With the extensive use and long-term operation of capacitors, the failure of capacitors is also frequent. For the long-term stable operation of the power grid, the preventive measures for capacitors mainly have the following five aspects

First, strengthen inspection, inspection and maintenance of shunt capacitors should be inspected regularly, at least once a quarter, mainly to check whether there is dirt such as dust accumulation in the capacitor shell, porcelain bushing, installation bracket and other parts, and carefully clean. When checking, special attention should be paid to whether the connection of each connection point is firm or loose; Whether the shell is bulging, leaking (leaking) oil, etc. If the above phenomenon is found, the capacitor must be withdrawn from operation and properly handled.

Second, control the operating temperature, in a normal environment, the general requirements of the shunt capacitor shell. The temperature of the hot spot must not exceed 60 degrees.

The operating voltage of the shunt capacitor 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, and the operating voltage is too high, which will greatly shorten the service life of the capacitor.

Fuse protection should be set for each single capacitor, requiring that the rated current of the fuse should not be greater than 1.3 times of the protected rated current, so as to avoid the failure of a capacitor, due to not timely removal caused by the occurrence of group explosion accidents.