地铁牵引供电系统保护

根据自身实践，阐述牵引变电所两种不可或缺的保护——牵引变电所内部联跳保护、开关失灵拒动保护；提出迅速切断电源是一切继电保护的最终目的，直流电路尤其如此；在短路电流上升过程中迅速切断电源，是直流保护应当遵循的基本原则；分析牵引网保护上“死区”形成的原因，提出为使馈线开关保护更加完善、列车运行更加安全，直流馈线应设开关失灵拒动保护。

Protection of Metro Traction Power Supply System

Based on the experience of the author in metro projects, two kinds of protection methods for traction substation are put forward, that is, inter - tripping of breaker and breaker failure, and tripping - disabled protection. Immediate power supply cut - off is the ultimate aim of relay protection, especially for the DC system. The principle that the short circuit current should be cut off in its rising process should be followed in the protection of DC system. Some causes to skip area of traction system protection are analyzed. In order to perfect the protection of feed breaker, the tripping - disabled protection for failure of breaker should be installed in feed breaker of DC system to guarantee the safety of train operation.