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Quantitative Analysis Ageing Status of Natural Ester-paper Insulation and Mineral Oil-paper Insulation by Polarization/Depolarization Current

Quantitative Analysis Ageing Status of Natural Ester-paper Insulation and Mineral Oil-paper Insulation by Polarization/Depolarization Current
Quantitative Analysis Ageing Status of Natural Ester-paper Insulation and Mineral Oil-paper Insulation by Polarization/Depolarization Current
Polarization and Depolarization Current (PDC) technique is an effective tool to assess the condition of oil-paper insulation system in power transformers. So far the PDC behaviors of mineral oil-paper insulation have been widely investigated. However, with the increasing number of transformer choosing natural ester as its insulation oil, it is important to investigate the PDC characteristics of natural ester-paper insulation to see whether the PDC technique can also be used to assess the condition of new insulation system using natural ester in transformers accurately. In this research, natural esterpaper insulation sample and mineral oil-paper insulation sample were subjected to thermally accelerated ageing experiment at 110 °C for 120 days. The PDC characteristics of natural ester-paper insulation sample and mineral oil-paper insulation sample were compared over the ageing process. A new method for assessing the ageing condition of the oil-paper insulation in terms of the depolarization charge quantity was proposed. Results show that the polarization/depolarization current of natural ester-paper insulation sample is higher than that of mineral oil-paper insulation sample with the same ageing intervals. The depolarization charge quantity of both kinds of oil-paper insulation sample is very sensitive to their ageing conditions. There is an exponential relation between the stable depolarization charge quantity of both kinds of oil-paper insulation sample and the degree of polymerization (DP) of paper. The depolarization charge quantity can be used to predict the ageing condition of oil-paper insulation providing the measurement temperature is kept the same.
Natural ester, mineral oil, oil-paper insulation, power transformer, polarization/depolarization current, depolarization charge quantity, ageing condition.
1070-9878
188-199
Hao, Jian
01bbfea6-2a3e-40b3-bb0c-1c16d6dcd66d
Liao, Ruijin
e10ba49b-110d-4e1d-a102-b1a4e4a0b7e2
Chen, George
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Ma, Zhiqin
41dd4e48-eedd-406f-89e5-1f0dd2072d81
Yang, Lijun
da9c0071-a555-45cb-b5d6-274fbf2dcc0a
Hao, Jian
01bbfea6-2a3e-40b3-bb0c-1c16d6dcd66d
Liao, Ruijin
e10ba49b-110d-4e1d-a102-b1a4e4a0b7e2
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Ma, Zhiqin
41dd4e48-eedd-406f-89e5-1f0dd2072d81
Yang, Lijun
da9c0071-a555-45cb-b5d6-274fbf2dcc0a

Hao, Jian, Liao, Ruijin, Chen, George, Ma, Zhiqin and Yang, Lijun (2012) Quantitative Analysis Ageing Status of Natural Ester-paper Insulation and Mineral Oil-paper Insulation by Polarization/Depolarization Current. IEEE Transactions on Dielectrics & Electrical Insulation, 19 (1), 188-199.

Record type: Article

Abstract

Polarization and Depolarization Current (PDC) technique is an effective tool to assess the condition of oil-paper insulation system in power transformers. So far the PDC behaviors of mineral oil-paper insulation have been widely investigated. However, with the increasing number of transformer choosing natural ester as its insulation oil, it is important to investigate the PDC characteristics of natural ester-paper insulation to see whether the PDC technique can also be used to assess the condition of new insulation system using natural ester in transformers accurately. In this research, natural esterpaper insulation sample and mineral oil-paper insulation sample were subjected to thermally accelerated ageing experiment at 110 °C for 120 days. The PDC characteristics of natural ester-paper insulation sample and mineral oil-paper insulation sample were compared over the ageing process. A new method for assessing the ageing condition of the oil-paper insulation in terms of the depolarization charge quantity was proposed. Results show that the polarization/depolarization current of natural ester-paper insulation sample is higher than that of mineral oil-paper insulation sample with the same ageing intervals. The depolarization charge quantity of both kinds of oil-paper insulation sample is very sensitive to their ageing conditions. There is an exponential relation between the stable depolarization charge quantity of both kinds of oil-paper insulation sample and the degree of polymerization (DP) of paper. The depolarization charge quantity can be used to predict the ageing condition of oil-paper insulation providing the measurement temperature is kept the same.

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Published date: February 2012
Keywords: Natural ester, mineral oil, oil-paper insulation, power transformer, polarization/depolarization current, depolarization charge quantity, ageing condition.
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 273209
URI: http://eprints.soton.ac.uk/id/eprint/273209
ISSN: 1070-9878
PURE UUID: 0d85f28f-bf66-4ecc-b16d-f1c2e41cddb3

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Date deposited: 14 Feb 2012 11:19
Last modified: 02 Dec 2019 20:59

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Contributors

Author: Jian Hao
Author: Ruijin Liao
Author: George Chen
Author: Zhiqin Ma
Author: Lijun Yang

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