ML20058M149
| ML20058M149 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 04/15/1992 |
| From: | Schiavoni R SARGENT & LUNDY, INC. |
| To: | |
| Shared Package | |
| ML20058M143 | List: |
| References | |
| 8913-67-19-2, 8913-67-19-2-R, 8913-67-19-2-R00, NUDOCS 9310040032 | |
| Download: ML20058M149 (55) | |
Text
{{#Wiki_filter:_. _ sanexx2 a IrwrY 184689 ENG1NEERS FOUNDEDIS9a Es EAST MONaOE STREE' Calc AGO. ILLINO:S 60603 5780 o'a s mes-ao 2 S&L Letter No. Q1452E 4 April ~16, 1992 , Project No. 8913-67 commonweal,th Edison Company Quad Cities Station - Units 1 and 2
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Transmittal of " Evaluation of 460-V Diesol Generator Cooling Water Pump Minimum Starting voltage" Calculation W.O. No.: N/A - Mod. No.: N/A System Codes: N/A Mr. M. L. Reed Electrical /I&C Design Superintendent commonwealth Edison Company Nuclear Engineering Department 1400 Opus Place, Suite 400 , Downers Grove, Illinois 60515 i
Dear Mr. Reed:
Enclosed is a copy of Design Input Transmittal (DIT) QC-EXT-0061-which transmits the following Sargent & Lundy calculation: Calculation 8913-67-19-2, Revision 0, dated April 15, 1992,
" Evaluation of 460-V Diesel Generator Cooling Water Pump Minimum Starting Voltage."
The locations of the calculation purpose, methodology, assumptions, and any engineering judgements are referenced in the enclosed DIT. Should you have any questions, please call me at (312) 269-6246. 9: Yours very truly, R. M. Schiavoni . Senior Electrical Project Engineer RMS:mco - qdqc2689.ep . In duplicate , Enclosure - Addressee Only Copies: See page two / 9310040032 DR 930923 77 ADOCK 05000254 J PDR
i SARGENT & LUNDY g E N GlN E EO3 ' CMiCAGP~ , Mr. M. L. Reed S&L Letter No.-Q1452E Commonwealth Edison Company April.16, 1992 ~ Project No.- 8913-67 J
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' Copies:
BWR Systems Design Superintendent (H. L. Massin) (1/1/0) CHRON. Systems- . .
-Acting Bp Systems Design Supervisor.-(B. M. Wong).
(1/1/1) Site. Engineering Supervisor.(C. A. Moerke) (1/1/0). (1/1/ 0) .'
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Assistant Supt. of Work Planning (W. McGaffigan). (1/0/0)
- M. S. Tucker /M. Lesnet R. H. Jason (1/1/0)
T. J. Ryan (1/1/0) E. Schumacher/ File '(1/0/0)- S. Z. Haddad .(1/1/1)-
-(1/1/0) i I
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4oAA61 Av l SARGENT & LUNDY DESIGN INFORMATION TRANSMTITAL ENODfEERS X SAFETY-RELATED NON-SAFETY-RELATED DIT No. - OC-EXT 0061 Page 1 of 1
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CLIENT Commonwealth Edison Comoany To M. L. Reed STATION Oaad Cities - UNIT (S) 1&2 PROJECT NO(S) 8913-67 SUBJECT Transmittal of Calculation 8913-67-19-2. Rev. O. Dated 4/15/92 " Evaluation of 460-V Diesel Generator Coolin't Water Pumn Minimum Startina Voltare. I MODIF CATION OR DESIGN CHANGE NUMBER (S) N/A R. M. Schinyoni EPED b ' 4/16/92 PREPARER (PLIASE PRINT NAME) DIVISION PREPARER *3 SIONATURE ISSUE DATE KTATUS OF INFORMATION (This indormauon is apprwed br mes. Design inbr=== sppromed br use, that consaans amanupones er is prolinmanry or reguaree Barther verih= (revww) dad be so idenu5ed.)
' Ibis infarrr=r= is appewed for uan.
This informeceae is prwided is accordemme wish the tornus and eaa<in== of the servios agresemess/contance between Serpent & Laandy (SAL) and its clism governing the associased services. Wah roept no any third party eas, S&L does not -- obbgetboa ao said IIurd party as to abs accuracy, cceWae ==, ussadanas, or v-afnessag mesure of mach isfor=== IDENTIFK'AT33N OF THE SPIICIPE' DEEKM DOCRMATE)N TR6 AND PURPOSE OF B5UE (lina any supportugA-==== anached to Drr by its title, revamos and/or issus deae, and sacal =*=h-e of pages for each anyporang doon===r ) CW=6 8913-67-19-2, Rev. O, dated 4/15/92, *Evah=ra f 460-V o Diesel Generumor ParJnar Woest Pump bCaussani Startug Vokage." The purpons, methodobgy, and assumptions can be found in the binowuq e=Wi== escuous and pages: Purpons Section III, Page 4 Methodology: Section VII, Page 8 Assurptions and Engineering Judgemes4: Section V. Page 6 Cosapatuos of Resuks wnh Accepsance Criteria: Section IX, Page 16 l u ! 1 l sOCRCE OF MPORMAMM
- C.ic. No. 8913-67-19-2 0 4-15-92 Raport No. N/A. ,
l' Rav. and/or date Rev. and/or does Other
- l Dessumpummmt ses Laraar Ql452E, Desed April 16,1992 #
Form OQ-3.17.1 Rev. 2 1
Calc. For Evaluation of 460V Dieset Camretor Cooling Csic. N3. 8913-67 19 2 SARGENT1 LUNDY wter pg minian startins voltes. ENGNEERS Rev. o Date 9.jp g X Safety-Related Non-Safety-Related Page 1 of 20 Client commermeetth Edison Casperwr Prepared by @ nam do Date 4[/5[92. Project Quad cities unit 1, Div.11; units 182, Div.! Reviewed by J Date 4 -/f*/L M. Proj. No. 8913-67 Equip. No. Approved by 7h [. k Date k-/Pf 7_
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.L REVISION
SUMMARY
and REVIEW METHOD e A ". Revision Summarv Revision 0, First Issue, Page 1 through 20, Al tnrough A5, B1 through B2, C1 through C3, D1 through DS, El through ES, F1 through F9, and G1 through G2 i i I 1 f
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184669 Calc. Far Ev:1uation of 460V Disset cworstor Cooling Calc. ND. $913-67-19 2 SARGENT& LUNDY Water Purp Mininun Starting voltage Rev. O Date ENGNEERS _ X Safety-Related Non-Safety-Related Page 2 of 20 Client Commormeestth Edison Company Prepared by Date Project Cupd Cities pnit 1, Div.II: Dolts 112, Div.! Reviewed by Date Proj . No. 8913-67 Equip. No. Approved by Date REVISION
SUMMARY
and REVIEW METHOD (continued)
, d. METHOD OF REVIEW OA CALCULATION REVIEW CHECKLIST TYPE OF CALCULATION k Hand-Prepared Design Calculation Only O Computer-Aided Design Calculation Only 0 Both hand-Prepared and Computer Aided Design Calculation FOR HAND-PREPARED DESIGN CALC FOR COMPUTER-AIDED DESIGN CALC (check the soorooriate items) feheck the accrocriate items) k Detailed review of the original D A review to determine if the engineering calculation. design and analysis computer program (s) ,
used have been validated and documented t D Review by an alternate, and that the calculation, regardless of simplified or approximate method the program used,contains all the + of calculation. necessary documentation for reconstruction at a later date. O Review of a representative (MUST BE PERFORMED) sample of repetitive ; calculations. O A review to verify that the computer program is suitable to the problem being O Review of the calculation analyzed. (MUST BE PERFORMED) against a similar calculation previously performed. O A review to determine if the input data es specified for program execution is consistent with the design input, correctly defines the problem for the computer program algorithm and is sufficiently accurate to produce results f within any numerical limitation of the 5 program. (MUST BE PERFORMED) i ES C A review to verify that the results obtained from the program are correct and ; within stated assumptions and limitations of the program and are consistent with the input. (MUST BE PERFORMED) D Validation documentation for temporary changes to listed programs or - developmental programs or unique single application programs shall be re; viewed to assure that methoi:Is used adequately validate the pr ogram for the intended application; -(WHERE APPLICABLE) REVIEWER: .c DATE: 4. /J % 7 L u- y ,
