When using series resonance in the field withstand voltage test, why sometimes the resonance point cannot be found? We summarized based on his own 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, there is an error in the wiring of the test device;
3, the device is not reliably grounded before the test;
4, the high-voltage sampling feedback signal is open or unreliable;
5. The sample is faulty.
What can be eliminated
1. Check carefully before real-time to see if the equipment is grounded and if there is a breakpoint on the grounding wire;
2, check the on-off of the high and low voltage coils of the excitation transformer;
3. Check whether the reactor wiring is wrong.
4, check the continuity of the voltage divider signal line;
5, check the continuity of the high and low voltage capacitor arm of the voltage divider;
6. There is no resonance point when the device is boosted, and the on-off of the compensation capacitor must be checked.