Abstract Winding fault diagnosis and failure prognosis technique has been developed based on d-q model of brushless synchronous generator (BLSG) considering actual winding insulation degradation curve of machine in inter-turn fault, damper bar and field currents for various severities of inter-turn winding faults have been estimated using extended Kalman filter. For validation of damper bar currents, 2 D transient electromagnetic analyses using finite element method have been done, and 2nd harmonic component of damper bar currents for various severities of inter-turn fault in stator windings have been computed by Fourier transformation. The winding insulation degradation curve of machine has been determined by accelerated life test, and used for estimation of remaining useful life of machine under inter-turn fault, assuming a pre-defined failure threshold. Actual and predicted life of the BLSG has been compared. Wireless sensors using rotor telemetry system have been mounted on the rotor of BLSG for experimental validation of field currents under winding faults. The 2nd harmonic of damper bar currents increase with increase in severities of winding faults and do not get affected by diode failures in rotating rectifier, hence this can be used as a robust fault indicator for diagnosis and prognosis of inter-turn winding fault in BLSG.

中文翻译：

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无刷同步发电机绕组故障诊断及故障预测技术

摘要 基于无刷同步发电机 (BLSG) 的 dq 模型开发了绕组故障诊断和故障预测技术，并考虑了匝间故障时电机的实际绕组绝缘退化曲线、阻尼条和各种匝间绕组故障严重程度的励磁电流。使用扩展卡尔曼滤波器估计。为了验证阻尼条电流，使用有限元方法进行了二维瞬态电磁分析，并通过傅立叶变换计算了定子绕组中各种匝间故障严重程度的阻尼条电流的二次谐波分量。通过加速寿命试验确定了电机绕组绝缘退化曲线，用于估计匝间故障下电机的剩余使用寿命，假设一个预定义的故障阈值。已经比较了 BLSG 的实际寿命和预测寿命。使用转子遥测系统的无线传感器已安装在 BLSG 的转子上，用于在绕组故障下对场电流进行实验验证。阻尼条电流的二次谐波随着绕组故障严重程度的增加而增加，并且不受旋转整流器中二极管故障的影响，因此这可以用作BLSG中匝间绕组故障诊断和预测的可靠故障指示器。