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Detection Technology

Operation of DC withstand voltage and leakage test

time:2021/3/11   source:华天电力  reading:257 time

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


1. Before the load test of the DC high-voltage generator, install the high-voltage shielded micro-ammeter on the high-voltage output end of the high-voltage doubler, and connect the matching shielded wires to the micro-ammeter and the test product respectively.


2. Gently adjust the coarse and fine adjustment of the potentiometer in the clockwise direction, and the output terminal will start to boost from zero. The boost speed is appropriate to increase the test voltage by 3-5kV per second. For the large-capacitance test product, it is necessary to increase the voltage slowly, otherwise it 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.


3. After the test of the DC high voltage generator is completed, lower the voltage, and after the 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.


DC Hipot Tester.png


4. 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 high-voltage safety distance meets the requirements, and everything is normal before starting the test.


5. After checking that there is no abnormality in the DC high-voltage generator, 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.


6. Press the red button and the red light will be on, indicating that the high voltage is connected and the voltage is to be increased.


7. After the test is completed, use the discharge rod to discharge the test product many times, and then approach the test product and take off the wire after the discharge.


For large capacitor samples, the boost should be slower, and the charging current of the ammeter needs to be monitored not to exceed the maximum charging current of the generator. The boost speed must be slowed down to avoid excessive charging current. After the test is completed, return the voltage regulator potentiometer to the zero position counterclockwise, and then press the green button to cut off the high voltage. At this time, pay attention that the voltage on the voltmeter drops to about 15kV, and then the discharge rod can be used for multiple discharges to ensure safety.

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