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V v/ i Calc. For Evaluation of 460V Diesal G2Mrator CootinD Calc. N3. 5913 67-19 2 j SARGENTi LUNDY Water Pep Minivrap Starting Voltage Rev. O Date ENGINEERS _ X Safety-Related Non-Safety-Related Page 3 of 20 Client Ccamenwealth Edison company Prepared by Date l Project Quad Cities Unit 1, Div.11; Units 152. Div.! Reviewed by Date Proj. No. 8913-67 Equip. No. Approved by Date II, TABLkOFCONTENTS I
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Section' Contents - Pace No. I. REVISION
SUMMARY
and REVIEW METHOD . . . . . . . . .. 1 II. TABLE OF CONTENTS . . . . . . . . . . . . . . . . .. 3 III. PURPOSE / SCOPE . . . . . . . . . . . . . . . . . . .. 4 IV. INPUT DATA . . . . . . . . . . . . . . . . . . . . .. 5 V. ASSUMPTIONS . . . . . . . . . . . . . . . . . . . .. 6 VI. ACCEPTANCE CRITERIA . . . . . . . . . . . . . . . .. 7 VII. METilODOLOGY . . .. . . . . . . . . . . . . . . . .. 8 VIII. CALCULATIONS and RESULTS . . . . . . . . . . . . . .. 9 IX. COMPARISON of RESULTS with ACCEPTANCE CRITERIA . . .. 16 X. CONCLUSIONS . . . . . . . . . . . . . . . . . . . .. 17 XI. RECOMMENDATIONS . . . . . . . . . . . . . . . . . .. 18 1 XII. REFERENCES . . . . . . . . . . . . . . . . . . . . .. 19 ATTACHMENTS . . . . . . . . . . . . . . . . . . . . . . . .. 20 ass 0 4
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Calc. For Evaluation of 460V Diesel Gsnerator Cooting Calc. No. 6913-67-19 2 SARGENTi LUNDY water en minia,n startino voltase Rev. o Date ENGINEERS _ I X Safety-Related Non-Safety-Related' Page 4 ~ of 20 Client ccamanuselth Edism Cw Prepared by Date ; Project Quad cities @it 1, Div.11; Units 112, Div.! Reviewed by - Date 'l Proj. No. 8913-67 Equip. No. Approved by Date l
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III, PURPdSE/ SCOPE i e r [ A'. Purpose t The purpose of this calculation is to determine the !
-~ntinimum starting voltage requirement for the 460V . .
diesel generator cooling water pump (DGCWP) motor.for ~~~ ' Quad Cities Unit 1, Division II; Units 1&2, Division I. B. Scope i The scope of this calculation covers the steps l l necessary to determine the accelerating time of the . i subject motors, minimum voltage, and the possibility of '. l nuisance tripping during starting for Quad Cities Unit ; : 1, Division II; Units 1 and 2, Division I. The DGCWP ; ! motor for Unit 2, Division II will be addressed , i separately. .j. i F s , 5 E ! s ;
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184669 d cale. For Evaluation of 460V Dieset Generator tooting Cale. No . E913-6719 2 SARGENT1 LUNDY . w ter puno minian startino vattese Rev. o Date ! ENGNEERS _ " X Safety-Related f Non-Safety-Related Page 5= .of 20 -i, i client commanueelth Edison campery Prepared by Date { Proj ect Quae Cities *unf t 1. Div.!! Units 112, Div.I Reviewed by
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Date [ Proj. No. 8913-67 Equip. No. Approved by Date
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- IL. INPUT DATA
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, A'. From Reference XII-1, the motors with frame size 365TS .;
have the following characteristics- '2
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- 1) an inertia of 14.76 lb-ft2 ;
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- 2) a maximum motor accelerating time of 15 seconds. !
- 3) available speed and torque data :
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't Conditions Torque Speed ;
(lb-ft) (rpm) ; Locked rotor 212 0 ' Pull up 148 1270 ; i. Breakdown 367 3260 - Full load 150 3525 ' 1 B. From Reference XII-2: ' Inertia of the DGCWP assembly is 3 lb-ft2
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C. From Reference XII-6: as ! The locked-rotor kVA per horsepower for the DGCWP motor 'j
- is chosen to be 4.99. This value represents the upper range of the locked-rotor kVA per horsepower for NEMA Code-E AC motors.
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184669 Calc. For Evaluation of 460v Diesel Generator Cooling Calc. No. 8913-67-10-2 SARGENTi LUNDY water pg mininun Starting voltage Rev. O Date ENGINEERS , X Safety-Related Non-Safety-Related Page 6 of 20 Client Commorwealth Edison campany Prepared by Date a .. -- Project Quad cities unit 1, Div.11; units 112, Div.! Reviewed by Date P roj . No . 8913-67 Equip. No. Approved by Date
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4 L ASSUMPTIONS
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.a cale. For evetuation of 46cv Dies.i cener. tor coating enicgy9gggggz ,
-v e l SARGENTi LUNDY/ 'htater Pwp minin.n starting volt.ge Rev. O Date l ENGINEERS . .
I! X Safety-Related Non-Safety-Related Page.7 of 20 : I CITest c- _tth Edison consary Prepared by Date { Project ouab citiessunf t 1, Div.!!; units 1&2, Div.! Reviewed by Date Proj. No. 8913-67 Equip. No. Approved by Date ! 5 I L ACCEPTANCE CRITERIA i
/ I. The minimum starting voltage should be able to provide-a motor torque that is 25%.over the required load. ,
torque during acceleration. This 25% margin is a ! conservative recommendation obtained from Reference XII-5. ; B. The acceleratinJ time for the motor with frame size 365TS'should be less than or equal to 15 seconds. (Reference XII-1) C. ' The motor accelerating time should be less than'the ; trip time set on the DGCWP motor protective device. l .! I . 5
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* . U 't .h h h Calc. For Evaluation of 460V Diesel Grnerator Cooling calc. ND. 8913 67-19 2 SARCfi.NT i LUND( water pw p minimum starting volt.g. Rev. o Date D G NEERS X Safety-Related Non-Safety-Related Page 8 of 20 i
Client Commormatth Edison Comparvr Prepared by Date-Project 00ad Cities, Unit 1. Div.!!: Units 112, Div.! Reviewed by Date Proj. No. 8913-67 Equip. No. Approved by Date VII. MET ODOLOGY I
,' 'A . Given the locked rotor, pull up , breakdown and full load conditions from Reference XII-1, a speed versus torque curve similar to that of a NEMA Design-B Motor will be constructed.
