ML19209C229
| ML19209C229 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 02/06/1978 |
| From: | Greiman C, Kreider H, Joshua Wilson UNITED ENGINEERS & CONSTRUCTORS, INC. |
| To: | |
| Shared Package | |
| ML19209C228 | List: |
| References | |
| NUDOCS 7910120225 | |
| Download: ML19209C229 (51) | |
Text
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REPORT CN VOLTAGE DROP STUDY FOR CAROLINA POWER & LICHT COMPANY BRUNSWICK STEAM EI.ECTRIC PTRIT UNIT NO. 2 BY UNITED ENGINEERS & CONSTRUCTORS INC.
3 a
Date: December 2, 1974 UE&C J.O. No. 9527.018 Rev. 1:
February 6,1978
//. 8 h
Prepared by:
J. H. Wilson - RE Reviewed by:
MA/.svA
- 1. Benks - SDE Approved by: d h. b n
C. D. Greiman - SDE Approved by:
/A _
l H. C/
[ider*PM A
li'4 224 7910120
_ av INDEX Page No.
1 1.0 PURPOSE 2
2.0
SUMMARY
OF RESULTS 2&3 2.1
. Source Voltage Restrictions' 4
2.2 Tap Settings._
2.3 Load Shedding 5
i 6
3.0 DISCUSSION 3.1 Bases for Comparison 6
7 to 18 3.2 Criteria 3.3 Method of Analysis 18 & 19 4.0 ANALYSIS OF ALTERNATES 20 20 4.1 No Logic Change
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-4.2 Load Shedding 20
5.0 REFERENCES
21 to 23 6.0 APPENDICIES 24 Al to A25 Appendix A B1 to B8 Appendix B C1 to C58 Appendix C INDEX ii'4 22e3
Ih.
1.0 PURPOSE 1.- 1 This study is an analysis of the voltage regulation performance of the Brunswick Steam Electric Plant auxiliary distribution system.
Firs t, the optimum transformer tap settin'gs were determined for the various auxiliary transformers.
Second', using these tap settings, the voltage H
L ranges at the various auxiliary load terminals were determined, for the expected generator and 230KV switchyard voltage variations, and for postulated variations in load conditions. Third, limitations on generator and 230KV switchyard voltage variations were determined.
I These limitations were escablished such that under expected normal operating conditions equipme'nt, design lifetimes would not be decreased.
.Under emerge:1cy,cperating conditions the limits were set to provide
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proper operation of all safety-related equipment.
i 3
A A
15 3
3
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3 3
1i'4 226 n.
I A
}
2.0 SITMMARY OF RESULTS 2.1 SOURCE VOLTAGE RESTRICTIONS g
2.1.1 Criteria w
For those operating conditions which are expected to continue for long periods of time, the voltage criteria at the load buses were chosen to maximize motor life (907. to 1107. of the',
-)
_c:otor rated voltage), and the source voltage restrictions for wi these cases were based on such criteria.
(See Article 3.2.1).
)
For the emergency operating conditions, the voltage criteria were chosen to ensure that all safety-related equipment would function, (857. to 1107, of the motor control center voltage)',
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with the possibility that motor life might be adversely affected if operation beyond either voltage limit continued for a long period of time.
(See Article 3.2.1).
For all motor starting cases, both accident-related and nor=al operation, the voltage 9
J criteria were chosen *:o ensure that the motors in question would start (707. or 757. for 4000-volt safety-related motors, 857. for K
.all 460-volt motors and 4000-volt BOP motors), and that the 480-volt starters would not drop out (707.).
It is recom= ended, for the operating conditions shown, that the source voltages be held within the restrictions tabulated in 4.1.2 below.
3
).
3 II'4 227
_2-W~
i
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2.1.2 GDIERATOR AND SWITCHYARD VOLTAGES,
3RUNSWICK STEAM ELECTRIC PIANT, UNIT NO, 2 VOLTAGE DROP STUDY OPERATING VOLTAGE LIMITS BASE PER-UNIT ACTUAL l
CASE BUS VOLTAGE VOLTAGE VOLTAGE LIGHT LOAD, UAT i
i UEN 24966.
1.6365 24876. Max.
