) REPEAT step 4.7.2.i. ) 4.7.3 INSPECT latch check switch as follows: ll l~ a. REMOVE lower striker plate cover. ! b. VERIFY mechanism linhage is reset as indicated by manual
- trip lever being vertical.
I
- c. IE manual trip lever is not vertical, slowly CHARGE springs until mechanism resets,
{ n $ SP 3712TC - Level of Use :sToP 'THiNF ' %cP 'lienvi Rey, o General -
^
21 of 69
i
, e-
- NOTE 1
- Reading must be s 1 ohm. -
- d. Refer To Figure 7 for switch location and MEASURE contact -
resistance of latch check switch (N.O.). I
- c. RECORD contact resistance on Maint. Form 3712TC-1.
[ f. IE reading is greater than 1 ohm, PERFORM the following: r
- 1) __ CONSULT FLS for corrective action.
i
- 2) WHEN corrective action is complete Go To step 4.7.3.d.
p
- g. PRESS and I-lOLD manual trip lever and using an ohmmeter set on maximum scale, ENSURE contacts on latch check
- - switch indicates open.
l h. E latch check switch does not indicate open. PERFORM the
' following:
[ . 1) RELEASE manual trip lever. 9 l_ 2) CONSULT FLS for corrective action. i
- 3) WHEN corrective action is complete Go To step 4.7.3.d. !
NOTE-If free movement is present, switch is satisfactory.
- i. PLACE finger on switch button and FEEL for free movement,
- j. E free movement is not present, PERFORM the following:
1)' RELEASE manual trip lever.
- 2) CONSULT FLS for corrective action,
- 3) WHEN corrective action is complete Go To step 4.7.3.d.
s .. 4
"* ^
Level of Use wffpr 7kiNF
- TAcf7 "hEVIEW
[_ SP 3712TC Rev. O Generai . ,- # - pi 7 n4 22 of 69 -
V .
- k. RELEASE manual trip lever. ]
4.7.4 Refer To Figurc 7 and PERFORM trip latch to stop pin gap l measurement and switch actuation arm to switch support gap measurement on latch check switch as follows: Figure - 7 Trip Latch and Latch Roller Measurement R cauttnim
=*
Wjy,",ECK 'sn >$cn W~ L W L-Q' 7 i O \j n ~ '<* ~ ~ o osa noon a L m,
. aren
,i...-
4 , 7-utennouta g L - T*; g
^.
- a. PRESS manual trip lever until latch check switch contact opens, as indicated by an ohmmeter set on maximum scale.
- b. Slowly ALLOW manual trip lever to return toward vertical position.
- c. WHEN latch check switch contact closes, HOLD manual trip lever at that position.
NOTE Mcasurement must be 0.0625 (0.0580 to 0.0680) inch,
- d. MEASURE trip latch to stop pin gap as shown in Figure 7 and RECORD as found measurement on Maint.
Form 3712TC-1. SP 3712TC Level of Use :STOP 'ThlNK" 5ACTF ~ REVIEW Rev.0 General . - 23 of 69
l NOTE ! Measurement must be 11/c4 (0.016) inch. 3 ! c. MEASURE switch actuation arm to switch support gap on 4 latch check switch as shown in Figurc 7 and RECORD as found measurement on Maint. Form 3712TC-1. < f. IE gap between trip latch and stop pin is 0.0625 (0.0580 to [ 0.0680) inch AND gap between switch actuation arm and . i switch support is 21/ 46 (0.016) inch, Go To step 4.7.4.h. i j g. PERFORM the following to correct gaps: i . 1 1) RELEASE manual trip lever.
- 2) HEND switch actuation arm as necessary to achieve measurements, i
4- 3) PRESS manual trip lever untillatch check switch contact
- l. opens, as indicated by an ohmmeter set on maximum i scale.
) 4) Slowly ALLOW manual trip lever to return toward vertical position. i
- 5) WHEN latch check switch contact closes, HOLD manual
- trip lever at that position.
- 6) MEASURE trip latch to stop pin gap as shown in Figure 7.
- 7) MEASURE switch actuation arm to switch support gap on latch check switch as shown in Figurc 7.
- 8) REPEAT step 4.7.4.g. until gap measurements are within acceptance criteria,
- h. RECORD as left measurements on Maint. Form 3712TC-1.
- i. RELEASE manual trip lever.
SP 3712TC l Level of Use sW ipk" W: FIEViEW ' Rev.0 , Geneial 24 of 69
k h NOTE Measurement must be 1/ 32 to 1/16 (0.031 to 0.063) inch.
- j. Refer To Figure 7 and MEASURE gap between trip latch and latch roller.
- k. RECORD measurement on Maint. Form 3712TC-1.
- 1. IE gap is not 1/ 32 to 1/16 (0.031 to 0.063) inch, REOUEST further recommendations from GE.
4.7.5 INSPECT power switches 1,2, and 3 as follows: NOTE Readings must be .c 1 chm,
- a. Refer To Figure 8 for switch location and, using an ohmmeter, ,
MEASURE contact resistance on power switches 1 and 2 (N.O.). Figure - 8 Power Switch Location and Wipe g
=
switch ST RIKER O - 8 POWER SwiTCHEE T
]
~
o
)o 3 J
, 1/32 P030
' TT' TC INCH OR LESS BOLT
-A
- b. - RECORD resistance of power switches 1 and 2 on Maint.
Form 3712TC-1. SP 3712TC Level of Use srdP 4 MHNk' M RWlEV Rev.0 General y , 25 of 69
i .
; c. Using an ohmmeter set on maximum scale, ENSURE power switch 3 (N.C.) indicates open,
- d. IE cither of the following conditions exist, CONSULT FLS:
Switch 3 does not indicate open.
- Power switch 1 M 2 reads > 1 ohm.
- c. MEASURE power switch wipe between switch striker and
- switch support, as shown in Figure 8 and RECORD on Maint. Form 3712TC-1,
- f. IE measurc..nent is not .<._1/32 (0.031) inch, PERFORM the
', following: i
- 1) LOOSEN switch mounting bolts.
- ' 2) ROTATE switch support to achieve proper measurement.
- 3) TIGIITEN switch mounting bolts.
- 4) REPEAT step 4.7.5.c.
- g. Manually CHARGE charging springs to its fully charged position.
- h. Refer To Figurc 8 for switch location and using an ohmmeter set on maximum scale, ENSURE power switches 1 and 2 indicate open.
NOTE Readings must be .$.1 ohm. 8 d
- i. MEASURE contact resistance of power switch 3 and RECORD resistance on Maint. Form 3712TC-1.
- j. IE the following condition exists, CONSULT FLS:
- Switch 1 M 2 does not indicate open.
j
- Power switch 3 reads > 1 ohm.
SP 3712TC
. Level of Use <g7a g x7gg gc77 geliEW~
Rev.0 General 26 of 69 i-
k, WIlEN contact resistance of power switch 3 is satisfactory, RECORD as left on Maint. Form 3712TC-1. STOP WARNING STOP Do not use_ finger will avoid possible(s) to feel for free movement. The use of a screwdriver bodily injury. NOTE If free movement is present, switch is satisfactory.
- 1. PLACE screwdriver on button of power switch I and FEEL for free movement. -
m.1E free movement is not present, PERFORM the following:
- 1) DISCHARGE charging springs.
, 2) CONSULT FLS. l 1 NOTE The following 2 steps will discharge the charging springs and place the breaker in a safe position. 4,7.6 CLOSE breaker. 4.7.7 OPEN breaker. 4.8 Striker Plate Inspection 4.8.1 VERIFY breaker is open. 1 Level of Use cs oe' " THINK ' FACT ' F5EVIEVI Rev. O General F 27 of 69
l1 * .
. NOTE A minor must be used to inspect underside of striker plate, 4.8.2 . INSPECT striker plate to breaker frame welds for any visible
,' cracks. 4.8.3 E cracks are found, CONSULT FLS, 4.8.4 RECORD on Maint. Form 3712TC-1. { ! 4.8.5 WHEN striker plate repair has been completed, INSTALL striker i plate cover, j 4.9 Main and Arcing Contact Inspection i 4.9.1 REMOVE grease from main contacts. 4 ! 4.9.2 INSPECT main contacts for burns :md pitting.
- E contacts are burnt or pitted, using a jewelers' file or scotch
. bright pad, CLEAN contacts as necessary. 4.9.3 RECORD on Maint. Form 3712TC- 1. 4.9.4 INSPECT arcing contacts for the following:
- Signs of abnormal scraping
- Signs of abnormal rubbing b
- Burns and pitting 3 4.9.5 E contacts are burnt or pitted, using a jewelers' file or scotch l
bright pad, CLEAN contacts as necessary. f 4.9.6 RECORD on Maint. Form 3712TC-1.
- 4.10 Flexible Braid Inspection 4.10.1 INSPECT flexible braids for broken strands or damaged flexible braids.
