The Analysis of the Opto-Couplers Relay Malfunctions in HVDC Control and Protection and the Improvements of the Trip Circuits
Due to the voltage surge and transient disturbances can cause malfunctions of the opto-couplers relay (OCR) easily, which will lead the HVDC to stop working, an optimized project to the trip circuits of HVDC control and protection is proposed. Firstly, the problems of current trip circuits are analyzed. Secondly, the trip circuits of the AC filters and DC filters are improved, as well as the DC protective trip circuits. Finally, choose other relays with better performance and more reliable to instead of the current ones, and improve the stripping link circuits of the DC filter group. The optimized project was used in the Zhaoqing converter station successfully, which is under good operating condition now.
Hao Zhang, Yang Fu and Zhong Tang
W. M. Guo et al., "The Analysis of the Opto-Couplers Relay Malfunctions in HVDC Control and Protection and the Improvements of the Trip Circuits", Advanced Materials Research, Vols. 354-355, pp. 1216-1219, 2012