基于差流谐波波形特点的判别母差保护中电流互感器饱和的方案  

Distinguishing CT Saturation in Busbar Protection Based on the Characteristic of Differential Current Harmonic Waves

作　　者：郑祥云[1] 周晖[1] 朱启晨[2] 董杰[2] 

机构地区：[1]北京交通大学电气工程学院,北京100044 [2]北京四方利水自动化设备公司,北京100094

出　　处：《电气技术》2006年第10期25-29,共5页Electrical Engineering

摘　　要：电流互感器(CT)饱和时,母线差动保护装置的可靠、安全、稳定运行是衡量母线保护的一项重要指标。文中分析了各种情况下的CT饱和及短路时的差流波形,提出了基于差流谐波波形特点的判别CT饱和的方案。该方法保证了母线差动保护在区外故障CT饱和时可靠闭锁、发生短路故障时快速地开放差动保护。It is very important for busbar protection that when CT saturated , the reliability of busbar protection has influenced the safe and stable operation of electric power system. The paper analyze differential current wave in all the situation include saturation and short fault. On this foundation ,put forward a new method to distinguish CT saturation based on the characteristic of differential current harmonic waves. This method ensure that lockout busbar differential protection reliability when occur external fault and dispark busbar differential protection quickly when occur internal fault.

关 键 词：母差保护 CT饱和 差流谐波 

分 类 号：TM77[电气工程—电力系统及自动化] TM452