The complete set offrequency conversion series resonance test equipmentis based on the working principle of the resonant frequency conversion series resonance test equipment. The AC 220V power supply outputs a frequency conversion voltage of 30-200Hz through the frequency conversion control unit, which is sent to the excitation transformer and boosted to 0-1000V to form a high-voltage main harmonic circuit. The capacitive voltage divider is a pure capacitive type used for measuring the test voltage. Firstly, the variable frequency control unit is fed into the main resonant circuit with a lower voltage Ue through an excitation transformer. When the frequency meets the condition Ω L=1/Ω C, the output frequency of the variable frequency control unit is adjusted, that is, the circuit reaches the resonant state.

At this point, under a smaller excitation voltage UE, a voltage UCX several tens of times that of UE can be generated on the tested object Cx. The frequency conversion testing system is based on the principle of series resonant circuit, and the resonant point is achieved by adjusting the frequency of the frequency converter to the natural frequency of the series resonant circuit. After circuit resonance, the output voltage waveform is a pure sine wave. The frequency of the system depends on the L-C parameter of the circuit, and the reactance value of the reactor is adjustable. The frequency of the system depends on the size of the load capacitance. According to the size of CX, adjust the inductance L value of the reactor appropriately to fix the resonance frequency within the required range. The complete set offrequency conversion series resonance test equipmentmeets the test samples that must be carried out under AC withstand voltage test power frequency conditions.

The complete set offrequency conversion series resonance test equipment can be seen from the above working principle:

1. The higher the quality factor, the smaller the power capacity.

2. The resonant reactor L resonates with the specimen CX, forming a good filtering circuit. Therefore, the output voltage UCX is a good sine waveform.

3. When the tested cable of the device malfunctions, it will lose resonance conditions and instead reduce the current of the high-voltage circuit and low-voltage power supply circuit, so that the arc at the insulation breakdown point will not expand the fault point, making maintenance easier.