Causes of High Voltage Capacitance damage in Summer

Reason one: operating voltage is too high

I believe many engineers are aware that the high voltage capacitor operating voltage can reflect the substation bus system voltage, and directly affect the capacitor life and function. The active power loss in the operation of high voltage capacitor is mainly composed of dielectric loss and conductor resistance loss. The dielectric loss can account for more than 98% of the total power loss of HV capacitors.

      In addition, since the active power loss of the high voltage capacitor is proportional to the square of the operating voltage of the reactive power capacitor, the active power loss of the high voltage capacitor will increase rapidly with the increase of the operating voltage, and then the temperature will rise. The speed will also increase, which will reduce the insulation life of the capacitor. In addition, the continuous operation of high voltage capacitors is generally determined as 1.10 times of rated voltage, when the capacitor is running under overvoltage for a long time, it will cause the capacitor to produce overcurrent and be damaged. Therefore, high voltage capacitors need to be equipped with perfect overvoltage protection device.