ML20069F917
| ML20069F917 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/22/1982 |
| From: | GOULD, INC. |
| To: | |
| Shared Package | |
| ML20069F872 | List: |
| References | |
| 2.0.1-2A, NUDOCS 8209280282 | |
| Download: ML20069F917 (8) | |
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Gould I-T-E Molded Case
- O Circuit Breakers Testing and Maintenance Procedures i
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.l.T-E MOLDED CASE CIRCulT BREAKERS TESTING AND MAINTENANCE PROCEDURES e
YOU'LL FIND MANY REASONS dreamed were possible with any tampering, and that the breaker may be FOR CHOOSING I-T.E protective device.
expected to perform according to the MOLDED CASE CIRCUlT BREAKERS The utmost in reliability, based on UL specifications. A broken seal voids I-T E's quality construction-the UL label and jeopardizes the Her2 Ars Just a Few:
quick make, quick-break warranty.
peration, silver alloy contactr, high Maximum protection for equipment and c ntact pressure, extra-wide pole 1 T E molded case c,rcu,t breakers have i
i personntl. Minimum maintenance and spacing, individually calibrated poles on an excellent record of reliability which downtime.
all breakers. These and many other to a great exte11t is due to the enclosed Lower total cost over the many years of design and construction features are design which minimizes tampering and service you'll get from I T E breakers.
checked constantly to meet 1 T-E's exposure to dirt, dust, and other Because they're resettable, take less quality requirements and those of contaminants. This reliability also space, consume less power and prever.t Underwriters' Laboratories, Inc. All of depends on proper installation following single phasing as compared to fusible these measures of dependeable careful application, particularly with devices.
protection are the natural results of reference to the maximum available I-T E's many years of technical short circuit current of the circuit to A selection to meet any need you may leadership in circuit breakers, which the circuit breaker is applied.
havr. From a 4000-ampere systems For testing procedures on GFI and bre:ker to a 15 ampere ground fault Reliability after application also Systems Breakers, consult appropriate depends upon environment and inttrrupter, an instantaneous trip IS-breaker for motor protection, a special maintenance. All devices with moving fire pump breaker, or-the most 1-T E molded case circuit breakers parts require periodic check ups. A demanding of all-breakers to meet U.S.
undergo extensive production testing circuit breaker is no exception. It is not Navy requirements.
and calibration at the factory. These unusual for a circuit breaker to be in tests are based on Underwriters
- service for extended periods and never Capability to do virtually anything you Laboratories, Inc. " Safety Standard for be called upon to carry out its overload want, anywhere you want. With over Branch Circuit and Service Circuit or short-circuit functions. Therefore,it 800 brtakers to choose from, you also Breakers" No. 489. Circuit breakers should be exercised and tested at times have a complete variety of accessories, carrying the UL label have factory to assure proper funct;oning. The auxiliaries, enclosures and mounting sealed calibrated elements; an unbroken procedures outlined in this bulletin are arrangements. You may find you can do seal assures that the mechanism has not accepted methods of testing to verify things with an I-T E breaker you never been subjected to alteration or circuit breaker performance in the field.
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C A U TION
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Molded Case Circuit Breakers must always be completely de-energized, disconnected and isolated before any tests or maintenance are attempted.
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s PERIODIC FIELD TESTING AND MAINTENANCE PROCEDURES r
Qualified, authorized personnel can line and load terminals of each pole of insulation. The most common method perform routine field testing and the unit with the circuit breaker employs a "megger type instrument.
O' maintenance to assure the circuit contacts closed.
Most of such devices in use have outputs breaker is providing proper protection, l-T.E will provide allowable voltage f 500 voltes or less, whereas, much These procedures are based on accepted drop data on request for circuit breakers more reliability will be derived if 1000 practices. Note the caution below under test. It is recommended that this von insuuments are used because they before beginning any tests.
test be made with a de current are more likely to pick up tracked approximating 50 percent of the circuit inw!ation wrfaces. Resinanm values breaker continuous current rating; below one megohm are considered
- 1) Connections Test however, currents for the larger circuit unsafe and should be investigated.
