By hvhipot 
HV Hipot Electric Co., Ltd. specializes in producing series resonance (also known as cable withstand voltage tester). Next, we will share with you what to pay attention to when testing cable withstand voltage testers?
Precautions for the operation process of power frequency withstand voltage test
a、 Test personnel should divide responsibilities, set a safe distance at the test site, carefully inspect the grounding of the test sample and test transformer, and assign a dedicated person to monitor safety and observe the status of the test sample.
b、 The main parts of the test sample should be cleaned thoroughly and kept absolutely dry to avoid damaging the test sample and causing errors in the test values.
c、 For the testing of large equipment, it is generally necessary to first conduct a no-load test of the test transformer, that is, to increase the voltage to the test voltage without connecting the test sample, in order to calibrate the accuracy of the instrument indication and adjust the ball spacing of the discharge ball gap.
d、 When conducting a voltage withstand test, the boosting speed should not be too fast, and sudden pressure should be prevented. For example, if the regulator is not at zero position, it should be suddenly closed, and the power should not be suddenly cut off. Generally, it should be closed when the regulator drops to zero position.
e、 During the boost or withstand voltage test, if any of the following abnormal situations are found:
(1) The pointer of the voltage and current meter swings greatly
(2) Abnormal noise emitted by the test sample
(3) If insulation is found to be burnt or smoking, the voltage should be immediately reduced, the power should be cut off, the test should be stopped, and the cause should be identified.