SCREEN WASH PUMP 2A START, UAT FULL LOAD h
, ei GEN 24606.
6.9666 23198. Min.
~
LIGHT LOAD, SAT SWYD 23ddd6.
1.0696 232968.
Max..
i L
SAT LOADS, UNIT LOADS FED FROM UAT SWYD 230096.
1.6138 233185. Max.
I SCREEN WASH PUMP 2A START, SAT EULL LOAD
}
SWYD 230000.
6.9727 223711. Min.
LOCA START SWYD 230096.
W.9115 209646. Min.
2XLOCA RUN, REACIOR BUILDING CLOSED COOLING WATER PUMPS 2A & 2C STAR'I SWYD 230606.
6.9556 219655. Min.
}
LOCA START, LOAD SHEDDING SWYD 236666.
0.8854 263638.
Min.'
2XLOCA RUN, LOAD SHEDDING, RBCC',& 2A AND 2C START SWYD 230660.
6.9348 214999. Min.
1 3
11'4 228
2.2 TAP SETTINGS Recous:: ended transformer high-voltage winding tap settings are as follows:
UAT 1.00
.(base)
.975
(-2.57.)
Unit Substations 2E
.95
(-57.)
2F
.95
(-57.)
E7
.95
(-57.)
^
E8
.95
(-57.)
2SY
.975
(-2.57.)
Connon D
.975
(-2.57.)
2L 1.00 (base) 4L
.975
(-2.57.)
The above tap settings will provide adequate voltage at the equipment terminals under the operating conditions evaluated and were used in calculating the source voltage limits govern in Table 2.1.2.
3 1
3 3
A.
29
^
s.
2.3 LOAD SHEDDING LOCA condition studies were performed using two sets of parameters.
In one case all BOP loads which were running before the start of an accident continued to run after the LOCA signal. Calculations for this case are noted as LOCA, 2X LOCA, etc. The second case involves automatic shedding of all BOP loads on the 4 KV buses in the event of a LOCA in order to improve the voltage performance of the emergency system with off-site power available. Calculations for this case were made under the load shedding titles. Load shedding offers an improvement g
of approximately 27. in the minimum permissible 230 KV switchyard voltage which must be maintained'during the accident.
t e
11'4 230 3.0 DISCUSSION 3.1 BASES FOR COMPARISON 3.1.1 Tap Settings Thecriterionusedtochoosetransformertapsetti$1gswasto determine, for each set of tap settings, the maximum 230 KV switchyard voltage required to naet the load voltage requirements. To accomplish this, for each tap setting combination,' voltage dr'op calcul'aticns were performed fir Itite SAT Light Load case to determine the maximum switchyard voltage'. Note thai:, because this case's loads do not depend on the presence or absence of Load Shedding, the transformer tap decision is also independent of Load Shedding. The tap settings chosen are those which most closely spproach the desired switchyard operating voltage range of 94.5 to 1017..(1)
The tap settings chosen c:ust also provide proper load voltages over the entire range of generator voltages from light 1;_. to
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full load.
(See Article 3.-221). Tha recamnended tap settings do this.
(See Article 2.2).
3 1
1 1 1 1i4 231
h s
t
)
- 3. 2 CRITERIA 3.2.1 Allowable I.oad Voltage Ranges
]
3.2.1.1 Motor voltage criteria vary with the class of the motor, 1
m.
as well as the vol'tage_ rating. For 4000-volt motors,.
non-Class-IE, the requirements are:(2)(3')
Running continuoue.
4000-V base 907.-1107.
3600-4400V W
Starting 4000-V base 857.-1107.
3400-4400V T
Running transient 4000-V base 857.-1107.
3400-4400V a,
For 4000-volt motors, Class IE, specified and supplied by
]
G.E., the requirements are:(4) (5)
Running continuous 4000-V base 907.-1107.
3600-4400V Starting 4000-V base 70%-110%
2800-4400V J
Running transient 4000-V base 707.-1107.
2800-4400V For 4000-v le motors, Class IE, specified by UE&C, the requirements are:(6)
Running continuous
--4000-V base 907.-1107.
-3600-4400V Starting 4000-V base 757.-1107.
3000-4400V Running transient 4000-V base 757.-1107.