B. Following the fcct that the motor torque is proportional to the voltage squared, a starting voltage of 70% of the motor rated voltage is selected as a reasonable minimum motor starting voltage. The perfermance of-the motor under this voltage will be evaluated. C. To be conservative, the pump curve corresponds to the open discharge valve condition in Reference XII-3 will be selected to describe the speed versus torque characteristic of the centrifugal pump. D. The motor starting time will be calculated for the minimum voltage established in step B above. I E. The criterion of 25% torque margin outlined in Acceptance Criteria VI-A will be verified.
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F. Finally, the motor starting time found in step D will i be compared to the characteristics of the DGCWP motor ) protective devices in order to ensure that nuisance j trips will not occur during starting. ' us
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-. - vUy Calc. For Evaluation of 460V Diesel Gtnerator Cooling - Calc. N3. Got3-67-19-2 SARGENT*: LUNDY water parro winimum starting vettage Rev. o Date ENGJNEERS X Safety-Related Non-Safety-Related Page 9 of 20 Client consornsealth Edison Company Prepared by Date Project Quad Cities Unit 1, Div.II: Units 112, Div.I Reviewed by Date Proj. No. 8913-67 Equip. No. Approved by Date VIII. CALCUbTIONSandRESULTS I
A. ,' MOTOR TOROUE VERSUS SPEED CURVE Given the locked rotor, pull up, breakdown, and full load conditions from Reference XII-1, a torque versus speed curve similar to that of the NEMA Design-B Motor is , constructed and shown in Figure 1. The following table is a summary of the given data: Table 1 Motor's Torque Versus Speed Data Conditions Torque % of Full Speed % of Full (lb-ft) Load Torque (rpm) Load Speed ; Locked Rotor 212 141.3 0 0 Pull up 148 98.7 1270 36.0 Breakdown 367 244.7 3260 92.5 , Full load 150 100.0 3525 100.0 Note that the curve in Figure 1 is plotted in % of full load torque versus % of rated speed at the rated voltage. 92 a
= 4
t 'ooy i Ceice FCr Evaratrco, & ~50p T*cset u"coeraie, coc. nc 8913 67-19-2 1 ; SARGENT&LUNDY i cea,,,e w e N e ^4<~ ~ m N *,e vo w c. "" 0 Ma ,
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p... ,o - e. 2o- ! r Pr.p.r.d by D.t. cilent co. onw.lf4 E/ sori _ C. grey , Project Quad C,f,gg y,,,f f, p,y g , un;ts g g,2 , p,y,3 Reviewed by D.te ; Proj. No. gg/3 g7 4 Equip. No. Approv.d by_ D.t. i
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b OF' RATED SPEED ( pua-toa)
184Ax.o, CO.lc. Far Evaluation of 460V Disset Ginerator Cooling Calc . No. C913 67-19 2 SARGENTl LUNDY water PJrp MinimJn Starti% Voltage Rev. O Date ENG!NEERS _ X Safety-Related Non-Safety-Related Page 11 of 20 i Client Caumonwealth Edison campany Prepared by Date P Project Quad Cities ' Unit 1 Div.II; 1Anits 1&2, Div.1 Reviewed by Date Proj. No. 8913-67 Equip. No. Approved by Date CALCULATIONS' and RESULTS (continued) I , I B. ' ACCELERATING TIME REOUIRED TO START THE MOTOR Using a starting voltage of 70% of 460 Volts, the accelerating time required to start the motor is 3.775 seconds and the minimum accelerating torque is 43.005 lb-ft. These values are calculated using a spreadsheet given in Table 2. The followings identify the columns in Table 2: Column No.1 - speed interval in percent of full load rpm Column No.2 - beginning of speed interval in rpm. (Column No.1 times full load speed - 3525 rpm) Column No.3 - end of speed interval in percent of full load ~ rpm Column No.4 - the magnitude of speed interval in rpm Column No.5 - motor torque output in lb-ft at rated voltage obtained from Figure 1. ; Column No.6 - motor torque output in lb-ft at the j motor minimum starting voltage (Column No.5 j multiplies the squared ratio of the minimum _: starting voltage to the rated voltage) l C.71umn No. 7 - load torque (open discharge valve) in percent of full load torque read from , % Reference XII-3 ) i Column No.8 - load torque in lb-ft (Column No.7 times ] full load torque of the motor) j Column No.9 - net accelerating torque in lb-ft (Column ] No.6 minus Column No. 8) ColumnNo.10-timetoacceleratethroughsheedinterval using the formula given in Reference XII-4 !
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'184669 j cale. For Evaluation of 460v Diesel Generator cooling calc. No. 8913-67 19 2 !
S%RGENTE LUNDY water en mini,un st.rting vottese Rev. o Date I
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ENGINEERS X Safety-Related Non-Safety-Related Page 12 of 20 !
.i client commermeetth Edison Capury Prepared by Date Project Dund Cities Opit h-Oiv.!!, Units 112, Div.! Reviewed by Date !
Proj. No. 8913-67 Equip. No. Approved by Date I CALCULATIONS' and RESULTS (continued) i
, j (ARPM)*(WK) 2 j J =
t i ( 3 0 8 ) *T, . l t i where t = accelerating time in seconds i aRPM = change in rpm (Column No.4) [
= net accelerating torque'in lb-ft (Column No.9)
T,2 WK = total inertia of motor and pump in lb-f t2 . i In this calculation, ! 4 RPM = 176.25 rpm (Table'2, Column No.4) *
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WK 2 = 14.76 + 3.0 = 17.76 lb-ftz (Reference XII-1,2) , i i t. Column No.11 - the cumulative time for the motor to 1 accelerate at 70%-rated voltage -' i I
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B f Calc. For Evaluation of 460V Diesel Generator Cooling Calc. No. 8913-67 19 4 SARbENi L Water Pump Minimum Starting Voltage Rev. O Date
- __ __. 3 ENGNEERS _
X Safety-Related Non-Safety-Related "
- Page 13 of 20 Client comonwealth Edison Company Prepared by , Date Project Quad Citles Unit 1, Div.II Units 1&2, Div.I Reviewed by Dats Proj. No. 8913-67 Equip. No. Approved by ^
Date Table 2 Cumulative Time to Accelerate at 70% Rated Voltage
% OF INITIAL SFEED E SE55D YdYO5-~d50VE T MOTOR TORU W % of LokD TORQUE NET AUC. ~ lIEE W hCC. CUMULATIVE FULL SPEED THE END OF INTERVAL IN lb-ft IN lb-ft LOAO IN '!ORQUE THROUGH $ PEED TIME LOAD SPEED (RFM) INCREMENT (RFM) 9 1004 9 704 TORQUE lb-ft IN lb-ft INTERVAL IN SEC. IN SEC.
