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Space charge modulated electrical breakdown of oil impregnated paper insulation subjected to AC-DC combined voltages

Space charge modulated electrical breakdown of oil impregnated paper insulation subjected to AC-DC combined voltages
Space charge modulated electrical breakdown of oil impregnated paper insulation subjected to AC-DC combined voltages
Based on the existing acknowledgement that space charge modulates AC and DC breakdown of insulating materials, this investigation promotes the related investigation into the situations of more complex electrical stress, i.e., AC-DC combined voltages. Experimentally, the AC-DC breakdown characteristics of oil impregnated paper insulation were systematically investigated. The effects of
pre-applied voltage waveform, AC component ratio, and sample thickness on AC-DC breakdown characteristics were analyzed. After that, based on an improved bipolar charge transport model, the space charge profiles and the space charge induced electric field distortion during AC-DC breakdown
were numerically simulated to explain the differences in breakdown characteristics between the pre-applied AC and pre-applied DC methods under AC-DC combined voltages. It is concluded that large amounts of homo-charges are accumulated during AC-DC breakdown, which results in significantly distorted inner electric field, leading to variations of breakdown characteristics of oil impregnated paper insulation. Therefore, space charges under AC-DC combined voltages must be considered in the design of converter transformers. In addition, this investigation could provide supporting breakdown data for insulation design of converter transformers and could promote better understanding on the breakdown mechanism of insulating materials subjected to AC-DC combined voltages.
oil impregnated paper insulation, breakdown, Space Charge, combined voltage
1996-1073
1547
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zhu, Yuanwei
ffa10088-f1fc-49a2-801e-e9dc803d8cff
Li, Shengtao
e2d199c9-1c0c-40c8-aefb-ff3b3d8e4799
Min, Daomin
ab5f57d8-bd91-474d-a86d-b49bc2e713af
Li, Shujun
b7414de5-a11f-48fb-9737-f3462c8ed141
Cui, Huize
72ecb764-ab60-46e1-be4f-3e2866bc9f20
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zhu, Yuanwei
ffa10088-f1fc-49a2-801e-e9dc803d8cff
Li, Shengtao
e2d199c9-1c0c-40c8-aefb-ff3b3d8e4799
Min, Daomin
ab5f57d8-bd91-474d-a86d-b49bc2e713af
Li, Shujun
b7414de5-a11f-48fb-9737-f3462c8ed141
Cui, Huize
72ecb764-ab60-46e1-be4f-3e2866bc9f20

Chen, Guanghui, Zhu, Yuanwei, Li, Shengtao, Min, Daomin, Li, Shujun and Cui, Huize (2018) Space charge modulated electrical breakdown of oil impregnated paper insulation subjected to AC-DC combined voltages. Energies, 11, 1547. (doi:10.3390/en11061547).

Record type: Article

Abstract

Based on the existing acknowledgement that space charge modulates AC and DC breakdown of insulating materials, this investigation promotes the related investigation into the situations of more complex electrical stress, i.e., AC-DC combined voltages. Experimentally, the AC-DC breakdown characteristics of oil impregnated paper insulation were systematically investigated. The effects of
pre-applied voltage waveform, AC component ratio, and sample thickness on AC-DC breakdown characteristics were analyzed. After that, based on an improved bipolar charge transport model, the space charge profiles and the space charge induced electric field distortion during AC-DC breakdown
were numerically simulated to explain the differences in breakdown characteristics between the pre-applied AC and pre-applied DC methods under AC-DC combined voltages. It is concluded that large amounts of homo-charges are accumulated during AC-DC breakdown, which results in significantly distorted inner electric field, leading to variations of breakdown characteristics of oil impregnated paper insulation. Therefore, space charges under AC-DC combined voltages must be considered in the design of converter transformers. In addition, this investigation could provide supporting breakdown data for insulation design of converter transformers and could promote better understanding on the breakdown mechanism of insulating materials subjected to AC-DC combined voltages.

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More information

Accepted/In Press date: 31 May 2018
e-pub ahead of print date: 13 June 2018
Published date: 13 June 2018
Keywords: oil impregnated paper insulation, breakdown, Space Charge, combined voltage

Identifiers

Local EPrints ID: 421514
URI: http://eprints.soton.ac.uk/id/eprint/421514
ISSN: 1996-1073
PURE UUID: 2e8fdbe8-4211-4e18-9d73-a679dfe2a7f8

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Date deposited: 14 Jun 2018 16:30
Last modified: 14 Sep 2021 16:59

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