Common faults and solutions ofseries resonance (also known as AC withstand voltage test device):

1、 The host cannot find the resonance point.  

Reason: The resonance point of the system is outside the output frequency range of the host; System wiring error; The system is not reliably grounded; High voltage sampling feedback signal open circuit or unreliable connection; The test sample has a malfunction.  

Exclusion method:

1. Check the reliability of the grounding device and whether there are any disconnection points in the grounding connection wire;  

2. Check the continuity of the high and low voltage coils of the excitation transformer;  

3. Check the continuity of each reactor;  

4. Check the continuity of the signal line of the voltage divider;  

5. Check the continuity of the high and low voltage capacitor arms of the voltage divider;

6. If there is no resonance point when the device is boosted, it is necessary to check the on/off of the compensation capacitor;

2、 Host reset.  

Reason: Fluctuations in the power supply of the host; External strong magnetic field interference; The host is not reliably grounded;  

3、 The Q value is low, which means the voltage cannot rise or cannot rise high.  

Phenomenon:

1. The tuning curve is a curve with lower peaks;

2. During the experiment, the primary voltage is high but the high voltage is low. Even before reaching the test voltage, the primary voltage has already reached the rated voltage, and the circuit automatically steps down;  

Reason:

1. The capacitance of the reactor does not match that of the test sample, and the resonance point has not been accurately found;  

2. High sample loss and low system Q value;  

3. The high voltage output voltage of the excitation transformer is low;  

4. The high-voltage connecting wire is too long or does not use a high-voltage discharge line

Exclusion method:

1. Connect the compensating capacitor to the test circuit and increase the circuit capacitance;  

2. Connect multiple reactors in series as much as possible to increase the inductance of the circuit;  

3. Increase the output voltage of the excitation transformer;  

4. Dry the test sample to improve its insulation strength and reduce active losses in the circuit;

5. Generally, when the equipment outputs high voltage, high-voltage discharge lines are used, or ordinary high-voltage output lines are changed to shorter connections, generally not exceeding 5 meters.

4、 Power supply tripped.  

Reason: Short circuit in the resonant system circuit