220kV断路器换型改进设计分析

Analysis on Replacing and Improving Design of the 220 kV Breaker

针对220 kV少油断路器因老化等原因急需换型改进的现状,全面地分析了SF6断路器更换少油断路器的设备选型、方案设计以及注意事项;对跳合闸闭锁回路、防跳回路、信号回路、主变控制回路等保护和控制回路提出了采用原继电器和新断路器相关回路等多种备选方案,经方案对比分析,最终推荐了采用新断路器相关回路的方案,并给出保护和控制回路的设计原理图。利用该方案对某变电站220 kV断路器进行了换型改进,改进后设备运行状况良好。

220 kV oil breaker needs to be replaced and improved because of aging and other reasons.The paper analyzes equipment choose,scheme design and noticing of SF6 breaker replacing oil breaker roundly.Several standby designs that adopt former relay or new breaker related circuits are advanced for protect and control circuit such as sub-closing locking circuit,trip-proof circuit,signal circuit,main transformer control circuit and so on.After the contrast analysis,the scheme adopts new breaker related circuits is recommended and schematic of protect and control circuit is present.The design has implemented on a substation.After the improvement,the equipment operates well.