(1) (2) (3) (4) (5) (6) (7) (8) (9) q10) (11) 0.000 0.000 176.250 176.250 212.000 103.880 15.000 22.500 81.380 0.125 0.125 5.000 176.250 352.500 176.250 195.000 95.550 9.500 14.250 81.J00 0.125 0.250 10.000 352.500 528.750 176.250 183.000 89.670 6.700 10.050 79.620 0.128 0.378 15.000 528.750 705.000 176.250 172.500 84.525 5.000 7.500 77.025 0.132 0.509 20.000 705.000 881.250 176.250 163.500 80.115 5.500 8.250 71.865 0.141 0.651 25.000 881.250 1057.500 176.250 155.250 76.073 1.000 10.500 65.573 0.155 0.006 30.000 ,1057.500 1233.750 176.250 150.000 73.500 9.500 14.250 59.250 0.172 0.977 35.000 1233.750 1410.000 176.250 148.500 72.765 12.500 18.750 54.025 0.188 1.166 40.000 45.000 1410.000 1586.250 1586.250 1762.500 176.250 176.250 151.500 159.000 74.235 77.910 16.000 20.500 24.000 30.750 50.235 47.160 0.202 0.216 1.368 1.583
] $ 9. 00(> . _1762.500 19J8.750 176.250 169.500 83.055 25.500 30.250 44.805 0.227 1.810 ,
55.000 1938.750 2115.000 176.250 183.000 89.670 30.500 45.750 43.920 0.231 r 2.042 60.000 2115.000 2291.250 176.250 199.500 97.755 36.500 54.750 43.005 0.236 2.278 65.000 2291.250 2467.500 176.250 220.500 108.045 42.500 63.750 44.295 0.229 2.507 70.000 2467.500 2643.750 176.250 244.500 119.805 49.500 74.250 45.555 0.223 2.730 ~ 75.000 2643.750 2820.000 176.250 271.500 133.035 56.500 84.750 48.285 0.210 2.941 80.000 2820.000 2996.250 176.250 304.500 149.205 64.500 96.750 52.455 0.194 3.135 85.000 2996.250 3172.500 176.250 340.500 166.845 73.000 109.500 57.345 0.177 3.112~ 90.000 3172.500 3348.750 176.250 363.000 177.870 81.500 122.250 55.620 0.183 3.495 ]d 95.000 3348.750 3525.000 176.250 351.000 171.990 90.500 135.750 36.240 0.280 Lt . 7 7 5 100.000 3525.000 100.000 150.000 cd Ch W 3
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*UU7 - i calc. For Evaluation of 460V Diesel Generator Cooling ' Calc.~No. 8913-67-19-2 l 1
SARGENTi LUNDY water % minian starting voltage; Rev. O Date- 1 ENGNEERS _ - j X Safety-Related Non-Safety-Related Page 14 -of 20 Client C-tth Edison Caperty Prepared by Date Project Qua4 Cities wit 1, Div.!!; Units 142, Div.1 Reviet,ed by Date i 1 Proj. No. 8913-67 Equip. No. Approved by Date l
, b CALCULATIONS and RESULTS (continued) '
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Table 3 demonstrates that a torque margin of at least 25% l over the load torque is maintained with 70% motor rated , voltage (460 V) during starting. Columns in Table 3 are identified,as follows: > Column 1 through 9 - same as in Table 2 , Column 10 - load torque in lb-ft with 25% margin (Column No. 8
- 1.25)
I Column 11 - net accelerating torque in lb-ft - with 25% margin (Column No. 6 minus s Column No. 10) + Note that the point on the spreadsheet at 95% speed- , represents a point at which the motor is entering into steady-state operation after the accelerating period has , been completed. 4 ; f C. NUISANCE TRIPPING DURING STARTING Reference XII-8 indicates that the DGCWP motors are protected by a 200 ampere General Electric type RMS-9 trip , device with a long time tap of 0.8 times trip unit rating ! (160 A) or higher ,and a time band setting of 2. At 70% rated voltage, the corresponding maximum locked rotor > current will be t 100
- 4.99.t !
g 0.7 * = 438.4 A V3
- 0.46 ;
i f or 2.74 times the circuit breaker trip device setting. This corresponds to a tripping time of about 23 seconds. Since the motor starts in less than 4 seconds, nuisance . tripping is not a concern. , j Note that i denotes the allowable locked-toSor kVA per i horsepower value for the 100 horsepower. NEMA " Code-E'DGCWP l motors (Reference XII-6,7). ' L i i
- - , - - - _~ ,m - * - .-
g , Calc. For Evaluation of 460V Diesel Generator Cooling Colc. No. 8913-U - D 2 !~ S RGENTI LUNDY Water Pump Minimum Starting Voltage Rev. O Date i ENGWEERS X Safety-Related Non-Safety-Related Page 15 of 20 Client Commonwealth Edison Company Prepared by - Date Project Quad Cities Unit 1, Div.II; Unite 1&2, Div.I Reviewed by 'N Date Proj. No. 8913-67 Equip. No. Approved by ' - Date Table 3 Net Accelerating Torque With 25% Margin 7 5i [AL 1 OF~ 5}E50 e SI'EED MOTOR TOPOUE MOTOR TORUCE 4 0F LOAD NET ACC. FULL SPEED THE END OF INTERVAL IN Ib-ft IN lb-ft LOAD LOAD _7E VE NET ACC. TORQU L TORQUE IN TORQUE WITH 25% MARGIF WITH 25% MARGIN LOAD SPEED (RPM) INCRENENT (RPM) @ 100s e 70% TORQUE tbaft IN Ib-ft IN Ibaft IN jb-ft (1) (2) (3) (4) (5) (6) (7) (8) 0.000 0.000 (9) (10) (11) 176.250 176.250 212.000 103.880 15.000 22.500 5.000 176.250 3526500 176.250 81.J80 __ 28.1250 75.755 195.000 95.550 9.500 14.250 81.30'~ 17,8125 10.900 352.500 528.750 176.250 17.138 15.000 528.750 705.000 176.250 183.000 172.500 89.670 6.700 10.050 79.62 I 12.5625 77.108 84.525 5.000 7.500 17.025 9.3750 20.000 705.000 881 250 176.250 163.500 75.150 80.115 3.500 8.250 71.865 10.3125 25.000 881.250 1057.500 176.250 69.803 155.250 76.071 7.000 10.500 65.573 13.1250 30.000 1057.500 1233.750 176.250 150.000 _ 62.946 73.500 9.50s 14.250 59.250 17.8125 35.000 1233.750 55.688 1410.000 176.250 148.500 72.765 12.500 40.000 ~ 1410.000 1586.250 176.250 1 (750 54.015 23.4375 49.328 151.500 74.235 16.000 ;s 00 50.235 30.0000 44.235 45.000 1586.250 1762.500 176.250 159.000 77.910 20.500 30.750 47.160 38.4375 39.473 50.000 1762.500 1938.750 176.250 169.500 83.055 25.500 38.250 44.805 47.8125 35.243
's 55 00Q. 1938.750 2115.000 176.250 183.000 89.670 30.500 45.750 43.920 57.1875 32.483 60.000 2115.000 2291.250 116.250 199.500 97.755 36.500 54.750 43.005 68.4375 65.000 2291.250 2467.500 29.318 176.250 220.500 108.045 42.500 63.750 44.295 79.6875 70.000 28.358 k467.500 2643.750 176.250 244.500 119.805 49.500 74.250 45.555 ) 92.8125 26.993 75.000 2643.750 2820.000 176.250 271.500 133.035 56.500 84.750 48.285 105.9375 27.098 h4 80.000 2820.000 2996.250 176.250 304.500 149.205 64.500 96.750 52.455 120.9375 28.268 85.000 2996.250 3172.500 176.250 340.500 166.845 73.000 109.500 r* )
57.345 136.8750 29.970 90.000 3172.500 33 4.750 176.250 363.000 177.870 81.500 122.250 55.620 152.8125 25.05R 4h 95.000 3348.750 3525.00_O 176.250 351.000 171.990 90.500 135.750 100.000 36.240 169.6875 2.302 Dg 3525.000 l 100.000 150.000 187.5000 0 4
