双回线横联差动保护装置改进后的分析与研究

Analysis and Study on Improved Transverse Differential Protection of Double Line

我国电力系统大用户终端供电类型较多,接线方式具有特殊性,即双回线路较短,保护整定困难很大。而横联差动保护则能克服短线路保护的整定困难。针对横联差动保护在同杆并架回路时会受到零序循环电流的影响而发生不动确动作的问题,文中予以分析,提出了改进方案并进行数字仿真验证。改善这类保护的性能,使其能够满足大用户电力系统运行要求,并能够节省工程造价,具有一定现实意义。

There are many kinds of end user in Chinas power system, which have different special connections e. g. shorter double line and difficulty for protection setting. Transverse differential protection can solve the problem of protection settings for shorter line protection. This paper analyzes the malfunction problem of transverse differential protection for double line on the same tower, which is caused by circulating current of zero sequence. The paper also presents improving scheme and verification of digital simulation. Improved transverse differential protection will decrease the cost of project and have practical significance.