一起典型的终端变电站主变压器间隙放电事故分析

针对一起110 kV线路保护末端故障导致终端变电站主变压器间隙放电的事故，通过分析、论证，认为主变压器间隙未能躲开线路保护Ⅱ段动作时间是造成间隙放电的主要原因，提出延长间隙动作整定时间的解决方案。该方案在河南省焦作地区全面实施，运行1年效果良好，能有效抑制间隙保护不正确放电，减少负荷损失。

A Typical Terminal Substation Main Transformer Gap Discharging Accident

Aiming at an accident of terminal substation main transformer gap discharging caused by protection end fault of 1 1 0 kV line and on the basis of analysis and argument,the main reason was considered to be failure of the main transformer gap in avoiding action time of Ⅱ section of line protection. Meanwhile,a solution scheme for extending gap action setting time was proposed. This scheme was comprehensively implemented in Jiaozuo region in Henan province and running well for one year which was proved to be effectively restrict wrong discharging of gap protection and reduce load loss.