ML20065Q064
| ML20065Q064 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 10/19/1982 |
| From: | Baynard P FLORIDA POWER CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| 3F-1082-09, 3F-1082-9, NUDOCS 8210260436 | |
| Download: ML20065Q064 (45) | |
Text
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' b (h 0" Fkxida Power
' " " dctober 19,1982
- 3F-1082-09 File:
3-0-3-a-3 3-E-3 Mr. John F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Crystal River Unit 3 DocNt No. 50-302 Operating License No. DPR-72 Adequacy of Station Electric Distribution System Voltage
Dear Mr. Stolz:
By letter dated February 19,1982, Florida Power Corporation submitted calculated and measured bus voltages to demonstrate the adequacy of the Crystal River Unit 3 Electrical Distribution System. The calculated voltages used several assumptions that did not adequately model the measured conditions.
During subsequent telephone conversations, Florida Power Corporation agreed to revise our calculations to more accurately model our system. The following attachments are included:
1.
Comparative Voltage Table, 2.
Explanation of Difference Between Original Calculation and Present Calculations, and 3.
Engineered Safeguards Buses Voltage Calculations The first calculations were made on the l' asis of the 4160/480 volt (V) transformers being on the nominal tap. The revised calculations were made for a tap setting to give a 25% voltage boost; this results in the 480V switches and motor control center voltages being increased by approximately 25% This assumption should satisfy the NRC concern that the measured voltages were too high and provicie assurance that we will not exceed the voltage limits. The starting voltage for the calculations was the same as that for measured voltages, i.e.,244.8 kV.
If the starting voltage were 240kV-l%% = 236.4kV (lowest 240kV system voltage),
1 then the calculated voltages would be obtained to a very close approximation by multiplying the calculated voltages in the attached table by.965686.
B210260436 821019 e
PDR ADOCK 05000302 I
L P
PDR General Office 3201 inerty-fourtn street soutn. P O Box 14042, st Petersburg. Flonda 33733 e 813-866-5151 J
a e
Mr. John Stolz
- 3F-1082-09 Page 2 The discrepancy between calculated and measured voltages is most probably due to the as-measured bus loads being appreciably lower than bus loads used in the calculation.
The calculated load on the 4160V winding of the Startup Transformer was approximately 31 Mega volt amps (MVA); the forced-oil-and-air-at-650C rating of this winding is 28 MVA. It is improbable that the measurements were made with a load as great as 28 MVA. The calculated load on Engineered Safeguards Auxiliary Transformer 3A was approximately 1.15 MVA, the oil-air rating of the transformer being 1 MVA.
Calculated loads in many c.ses were taken as rated loads of equipment. Also, the condition used in the calculations was that of maximum plant bus loading including maximum Engineered Safeguard loads. Previous calculations were approximate and are superseded by the present calculations from which the Comparative Voltage Table is compiled; therefore, relay settings should be based on the present calculations.
The review of these calculations and the assessment of effects on the system that could be caused by changes in the relay settings has involved considt.rable engineering effort. Fitting this work into the schedule of preparing for our next outage has caused considerable delay in submitting the results of these revised calculations.
Florida Power Corporation will install the protection relays during the Spring 1983 Refueling Outage. The proposed trip setpoint is 3780V with a maximum value of 3866V and minimum value of 3763V. This will allow a 4.2% drop between the 4160V buses and 480V motor control center.
Florida Power Corporation plans to perform additional calculations at raised tap settings to improve the voltage drop to 2% We plan to monitor the performance of these relays and to make additional voltage caiculations before finalizing the Technical Specification Change Request. Florida Power Corporation will~ submit the schedule for final calculations, voltage measurement checks, and technical specification submittal upon development and approval of that schedule.
Very truly yours,
'*rf k W Dr. Patsy Y. Baynard Assistant to Vice President Nuclear Operations WRK/myf
a COMPARATIVE V0LTAGE TABLE CR-3 START-UP TRANSFORMER MEASURED VALUES PLANT AT FULL LOAD-STEADY BUS CALCULATED VOLTAGES STATE CONDITIONS Original Value Present Value Numerical Value (2/19/82)
(10/6/82) 230 kV GRID 243.6 kV 244.8 kV 244.8 kV 4160 V SWGR ES BUS 3A 4276 V 4108 V 4183 V ES BUS 3B 4276 V 4108 V 4179 V 480 V SWGR ES BUS 3A 489 V 458 V 472 V ES BUS 3B 489 V 460 V 475 V MCC 480 V ES 3Al 489 V 456 V 469 V 3A2 489 V 455 V 468 V 3AB 489 V 454 V 468 V ES 3B1 489 V 457 V 472 V 3B2 489 V 458 V 471 V
F e
EXPIANATION OF DIFFERENCE BETWEEN ORIGINAL CALCULATIONS AND,PRESENT CALCULATIONS Errors in Original Calculations 1.
The H-Y Impedance of the Startup Transformer was taken as 7.96% from our early nameplate drawing instead of the later value of 8.6%.
2.
Cable impedances were neglected.
The above errors would result in the calculated voltage drop being smaller than would actually be the case.
Difference In Methods of Calculation Original Method Loads were expressed in terms of current rather than impedance. Voltage drops were calculated by multiplying currents by impedances, and then subtracted from
-the voltage on the high side of the impedance through which the inad current passed.
