The series resonance under UHV power can help many power workers conduct various power tests more conveniently.

The principle of the complete set of frequency conversion series resonance test equipment

According to the principle of series resonance and the output characteristics of the excitation transformer, the series resonance circuit was excited. By adjusting the output frequency of the frequency converter controller, resonance occurs between the inductance L in the circuit and the test object C. Resonance voltage is the voltage applied to the test object.

Test object of the complete set of frequency conversion series resonance test equipment

The complete set of frequency conversion series resonance test equipment is the most effective method for on-site inspection of the quality of cross-linked cable laying and accessory installation, which can meet the AC withstand voltage requirements of 10kV-500kV high-voltage cross-linked cable series parallel reactors on site.

Principle analysis of the complete set of frequency conversion series resonance test equipment

In an AC circuit with resistor R, inductor L, and capacitor C components, the voltage across the circuit is usually different from the current phase. If the parameters (L or C) or power frequency of the circuit components are adjusted, they can be in phase, and the entire circuit exhibits pure resistance. When the circuit reaches this state, it is called resonance. In the resonant state, the total impedance of the circuit reaches or approximates its maximum value, fully utilizing the resonance characteristics in science and application technology to prevent its harm. Depending on the different connection methods of the circuit, there are two types of series resonance and parallel resonance. In a series circuit composed of resistors, inductors, and capacitors, when the capacitor XC is equal to the inductor XL, i.e. XC=XL, the phase of the voltage U and current I in the circuit is the same, and the circuit exhibits pure resistance. This phenomenon is called series resonance (also known as voltage resonance). When the circuit undergoes series resonance, the impedance Z=R2+XC-XL2=R, the total impedance of the circuit is minimized, and the current will reach its maximum value.