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.

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