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首页> 外文期刊>Electrical engineering in Japan >Diagnosis of Stator-Winding-Turn Faults of Induction Motor by Direct Detection of Negative Sequence Currents
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Diagnosis of Stator-Winding-Turn Faults of Induction Motor by Direct Detection of Negative Sequence Currents

机译：直接检测负序电流诊断异步电动机定子绕组旋转故障

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摘要

In an AC motor, the quick detection of an initially small fault is important for preventing any consequent large fault. Various detection approaches have been proposed in previous papers, for example, by the Park vector (PV), AI techniques, wavelet analysis, and negative sequence analysis. This paper proposes a method for diagnosing a stator winding fault in an induction motor by the direct detection of its negative sequence current. Before starting the diagnosis, the asymmetry admittances for the considered fault cases are obtained by analysis or simulation. The amplitude and phase of the positive sequence voltage, V_p, and of the positive sequence current, I_p, are extracted from the voltage PV and current PV, respectively. The amplitude and phase of the negative sequence, I_n, are extracted from the residue. The asymmetry admittance, Y_a, is calculated from In and V_p. When the positive sequence admittance is known, Y_a can also be calculated from Y_p, I_p, and In. These steps are repeated for each sample time and the motor condition is diagnosed according to the variations in the Y_a values. The simulation and experimental results are also shown, and the proposed method is investigated and validated.
机译：在交流电动机中，快速检测最初的小故障对于防止随后发生的大故障很重要。在以前的论文中已经提出了各种检测方法，例如，通过Park向量（PV），AI技术，小波分析和负序列分析。本文提出了一种通过直接检测其负序电流来诊断感应电动机定子绕组故障的方法。在开始诊断之前，通过分析或模拟获得考虑的故障案例的不对称导纳。正序电压V_p的幅度和相位以及正序电流I_p的幅度和相位分别从电压PV和电流PV中提取。从残差中提取负序列I_n的幅度和相位。根据In和V_p计算不对称导纳Y_a。当已知正序列导纳时，也可以根据Y_p，I_p和In来计算Y_a。对于每个采样时间重复这些步骤，并根据Y_a值的变化诊断电动机状况。给出了仿真和实验结果，并对提出的方法进行了研究和验证。

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