VX接线方式下的高速铁路异相短路保护研究

Study on Protection of Wrong Phase Short Circuit for High Speed Railway with VX Connection Mode

随着铁路的进一步提速,为加强系统供电能力,高速铁路普遍采用VX接线的全并联供电方式,电分相装置逐渐由器件式向锚段关节式转换,由于电分相结构不同,拉弧导致的异相短路机制也存在较大差异。本文通过对传统馈线保护动作进行分析,在修正电弧模型的基础上提出适用于高速铁路的异相短路保护方案,并仿真验证了在不同电弧长度、两供电臂轻载及重载等工况下该保护方案的正确性及可靠性。

Along with the further raising of railway running speed,with targeting of strengthening the system power supply capability,high speed railways adopt extensively the full parallel power supply mode with VX connection,along with electrical sectioning devices of component type transformed to the overlap section type;the arcing of the different structure of electrical sectioning devices lead to the great differences of wrong phase short circuit mechanisms.With analyzing of traditional feeder protection actions and on the basis of modification of electric arc model,the paper puts forward the scheme adaptable for protection of wrong phase short circuit of high speed railway,its correctness and reliability have been verified through simulation and verification under working conditions of different electric arc lengths,light load and heavy load of the two power supply sections.