The DC high voltage generator is a relatively common DC withstand voltage device in the power preventive test equipment. The earliest DC high voltage generator can be used for the DC withstand voltage test of electric power to check the insulation performance of the cable. However, with the power preventive test The research found that the insulation performance in the DC state is not perfect. Compared with the AC withstand voltage equipment such as the series resonance test device, the DC high-voltage generator has more hidden damage to the cable. The scope of application is limited to a certain extent. At this stage, the DC high voltage generator is mainly used for the leakage of zinc oxide arresters or as a DC power supply. Next, we will talk about the test methods and precautions of the DC high voltage generator for measuring oxidizing arresters.

Wiring method for DC high voltage generator

Before using the DC high voltage generator, connect the connecting wire and the ground wire as shown in the figure below, and ensure that the grounding is reliable. If the zinc oxide arrester is removed for measurement, the zinc oxide arrester should be placed on the insulator, and a sufficient safety distance should be maintained .

Wiring method for DC high voltage generator

The DC withstand voltage test should be carried out in dry weather as much as possible, and then wipe the test product clean and keep a sufficient safe distance from the surroundings. Before the test, it is best to discharge the test product to the ground.

Start the DC withstand voltage meter, turn the pressure limiting knob on the control panel to the right to the maximum, and then increase at a constant rate of 2% of the test voltage per second. Pay attention to the reading of the microammeter during the boost process. According to the zinc oxide arrester According to the test specification, the leakage current value should be read at 1mA, and the leakage current at 0.75 times the voltage is the leakage current. Therefore, try to rise slowly during the boost process. When boosting, you can use the fine adjustment knob to cooperate, try not to Exceeding the regulations is too much. The leakage current varies according to the voltage level. The smaller the leakage current, the better, usually 0 to 5mA. After the test is completed, remember to fully discharge, otherwise the residual voltage may harm your safety.