An experiment to evaluate the benefits of processing aged transformer oil

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI:10.1109/ELINSL.2006.1665264

P. M. Mitchinson, I. Hosier, P. Lewin, A. Vaughan, G.C. Chen, P. Jarman

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引用次数: 12

Abstract

The mineral oil/paper insulating medium used in high voltage applications is subject to ageing through electrical, thermal and mechanical stresses. A significant factor in ageing is chemical action through moisture, metal contaminants and oxidation. The stresses change the properties of the paper and oil, which ages the insulation system. Transmission and distribution operators use condition monitoring and maintenance programs in an attempt to prolong the life of the insulation and hence the transmission equipment. Condition monitoring typically involves moisture analysis, dissolved gas analysis and furanic analysis of the oil. Maintenance involves purification of the oil to remove contaminants. Additional monitoring techniques may be used such as infra-red (IR) spectroscopy and dielectric analysis. However, without controlled ageing experiments under laboratory conditions the applicability of condition monitoring particularly for lifetime prediction is questionable. An opportunity arose from the recent scrapping of an aged high voltage transformer to analyze the diagnostic parameters of typical transformer oil aged under service conditions and compare these results with oil aged under control conditions. The aim is to understand the effects of reprocessing and ageing on some physical, chemical and dielectric properties. Some measurable properties of ageing and the benefits of oil maintenance are discussed in this paper

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对处理老化变压器油的效益进行了试验评价

在高压应用中使用的矿物油/纸绝缘介质会因电气、热和机械应力而老化。老化的一个重要因素是水分、金属污染物和氧化的化学作用。应力改变了纸和油的性质，使绝缘系统老化。输配电运营商使用状态监测和维护程序，试图延长绝缘的寿命，从而延长传输设备的寿命。状态监测通常包括油的水分分析、溶解气体分析和呋喃分析。维修包括对油进行净化以去除污染物。附加的监测技术可以使用，如红外光谱和电介质分析。然而，如果没有实验室条件下的控制老化实验，状态监测特别是寿命预测的适用性是值得怀疑的。由于最近报废了一台老化的高压变压器，因此有机会分析在使用条件下典型变压器油老化的诊断参数，并将这些结果与控制条件下的油老化进行比较。目的是了解再加工和老化对某些物理、化学和介电性质的影响。本文讨论了老化的一些可测量特性和油品保养的好处

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Conference Record of the 2006 IEEE International Symposium on Electrical Insulation

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