Loads were expressed in terms of the transformer output voltage vector, yet when calculating this voltage, the input voltage vector was taken as the reference vector.
yH
,V -YY Vg = High side voltage vector H
Vg = Low side voltage vector This is the pf angle which should have been used.
'('.f.
angle of load p
i The correct pf angle being greater than the load pf angle, would result in a greater voltage drop.
This occurs in two cases, a.
for the Startup Transformer b.
for the 4160/480V transformers l
so that when calculating the voltage drop through the two transformers, a double error is incurred.
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Present Method This is the voltage divider method and avoids the error caused by using too small a pf. angle.
Loads are expressed as impedances.
The principle is as follows:
h Voltage on high Z = Impedance of load Z
side of transformer g
T Zy = Impedance of transformer Bus Voj.tage -
Impedances expressed vectorially Zg V.
gt Zt Bus Voltage =
x Voltage on high side of transformer.
Z +ZT L
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ENGINEERED SAFEGUARDS 2
BUSEC VOLTACP CAT CM ATIONS 04 '011 113 Gilbert Associates,Inc.
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Purpose:
To compare Engineered Safeguards Bus Voltages with those measured by Florida Power Corporation.
Sources of Information: These are identifed at the appropriate part of the calculations.
Computer Calculation: Not applicable Assumptions: These are identified at the appropriate part of the calculations.
Indetification of End Results: The comparison of calculated and =casured voltages is shown in the Table at the end of the calculations.
The actual one line diagram used (except for impedance values) is given on page 37 of Calculations 11/20/79 in " Adequacy of Station Electric Distribution Voltages -
Crystal River 3".
4.16 KV LOADS Rated KVA taken from " Crystal River Unit 3 - Auxiliary Loading pages 3 and 4.
Number of motors running taken from those in " Adequacy of Station Electric Distribution voltages" pages 4, 5 of Calculations 10/21/80. KVA calculated from latest current information shown on the motor data sheets.
Power factors were also taken from motor data sheets; the power factor of the Auxiliary Building Exhaust Fans, since they were running at just over 50% load was estimated from the full load power factor.
As the impedance of an induction motor will vary as the voltage applied to the terminals, the terminal voltage was estimated at.99 of 4.16 KV (base voltage) from l
preliminary calcuations.
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BUSES VOLTAGE CALCULATIONS 04-5011-113 Gdbert Assecestes, bec.
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Base Voltage In calculating the impedance from rated KVA, in terms of the base !!VA, motor KVA has Base Voltage been multiplied by (Actual Terminal Voltage )2,sinceimpendanceisgportionedto the inverse of the Motor impedancs is then Base MVA Motor MVA Base MVA has been taken throughout as 100.
Converted to KVA Motor 4.16KV Base Unit Bus 3A Rated Running pf KW KVAR Volts MW MVAR MVA i
- 1. CW Pump 3A 1700 1700
.822 1397 968
.99
- 2. CW Pump 3C 1700 1700
.822 1397 968
.99
- 3. Sec. Service Closed 317 317
.875 277 153
.99 Cycle Pp. 3A
- 4. Feedwater Boster 21' '
2110
.91 1920 875
.99 Pp.
- 5. Condensate Pp. 3A 1750 1750
.9 1575 763
.99
- 6. Normal Nuc. Serv.
328 328
.843 277 176
.99 Sea Water Pp. 3 I
- 7. Aux. Bldg. Exh.
180 100
.85 85 53
.99 7.0694.0368.14) 8.
6928 3956 l
Unit Bus 3B
- 9. CW Pump 3B 1700 1700
.822 1397 968
.99
- 10. CW Pump 3D 1700 1700
.822 1397 968
.99
- 11. Sec Service 317 317
.875 277 153
.99 Closed Cycle Pp. 3B
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- 12. Feedwater Booster 2110 2100
.91 1920 875
.99
- 13. Condensate Pp. 3B 1750 1750
.9 1575 763
.99
- 14. Norm. Nuc. Serv.
227 227
.843 277 176
.99 CCC Pp. 3
- 15. Aux. Bldg. Exh.
180 100
.85 85 53
.99 16.
Fan 38 6851 3888 6.99 3.967 8.0372 Z
R + jX Unit Bus 3A 12.285 29.720 10.669 + j 6.0904 Unit Bus 3B 12.442 29.580 10.82 + j 6.142 Converted to KVA Motor 4.16KV Base ES Bus 3A Rated Running pf KW KVAR Volts MW MVAR MVA l
Make UP Pump 3A 588 588
.926 545 222
.99 Reactor Bldg. Spray 215 215
.925 199 82
.99 Pump 3A Decay Heat Pump 3?9 339
.921 312 132
.99 Emerg. N. S. Sea Water 643 643
.87 559 317 99 Pump 3A 1
j Emerg. N. S. CCC Pump 620 620
.89 552 283
.99 3A Decay Heat Serv. Sea 285 285
.827 236 160
.99 Water Pp.
2403 1196 2.452 1.22 2.7387 l
ENGINEERED SAFEGUARDS Gilbert Associates. Inc.
BUSEF VOLTAGE CALCULATIONS 04-5011-113 f
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40 MICROFILMED PAGES CALCul.ATION o,,om,,o, fg, g ontE 7/8/82 l
Z R + jK ES Bus 3A 36.513 26.45 32.691 + j 16.264 ES Bus 3B 36.513 26.45 32.691 + j 16.264 6.9 KV LOADS Only the Reactor Coolant Pumps.