4.10.2 E flexible braids are damaged, CONSULT FLS. SP 3712TC
; Level of Use pop t THiNR' t 'hEVIEY[
;AcT' Rev 0
. General e
~
28 0r 69
j. i
- . .4.10.3 VERIFY tightness of bolts on flexible braids.
I 4
~4.10.4 RECORD on hiaint. Form 3712TC-1.
NOTE i This step is to be performed if arcing contacts are misaligned. L 4.10.5 PERFORhi arcing contact alignment checks as follows:
- a. SLOW-CLOSE breaker.
- b. OBSERVE movable arcing contact as it starts to connw. with j stationary arcing contact.
- c. IE contacts portions are not aligned, PERFORhi the j following:
i ! 1) COhiPLETE breaker closing cycle. STOP WARNING STOP
- Do not attempt to make any adjustments on a breaker which is in the closed position.-
1
- 2) TRIP breaker.
- 3) hiARK position of stationary arcing contact assembly to -
refer to when performing adjustments. [ 3
- 4) REhiOVE flexible braids from arcing contacts and stationary arcing contact assembly, i 5) LOOSEN contact support mounting bolts and ALIGN O stationary arcing contact support to anticipated path of movable arcing contact.
- 6) TIGHTEN bolts.
; 7) INSTALL stationary arcing contact assembly and 0 CONNECT flexible braid, 4
1 4
'
- SP 3712TC Level of Use- wop g g- ggp ' ygyigyi Rev. 0
- General . - r -
~
29 0f 69
^
. .=
_8). St.OW-CLOSE breaker and OBSERVE contacts as
. they make up.
- 9) REPEAT step 4.10.5.c. until all contacts align properly.
- d. E contacts still do not align properly, CONSULT FLS.
4.11 Release Coil Resistance Measurement NOTE Resistance should be 18.9 to 23.1 ohms. ! 4.11.1 Using a multimeter, from auxiliary switch terminal 1C to power i switch 3 black lead as shown in Figure 9, MEASURE resistance j of release coil. i Figure - 9 Stationary Aux Switch and Power Switches STATIONARY AUX SWITCH 7 6 3 TERMINAL rc sc so ic e j
@@@@ 4C 20 SC 6C
@ @ @ @ &*!a e s 4 2 4.11.2 RECORD on Maint. Form 3712TC-1.
4.11.3 E resistance is not 18.9 to 23.1 ohms, PERFORM the following:
- a. CONSULT FLS for corrective action,
- b. . WHEN corrective action is complete, Go To step 4.11.1.
SP 3712TC Level of USe "STOP "TNINf 4 C7 RENIEW Rev.0 General 30 of 69
. u 4.12 'lYip Coll Resistance Measurement 4.12.1 Using a multimeter, from pin 10 on secondary coupler to terminal 4C of stationary auxiliary switch as shown in Figure 10, MEASURE trip coil resistance.
4.12.2 RECORD resistance on Maint. Form 3712TC- 1. Figuro -10 Stationary Aux Switch and Sect adary Coupler
~
STATIONARY AUX SWITCH 7 5 3 1 j 7c E sc ic o LOJ o' PIN N g egg 0000 y , UMBER o _ 000o _@ @ r@m @ 0000 K ' p o o (o
@ @ @ @ '" art" e a 4 _S.ECONDARY COUPLER 4.12.3 IE trip coil resistance is not 18.9 to 23.1 ohms, PERFORM the following:
- a. CONSULT FLS for corrective action.
- b. WHEN corrective action is complete, Go To step 4.12.1.
4.12.4 VERIFY the following conditions:
- Breaker is open.
- Springs are discharged.
- Manual trip lever is reset as indicated by being in the vertical position.
SP 3712TC Level of Use - sTor THINK -l ACT " REVIEW Rev.O General 31 of 69
. . n 4,13 - Release Latch Roller Inspection i 4,13.1 Refer To Figure 11 and CLEAN outer surface of release latch l roller.
Figo ' - 11 Release LL i Roller ntaast tuo.noatn p
.- o I
_ . . _ _d IR To 3v 4.13.2 INSPECT outer surface of release latch roller for damage and excessive wear,
- a. E condition is satisfactory, RECORD on Maint. Form 3712TC- 1.
- b. E release latch roller is not satisfactory, CONSULT FLS.
4.13.3 VERIFY release latch roller moves freely,
- a. E satisfactory, RECORD on Maint. Form 3712TC-1.
C AUTIO N Y GE D6A15A1 and Mobil 28 are red greases and GE D50H15 is a clear grease. Do not mix red grease with clear grease. This may cause mechanical failure,
- b. E roller does not move freely, PERFORM the following:
- 1) Using D50lI15 grease (clear) or GE D6A15A1 grease (red) or Mobil 28 grease (red), LUBRICATE roller.
- 2) E lubricating rollers does not correct problem, CONSULT FIS.
1 SP 3712TC
-Level of Use 'stoF 'fHiNN" 7ACU ~~REVIEV[ Rev. 0 General ?~ '
320f69 )
4 4.14 ML-13 Operating Mechanism Inspection 4.14.1 Refer To Attachment 3 and CLEAN outer surfaces of the following:
. Trip latch roller
'
- Cam follower roller Rollers on trip latch 4.14.2 INSPECT trip latch roller, cam follower roller, and rollers on trip l latch for the following:
- a. Damage 4 b. Excessive wear
- c. All rollers turn freely i
- C A UTIO N GE D6A15Al and Mobil 28 are red greases and GE D50H15 is a clear grease. Do not mix red grease with clear grease. This may cause mechanical failure.
- d. - IE any roller (s) do not turn freely, using D50H15 grease (clear) or GE D6A15A1 grease (red) or Mobil 28 grease (red), LUBRICATE as necessary.
- IE lubricating rollers does not wecct problem, CONSULT FLS.
- c. IE any components is found to be damaged, CONSUI T FLS.
- f. RECORD on Maint. Form 3712TC-1.
4.14.3 Refer To Attachment 3 and INSPECT all components for any
. cracks, missing or damaged hardware and RECORD on Maint.
Form 3712TC- 1. 4.14.4 INSPECT upper and lower prop springs for signs of fatigue or breakage at coil to hook transition areas. [Ref 6.10] SP 3712TC Level of Use wsToP* " THINk
- ihTS REVIEW Rev.0 General 9 '
33 of 69
7.______.._.. 4.14.5 E puip springs show signs of fatigue, CONSUL:l' Fl S for corrective action. 4.14.6 Refer To Figure 12 and ViiltlFY vfper prop spring hook is scaled bCtWCCn WashCis on a%CIHbly. (NCf 6.10] ngure - 12 Upper Prop Sp ing l m B8tLAF.L M lUML % l m4 i/ ., Fil[ [
, ., . y t(ick NJt % MAMJM (W 1 WA$H( R O W ALMLR tt (W4 MCW4E) 4.14.7 VliRIFY washers are able to spin on assembly. [Ref 6.10)
- a. E satisfactory, Rl! CORD on hiaint. Form 3712TC-1.
- b. E prop spring does not have sulficient room to move, I'liltFORh1 the following:
- 1) 1.OOSliN locknut and ADJUST bolt assembly until washers can move.
- 2) TIGilTliN locknut and RIICORD on hiaint. Form 3712TC- 1.
4.15 l' rop l'in Clearance hicasuiement (Refer To Attachment 5) l NOTE hfcasurement should be 2 0.025 inch on both end;. 4.15.1 hiliASURiiclearance of prop pin to frame on bcth sides. 4.15.2 E clearance is.2.0.025 inch on both ends, RECORD on hiaint. Form 3712TC- 1. Level of Use SI' 3712TC STOP THINK ACT REVIEW Rev. O n al 34 of 69
4.15.3 IE clearance is < 0.025 inch on either t,ide, Piilli:ORM the
. following:
- a. On center crank, l.OOSliN clamp bolts.
- b. INSliitT spacing tool as shown in Figure 13.
Figure -13 Prop Pin Spacing Tool Location
,t.-f 7 -
. J . . _. L itP LATCH ROLLER , L N' PROP PIN
__ x _g . __ . b N SPACING TOOL.
,a
- c. 1E spacing tool cannot be inserted, l'OSITION center crank until spacing tool can be inserted.
- d. TIGl{ TEN center crank clamp bolts,
- c. REMOVE spacing tool.
- f. REPEAT Section 4.15.
SP 3712TC Level of Use sTop TsiNK ACT REVIEW Rev. O General 350r69 i
t , 4.16 Prop Pin Assembly inspection (iteferlb Attachment 3) CAUTION Y Physical contact between prop and snap ring or spacer washers may result in bicaker jamming in the closed position. 4.16.1 Using your finger, INSPECT washers and snap rings for i movement. 1
- a. E satisfactory, RECORD on hiaint. Form 3712TC-1.
