CVT对零序(负序)方向保护影响的研究  

Research of CVT′s influence on zero-sequence(negative-sequence) direction protection

作　　者：王辉[1] 何奔腾[1] 李一泉[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《继电器》2006年第9期1-3,12,共4页Relay

摘　　要：通常认为,CVT暂态过程不会引起方向保护的误判。通过仿真计算,发现在零序(负序)电压很小时,零序方向元件和负序方向元件是有可能会出现误判的,这个现象应当引起重视。同时还发现,零序方向元件和负序方向元件不可能同时出现误判的情况。根据这个特征,提出了零序和负序方向保护的改进措施,以提高方向保护的安全性。It is well-known the transients of CVT wont result in the maloperation of direction protection. However, with large amounts of simulation, this paper finds out that when there is little zero-sequence （negative-sequence） voltage, the zero-sequence direction relay or negative-sequence direction relay has the possibility of maloperation which should be paid attention to. Besides, zero-sequence and negative-sequence direction relay wont maloperate at the same time under the same condition. Based on all of the above, a new method on the zero-sequence and negative-sequence direction relay is put forward to improve the security of direction protection.

关 键 词：电容式电压互感器(CVT) 零序(负序)方向保护 安全性 改进措施 

分 类 号：TM771[电气工程—电力系统及自动化]