The necessity of self-checking technology for arc transmission channel in arc flash relay of medium-voltage and low-voltage switchgears is described. The principle and methods realizing self checking for arc transmission channel by superimposing pulse light are introduced. It is theoretically analyzed that the recursive median filter algorithm can eliminate the influence of pulse light, and the deviation of pulse light to background light is also estimated. The test shows that in the premise of no misoperation of the device, the method can realize real-time self-checking for arc transmission channel, which can improve the reliability of arc flash relay.
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王 杰,侯 炜,陈 俊,牛洪海.弧光保护通道自检技术的应用研究[J].四川电力技术,2022,45(1):36-39. WANG Jie, HOU Wei, CHEN Jun, NIU Honghai. Application Research of Channel Self Checking Technology in Arc Flash Relay[J]. SICHUAN ELECTRIC POWER TECHNOLOGY,2022,45(1):36-39.