Power capacitor

as an important reactive power compensation device

is responsible for providing reactive power support to the power network

improving the voltage quality

and reducing network loss.However

frequent fault of the power capacitor due to influence of such multiple factors as its quality itself

parameter configuration and operation environment etc seriously affects safe and economic operation of the network. In this paper

the form and formation mechanism of various faults are described systemically with combination of the actual operation condition of the capacitor equipment proper. The main factors leading to the fault of capacitor bank is weak quality of the capacitor and its accessories

harmonics

operation overvoltage and unreasonable installation position

finally

the corresponding prevention measures are given.