A series resonance test system is a highly specialized system used to test the resonant frequency of electrical equipment. This system is widely used in the electrical industry to detect faults in electrical equipment and to ensure the safety and reliability of power systems.
The system operates on the principle of series resonance, which is achieved when the inductance and capacitance in a circuit are balanced to resonate at a specific frequency. In this state, the impedance of the circuit is at a minimum, and the voltage and current in the circuit are at their maximum values.
High Voltage Reactor
A high voltage reactor comprises the heart of the system. The reactor is oil-insulated and consists of two identically wound high voltage coils mounted on a special core provided with fixed air gaps. The air gaps lie within the coils to reduce flux fringing. The core is mounted permanently to a frame that is mounted in a cylinder. The upper part of the high voltage reactor includes space for oil expansion with an oil level indicator. Output of the reactor is via high voltage electrode.
High Voltage Divider
A capacitive high voltage divider is provided for accurate measurement of the output voltage. Connection from divider to system is a coax cable.
Exciter
The exciter section contains a two-winding, single-phase, step-up transformer that supplies the AC voltage required for the resonant circuit. It is mounted in a separate oil-filled steel tank provided with input and output bushings. The output voltage and power of the exciting transformer are normally equal to the rated output data of the test set divided by the Q factor (See Technical Specifications).
Variable Frequency Power Supply
The variable frequency power supply provides an adjustable input voltage and adjustable frequency to the exciter and controls the output voltage of the high voltage reactor from near zero to full voltage. The variable frequency power supply is controlled by a microprocessor which operates the
inverter section. In addition to the solid-state voltage control circuitry, the regulator is also equipped with a main circuit breaker, main contactor, and electronic overload sensing. The entire assembly is housed in the control room enclosure.