基于无通道保护的配电线路自动化系统现场应用方案

A field scheme of feeder automation system based on non-communication protection

基于无通道保护的配电线路自动化系统仅利用单端信息,不需要通讯,快速、有选择性隔离配电线路故障;集成备用电源自动投入功能,快速恢复非故障区域供电,是一种新型的配电线路自动化系统。本文针对新系统尚未解决的对称故障隔离问题,以及现场应用中与上级变压器保护的配合问题,展开研究,提出满足现场要求的应用方案。所提方案按照与上级变压器保护配合的时间要求灵活分段配置无通道保护;无选择性瞬时切除对称故障,再基于重合闸确认故障区域并恢复非故障区的供电;同时有选择性地快速隔离不对称故障、基于备用电源自动投入快速恢复供电;满足实用化的要求。

Non-communication protection of feeders can quickly and selectively isolate the asymmetrical fault and recover power supply to the sound feeder sections. But how to coordinate with the protection of transformer and to cope with symmetrical fault need to be solved when applied into the field. This paper proposes a field scheme which can meet the requirements of coordinating with the protection of transformer and quickly isolating the symmetrical fault. The scheme presented in the paper configured the non-communciation protection feeders according to the time requirements of the transformer＇s protection, and tripped the symmertical fault instantly and without selectivity based on three phases voltages, and then used the re-closure technology intergrated in the relay to determine the fault sec- tion and to recover the power supply to the healthy feeder sections. The field scheme can achieve isolating the fault in the feeder and recovering the power supply to the load fast without the need of communication channel.