The connections to the circuit breaker breakers may be as low as 50 amperes if An insulation resistance test should be terminals should be inspected to the millivoltmeter is of suf fic,ent made:
i sensitivity he mWivoh drop across determine proper conductor ampacity each pole ;s measured and recorded for
-Between line and load terminals of i
and that proper electrical joints exist. If individual poles with the circuit c mpa s n aga s e data mWed overheating of connections is evident by breaker contacts open.
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discoloration or arcing, the surfaces
-Between adjacent poles and from be practical to compare values with must be cleaned before testing and poles to metallic supporting structure those of poles of other circuit breakers reinstallation. As stated before,it is with the circuit breaker contacts f sin at size and nyk.
essential that electrica! connections be closed. The latter may be done with made properly to prevent overheating.
the circuit breaker in place af ter the Refer to Table #2 on page 7 for
- 4) Overload Tripping Test line and load conductors are recommended torque values. Aluminum This test provides assurance the removed, or with the circuit breaker lug connectors are plated and should overload component of the circuit bolted to a metallic base which not be cleaned with abrasives.
breaker is operating. This is NOT a simulates the in-service mounting.
verification test of 1-T.E's published test data. To perform the test, apply 300%
- 7) Summary
- 2) Mechanical Operation Check of the breaker rating. The breaker it is again emphasized that common Manual mechanical exercising of a should open automatically. This proves maintenance practices for electrical circuit breaker is a recommended the overload component is functioning.
equipment should be adhered to in field procedure. A few operations of the To determine actual tripping testing both new and installed molded handle performed periodically, together characteristics, refer to page 5.
case circuit breakers, and usually the with a careful visual inspection of standard routine operating checks listed terminal connections, for tightness,
- 5) Instantaneous Magnetic Tripping above will be sufficient to assure proper physical damage or evidence of functionmg of the circuit breaker. It is overheating are considered good This test provides assurance that the further recommended that since molded practice. This will keep mechanical instantaneous magnetic component of case circuit breakers have factory sealed linkages free, while the wiping action by the circuit breaker is functioning. This calibrated elements, that THIS SEAL contacts tends to avoid resistance test does NOT determine exact tripping SHOULD NOT BE BROKEN AND THE build-up and thereby minimizes heating.
values. To perform the test, use either CIRCUlT BREAKER ITSELF Circuit breakers applied and specified the Runup or Pulse method described SHOULD NOT BE TAMPERED WITH.
for switching duty do not need regular on page 6.
Adjustment or repair c' molded case exercising.
circuit breakers in *. eld is not
- 6) Insulation Resistance recommended. The orcuit breaker An insulation resistance test is used to should be replaced, or its parts should
- 3) Individual Pole Resistance Test determine the quality of insulation be replaced or repaired at the f actory.
(Millivolt Drop) between adjacent poles of a circuit After performing any of the above tests, The detrimental effect of operating a breaker and from its poles to ground.
be certain to account for all hardware circuit breaker in a manner for which it The resistance test is made with higher and tools and make certain all test was not intended can be detected by de voltage than the rated voltage, to instruments are disconnected before making a millivolt drop test across the determine the actual resistance of the re-energizing the circuit breaker.
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C A U TION Molded Case Circruit Breakers must always be completely de-energized, disconnected and isolated before any tests or main tenance are attempted.
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VERIFICATION TEST PROCEDURES Underwriters Laboratories, Inc.
screw and cable set screw should be conductor in order to reduce heating
StandIrd for Molded Case Circuit properly secured.
and voltage drop.
