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基于频域介电谱分析油纸电容式高压套管绝缘状态评估方法研究
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摘要
本文研究频域介电响应规律,为频域介电法在油纸电容式高压套管绝缘状态中的应用提供依据。设计油纸电容式高压套管作为被试品,开展老化试验模拟套管服役状态。获得一系列不同老化周期的套管,测试其频域介电谱曲线。通过对被试套管的电容量(C)、介质损耗因数(tanδ)的频域谱曲线与老化时间以及聚合度的关系的研究,提出了一种油纸电容式高压套管绝缘状态评估的新方法,即基于频域介电谱分析油纸电容式高压套管绝缘状态评估方法。结果表明:(1)套管的电容量频域谱曲线在10-3~1Hz的频域段内能够明显反映其老化状态;(2)电容量的频域谱曲线的积分与老化时间(或聚合度倒数差)存在二次函数多项式关系;(3)在1Hz左右频率下的介质损耗因数能够更好的反映其老化状态。得出结论为频域介电响应法可应用与油纸高压套管绝缘检测与状态评估应用。
The paper is to study the applied regulation of frequency domain dielectric spectroscopy(FDS)in the insulation assessment of oil-paper condenser bushings.To achieve the result,a sample of oil-paper condenser bushings was designed and tested in aging.through the measurement of FDS of different aged samples and the study of relationship between aging and frequency domain curve of capacitance(C)and dielectric loss factor(tanδ),and the relationship between DP and frequency domain curve of C and tanδ,a new method of insulation assessment of oil-Paper condenser bushings was invented.The results:(1)the capacitance frequency domain dielectric characteristic quantity of the oil-paper insulation sample in 10~(-3)~1Hz can reflect the aging status of bushing;(2)There is a secondary polynomial function between aging time and frequency domain curve of capacitance(C)and between DP and frequency domain curve of C;(3)The dielectric loss factor reflects the aging status of bushing only in the 1Hz.Frequency domain dielectric response method can be applied to detection and condition assessment of the HV oil-paper bushings insulation.
引文
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