3000-4400V q
For 460-volt motors, the requirements for normal motor life are:(7)
Running continuous 460-V base 907.-1107.
414-506V Starting 460-V base 857.-1107.
391-506V
-4 Running transient 460-V base
- 70.77.-1107.
325-506v 3
J (8)
Motor control centers were specified for 480 volts, and the minimum hold-in voltage requirement for the starters is 707. of
(
480 volts,or 336 volts.
The minimum pickup voltage requirement for starters is 857. of 480 volts, or 408 volts.
1,^
11^4 232
I 3.2. CRITERIA (Cont'd) 3.2.1 Allowable Load Voltage Ranges (Cont'd) 3.2.1.2 For the normal operation cases, that is, for the UAT Full Load, SAT Full Load, UAT Light Load, and SAT Light Load cases, the load voltage restrictions are based on the rated continuous running voltages of motors to achieve normal lifetimes (907,to 1107,of rated voltage,
.}i 4000V or 460V).
(See Articles 3.2.3 for definitions of these cases).
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3.2.1.3 I
operation at voltages higher 'than those given would probably result in abnormal heating of motors due to saturation.
This heating would shorten the Mean Time Betwcen Failures for the motors so exposed. The MIBF could be_ expected to decrease with increased time at hig voltages, and to decrease rapidly with increased voltage levels above the voltage where saturation begins. At the other extreme, because the speed of an induction motor varies greatly with changes in frequency and only slightly on voltage, the load speed remains essentially constant with decreasing 3
voltage. Therefore, the load power and electrical volt-I ampere requirements remain essentially constant for decreasing
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motor voltage, and the current increases. Below the limiting i
2 values shown in Article 3.2.1.1, the I R losses due to this increased current could be expected to produce abnormal heating and again result in reduced MTBF's. Both of these effects are long-term results of high-or low-voltage operation, hence these limiting values apply only to I 4,.
i l 4
233
1 3.2. CRITERIA (Cont 'd) 3.2.1 Allowable Load Voltage Rdnees (Cont'd) 3.2.1.3 operating conditions expected to occur for a substantial portion of the forty-year plant lifetime.
[Since high voltages would occur with most motors '
[ stopped, while low voltages would occur with most' motors running and therefore more motors would be b
._. exposed to the potentially damaging condition.
Thus the decrease in reliability due to extended low-voltage operation would be much more severe than that due to extended high-voltage operation.
