城市轨道交通配电系统层级保护整定配置方法

Layered protection configuration method for urban rail transit power distribution system

目前城市轨道交通中普遍存在配电系统保护层级较多,保护整定配置方法不统一,保护开关越级跳闸、误动作时常发生等问题,从而严重影响了轨道交通的安全可靠运行.针对这一问题,本文提出了配电系统层级保护整定配置方法,该方法利用配电开关的四段保护及层级之间的合理配合有效解决了配电系统中的级差配合和有效保护问题.通过实际案例证明层级保护整定配置方法的有效性.并把保护整定计算方法公式化,有利于该方法运用到其他相关领域.

The urban rail transit system exists some common problems such as redundant protection level of the power distribution system, lack of uniform protection setting method, over-level tripping of the protection switch, etc., which strongly affect the safe and reliable operation of the rail transportation. Aiming at this, this paper proposes a layered protection configuration method for power distribution system. This method uses four-stage protection scheme of the distribution switch and reasonable coordination between layers, and thus achieves good coordination of level difference and effective protection. The effectiveness of the proposed layered protection configuration method is proved by practical examples. And all the formulations of configuration method have been normalized, which is helpful for the application of this method to other related fields.