相控断路器选相关合问题分析及应用研究

Analysis on making operation in phase selection of phase-controlled circuit breaker and its application

选相合闸技术能大大降低断路器合闸操作过程中的暂态过电压和涌流,提高电力设备寿命及电力系统的稳定性,在超、特高压系统中得到了大力发展和应用。伴随着应用增多、挂网运行时间增长,提前预击穿、过电压/涌流增大等选相关合问题时常发生。以相控断路器为研究对象,针对其在选相关合过程中出现的问题,采用理论分析及试验验证方法,结合选相控制技术的基本理论和原理进行了原因分析。实际合闸时间t偏离预期合闸时间T较大是导致相控断路器选相关合问题发生的根本原因。

Phase selection closing technology can greatly reduce transient over-voltage and inrush current in the closing operation of circuit breaker, improve service life of power equipment and stability of power system, which has been rapidly developed and applied in ultra-high and extra-high voltage system. With its increased application and network operation, phase selection problems occurred frequently such as prebreakdown, overvoltage/inrush current. Phase-controlled circuit breaker is taken as the research object, aiming at the problems in the process of phase selection and combination, theoretical analysis and experimental verification methods are adopted. The reasons are analyzed by combining the basic theory and principle of phase selection control technology. It is considered to be the fundamental reason to cause making operation in phase selection of phase-controlled circuit breaker that actual closing time t deviates greatly from expected closing time T.