Decay products in mineral oil: A comparative study between hybrid and conventional insulation systems

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI:10.1109/ICDL.2014.6893161

K. S. Kassi, I. Fofana, F. Megnefhi, A. Betie, Z. Yeo

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引用次数: 5

Abstract

The useful functional life of a power transformer is determined by the life of the paper insulation. Therefore polyaramid based synthetic insulation paper, with better thermal stability emerged for application in transformers. In this research work, the quality of mineral oil aged with hybrid solid insulation is investigated. Comparison was made with traditional mineral oil impregnated cellulose paper to provide base line for comparison. The samples underwent thermal accelerated aging procedure according to ASTM-D1934 standard. The aged samples were furthermore submitted to local overheating. The condition of oil samples collected from each aging vessel was assessed using several diagnostic techniques, namely the dissolved decay products (DDP), the insoluble decay products (Turbidity), the interfacial tension (IFT) and the moisture content. The results indicate that oil aged with hybrid solid insulation depicts less dissolved and insoluble decay products and less polar contaminants at some aging stages especially after the application of a local overheating.

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矿物油中的衰变产物:混合和常规保温系统的比较研究

电力变压器的有效使用寿命是由绝缘纸的寿命决定的。因此，热稳定性较好的聚酰胺基合成绝缘纸出现在变压器中。本文对混合固体绝热老化矿物油的质量进行了研究。与传统的矿物油浸渍纤维素纸进行比较，为比较提供基准。试样按ASTM-D1934标准进行热加速时效处理。老化后的样品进一步出现局部过热。从每个老化容器中收集的油样状况使用几种诊断技术进行评估，即溶解衰变产物(DDP)，不溶性衰变产物(浊度)，界面张力(IFT)和水分含量。结果表明，在某些老化阶段，特别是局部过热处理后，混合固体绝缘老化油的溶解性和不溶性衰变产物较少，极性污染物较少。

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2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)

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