单通道条件下纵差和纵联保护无缝切换机制  

Seamless Handover Between Longitudinal Differential Protection and Pilot Protection in Circumstance of Single Channel

作　　者：吴通华[1] 郑玉平[1] 张哲[1] 窦乘国[1] 

机构地区：[1]国网电力科学研究院/南京南瑞集团公司,江苏省南京市210003

出　　处：《电力系统自动化》2011年第17期72-75,共4页Automation of Electric Power Systems

基　　金：国家电网公司科技项目(SG10002)~~

摘　　要：光纤通道的误码率和通道双向延时一致性是影响纵差保护性能的重要因素。提出利用线路集中参数模型计算电压相角差以识别通道双向延时一致性的方法。在单通道条件下,提出纵联短帧结合纵差长帧传送,并根据通道状况自动实现纵差和纵联保护无缝切换机制。试验表明该机制大大减少主保护退出时间,提高了保护的可靠性。The error code ratio and the coherence of bi-directional channel time-delay of fiber channel are two important factors influencing performances of longitudinal differential protection.A method for recognizing the coherence of bi-directional channel time-delay by using difference between voltage phase angles calculated with line lumped-parameter model is proposed.In circumstance of single channel,two transmission rules,i.e.short frame fit for pilot protection and long frame fit for longitudinal differential protection,are combined,so that the seamless handover between the two kinds of protections can be automatically implemented according to the channel＇s circumstance.The tests show that the seamless handover scheme can significantly reduce the exiting time of main protection,thus improve the reliability of protection.

关 键 词：光纤通道 纵差保护 纵联保护 误码率 通道延时 无缝切换 

分 类 号：TM773[电气工程—电力系统及自动化]