电力变压器油纸绝缘状态评估的频域介电特征参量研究

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Abstract

The electrical properties and service life of power transformers are directly affected by the moisture and aging of oil-paper insulation. To investigate the influences of moisture and aging on frequency domain spectroscopy(FDS) for accurately evaluating the moisture content and aging state in transformers, some experimental pressboards with different moisture contents and aging states were firstly prepared, and then the complex capacitance spectroscopy(C^*) was measured. After that, a new method which can assess the moisture content and aging state by using the imaginary part of complex capacitance(C″) was proposed. The frequency domain dielectric characteristics(FDDC) utilized as the evaluation of moisture content and aging state of pressboards were also extracted, and the quantitative relations between FDDC and moisture content & degree of polymerization(DP) were proposed. Finally, the temperature influence on C^* was eliminated by introducing “frequency shift of FDS”. Results show that the FDDC proposed in this paper are very sensitive to moisture content and aging state. The master curve of C^* obtained by “frequency shift of FDS” could eliminate the temperature influence on C^*.

Key words： Power transformer oil-paper insulation condition assessment frequency domain spectroscopy(FDS) frequency domain dielectric characteristics(FDDC)

Received: 06 October 2013 Published: 10 April 2015

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TM85

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	Articles by authors
	Liao Ruijin
	Liu Jiefeng
	Yang Lijun
	Ma Zhiqin
	Gao Fei
	Zhang Yiyi

Cite this article:

Liao Ruijin,Liu Jiefeng,Yang Lijun等. Investigation on Frequency Domain Dielectric Characteristics for Condition Assessment of Transformer Oil-Paper Insulation[J]. Transactions of China Electrotechnical Society, 2015, 30(6): 247-254.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I6/247

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