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Steps of DC high voltage generator withstand voltage test

2021-06-21 16:46:00   Source:    Hits:

⑴ Before doing the load test, install the high-voltage shielded micro-ammeter on the high-voltage output terminal of the pressure doubler, and connect the matching special high-voltage wires to the micro-ammeter and the test product respectively.
⑵ Check whether the instrument, discharge rod, pressure doubler, test product connecting wire, and grounding wire are correct, whether the grounding wire connection is reliable, and check whether the high-voltage safety distance meets the requirements, before starting the high-voltage test of the test product.
⑶ After checking the instrument and confirming that there is no abnormal condition with 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. The DC leakage and DC withstand voltage test of the sample can be started.
⑷ Press the red button, the red light is on, indicating that the high voltage is connected and the voltage is to be increased.
⑸ Gently adjust the potentiometer in a 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 large-capacitance test products, the voltage needs to be boosted slowly, otherwise it may cause voltage overshoot. It is also necessary to monitor that the charging current of the ammeter does not exceed the charging current of the DC generator. When it rises to the required voltage or current, record the readings of the ammeter and voltmeter at the specified time.
⑹ After the test, reduce the voltage and reset the potentiometer to zero, then press the green button to cut off the high voltage and turn off the power switch.
⑺ 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 the discharge. Slowly adjust the voltage regulator to the required voltage (current) value for small capacitor samples such as zinc oxide arresters and magnetic blown arresters, and then read the voltage (current) value from the digital display. When the zinc oxide arrester needs to be measured at 75%VDC-1mA, the voltage value should be stopped when the current reaches 1000uA (the voltage and current values ​​can be recorded at this time), and then press the yellow button, the voltage will drop to the original value 75%, and keep this status. At this time, the microammeter value and voltage value can be read. After the measurement is completed, the potentiometer returns to the zero position counterclockwise, press the green button, and press the red button when the pressure needs to be increased again. 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, then press the green button to cut off the high voltage. Do not turn off the power at this time. The voltmeter shows that there is a voltage value, which is the stored voltage. Wait until the voltage drops to Around 2000V, the discharge rod can be used for multiple discharges to ensure safety.