变压器保护中的数字滤波器设计  

Design of Digital Filter in Transformer Protection

作　　者：陈培育[1] 李树青[1] 王瑶[1] 

机构地区：[1]天津市电力公司电力科学研究院,天津300384

出　　处：《电气技术》2013年第12期94-96,共3页Electrical Engineering

摘　　要：在变压器保护中,广泛采用了具有比率制动和二次谐波制动的差动保护,本文研究了这种保护方式的优缺点,分析了全零点数字滤波器的特点,考察了其幅频特性,设计出全零点滤波器。仿真结果表明,此种设计能够较为精确的提取基波和二次谐波分量,能够更加精确的确定制动比,提高了变压器保护的正确动作能力。Differential protection based on percentage check and second harmonic restraint is extensively adopted in transformer protection. In this paper, the merits and shortcomings of this protection are studied, the characteristics of various digital filter methods are analyzed .By comparing the calculation methods of second harmonic restraint, the synthesize method is adopted and the digital filter is designed by the pole and zero estimation method. The simulation suggests that the basic current and second harmonic can be obtained exactly. The percentage check can be more exactly used. It is helpful to avoid the postpone mistake act when the transformer is energized without load for the potential fault.

关 键 词：励磁涌流 比率制动 二次谐波制动 幅频响应特性 全零点滤波器 

分 类 号：TM407[电气工程—电器] TN713.7[电子电信—电路与系统]