Volts = 6.6 KV FLC = 685 amp. 1250 rap synchronous KVA Input = / 3 x 6.6 x 685 = 7330 hp = 9000 kW Output = 9000 x.746 = 6714 4
pf x efficiency =
=.8575 0
Efficiency must be less than unity, so that pf must be greater than.8575.
Examine 4 KV Motors hp rpm efficency pf 2000 1200
.946 9
1750 257
.934
.822 low speed, not fair comparison 400 1800
.938
.921 800 1800
.936
. 89 2500 1800
.948
. 91 l
l 700 1800
.951
.926 700 900
.933
. 87 700 3200
.933
. 89 Lowest efficiency =.933 If we use this, pf wou}g3ge # =.919
-]ighest pf in above table =.926, but his is at 1800 rpm.
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BUSES VOLTAGE CALCULATIONS 04-5011-113
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Suggest use.9 pf for reactor coolant pump motor.
Running Load = 4 x 7020 KVA = 28.08 MVA at 6.6KV.
Impedance at rated volts on 100 MVA base = 2
= 3.56125 pu.
08 Preliminary calculations showed that volta at motor terminals was approximately 1.033 pu of base voltage, 6.9 KV Impedance at 6.9 KV = 3.56125 x 1.0332 = 3.8007cj25.84
= 3.42021 + j 1.65634
-80 V LOADS l
Loads directly connected to the 480 V Switchgear Buses are taken from " Adequacy of l
Station Electric Distribution Voltages" - Calculations 10/21/80 pp. 5 thru 7.
Pf taken from motor data sheets. Motor KVA Loads are based on 460 volts. See " Crystal River 3 - Auxiliary Loading,"
Loads on Motor Control Centers are taken from " Adequacy of Station Electric Distribution Voltage" - Calculations 11/20/79. For the ES Buses the case is Load at End of Block Loading Sequence Including Manually Applied Loads. The loads have been calculated on 480 volts so the motor loads must first be expressed in terms of the l
460 volt rating - See " Crystal River 3 - Auxiliary Loading". From examination of l
motor data sheets it was apparent that an average pf of 0.85 would be a suitable value.
Non motor loads were expressed at 480 volts, so as the se are constant impedance loads there is no need to convert to a rated 460 volts.
1 In order to simulate cable impedances to loads, the load impedances were increased by 2%.
Motor Terminal voltages on the Unit Buses were estimated to be 94% of base voltage and 93% of base voltage on ES Buses. These figures were obtained from preliminary l
calculations.
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480 V LOADS CONNECTED DIRECTLY TO SWITCHCEAR BUSES KVA 460. V Running KVA 480 V Connected Running pf KW KVAR Condr. Vac. Pump 1A 137 137
. 92 126 54 Station Service Air 91 50
.905 45 21 Compressor 3A React Bldg. Ind. Cooler 73 50
.835 42 28 Pump 3A Cond. Injection Pump 3A 134 50
.915 46 20 259 123 Resistive 315 480V React Aux Bus 3A Inst. Air Compressor 3A 50
.905 45 21 Resistive 345 480V Intake Bus 5A Screen Wash Pump 70
. 85 60 37 480V Heating Bus 3 Heaters 827 480V Turbine Bus 3B Motors - As Bus 3A 259 123 Heaters 195 l
480V Reactor Aux. Bus 3B Motors - As Bus 3A 50
.905 45 21 Heaters 3
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BUSES VOLTAGE CALCULATIONS 04-5011-113
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MICROFILMED PAGES CALCULATION on,a,,,yo q g g
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oars 7/8/82 KVA 460. V Running KVA 480 V Connected Running pf KW KVAR 480V Intake Bus 3B Screen Wash Pump 3B 70
. 85 60 37 Screen Wash Pump 3C 70
. 85 60 37 120 74.
480V ES Bus 3A Decay Heat CCC Pump 3A 96
. 86 83 49 Cont. Comp. Wat.
213 9 192 93 -
Chiller 3A 275 142 480V ES Bus 3B As Bus 3A 275 142 l
480V Plant Aux. Bus 3 Resistive 733 1
m
r.
l LJ F 9 4.16KV UNIT BUS 3A 480V LOAD IMPEDANCES Q
{A EF! F Converted to
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KVA KW KVAR Motor 480V Base
-l 8
g g-480V 460V Volts KW KVAR MVA Z
G 1.02Z R+jx
,e Y
P Hnnting Transformer o
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Rssistive 827
.827 120.92 0
123.34 123.34+j0 h 5 Y--
=
3 to n M: china Shop MCC E
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m m
Mstors 102.3 83.4 51.75.94 94.39 58.57 5
"m O
<: z Hectors 177 177 58.57 R E co az 271.39 58.57.27764 360.18 12.18 367.38 359.11+j77.5
$N Turbini Aux xfr. 3A
- N ne Turbine Bus 3A
{ {
Motcrs 259 123
.94 2i 3 139 CE ac Hectors 315 315 5 jl; z6 608 139
.62369 160.34 12.88 163.54 159.43+j36.45 b
Turbins MCC 3A Motors 288 235 146
.94 266 165 g
Heaters 219 219 485 165
.5123 195.2 18.79 199.1 188.49+j64.13 b $'
U Water Treat MCC 3A Motors 205.4 167 104
.94 189 118 i
i Heaters 50 50 f
. o 239 118.26654 375.17 26.28 382.68 343.13+jl69.43
$ie I
b
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4.16KV UNIT BUS 3A 480V 1.0AD IMPEDnNCES (Cont'd)
Q g
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Converted to E
E A
KVA KW KVAR Motor 480V Base 5'
480V 460V Volts KW KVAR MVA Z
G 1.022 R+ _i x h
Vent MCC 3A o
o D
3 3
m C
Motors 284 231 143
.94 261 162 3
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2 m n H:sters 125 12.5 g g n
e m
273.5 162
.31788 314.59 30.64 320.88 276.08+jl63.53 o
m 4 [* 25 y
m s d gr Ei s Rarctor Aux. xfr 3A Rsctor Bus 3A p
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Motors 45 21
.94 51 24 gg Hectcrs 345 345 gg a c~.
