Calculation and analysis of induced current of open circuit breaker in 500 kV substation
The induced current will be generated in the circuit formed by the open circuit breaker and the ground wire.In this paper,the induced current of the circuit breaker,cable,ground grid and the fluid circuit composed of two ground wires and ground cutters in the 500 kV switching field of the substation is measured firstly.Then,the power frequency magnetic field of the 500 kV switching field of the substation is simulated respectively in the normal working state and during maintenance.The results show that the peak-to-peak value of the induced current generated by the fluid circuit of the circuit breaker in the 500 kV switching field is in the range of 3.85-7.33 A under maintenance condi-tion.In normal working state,the magnetic induction intensity of the switching field ranges from 0.260 μT to 7.480 μT,and the maximum value of the power frequency magnetic field intensity is mainly distributed at the intersections of wires.The magnetic induction intensity of the switching field ranges from 0.440 μT to 8.760 μT under maintenance condition,and the higher value of power fre-quency magnetic field intensity is mainly distributed below the second bus.The research results can provide reference for the safety operation of overhaulers of open circuit breakers.
500 kV substationopen circuit breakerpower frequency magnetic fieldinduced currentsimulation analysis
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