Breakers and Circuit-Breaker
- 4. Current must be held constant and Other frequently encountered problems Enclosures," UL 489, is the basis for accurately over the erstire test time.
are the inability to uit the required performance standards for all molded The heat generated in the trip unit of time for the circuit b -takers to cont to case circuit breakers bearing the UL a thermal trip circuit breaker is room tamperature and a room libel. Verification of molded case proportional to the sciuare of the temperature other than 25 C (77*F). If circuit breakers to UL test standards is current. A small variation of current tests are made while thermal trip circuit intended to permit the checking of can cause a large variation in total breakers are still warm, the trip time circuit breakers in accordance with heat generated.
will be shorter than if they were allowed published data under carefully Example-if a 10 ampere current (la )
to cool completely. When testing controlled conditions. The published is allowed to change only 10 percent ind.vidual poles, successive tests can be data are based upon the UL standard to 11 amperes (Is), the heat run on adjacent poles,with no and,if verification of these data or generated will be:
cool down periods between tests without application curves is desired from tests, (1 )*
11*
121 resulting in more than a 10 percent error.
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9 the tests should be performed under (1, )2 10 100 The recommended method of 3
carefully controlled conditions as This shows that an increase of 10 determining whether a circuit breaker has been calibrated in accordance with specifically instructed by Gould 1 T-E.
percent in current will cause a 21 Gould I-T E's limits is to meet all of the if circuit breaker performance '
percent variation in heat and a UL specified conditions outlined in this charactzristics are to be tested in the corresponding error in trip time.
field, there are many variables that must NOTE-To get field test results publication.
be recognized and taken into account.
comparable to those obtained wi4en Molded Case Circuit Breaker Trip Some simplifications are necessary; circuit breakers are factory tested to UL Characteristics however, even simplified testing must Standards, ammeters must be carefully Gould I T-E molded case circuit recognize variations that can and do checked to a precise standard. Most breakers employ the inverse time exist between one test setup and panelinstruments are accurate to a 12 element principle as the design basis for another. These variations can account percent of fu// sca/e reading. This means protecting against overloads without for differences in test results, and it that a 500-ampere meter may have an nuisance tripping. With the inverse time must be recognized that a circuit error of i 10 amperes (+ 0.02 X 500 =
element concept, the time between the breaker may furnish adequate 10 amperes). This same 10-ampere error occurrence of an overload and the protection, but appear defective because can exist during measurements at all moment of tripping varies inversely with of the test procedure used.
points on the scale. For example, the the magnitude of the overload current.
Underwriters Laboratories Standards error at 100 amperes or 1/5 scale may Thus, optimum overload protection is Calibration standards and the trip-time still be 10 amperes,i.e.,10 percent.
achieved without nuisance tripping from values for circuit breakers tested in From the previous example, a momentary higher overload currents.
accordance with UL 489 are based on 10-percent change in current can cause a The speed of the breaker's response the following conditions:
21 percent change in heat in the circuit dependson the magnitude of theoverload.
- 1. Circuit breakers are tested in ope,n a.
breaker under test and a corresponding The basic Gould 1-T E thermal magnetic ir at an ambient temperature of 25 C change in trip time. In order to molded case circuit breaker combines (77 F).
minimize this effect, meter scales should the inverse time element or thermal
[,,t be chosen so that readings are taken in action design for low level overloads, a
ea the upper half of the scale.
and instantaneous magnetic action for j
before tests are started, circuit breakers must have been in a 25'C i Testing Limitations short circuits.
3 C (77 F i 5'F) ambient long in field testing it will not be practical to Thermal Overcurrent Trip Test meet all of the test conditions specified When testing molded case circuit enough for all parts to have reached the same temperature (at least 2 by UL Standards. In many cases, NONE breakers in the field,it is recommended hours for circuit breakers rated 100 f the UL standard factory test that the thermal overcurrent tests be amperes and below, and 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for conditions may be fully met.
performed on individual poles at 300%
those rated above 100 amperes).
