电气系统中谐波对继电器保护的影响  

The Influence of Harmonics in Electrical System on Relay Protection

作　　者：杨光伦 曾乾嵘 Yang Guang-lun;Zeng Qian-rong

机构地区：[1]贵州振华群英电器有限公司,贵州贵阳550018

出　　处：《今日自动化》2021年第9期67-68,共2页Automation Today

摘　　要：现代电力系统中,整流晶闸管、变频设备以及换相逆变装置的大量使用,导致电网谐波污染问题呈现出加重趋势,高次谐波的存在对各类电气设备均造成不同程度的损害。文章以继电器为例,首先概述了谐波对整流型、电磁型以及感应型继电器带来的具体危害;随后介绍了瞬时无功功率法、傅里叶变换法和小波变换法3种常用的谐波检测方法;最后结合工作实践,分别从加装滤波器、改进谐波抑制技术,以及设计消谐回路等总结了可用于抑制谐波、保护继电器的可行性策略,为电力系统的稳定运行提供了支持。In modern power systems,the large-scale use of rectifier thyristors,frequency conversion equipment,and commutation inverter devices has led to an aggravation of the problem of harmonic pollution in the power grid.The existence of high-order harmonics has caused various degrees of damage to various electrical equipment..Taking relays as an example,this article first summarizes the specific harm caused by harmonics to rectifier,electromagnetic,and induction relays;then introduces three common harmonics:instantaneous reactive power method,Fourier transform method,and wavelet transform method.Wave detection method;Finally,combined with work practice,from the aspects of installing filters,improving harmonic suppression technology,and designing harmonic elimination loops,summarized the feasible strategies that can be used to suppress harmonics and protect relays,which are for the stability of the power system.Operational support is provided.

关 键 词：电气系统 谐波 继电器 滤波器 

分 类 号：TM611[电气工程—电力系统及自动化]