电压切换回路的隐患分析  

Hidden trouble analysis of voltage switch circuit

作　　者：宗秀红[1] 王炼[1] 王世祥[1] 

机构地区：[1]广东电网公司深圳供电局,广东深圳518020

出　　处：《电力系统保护与控制》2008年第20期69-71,74,共4页Power System Protection and Control

摘　　要：双母线接线方式下的主变和线路操作箱中都设有电压切换回路。电压切换继电器同时动作将会引起PT二次并列并烧毁PT二次保险,从而使全站保护装置失压的现象;双重故障下,甚至造成全站失压,扩大事故范围的严重后果。针对电压切换回路中存在的这种隐患,本文进行了详细的分析探讨,并提出了一些相应措施,以提高电压切换回路的可靠性以及变电站运行的可靠性。Voltage switch circuits are set in the operation boxes of transformers and transmission lines for duplicate bus scheme. The PT secondary circuit will be paralleled and the PT secondary safety device may be fused while the voltage switch relays operate at one time, which will make the protection devices of the whole transformer substation voltage loss. Furthermore, the whole transformer substation may lose voltage under another fault. For the existing hidden trouble of the voltage switch circuit, the detailed analysis is made in this paper. Also, some corresponding measures are brought forth, which can improve the reliability of voltage switch circuits and the operation of transformer substations.

关 键 词：电压切换 PT并列 反充电 母线失压 

分 类 号：TM774[电气工程—电力系统及自动化]