396 24
.396/3 252.06 3.47 257.1 256.63+jl5.56 gg
$vm Rs:cter MCC 3Al b
Motors 52.2 43 26
.94 49 29 ee Hrcters 124.3 124.3 a
s~
173.3 29.17571 569.12 9.5 500.5 493.64+j82.61 Precs. Heater MCC 3A 726 726
.726 137.74 0
140.5 140.5+j0 w
O O
E O
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4.16KV UNIT BUS 3A 480V LOAD IMPEDANCES (Cont'd)
E n>
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D Converted to e
e KVA KW KVAR Motor 480V Base 480V 460V Volts KW KVAR MVA Z
G 1.02Z R+jx
{
S R ctor MCC 3A2
?
3 E
.A E
Motors 92.6 75 47
.94 85 53
- l 5
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=
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Heaters 114.4 114.4 3
EO O
E C/3 i
c h.E <Ci 199.4 53
.20632 484.68 J'.88 494.37 477.79+jl26.95 O
=
e se Inteke xfr. 3A h
am Intcka Bus 3A Mg Motors 60 37..
94 68 42.07992 1251.17 31.7 1276.2 1085.81+j670.61 mm b OD Hacters gm Intske MCC 3A d
Motors 54.2 44 28
.94 50 32 5m He:ters 60 60
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110 32
.11456 872.9 16.22 890.36 854.92+j248.7 e
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'! O 4.16KV UNIT BUS 3B 480V LOAD IMPEDANCES n
N 8,
n :
I C
D Converted to
{
8
-4 KVA KW KVAR Motor 480V Base 5<
480V 460V Volts _ KW KVAR MVA Z
1.02Z R+jx 3
Turbine Aux xfr. 3B P
E 3
m C
Turbine Bus 3B g
g f._
y M: tors 259 123
.94 293 139 0
5 EO E
A E
Resistive 195 195 o
m, y
488 139
.50741 197.08 15.9 201.02 193.33+j55.07
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Turbine MCC 3B h
Motors 206.9 169 104..
94 191 118 m
Resistive 132 132 PE
- 8 323 118
.34388 290.8 20.07 296.62 278.61+jl01.79
{Mm WI MCC 3B
{
Motors 150.5 123 76
.94 139 86 9*
Resistive 96 96 O
235 86
.25024 399.61 20.1 407.61 382.78+jl40.08 i
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0 4.16KV UNIT BUS 33 480V LOAD IMPEDANCES (Cont'd)
Q g
G, a
c Converted to
[
4 3 KVA KW KVAR Motor 480V Base 55 g-480V 460V Volts KW KVAR MVA Z
6 1.02Z R+ _i x I,.
R Mnt MCC 3B o
o e
a p
Motors 299 243 151
.94 275 171 N l 8 5.
j 3
as n Racistive 21 21 g
g*
296 171
.34184 292.53 30.02 298.39 258.36+jl49.29 E
E y
su A C Ei s Rrretar Aux. xfr 3B N
gy Rtcetor Bus 3B en :n
}
ny Motors 45 21
.94 51 24
{
Racistive 20 20 gg 71 24
.07495 1334.28 18.68 1360.97 1289.28+j435.89 d9 8@
mm Racetor MCC 3B1
{
Motors 42.3 35 21
.94 40 24 0
Resistive 57 57 o
97 24
.09992 1000.75 13.9 1020.77 990.88+j245.22 7
v.
