摘要
电子式互感器是智能电网的重要设备,为了满足电网的供电可靠性,电子式互感器正常运行时的年失效率必须控制在0.2%以下。电力互感器的年失效率一般只有0.01%,二次继电保护装置可以通过冗余设计把综合可靠性提高到99.8%以上。电子式互感器由于一次设备失效相关性的限制,其可靠性难以达到99.8%水平,限制了其在数字化变电站的使用。非传统互感器是一种经济合理的设计,由非传统互感器输出模拟小信号馈送到继电保护单元,其可靠性满足99.8%的要求,模拟输出送到互感器合并单元转换为数字信号进入数据总线,供变电站的监控系统使用,可靠性只需99%。从而使得非传统互感器的模拟输出和合并单元的输出能分别满足数字化变电站继电保护可靠性与监控系统信息化的要求。
Electronic mutual inductor is an important facility in smart grid.The annual failure rate must be controlled below 0.2% to meet the power supply reliability.Usually the annual failure rate of electronic mutual inductor is only 0.01%.The comprehensive reliability could be improved to over 99.8% by second relay protection devices through redundant design.Restricted by the primary failure,the reliability of electronic mutual inductor is difficult to reach 99.8% and above,which restricts its application in digital substation.Non-traditional mutual inductor is a reasonable and economical design.Small simulated signal output from the non-traditional mutual inductor is fed to relay protection unit,in which the reliability could meet the requirement of 99.8%.The simulated signals are outputed to mutual inductor merging unit,and enter into data bus for substation monitoring system after transformed into into digital signals,in which the reliability only requires 99%.The non-traditional simulation output and merging unit output could correspondingly meet the requirements of the digital substation relay protection reliability and monitoring system.
出处
《吉林电力》
2010年第4期1-4,共4页
Jilin Electric Power
