A capacitor is a component that holds a charge, and a capacitor is one of a large number of electronic components used in electronic devices. A voltage is established between the plates of the capacitor to accumulate electrical energy. This process is called charging of the capacitor. There is a certain voltage across the charged capacitor. The process in which the charge stored by the capacitor is released into the circuit is called the discharge of the capacitor.
1. Capacitor circuit breaker automatic trip abnormality processing method
Capacitor circuit breaker trip faults are generally fast-break, over-current, over-voltage, voltage-loss or differential voltage protection (ie, the capacitor group star connection is connected to the voltage transformer primary coil between the neutral point and the ground, and the secondary coil is connected to the opening. The differential voltage protection of the triangle) action. After the circuit breaker trips, it must not be forced. At this time, the protection action should be checked first and the primary circuit should be checked, such as checking whether the capacitor has an explosion, drum belly or fuel injection. The capacitor circuit breaker, voltage transformer, power cable, etc. are inspected to determine the nature of the fault. If there is no such situation, the circuit breaker will trip due to the bus voltage fluctuation caused by the external fault, and the test closing will be allowed after 15 minutes.
Second, the capacitor shell expansion abnormal treatment method
It is normal for the capacitor tank to expand and contract with temperature. However, when partial discharge occurs inside, the insulating oil will generate a large amount of gas. The plastic deformation of the box wall is obvious, causing partial discharge of the capacitor, mainly due to excessive operating voltage or operating overvoltage caused by re-ignition of the circuit breaker and low quality of the capacitor itself. In addition, the capacitor is caused to expand because the ambient temperature exceeds 40 ° C, especially in the summer or when the load is heavy, strong ventilation should be used to reduce the capacitor temperature. If the capacitor is deformed, the inspection should be stopped in time.
Third, the capacitor leakage oil abnormal treatment method
The capacitor is a fully sealed device. If the sealing is not strict, air, moisture and impurities may intrude into the interior of the fuel tank, which is extremely harmful. Therefore, the capacitor is not allowed to leak oil.
When the capacitor leaks oil, it should reduce the load or reduce the ambient temperature, but it is not suitable for long-term operation. If the running time is too long, such as the outside air and moisture will penetrate into the capacitor to reduce the insulation, the capacitor will be insulated and breakdown. When the duty officer finds that the capacitor is seriously leaking oil, it should immediately report it, disable it, and check it.
Fourth, capacitor ceramic bottle surface flashover discharge abnormal treatment method
The flash capacitor discharge of the capacitor porcelain in operation is due to defects in the porcelain insulation and surface contamination. Therefore, cleaning should be carried out regularly during operation, and capacitors should not be installed in dirty areas.
Post time: Aug-27-2018