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Steps of DC withstand voltage test

time:2020/9/20   source:华天电力  reading:236 time

The DC high voltage generator is mainly used for the DC withstand voltage and leakage test of zinc oxide arresters, cables, motors and other equipment. For the safety of people and equipment, the operator should follow the steps below:

(1) Before the load test, install the high-voltage shielded micro-ammeter on the high-voltage output terminal of the high-voltage doubler, and connect the matching special shielded wires to the micro-ammeter and the test product respectively.

 (2) Check whether the instrument, discharge rod, pressure doubler, test product connecting wire, and grounding wire are properly connected, whether the grounding wire connection is reliable, and whether the pressure safety distance meets the requirements, and everything is normal before starting the test.

DC Hipot Tester.png

(3) After checking and confirming that there is no abnormality in the instrument, turn on the single-phase AC 220V power switch. At this time, the green light is on, indicating that the power is on. Press the set button again to enter the test setting interface before starting the DC leakage and DC withstand voltage test of the sample.

 (4) Press the red button, the red light is on, indicating that the high voltage is connected and the voltage is to be increased.

 (5) Gently adjust the coarse and fine adjustment of the potentiometer in a clockwise direction, and the output will start to boost from zero. The boosting speed is 3-5kV. It is appropriate to increase the test voltage per second. For the large-capacitance test product, it is necessary to increase the voltage slowly. Scratching may cause voltage overshoot. It is also necessary to monitor that the charging current of the ammeter does not exceed the maximum charging current of the DC generator. When it reaches the required voltage or current, record the readings of the ammeter and voltmeter at the specified time.

(6) After the test is completed, reduce the voltage, and after coarse and fine adjustment of the potentiometer back to zero, then press the green button to cut off the high voltage and turn off the power switch.

(7) After the test is completed, use the discharge rod to discharge the test product several times, and then approach the test product and remove the wires after discharge.

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