刀闸位置异常对母线保护的影响及解决方案探讨

Analysis on the Influence of Switch Position Abnormity to Bus Protection and Its Solution Discussion

[目的]双母线接线倒闸操作过程中,由于刀闸主触头起弧以及刀闸主触头行程与辅助接点行程的不完全一致会导致刀闸辅助接点导通状态与刀闸主触头导通状态不完全一致,即刀闸位置异常,它会引起母线保护对母线运行方式的误判从而影响母线保护的逻辑判断和动作出口结果。[方法]文章归纳和分析了倒闸操作期间的4种刀闸位置异常情况及其对母线保护的影响。[结果]研究表明:解决方案提出的与刀闸主触头起弧状态一致的新型刀闸辅助接点,能更好地满足母线保护对刀闸位置状态的相关要求。[结论]对提高母线保护在倒闸操作期间的动作选择性提供一个新的解决思路。

[Introduction]During the double bus operation in substation,the conduction status of main and auxiliary switch contact are inconsistent,due to the main contact arc and the inconsistency of main and auxiliary contact stroke,which is named switch position abnormity.The bus protection can not judge the operation mode of bus bar and make incorrect action finally.[Method]In this paper,four kinds of position abnormity of switch and its influence to bus protection were summaried.[Result]The results show that a new auxiliary contact which is consistent to the arc status of main contact is putted forward preliminary.[Conclusion]This work provides some guidance for improving the selectivity of bus protection.