As an important reactive power compensation device in power system

the safe and reliable operation of power capacitor is beneficial to enhance stability of power system

improve power quality and reduce power loss of power grid.However

the fault of capacitor is sometimes happened due to such factors as manufacturing quality

design of compensation circuit

system harmonics and operating environment

power capacitor failures.In order to ensure the safe operation of equipment and power grid

the mechanism of common fault of capacitor is analyzed firstly in this paper

the feature and reason of such fault are defined.Finally

corresponding preventative measure for such faults is proposed from such five aspects as installation and adjustment quality

operation mode

control of operation ambient temperature

on-line monitoring of operation status and daily patrol.