基于2种傅氏算法相关性分析的变压器励磁涌流识别方法  

Identification of transformer excitation inrush based on correlation analysis between two Fourier algorithms

作　　者：陈达壮[1] 黄家栋[1] 张玲 

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003 [2]福建省厦门电业局,福建厦门361004

出　　处：《电力自动化设备》2010年第10期71-74,共4页Electric Power Automation Equipment

摘　　要：针对励磁涌流波形畸变严重且会出现尖顶波,而故障电流基本保持基频正弦波特征的特点,提出一种识别变压器励磁涌流的新方法。先通过全波傅氏算法和半波傅氏算法分别求得差动电流的基波虚部,利用相关分析原理求得归一化后的相关系数,设定整定值来判断励磁涌流。通过动模实验对变压器在空载合闸、相间短路、单相接地短路以及带故障空投4种运行状态下获得的数据进行分析,验证了所提方法的正确性和有效性。As the excitation inrush is seriously distorted while the fault current is nearly sinusoid,a method is proposed to identify the excitation inrush current of transformer. Full-wave Fourier algorithm and half-wave Fourier algorithm are used to respectively calculate the imaginary part of fundamental differential current,and the normalized correlation coefficient between them is then deduced by correlation analysis,which is compared with a setting to identify the inrush current. Dynamic tests are carried out for four transformer operating conditions：energizing without load,inter-phase short-circuit,phase-ground short-circuit and energizing with fault. Experimental data are analyzed,which verifies the correctness and effectiveness of the proposed approach.

关 键 词：励磁涌流 全波傅氏算法 半波傅氏算法 基波虚部 相关系数 

分 类 号：TM771[电气工程—电力系统及自动化]