- b. E movement cannot be felt, PERFORhi the following:
- 1) CONSUlX FIS for corrective action.
- 2) WIIEN corrective action is complete, REPEAT Section 4.16.
4.16.2 Visually INSPECT washers and snap ring for any signs of excessive rubbing or damage,
- a. E satisfactory, RECORD on hiaint. Form 3712TC- 1.
- b. E any part show signs of excessive rubbing or damage, PERFORh1 the following:
- 1) CONSUlJ FLS for corrective action.
- 2) lV11EN corrective action is complete, REPEAT Section 4.16.
4.16.3 Refer To Attachment 5 and VERlFY snap rings are fully scated in its groove as follows:
- a. INSERT screw driver on 1 side of prop pin assembly between prop pin and breaker frame and APPIA slight pressure to prop pin to verify snap ring is scated.
b, E snap ring is not scated, PERFORhi the following:
- 1) SEAT snap ring to its original position.
- 2) REPEAT step 4.16.3, SP 3712TC Level of Use 'STOP' ' THINK ~
> ACT' ' , _ _ . REVIEW Rev.0 Generai 36 of 69
-. ersaarisserme he.m . 3) E snap ting will not seat properly, CONSUL!r FLS for corrective action.
- WIIEN corrective action is complete, Rlil'ENT step 4.16.3.
- c. RiiPliN1' step 4.16.3. for opposite side of prop pin.
4.17 h1ultiple Wipe hicasurements 4.17.1 VERIFY breaker open. 4.17.2 CONNiiCT an ohmmeter to pin 13 and 14 on secondaiy coupler, 4.17.3 St.OW-CLOSli breaker until ohmmeter indicates continuity. I 4.17.4 hillASURE dimension "N as shown in Figure 14 on all three phases. Figure -14 Main and Arcing Contacts em a M > C. Attn 99y g
' t. 2- .----3 n
$HLA LD f1 M AflC ARY AFONO CON 1 ACT At 1MtS F9NT O
_-{ ~ , g o L@J u-4.17.5 RECORD as found measurements on hiaint. Form 3712TC-1. 4.17.6 E measurement on all three phases is 1 inch or greater, RECORD as left on hiaint. Form 3712TC-1. 4.17.7 E measure.nent on any phase is less than 1 inch, CONSULT FLS. 4.17.8 WIIEN dimension "N has been corrected, REPEAT Section 4.17. SP 3712TC I Level of Use STOP THINK ACT REVIEW Rev.O General 37 of 69 u - -
~
- 4.17.9 DISCONNECT ohmmeter from pin 13 and 14 on secondary
! disconnect. 4.17.10 CONTINUE to slow-close breaker, , 1 NOTE One or more arcing contact (s) may close sooner than the other. The intent of the following step is to ensure that the measurement is taken at the point which the arcing contact (s) just closes on each phase. 4.17.11 WilEN arcing contact (s)just touch, as indicated by an ohmmeter, llOLD charging wrench at this position. 4.17.12 MEASURE gap between stationary and movable primary contacts, dimension "H," as shown in Figure 15 on phases which indicaw continuity. Figuro - 16 Main and Arcing Contacts tautus w s u s, tac v aemmturn ger .
+
.o 0 te- t 4.17.13 RECORD as found measurements on Maint. Form 3712TC-1.
4.17.14 CONTINUE to slow-close breaker and 00 To step 4.17.11 for 1 remaining phases.
--4.17.15 IE measurements is 5/1 s inch or greater, RECORD as left measurement (s) on Maint. Form 3712TC-1.
4.17.16 IE any gap is less risan 5/1s inch, CONSULT FLS. Level of Use sTor "THtNk' "scT ' f' REVIEVI ev. 0 General ,
, =
38 0f 69
G l 4.17.17 E arcing contacts were replaced, Go To step 4.17.10 and IlliCORD as left measurement. 4.17.18 Refer To liigure 16 and Plil(1 ORM the following: rigure - 10 Ratchet Wheel Assembly HL A9 LATCH!NG PAWi f(CTH $ - TCOf M 1 j
%~w e nmt trema r.m li &C" p ' \
- e. -
dk) l c o ,, - MW 1 % [ m m ns
- a. LOCKfli and M ARK tooth 6 of ratchet wheel,
- b. CONTINUli to slow-close breaker until tooth number 6 on ratchet whcci has just passed rear latching pawl.
4.17.19 INSTALL opening spring safety blocking device. 4.17.20 E at any time an attempt is made to open breaker with opening spring safety blocking device installed, Refer To Section 4.28 and RiiMOVE blocking device. l \ SP 3712TC Level of Use _ STOP THINK ACT REVIEW Rev.O General 39 of 69
4.17.21 MEASURE prop pin to prop gap on left and right side using feeler gauge as slown in Figure 17. Figure - 17 Prop Pin to Prop Measutomant ed77El#l, n edoEm ,/ ut a n urm a
\' & 'O/,j' '
% et, s o T -
'N -
TN i/o n /nwu m m .. m m,9 [ ' w- D)- ?%; , .,., I d HQD 4.17.22 RECORD measurements on Maint. Form 3712TC-1, 4.17.23 E both measurements are 1/ s1 to 5/32 (0.063 to 0.156) inch, PERFORM the following:
- a. RECORD as left measurements.
i
- b. REMOVE opening spring safety blocking device.
4.17.24 2 cither measurement is not 1/is to S/32 (0.063 to 0.156) inch, PERFORM the following:
- a. CONSULT FLS for corrective action,
- b. WIIEN corrective action is complete, Go To 4.17.18.
4.18 Primary Contact Wipe
. 4.18.1 VERIFY breaker open.
4.18.2 VERIFY manual trip lever is reset as indicated by being in the vertical position. SP 3712TC Level of Use ;Sf0P' 'THINK 7 FACT REVIEW ~ Rev. O General , . . 40 0f 69
~
4,18.3 MEASURE dimension "C" as shown in Figure 18 on all three phases and RECORD as found data on Maint Form 3712TC-1, i Figure - 18 Main and Arcing Contacts e- , I I s-2[ Tc ' _L "3'" '
"',IO,'"
P "? Co,cACT y gi N AD.lJSilNO
%$y o CaoAct o xc, ,,, ,
P ! 4,18.4 SLOW-CLOSE breaker fully, , 4.18.5 INSTALL opening springs blocking device. 4.18.6 MEASURE dimension "D" as shown in Figure 19 on all three phases and RECORD as found data on Maint, Form 3712TC-1. Figure - 19 Main and Arcing Contacts V - PftMRT CONTACT WnPE ACCEP1 ANCE CRTERIA is 1/4 10 6/16 INCH .m ., , t M"T 1 o
- S OPEfMTING o - noo b) ;
*E"*
~
N CHECK NUT r SP 3712TC i Level of Use = 370pm 'THiNR MAcF 'neview Rev,0 Gleneral 3 41 of 69 i-
...-.__,.~-,....-__.,_,_.m..-_...,-, . . - . _ _ _ - . . _ _ _ , . . , . _ _ , - , , . . . , , . . . , - - _ _ , . . _ _ , - . - . , . . , , _ , = _ = _ , _ , , , , _ . - . ~
~
t 0 4.18.7 DETERMINE primary contact wipe for each phase by subtracting each dimension "D" (breaker closed) from dimension "C"(breaker open) and RECORD As found results as contact wipe on Maint. Form 3712TC-1. 4.18.8 IE primary contact wipe is not W to 5/3s inch for any phase. PERFORM the following: STOP WARNING STOP Do not attempt to make any adjustments on a breaker which is in the closed position. If the breaker madvertently opens, personnelinjury may result. NOTE Screwing down on adjusting nut increases wipe and screwing up on adjusting nut decreases wipe,
- a. REMOVE opening spring safety blocking device,
- b. TRIP breaker to open position,
- c. VERIFY manual lever is reset.
- d. For cach phase that is out of adjustment, LOOSEN check nut and turn adjusting nut as necessary, as shown in Figure 18,
- c. TIGilTEN check nut.
- f. CLOSE breaker,
- g. INSTALL opening springs blocking device _.
! h. MEASURE dimension "D" as shown in Figure 19 on all three phases,
- i. DETERMINE primary contact wipe for cach phase by subtracting each dimension "D" (breaker closed) from dimension "C" (breaker open).
i SP 3712TC Level of Use ' STOf THINK' (ACT= REVIEW Rev.O General - 420f69
- j. Rill'liAT step 4.18.8 to adjust wipe until proper wipe is obtained. .
i
- k. Will!N primary contact wipe is 1/4 to 6/ 30 inch on all l phases, RECORD as left measurements on hiaint. Form 3712TC- 1.
