Shunt capacitor bank is the major reactive power compensation devices in AC power transmission and distribution system

10 kV frame type high voltage shunt power capacitor bank is commonly used in substation.During the practical operation

the breakdown fault of capacitor internal component is the highest ratio shunt capacitor bank faults.In this paper

according to the widely using 10 kV shunt capacitor

it is analyzed the breakdown discharge quantity during the first serial and second serial capacitor internal component breakdown in the operating shunt capacitor bank.Also

it is calculated the change of breakdown transient voltage

and estimated the peak value of discharge current.The capacitor component breakdown model is built in the EMTP

therefore

it is analyzed the discharge current peak value influenced by the equivalent circuit parameter of the breakdown model.At the end

the comparison is given between the simulation result and the fault record data of the shunt capacitor bank.It is certified that the correction of the breakdown analysis and validity of breakdown simulation.The analysis result could help the real-time supervision and fast location of the fault capacitor.