7 w
0 0
y 9
LJ O
4.16KV UNIT BUS 3B 480V LOAD IMPEDANCES (Cont'd)
Q Gi n A c
Converted to E
-4 KVA KW KVAR Motor 480V Base 5'
Z 480V 460V Volts KW KVAR MVA Z
_1.02Z R+jx Ratetor MCC 3B2 o
o e
a p
Mstors 83.5 68 42
.94 77 48 N l !!_
3
=n Racistive 147 147 g
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224 48
.22909 436.52 12.09 445.25 435.37+j93.26 "m
- ? [
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s t sG Press Heater 3B 847 847 847 118.06 0
120.43 120.63+j0
@!; y 9
l Intake xfr 3B
{ $
Intake Bus 3B Mstors 120 74
.94 136 84
.15985 625.59 317 638.1 542.9+j335.3
- g 5
m WTMCC 3C b
i Motors 134 109 68
.94 123 77
.14511 689.11 32.05 702.9 595.77+j373 y
0 5
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4.16KV UNIT BUS 3A 480V LOAD IMPEDANCES g
g t, [
Converted to KVA KW KVAR Motor 480V Base 5
h Z
480V 460V Volts KW KVAR MVA Z
1.02Z R+jx 3
E ES Aux xfr 3A 2
3 m
C ES Bus 3A N
5 g $_
j 5
EO Motors 275 142
.93 318 164
.3578 279.49 27.28 285.08 253.37+jl30.66 E
0 g
@ma
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dM Motors 97.1 80 49
.93 92 57 8
om Resistive 213 213
- g 305 57
.31028 322.29 10.59 328.73 323.13+j60.41
@m O%
s:a ES MCC 3A2 dC Motors 240.1 196 122
.93 227 141
$m Resistive 88 88
{
315 141
.34512 289.76 24.11 295.55 269.77+jl20.73 g
6 o
m Motors 119.4 98 60
.93 113 69 k 8
[
Resistive 39 39 4
U l
152 69
.16693 599.06 24.42 611.04 556.38+j252.62 E
2 a
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-4.16KV UNIT BUS 3B 480V LOAD IMPEDANCES n'
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c Converted to
{,
KVA KW KVAR Motor 480V Base Z
480V 460V Volts KW KVAR MVA Z
G 1.02Z R+jx h
ES Aux xfr 3B p
3 K
M C
Moters 275 142
.93 318 163
.3578 279.49 27.28 285.08 253.37+jl30.66 4
3 gi g
5
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E4 E
% b E <m:E Motors 260.9 213 132
.93 246 153 Q-oo Reoistive 96 96 O F f*
342 153
.37466 266.91 24.1 272.25 248.52+jl11.16 g
Motors 70.95 58 35
.93 67 40 Resistive 236 236 5m 303 40.30563 327.19 7.52 333.74 330.87+j43.68
{
.93 113 69 6
3 39 39 w
152 69
.16693 599.06 24.42 611.04 556.38+j252.62 b y b
Plant Aux xfr 3 733
.733 136.43 0
139.15 139.15+j0 IOTE: As ES MCC 3AB can be supplied from either ES Bus 3A or ES Bus 3B, for the purpose of the calculation 3
M M
it was assumed to be supplied from ES Bus 3A.
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ENGINEERED SAFEGUARDS
"*"'y7 Gilbert Associates, lac.
BUSES VOLTAGE CALCULATIONS 04-5011-113
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Although cable impedances from 480 volt switchgear to Motor Control Centers are of little significance, they were taken into account by using actual lengths;the resistance and reactance for 1000 yards were taken from typical 600 V cable information.
~
REACTORS The per unit values of reactance were taken from " Adequacy of Station Electric Distribution Voltages - Crystal River 3" - Calculations dated 11/20/79.
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480V SYSTEM CABLE IMPEDANCES F Q s}:.
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Size Cables /
R/
X/ Length R
X R
Xpu Xpu
$g g
From To MCM Phase 1000 1000 Feet Q
Q g
Xpu Reactor Total 5
g.
E H oting Aux Machine Shops MCC 500 2
.0294.0257 190
.0028
.00244 1.215 1.059 1.059
[
xfr. 3
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5 E
Turb. Aux Turbine MCC 3A 500 2
.0294.0257 225
.00331.00289 1.437 1.254 1.997 3.251 4
E g f_
.0294.0257 437
.00643.00561 2.791 2.435 1.997 4.432 3
g3 Vent MCC 3A 350 2
.0406.0264 312
.00633.00412 2.747 1.788 1.997 3.785 o
a g
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.0294,0257 538
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. 021. 025 313
.00219.00261.9505 1.1328 2.1701 3.3029 g yg Reactor MCC 3A2 350 2
.0406.0264 309
.00627.00408 2.721 1.771 1.997 3.768 N
g; p m :o Intcks Aux Intake MCC 3A 350 1
.0406.0264 60
.00122.00158
.53
.686
.686 n@
ky xfr 3A i
l, pm gl Turbine Aux Turbine MCC 3B 500 2
.0294.0257 356
.00524.00457 2.274 1.984 1.997 3.981 xfr 3B Wr MCC 3B 500 2
.0294.0257 416.00612.00535 2.656 2.322 1.997 4.319 g ij; Vent MCC 3B 500 2
.0294.0257 318
.00468.00409 2.118 1.755 1.997 3.752 gb Rzteter Aux Reactor MCC 3B1 500 2
.0294.0257 530
.00779.00681 3.381 2.956 2.956
{
xfr 3B Press. Htr. MCC 3B 750 3
. 021.025 326
.00228.00272.9896 1.181 2.1701 3.3511 Reactor MCC 3B2 500 2
.0294.0257 347
.0051
.00446 2.214 1.936 1.936 N_
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.0294.0257 630
.00926.0081 4.019 3.516 3.516 xfr 3B u
.0406.0264 120
.00244.00158 1.059
.686
.686 1
.0406.0264 157
.00319.00207 1.385
.898
.0294.0257 265
.00779.00681 3.381 2.956 2.956 ES Aux ES MCC 3B1 500 2
.0294.0257 198
.00291.00254 1.263 1.102 1.102 xfr 3B ES MCC 3B2 500 2
.0294.0257 226
.00332.0029 1.441 1.259 1.259 ES MCC 3AB 500 1
.0294.0257 295.00867.00758 3.763 3.29 3.29 o y '"
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5' ENGINEERED SAFEGUARDS NE BUSES VOLTAGE CALCULATIONS 04-5011-113 19 Gilbert Associates,Inc.