4.19 Ilutter lilock Clearance Measurement 4.19.1 VERIFY breaker is in the " CLOSED" position. 4.19.2 VERIFY opening spring safety blocking device is installed 4.19.3 MEASURl! clearance between contact arm and buffer block for each phase as shown in Figure 20 and RECORD on Maint. Form 3712TC-1. Figure - 20 Buffer Block Measurement a V s (0 000) INCH , BN[ \ j'< - N lO
\
g \ s n, o o s s
'df Ma" 7
CON 1ACT AnM 0
~
O utAsuntMENT SHAtt DE GREATER THAN OR 6 QUAL 10 1/ $$ to 063) INCH SP 3712TC Level of Use STOP THINK ACT REVIEW Rev.O General 43 of 69
4.19.4 lE clearance is less than 1/10 (0.063) inch on all phases, PERFORM the following: STOP WARN 1NG STOP Do not attempt to make any adjustments on a breaker which is in the closed position. If the breaker inadvertently opens,personnelinjury may result. NOTE i Screwing down on adjusting nut increases wipe and screwing up on I adjusting not decreases wipe,
- a. REMOVE opening spring safety blocking device,
- b. TRIP breaker to open position.
- c. For each phase that is out of adjustment, LOOSEN check nut and turn adjusting nut as necessary, as shown in Figure 20.
. d. TIGilTEN check nut.
- c. CLOSE breaker.
- f, INSTALL opening spring safety blocking device.
- g. REPEAT Section 4.19 until proper buffer block clearance is obtained. .
IE any buffe block adjustment was performed, Go To ) h. Section 4.18 and PERFORM primary contact wipe and buffer block clearance measurements.
- i. WIIEN buffer block clearance is.?_1/16i nch, KECORD on Maint. Form 3712TC- 1.
4.19.5 REMOVE open spring safety blocking device. 1 4.19.6 OPEN breaker. . SP 3712TC i Level of Use STOP THINK 3 EACT ' ' REVIEW Rev. O General , 44 of 69 5 a- - e, -ve,. r -w--r--m-ew-~.,- o- .---.g-,- , . , , , -,i.-.3.--..,_r,- wore, ec e,weam.-v._-..g,-,...wr,.7,-.,,,..mwy r -r m --y-r r-+e.1--w. ..rw,-m-e.,-g'er-e-
I 3 4.20 Primary Contact Gap ; 4.20.1 VERIFY breaker open. 4.20.2 MEASURE between stationary and movable primary contacts at dimension "E" as shown in Figure 21 and RECORD . measurements on Maint. Form 3712TC-1. , i Figure -21 , Opening Spring. Main and Arcing Contacts
@^
ACCEPTANCE CRITERIA FOR
*E' DIM.1S 5 Vs to 6 9/is INCH cwtcio4ut
- y yo \
N- 3
=
DEI onwiwo { S** N stAwgv E y' /
- =/+=
' *'**T ugAy,E c m tact O
0 _{_ O l i 4.20.3 1E primary contact gap is not 5 t/8 to 5 9/1s inches, PERFORM the following: i
- a. Using charging wrench, TURN driving cecentric to manually ,
ch* ge closing springs,
- b. PRESS manual close button,
- c. SLOW-CLOSE breaker enough to allow adjustment of stop plate.
1 A SP 3712TC Level of Use sToF 'Wdif ?ACTI "5E EVI Rev.0 General 7 3 g x J
'+ 45 of 69
j 5 e STOP W A R N I N (; STOP 11e extremely careful when making adjustments as the breaker is in the closed position and the opening springs are charged. NOTE
- 1. An opening spring blocking device may be used to block the opening spring.
- 2. Screwing down on stop plate decreases primary contact gap and screwing up on stop increases primary contact gap.
- d. E required, INSTALL opening spring blocking device.
- c. LOOSEN check nut.
- f. TURN stop plate on spring rod to make adjustment, as shown in Figure 21.
g, TIGilTEN check nut.
- h. E opening spring blocking device was installed, REMOVE opening spring blocking device,
- i. Fully CLOSE breaker,
- j. OPEN breaker,
- k. REPEAT Section 4.20 until proper primary contact gap is obtained.
- 1. RECORD on Maint. Form 3712TC-1.
- m. WIIEN measurement is 51/8 to 5 9/16 nches, i Refer To Sections 4.18 and 4.19 and VERIFY primary contact wipe and buffer block clearance measurements.
4.21 Wip Armature Wavel 4.21.1 VERIFY breaker open. 4.21.2 VERIFY release latch roller cican. SP 3712TC Level of Use <sToF "THINC .lACf REVIEV[ Rev.0 General .. 46 0f 69
l . j . .. I j , 4.21.3 On outer surface of release latch roller as shown on Figure 22, 4 Al' PLY a thin film of GE D6A15A1 grease (red) or Mobil 28 grense (red), d , Figure - 22 i Release Latch Roller i ntttAst latch hoLLtR I 7
. I seton CAM . o ,
7 .. y I 4.21.4 VERIFY trip latch roller is clean.
- 4.21.5 - On outer surface of trip latch roller as shown on Attachment 3, APPIX a thin filin of GE D6A15Al grease (red) or Mobil 28 grease (red).
4.21.6 INSTALL trip armature measuring tool onto trip coil shcft as ! shown in Figure 23. Figure - 23 Trip Armature Measurement fBP ARMATURE HANDWHEEL - - MFASU4NO TOOL
$k. %
/
g 'O THIP Coll SLACM AREA l '
\ TNP
\ I ARMAfURE N,
QN RMf .T '
,\
- ,P UNMOE TRS ARMATURt: f *"
gg N TRIP SHAM 5" 5" f *# ,
/g 4.21,7. ADJUST handwhcci until linkage just starts to pickup.
& SP 3712TC
-Level of Use 3gp r %g xgy *ney;gyr Rev.0 General '9 r 1 47 of 69 4
4.21.8 CLOSE breaker. i N N : SToP WARNING sTop j Keeps hands clear of operating mechanism while tripping breaker. Failure to do so will result in serious injuries. 4.21.9 Slowly TUl(N handwhcci clockwise until slack is taken out of trip armature travel as evidenced by trip linkage contacting trip armature set screw and COUNT number of turns to nearest half turn. 4.21.!0 :(EcoltD number of turns on Maint. Form 3712TC-1. 4.21.11 IE trip armature travel is not 1 to 3 turns. us 3 one or both of the following options; ADJUST armature travel as shown in Figure 23.
- a. OPTION "A"
- 1) OPEN brcaker.
- 2) VElllFY charging springs are in "DIScilGD" position.
- 3) LOOSEN trip coil mounting bolts and MOVE trip coil support.
- 4) TIGIITEN trip coil mounting bolts.
- 5) Go To step 4.21.8.
- b. OPTION "II"
- 1) OPEN breaker.
- 2) LOOSEN socket set screw.
- 3) ADJUST trip armature set screw as necessary to achieve
. proper measurement.
- 4) TIGliTEN socket set screw.
- 5) Go htcp 4.21.8.
SP 3712TC Level of Use
sToV 1THNic ;AcT: ' REVIEW 1(cv. O General - -
u of69
4.21.12 CONTINUli to turn handwheel uockwise until breater trips. 4.21.13 Vilitil;Y trip armature ovuttavel as follows:
- a. CONTINUli to turn handwheel clockwise.
- b. IE handwheci can turn at least one-half additional turn before trip arruature Inotion is stopped by top of coil housing acceptance criteria is inet,IlliCOllD results of trip armature overtravel on hiaint.1 orm 3712TC-1.
- c. IE trip armature overtravel is not satisfactory Oo 'Ib step 4.21.11.
4.21.14 RiihiOVII trip armature measuring tool and VlilllFY trip armature set screw is tight. 4.22 Trip and Itelease 1,atch Wipe NOTE Trip latch roller location is shown on Attachment 3. Release latch roller location is shown in 1;igure 25. 4.22.1 INSI'l!CT both rollers for clearly defined imprint in grease. 4.22.2 IE imprint in grease is not clearly defined on both rollers, PliRFORM the following:
- a. APPIX a thin layer of grease on both rollers,
- b. Cl.OSli breaker.
- c. OPliN breaker.
SP 3712TC Lovel of Use sTop THiNx Act- REVIEW Rev.0 Oneral _ 49 0f 69
Mf W met'oehurs i , 4.22.3 hillASUltIIlength of imprint made in grease on trip and release rollers as shown in Figure 24 and OllTAIN both trip and release latch wipes. Figure - 24 Trip and Release Latch Wim atrwc cnmn.a N _. '5.E9E'fM._ .y /
/ \_ m . -, ,,~-
'a'm *(
ingpgagig.t _i 4.22,4 1(EcoltD trip and release latch wipe data on Maint. Form 3712TC- 1. 4.22.5 LE trip latch wipe is not 3/16t o 1/4 inch, PliitFollM the following:
- a. CONSU17 FLS for further recommendations,
- b. .WLIEN corrective action complete, Go % ste;' 4.22.2.
