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Temperature gradient effect on the space charge behaviour in multilayers of oil and pressboard

Temperature gradient effect on the space charge behaviour in multilayers of oil and pressboard
Temperature gradient effect on the space charge behaviour in multilayers of oil and pressboard
The presence of space charge within oil and pressboard (PB) can lead to distortion of electric field within converter transformers. Electric field distortion can cause materials to be overstressed which accelerates degradation, and can result in breakdown. Therefore, it is important to analyse the factors that affect space charge formation and dissipation such as temperature, moisture, ageing, multilayers and electric fields. This paper focuses on the temperature gradient and multilayers of oil and PB on space charge. Considering the inhomogeneous acoustic wave velocity caused by a temperature gradient and different dielectric properties of multilayers of materials, an improved space charge recovery algorithm has been developed, in which the distortion of the acoustic wave caused by the attenuation, dispersion, different dielectric properties and temperature effects have been considered. It has been found that for two layers consisting of PB and oil with the bottom electrode fixed at 20 ᵒC, the electric field in the oil increases under the temperature gradient while decreases at ambient temperature. For a three layered sample consisting of PB, oil, and PB with the bottom electrode at ambient temperature, the electric field gradient exists under the temperature gradient and the maximum electric field occurs near the cathode while occurs near the anode at ambient temperature.
1070-9878
1645 - 1653
Zhao, Xuefeng
d5bed945-c871-4aeb-8662-6cb6720299fa
Pu, Lu
cc2640da-f908-4be0-87aa-f995880a202a
Liu, Jian
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Duan, Wei
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Ju, Zeli
9b34a7bd-21d8-446f-a8be-d05c69da8bf0
Sun, Haofei
d67245e2-4acd-4ffa-bcba-5ff9d0d4ae9e
Huang, Bo
8213448b-060c-4d70-b898-d00c6ac754a5
Hao, Miao
181e8cd2-9050-412f-8234-6aa0ecec23f2
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Feng, Nanzhan
dfa98ac0-ca93-4c8f-ae39-51c74ec00d58
Zhao, Xuefeng
d5bed945-c871-4aeb-8662-6cb6720299fa
Pu, Lu
cc2640da-f908-4be0-87aa-f995880a202a
Liu, Jian
03c42a59-6f39-4069-a4b0-464958554e96
Duan, Wei
320e93a0-a89e-4f11-8e89-4b69ec882eec
Ju, Zeli
9b34a7bd-21d8-446f-a8be-d05c69da8bf0
Sun, Haofei
d67245e2-4acd-4ffa-bcba-5ff9d0d4ae9e
Huang, Bo
8213448b-060c-4d70-b898-d00c6ac754a5
Hao, Miao
181e8cd2-9050-412f-8234-6aa0ecec23f2
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Feng, Nanzhan
dfa98ac0-ca93-4c8f-ae39-51c74ec00d58

Zhao, Xuefeng, Pu, Lu, Liu, Jian, Duan, Wei, Ju, Zeli, Sun, Haofei, Huang, Bo, Hao, Miao, Chen, George and Feng, Nanzhan (2019) Temperature gradient effect on the space charge behaviour in multilayers of oil and pressboard. IEEE Transactions on Dielectrics & Electrical Insulation, 26 (5), 1645 - 1653. (doi:10.1109/TDEI.2019.008216).

Record type: Article

Abstract

The presence of space charge within oil and pressboard (PB) can lead to distortion of electric field within converter transformers. Electric field distortion can cause materials to be overstressed which accelerates degradation, and can result in breakdown. Therefore, it is important to analyse the factors that affect space charge formation and dissipation such as temperature, moisture, ageing, multilayers and electric fields. This paper focuses on the temperature gradient and multilayers of oil and PB on space charge. Considering the inhomogeneous acoustic wave velocity caused by a temperature gradient and different dielectric properties of multilayers of materials, an improved space charge recovery algorithm has been developed, in which the distortion of the acoustic wave caused by the attenuation, dispersion, different dielectric properties and temperature effects have been considered. It has been found that for two layers consisting of PB and oil with the bottom electrode fixed at 20 ᵒC, the electric field in the oil increases under the temperature gradient while decreases at ambient temperature. For a three layered sample consisting of PB, oil, and PB with the bottom electrode at ambient temperature, the electric field gradient exists under the temperature gradient and the maximum electric field occurs near the cathode while occurs near the anode at ambient temperature.

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Accepted/In Press date: 3 June 2019
e-pub ahead of print date: 3 October 2019
Published date: October 2019

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Local EPrints ID: 436255
URI: http://eprints.soton.ac.uk/id/eprint/436255
ISSN: 1070-9878
PURE UUID: a9dec3a7-c93c-4ccf-8f29-c2e9ef3ef645

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Date deposited: 04 Dec 2019 17:30
Last modified: 14 May 2020 16:38

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Contributors

Author: Xuefeng Zhao
Author: Lu Pu
Author: Jian Liu
Author: Wei Duan
Author: Zeli Ju
Author: Haofei Sun
Author: Bo Huang
Author: Miao Hao
Author: George Chen
Author: Nanzhan Feng

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