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d a-0 MICROFILMED PAGE CALCULATION o,,,,,,,o, g g DATE 7/8/82 TRANSFORMER IMPEDANCES The Start Up Transformer equivalent circuit impedance was de nloped from test data supplied by telephone 6/15/82 from Florida Power Corporation.
The 4160/480 volt transformer impedances were obtained from Test Reports in Correspondence File EE (letter dated 7/8/1971.) As it was not known which serial number applied to individual transformers an average value was *aken for each KVA rating. Individual values were so close that any variation would be insignificant.
The tap setting for the Start Up Transformer was 224 250 volts which was the setting when voltage measurements were taken.
As FPC did not know the taps on which the 4160/480 volt transformer were set, calculations were perfonned with those transformers on nominal taps.
(Telephone conversation with FPC 6/17/82).
START-UP TRANSFORMER IMPEDANCES Resistance Load Loss H-X = 31.9 KW at 18 MVA Load Loss H-Y = 62.5 KW at 15 MVA l
Load Loss X-Y = 77.65 KW at 15 MVA l
Rpu H-X = 31 9
.001772 at 18 MVA =.009844 at 100 MVA
=
18000 H-Y = 62.5 =.004167 at 15 MVA =.02778 at 100 MVA 15000 l
l X-Y. 77.65
.005177 at 15 MVA =.034513 at 100 MVA
=
l 15000 l
l
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BUSES VOLTAGE CALCULATIONS 04-5011-113
"
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d 40 MICROFILMEO PAGES CALCULATION o,,,,,,7o q, g oATE 7/8/82 HO = HX+HY-XY,.009844+.02778.034513 =.001556 pu 2
2 OX = HX+ H -HY,.009844+.034513.02778 =.008289 pu 2
2
-HX,.034513+.02778.009844 =.026225 pu
+
OY =
Zpu H-X =.0585 pu at 18 MVA =.325 pu at 100 MVA H-Y =.086 pu at 15 MVA =.57333 pu at 100 MVA X-Y =.1158 pu at 15 MVA =.772 pu at 100 MVA HO =.325+.57333.772 =.063165 2
OX =.325+.772.57333 =.261835 2
OY =.772+.57333.325 =.510165 2
2 1/2 Zpu2 - R pu Xpu
=
H0 =
.0631652
.0015562 1/2 =.063146 l
OX =
.2618352
.0082892 1/2 =.261704 1/2 =.509491 OY =
.5101652
.0262252 1
l l
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ENGINEERED SAFEGUARDS
'21 Gilbert Associates. Inc.
BUSES VOLTAGE CALCULATIONS 04-5011-113 o,
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40 MICROFILMED PAGES CALCULATION o,,om,,ogg (p,(
oatE 7/8/82 4160/480 VOLT TRANSFORMER IMPEDANCES LOAD PER UNIT KVA LOSS KW R%
Z%
X%
DARE SERIAL NO.
IMPEDANCE ON 500 3.816
.7632 4.85 4.7896 1.29.71 48-20329-C1 100 MVA. BASE 500 3.831
.7662 4.99 4.9315 1.29.71 48-20329-D1 R
X Average
.7647 4.8606 1.5294 9.7212 1000 11.973 1.1973 5.35 5.2143 1.26.71 20329-B1 11.871 1.1871 5.32 5.1859 20329-B2 11.858 1.1858 5.28 5.1451 20329-B3 Average 11.9007 1.1907 5.1818 1.1907 5.1818 1500 13.887
.9258 5.36 5.2794 2.10.71 20329-A3
.6172 3.5196 2000 18.705
.9533 5.97 5.8934 5.14.71 48-20329-E01 18.775
.93875 5.96 5.8856 5.14.71 48-20329-E02 19.034
.9517 5.95 5.8734 5.15.71 48-20329-E03 18.39
.9195 5.63 5.5544 5.15.71 48-20329-E04 Average
.9408 5.8017
.4704 2.90085 l
l l
l l
l
J su:JEcr ENGINEERED SAFEGUARDS C'5'D PAGE 22 A E NNTIMS O H 011-113 Gilbert Associates,Inc.
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I 4
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.53+j.686 854.92+j248.7 Intake MCC 3A 1.5294+j9.7212 m-
_e 1085.81+j670.61 Intake Bus 3A Y
_m.
.5 2.721+j3.768 477.79+jl26.95 Reactor MCC 3A2 ycc.