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4 Roe n Calc. For Ev.tuation of 460V Diesst Generator Cooting Calc. N3. /1 6 19 2 SARGENTE LUNDY water p u minimen starting vettage Rev. o Date ENGINEERS . X Safety-Related Non-Safety-Related Page 16 of 20 Client Canumrweetth Edison Campary Prepared by Date , Project Quad Cities. unit 1, Div.!!; Units 182, Div.1 Reviewed'by ' Date l Proj. No. 8913-67 Equip. No. Approved by Date
& COMPA ISON of RESULTS with ACCEPTANCE CRITERIA i
,' The net accelerating torque in Table 3 shows that with 70%
of rated motor terminal voltage, the 25% torque margin as outlined in Acceptance Criteria VI-A is satisfied during the_ acceleration. From Table 2, the calculated accelerating time is 3.775 seconds which is less than the maximum allowable accelerating time of 15 seconds. Nuisance tripping shall not occur since the 3.775 seconds accelerating time of the motor is less than the anticipated 23 seconds trip time set on the DGCWP protective device. 1 u 4 O I l r' I
A v v 0 0 7-Calc. For Evaluation of 460V Diesal Generator Cooting Caleu No. - 8913 6710-2 SARGENT2 LUNDY w.ter en siinimum starting voltage Rev. O Date ENGNEERS _ X Safety-R. elated Non-Safety-Related Page 17 of 20 Client Commmwealth Edison rm Prepared by Date Proj ect Quas cities. ynit 1, Div.it; units 112. Div.1 Reviewed by i Date Proj. No. 8913-67 Equip. No. Approved by Date L CONCbUSIONS I
' A minimum starting voltage of 70% of 460 Volts has been established for the s55 ject diesel generator cooling water pump (DGCWP) .
At this voltage, the DGCWP motor is capable of maintaining a torque at 25% over the required load torque during acceleration without nuisance tripping of the protective device. e I l l 1 l SS i I l I 1 V I 1
~. -
-184 A A 4, Calc. For Evaluation of 460V Diesel Generator cooling Calc. N3. 5013-67-19 2 SARGENTi LUNDY water peo minin.,n starting vettage Rev. o nate ENGINEERS .
X Safety-Related Non-Safety-Related Page 18 of 20 Client commonwealth Edison Company Prepared by Date Project Guad; Cities unit 1,Pv.!!; Units 112, Div.! Reviewed by Date Proj . No. 8913-67 Equip. No. Approved by Date :
/
L RECOMMENDATIONS 1
/ N$t applicable since it is not required for the scope of this calculation.
k 43 4 6 s 0 e
dO46hp C31C. For E<atuation of 460V Dieset Gsnerator Cooting Calc. No. 8913 67-19-2 SARGENTi LUNDY water ptro esinimt,n starting voltage Rev. o Date ENGNEERS X Safety-Related Non-Safety-Related Page 19 of 20 client- cosims:rmaealth Edison ctmpary Prepared by Date Project Quadicities unit 1, Div.!!: Units 182, Div.! Reviewed by Date Proj. No. 8913-67 Equip. No. Approved by Date XII,_ REFERENCES
- d. Memo transmitted by Mr. D. Barton of Lincoln Electric Co. to J.
Wisniewski of S&L, dated March 20,1992. (Attachment A) This reference provides the locked rotor, pull up, breakdown and full load conditions for the torque versus speed curve, inertia and maximum accelerating time.
- 2. Memorandum of telephone conversation between Mr. S. Kiefer of Ingersoll-Rand and J. Wisniewski of S&L, dated March 20, 1992.
(Attachment B) This reference provides the data for the total inertia of the diesel generator cooling water pump.
- 3. Louis-Allis Curve No. 18296, dated November 6,1975. (Attachment C)
This reference provides a typical torque versus speed curve for a centrifugal pump.
- 4. Sargent & Lundy Standard ESC-307, Section.11, " Accelerating time and losses."
This reference provides the method and formula to calculate the motor acceleration time.
- 5. Moore, R.C. "An Analytical Look at Squirrel Cage Induction '
Motor Startup," Power Enaineerinct, November, 1964 p.48-51. (Attachment D) This paper recommends that the motor torque should be about 25% over the required load torque during accelerating period.
- 6. NEMA Publication No. MG 1-1987, Part 10.37.
This material provides the range of locked-rotor kVA per horsepower for motor having NEMA code letter designation. M 7. Fax transmittal from Mr. J. Cruz~to Mr. R. Schiavoni of S&L, 1 dated March 17, 1992.(Attachment E) ; This transmittal provides the walkdown DGCWP motor data for l Quad Cities Station. _
- 8. Telecopy Transmittal from Mr. L. Cabrera of CECO. to Mr. A. G. '
Ashrafi, dated April 14, 1992.(Attachment F) This material provides the NED record of existing settings for i the breaker that feeds DGCWP at Quad Cities' Station. )
- 9. GE Type-AKR circuit breaker RMS-9 trip' device time-current curve GES-6227, dated November, 1986.(Attachment G)
184669 Calc. For Evatustice of 460V Diesel Generator Cooting Csic. No. 6913 67-19 2 SARGENTi LUNDY water e n minini , starting vatt.ge Rev. O Date ENGWEE.
- X Safety-Related Non-Safety-Related Page 20 of 20 Client commonwestth Edison consaary Prepared by Date Proj ect Duad Cities, Unit 1. Div.!!; units 1&2, Div.I Reviewed by Date Proj. No. 8913-67 Equip. No. Approved by Date ATTACHMENTS /
t
/ '
Attachment A DGCWP Motor Characteristics A1 - A5 Attachment B Inertia of DGCWP B1 - B2 Attachment C Typical Centrifugal Pump Torque Versus C1 - C3 Speed Curve Attachment D Paper on Induction Motor Starting D1 - D5 Attachment E Walkdown DGCWP Motor Data E1 - E5
. Attachment F Existing Settings for DGCWP F1 - F9 Attachment G Time-Current Curve for GE AKR Breaker G1 - G2 l
I i l i ( { i t i N 4 9 l l
f184669 Calc. For Evaluation of 660V Diesel Generator tooling Calc. N3. C913 67-19 2 SARGENTi LUNDY water pun , mini,,un starting vettage Rev. o Date ENG:NEERS _ X Safety-Related Non-Safety-Related Page Al of AS Client Consucnsealth Edison Cm Prepared by Date Proj ect Quad Citiest unit 1, Div.!!; Units 1&2, Div.I Reviewed by Date Proj. No. 8913-67 Equip. No. Approved by Date l ATTACHMENT A DGCWP MOTOR CHARACTERISTICS 4 4 Y
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>184669 Calc. For Evaluation of 460V Diesel Generator Cooling Calc. No. 5913-67 19-2 i '
SARGENT4 LUNDY water en minia ,st.rting vettage Rev. o Date ENGINEERS _ X safety-Related Non-Safety-Related Page B1 of B2 Client Commeraseetth Edison Comparty Prepared by Date Project Qua5 Cities bMit 1, Div.!!; units 112, Div.! Reviewed by Date Proj. No. 8913-67 Equip. No. Approved by Date
/
I
/
o ATTACHMENT B INERTIA OF DGCWP sa e i
= 9
l
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mm za *cs ,- e=ce ~=.:. ~c f .h, ws ---- 705 555 37l'i ,i ci '70:. . 5 3-"iI t: 2 2:3 3 H 7-SENT SY: Xerox TeleicoiiF 'tbzt '. a m -o sARGENT & LUNDY E " LW E,,E ' Xarch 20, 1992 !
