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Strictly control the operating voltage to prevent capacitor failure


Release time:

2019-06-29

The operating voltage of shunt capacitors must be strictly controlled within the allowable range. That is, the long-term operating voltage of the shunt capacitor shall not be greater than 10% of its rated voltage. If the operating voltage is too high, the service life of the capacitor will be greatly shortened. With the increase of the operating voltage, the dielectric loss of the shunt capacitor will increase, the temperature of the capacitor will rise, the aging speed of the capacitor insulation will be accelerated, resulting in premature aging of the capacitor insulation, breakdown and damage. In addition, under the action of excessively high operating voltage, the insulating medium inside the capacitor will undergo local aging. The higher the voltage, the faster the aging and the shorter the service life.

The operating voltage of shunt capacitors must be strictly controlled within the allowable range. That is, the long-term operating voltage of the shunt capacitor shall not be greater than 10% of its rated voltage. If the operating voltage is too high, the service life of the capacitor will be greatly shortened. With the increase of the operating voltage, the dielectric loss of the shunt capacitor will increase, the temperature of the capacitor will rise, the aging speed of the capacitor insulation will be accelerated, resulting in premature aging of the capacitor insulation, breakdown and damage. In addition, under the action of excessively high operating voltage, the insulating medium inside the capacitor will undergo local aging. The higher the voltage, the faster the aging and the shorter the service life.

If the long-term operating voltage of shunt capacitor is higher than 20% of its rated voltage, its service life will be about 0.3 times of the normal condition.

Therefore, the rated voltage should be reasonably selected according to the actual situation of the operating voltage of the local power grid, so that the long-term operating voltage is not greater than 1.1 times of the rated voltage of the capacitor. Of course, the actual operating voltage is too low is very unfavorable, because the output reactive power of the shunt capacitor is proportional to the square of its operating voltage. If the running voltage is too low, the reactive power output of the capacitor will be reduced, and the task of reactive power compensation can not be completed, and the function of the shunt compensation capacitor will be lost. Therefore, in the actual operation, we must try to keep the shunt capacitor running voltage at 95% ~ 105% of its rated voltage for a long time, and the maximum operating voltage shall not be greater than 110% of its rated voltage

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