3.2.1.4 or 409 volt motor starting cases, the criteria are simples. At the 4160-volt level, the limitation is maintaining the minimum motor voltages cited in' Article 3.2.1.1.,' Since motors can, without stalling, ride through a transient voltage dip at a voltage sufficient to start them, the limiting condition for the 4160-volt level is to maintain sufficient voltage w
m to start the motors. At the 480-volt level, the e,..
4r limitation is that the starters of motors already m
running must not drop out when a 4000-volt motor
'r starts. Starters are not guaranteed to hold in at a
voltages below 707. of their rated coil voltage, or in
VOLTAGE DROP STUDY A, APPEtOIX A SAT di CIRCULATING WATER PUMP 23 MOTOR STARTING ged t M (Fit,. No. A13) gs MINIMUM BUS NAMES 230 KV SWITCHYARD .95 4160 VOLT BU" 2B .9348 2D, COMMON B, E3 & E4 .8642 4160 VOLT BUS 2C3 480 VOLT UNIT SUBSTATION Z7 .847 480 VOLI UNIT SUBSTATION 2E .8559 480 VOLT UNIT SUBSTATION 2F .8515 480 VOLT UNIT SUBSTATION E8 .845 480 VOLT UNIT SUBSTATION 2SY .8747 480VOL5UNITSUBSTATIONCOMMOND .8667 480 VOLT UNIT SUBSTATION 2L .8544 480 VOLT UNIT SUBSTATION 4L 8656 4000V CIRCULATING WATER PUMP MOTOR 2B .8721 NOTE: ALL VOLTAGES ARE ON THE BASE VOLTAGE SHOWN IN THE LEFI HAND COLUMN. 3 ] li'4 264 3 A15 r h VOLTAGE DROP SRTDY APPENDIX A o SAT SCREEN WASH PUMP 2A STARTING (Fig. No. A14)
- T BUS NAMES MINIMUM Ji 230 KV SWITCHYARD
.9727 -3 4160 VOLT BUS 2B .9623 4160 VOLT BUS 2C, 2D, E3, E4 & COMMON B .9319 480 VOLT UNIT SUBSTA". TON E7 .8807 480 VOLT UNIT SUBSTATION 2E .8318 a 480' VOLT UNIT SUBSTATION 2F .9279 480 VOLT UNIT SUBSTATION E8 .9221 480 VOLT UNIT SUBSTATION 2SY .9451 480 VOLT UNIT SUBSirfI,0N COMMON D .9377 480 VOLT UNIT SUBSTAI1G 2L .9229 a 480 VOLT UNIT SUBSTATION 4L .9367 480 VOLT MOTOR CONTRt'. CENTER 2PA .8299 460V SCREEN WASH PUMP 2A .8502 'I NOTE: BASE VOLTAGES THOWN IN THE LEFI HAND COLUMN. A .d 'i'4 265 a A16 w VOLTAGE DROP STUDY APPENDIX A SAT TURBINE BUILDI'IG CLOSED COOLING WATER PUMP 2A MOTOR STARTING (Fig. No; A15) 4 BUS NAMES MINIMUM 230 KV SWITCHYARD .95 4160 VOLT BUS 2B .9379 4160 VOLT BUS 2C, 2D, E3, E4 , i & COMMON B .9061 480 VOLT UNIT SUBSTATION E7 .8947 } 480 VOLT UNIT SUBSTATION 2E .8579 480 VOLT UNIT SUBSTATION 2F .8989 v 480. VOLT UNIT SUBSTATION E8 .8928 m 480 VOLT UNIT SUBSTATION 2SY .9182 w 480 VOLT UNI *" SUBSTATICN COMMON D .9106 480 VOLT UNIT SUBSTATION 2L .8968 480 VOLT UNIT SUBSTATION 4L .9096 a 480 VOLT MOTOR CONTROL CENTER 2TJ .8265 460V TURBINE BUILDING CLOSED COOLING f WATER PUMP 2A .8498 T 4 NOTE: ALL VOLTAGES ARE ON Tr. BASE VOLTAGE SHOWN IN THE LEFI HAND COLUMN. 