SP 3712TC Level of Use .. STOP' ' THINK ACT REVIEW Itev,0 eneral > 50 of 69
j ._ y l i , 4.22.6 IE release latch wipe is not 3/is to 1/4 inch, PERFORM the
, following as shown in Figure 25:
Figuro - 25 I , Release Latch Roller I e 1
/
suuant tAlcw ,,
"*"" ~. O ( :
~
i - l ADM51WQ$E19at %
- acen ~
4 k_ _ c 9 1 , . d{l Oh j p._._ % U y DP i . (Q , { \
- a. LOOSEN locknut.
j b. ADJUST set bolt. i c. TIOlITEN iocknut. I d. APPIX GE D6A15A1 grease (red) or Mobil 28 grease (red) i
. as necessary to release latch roller and ENSURE entire i
surface is covered with a thin film.
- i
\ ! c. CLEAN surface of release latch. l f. SLOW-CLOSE breaker. l g. OPEN breaker. l I h. MEASURE release latch wipe. I 1) IE release latch wipe is 3/ 1s to 1/4 inch, RECORD on Maint. Form 3712TC- 1. l-l' 2) lE release latch wipe is not 3/1s to 1/4 inch, REPEAT i step 4,22.6. 8 37l2TC Level of Use gags yggg: gap nevjevy g General . Si of e
,en -ens,,-c e e--s,r,w .e+---w-a-,- .,w,+m,,-w,+.,nwnn m aa.,---- ~,,=w.v.,.e--,,--,w -,<,,---mm--m- nn.- <w,..-,.w-r-e -e r v wrrw e- rw- er m s s m-, ,,ww--*
,= 4.23 'IYlp Call Pick-up Voltage 'thst 4.23.1 CONNECT a variable DC source to trip coilleads at Pin 10 of secondary coupler and 4C of auxiliary switch as shown in Figure 26. Figure - 20 Stationary Aux Switch and Secondary Coupler
~
_jTADONARY AUX SWITCH t 6 s t j
@@ @ @ r- _%
rc w se ic PIN NUMDER OCCO /'
@ @ @ @ ooog
@ @ @s @ 0000
= = a N DooQ e
@ e 4 e
""a"" _Etc.ONDARY cg1PLQL 4.23.2 CONNECT a voltmeter to output of variable DC source.
4.23.3 CLOSE breaker. 4.23.4 CYCLE variable DC source "ON" and "OFF" and gradually INCREASE rhcostat setting between jogs until breaker trips open. 4.23.5 RECORD as found trip coil pickup voltage on Maint. Form 3712TC-1. 4.23.6 IE reading is s 70 volts DC, RECORD as left on Maint. Form 3712TC-1. 4.23.7 1E trip coil actuated at a voltage greater than 70 volts DC, OBSERVE trip linkage for binding and PERFORM one or both of the following:
- a. ADJUST trip coil position as f(.llows:
1)- MARK position of trip coil mounting bracket. 1 SP 3712TC Level of Use 'sToV "ThlNE SCTJ ' REViEV[ Rev 0 General , .
.n 52 0f 69 4
4 4 j r
- 2) LOOS 11N trip coil support bracket mounting bolts and i ROTATE trip coil to a different position. ,
l
- 3) REPEAT steps 4.23.1 through 4.23.4.
l b. LUllRICNTE trip latch assembly as follows:
- 1) VERIFY breaker is open. !
i
- 2) Using D50lil5 grease (clear), LUllRICATl! trip latch j assembly, i
- 3) CLOSE breaker.
4 . l
- 4) REPEAT step 4.23.4.
4.23.h IE adjustment DE lubrication was r equired, Refer To Section 4.21 . ! and VERIFY trip armature travel and overtrave' 4.24 lireaker Assembly l-l C A UTIO N Y I Do not apply grease or lubricant to arcing contacts under any - circumstances. 4.24.1 APplX GE D6A15Al grense (red) or Mebil 28 grease (red) to main contacts on all phases, 4.24.2- IIACK OFF support bolts of top and lower support clamp bolt of , bottom as far out as possible. 4 4.24.3 INSTALL arc chute as follows:
- a. POSITION grappling hooks on are chute lifting bolts.
! b. RAISE are chute. I . c, PIACE lifting hoist into position. - d. INSTALL arc chute onto breaker. I c. Simultaneously TILT arc chute forward and LOWER arc chute until it is fully scated on top support bolts.
" SP 3712TC Level of Use 37 ape THtNx" t;ACf REVIEW Rev. 0 General -
- 53 0f 69
.W-e. % w w eamme.*lme,emezMM-49'WGW4"#4"N"EN OM *E' "Nd'*64+MN ----NW NOTE Arc chute should be seated so that metal plate on bottom of are chute is butted up against face of metal seat,instead of on top of it.
- f. Visually OllSliitVl! seating of bottom of are chute.
- 1) 1E metal plate on bottom of are chute is resting on top of metal seat. carefully PUI.L bottom of are chute away from breaker until plate drops down.
- 2) MOVII are chute into breater so metal plate on bottom l of are chute is butted up against face of metal seat.
l l g. IllIMOVII grappling hooks from are chute,
- h. TIGilTliN 2 top and I lower support bolts.
4.24.4 IlliPl!NT step 4.24.3 and INSTAL.L remaining are chutes. SP 3712Tc Level of Use STOP THINK ACT REVIEW Ilev. O eneral 54 of 69
NOTE The io'lewing step is required if scraping has occurred. This is indicated by checking officquurd box on maintenance forrn as a result of step 4.2.10.a. 4.24.5 E scraping has been observed on are chute pins, PERFORhi the following: NOTE lilocking device (s) must be installed while slow-closing breaker,
- a. Simultaneously SLOW-CLOSE breal.cr and, using a mirror, hiONITOR arcing contacts on all phases to determine if contact comes in contact with pins of upper are runner assembly as shown in Figure 27.
Figure - 27 Upper Arc Runnet Assembly UFTING 00LTS - f / f g . lr ,
/ rT + T-
.l ai -
- 1 . /
PINS % j/ PINS K jQ
\ i q :
I . 3 l m N f u,. j
\
[3ek thi
- b. IE there is no contact, RECORD on hiaint. Form 3712TC-1.
- c. E arcing contact on any phase hits a pin, PERFORh1 the following:
- 1) TRIP breaker, i
SP 3712TC Level of Use i STO'PM 6THINK" ACT2 ^ "f5EVIEY[ Rev. O General ' 55 0r 69
j ,
- 2) Refer To step 4.2.5 and REMOVE applicable arc -
j chute (s). f i i 3) SLIDE pipe over top end of contact that is hitting and BEND arcing contact until proper alignment is achieved. j f 4) Refer To step 4.24.3 and INSTALL are chute (s) and ;
} REPEAT step 4.24.5 until all three phases arc ;
i satisfactory. i
; d. TRIP breaker open. !
- 4.24.6 REMOVE arc chute lifting hoist. i 4.24.7 Visually INSPECT breaker to ensure no foreign material or tools i have been left inside. !
l ' 4.24.8 INSTALL box barrier (s) and SECURE. i 1 NOTC Do not indiscriminately spray solvents into operating mechanism to remove dirt. The solvent may penetrate into areas that can not be lubricated unless breaker is completely disassembled. j- 4.24.9 REMOVE grease from trip latch and release latch rollers. t-9 i 1 1 I ! i I 1 4 SP 3712TC l - Level of Use v,qqr *isiNK*' 4lA.cF 'nEvisv/ Rev.0 General P" ?% / \ 4 56 of 69 1
,-c,-- -v.,,,--,---n-, . . . . - . - - - - - , - , . , , - - . . , - - - ..-,---,--,--,---,-v-+..-- , - - , - - - , , . . ~ ~ ~ . ,
4 C A UTIO N Y . GE D6A15A1 and hiobil 28 are red greases and GE D50lil5 is a clear grease. Do not mix red grease with clear grease. This may cause mechanical failure. 4.24.10 Refer to Attachment 4 and LUBRICATE the following with GE D50lil5 grease (clear), GE D6A15Al grease (red) or hiobil 28 grease (red):
- Cam follower roller
- Trip latch roller
- Release latch roller
- Rollers on trip latch
- Roller ramp
- Prop
- Breaker whccis 4.24.11 With GE D6A15Al grease (red) or hiobil 28 grease (red),
LUBRICATE the following:
- Breaker ground bus Primary bushings
- Secondary coupler pins 4.24.12 VERIFY breaker is open.
4.25 Plunger Interlock Ileight Measurement 4.25.1 1E plunger interlock measurement device is not available, PERFORh1 the following:
- a. CLOSE breaker.
SP 3712TC Level of Use c 3 og : "THINK neviEW
~ l'AcT Rev.0 General 57 of 69
8 . 4 4 , b. Using a framing square and level, hiEASURE vertical
- distance from top of plunger bolt to bottom of breaker lifting rail,
- c. E measurement is 117/ 32 to 11 11/ 32 inch, RECORD on hiaint. Form 3712TC- 1.
