考虑零序互感的纵联零序方向保护改进方法研究  

Probe into Improved Method for Longitudinal Zero-sequence Pilot Protection Considering Zero-sequence Mutual Inductance

作　　者：姜美玲[1] 胡志坚[1] 何龙[1] 李琳[1] 吴家乐[2] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072 [2]二滩水电开发有限责任公司,四川成都610051

出　　处：《陕西电力》2011年第9期23-26,29,共5页Shanxi Electric Power

基　　金：科技部基础研究重点项目(NCSIE2009-318);中央高校基本科研业务费重点资助(20102070102000079)

摘　　要：纵联零序方向保护广泛应用于同塔双回线,但当线路发生不对称接地故障时,互感线路将感应零序电气量,可能引起互感线路纵联零序方向保护的误动。本文分析了同塔双回线独立运行方式下故障点不同时零序互感对互感线路纵联零序方向保护的影响,在此基础上,根据正常运行线路、故障线路、互感线路零序电气量的特点,提出新的纵联零序方向保护方法。利用PSCAD仿真了同塔独立运行的双回线,仿真结果验证了此方法的正确性和有效性。Mutual inductance line＇s longitudinal zero-sequence pilot protection is widely used in double-circuit transmission lines on a same tower. The protection misoperation may appear because of the influence of zero-sequence mutual inductance when an asymmetrical short-circuit fault occurs. This paper analyzes the effects of the zero-sequence mutual inductance on the protection under stand-alone operation mode of double-circuit lines and proposes a new longitudinal zero-sequence pilot protection based on electrical characteristics of zero-sequence vectors. PSCAD simulation results of the double-circuit lines on a same tower prove the correctness and effectiveness of the proposed method.

关 键 词：同塔双回线 独立运行方式 纵联零序方向保护 零序互感 

分 类 号：TM773[电气工程—电力系统及自动化]