By hvhipot 
Why is it sometimes difficult to find the resonance point when using series resonance in on-site voltage withstand tests? We summarize based on his years of experience.
The main reasons are as follows:
1. The resonance point of the device exceeds the output frequency range of the host;
2. The wiring of the testing device is incorrect;
3. The equipment was not reliably grounded before the test;
4. High voltage sampling feedback signal open circuit or unreliable;
5. There is an issue with the sample.
What can be eliminated
1. Carefully check whether the equipment is grounded and whether the grounding wire has a break before real-time monitoring;
2. Check the on/off status of the high and low voltage coils of the excitation transformer;
3. Check if the wiring of the reactor is incorrect.
4. Check the conductivity of the voltage divider signal line;
5. Check the conductivity of the high and low voltage capacitor arms of the voltage divider;
6. When the device is boosted, there is no resonance point, and the continuity of the compensation capacitor must be checked.
HV Hipot Electric Co., Ltd. specializes in producing series resonant cables (also known as series resonant cable withstand voltage) and has been engaged in the electrical measurement industry for many years. Its products have first-class quality and welcome customers to come and purchase.