What are the types of series resonant devices?

There are several types of series resonance equipment:

1. AC withstand voltage resonance test device:

This type of equipment can meet the AC withstand voltage test of capacitive equipment such as transformers, GIS systems, SF6 switches, cables, and bushings according to regulatory requirements. It can meet the requirements of high voltage and low current equipment testing conditions, as well as low voltage and high current equipment testing conditions, so it has a wide range of applications.

2. Variable frequency series resonance test device:

This is a cable specific series resonant device that adjusts the frequency of the power supply to achieve resonance between the reactor and the tested capacitor, thereby obtaining high voltage and large current on the tested object. This method has been widely used in the withstand voltage test of various types of cables up to 35KV both domestically and internationally.

3. Resonance testing device for CVT inspection:

This includes resonant boost devices for CVT inspection, variable frequency resonance, variable frequency series resonance, series resonance transformers, etc., mainly used for the inspection and testing of CVT (capacitive voltage transformers).

In addition, from the perspective of output parameters, series resonant devices can be divided into high voltage and high current types. High voltage type is mainly used for equipment such as ultra-high voltage GIS, high-voltage circuit breakers, transformers, cables, and coupling capacitors; High current type is suitable for large capacity equipment such as water turbines, steam turbine generators, distribution network cables, and power capacitors.

From the perspective of tuning methods, it can be divided into sensing type and frequency modulation type. Inductive regulation type is to change the inductive reactive power capacity by adjusting the inductance of the reactor, so that it is as equal as possible to the capacitive reactive power capacity value in the series circuit, so that the circuit reaches a resonant state; The frequency modulation type is to fix the inductance of the reactor, adjust the frequency of the resonant circuit, and make the inductive reactive power capacity value as equal as possible to the capacitive reactive power capacity value at the same frequency, achieving the resonant state of the circuit.

ZCVF-A series frequency conversion series resonant AC withstand voltage device is suitable for AC withstand voltage test of transformer, circuit breaker, switch, GIS system, cable, bushing, insulator and other equipment. It has the functions of high voltage over-voltage protection, low voltage over-current protection, detuning protection, zero position protection, flashover protection, emergency shutdown, under-voltage protection and so on. It not only meets the requirements of equipment test conditions for high voltage and small current, but also meets the requirements of equipment test conditions for low voltage and large current, and has a wide application range.

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