摘要
从提高数字化变电站保护系统可靠性出发,利用数字化变电站保护系统信息共享、数据传输方便的特点,提出了解决保护装置失效和互感器失效的2种技术方案,即2种保护装置故障的后备措施:共享后备保护单元SBPU(用于解决保护单元失效)和软后备SB(用于解决互感器失效)。SBPU是在某保护单元工作异常或失效时,由保护管理机检测到该单元异常时启动共享备用保护单元,并下载失效对象间隔的保护定值,采集该间隔的数据,自动承担失效单元的保护功能,做到在线不停电的保护功能恢复的技术方案。SB是在某一回路的互感器失效时,可用其他回路的电流来间接获取失效回路的电流的技术方案。OPNET仿真分析了2种方案投切所需要的时间,通过信息流仿真,得到后备可靠性方案的投切时间。结果表明所提2种方案均具有可行性。
To increase the reliability of protection system in digital substation,two backup units SBPU （Shared Back-up Protection Unit） and SB（Software Back-up） are put forward for protection unit failure and transformer invalidation respectively,which are based on the convenient information sharing and data transmission of protection system in digital substation. When the protection manager detects a protection unit abnormal or failed,it starts SBPU and downloads the settings of the failed unit to SBPU,which then assumes the protection functions of the failed unit as online protection unit. When the transformer of a branch is invalid,SB gets indirectly the current with the currents of other branches. The switching time of two backup units are analyzed by information flow simulation with OPNET and results show that two backup units are feasible.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第7期127-129,共3页
Electric Power Automation Equipment
关键词
数字化变电站
可靠性
信息流仿真
投切时间
可行性
digital substation
reliability
information flow simulation
switching time
feasibility
