The application of high-frequency DC high-voltage generators is very extensive, in which the power cable DC withstand voltage and leakage tests are frequently performed by the power sector. How does the high frequency DC high voltage generator perform leakage and DC voltage withstand test operation? 1. Before doing the load test, install the high-voltage shielded microampere meter on the high-voltage output terminal of the high-pressure double-pressure cylinder, and connect the dedicated shielded cables to the microampere meter and the tested product respectively (see details High voltage shielding microammeter operating instructions). 2. Check whether the instrument, discharge rod, double pressure cylinder, test product connection line and grounding line are correct, and whether the grounding line connection is reliable. Check whether the high-pressure safety distance meets the requirements before starting the high-pressure test of the sample. 3. After confirming that there is no abnormality in the instrument, etc., 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 voltage withstand test of the test sample can be started. 4, press the red button, then the red light, that high pressure connected, to be increased pressure. 5ã€Adjust the coarse adjustment and fine adjustment of the piezoelectric position smoothly in the clockwise direction, and the output end starts to increase from zero. The step-up rate is preferably 3-5 kV per second to increase the test voltage. For large capacitor samples, the boost voltage must be increased slowly. Otherwise, voltage overshoot may occur. It is also necessary to monitor that the charging current of the ammeter does not exceed the large charging current of the DC generator. When the desired voltage or current is reached, the ammeter and voltmeter readings are recorded for the specified time. 6. After the test is completed, step down and adjust the coarse and fine adjustment of the piezoelectric device 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 wand to perform multiple discharges on the test sample. Discharge may be performed near the test sample and disconnection (discharge please refer to the discharge wand manual for details). For small capacitor samples such as zinc oxide surge arresters, magnetic discharge arresters, etc., first increase to 90% of the required voltage (current) with a coarse adjustment, and then gradually increase the voltage to the desired voltage (current) value with a fine adjustment potentiometer. Then read the voltage (current) value from the digital meter. If you want to measure the 75% VDC-1mA of the zinc oxide surge arrester, you should first rise to the current value to 1mA and stop the voltage value (in this case, record the voltage and current value). Then press the yellow button, the voltage will drop to the original value. 75% and keep this state. At this point, the microampere meter values ​​and voltage values ​​can be read. After the measurement is completed, adjust the piezo-electric counter to return to zero counterclockwise, press the green button, and press the red button when you need to raise the pressure again. For large-capacity samples, the boost should be even slower, and it is necessary to monitor that the charging current of the ammeter does not exceed the large charging current of the generator, and the boosting speed must be slowed to avoid excessive charging current. After the test is completed, turn the voltage adjustment potentiometer counterclockwise back to zero, then press the green button to cut off the high voltage. At this point, note that the voltage on the voltmeter drops to about 15kV, and the discharge rod can be used for multiple discharges to ensure safety.
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The high-frequency DC high-voltage generator for leakage and DC voltage withstand test operation method is something that we must master before using this instrument, which can help us to better use it to carry out tests to ensure the accuracy of the test data.
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