$1RGEff a LtDIDY Massorandsat of Telephone Convarsation l Bate 03/20/92 Tina 10tas a.m.
Company 708-665-3707 , Person called Incermell-Rand _ stavan Kiefer company Person calling, Batraent fr Lithdv (9&L) Jan B. Witniewski Project No. Project f E913 94 ound Cities- - Subject Discussed Pump Diesel Cooling Water 4 1 1 L-Sirmmary of Discussion, Decisions, and Commitments: \ This is to confirm our conversation this morning that the 558 (5x9 SB) l 2 pump, shaft, and coupling have a total inertia of appror.imately 2 lb
- ft ,
Please note the information supplied was basis price book pumps as they would be sold today. The number given was for reference only. Exact numbers would have to be derived and approved by Ingersoll-Rand Engineering. ,
]
rate. No. 6913-67-I9-2 j Ecv. O Date l i l a =_ ppP re +_ B2 of B7 \ [t'i; No. 8913-G7 l l Note: PLEASE coNFIRN THAT WE HAVEMR, ACCURATELYEW8KI RBCORDED VIA FAX AT THE NIO
- BY SIGNING BELOW AND RETURNING 312-269-3757. n -- _. i CONFIRMATIONt = STdk V 'f/
y - ocs
. I ylle QA Calculation ta iLL!
J.' B. Wisniewski
Calc. For Evaluation of t.60V Diesel Generator cooling Calc. No. 6913 67 19 2 i SARGENT1 LUNDY water puro mininum starting voltage Rev. O Date ENGINEERS _. 4 X Safety-Related Non-Safety-Related Page C1 of C3 I i Client- comemorn estth Edison company Prepared by Date Proj ect Guad Cities Upit 1, Div.!!; Units 1&2, Div.! Reviewed by Date Proj. No. 8913-67 Equip. No. Approved by Date I i i l
-we ATTACHMENT C TYPICAL CENTRIFUGAL PUMP TORQUE VERSUS SPEED CURVE i
h 6 843 l l I J i d I i
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November-6, 1975 L,], DATE ; l Lt.d LOUIS ALLIS enou R.1. Nauen M Litton MAvaukee. Wisconsin 53201 To M. J. Buckna . R. O. Brotherhoo ;
-J, L. Breitbach l
- - R. Halfpap' . i SUBJECT Load characteristics for design C'c . C. C. Cummins .
. E. J. Michaels
, J. F.-' Billings !
/ R. . Smick I .
~ Here if the third curve, No. 18296, for centrifugal pumps. It 1
- should be used to inform customers of our assumptions in the same .
way as-previous curves. - All'MD-70 standard motors have been designed to accelerate ^ NDIA . inertia (with load torque per NDiA MGl-20.42). This has not neces- r sarily been true of the 440 frame, however. Also,.in cost reduction or in evaluating " tight" designs, we have recognized that 2 pole , pump motors almost never see load inertia anywhere near the NEMA - -
' level. . i
)
So toiring 2 pole motor application closer to reality, and yet . ,
~ keep the assumptions simple, I have used 257. of net 4A as the maximum . ,
p inertia assumed for 2 pole motors. - - Please .do not - expect that a motor redesign for lower cost will- > automatically be possible if actual load inertia on any job turns ; out to be less than the attacheo assumptions. *he assumptions were chosen to eliminate.any need for oversized motors in the first ; place. However, if the application doks. require a special design,- ; cecause of the need to start at 50% voltage, for example, then it ' is possible that actual inertia less than these assumed values would permit a eneaper design. Again I must point out' that for us to : assume any load conditions is always a poor substitute for finding- - , l out what they really are. Cale. No, 8915-67-/9-Z Rev, O Dats page c2 .f c3 -l Proi. No. ~ 89I3 - 0 7 -- l 4a . aA L. Nailen'
-R. . .
i
' Chief Electrical' Enginecr, Large Motor Engineering ,
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u.:: :7 : - SPEED-TORQUE CURVE FOR CENTRIFUGAL PUMPS [ @. b USED FOR MOTOR DESIGN WHEN ACTUAL PU'1? CURVE IS DOT AVAILAHLE 100 . . . . . .
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0 . 20 40 60 00 100
% OF FULL LOAD TORQUE Basis for motor design'using this curve:
- 1. "otal load iScrtia [ including any couplings or gearing) not to er.cced: \
- c. The 1:EMA value for the motor rated horsepower, for 4 1800 rpn la slower motors. l 25% of the llEMA value, for 3600 rpn motors.
b.
- 2. The 1001 torcue point on the curve-corresponds to. motor ua namepinte. horsepower, and is therefore equal to motor i i
rated torouc. * . ,. =
- 3. Curves shown are not' applicable to axial-flow, mixed-flow, i l
piston, or screw pumps of any kind. _ Moto: A motor designed to safely accelerate the above load will D. . not necoscarily be cble to start a load having a different speed-torque curve, even thou;;h tho differenco may cppear slight. l
!.pprvd. by A d .h ///dr~
Curvo // 10290
184669 Calc. For Evaluation cf 460V Dieset Generator Cooting Calc. No. 8913 67 19-2
,: SARGENT3. LUNDY water pw o minimum starting vettage Rev. o Date ENGINEERS -
X Safety-Related Non-Safety-Related Page D1 of D5 client comeriweetth Edison Company Prepared by Date Project Quad tities uhtt 1, Div.ll: Units 112, Div.! Reviewed by Date Proj. No. 8913-67 Equip. No. Approved by Date i J l
/
o e ATTACHMENT D PAPER ON INDUCTION MOTOR STARTING l l 1 l l i l i 1 9 Y
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PRACTICAL fAETHODS of at.utu.. ,
' squirrel care induction muturn ar.. [
f ll full voltsge. reduced voltag,, ,,,,.; j i part winding. Of the thriv. i t,3 voltage starting is the simpt. ,,t u,..g
) '
'4 least expensive.
i [ Star _ ting at full voltage, 54uirt.- ; cage moMQagrpp_fu,,ug - 9, eMmore times full.1 pad.,xyr.
- d k ^
rent ,or,.kva P]nsities for lars. l '/ istarting_currg.r}ty,, a,r e kys. .dep3 ;t
.l g m 11 n s i #"Y P cN A f it #"*.a A P.# cI and~ possib!c ,,,momentar-y
.. v w .. . a . . .wn- w - w .' s MdE7~io{fa'gE drops. Others u..