One of the most frequently encountered of rated current. The reaction of the
- 3. Calibration tests are made with problems is the fact that a circuit circuit breaker to this overload will be conductors of the size specified in breaker may have to be tested in the indicative of its reaction throughout its the UL Standard connected to line enclosure in which it is mounted, rather entire overcurrent tripping range. This and load terminals. If, in field than in open air as specified by UL.
load has been chosen as the test point testing, the circuit breaker is Consequently, the difference in ambient because it is relatively easy to generate connected with wire or bus other temperature will result in trippin9 the required current in the field and the than that specified, results will vary characteristics different from those wattage per pole from line to load is from published riata. The wire should which would be experienced in open air.
large enough so that the dissipation of be connected with the lug Temporary test connections call for heat in the adjacent pole is minor and specifically intended for that extra care with respect to the tightness does not affect the test results breaker, and both the lug mounting of the connections and the size of the appreciably.
C A U TION Molded Case Circuit Breakers must always be completely de-energized, disconnected and isolated before any tests or maintenance are attempted.
9 VERIFICATION TEST RESULTS Test values are based on 300% o' breaker rating on ind'ividual poles at 25*C (77'F) using four feet of copper wire or cable as indicated.
Tripping Time In Seconds O
Bresher Ampere Wire Sire Man. For Frame Rating Per Pole Mmimum Maximum Cable Prot.
EQ 15-20 1- #12 4
45 100 1 Pole 30-50 1-e6 4
45 100 TO If20 1-si2 4
35 100 2,3 Pole 30-40 1- #8 4
35 100 50-100 1-s1 5
45 200 125 1 - e 1/0 10 50 200 BOC 15-20 1-812 4
35 100 30 1-s10 4
35 100 OJ 12f225 1-e470 25 155 300 E
1020 1- #12 8
50 100 3040 1- #8 8
50 100 50-100 1-et 0
50 200 EH,EF,HE 15 20 1-s12 to 50 100 HE 3040 1-88 10 50 100 50-100 1-at 9
75 200 EH 110 150 1-s t /0 25 180 300 70 iDO 1-e1 3d 13d 200 FJ 125-225 1 - #4 /0 35 170 300 JD,JJ 7dTO0 1-#1 50 130 200
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JL,HJ 124225 1-s4/0 40 160 300 250 400 2-#3/0 30 200 300 LL, H L 450 2- #4/0 25 250 300 500 000 2-350 MCM 25 250 350 KM 25d~450 2-a4to 70 250 300 500 600 2-350 MCM 45 250 350 700 400 3-300 MCM 55 280 600 HM 400450 2-s4/0 45 250 300 500-600 2-350 MCM 45 250 350 700E00 3-300 MCM 45 280 600
~ !356~MCM 25 250 350 2
KP, H K 600 700 800 3-300 MCM 25 450 600 900-1200 4-350 MCM 25 450 600 HP 600 2-350 MCM 35 250 350 800-1200 4-350 MCM 35 350 600 1400_-1_600 5-400 MCM 100 400 750 HH 1800 2000 5-600 MCM 170 450 750 HS 2560 F4ddIMCM 25 600 750 3000 9-400 MCM 25 000 750 4000 12-400 MCM 25 600 750 T
15 20 1- #12 5
40 100 CC 30 1- *10 5
_40 100 CE 15Tf0 1-#12 7
35 100 3040 1-s8 7
35 100 50 100 1-#1 9
100 200 CJ 150-225 1- #4/0 45 200 300 250 400 2-m3/0 35 200 300 CM 400 450 2- #4/0 30 280 300 500 000 2-350 MCM 30 280 350
)
700E00 3-300 MCM 70 400 600
'CP 600 2ZMOMCM 35 250 350
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800 1200 4-350 MCM 75 430 600 1400-1600 5-400 MCM 230 550 750 CR 1800-2000 5-600 MCM 260 550 750 EVALUATION OF FIELD TEST RESULTS Minimum Tiipping Times Maximum Tripping Times Maximum Tripping Times For Cable The minimum values shown in the Under normal conditions, the circuit Protection N the test value exceeds the maximum above table should not be considered breaker will trip in less time than the tripping time shown m the above table, significant in field testing unless maximum values shown in the table.
but falls below the maximum tripping nuisance tripping has been experienced.
