Studies of the condition of insulation in aged power transformers. 1. Insulation condition and remnant life assessments for in-service units

[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials Pub Date : 1991-07-08 DOI:10.1109/ICPADM.1991.172272

D. Allan, C. Jones, B. Sharp

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引用次数: 25

Abstract

The authors describe practical insulation life assessment techniques developed within the Queensland Electricity Commission for the estimation of remaining useful life of its large power transformers. Novel aspects of the technique are: (i) the use of a database of oil test results for statistical analysis of several aging indicators, to derive an 'insulation age' for the transformer; (ii) the extraction of paper samples from in-situ transformers for analysis of their degree of polymerization (DP); and (iii) the application of appropriate life models to typical power transformers to determine remaining life on a probabilistic basis. These analyses are supported by studies on dismantled large power transformers at the Commission's workshop, to determine the DP profile through typical transformers. From this, relationships are estimated between the DP at hot spots in the transformer and that obtained at convenient sampling locations.<>

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老化电力变压器绝缘状况的研究。1. 在役装置的绝缘状况和剩余寿命评定

作者描述了在昆士兰电力委员会内开发的实用绝缘寿命评估技术，用于估计其大型电力变压器的剩余使用寿命。该技术的新方面是:(i)使用油测试结果数据库对几个老化指标进行统计分析，得出变压器的“绝缘年龄”;(ii)从原位变压器中提取纸质样品，以分析其聚合度(DP);(iii)将适当的寿命模型应用于典型电力变压器，以在概率基础上确定剩余寿命。这些分析得到了委员会车间对拆卸的大型电力变压器的研究的支持，以确定典型变压器的DP剖面。由此，估计了变压器热点处的DP与方便采样位置的DP之间的关系。

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[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials

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