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I clEde lli'ht flicker and abn..n..C AT SQUIRREL-CAGE operation at protective devier internrpt other feeder-conatt:.. l; motors or services. Undesirnt,!. : i DNDUCTBON MOTOR starting disturbances mar de c..r. rected in certain application- t-
! tolerable value.* by reducing snut..r -
i STARTING starting currents. now to do tai. depends on the characteristics ..! the motor, the load it drives. aral the motor starting used.
- t l FLJLL. VOLTAGE STARTING from a .
dr. large capacity bus may rerutt in l the motor drawing fulllocked ro:nr j j current. The motor must be de. ; signed to withstand this. Couplinr4 : i
- and driven machines also mu t I.- !
'y
, ablr to withstand the resultint j high motor starting torque. ac- -
CCIeration. etc. In_ general. Confi df . By R. C. M00RE Allis.Cholmers affg. Co. full. voltage.. starting where hid. !
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Table I-Calculatierts for Reactor $ tarting
. . . . . . . , . . . . y t .'
i .- . (6) (7) (8) (9) (R! -! (1) (2) (3) (4) (5) Z, 2, = 2. 4 Z, T V. ;: l' rig. 3 values dWided by 100 *Z. 16 _ I f. T. (5)s(2) (8)'s (3) tSD ,.. .. Futt Futi Power 1, = R. 4 pt. = E, Z. = (5) + (6) , p Reactor (1) (2)' (7) 4
. Speed voltage Voltage Factor ..
G4 .23 1.55 = .36 ,. j 1.51 l1.6C 3.12 = .36 + j 3.11 3.17 .30 W. e; i 0 6.35 1.20 3, 42 .5.* *
.50 5.75 1.54 .28 1.72 = .a 9 .t. I 1.65 j1.60 329 = .49 + j 3.25 3.05 5.23 1.75 .34 1.08 = .65 + j 1.77 l1.60 3.43 = .65 + l 3.37 2.84 .53 .f f; Os
.70 it 1.90
- 39 2.08 = .61 + ) 1.91 1 1.60 3.60 = .81 + l 3.51 2.75 .6.t M,*
.ft? 4.75 .
.85 4.40 2.01 .44 2.44 = 1.90 + ) 2.01 J 1.60 3.75 = 1.00 + 13.61 2.63 .72 6;, ,.
.94 0 *,
90 4.00 2.34 .54 2.47 = 1.33 a j 2.08 l 1.60 3.91 = 1.33 + j 3.68 2.53 2.26 1.36 J '* '
.95 3.08 2.55 .77 3.21 = 2 4 7 - l 2.04 11.60 4.40 = 2.47 + ) 3.64 ]
.25 520 = 4.42 - j 2.74 j 1.60 6.21 = 4.42 + j 4.34 1.59 1.47 . { , .,.
.97 1.90 2.10 :
I
- Motor base ohms = .3C0/ V 3 a 135 = 9 25 (3. phase motor- At -C' speed, estimate Z.. and if necessary rer'.t'
, t :- t .
i s- Fig. 3) , . Corno.itationsparenthet. cat numbers refer to colurnns in the to get desired la, remembenng inst . ; l ta ble. Z,. once daeermined, is unchangee for att so"d' ~ , (5) Z. = Motor base ohms dhnded try (2) (8) (9) Thes's columns mustieteed by 100. gwe 8" ' ,
= R. + jX., = (scalar value of 2.) X current and torgue valves usmg reactor. Da** 6~ , i
((4) + 1 V 1.(4)' ) In Fig. 4.
- a .
.' (10) Percent of suppty I.ne voltage et motor terw
- 6 ;
(6) Assume jX. = 2. (reactor resistance eetiected)
. . . . . . . . . . . . . . . . . . . . - .u- . . . . . . - . . . . . . . . . .
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. I.
l [ l '?
. T3 of 35 f %:. .t. - 89/3-6 7
) torque is required. terminals if voltage drops in the tion, the analytical solution may be l A motor swstched directly on a lines, etc are neglected. preferred. low capacity bus may draw enough As the motor accelerates from current to cause appreciable volt.
~
MATHEMATICAL SOLUTION. Again, standstill, motor current, and, age drop through a supply trans- assume motor reactance equals therefore, voltage drop through the former (Fig.1). To gnalyze stand- motor impedance because of low- transformer decreases. Thus, the , still conditions, consider rootor and locked-rotor power factor. voltage across the motor steadily transformer as pure reactances. An induction motor of 2500 kva increases as the speed increases. ! At standstill (locked rotor), input at full load having a locked- Itaving transformer data available, i motor line ampJi vary with motor rotor current of 6.35 times full- the motor design engineer can terminal voltap. Such a variation load current has a locked impedance predict motor terminal voltsge and. l for a particular squirrel cage motor of 100 % /6.35, or 15.8%. Bring hence, the rnoter speed-torque
- is show'n in Fig. 2. It may be used both motor and transformer im- cu rve.
l to predict the effect of voltage drop pedances (Z) to the same kva base For loads not requiring large ' through a supply transformer. (the 5000-kva transformer base): torques during the starting period, 5 i reduced voltage starting methods I ANALYTICAL SOLUTION. Assume Motor z. 2500 kva base = 15 8% may be used for squirrel ~ cage l transformer primary voltage is 5 k base = 15.8% kve
"","',2._ g motors. Practical and widely-used constant. Because the transformer Tr.,,,,ormer z. sooo.kva base = ay. methods are reactor and autotrans-kva rating is twice the motor full- Motor temmai voitase = former starting.
I Ind kva, a locked-rotor current of * *' 2
" ' # " [* 3 e"' " *' # ,
l 200% at how power factor corres- REACTORS are voltage reducing de-ponds to 100% transformer cur- ! 31.s + s s too = 79.8% vices placed in series with the rent and causes an 8% voltage drop l stator winding of a squirrel cage through the transformer. This is The analytical solution used the motor. They may be shorted out at point A in Fig. 2. The reasoning actual motor locked-rotor curve, a previously chosen speed, time. ' may be extended for larger motor which deviates slightly from a or current value, and the motor currents and results in the dashed linear voltage-current relationship, then operates at its normal full-1 line for transformer secondary due to motor magnetic saturation. voltage characteristics. It is pos- } voltage. At the intersectOn of the In the mathematical solution, the sible to use two or even more short- , dashed and solid line curves, motor motor is assumed to have a linear ing steps during reactor starting. l and tranformer secondary voltages locked-voltage-current relationship. A disadvantage of the reactor
- are equal. The resultant voltage is The difference in the results of the method of starting is the kva con.
