【摘要】 继电保护系统的隐藏故障对电网的运行威胁很大,而隐藏故障的在线诊断十分困难。文中提出利用广域测量系统(WAMS)的测量计算值与继电保护装置的测量计算结果二者的差异,对继电保护装置静态特性进行实时监测,从而发现其隐藏故障,并建立了相应的判据。以输电线路光纤纵差保护为例,分析了隐藏故障判据门槛值的整定计算方法。更多还原

【Abstract】 Hidden failures in protection system are great threats to the operation of power grids,while there are almost no on-line diagnostic methods for hidden failures so far.To solve this problem,this paper proposes a new method for exploring the hidden failures in protection system.By comparing the calculated values from measurements of wide-area measurement system(WAMS) and from relay protection,this method realizes the real-time monitoring of static characteristics and diagnosis of hidden failures in protection system.The criterion for failure diagnosis is also developed.As an example,for an optical-fiber longitudinal differential protection of transmission lines,the setting method for hidden failure criterion’s threshold is analyzed.更多还原