变压器矿物油老化状况与流动带电电荷的关系

2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) Pub Date : 2012-05-24 DOI:10.1109/OPTIM.2012.6231822

M. Vihacencu, A. Ciuriuc, L. Dumitran, P. Notingher

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引用次数: 5

摘要

矿物油的流动带电会产生局部放电，容易造成电力变压器绝缘系统的损坏，使绝缘系统的理化性能恶化。本文研究了矿物油老化条件对流动起电现象的影响。在T = 135℃温度下，用旋转盘系统测量了矿物油样品在不同时间下未老化和热老化的通电电流。为了评价油样的降解情况，测定了复合介电常数分量、损耗因子和电导率分量的值。结果表明:矿物油的老化使其介电性能恶化，有利于流动起电现象的发生，随着老化时间的延长，油压界面处的表面电荷密度增大;

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Correlation between ageing condition and flow electrification charge in transformer mineral oil

The flow electrification of mineral oil produces local electric discharges which may facilitate the damage and worsen the physico-chemical properties of the electrical power transformer insulation systems. This paper presents a study concerning the influence of the mineral oil ageing condition on the flow electrification phenomenon. The flow electrification current has been measured with a spinning disk system on unaged and thermally aged at T = 135°C mineral oil samples, for different time durations. In order to evaluate the degradation condition of the oil samples, the values of the complex permittivity components, loss factor and electric conductivity components were determined. The results have revealed the fact that the ageing of mineral oil worsens its dielectric properties and favors the flow electrification phenomenon, respectively the surface charge density at the oil-pressboard interface increases with the ageing time.

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2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)

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