By hvhipot 
A series resonant circuit refers to the phenomenon in an electronic series circuit where the resistance, inductance, and capacitance exhibit the same phase angle as the voltage, current, and power supply, and is called an electronic circuit series resonant circuit.
The characteristics of a series resonant circuit are: the series resonant circuit is purely resistive, and the power supply, voltage, and current are in phase. At this time, the reactance is equal to 0, the impedance is equal to the resistance R, the impedance of the circuit is the smallest, the current is the largest, and the resonant voltage is superimposed with the original mutual voltage, producing a high voltage on the inductance and capacitance that is many times higher than the output voltage of the power supply. Therefore, the series resonant circuit is also known as a voltage resonance test item.
Parallel resonant circuit refers to the phenomenon in which the voltage at the circuit terminals and the total current have the same phase angle in a resistor, inductor, and capacitor parallel circuit, known as an electronic circuit parallel circuit.
The principle and characteristics of parallel circuits are: parallel resonance is a complete compensation circuit, and the power supply does not need to provide reactive power, only the active power required by the resistors in the parallel circuit. When the output produces a resonant circuit, the total current generated by the parallel circuit is the smallest. At this time, the branch current is greater than the total current in the circuit. Therefore, parallel resonance circuit is also called parallel resonance or current resonance.
The series resonance and parallel resonance test equipment can simultaneously meet the (power frequency) AC withstand voltage test of power transformers, cross-linked cables, switchgear, motors, generators, GIS full gas insulated composite electrical equipment, SF6 switches, busbars, capacitor sleeves, oil filled sleeves, current transformers (CT), voltage transformers (PT) and other test objects. The series resonance and parallel resonance test equipment is a composite AC withstand voltage equipment.
HV Hipot Electric Co., Ltd. specializes in the production of series resonance (also known as series resonance withstand voltage device) and has been engaged in the electrical measurement industry for many years. Its products have first-class quality and welcome customers to come and purchase.