作　　者： (王波）; (夏经德）; (秦瑞敏）; (罗金玉）;

机构地区： 西安工程大学电子信息学院,陕西西安710048

出　　处： 《西安工程大学学报》 2017年第4期509-514,共6页

摘　　要： 针对电流差动保护在区外故障可靠性与区内故障灵敏度上依然存在难以兼顾的问题,给出一种基于纵向阻抗的T型网络应用方案.理论分析表明,该方案在保证检测外部故障可靠性的前提下,对内部故障具有较高的灵敏度,利用纵向阻抗在区外、区内故障时具有不同的故障特征,对故障区间可进行有效辨别,且该方案具有较强的抗电流互感器暂态饱和能力.EMTP仿真结果表明,该方案在区外故障时具有较高的可靠性,区内故障时,具有较强的灵敏度,并且不会受电流互感器暂态饱和的影响使保护发生误动. The problem in the current differential protection is whether the reliability in the external fault is compatible with the sensitivity in the area fault. A T type network application scheme based on the longitudinal impedance is thus put forward. Theoretical analysis shows that in the premise of ensuring the reliability of the external fault, it has the characteristics of high sensitivity of internal fault, and it is effective when making use of the amplitude characteristic of longitudinal impedance to distinguish fault zone. And during the transient saturation of current transformer, the longitudinal impedance has a strong ability to withstand. The EMTP simulation results show that the scheme has high reliability in the external fault, strong sensitivity in the area fault,and will not be affected to misoperate by the transient saturation of current transformer.

关 键 词： 纵向阻抗 电流差动保护 电流互感器饱和