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Research on the feature extraction of DC space charge behavior of oil-paper insulation

Research on the feature extraction of DC space charge behavior of oil-paper insulation
Research on the feature extraction of DC space charge behavior of oil-paper insulation
As the ultra high DC voltage grid comes into an important stage in the ‘Twelfth Five-year Plan’ of China, the requirement on the operation safety of power equipment needs to be improved. Oil-paper insulation plays a significant role as the main insulation material of many key power equipments. The space charge behaviors of oil-paper insulation not only affect the dielectric strength, but also relate to the stability and security of power transmission facilities. Until now, the research on the space charge behaviors of oil-paper insulation remains on the stage of objective description and phenomenon explanation, thus it is very urgent to make some feature extractions on the test results in order to further investigate the DC space charge behaviors of oil-paper insulation. In this paper, based on the large numbers of test data in the first stage, data mining and feature extractions were performed on the DC space charge behavior of oil-paper insulation. The variation laws of some key characteristic parameters obtained in different experiment conditions such as the total charge injection amount, apparent charge mobility, and trap energy distribution were analyzed. In addition, the distribution of trapping level inside oil-paper was calculated by using the PEA test results based on the mechanism of the isothermal decay current, which realized the approximate calculation of trap depth by charge decay characteristics. What’s more, the exponential injection and decay equations of DC space charge changing with time were acquired for the first time, and the physical meanings of related parameters were defined. This has laid a foundation for the prediction and simulation of space charge in the oil-paper insulation.
oil-paper insulation, space charge, DC, feature extraction, DC transformer
1674-7321
1515-1324
Tang, Chao
dcd2c9bd-9fa4-4b23-bb5b-b0295aaba4cf
Liao, Ruijin
e10ba49b-110d-4e1d-a102-b1a4e4a0b7e2
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Yang, Lijun
da9c0071-a555-45cb-b5d6-274fbf2dcc0a
Tang, Chao
dcd2c9bd-9fa4-4b23-bb5b-b0295aaba4cf
Liao, Ruijin
e10ba49b-110d-4e1d-a102-b1a4e4a0b7e2
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Yang, Lijun
da9c0071-a555-45cb-b5d6-274fbf2dcc0a

Tang, Chao, Liao, Ruijin, Chen, George and Yang, Lijun (2011) Research on the feature extraction of DC space charge behavior of oil-paper insulation. Science China Technological Sciences, 54 (5), 1515-1324.

Record type: Article

Abstract

As the ultra high DC voltage grid comes into an important stage in the ‘Twelfth Five-year Plan’ of China, the requirement on the operation safety of power equipment needs to be improved. Oil-paper insulation plays a significant role as the main insulation material of many key power equipments. The space charge behaviors of oil-paper insulation not only affect the dielectric strength, but also relate to the stability and security of power transmission facilities. Until now, the research on the space charge behaviors of oil-paper insulation remains on the stage of objective description and phenomenon explanation, thus it is very urgent to make some feature extractions on the test results in order to further investigate the DC space charge behaviors of oil-paper insulation. In this paper, based on the large numbers of test data in the first stage, data mining and feature extractions were performed on the DC space charge behavior of oil-paper insulation. The variation laws of some key characteristic parameters obtained in different experiment conditions such as the total charge injection amount, apparent charge mobility, and trap energy distribution were analyzed. In addition, the distribution of trapping level inside oil-paper was calculated by using the PEA test results based on the mechanism of the isothermal decay current, which realized the approximate calculation of trap depth by charge decay characteristics. What’s more, the exponential injection and decay equations of DC space charge changing with time were acquired for the first time, and the physical meanings of related parameters were defined. This has laid a foundation for the prediction and simulation of space charge in the oil-paper insulation.

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More information

Published date: May 2011
Keywords: oil-paper insulation, space charge, DC, feature extraction, DC transformer
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 272225
URI: http://eprints.soton.ac.uk/id/eprint/272225
ISSN: 1674-7321
PURE UUID: ebe161d4-cff6-4181-867e-15ff8a9458ec

Catalogue record

Date deposited: 26 Apr 2011 08:18
Last modified: 02 Dec 2019 21:00

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