- _w -
(
.9505+j3.3029 140.5+jo Press. Heater MCC 3A w
.4704+j2.9009"t m:
3.4333+j2.999 493.64+j82.61 Reactor MCC 3Al w
256.63+jl556 4
or
.. m I
J 2.747+j3.785 276.08+jl63.53 Vent MCC 3A h
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i
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.4704+j2.90094 1.437+j3.251 188.49+j64.13 Turbine MCC 3A N
w j
159.43+j36.45 w_,
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.6172+j3.5196
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BUSES VOLTAGE CALCULATIONS 04-5011-113
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1085.81+j670.61
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7/8/82 DATE 10.669+j6.0902
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490.26+j203.11 g
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vvvv 599.86+j376.516 l
-e l
1.5294+j9.7212 1.5294+j 9. 7212 284.985+jl77.366 l
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^% w-542.9+j335.3 hv W
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l 32.691+jl6.264 m
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q 1.441+jl.259 330.87+j43.68 ES MCC 3B2 1.1907+j5.1818 Ri
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1.263+jl.102 248.52+jl11.16 ES MCC 3B1 D
h w
253.37+jl30.66 ES BUS 3B g
l 32.691+jl6.264 N
l 3.381+j2.956 556.38+j252.62 ES MCC 3AB
-w w ht g
1.385+j.898 269.77+jl20.73 ES MCC 3A2 m
me w-g 1.1907+j5.1818 1.059+j.686 323.13+j60.41 ES MCC 3Al j
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l 1.1907.j5.1818 139.15+j0 140.841+j5.1618 m-n I
32.691+jl6.264 32.691+jl6.24 v
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332.311+j44.939 a
1.1907+j5.1618 h
1.1907+j5.1618 93.375+j34.797 x
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1.1907+j$.1618 11907+j5.1618 81.176+j32.19 e
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4.09+j3.516 595.77+j373 Water Treating MCC 3C 1.5294+j9.72.2 & ^
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542.9+j335.3 Intake Bus 33 w
2.214+jl.936 435.37+j93.26 Reactor MCC 3B2 w.
w:
.9896+j3.3511 120.63+j0 Press. Heater 3B
~^
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.4704+j2.90085'
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S 3.381+j2.956 990.88+j245.22 Reactor MCC 3B1 m-m.
T 1289.28+j435.89 O
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2.118+j3.3752 258.36+jl49.29 Vent MC 3B m,
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2.656+j4.319 382.78+jl40.08 Water Treating MCC 3B
.4704+j2.90085,
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40 MICROFILMEO PAGES CALCULATION o,,,,,37o,4 DATE 7/8/82 voltage At 4.16 kv Buses and 6.9 kv Buses H
,.001556+j.063165 0
{
.008289+j.261835
.026225+j.509491 N
tX
- Y 3.42021+jl.65634 2.902+jl405 I
6.9 Motor Load 4.16kv Winding Load l
.001556+j.063165
.001556+j.063165 = 31 i
!o o
c l
$1.58189+j.96242 = T2 3.4285+jl.9182 2.9282+jl.9145
/,,
f Volts at 0 =
32
=.9815 of Volts at H 41+?2 Measured voltage at H = 244.8 kv Tap = 224.25 kv Equivalent No load volts at H = 244.8/224.25 = 1.091639 p.u.
i
ENGINEERED SAY IRDS suuccr clsio paos 33 BUSES VOLTAGE CALCULATIONS 04-5011-113 Gilbert Associates,Inc.
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CALCULATION on,,,,,,ongg g oave 7/8/82 Voltage at 0 =.9815 x 1.091639 = 1.07144 p.u.
Voltage at Y =
x 1.07144 p.u.
026225+j.
L +2 02+jl.405 92159 x 1.07144 =.98743 p.m. =.98743 x 4.16 = 4.108 kv
=
This is voltage at 4.16 kv bus.
We used.99% base voltage at 4 kv motor terminals to determine the motor inpedance, which is very close to.98743 so that no readjustment of motor impedance is necessary Voltage at X e x 1.07144 p.u.
008289+3 6 5
2 jl.65634 967305x1.07144 = 1.0364 p.u. which is sufficiently close to the
=
value of 1.033 p.u. assumed for motor voltage so that no readjustment of motor inpedance is necessary.
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"^*E B M ES V0M AGE N N TIONS 04-5011-113 34 Gi!bert Associates,Inc.
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3 480V Transformer 1.1907+j5.1618 ES480VBus3A I
480V Load 81.176+j32.19 i
Voltage at 480V Bus =
81.176+j32.19 x.98743 p.u.
1.1907+j 5.1618+81.176+j 32.19
=.96556x.98743 =.95342 p.u.
=.95342480 = 457.6 VOLTAGE AT ES 480V BUS 3B From page 30 l-ES4.16kv Bus 3B Volts =.98743 p.u.
I 1.1907+j5.1618 ES480V Bus 3B 93.375+j34.797 Voltage at 480V Bus =
93.375+j34.797 x.98743 1.1907+j5.1618+93.375+j34.797
=.97065 x.98743
.95845 p.u.
=,95845 x 480 = 460V A
Ie surJEcr ENGINEERED SAFEGUARDS C*
"^GE Gilbert Associates. Inc.
BUSES VOLTAGE CALCULATIONS 04-5011-113 31
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y
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23.41+jll.347 ES Bus 3A H
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Y 8.274+j4.122 Unit Bus 3B i
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7.448+j 3. 749 Unit Bus 3A
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_d 40 MICROFILMED PAGES CALCULATION on,omayo g g g oATE 7/8/82 VOLTAGE AT ESMCC3AB from page 29 ES480VBus3A Volts.95342 p.u.
$ 3.381+j2.956 l
ESMCC3AB
<' 556.38+j282.62 Voltage at ESMCC3AB =
556.38+j252.62 x.95342 3.381+j 2. 956+j 556. 38+j 252. 62
=.99301 x.95342 =.94676 p.u.
=.94676 x 480 = 454.4 volts i
1.
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ENGINEERED SAFEGUARDS CBSID PAGE 35 Gilbert Associates,Inc.
