摘要
为了解决地铁直流馈线保护仅仅利用单端数据,从而在远端故障时保护动作时间长、易发生拒动或误动问题,分析了馈电区段两侧电流与线路(负荷)电流的分布关系,提出了利用独立馈电区段双端电量数据的一种'区段域保护'方法,将独立馈电区段内两端的各种保护测量数据通过光纤等通信手段实现采集数据的同步共享、进行综合域处理(计算)后实现全新的保护判据。给出了独立馈电区段的构成原则,提出了利用两端电流之和的'和电流'保护原理、阻抗保护原理、双端联跳原理。最后,给出了具体实现方法。该方法可实现直流馈线全线速动,提高了地铁直流供电系统保护的快速性、灵敏性和可靠性。
The deficiency of the metro direct-current feeder protection is mainly attributed to the application of single-ended current as the sole method in the detection and identification of breakdowns, which is time-consuming in case of remote short circuit and is very likely to fail or make mistakes. Therefore, by evaluating the distribution relationship between the side currents and line or load current, this paper proposes a segment domain protection method. Through this method, the protection measurement data at both sides of independent feed segment cart be shared synchronously via optical fiber, and brand new protection criteria can be realized after a comprehensive domain processing. This paper presents the composition principles of independent feeder section and consequently proposes the ＂sum current＂ protection principle utilizing the sum of two ends＇ currents, impedance protection principle and double-ended tripping protection principle. In the end, approaches to realizing those protection principles are provided. The method can realize the entire DC feeder quick-action, which improves the speed, sensitivity and reliability of the Metro direct-current feeder protection.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第22期135-138,共4页
Power System Protection and Control
关键词
地铁直流保护
轨道交通
直流牵引
电流上升率
电流增量
metro DC protection
rail transit
DC traction
rate of current rise
increment of current
