High Voltage Withstand Test

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Ensure that all VT primary connections are fully isolated before performing any HV pressure testing on the equipment. When applying AC/DC test voltages greater than 12 kV, it is recommended to add supplementary insulation to the bushing to help prevent flashover or insulation failure. The bushing sleeve is designed to be used in conjunction with some additional insulation method, such as econ boot or heat shrink termination boots. Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Ensure that all VT primary connections are fully isolated before performing any HV pressure testing on the equipment.
When applying AC/DC test voltages greater than 12 kV, it is recommended to add supplementary insulation to the bushing to help prevent flashover or insulation failure.
The bushing sleeve is designed to be used in conjunction with some additional insulation method, such as econ boot or heat shrink termination boots.

Failure to follow these instructions will result in death or serious injury.

Connect the HV test set as shown in the Figure – Connections of Circuit Breaker/Switch and Figure – Schematic of Test Connection and carry out the withstand tests in accordance with the Table – Test Voltages and Table – Test Connection.

Rated Voltage (kV)	AC Test Voltage (kV)	Frequency (Hz)	Duration (minutes)	DC Test Voltage Current Practice (kV)
3.6	8	50	1 (AC) 15 (DC)	7.5
7.2	16	50	1 (AC) 15 (DC)	15
12	23	50	1 (AC) 15 (DC)	25

Test Number	Ring Switch 1	Ring Switch 2	Circuit Breaker	Live Terminals	Earthed Terminals
1	Closed	Closed	Closed	L1, L3	L2, Frame
2	Closed	Closed	Closed	L2	L1, L3, Frame
3	Closed	Closed	Open	L1, L2, L3	L1, L2, L3, Frame
4	Closed	Closed	Open	L1, L2, L3	L1, L2, L3, Frame
5	Open	Open	Closed	L1, L2, L3	L1, L2, L3, L1, L2, L3, Frame
6	Open	Open	Closed	L1, L2, L3, L1, L2, L3	L1, L2, L3, Frame