667 / 2017-05-25 10:28:59

Simulation and Fault Analysis of 500 kV MRTB DC Switch

12931,14513,14518,3589

The metallic return transfer breaker (MRTB) is a key apparatus to break the DC current in 500 kV HVDC converter stations. It is usually used for monopole-ground operation mode/ bipolar operation model transferring. In this paper, an actual occurred fault of 500 kV HVDC switches in HVDC converter station is presented in details. In order to analyze the complicated transient performance, a simulation with Mayer arc model is carried out. The transient oscillation process of arc current, charging process after the arc, and the discharging process with arc current flowing through the arrester are simulated by using Matlab. For the sake of verifying the simulation results, steady-state current in on-site measurement current and the oscillation current waveform carried out in field test in low voltage are obtained. The design parameters of the switch are analyzed and the failure processes are solved finally by using the calculating model.
In this paper, the computing method, field test results, actual failure details and recovering suggestion are presented, which might be of some help to manufacture of 500 kV MRTB DC breaker in parameter design and give some suggestions to power company in grid operation.