城市轨道交通开闭所接线方案优化设计

国内城市地铁大多选择接线简单、易于工程实施的开闭所方案实现主变电所资源共享。分析常规开闭所接线方案存在供电可靠性低、故障影响范围大的缺点。为提高开闭所的供电可靠性,提出一种新型同源双回线的优化接线方案。该方案优点在于当开闭所进线电缆发生故障时,继电保护装置可自动切除故障,不会造成停电。论证了优化接线方案在工程实施中的可行性,最后介绍开闭所的保护配置方案,并提出采用带方向的数字通信电流保护作为开闭所后备保护,以满足继电保护选择性的要求。

Optimum Design of Connection Scheme for Switching Station of Urban Rail Transit

Most domestic metro cities choose a connection scheme for switching substations that is simple and easy to implement in order to realize sharing of the main substation. This paper analyzes the shortcomings of conventional connection schemes, such as low reliability of power supply and a wide range of impacts when faults occur. To improve the power supply reliability of switching stations, a new connection scheme that uses a homologous double-circuit cable is proposed. The advantage of this scheme is that when faults occur in the incoming power cable of the switching station, the relay protection device can automatically remove the fault without causing a power outage. After that, this paper demonstrates the feasibility of the optimized scheme in project implementation. Finally, this paper introduces a protection configuration scheme for the switching station and proposes to adopt directional current protection using digital communication network technology to achieve selectivity of the backup protection.