单相断线故障对城市输配电网的影响分析

Analysis on Impact of Single-phase Wire Break on Power Transmission and Distribution Networks in Cities

在介绍目前城市中压输配电网结构以及运行方式的基础上,对并列运行双回线以及线路-变压器组接线的输电线路发生单相断线故障时的系统电压、电流故障特征进行了分析,为快速准确判断故障提供理论依据。最后结合实际事故案例对断线故障的处理方法提出相关建议。

On the basis of introducing present grid configuration and operation mode of medium voltage transmission and distribution networks in cities,the paper analyzes system voltage,characteristics of current faults in the condition of single-phase wire break of line transformer wiring and double-circuit lines in parallel operation,which provides theoretical basis for fast and accurate judgement of faults.Finally,the paper,in combination with accident cases,brings forward suggestions on handling methods for wire break.