Under improper test conditions, the time for cable damage, the circuit These values are provided as a guideline maximum values may exceed those breaker is providing an acceptable level only, if minimum tripping times are given in the table.
of protection. Coordination with other lower than those shown in the table, the protective devices shoufd be considered O
breaker shoul be retested after being before replacing a circuit breaker which de-energized and cooled for the required trips beyond the time-current curve.
time.
C A U TION Molded Case Circuit Breakers must always be completely de-energized, disconnectai and isolated before any tests or maintenance are attempted.
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INSTANTANEOUS MAGNETIC OVERCUR R ENT TRIP TEST
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o These tIsts are intended to simulate breaker trips. The recommended Although this method is a more short. circuit conditions, but it must be time for increasing the current is accurate procedure, it is subject to an i remembered that in the field it is between 2 and 5 seconds. If the error introduced by current of fset.
i practictity impossible to impose the current is increased too slowly, Figure #1 depicts the distortion of the 5000 amperes (or more) pulse that is tripping may be due to the time-pulse current, commonly called of f set imposed in the laboratory, delay element, especially if more or asymmetrical.
than one test is run at a high current In routine tests it is more important to level. If the current is increased too determine that the magnetic trip feature rapidly, an erroneous current reading is operating and will trip the circuit may be obtamed because the meter breaker, rather than determmmg the results in an asymmetrical current.
ndication lags behind the actal extet current value at which the Experience with field test equipment current vabe due to meter damping.
mzgnetic trip feature operates. To indicates that tu cffset may be as high duplicate Gould I-T-E's published data, The runup method requires skill on as 20 percent. A circuit breaker can be exact d1 termination of trip current the part of the operator in tripped by the offset peak rather than values een be obtained, but the recognizing the relationship between the steady-state current so the etfect of necessary precise control of test actual current and the meter the error is such that the indicated trip conditions will probably prove indication.
current may be as much as 20 percent impractical. It must be recognized that CAUTION-If the circuit breaker lower than the peak offset current on circuit breakers in the larger frame does not open within 10 seconds, the which tripped the circuit breaker. In siris the instantaneous magnetic loading circuit must be de-energized factory testing, this error is avoided by cvsrcurrsnt trips have adjustable to protect it from damage.
(1) using synchronous closing of the settings, usually from 6 (Lo) to 10 (Hi) current control to make contact at a
- 2. Pulse Af&d-This Mod MI N times the continuous current rating.
point on the 60-hertz wave so that no more accurate than the runup e mmn c n, aM G madng Since the magnetic trip characteristics method if done properly, but it a n va n a cabaW of tha circuit breaker can be influenced requires that the test equipment be imag abbg caMe ray oschscop by stray magnetic fields, the test setup equipped with a pointer-stop r a graph,c recorder.
must be made in such a way that the ammeter or a calibrated image-fields caused by the test equipment retaining oscilloscope. It involves the itself, by steel enclosures, or by the following steps:
conductors to the circuit breaker, do Interpretat. ion of Test Results
- a. After the circuit breaker is not af fect the test results. Results can also be greatly influenced by the wave connected, current is applied in The principal purpose of field testing is shape of the ctarrent and, therefore, it is short pulses of 5 to 10 cycles.
to permit the user to safely determine desirable to have sinusoidal output from
- b. The current is increased on each whether the circuit breaker is furnishing the loading equipment.
succeeding pulse until the circuit the protection for which it is intendd, Testing of the instantaneous magnetic breaker trips.
or whether it should be replaced. Field testing is not intended to determine trip feature may be by the,,runup,,
- c. The current is then reduced to whether the circuit breaker exactly method or the pulse method:
Just below that point and, by meets the published curves. A circuit
- 1. Ranup Afethod-in this method, one repeated pulses, the pointer stop breaker that trips in less than the pola of the circuit breaker to be on the ammeter is adjusted until minimum time shown by the time tzsted is connected to the test the pointer movement is barely current characteristic curves may tquipment, and the current control is perceptible when the current is furnish more protection than is set at a point where approximately pulsed.
expected. System coordination of 70 percent of the expected tripping
- d. The current can then be raised tripping times should be considered currant will flow when energized.
slightly and rechecked at the before replacing a circuit breaker that The power is then turned on and the current at which the circuit trips at a value outside of the current increased until thc circuit breaker trips.
time-current curve.
