Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan, Iran.
ISA Trans. 2011 Jan;50(1):14-20. doi: 10.1016/j.isatra.2010.10.008. Epub 2010 Nov 12.
The objective of this paper is to propose a new method for the detection of inter-turn short circuits in the stator windings of induction motors. In the previous reported methods, the supply voltage unbalance was the major difficulty, and this was solved mostly based on the sequence component impedance or current which are difficult to implement. Some other methods essentially are included in the offline methods. The proposed method is based on the motor current signature analysis and utilizes three phase current spectra to overcome the mentioned problem. Simulation results indicate that under healthy conditions, the rotor slot harmonics have the same magnitude in three phase currents, while under even 1 turn (0.3%) short circuit condition they differ from each other. Although the magnitude of these harmonics depends on the level of unbalanced voltage, they have the same magnitude in three phases in these conditions. Experiments performed under various load, fault, and supply voltage conditions validate the simulation results and demonstrate the effectiveness of the proposed technique. It is shown that the detection of resistive slight short circuits, without sensitivity to supply voltage unbalance is possible.
本文旨在提出一种新的感应电动机定子绕组匝间短路检测方法。在以往的报道方法中，电源电压不平衡是主要的困难，这主要是基于难以实现的序分量阻抗或电流来解决的。其他一些方法本质上都属于离线方法。所提出的方法基于电机电流特征分析，并利用三相电流频谱来克服上述问题。仿真结果表明，在健康情况下，三相电流中的转子槽谐波具有相同的幅度，而在偶数匝（0.3%）短路情况下，它们彼此不同。尽管这些谐波的幅度取决于不平衡电压的水平，但在这些情况下，它们在三相中的幅度相同。在各种负载、故障和电源电压条件下进行的实验验证了仿真结果，并证明了所提出技术的有效性。结果表明，无需对电源电压不平衡敏感即可检测到电阻性轻微短路。
