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引用次数: 3

摘要

近年来,电力设备的状态评估越来越受到人们的重视。它通常构成维修策略、风险评估和更新或再投资决策的基础。介电测量是对旋转机械发电机杆等电气绝缘系统进行技术诊断的重要工具。除了局部放电和耗散系数测量外,电绝缘系统的介电响应还提供了有关绝缘介质老化过程和状况的进一步信息。在时域上进行了极化和退极化电流的测量和分析,在频域上应用离散傅里叶变换对测试结果进行解释。本文对旋转机械绝缘系统的常规介电测量和PDC分析进行了评述。采用富树脂发电棒和VPI技术,在不同场馆年龄、运行方式和负荷条件下进行了试验。根据实际试验的结果,建立了一个数学模型,与现有的经典并联和串联电阻和电容等效电路模型相对应。
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Condition evaluation of generator bars
The condition evaluation of electric power equipment gained very much importance in the last years. Generally it forms the basis of maintenance strategy, risk evaluation and the decision over renewal or reinvestment. Dielectric measurements are a very important tool for the technical diagnosis of electric insulation systems like generator bars of rotating machines. Beside partial discharge and dissipation factor measurements the dielectric response of the electrical insulation system gives further information about the aging process and the condition of the insulation medium. The measurements and analysis of the polarization and depolarization current (PDC) are done in time domain and for the interpretation of the test results in the frequency domain the discrete Fourier transformation is applied. This paper should give a view to conventional dielectric measurements and the PDC analysis at insulation systems for rotating machines. Generator bars in resin rich and VPI technology were tested in different stadiums of age, mode of operation and load. For the results of the practical tests a mathematical model was found to show the correspondence to the existing models of the classical equivalent circuit of parallel and serial resistances and capacitances.
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