首页|用于变频电机绕组绝缘监测的双环高频共模电流传感器

用于变频电机绕组绝缘监测的双环高频共模电流传感器

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  • 国家科技期刊平台
  • NETL
  • NSTL
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绝缘失效是导致电力装备故障停机的重要原因。高频共模漏电流法与局部放电法、高频注入法等方法相比，具有非侵扰和灵敏性高的特点，但高频共模电流检测面临高幅值、多频段差模电流的干扰。为此，本文提出一种基于磁屏蔽原理的双环结构电流传感器，内环利用磁聚集效应对差模电流磁场进行隔离，外环基于罗氏线圈原理对高频共模电流信号进行检测。通过分析共模和差模电流的磁场分布，研究了磁环参数与共模电流信噪比的关系，设计了双环传感器的参数。最后，在3千瓦永磁同步电动机进行了实验验证。结果表明，所提出的双环高频共模电流传感器能够有效地抑制高频差模电流的干扰。与单环传感器相比，差模分量减少了约40%，大大提高了在线绝缘监测的精度。
Double-ring high-frequency common-mode switching oscillation current sensor for inverter-fed machine winding insulation monitoring
Insulation failure significantly contributes to the unpredictable shutdown of power equipment.Compared to the partial discharge and high-frequency(HF)injection methods,the HF common-mode(CM)leakage current method offers a non-intrusive and highly sensitive alternative.However,the detection of HF CM currents is susceptible to interference from differential-mode(DM)currents,which exhibit high-amplitude and multifrequency components during normal operation.To address this challenge,this paper proposes a double-ring current sensor based on the principle of magnetic shielding for inverter-fed machine winding insulation monitoring.The inner ring harnesses the magnetic aggregation effect to isolate the DM current magnetic field,whereas the outer ring serves as the magnetic core of the Rogowski current sensor,enabling HF CM current monitoring.First,the magnetic field distributions of the CM and DM currents were analyzed.Then,a correlation between the sensor parameters and signal-to-noise ratio of the target HF CM current was established.Finally,an experimental study was conducted on a 3-kW PMSM for verification.The results indicate that the proposed double-ring HF CM sensor can effectively mitigate DM current interference.Compared to a single-ring sensor,a reduction of approximately 40%in the DM component was achieved,which significantly enhanced the precision of online insulation monitoring.

Magnetic shieldingDouble-ringCommon-mode currentMaxwell simulation

潘凌青、杜习周、雷兴、叶頲、向大为、李豪

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College of Electrical Power Engineering,Shanghai University of Electric Power,Shanghai 200090,P.R.China

State Grid Shanghai Municipal Electric Power Company,Shanghai 200122,P.R.China

College of Electronics and Information Engineering,Tongji University,Shanghai 201804,P.R.China

磁屏蔽 双环结构 共模电流 Maxwell仿真

National Natural Science Foundation of ChinaNatural Science Foundation of ShanghaiShanghai Rising-Star Program

5190711622ZR142540023QA1404000

2024

10.1016/j.gloei.2024.01.010

全球能源互联网(英文)

全球能源互联网(英文)

CSTPCDEI
ISSN：2096-5117
年,卷(期)：2024.7(1)
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