基于故障分量综合阻抗的变压器保护新原理  

A Fault Component Comprehensive Impedance Based Transformer Protection Principle

作　　者：索南加乐[1] 焦在滨[1] 宋国兵[1] 贠保记 

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]西安西瑞保护控制设备有限责任公司,陕西省西安市710075

出　　处：《中国电机工程学报》2008年第34期94-100,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50677051);国家科技攻关计划(2005BA208C)~~

摘　　要：提出了一种基于故障分量综合阻抗的变压器保护新原理。利用故障分量综合阻抗在内部故障时符号为负,而外部故障、励磁涌流等情况下符号为正的特点,提出了综合阻抗方向元件,快速灵敏的识别内部故障。利用故障分量综合阻抗的幅值在外部故障时数值较大,而其他情况下数值较小的特点,可靠的识别空投于内部故障的情况。该原理不受励磁涌流的影响,EMTDC仿真验证了其可行性。A novel fault component comprehensive impedance based transformer protection principle is proposed in this paper. The fault component comprehensive impedance is excitation impedance when external fault occurs, which magnitude is large and which sign is positive. In situation of internal fault, the fault comprehensive component impedance is the impedances of the transmission lines and equivalent sources of system. Which magnitude is smaller and which sign is negative. In situation of inrush current, the sign of fault component comprehensive impedance is positive and the magnitude is larger than that in internal fault situation. The proposed principle based on fault component comprehensive impedance can detect the internal fault from external fault and inrush current quickly. Simulation results show that it can immunize the maloperation when transformer is energized, and has high sensitivity and reliability.

关 键 词：变压器 继电保护 故障分量综合阻抗 励磁涌流 

分 类 号：TM77[电气工程—电力系统及自动化]