In a series circuit consisting of capacitors, resistors and inductors, it is common for the voltage, power supply and current to be in phase. This situation is usually referred to as series resonance. The most prominent feature is that the current, voltage and power supply are in phase, and the circuit is purely resistive. When the reactance X equals zero, the resistance R is equal to the impedance Z. Therefore, voltage resonance is also called series resonance.
The series resonance device is actually a new type of AC withstand voltage testing equipment designed based on the basic theory of series resonance. The series resonance withstand voltage testing equipment can simultaneously conduct AC withstand voltage tests on various test samples such as cross-linked cables, power transformers, motors, switch cabinets, GIS and SF6 switches, generators, busbars, bushings, CTs, PTs, etc. This series resonance device is a multi-purpose AC withstand voltage equipment. The HVHIPOT Variable Frequency Series Resonance of HV HIPOT is currently one of the few equipment in China that can meet the strict type test and appraisal requirements of the national authoritative department – the Electrical Equipment Quality Inspection and Testing Center of the Electric Power Industry. It has passed quality inspection and can significantly ensure the safety of the test personnel, the test equipment, and the tested samples themselves.
Resonant voltage is superimposed with the original voltage, and parallel resonance: In a circuit with resistors, capacitors, and inductors connected in parallel, the phenomenon where the voltage at the circuit terminals and the total current are in phase occurs, which is called parallel resonance. Its characteristics are: Parallel resonance is a complete compensation. The power source does not need to provide reactive power; it only needs to provide the active power required by the resistance. During resonance, the total current of the circuit is the minimum, while the branch currents are often greater than the total current in the circuit. Therefore, parallel resonance is also called current resonance.
Through the above-mentioned multiple series resonances and parallel resonances, a simple yet comprehensive comparison has been made. Everyone should have a general and comprehensive understanding of the two connection methods of resonances. If there is any need to consult other relevant materials, they can be found in other sections of the Guodian Xi Gao official website: www.hvhipot.com.
Post time: Jun-15-2026