一种改进的纵联零序方向保护方案  

An improved pilot zero-sequence power directional relay scheme

作　　者：薛明军[1,2] 杨黎明 张祥 陈福锋 邹磊[1,2] 陈实 XUE Mingjun;YANG Liming;ZHANG Xiang;CHEN Fufeng(ZOU Lei1,2,CHEN Shi1,2(1.Guodian Nanjing Automation Co.,Ltd.,Nanjing 211100,China;Nanjing SAC Automation Co.,Ltd.,Nanjing 211153,China)

机构地区：[1]国电南京自动化股份有限公司,江苏南京211100 [2]南京国电南自电网自动化有限公司,江苏南京211153

出　　处：《电力系统保护与控制》2020年第14期104-112,共9页Power System Protection and Control

基　　金：国家自然科学基金青年基金项目资助(51507050);电机工程学会青年人才托举工程项目(CSEE-YESS-2017)。

摘　　要：相较于单回线,同塔双回和多回输电线路发生故障时零序特征更为复杂多变,导致传统的纵联零序方向保护误动或拒动频发。首先从灵敏度、弱电强磁和跨线故障三个方面分析了传统纵联零序方向保护的性能,指出其中存在的问题。然后,提出了一套新型的纵联零序方向保护方案:通过零序方向电压补偿算法提升零序方向元件在高阻故障下的灵敏度,通过零序综合方向元件消除零序互感的影响,构造了跨线故障识别逻辑。最后,通过三个现场实例分析,验证了该算法的有效性。Compared with single-circuit transmission lines,the zero-sequence characteristics of double-circuit and multi-circuit transmission lines on the same tower are more complex and changeable,resulting in frequent maloperation of traditional pilot zero-sequence directional protection.First,the performance of traditional zero sequence directional protection is analyzed from three aspects:sensitivity,weak current and strong magnetism and crossline fault,and the existing problems are pointed out.Then,a novel pilot zero-sequence directional protection scheme is proposed.A zero-sequence directional voltage compensation algorithm is used to enhance the sensitivity of zero-sequence directional elements under high resistance faults,and zero-sequence integrated directional elements are used to eliminate the influence of zero-sequence mutual inductance.Thus a cross-line fault identification logic is constructed.Finally,the effectiveness of the proposed algorithm is verified by three field examples.

关 键 词：纵联零序保护 弱电强磁 同杆并架 跨线故障 灵敏度 

分 类 号：TM773[电气工程—电力系统及自动化]