Wuhan UHV specializes in producing series resonance (also known as cable withstand voltage test equipment). Next, we will share with you an introduction to the series resonance withstand voltage device.

Composition of series resonant device

Series resonance is mainly composed of a frequency conversion series resonance test console, excitation transformer, high-voltage reactor, high-voltage voltage divider, etc.  

Principle of series resonant device

Series resonance is the application of the principle of variable frequency resonance, which uses an excitation transformer to excite a series resonant circuit, adjusts the output frequency of the variable frequency controller, and causes the circuit inductance L and the test sample C to resonate in series. The resonant voltage is the voltage applied to the test sample.  

Analysis of the principle of series resonance device

In an AC circuit with resistance R, inductance L, and capacitance C, the voltage at both ends of the circuit is generally different from the phase of the current in the resonant circuit. If we adjust the parameters or power frequency of circuit components (L or C), we can make their phases the same, and the entire circuit appears purely resistive. When a circuit reaches this state, it is called resonance.

The resonant voltage withstand device consists of a variable frequency power supply, excitation transformer, reactor, and capacitive voltage divider. The capacitor and reactor of the test sample form a series resonant connection; The voltage divider is connected in parallel to the test sample to measure the resonant voltage on the test sample and provide an overvoltage protection signal; The frequency modulation power output is coupled to the series resonant circuit through an excitation transformer, providing excitation power for series resonance. The variable frequency series resonance test device uses the principle of series resonance, excites the series resonance circuit with an excitation transformer, adjusts the output frequency of the variable frequency controller, and causes the circuit inductance L and the test sample C to resonate in series. The resonance voltage is the voltage applied to the test sample