摘要
电力变压器是电力系统中十分重要的设备,电弧故障是变压器内部比较严重的电故障,及时检测电弧并将故障变压器切除从而防止油箱破裂、爆炸,对电力系统稳定运行具有重要意义。本文作者设计搭建油中工频大电流平台,基于此平台产生油中工频电弧,利用宽频天线接收电磁脉冲信号,并通过小波变换对油中工频电弧产生的电磁脉冲信号进行了分析,发现油中工频电弧产生的电磁脉冲信号主要集中在电弧电流过零点附近,且该区间内的电磁脉冲信号主要以2.25MHz~3.75MHz为主,最后指出通过电磁脉冲信号特性对油中工频电弧故障进行检测的可能性。
Power transformer is a very important equipment in power system,and the most serious electrical fault inside the transformer is arc fault.Arc faults are relatively serious electrical faults inside transformers.Timely detection of arcs and removal of faulty transformers to prevent oil tank rupture and explosion are of great significance for the stable operation of the power system.This paper designs and sets up a platform,which can generate power-frequency arc in oil.Use the platform to generate arc in oil,receive electromagnetic pulse signals by using broadband antennas,and analyze the electromagnetic pulse signals generated by power-frequency arc in oil through wavelet transform.It is found that the electromagnetic pulse signals generated by power-frequency arc in oil are mainly concentrated at the time arc current is zero.The frequency band of the electromagnetic pulse signal generated in this period is mainly 2.25MHz~3.75MHz.Finally,the possibility of detecting the power frequency arc fault in oil by analyzing the characteristics of electromagnetic pulse signal is pointed out.
作者
罗迅
桂林
贾云飞
汲胜昌
LUO Xun;GUI Lin;JIA Yunfei;JI Shengchang(State Key Laboratory of Electrical Insulation and Power Equipment,Xian Jiaotong University,Xi'an 710049,China)
出处
《变压器》
2025年第12期6-11,共6页
Transformer
基金
国家重点研发计划(2023YFB2407001)
关键词
变压器
油中电弧
电磁脉冲
故障检测
Transformer
Arc in oil
Electromagnetic pulse
Fault detection
