适用于配电线路无通道保护的重合闸方案

Auto-reclosing adaptive to distribution line non-communication protection

重合闸是提高电力系统供电可靠性的有效手段之一。配电线路无通道保护的时间整定与重合闸的时间整定配合困难,因此配电线路一系列无通道保护都没有使用重合闸功能,这会造成部分负荷停电时间过长。该文提出一种适用于配电线路无通道保护的重合闸方案。负荷侧断路器跳闸后闭锁重合闸功能,其下游负荷由备用电源自动投入装置动作环网开关合闸后恢复供电;电源侧断路器进行三相一次重合闸,瞬时性故障后可重合成功。该方案在瞬时性故障后能恢复对所有负荷供电,缩短了用户的停电时间。EMTP(electro-magnetic transient program)仿真验证了该方案的有效性。

Auto reclosing is an effective method to improve power system reliability. However, the distribution line non-communication protection cannot be easily coordinated with the auto-reelosing, so auto reclosing has never been applied to series of distribution line non-communication protection systems sitace bad timing may induce long power failures for some loads. This paper presents an auto-reclosing scheme that adapts to the distribution line non-communication protection. Auto-reclosing is not effective in the load side circuit breaker because this would hinder downstream loads from regaining their power supply after the reserve power source automatically reconnects, so auto-reclosing is applied in the source side circuit breaker. This scheme can restore the power supply to all loads after a temperary fault and minimize the power failure time. The electro-magnetic transient program （EMTP） simulations show the effectiveness of the scheme.