数字化母线保护失步情况下电流方向元件的应用  

The Application of the Current Direction Module for Digital Busbar Protection in the Asynchronism Sample System

作　　者：宁国丽[1] 余锐[2] 宋小舟[2] 

机构地区：[1]天津市电力公司城南供电分公司,天津300201 [2]北京四方继保自动化股份有限公司,北京100085

出　　处：《电气技术》2010年第10期43-46,共4页Electrical Engineering

摘　　要：数字化母线保护需获取全站的数字化模拟量,如果还采用传统的采样值差动原理,必须保证采样系统同步性能的稳定性,否则母线保护将无法保证其可靠性。本文面向电站系统模拟量采样系统失步的情况下,根据数字化变电站采样系统及GOOSE系统特征提出新的数字式母线保护比相原理:通过比较母线短路电流突变量方向和故障电流分量方向的特征很好解决母线外部短路的不平衡电流对母线保护的影响,对区内故障能快速识别,也能可靠判出转换型故障。确保母线不会在系统失步的情况下丢失保护。The Digital busbar protection joins all the analog value of transformer substation.It must insure the stability of sampling system synchronization if the traditional Sample-Differential theory is still used.The paper presents the principle of direction comparison of the fault-current of busbar in case of the station sample-system being asynchronous.By comparing the direction characteristics of the short circuit abrupt current and the fault component current,it can solve the influence of imbalance current of external short circuit of busbar.And it can judge the fault of internal short circuit quickly and conversion fault reliably.It insures that the busbar has protection even if the sample system is in asynchronous.

关 键 词：数字化母线保护 突变量方向 故障分量 

分 类 号：TM773[电气工程—电力系统及自动化]