BUSES VOLTAGE CALCULATIONS 04-5011-113 R E V.l l 0]
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40 MICROFILMED PAGES CALCULATION o,o,,,yo,4p g catE 7/8/82 VOLTAGE AT ESMCC3Al From page 29 ES480VBus3A volts.95342 p.u.
k'1.059+j.686 J
FSMCC'4 A1 323.13+j60.41 Voltage at MCC 3Al =
323.13+j60.41 x,95342 1.059+j.686+323.13+j60.41
=.99646x.95342 =.95004 p.u.
=.95004x480 = 456 volts VOLTAGE AT ES MCC 3A2 From page 29 ES480V Bus 3A Volts.95342 p.u.
I 1.385+j.898 s
ESMCC3A2 l
269.77+jl20.73 Voltage at MCC 3A2 =
269.77+jl20.73 x.95342 p.u.
1.385+j.898+269.77+jl20.73
=.99451 x.95342 =.94819 p.u.
=.94819 x 480 = 455.1 volts j
a
"" E CT
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PAGE Gilbert Associates,Inc.
BUSES VOLTAGE CALCULATIONS 04-5011-113 37
"'N N
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7/d/82 onTE VOLTAGE AT ESMCC 3B1 From page 29 ES480VBus3B Volts.95845 p.u.
1.263+jl.102 ESMCC3B1 1
248.52+jl11.16 Voltage at MCC 3B1 =
248.52+i111.16 x.95845 p.u.
1.263+jl.102+248.52+jl11.16
.99415 x.95845 =.9528 p.u.
=
.9528 x 480 = 457.3 volts
=
VOLTAGE AT ES MCC 3B2 From page 29 ES480VBun3B Volts.95845 p.u.
l 1.441+jl.259 ESMCC3B2 330.87+j43.68 Vol
- MCC 3B2 =
330.87+j43.68 x.95845 p.u.
1.441+jl.259+330.87+j43.68
=.99524 x.95845 =.95389 p.u.
.95389 x 480 = 457.9 volts
=
d
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MICROFILMED PAGES CAL"38LATlON o,,om,yo,,4 u
7/8'/82 oATE Impedance of Load on Y vinding of Start Up Transformers = 2.902+jl.405 = 3.224 pu which corresponds to a load of
= 31.015 MVA at.9 pf.
FOA 65C rating of Y winding = 28 MVA.
Impedance of load on ES Aux Transformers 3A = 81.176+j32.19 = 87.325 pu. which corresponds to a load of
^
87 5
OA rating of transformers = 1 MVA Impedance of load on ES Aux Transformer 3B = 93.375+j34.797= 99.648 pu which I
.004 M A corresponds to a load of
=
99 48 OA rating of Transformer. = 1 MVA No load volts of Start Up Transformer Y winding = 2 5
Measured volts on ES 4.16 KV Bus 3A = 4183 volts Drop through Y winding = 4541-4183 = 358 volts Calculated volts on ES 4.16 KV Bus 3A = 4108 Calculated drop through Y winding = 4541-4108 = 433 3
i.e. calculated drop is (
- 1) x 100 = 20.95% greacer than measured volt drop.
3 Measured no load volts on ES Aux Transformer 3A
= 4179 x
= 482 assuming on nominal tap.
0 I
4
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MICROFILMEO PAGES CALCULATION
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DATE 7/8/82 Measured Values i
Calculated Plant At Full Load Bus Value Steady State Condition 230kv Grid 244.8kv 244.8kv 4160V Switchgear ES Bus 3A 4108V 4183v i ES Bus 3B 4108V 4179V 480V Switchgear ES Bus 3A 458V 472v ES Bus 3B 460V 475v MCC480V ES 3Al 456V 469V ES 3A2 455V 468v ES 3AB 454V 468V ES 3B1 457V 472V ES 382 458V 471V The calculations were made on the basis of the 4160/480 volt transformers being on the nominal tap.
If, however the tap was such as to give a 2-1/2% voltage boost then the 480V switchgear and MCC voltages would be increased by approximately 2-1/2%.
If the voltage on the high voltage side of the startup transformer were 240- 11p=
236.4kv, the calculated voltages would be obtained as a very close approximation by ruitiplying the calculated voltages in the above table by.965686.
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ENGINEERED SAFEGUARDS
"^G' Gilbert Associates.Inc.
BUSES VOLTAGE CALCULATIONS 04-5011-113 40
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m 4o MICROFILMED PAGES CALCULATION o,,,,,,,o,4 g oATE 7/8/82 Measured volts on ES 480 V Bus 3A = 472 Measured Volt drop through ES Aux Transformer 3A =.482-472 = 10 Calculated no load volts on ES Aux. Transformer 3A
=4108xf8 g = 474 Calculated voltage on 480 V swgr. bus = 458 Calculated volt drop through ES Aux. Transformer 3A = 474-458 = 16 The discrepancy between calculated and measured voltages is most probably due to loads as measured being appreciably lower than loads used in the calculation.
The calculated load on the 4.16 KV winding of the Start Up Transformer was approximately 31 MVA; the FOA 65 C rating of this winding is 28 MVA.
It is improbable that the measurements would be made with a load as great as 28 MVA.
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The calculated load on ES Auxiliary Transformer 3A was approximately 1.15 MVA, the OA rating of the transformer being 1 MVA.
Calculated loads in many cases were taken as rated loads of equipment also the l
condition used in the calculations was that of Maximum Plant Loading including
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Maximum Engineered Safeguard Loads.
l Previous calculations were' approximate and are superseded by the present calculations from which the comparative voltage table is compiled, so that i.elay settinga should be based on the above table.
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