The harmonic of the network is the main cause leading to fault of compensating capacitor in service.The increase of harmonic contents will lead the r.m.s value of the current flowing through the capacitor increase

accordingly resulting in an increase of its heat

thus accelerating thermal aging and reducing endurance of capacitor.In this paper

35 kV shunt compensation capacitor of a 500 kV substation is taken as an example by the author

the influence of 3rd harmonic and 5th harmonic content to the current r.m.s value is calculated

the limit of harmonic content of the capacitor is proposed as per standard and control in the operation.