1' s 1 i r A17 Y t -p VOLTAGE DROP STUDY APPENDIX A SAT TURBINS BUILDING CLOSED COOLING WATER PUMP 2B START (Fig. No. A16) o 9 BUS NAMES MINIMUM 230 KV SWITCHYARD .9623 m 4160 VOLT BUS 2B .9511 e 4160 VOLT BUS 2C, 2D, E3, E4 & COMMON B .92 480 VOLT UNIT SUBSTATION E7 .9104 480 VOLT UNIT SUBSTATION 2E .9185 480 VOLT UNIT SUBSTATION 2F .8684 m 480 VOLT UNIT SUBSTATION E8 .9085 480 VOLT UNIT SUBSTATION 2SY .9326 480 VOLT UNIT SUBSTATION COMMON D .9252 ~' 480 VOLT UNIT SUBSTATION 2L .9108 480 VOLT UNIT SUBSTATION 4L .9242 480 VOLT MOTOR CONTROL CENT.R 2TH .8382 460 V TURBriE BUILDING CLOSED C00LEIG .8501 WATER PUMP 2B m NOTE: ALL VOLTAGES A.<E ON THE BASE VOLTAGE SHOWN a' THE LEFT HAND COLUMN. 41 l 11'4 267 a A18 i A - ~ w w -w, VOLTAGE DROP STUDY a, APPENDIX A l SAT 4 SCREEN WASH PUMP 2B STARTDIG (Fig. No. A17) m BUS NAMES MINIMUM 230 KV SWITCHYARD .9638 4160 VOLT BUS 23 .9527 4160 VOLT BUS 2C, 2D, E3, E4 & COMMON B .9222 480 VOLT UNIT SUBSTATION E7 .9126 48U VOLT UNIT SUBSTATION 2E .9207 480 VOLT UNIT SUBSTATION 2F .9167 ~' 480 VOLT UNIT SUBSTATION 2SY .8679 480 VOLT UNIT SUBSTATION COMMON D .9347 480 VOLT UNIT SUBSTATfCN 2L .1' .9273 480 VCLT U!CT S'J3STATICN 4L 3263 480 VOLT MOTOR CONTROL CENTER 2PB .8319 ' ~ 460 V SCREEN WASH PUMP 23 .8501 I 4 NOTE: ALL VOLTAGES ARE ON IHE BASE VOLTAGE SHOWN IN THE LEFI HAND COLUMN. i 11'4 268 4 s A19 l ( VOLTAGE DROP STUDY 4 APPENDIX A I LOCA START NO LOAD SHEDDiriO (Fig. No. A18) 4 BUS NAMES MINIMUM f 230 KV SWITCHYARD .9115 4160 VOLT BUS 2B .9218 4160 VOLT BUS 2C, 2D, EI, E4 & COMMON B .7577 t 480 VOLT UNIT SUBSTATION E7 .7457 l 480 VOLT UNIT SUBSTATION 2E .7151 480 VOLT UNIT SUBSTATION 2F .7079 j 480 VOLT UNIT SUBSTATION E8 7366 I 480 VOLT UNIT SUBSTATION 2SY .7603 1 480 VOLT UNIT SUBSTATION COMd.ON D .7485 I 480 VOLT UNIT SUBSTATION 2L .741' 480 VOLT UNIT SUBSTATION 4L .7468 4000 VOLT CORE SPRAY PUMP 2A .7735 4000 VOLT RHR PUMP 2A .7807 j 4000 VOLT CORE SPRAY PUMP 2B .7705 4 4000 VOLT RHR PUMP 2B .7777 ~ I 4 NOTE: BASE VOLTAGES FOR ALL LOADS ARE THE RATED VOLTAGES SHOWN I IN THE LEFI HAND COLUMN. 4 ] 11'4 269 k A20 e .~, Mr Ni VOLTAGE DROP STUDY APPENDIX A LOCA RUN -o NO LOAD SHEDDING (Fig. No. A19) ~ BUS NAMES MINIMUM 230 KV SWITCHYARD .9291 4160 VOLT BUS 2B .9478 4160 VOLT BUS 2C, 2D, E3, E4 & COMMON B .8843 '4 480 VOLT UNIT SUBSTATION E7 .8876 480 VOLT UNIT SUBSTATION 2E .8637 .a 480 VOLT UNIT SUBSTATION 2F .8582 480 VOLT UNIT SUBSTATION E8 .8804 ~ 480 VOLT UNIT SUBSTATION 2SY .8927 ~ 480 VOLT UNIT SGBSTATION COMMON D .8828 480 VOLT UNIT SUBSTATION 2L .8711 ??O VOLT UNIT SUBSTATION 4L .8814 andi NOTE: ALL VOLTAGES ARE ON THE BASE VOLTAGE SHOWN IN THE LEET HAND COLUMN. .q P M 11'4 270 a 2 l 1 ? VOLTAGE DROP STUDY ~ APPENDIX A LOCA WITHOUT LOAD SHEDDING REACTOR BUILDING CLOSED COOLING WATER PUMPS STARTITC (Fig. No. A20) s 7 4 BUS NAMES MINIMUM .9509 230 KV SWITCHYARD i 4160 VOLT BUS 2B .97 l 4160 VOLT BUS 2C, 2D, E3, E4 & Com0N B .9049 .8776 480 VOLT