- d. E clearance is not 117/32 to 11 11/ 32 i nch, PERFORhi the following:
- 1) OPEN breaker.
I l NOTE I The flat surface of the clip which comes in contact with the roller should be level.
- 2) Visually INSPECT plunger interlock clip and DETERhilNE if ci p is bent.
- 3) E clip is not bent, ADD or REh10VE washers to achieve proper clearance.
- 4) E clip is bent AND a new clip is available, REPLACE clip.
- 5) E ncw clip is not available, PRY breaker plunger assembly into horizontal position.
- 6) REPEAT Section 4.25, 4.25.2 REhiOVE closing spring blocking device.
4.25 3 OPEN breaker. 4.26 MeggerTesting 4.26.1 LABEL and DISCONNECT charging motor leads from terminal board. 4.26.2 RECORD on hiaint. Form 3712TC-1. SP 3712TC Level of Use e sToe' ' fHINK' 'ACTI REVIEW Rev. 0 General 58 of 69
4.26.3 MEGGER insulation resistance of secondary circuits from breaker frame to all pins on secondary coupler t.t 250 volts.
- a. IE all readings are greater than or equal to 100 megohms, RECORD on Maint. Form 3712TC-1. -
l b. LE secondary insulation resistance reading is less than 100 megohms, CONSULT FLS for corrective action. l 4.26.4 CONNECT charging motor leads and RECORD on Maint. Form l 3712TC-1. 4.27 Operational Check 4.27.1 INSTALL cover platc. 4.27.2 VERIFY test station breaker open. 4.27.3 - CONNECT test station to breaker secondary coupler. Y CAUTION Y Operatin.; breaker electrically with ratchet wrench on eccentric will destroy charging motor. 4.27.4 VERIFY ratchet wrench used for manual operation is removed. 4.27.5 PLACE test station breaker "ON," 4.27.6 VERIFY breaker -harges. SP 3712TC Level of Use
' shoV 'THINk" ~ CT' REVIEW Rev.0 General y4 ; - 1 , 59 or 69 j
^
i
\
. 4.27.7 OPERATE breaker electrically and INSPECT for tl e following:
- Abnormal sounds, e Urcaker charges properly.
4
- Breaker closes and opens correctly. ,
i l + i
- Dreaker trips freely.
* "CllOD" or "DISCllOD" indicator operates correctly.
* "OPEN" or "C1.OSE" indicator operates correctly.
- -* Operation counter advances properly.
? 4.27.8 E breaker does not operate properly OR any abnormal sounds .
- 3) are heard, PERFORM the following: ,
4-l l. V CAUTION Y ^ Only minor adjustments are allowed to be performed. ]
- 1
- a. E minor adjustments can be made, CORRECT problem,
- b. E repairs are required, CONSULT FLS. .
- c. Go To step 4.27.7 and RETEST breaker as necessary, L
j d. RECORD any repairs or adjustments in comment section on
- Maint. Form 3712TC-1.
! 4.27.9 RECORD on Maint. Form 3712TC-1. i 4.27.10 CLOSE breaker. i , - 4.27.11 PLACE test station breaker"OFH" t i i-4.27,12- DISCONNECT breaker from test station. 4.27.13 E installed, REMOVE protective covers from bushings. 4.27.14 Using an ohmmeter, VERIFY all phases are closed.
. s SP 3712TC Level of Use-g ssioF MHNK' $ACT F "REVIEY/ Rev. 0 General x >
$ !" J % 60 0f 69 1_ =
4 . I 4.27.15 INSERT breaker into cubicle and OllSERVil breaker has opened and springs have discharged.
- a. IE satinfactory, RECORD on hiaint. Form 3712TC- 1.
C A UTI O N Do not put breaker back into cubicle until this problem has been corrected. I
- b. 1E breaker did not trip, PERFORhi the following steps:
- 1) Visually OllSERVE that discharge crank is riding on discharge plate.
4 2) hianually OPEN breaker.
- 3) REhiOVE breaker from cubicle.
- 4) IE adjustments are required, CORRECT problem as 4
necessary.
- 5) lE repairs are required, CONSULT FLS.
- 6) CLOSE breaker.
l 7) REPEAT step 4.27.15 until breaker trips satisfactorily. 4.27.16 REhiOVF breaker from cubicle and OllSERVE any cables or l wires which might need to be retrained to keep from snagging on i breaker. .
- IE any wires or cables snag on breaker, hiOVE as necessary.
. 4.27.17 Using an ohmmeter, VERIFY all phases of breaker are open. 4.27.18 PIACE a tested sticker with date, work order number, and initials on breaker operating mechanism cover plate. 4.27.19 INSTALL breaker into cubicle. 4.27.20 1E necessary, NOTIFY Generation Test Services Department to Ill-pot breaker. 5 - SP 3712TC Level of Use %NF @CT S ' REVIEW Rev. 0 General sTo f
~"
r x - e 61 or 69
. . - - , ,----n --. . , , - , , , . . . = . . . - - - , , . . , . _ , - . , . . , - , , . , , , , , - . - . . , - - - . . . , . , , - - . . . , . _ - - . - . , , - - - , , , - - - , -
+
4.28 Opening Spring Safety lilocking Device Removal
. NOTE-This section is used when the breaker is inadecnendy opened with the blocking device installed, l
4.28.1 PLACE screwdriver or equivalent onto position where prop
- spring connects to prop.
) 4.28.2 Using screwdriver, PUSil prop until mechanism resets. i
- j. a. E mechanism does not reset, PERFORM the following:
1
- 1) Using manual charging wrench, CIIARGE breaker until springs are in the "CliGD" position,
- 2) REPEAT Sectior. 4.28.
4 4.28.3 E springs are not in the "ClIGD" position, manually CIIARGE breaker. , 4.28.4 PRESS manual"CLOSE" button, i f 4.28.5 Using manual charging ratchet wrench, CONTINUE to manually 1 close breaker. 4.28.6 REMOVE opening spring safety blocking device. 4.28.7 POSITION becaker as required. d i i S l s.
- SP 3712TC
- - Level of Use isroF 'THINk' - ACN REVIEW Rev. 0 General -
62 0f 69 l l
r .
- 5. REVIEW AND SIGNOFF The review and signoff for this procedure is satisfied by *he review and signoff of the AWO.-
- 6. REFERENCES 6.1- Technical Specifications, Millstone Nuclear Power Station, Unit No. 3, .
Section 4.8.4.1,b, Containment Penetration Conductor Overcurtent Protective Devices 6.2- NUSCO drawing 252'2-30111 sheet 1," Technical Specifications Surveillance Table" (S&W drawing EE-001DA) 6.3 OPS Form 3273 - 3/4.3.8.4.1," Electrical Equipment Protective Devices, Containment Penetration Conductor Overcurrent Protective Devices" 6.4 gel-88763E, "Magna-Blast Circuit Breaker" (0.1.M._010). 6.5 NMAC " Circuit Breaker Maintenance" NP-7410 Volume 2 Part 2 6.6 IN 90-41 " Potential Failure of General Electric Magna-Blast Circuit breakers and AK Circuit Breakers" 6.7 Engineering Letter MP #-91-042 4160 VAC Breaker SB-12 Auxiliary Switch Contact Resistance 6.8 Installation and Service Engineering Service Advice Letter SAL O73(SPD) 313.1 6.9 - Installation and Service Engineering Service Advice Letter SAL 073(SBD) 325.1 6.10 PIR 3-92-126, Broken upper prop spring found in "B" EDO output , breaker during PM's
- 6.11 NRC Information Notice 94-02,"Inoperability of General Electric Magne-Blast Breaker Because of Misalignment of Close-Latch Spring" 6.12 NRC Information Notice. 95-22," Hardened or Contaminated Lubricants Cause Metal-Clad Circuit Breaker Fa: lures" 6.13 NU Memo MPl-TS-95-440, from Stephen Keefe, Millstone Unit One Technical Support Engineering, "Waterford 3 Switchgcar Fire Information and Chronology" Level of Use 'sT_oP * "THiRP ' cTV " leiliev/ Rev. 0 G6neral , , 7 9 D ,
63 of 69
- 7.
