反应全类型故障的改进零序方向元件  

An improved zero-sequence directional component to response all kinds of fault

作　　者：申志成 张慧媛[1] 龚仁敏 周庆捷 

机构地区：[1]华北电力大学 [2]北京市中恒博瑞数字电力科技有限公司

出　　处：《电力系统保护与控制》2015年第20期102-106,共5页Power System Protection and Control

摘　　要：纵联零序方向保护已成功应用于特高压输电线路的继电保护中。零序方向元件作为纵联零序方向保护的核心器件,其基本原理决定了其只能反应接地故障而不能反应相间故障和对称故障,针对这一问题提出了改进方法。改进的零序方向元件是利用数据窗的延迟和三选二的逻辑配合来实现对相间故障和对称故障的正确判断。改进后的零序方向元件,不仅能正确反应接地故障,而且对于三相故障和相间故障也可以很好地反应。理论分析和大量仿真对改进的零序方向元件的工作正确性进行了验证,证明了其可以在特高压输电线路上很好地应用,满足特高压交流输电继电保护的要求。Pilot zero-sequence directional protection has been applied successfully to the relay protection in UHV transmission line. The basic principle of zero-sequence directional element determines that it can only react to the grounding fault but can＇t react phase to phase fault and symmetrical fault, this paper takes out a way to solve this question. Zero-sequence directional element improvement is that using the data window delay and logic choice together to give the correct judgment of the phase to phase fault and symmetrical fault. The improved zero-sequence directional element not only can correctly reflect the grounding fault, but also can take a very good reaction for the three phase fault and phase to phase fault. And a lot of theoretical analysis and simulation on the improved zero-sequence direction element proved that it can work correctly and its application in UHV transmission lines is very good.

关 键 词：继电保护 零序方向 相间故障 三相对称故障 特高压输电线路 

分 类 号：TM773[电气工程—电力系统及自动化]