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- Title
基于漏电流多频率特征的变频电机主绝缘状态在线 监测方法.
- Authors
张超凡; 牛峰; 孙庆国; 黄少坡; 张健; 李奎; 方攸同
- Abstract
Stator ground-wall (GW) insulation failure will lead to severe short-circuit fault, greatly reducing the reliability of motor operation and even endangering personal safety. To ensure the safe and reliable operation of inverter-fed motor, it is necessary to monitor the GW insulation condition of inverter-fed motor in real time and provide fault warning. Firstly, through the GW insulation degradation equivalent circuit model of inverter-fed motor, the mathematical model of leakage current was established. Secondly, the frequency distribution of voltage and leakage current in inverter-fed motor was studied, and the influence of insulation impedance and degradation position on leakage current fundamental frequency multiplication, switching frequency multiplication and its sideband frequency was analyzed. Then, a monitoring method for GW insulation condition of inverter-fed motor based on multi-frequency characteristics of leakage current was proposed, which can not only assess the degree of insulation degradation, but also accurately identify insulation degradation position. Finally, this method was validated under various operating conditions of inverter-fed motor, and the experimental tests were consistent with the theoretical analysis, which verifies the effectiveness and accuracy of proposed online monitoring method for GW insulation.
- Subjects
STRAY currents; DISTRIBUTION (Probability theory); FAILURE (Psychology); MATHEMATICAL models; STATORS; ELECTRIC inverters; ONLINE monitoring systems
- Publication
Electric Machines & Control / Dianji Yu Kongzhi Xuebao, 2023, Vol 27, Issue 8, p64
- ISSN
1007-449X
- Publication type
Article
- DOI
10.15938/j.emc.2023.08.007