SUMMARY
OF CilANGES 7.1 This procedure was developed using material contained in MP 3784AA, "6,900 Volt Breaker 18 month PM." 7.2 This procedure was developed to convert non surveillance maintenance procedures identified for meeting Tech Spec requirements into a surveillance procedure (ACR M3-97-0029) I l SP 3712TC Level of Use STOP THINK ACT REVIEW Rev.O General 64 of 69
- . Attachment 1 Dicharge Crank Pin and Secondary Coupler (Sheet 1 of 1)
SECONDARY COUPLER f / l t l l bbbbb l I
- 0 <
N DISCHARGE CRANK PIN ix i
'o %
O _/[ O o k
) '1
, u
-_ r, -
t ___ Db p
~
. U --
SP 3712TC Level of Use '<shoF 'YHI E M@ "REViEd eneral - 65 of 69
; Attachment 2 '
i r
- Plunger Interlock Clip Location (Sheet 1 of I)-
NOTE: BREAKER SHOWN IN THE OPEN POSITION l l 1 ,= a l! i: nll l - ll t - y . s l
=, Vo PLUNGER INTERLOCK LA.1 _ -
N '
-- CLIP A(
\\
.\,
O 9 i Oo -,O f . o o A s x ') r, ' fdb bh o -l q u ge t - t Level Of Use "sTo## "tHINW (ACN 'REVIEvf Rev, O Generai , ., , t'4 66 0f 69
J Attachment 3 i ML-13 Operating Mechanism Assembly (Sheet I of 1) Y Y OPEN!CLOSE INDICATOR LINVAGE 9Qi' f c'
$4l ~ .-
SNAP RINGS SNAP RINGS BUSHINGS g l BREAKER FRAME
- . SPACERS PROP PIN - - -
N PROP PIN N. CAM FOLLOWER ROLLER (BEARING) 1
~ .
~
N TRIP LATCH ROLLER y - - 3 (BEARING) L i __ _ - ROLLERS ON TRIP LATCH 3 } --
- i 2
~ '
TRIP LATCH MECHANISM
- TR1P LATCH
- /
e S . , SP 3712TC Level of Use 'STOP - THINK ACT ' REVIEW Rev. 0 General 67 Or 69
Attachment 4 Recoininended Lubrication Points (Sheet 1 of 1) w w NOTE: ALL OF THE COMPONENTS ON THIS ATTACHMENT ARE TO BE GREASED WITH G E. D50H15 GREASE (CLEAR) ., OR SHELL ALVANIA 1 PROP PIN g LUBE SURFACE g . x
, s 4
% N CAM FOLLOWER ROLLER s
\ 5 (UBE SURF ACE RaLER WP .#*
LUBE SURFACE
'\ -
- TRtP LATCH ROLLER q g LUBE SURFACE N _ N
\
ROLLERS ON 1RLP LATCH .-'"i~ s , LUBE SURFACE - - l - k !E 5 L s L tam BOTH PROPS MUST BE LUBRICATED FR E 8NG T SHOWING PROP i / y J m
--mc _ o j a
U a O o T w (
] udN t 7 M -"
T "' i - y 2000h u 9gy SP 3712TC Level of Use cSTOP? THINK L5CF FfEViEY/ Rev.0
' General 68 of 69
/
i I Attachm.ent 5 .
~
1 Prop Pin Adjustment Diagram , (Sheet 1 of 1) i
/ OUTBOARD CRANKS /
j -*
/ /
r
/ /
/ /
/ /
CENTER CRANK /
/
f/ w w w w N j *
/
vsssss sssssssi r,s s s s s s s s ss n Is s,s s s s s s
~
LOWER 7 .__ CLAMP BOLT
;' ]
l _ L__ _ _d : SOUARE SHAFT i l i 1' I l l l l CLAMP BOLTS
~ "
ll l l # 11 11 0
~
II II I u
=
BREAKER FRAME PROP PIN -- _
" ~ -
-- PROP PIN PROP PIN TO FRAME
% BUSHWGS F PROP PIN TO FRAME I. * =
Ct.EARANCE
- 1 CLEARANCE 20.025 INCH I 10.025 INCH v W SP 3712TC Level of Use egg -fge m g- jg g, g ,
General u
. % 69 of 69 i
- t. -- .
6.9 KV Containment Panctration Brcakcr PM l SU.]VEILLANCE COVER SHEET gO FmW APPOVED DAfE / p PAGE nettaENcESPEc. g HUERENCE POCEDURE PORC % NO. s/, 4R41b sc-cDaE DATE SP 3712TC Af n APPUCABLE MODE FREOdENCY / 1 1,2. 3. and 4 60 months Test avismnD DV (SMUS) DA!E C#LETED tY DATE AccEFTED BV (DEPT FLS) DATE YES AP=40VED BY fDEPARTMENT HEA!!OESiONEE) DATE NO TECH SPEC MAINTENANCE SYSTEM NON-TECH SPEC SURVEILLANCE RESTORATION ALIGNMENT SURVEILLANCE ISI TESTING TEST EO,UIPMENT OA NilMBER CAL DUE DATE l Test Equipment information is included in AWO for performing surveillance. ACCEPTANCE CRITERIA
- 1. Manufacturer's recommended PM's and inspections have been completed for Breaker IN ACCORDANCE WITH REFERENCE PROCEDURE INmALS
- 1. PREREQUISITES / INITIAL CONDITIONS COMPLETED
- 2. PRECAUTIONS NOTED 3.
COMMENTS: (IF MAINTENANCE RESTORATION. INDICATE BELOW WORK ORDER #. ETC.) SHIFT MANAGER NOTIFIED OF FAILED SURVEILLANCE INITIALS
~~ ~-- , -
.t . l DATA t ,, ,' . ') , 0(g,jJ i-
' 4%_L) itO q See pages 2 through 10 of this form. Il
- for 'n:ormation Or .
y" STOP THINK ACT Maint. Form 3712TC-1 REVIEW Rev.0
6.9 KV Containment Penetration Breaker PM STEP 4.1.2 SECTION "A" DATE: / / WORK ORDER NO: M3- - LOCAL ID OF BREAKER: LOCAL ID OF EQPT SUPDLIED: BREAKER SERIAL NO: BKR OPERATIONS: NOTE: Any step in which the results or measurements were found to be unacceptable, place a check in the "SEE CMNTS" box and provide an explaination in the comment section of this form. STEP (S) FUNCTION PERFORMED cEn'rs INITIALS 4.2.9 ARC CHUTE CERAMIC FINS Q 4.2.10 ARC CHUTE PIN INSPECTION Q 4.2.11.a. ARC CHUTE PLASTlSOL FLEXIBLE COVERING Q 4.3.3.a. PRIMARY BUSHINGS Q 4.4.11 GENERAL INSPECTION OF BREAKER Q 4.4.12.0. CHARGING MOTOR BRUSH INSPECTION Q 4.4,13 POSITIVE INTERLOCK ROLLER ADJUSTING BOLT Q 4.4.14 POSITIVE INTERLOCK ROLLER MOVEMENT INSPECTION O 4.4.15 STATIONARY AUX SWITCH MOUNTING BOLTS Q 4.5.5 DRIVING AND LATCHING PAWLS INSPECTION Q CHECK BOX IF NO ADJUSTMENTS MADE Q 4.6.8 DRIVING PAWL ADJUSTMENT Q 4.6.12 LATCHING PAWL ADJUSTMENT Q Maint. Form 3712TC-1 > STOP THINK ' iACT' REVIEW Rev. O Page 2 of 10 j
a' ' . s 6.9 KV Containm::nt Penetration Brcaker PM g STEP (S) Release Latch Monitoring Switch Lead 4.7.1.a. Lead from release latch monitoring switch lifted: (whais) (venrica) 4.7.1.k. Lead from release latch monitoring switch landed: (wn.i.) (vonnoo) FUNCTION PERFORMED l STEP (S) Accggce e gee , RELEASE LATCH MONITORING SWITCH: 4.7.1.c. Switen Resistance: As Found As Left 1 OHM OR LESS Q 4.7.1.1. Switch Wipe: As Found As Left s 0.031 INCH Q 4.7,1.0. Release Latch Monitoring Spring Coils Not Catching Q INTERLOCK SWITCHES: 4.7.2.b. Switch 1 Resistance: As Found As Left 1 OHM OR LESS Q 4.7.2.b. Switch 2 Resistance: As Found As Left 1 OHM OR LESS Q 4.7.2.1. Switch Wips: As Found As Left s 0.031 INCH Q
, LATCH CHECK SWITCH:
