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What is the cause of the low voltage power capacitor capacity value attenuation

by:SMiLer     2022-01-12
The operation of the power capacitor in low voltage power capacitor, attention should be paid to the following questions: under the working voltage of electric power capacitor voltage is very sensitive, because is proportional to the square of the loss and the voltage of the capacitor, overvoltage will lead to serious, condenser heat accelerated aging. Capacitor insulation, shorten the life, and even breakdown. Power grid voltage generally should be lower than the rated voltage of capacitor itself, not more than 0% of the nominal voltage. Therefore, when the working voltage is twice the rated voltage, cooling measures must be taken. In magnetic saturation regulator, large rectifier power grid and electric furnace installation power capacitor, its working current and harmonic problems can result in higher harmonic in communication. For the NTH harmonic, the reactance of the capacitor will be the base/n. Does great harm to harmonic on the capacitor current, therefore, it is easy to make the capacitor fails, the interphase short circuit. Considering the existence of harmonic, regulation should not exceed the rated working current of capacitor current of 1. Three times. When necessary, should be on the capacitor in series with the appropriate induction reactor, to limit the harmonic current. Closed because of power capacitor group, especially high voltage capacitor Banks, especially in high voltage capacitor connected to the power grid, the impact current is bigger, so closed the arc problem in power capacitor group will appear on the switch or converter. In this case, the value of the electric capacity of capacitor set should be adjusted or replaced converter. Series reactor can be used to eliminate the high voltage capacitor. What is the cause of the low voltage power capacitor capacity value attenuation 1, high temperature aging if the operating temperature is too high, the internal components of high temperature ageing phenomenon happens, the service life of the metallized film will decay, capacitance value falls wait for a problem. If the overvoltage run run 2, over voltage, running temperature rise with a certain degree of degree, if run over voltage for a long time, capacitor operation beyond the scope of design temperature will shorten the service life of the capacitor, at the same time can also cause attenuation capacity value. 3, over-current operation on the market at present self-healing type low voltage power capacitor mostly for capacitor, the flow is run, metallized film will exist within the electric breakdown phenomenon, resulting in a decrease of metallized film available area, the capacitance value will trace attenuation, if electric breakdown time too much, will cause serious attenuation capacity value 4, overload operation while low voltage power capacitor can overload operation, but there is time, voltage and current limit, if run overload for a long time, will cause the capacitor breakdown frequency is too high, the internal temperature rise, cause the service life of the capacitor, capacitance value serious decline, even failure.
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