In terms of the circuit structure, the frequency divider is essentially a LC filter network composed of capacitors and inductor coils, and the high tone channel is a high pass filter, which only allows the high-frequency signal to pass through and blocks the low-frequency signal. The bass channel, o

Temperature rise will seriously affect the service life of capacitors,and even lead to insulation breakdown and other accidents, which will damage the capacitors.

The damage of shunt capacitor is usually caused by two aspects: the electric breakdown and thermal breakdown. The direct performance of the main body bulging deformation, external fuse or internal fuse and related protective actions.

In recent years, the failure rate of 10 kV shunt capacitor banks in substations has increased. In 2017, 39 capacitor bank failure occurred in 62 groups of 10 kV shunt capacitors in 26 110kV and above substations under the jurisdiction of Xinghua Operation and maintenance Station. The damage of shunt

Medium loss angle is too large. For those long-running capacitors, the dielectric loss angle will increase, but the increase will not be very large, if there is a phenomenon of multiple growth, there must be a failure. This phenomenon is usually caused by partial overheating and partial discharge.

An excessive capacitance. In the test of service life, the capacitance will not change much when the voltage is heated for a long time. If the capacitance value rises suddenly, the reason can only be judged as a short circuit caused by the breakdown of the capacitor component part. This is because c

Seep oil.This is a frequent phenomenon in the operation of capacitors, which is mainly due to the sealing is not firm or tight. The capacitor should be a fully sealed device, once the seal is not strict, there may be air, moisture and other impurities into the inside of the tank, causing damage to i

Method of judging complete demagnetization(1) In the process of rising and falling of voltage, the excitation current value of the same voltage is the same;(2)The waveform of the excitation current is symmetrical up and down, and there is no even harmonic component.

Ac method: apply 50Hz AC voltage between the low-voltage side of the tested transformer (such as generator, high voltage neutral point grounding). According to the power supply capacity, adjust the compensation capacitor C, reduce the power supply current, the low-voltage side of the test to reflect

DC method: according to the electrical theory XHXC105 demagnetizer is a direct current through the reverse direction, and gradually reduce, decrease the hysteresis loop of the core, to eliminate the purpose of residual magnetism. Direct current is passed into the high-voltage winding of the tested t