High-speed train contact network is set up along the line

because the higher distance from the ground and vulnerable to lightning

EMU may lead to accidents

and threaten the safe operation of the car body electrical equipment

so it is necessary to carry out the overvoltage analysis for the train when lightning strikes the contact network.In this paper

based on the test of high-speed train circuit diagram

lightning process model of high-speed EMU is built by Pspice when lightning strikes a contact network

and it is analyzed quantitatively that the influence of the length of the grounding cable

grounding resistor parallel with capacitance and reduce the grounding resistance on the body over voltage.The results of simulation show that: arrester action

the lightning current shunt mainly through the car body

the main transformer overvoltage be effectively suppressed

while the car body potential increased substantially

and the maximum car body potential amplitude where the pantograph is

that is 3

6 car body

is about 3

6 5.07 kV

4.90 kV when parallel capacitor greater than 1.5 mF

grounding mode that resistor paralleled capacitor and directly grounding can effectively inhibit the overvoltage of each car body

and inhibition of the same

either way the overvoltage t maximum car is 3

6 car

and they are reduced to 1.90 kV

compares to the original grounding mode reduces 62.23%

61.4%

but in the way of parallel capacitor

and waveform is flatter.The conclusions provide theoretical basis for further researching lighting overvoltage of high-speed train.