l 80% of full voltage. This is the two methods is small. For motors sumed in the reactor itself. Thus, transformer voltage at the motor having a higher degree of satura- where minimum starting kva may { I a tmi nw l
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j Fig.'1./ Motors M, and M. not run- " ning. Motor M3 is 3000 hp, 2500 kva full load, switched directly on bus (see Fig. 2.). 1 Nov. 1964 Powf R ENGINtt0NC 49 l i
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i n v. 1 O. i2Mt ).=::I.No. 89/3 -67 6 < be desired, other methods of re- time for the motor to accelerare duced voltage starting may be autotransformer magnetuing kva, load, coupling, etc., Wk: from more favorable. standstill to full speed. supply line kva in Fig. 5b",equ'ais Reactor application can be shown motor kva and is. therefoie, re-by the following example. Data duced as (V /Vt ): With a re-DISCUSSION OF RESULTS. A single. actor to provide the same voltage from Fig. 3 will be used. Objective: step reactor is preferable for motor reduce motor locked-rotor current, Vu at the lead, the supply line starting. However, the reactor must kva would be reduced only as I tto half the full-voltage locked- be chosen so that the resulting Yu Yo-rotor current Im with a series motor torque exceeds the load Although the discussion and the reactor, a 4 torque through the entire speed elementary circuits in Fig. 5 are Calculations in Table I provide range from standstill to full speed single-phase analyses, these cir-a method of predicting the re-(Fig. 4). If an excess of motor. cuits may be extended to three acto r's effect in reducing motor torque over load torque is not ob. phase. For three-phase motors, the current anel torque. In the table, circuits of Fig. 5 may be con-tained with the chosen reactor obtain cufrent in amps for In ohmic value, the motor will not ac. sidered the customary single-phase (column dl, or for It(column 8), celerate the ! cad to full speed. A equivalent circuits commonly used by multiplying the values shown reactor must then be chosen to in three-phase calculations. Thus, by motor full-load current. Obtain allow more motor current. Greater for three-phase applications, volt-torque in Ibs-ft (columns 3 or 9), motor current permits more motor ages in Fig. 5 are tenninal-to-by multiplying the values shown torque to be developed. During the neutral values. Multiplying any of by motor full-load torque in Ibs-ft. accelerating period, motor torque the voltages by V3 gives line-to-Calculate full-load motor torque at any speed abould be about 25% line three-phase voltage. For three. from the well-known equation: over required load torque. This phase motor problems, line supply (1) percentage is debatable: some engi. kva is then V3 Vs. It. neers may allow a smaller value. Torque developed by a squirrel 3,, ,, : run i ao e = 52t2
#"" **" " := sn Certain applications may require cage motor varies approximately more than one step of starting re- as the square of its terminal volt.
During acceleration of motor act r. Such a situation may occur age. Thus, 50% voltage appied to and connected load, the voltage
- hen one step of reactor will pro.
the motor of Fig. 3 gives the torque across the reactor decreases and vide required current lim't and cune of Fig. 6. across the motor V x increases. torque at standstill, but will not A comparison of autotrans. This tends to maintain motor cur- pr vide adeqcate torque at some former and reactor appliention to rent more nearly constant for a value f speed during acceleration. the example motor of Fig. 3 is large part of the accelerating Should the motor get hung-up shown in Fig. 7. An assumed re-period. Current and torque of the at some speed point and refuse to quired load torque curve, such as motor taken from columns 8 and 9 8ccelerate further, it may be pos-for a fan or pump, is also shown. of Table I are shown in Fig. 4. sible at that point to reduce re- Line kva demand for either type The torque curve of the driven actor ohms in a second step to in- of starting may be obtamed from crease m tor current and torque load depends on the load character- Fig. 4 by multiplying the currents istics. For example, the torque to. accelerate to full speed. With in the figure by V3 times line-to-curve of an unloaded blower or suitable step removal of reactor line supply voltage. pump may have the shape shown hms, the additional motor current in Fig. 4. Other types of driven may n t cause total resultant cur-PART. WINDING STARTING is little loads may have different charac- rent t exceed standstill, or locked used for large motors. A specially teristics. At any speed, the differ- r t r current, which is assumed to designed motor may be started by ence between the motor-developed be the maximum permissible value. connecting only a portion of the torque and the load-required torque The method of calculation for stator winding to the full-voltage represents torque available to ac- m te than one nactor step a the power supply. A common arrange-celerate the inertia of all the ro- same as outlined for the smgle step. ment is to wind the motor with two tating parts. Acceleration time may . parallel circuits.
- t. hen be calculated from the for- AUTOTRANSFORMER STARTING has At start, full voltage is impressed mula: kva and current reduction ad- across one parallel only. Motor im.
vantages over the reactor method, pedance is greater than for the A motor supplied at full voltage is entire winding and both motor w i A rpm shown in Fig. 5. The same motor O' 30s a T... '" starting current and torque are supplied through an autotrans- reduced. Motor current may be for:ner to provide, say 50% of full , w[=7 are time emervel n> of en ia seconds rotstmg parts voltage, is shown in Fig. Sb. At the' from 60 to 70% or normal l'ocked ' rotor full winding value. The motor rom = So**d int"v ia "vo'ut'*a8 o'r reduced voltage, motor kva is the , torque cune may have pronounced T. , everese torcue, los-f t. for rpm product of the reduced voltage and cusps. Thus the motor may ac-current, that is, kva is reduced to . ce)erate its connected load only up From Equation (2), Table II (0.50)* or 25% of the full-voltage to the speed at which the cusp may be constructed to show se- value. Thus, load kva in Fig. Sb occurs. To reach full speed use the , quence of calculations to detennine vsries as (V M /Vt.)
- Neglecting full stator winding. END So Powf R ENG;NEEPING NOV. 1964
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' Fig. 5. (A) Motor connected directly to power ' supply. ' ] reactor to provide a locked-rotor current cf 50% of (B) Motor supplied through autotransformer. ' full voltage locked rotor current without reactors. Load. ..
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FULt. 'tDAo'cuRRDft Fig. 6. Mctor torque and line. current curves with auto. .' Fig. 7. Torque arid current to or_ g Autoa transformer on 50 i trin l transformer of Fig. Multiply i . x 2 to obtain motor current (autetransformer t SB to provide 50% of full: voltage. ?'of autotransforiidr% : rieglected)"j ( volta'g tap d eaWo~ cuirrent'I n:nddes Q p.h
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Nov. 1964 power ENGINEERING 51
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I i Calc. For Evatustion of 460v Diesel Generator Cooling Calc. No. 8913 67-19-2 l SARGENTi LUNDY water en mininun starting voltage ENGINEERS _ Revd U k h 9 X Safety-Related Non-Safety-Related Page El of E5 1 Client cessermeetth Edison Company Prepared by Date Project Quad Cities Unit 1. Div.!!; Units 1&2, Div.I Reviewed by Date Proj. No. 8913-67 Equip. No. Approved by Date
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F ATTACHMENT E WALKDOWN DGCWP MOTOR DATA l l l 1 I 1 m
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g: 1849 _ SARGWB JYJY i" n S ' t ENGIN EE AS *^ ^ " (
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Quad Cities Nuclear Power Station *C3 i
; ., 22710 206 Avenue North >
Cordova, Illinois 61242 ; Tax: (309) 654-2650
/ :
, Cal . No. 89 f 3 --67-< 9-J i
~ '
Date: - E"' O ' $$. I f' 1/ & Time: I i Psie E2 of E5 ; Proj. No. 89f 3 -67 I ro: R 66.ER SCH t AV'o d l Location: O{
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Extension: b b-From:
- l comments: -
l 1 . Cover sheet plus pages a call upon receipt: yes 'no For verification or tr'ouble call: (309) 654-2241 extension 2842, (309) 654-2241, extension 2598
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