Dielectric response analysis, performed in time domain and frequency domain is one of the interesting methods used for condition assessment of high voltage equipment. In this article, the degradation of epoxy-mica composite insulation which is widely used in rotating machines has been investigated through frequency domain spectroscopy measurements. Artificial ageing of the carefully prepared stator bar insulation sample was performed through simultaneous application of high temperature and electric field in a designated environmental chamber for specific durations. To study the effect of temperature, the measurements were performed at temperatures ranging from 20 to 60°C at different ageing status. Following experimental work, the measurement results were modelled using Havriliak–Negami model and ageing sensitive parameters were extracted. To study the effect of temperature, the measurements were performed at temperatures ranging from 20 to 60°C. The modelled results matched well with the experimental measurements and certain model parameters sensitive to the ageing condition were identified. The numerical relationships between the insulation status of the stator bar and the aforementioned parameters were identified. It was observed that the nature of the numerical relationship remains identical in the investigated temperature range, although the coefficients vary to some extent.

中文翻译：

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通过介电弛豫建模确定旋转机械中环氧云母复合绝缘老化的方法

在时域和频域中执行的介电响应分析是用于高压设备状态评估的有趣方法之一。在本文中，通过频域光谱测量研究了广泛用于旋转机械中的环氧-云母复合绝缘材料的降解。通过在指定的环境室中同时施加高温和电场并持续特定的时间，对精心准备的定子绝缘条样品进行人工老化。为了研究温度的影响，在不同的老化状态下，在20至60°C的温度范围内进行测量。在实验工作之后，使用Havriliak–Negami模型对测量结果进行建模，并提取老化敏感参数。为了研究温度的影响，在20至60°C的温度范围内进行了测量。建模结果与实验结果吻合良好，确定了对老化条件敏感的某些模型参数。确定了定子条的绝缘状态和上述参数之间的数值关系。可以观察到，尽管系数在一定程度上有所变化，但数值关系的性质在所研究的温度范围内仍然相同。确定了定子条的绝缘状态和上述参数之间的数值关系。可以观察到，尽管系数在一定程度上有所变化，但数值关系的性质在所研究的温度范围内仍然相同。确定了定子条的绝缘状态和上述参数之间的数值关系。可以观察到，尽管系数在一定程度上有所变化，但数值关系的性质在所研究的温度范围内仍然相同。