UNIT SUBSTATION E7 1 l 480 VOLT MCT SUBSTATION 2E .8873 480 VOLT UNIT SUBSTATION 2F .882 ~ 480 VOLT UNIT GUBSTATION E8 .9035 l 480 VOLT UNIT SUBSTATION 2SY .9142 480 VOLT UNIT SUBSTATION COMMON D .9045 480 VOLT UNIT SUBSTATION 2L .8921 480 VOLT UNIT SUBSTATION 4L .9032 480 VOLT MOTOR CONTROL CENTER 2XE .8267 460V REACTOR BUILDING CLOSED COOLING WATER PUMP 2A .8501 460V REACTOR BUILDING CLOSED COOLING WATER PUMP 2C .8535 a dI ALLVOLTAGESAREONTHEBASEVOLTAGESHOWNINTHbLEFTHAND f NOIE: j COLUMN. 1 11'4 271 2 h A12 6 ~krit l' C* e c Geu : rac r .} y_ g., t u V.. < - i -j ' ' } VOLTAGE DROP STUDY ~ APPENDIX A 2X LOCA START NO LOAD SEEDDING (Fig. No. A21) BUS NAMES MINIMUM m 230 KV SWITCHYARD .9593 4160 VOLT BUS 2B .9673 4160 VOLT BUS 20, 2D, E3, E4, & COMEN B .758 480 VOLT UNIT SUBSTATION E7 .7459 480 VOLT UNIT SUBSTATION 2E .7154 480 VOLT UNIT SUBSTATION 2F .7082 480 VOLT UNIT SUBSTATION ES .7368 480 VOLT UNIT SUBSTATION 2SY .7605 480 VOLT UNIT SUBSTATION COMMDN D .7487 480 VOLT UNIT SUBSTATION 2L .7421 m 480 VOLT UNIT SUBSTATION 4L .7471 4000 VOLT CORE SPRAY PUMP 2A .7737 4000 VOLT RHR PUMP 1A .7798 4000 VOLT RHR PUMP 2A .7809 + 4000 VOLT CORE SPRAY PUMP 23 .7708 7 4000 VOLT RER PUMP IB .7311 q-4000 VOLT RHR PUMP 2B .7709 4 'l NOTE: ALL VOLTAGES ARE ON THE BASE VOLTAGE SHOWN IN THE LEFI HAND I COLUMN. 4 m i ^23 4 272 4 i i e ~ VOLTAGE DROP STUDY APPENDIX A 2X LOCA RUN NO LOAD SHEDDING (Fig. No. A22) 1 BUS NAMES MINIMUM 230 KV SWITCHYARD .9351 q 4160 VOLT BUS 23 .9534 } 4160 VOLT BUS 2C, 2D, E3, E4 & COMMON B .8843 480 VOLT UNIT SUBSTATION E7 .8876 ~1 d 480 VOLT UNIT SUBSTATION 2E .8636 9 480 VOLT UNIT SUBSTATION 2F .8581 l 480 VOLT UNIT SUBSTATION E8 .8803 f 480 VOLT UNIT SUBSTATION 2SY .8926 480 VOLT UNIT SUBSTATION COMMON D .8827 480 VOLT UNIT SUBSTATION 2L .871 480 VOLT UNIT SUBSTATION 4L .8814 NOTE: ALL VOLTAGES ARE ON THE BASE VOLTAGE SHOWN IN THE LEFI HAND COLUMN. m 4 NI a o 'l4 273 A24 VOLTAGE DROP STUDY APPENDIX A 2X LOCA WITHOUT LOAD SHEDDING REACTOR BUILDING CLOSED COOLING WATER PUMPS 2A AND 2C START (Fig. No. A23) MINIFUM BUS NAMES .955 230 KV SWITCHYARD .9739 4160 VOLT BUS 2B 4160 VOLT BUS 2C, 2D, E3, E4 & COMMON B .9048 480 VOLT UNIT SUBSTATION E7 .8775 480 VOLT UNIT SUBSTATION 2E .8872 480 VOLT UNIT SUBSTATION 2F .8819 j 480 VOLT UNIT SUBSTATION E8 .9033 480 VOLT UNIT SUBSTATION 2SY .9141 8 480 VOLT UNIT SUBSTATION COMMON D .9044 j 480 VOLT UNIT SUBSTATION 2L .892 1 480 VOLT UNIT SUBSTATION 4L .9031 480, VOLT MOTOR CONTRCL CENTER 2%E .8266 460V REACTOR BUILDING CLOSED COOLING WATER PUMP 2A .85 a 460V REACTOR BUILDUiG CLOSED COOLEIG 9 WATER PUMP 2C .8534 J NOTE: ALL LOAD VOLTAGES ARE ON THE BASE VOLTAGE SHOWN IN THE LEFT HAND a COLUMN. m JI 1i 1 dh ] A25 14 274 '