高速铁路牵引供电系统短路故障牵引变压器后备保护越级跳闸分析

Analysis of Overstepping Trip of Backup Protection for Traction Transformer in Short Circuit Fault of Traction Power Supply System of High-speed Railway

通过对高速铁路牵引供电系统短路故障引起的牵引变压器后备保护越级跳闸进行深度挖掘与详细分析,重现了越级跳闸的全过程,探讨了馈线保护“盲区”的机理,找出越级跳闸的真实原因,提出了解决此类故障的方案,同时也可以看出在实际的工程应用中定值匹配设计的不足。文中的研究内容为定值设计及运营管理提供一种分析思路,为牵引供电系统故障机理分析提供重要的技术支撑,具有重要的工程应用价值。

In this paper,through the deep excavation and detailed analysis of the traction transformer backup protection overstepping trip caused by the short-circuit fault of the high-speed railway traction power supply system,reproduced the whole process of leapfrogging,revealed the mechanism of feeder protection“blind zone”,found out rootcause of the overstepping trip,proposed a solution to such failures,it can also be seen that the fixed value matching design is insufficient in actual engineering applications.The research content of this paper provides an analytical idea for future fixed value design and operation management,and provides important technical support for future failure mechanism analysis of the traction power supply system,and has important engineering application value.