基于组合模量的行波电流极性比较式方向保护原理  

PRINCIPLE OF COMBINATION MODULUS BASED TRAVELING WAVE CURRENT DIRECTIONAL PROTECTION WITH POLARITY COMPARISON

作　　者：白嘉[1] 徐玉琴[1] 王增平[1] 王兴国[1] 

机构地区：[1]电力系统保护与动态安全监控教育部重点实验室(华北电力大学),河北省保定市071003

出　　处：《电网技术》2005年第13期69-72,共4页Power System Technology

摘　　要：在以往行波电流极性比较式方向保护研究的基础上提出了一种新的保护原理,即采用行波电流的组合模量作为测量量,对其进行小波变换,通过比较线路两侧组合模量小波变换的模极大值极性可判别区内区外故障。成功解决了以往用单一模量构成的行波电流极性比较式方向保护对某些故障失灵的问题,能正确识别区内区外故障,对所有短路故障类型均有较高的灵敏度。理论分析和仿真结果证明基于该原理的保护具有较高的可靠性。Based on the results of former research on travelling wave current directional protection with polarity comparison a new protection principle is proposed. Taking the combination modulus of travelling wave current as the measurand and through comparing the polarities of modulus maxima of combination moduli's wavelet transform at both terminals of transmission line, the fault inside the protection zone can be distinguished from that outside the protection zone by use of the proposed principle. The proposed principle can successfully solve the problem that the travelling wave current directional protection with polarity comparison based on single modulus may be failed for some kind of faults and possesses a higher sensitivity to all kinds of short circuit faults, in addition the fault inside/outside the protection zone can be correctly identified. Theoretical analysis and simulation results prove that the protection based on the proposed principle is more reliable.

关 键 词：小波变换 组合模量 方向保护 极性比较 行波 

分 类 号：TM771[电气工程—电力系统及自动化]