In a series circuit of resistors, capacitors, and inductors, the phenomenon of power supply, voltage, and current being in phase occurs, which is called series resonance. Its characteristics are: the circuit is purely resistive, the power supply, voltage, and current are in phase, the reactance X is equal to 0, and the impedance Z is equal to the resistance R. At this time, the impedance of the circuit is the smallest and the current is the largest, which may generate high voltage on the inductor and capacitor that is many times larger than the power supply voltage. Therefore, series resonance is also known as voltage resonance.
The resonance voltage is superimposed with the original voltage, and parallel resonance: In parallel circuits of resistors, capacitors, and inductors, the phenomenon of the circuit terminal voltage and total current being in phase is called parallel resonance. Its characteristics are that parallel resonance is a complete compensation, and the power supply does not need to provide reactive power, only the active power required by the resistor. During resonance, the total current of the circuit is minimized, and the branch current is often greater than the total current in the circuit. Therefore, parallel resonance is also called current resonance.
The series resonance device uses the latest AC voltage withstand test equipment designed using the principle of series resonance. A set of series resonant voltage withstand test equipment that can perform AC voltage withstand tests on power transformers, cross-linked cables, switchgear, motors, generators, GIS and SF6 switches, busbars, bushings, CTs, PTs, and other test samples. It is a versatile AC voltage withstand equipment. Tuopu United Power Frequency Conversion Series Resonance is one of the few devices in China that has passed strict type testing and identification by the national authoritative department - the Quality Inspection and Testing Center for Electrical Equipment in the Power Industry (Wuhan High Voltage Research Institute). Its reliable quality ensures the safety of testing personnel, test subjects, and testing equipment themselves.