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Multilayers oil and oil-impregnated pressboard electric field simulation based on the space charge

Multilayers oil and oil-impregnated pressboard electric field simulation based on the space charge
Multilayers oil and oil-impregnated pressboard electric field simulation based on the space charge
Space charge build-up has been considered as the major issue to be addressed for the development of HVDC apparatus such as the converter transformer. In reality, the existence of space charge can distort the local electric field, which could lead to the degradation and even breakdown of insulation materials. Therefore, it is vital to investigate factors that can affect space charge formation and dissipation characteristics such as the temperature, moisture, ageing, thickness, multi-layered structure and electric fields. This paper mainly focuses on the effect of multilayers and thickness on space charge behaviour of oil and pressboard insulation system. Space charge was measured using the pulsed electroacoustic technique (PEA) method. The space charge results are quantitatively analysed to establish the relationship between interfacial charge density and different pressboard and oil thickness ratios. A new space charge interpolation methodology is utilized to input space charge into the multilayers oil and pressboard model using COMSOL software. The local electric field of multilayers oil-impregnated pressboard and oil could be simulated, with the emphasis on the electric field after the polarity reversal operation. From space charge results, they indicate that the increased thickness of pressboard could prohibit the interfacial charge increase while the increased oil thickness could facilitate interfacial charge increase. Moreover, from the electric field simulation results, they indicate that there is the electric field gradient caused by the space charge for multilayers oil and oil-impregnated pressboard structure. After the polarity reversal, the maximum electric field of the oil caused by the space charge is higher than electric field calculated based on the Maxwell-Wagner theory. It is reasonable to reduce the current 2 minutes polarity reversal operation time for the practical operation
530-538
Huang, Bo
8213448b-060c-4d70-b898-d00c6ac754a5
Xu, Zhiqiang
797f8b0e-a035-4cf9-ac3f-99098a3fdb50
Hao, Miao
fb7006e0-07c0-46f5-9279-e30a7d3bd614
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Huang, Bo
8213448b-060c-4d70-b898-d00c6ac754a5
Xu, Zhiqiang
797f8b0e-a035-4cf9-ac3f-99098a3fdb50
Hao, Miao
fb7006e0-07c0-46f5-9279-e30a7d3bd614
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Huang, Bo, Xu, Zhiqiang, Hao, Miao and Chen, Guanghui (2019) Multilayers oil and oil-impregnated pressboard electric field simulation based on the space charge. IEEE Transactions on Dielectrics & Electrical Insulation, 26 (2), 530-538. (doi:10.1109/TDEI.2019.007429).

Record type: Article

Abstract

Space charge build-up has been considered as the major issue to be addressed for the development of HVDC apparatus such as the converter transformer. In reality, the existence of space charge can distort the local electric field, which could lead to the degradation and even breakdown of insulation materials. Therefore, it is vital to investigate factors that can affect space charge formation and dissipation characteristics such as the temperature, moisture, ageing, thickness, multi-layered structure and electric fields. This paper mainly focuses on the effect of multilayers and thickness on space charge behaviour of oil and pressboard insulation system. Space charge was measured using the pulsed electroacoustic technique (PEA) method. The space charge results are quantitatively analysed to establish the relationship between interfacial charge density and different pressboard and oil thickness ratios. A new space charge interpolation methodology is utilized to input space charge into the multilayers oil and pressboard model using COMSOL software. The local electric field of multilayers oil-impregnated pressboard and oil could be simulated, with the emphasis on the electric field after the polarity reversal operation. From space charge results, they indicate that the increased thickness of pressboard could prohibit the interfacial charge increase while the increased oil thickness could facilitate interfacial charge increase. Moreover, from the electric field simulation results, they indicate that there is the electric field gradient caused by the space charge for multilayers oil and oil-impregnated pressboard structure. After the polarity reversal, the maximum electric field of the oil caused by the space charge is higher than electric field calculated based on the Maxwell-Wagner theory. It is reasonable to reduce the current 2 minutes polarity reversal operation time for the practical operation

Text
7429 revised version final - Accepted Manuscript
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Accepted/In Press date: 29 December 2018
e-pub ahead of print date: 6 March 2019
Published date: April 2019

Identifiers

Local EPrints ID: 418461
URI: https://eprints.soton.ac.uk/id/eprint/418461
PURE UUID: e9b989d8-483d-4bf8-ae75-16cdf8b75358

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Date deposited: 09 Mar 2018 17:30
Last modified: 19 Jul 2019 17:26

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Contributors

Author: Bo Huang
Author: Zhiqiang Xu
Author: Miao Hao
Author: Guanghui Chen

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