ML20151Y488

Submits Comparison of Field Measured Voltage Drops Against Calculated Values

ML20151Y488
Person / Time
Site:	Salem
Issue date:	06/21/1988
From:	Hajos L Public Service Enterprise Group
To:	Myers J Public Service Enterprise Group
Shared Package
ML18093B042	List: ML20151Y488
References
ELE-88-0195, ELE-88-195, NUDOCS 8808260414
Download: ML20151Y488 (2)

Text

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i PSMG ELE-88-0195

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Nuclear Department I

TO: J. R. Myers Electrical Supervisor FROM: L. G. Hajos C

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Senior Staff Engineer S UBJECT : EWR 121-88-0179 .

COMPARISON OF FIELD MEASURED VOLTAGE DROPS AGAINST CALCULATED VALUES DATE: June 21, 1988 Field testing was performed to measure the voltage drops across the cables feeding the Service Water Intake MCC.

Test results are as follows:

VOLTAGE CURRENT 1A 230V BUS SW INTAKE MCC 1A8Y-A

%A-%B 245V 243V dA 34.2 AMPS dB-$C 246V 243V fB 35.6 AMPS

'pC-@A 244V 243V pC 34.5 AMPS voltage drop calculation procedure:

Cable size 00 Impedance . 0.000081103 Ohms / feet Length 1030 ft.

Cable Impedance 0.00081103 X1030=0.08354 Ohms There are two ( 2) cables in parallel Z=0.08354/2=0.04177 Ohms Measured current 34.2 Amps 8808260414 880815 PDR ADOCK 05000272 y PNU nm, :>>,

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J. R. Myers 2 6/24/88 l

Voltage drop (phase to neutral) 0.04177 x 34.2=1.4285 Volts Voltage drop (phase to phase) 1.4285 XY3=2.474 Volts Voltage @ MCC (phase to phase) 243 Volts .

Voltage 0 1A Bus  !

l calculated (phase to phase) 245.4 Volts j Voltage @ 1A Bus ,

measured I (phase to phase) 245 Volts It can be seen that the calculated and measured values are very close, which proves that the methodology used in the calculations is correct. It needs to be mentions that the exact case used in the Ebasco calculations could not be tested due to load restrictions on the respective feeder. j i

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C V. J. Polizzi R. W. Skwarek vRf B. Swartzwelder R. W. Chronowski l

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