By hvhipot 
Precautions for Partial Discharge Tester
1. The operation and maintenance of the partial discharge tester should be carried out by relevant professionals who are qualified for the test.
2. The test site voltage of the partial discharge tester is as high as tens of thousands of volts, and the test personnel should strictly abide by all safety precautions. There should be obvious and clear warning signs in the test area, and everyone on site should be aware of the high-voltage area. The measurement personnel who are directly engaged in the measurement should be aware of all live components and high-voltage components in the measurement loop, and those who are not directly involved in the measurement should be isolated outside the test area. During the test and after power-on, no one is allowed to enter the high-voltage area.
3. Before the test, the operator should master the test circuit, test method, test procedure and test purpose.
4. The test site should be tidy and clean, and other irrelevant items should not be stored. There should be no messy metal pieces (such as bare copper wire segments, screws, nuts, and other small metal pieces) on the ground in the high-voltage range. The tested product, step-up transformer, coupling capacitor, etc. should be kept at a proper distance from the surroundings.
5. The surface of the tested product, step-up transformer, coupling capacitor, etc. should be kept dry and clean, because moisture and dirt on the surface will cause partial discharge on the surface and cause abnormal measurement.
6. The test operator connects the lines according to the regulations. Various metal objects in the test area should be firmly grounded. Check and improve all possible discharge parts in the test area (if there are no sharp or acute angles). Pay special attention to whether the various ground wires are well grounded. .
7. Before the test starts to pressurize, the test personnel must check the circuit in detail and comprehensively to avoid wrong connection of the circuit. Particular attention should be paid to whether the wiring of the ground wire, high-voltage wire and strong current loop is firmly connected.
8. When the partial discharge tester is abnormal in the test, the power supply should be cut off before further processing.