4.7.3.e. Switch Resistance: As Found As Left 1 OHM OR LESS Q 4.7.4.e./h. Switch Arm To Switch Support: As Found As Left .2. 0.016 INCH Q TRIP LATCH GAP: 4.7.4.d./h. Trip Latch To Stop Pin: As Found As Left 0.058 to 0.068 INCH Q Trip Latch To 4.7.4.k. Latch Roller: As Found As Left 0.031 to 0.063 INCH Q POWER SWITCHES: 4.7.5.b. Switch 1 Resistance: As Found As Left 1 OHM OR LESS Q 4.7.5.b. Switch 2 Resistance: As Found As Left 1 OHM OR LESS Q 4.7.5.e. Switch Wipe: As Found As Left s 0.031 INCH Q 4.7.5.i./k. Switch 3 Resistance: As Found As Left 1 OHM OR LESS Q Maint. Form 3712TC-1 ISTO'P! ' THINK ACT ' REVIEW' Rev. 0
. Pagc 3 of 10
, 6.9 KV Containment Ponstration Brcaker PM
..J STEP (S) FUNCTION PERFORMED
- cMhs INITIALS 4.8.4 STRICKER PLATE INSPECTION O 1 4.9.3 MAIN CONTACTS INSPECTION Q 4.0.6 ARC CONTACTS INSPECTION Q 4.10.4 FLEX BRAIDS INSPECTION Q FUNCTION PERFORMED AC ^"
STEP (S) CR RA cbYTs INITIALS s stance: As Found As Left
. . s O 4.12.2 Trip Coil Resistance: As Found As Left 18.9 to 23,1 ohms O STEP (S) FUNCTION PERFORMED cb$s INITIALS 4.13.2.a. RELEASE LATCH ROLLER INSPECTION Q e 4.13.3.a. RELEASE LATCH ROLLER MOVEMENT INSPECTION Q STEP (S) FUNCTION PERFORMED cbYTs INITIALS 4.14.2.f. ML-13 ROLLER INSPECTIONS Q 4.14.3 ML-13 HARDWARE INSPECTION O 4.14.7 PROP SPRING WASHER MOVEMENT INSPECTION Q FUNCTION PERFORMED AC ^"
STEP (S) CR RA chYTs INITIALS 4.15.2 Prop Pin Clearance As Found As Left 2 0.025 inches O STEP (S) FUNCTION PERFORMED cbYTs INITIALS 4.16.1.a. PROP PIN HARDWARE MOVEMENT INSPECTION O 4.16.2.a. PROP PIN WASHER AND SNAP RING INSPECTION Q Maint. Form 3712TC- 1 STOP THINK ACT~ REVIEW Rev.O Page 4 of 10
a 6.9 KV Containmtnt Pan';tration Brcaker PM ed STATIONARY TO MOVEABLE ARCING CONTACT MEASUREMENT "A" STEP (S) FUNCTION PERFORMED Accggggce
- e curfTs INITIALS AS FOUND:
PHASE *A" '* 4.17.5 PHASE *B" 8Nea 21.0 INCH O PHASE *C" 'NCH AS LEFT: 4.17.6 PHASE *N 'Nc" PHASE "B" 'NCH 21.0 INCH Q PHASE *C" INCH SAME AS AS FOUND g l STATIONARY TO MOVEABLE PRIMARY CONTACT MEASUREMENT "B" STEP (S) FUNCTION PERFORMED AC C 5$I#"M ' SEE INITIALS C a AS FOUND: PHASE'A' 'e 4.17.13 PHASE *B" inch 2 5/16 INCH O j PHASE"C" '* AS LEFT: 4.17.15 PHASE *A* INCH l PHASE"B* INCH 2 5/16 INCH Q PHASE'C" 'Nc" SAME AS AS FOUND STEP (S) FUNCTION PERFORMED AC ^" CR A cbNTS INITIALS PROP TO PROP PIN MEASUREMENT 4.17.22 LEFT SIDE: As Found As Left 0.063 to 0.156 inches O RIGHTSIDE: As Found As Left F Maint. Form 3712TC-1 l STOP THINK ' 'ACT ' REVIEW Rev. O Page 5 of 10
t' ,
, 6.9 KV Containm:nt Pcn:;tration Brcakcr PM PRIMARY CONTACT WIPE PHASE "A" STEP (S; FUNCTION PERFORMED Ac c b b ' c s INITIALS AS FOUND:
4.18.3 "C" DIMENSION: INCH 4.18.6 '*
"D" OlMENSION:
CONTACT WIPE: INCH 21/4 to 5 5/16 INCH AS LEFT:
"C" DIMENSION: '*
4.18.3 "D" DIMENSION: '* 4.18.8.k. CONTACT WIPE: INCH A 1/41015/16 INCH h l SAME AS AS FOUND PHASE "B" AS FOUND: l 4.18.3 "C" DIMENSION: '* l 4.18.6 'NC" ao OlMENSION:
^ '
CONTACT WIPE: 'Nc" 21/4 toi5/16 INCH AS LEFT: 4.18.3 "C" DIMENSION: '*
"D" DIMENSION: '*
4.18.8.k. CONTACT WIPE: 'e 21/4 to15/16 INCH h SAME AS AS FOUND g PH ASE "C" F AS FOUND: 4.18.3 "C" DIMENSION: 'NcH 4.18.6 *D" DIMENSION: INCH 4.18.7 CONTACT WIPE: 'Nc" 21/41015/16 INCH AS LEFT: 4.18.3 "C" DIMENSION: 'e "D" DIMENSION: 'NC" 4.18.8.k. CONTACT WIPE: INCH 21/4 to15/16 INCH h SAME AS AS FOUND ] Maint. Form 3712TC- 1 STOP ~ THIN K ' ACT' REVIEW Rev. O Page 6 of 10
4 6.9 KV Centainm:nt Pcn;tration Brcak:r PM Lg) e BUFFER BLOCK CLEARANCE MEASUREMENT STEP (S) FUNCTION PERFORMED Acc EN$"A INITIALS CM 3 j AS FOUND: PHASE *N *c" 4.19.3 PHASE *B" mcH 2 0.063 inches O PHASE"C" '*" 4 i AS LEFT: PHASE *N *c" 4.19.4.i. PHASE *B" '*H 2 0.063 inches Q PHASE *C" 'Nc" SAME AS ' AS FOUND g a PRIMARY CONTACT GAP MEASUREMENT STEP (S) FUNCTION PERFORMED AcINN c CM$s INITIALS AS FOUND: PHASE *A" ac" 4.20.2 PHASE *B" mcH 51/a to 5 9/is INCH O PHASE"C" *c" i
- AS LEFT
PHASE"# *c" 4.20.3.1. PHASE *B" '** 51/8 to 5 8/isINCH O PHASE *C" *C" SAME AS AS FOUND g ~
~
Maint. Form 3712TC-1 STOP THINK ACT REVIEW Rev.O Page 7 of 10 Y
6.9 KV Centainm::nt P0nstration Brcak;r PM
, l
- .) TRIP ARMATURETRAVEL STEP (S) FUNCTION PERFORMED ACCgplgNCE e
E IMTES 4.21.10 AS FOUND: NUMBER OF TURNS: 1 to 3 TURNS Q AS LEFT: NUMBER OF TURNS: 1 to 3 TURNS Q SAME AS
- AS FOUND g i
TRIP ARMATURE OVERTRAVEL STEP (S) FUNCTION PERFORMED ACCjglA e CE C rTS INITIALS 4.21.13.b. AS FOUND: NUMBER OF TURNS: A 1/2 TURNS Q i AS LEFT: 3 NUMBER OF TURNS: 21/2 TURNS Q i SAME AS AS FOUND FUNCTION PERFORMED AC ^" STEP (S) CR RA CfAN1SINITIALS 4.22.4 Trip Latch Wipe: As Found As Left 3/ 16t o 1/4 inches Q ! 4 2 5 h. Release Latch Wipe: As Found As Left 3/ 16t o 1/ 4 inches Q j 4.23.5 Trip Coil Pickup Voltage: 4.23.6
$ 70 VDC Q As Found As Left j
l } 4 Maint. Form 3712TC- 1 STOP' TH NK ACT REVIEW Rev. O PagC 8 of 10
_, 6.9 KV Containm:nt Pcnetration Brcaksr PM
. q, STEP (S) FUNCTION PERFORMED CI[ S INITIALS ARCING CONTACTS TO UPPER ARCING RUNNER:
4.2.10.a. Q 4.24.5.b. Q REOUIRED Q NOTREQUIRED AC STEP (S) FUNCTION PERFORMED CbHTS INITIALS
~
CR Plunger Interlock Height: 4.25.1.c, 7 11 /32 ot 11 11 /3: inch O As Found As Left STEP (S) FUNCTION PERFORMED Cff S INITIALS
- 4.20.1 1st LEAD LABELED AS
2nd LEAD LABELED AS: l 4.2t .2 1st LEAD LIFTED: (Initials) (Venfied) 2nd LEAD LIFTED: g, (Irvtials) (Venfied) 4.26.4 1st LEAD LANDED: (Initials) (Venfied) 2nd LEAD LANDED: (htials) (Venfied) AC 4 STEP (S) FUNCTION PERFORMED CbNTS INITIALS CR A s . 4.26.3.a. INSULATION RESISTANCE TESTING A d 300 g STEP (S) FUNCTION PERFORMED Cb'NTSINITIALS 4.27.9 OPERATIONAL CHECK OF BREAKER O 4.27.15.a. BREAKER TRIP TEST O I i Maint. Form 3712TC- 1 STOP THINK ACT REVIEW Rev. O Page 9 of 10
7, 6.9 KV C ntainm:nt Pcnetrati:n BrcakCr PM
'hN COMMENTS:
l ! ( I ( Maint. Form 3712TC-1 STOP THiNK ACT' ' REVIEW Rev. O Page 10 of 10}}