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CA U TION Afolded Case Circuit Breakers must always be completely de+nergized.
disconnected and isola ted before any tests or maintenance are attempted.
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RECOMMENDED TOROUE VALUES e
Breaker Frame Lug Cat. No. or Wire Range Cable Set Screws Lug Mounting Screws OT
- 14 to #10 AWG. CU (15-30A) 20 in. Ibs.
- 12 to #8 AWG. AL (15-30A) 20 in. Ibs.
p
- 8 AWG. CU; #6 AWG. AL (40A) 35 in. Ibs.
g Load Lugs
- 14 to s8 AWG. CU (15-30A) 20 in. Ibs.
OP, HQ
- 12 to #8 AWG. AL (15-30W 20 in. Ibs.
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l 0, H8 s8 to #1 AWG. CU/AL (46'70A) 50 in. tbs.
3 s4 to 1/0 AWG. CU/AL (90-125A) 50 in. Ibs.
Line Luq BO, HB TCid1 50 in. Ibs.
Load Lug
- 14 to #10 AWG. CU (15TOA) 70 in. Ibs.
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- 12 to #8%WG AL (153uA) 20 in. ibs.
Line Lug
- 14 to #10 AWG. (15-30A) 20 in. Ibs.
25 en. Ibs.
- 12 to #8 AWG (15 30A) 20 in. Ibs.
25 in. Ibs.
OJ T E1 E 00 250 in. Ibs.
96 in. Ibs.
TC1-Q250 250 in. Ibs.
96 in. Ibs.
E, EH, EF, HE, CE TA1-E010 (15-25A) 20 in. Ibs.
TA1-E 100 (30100Al 50 in. Ibs.
55 in. Ibs.
150 Amp EH,150 Arnp EF TA 1-E 150 100 in. Ibs.
50 in. Ibs.
TC1.E150 100 in. Ibs.
50 in. tbs.
f~S FJ T A1.F 300 250 in. Ibs.
96 in. Ibs.
TC1.F 250 250 in. Ibs.
96 in. Ibs.
JJ, JL, HJ, CJ T A 1-J300 250 in. Ibs.
210 in. Ibs.
TA1.J500 300 in. Ibs.
210 in. Ibs.
JP TA21250 250 in. Ibs.
96 in. Ibs.
LL, HL TXfl500 300 in. Ibs.
240 in. Ibs.
RM TA2.K5d0 300 in. abs.
96 in. Ibs.
TA3 K350 250 in. Ibs.
96 in. Ibs.
TA3-K400 250 in. Ibs.
96 in. Ibs.
TC2-K500 300 in. Ibs.
96 in. Ibs.
TC3-K 350 250 in. Ibs.
96 in. Ibs.
HM, CM TA2-M350 250 in. Ibs.
240 in. Ibs.
TA3-M400 250 in. Ibs.
240 in. Ibs.
TA4.M350 250 in. Ibs.
240 in. Ibs.
TA4-M500 300 in. Ibs.
240 in. Ibs.
TC2-M400 250 in. Ibs.
240 in. Ibs.
TC2-M500 300 in. Ibs.
240 in. Ibs.
TC3-M400 250 in. Ibs.
240 in. Ibs.
[,
TC3-M500 300 in. Ibs.
240 in. Ibs.
KP, H K TA4P500 250 in. Ibs.
240 in. Ibs HP, H R, CP, CR TAS-P600 300 in. Ibs.
300 in. Ibs.
Values Shown Are t5 in. Ibs.
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CA U TION Atolded Case Circuit Breakers must always be completely de-energized, disconnected and isolated before any tests or maintenance are attempted.
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Gould Inc Circust Protection Division Spr.ng House. PA 19477 E
Tetephone 215-628-7400 Du etin 2 0.1 - 2 A 7 SHG377 n
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