627-500 34
DIELECTRIC TESTING
Rating, kV
Withstand, kV
System
Applied Line-to-Ground
1
Nom.
Max
Nom.
Max
60-Hz, RMS
2
Dc
34
Impulse (BIL)
13.8
17.0
8.3
9.8
36
50
95
25
29
14.4
16.7
60
70
125
1
The output voltage of S&C Voltage Sensors, which may be furnished
with the switchgear, are normally 20 volt-amperes at 120 volts, 60 hertz
with a 720-ohm resistive burden connected across the output terminals
and with line-to-ground voltage corresponding to rated nominal system
voltage applied to the line terminal.
2
Ac tests made on this equipment after shipment by S&C should be
conducted at no more than 0.75 times the values shown. When making
ac tests, the time duration for application of the test voltage should be
limited to less than 10 seconds.
3
The column headed “Dc” is given as a reference only for those making
dc tests and represents values believed to be appropriate and approxi-
mately equivalent to the corresponding power-frequency withstand test
values specifi ed for components of this voltage class. The presence of
this column in no way implies any requirement for a dc withstand test on
these components.
4
Dc withstand tests made on this equipment after shipment by S&C
should be conducted at no more than 0.75 times the values shown. When
making dc tests, the test voltage should be raised in discrete steps—one
minute per step.
