Relevant content overview about low voltage power capacitor

For low voltage power capacitor, before installing the capacitor better capacitor, capacitor manufacturer should be assigned a capacitor, the phase equilibrium, the deviations should not exceed 5% of its total capacity. Equipped with relay protection devices, should also meet the balance in the operation of the current error is not more than the requirements of relay protection action current. When selecting a capacitor set of switch equipment should follow the principles: ( 1) Should be used without having to burn can cut off the capacitive current of the breaker. ( 2) Rated current of the circuit breaker rated current of capacitor set should be at least 3 times. ( 3) Open circuit current rating of the breaker shall not be less than three phase short circuit current cycle breaker actual open circuit time component of RMS ( The action time of the relay protection combined with the inherent open circuit breaker time) Circuit breaker. ( 4) Circuit breaker short-circuit current should not be less than the rated current access to the peak value of intoxication, should not be less than charging capacitor set is put into operation flow peak. ( 5) For indoor low voltage capacitor Banks under 50 kw, ironclad switch should be adopted to control; For more than 50 kw low voltage capacitor Banks, according to the specific situation adopt automatic air switch or ac contactor. In the operation of the 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.

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