采集异常、广义求差法及其在母差保护中的应用  

Acquisition abnormity, generalized differentiation method and its application in busbar differential protection

作　　者：万利[1] 

机构地区：[1]吉林省电力有限公司培训中心,吉林长春130022

出　　处：《继电器》2007年第8期12-15,26,共5页Relay

摘　　要：该文称在母差保护的动作特性分析中,相对传统分析方法而言,保护装置采集一次电流的范围和过程中出现的异常为“采集异常”。由于在传统分析方法中没有找到对其定量的分析方法,因而提出了广义求差法并进行论证。该方法可以一次同时求取复杂情况下多个未知量,并包含一二次全部信息,是对传统分析方法的扩展。基于该方法,以66 kV双母线固定联结方式的母线为例分析了出现单一不对应支线并保护区短路时母差保护的动作特性。得到无选择性同时跳开两组母线、保护拒动并由后备保护越级跳闸、有选择性跳闸三个结论,也演示了该方法的计算过程。基于该方法,对CT反接、电流变比异常进行了分析。In the acting characteristic analysis of the busbar differential protection, this paper, compared with, the traditional analytical method, defines the ＂Acquisition Abnormity,＇ as the abnormity within the range and during the process that the protection equipment gathers the current once. This paper provides a generalized differentiation method to solve this problem and proves its effecticeness in detail since there is no traditional corresponding quantitative analytical method. This method can acquire multiple unknowns at one,time under complicated situations, which will include the full information of primary and secondary equations as an extension of the traditional analytical method. Based on this method, this paper uses 66kV dual busbar with fixed connection as an example to analyze basbar protective performance when single asymmetrical lateral and internal short circuit in the protective section happen. Three conclusions have been drawn, which are disconnection of dual busbar simultaneously without selection, failure to operation of protection and backup protection with skip tripping, and selective tripping. The computation process has been demonstrated. Based on this method, analysis has been performed to CT inverse connection and abnormal current ratio.

关 键 词：采集异常 广义求差法 欠采集支线特性 不对应支线 CT异常 

分 类 号：TM773[电气工程—电力系统及自动化]