500kV主变后备保护联跳分段开关的二次回路改进建议

Secondary Circuit Improvement Suggestion of 500 kV Main Transformer Standby Protection Shunt Tripping Subsection Switch

双母双分段220 kV母线接线方式在倒闸操作等特殊运行方式下,提高了保护拒动或误动的风险。在分析了接入刀闸辅助接点来自动切换跳闸回路的基础上,提出了一种基于保护装置平台的改进思路,即在跳闸逻辑中增加刀闸位置的判据。该方法在微机保护装置中简单易行,便于现场人员快速判断刀闸辅助接点的分合以及整个跳闸出口回路的完好性、正确性,提高了变压器后备保护的可靠性。

Under tripping operation etc special running modes, the 220 kV bus bar connection method of double bus bar double subsection had raised protection misguiding or mis-tripping risks. On the basis of analyzing automatic switching tripping circuit connected by auxiliary contractors, this paper raised an improved idea based on protection device platform, that was to say that a judgment of tripping logic was added into knife blade position. The method is simple and easy in microcomputer protection device, easy for onsite working personnel to quickly judge making and breaking of knife blade auxiliary contractors, as well as the integrality and correctness of entire tripping, which raises the transformer standby protection reliability.