500 kV母线保护技术改造方案应用探讨  

Discussion on Application of Technological Upgrade Scheme to 500 kV Bus Differential Protection

作　　者：叶梦姣 YE Mengjiao(Chongqing Electric Power Company,Chongqing 400039,China)

机构地区：[1]国网重庆市电力公司超高压分公司,重庆400039

出　　处：《电工技术》2024年第1期98-99,104,共3页Electric Engineering

摘　　要：500 kV变电站承担重要供电任务,一般不允许母差保护长时间退出运行。以重庆电网某500 kV变电站500 kV母线保护为实例,介绍了500 kV母线保护装置两种不同的改造技术方案。500 kV母线一次设备停电方式,500 kVⅠ母或Ⅱ母上所有边断路器均停电,两套500 kV母差保护装置同时退出运行进行技术改造;改变电网运行方式与潮流分布,500 kV母线一次设备不停电,结合边断路器轮停,两套500 kV母差保护装置轮停进行技术改造。对两种方案的优缺点及适用性进行了比较。500 kV substations undertake important tasks of electric supply and long-time stoppage of their busbar differential protections are generally unacceptable.Taking the 500 kV busbar protection of an actual 500 kV substation of Chongqing Power Grid as an exemplary case,this paper elaborates two different technological upgrade schemes of the differential protection.One is the upgrade with electric supply interruption,in which circuit breakers on all sides of bus I or II are switched off simultaneously,resulting in stoppage from operation of both two protection device sets to undergo upgrade process.The other is the upgrade without supply interruption implemented by changing grid operation mode and power flow distribution,and by alternately switching off different side circuit breakers,so as to enable one-by-one stoppage and upgrade between the two protection device sets.The paper also compares advantages and disadvantages as well as applicability of each technological upgrade scheme.

关 键 词：一次设备 二次设备 停电 不停电 500 kV母差保护 技术改造 

分 类 号：TM774[电气工程—电力系统及自动化]