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The mathematical model of dissipation factor with temperature–frequency effect for oil-impregnated paper bushings

机译：油浸纸衬套温度频率效应的耗散因子数学模型

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The accuracy of insulation defect diagnosis based on the dielectric spectrum response is severely influenced by temperature for oil-impregnated paper bushing. The dielectric loss (tan?δ) mathematical model with a temperature–frequency factor to restrict the application of the frequency domain dielectric spectrum (FDS) for insulation diagnosis is not clear. In this paper, five temperatures are selected to study the frequency temperature characteristic of the FDS and polarization current for oil-impregnated paper bushing. The experimental results show that the temperature has different effects on the lower frequency (0.001 Hz–1 Hz) and higher frequency (1000 Hz–10 kHz) of FDS. With the increasing temperature, the lower frequency tan?δ of 1 mHz–1 Hz shows a better pattern of exponential growth, while the higher frequency tan?δ at 1 kHz–10 kHz shows the declining law with the rising temperature. With the increasing temperature, the polarization current shows a better pattern of exponential growth, while resistance obviously shows the declining law of the exponential pattern. The FDS curve of oil-impregnated paper bushings can be amended by the mathematical model of tan?δ for the dielectric response on site for accuracy diagnosis.
机译：基于介电光谱响应的绝缘缺陷诊断的准确性受到油浸纸衬套的温度严重影响。具有温度频率因子的介电损耗（TANΔ）数学模型，以限制频域介电谱（FDS）的应用，但不明确。本文选择了五个温度，以研究油浸纸衬套的FDS和偏振电流的频率温度特性。实验结果表明，温度对较低频率（0.001Hz-1Hz）和较高频率（1000Hz-10kHz）的FDS具有不同的影响。随着温度的增加，1MHz-1 Hz的较低频率褐色Δδ显示出更好的指数增长模式，而1kHz-10kHz的较高频率棕褐色Δδ显示了温度上升的下降规律。随着温度越来越大，偏振电流显示出更好的指数增长模式，而阻力明显显示指数图案的下降规律。油浸纸衬套的FDS曲线可以通过TAN的数学模型进行修改，用于对现场的介电响应进行准确性诊断。

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