随着电网改造工作的不断深入,越来越多的变电所实现了保护装置的微机化。尽管微机保护装置具备了 PT、CT断线的自检、报警功能,但是二次回路定期巡视时还须检查电流回路。以我局红光变电所发现的一例 CT断线为例。由于长期处于潮湿的环境中,110kV 台光线757开关端子箱内保护电流回路中的一根独股铜线与端子排相连的根部锈断,但仍以间歇拉弧的方式保持电流回路的沟通,二次巡视时在 With the continuous deepening of the grid transformation work, more and more substations have realized the protection of the microcomputer. Although the microprocessor-based protection device has PT, CT disconnected self-test, alarm function, but also check the secondary circuit regularly tour the current loop. Take one case of CT disconnection found by Hongguang substation of our bureau as an example. Due to the long-term wet environment, the root of a single copper wire in the protective current loop of the 110kV Taichung 757 switch terminal box is connected to the terminal block to get rusty, but the circuit of the current loop is still intermittently arc-drawn, In the second visit at