线路故障引发多台变压器间隙保护动作分析

Analysis of Multiple Transformer Gap Protection Actions Caused by Line Faults

针对大规模新能源接入导致电网运行方式及故障发展过程复杂的情况,结合一起110kV线路故障引发多台变压器间隙保护动作的案例,介绍了变压器间隙保护的原理、构成和整定原则,分析了故障发展过程中110kV系统各级保护装置的动作行为,重点阐述了中性点接地运行方式变化过程中110kV系统母线和零序电压的变化规律,总结了整定110kV间隙保护动作时间定值时需要考虑的因素,为电网故障分析及变压器间隙保护整定提供了工程实践参考。

In response to the complex operation mode and fault development process of the power grid caused by the large-scale integration of new energy,along with a case involving multiple transformer gap protection actions caused by a complex fault on a 110 kV line.This article introduces the principles,composition,and setting principles of transformer gap protection.It analyzes the operational behavior of various protection devices within the 110 kV system during the development of the accident.The article focuses on changes in the busbar and zero-sequence voltage of the 110 kV system resulting from alternations in the neutral grounding operation mode.Additionally,it summarizes the factors to be considered when setting the operating time of the 110 kV gap protection,providing practical engineering insights for power grid accident analysis and transformer gap protection configuration principles.