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Space charge modulated electrical breakdown

Space charge modulated electrical breakdown
Space charge modulated electrical breakdown
Electrical breakdown is one of the most important physical phenomena in electrical and electronic engineering. Since the early 20th century, many theories and models of electrical breakdown have been proposed, but the origin of one key issue, that the explanation for dc breakdown strength being twice or higher than ac breakdown strength in insulating materials, remains unclear. Here, by employing a bipolar charge transport model, we investigate the space charge dynamics in both dc and ac breakdown processes. We demonstrate the differences in charge accumulations under both dc and ac stresses and estimate the breakdown strength, which is modulated by the electric field distortion induced by space charge. It is concluded that dc breakdown initializes in the bulk whereas ac breakdown initializes in the vicinity of the sample-electrode interface. Compared with dc breakdown, the lower breakdown strength under ac stress and the decreasing breakdown strength with an increase in applied frequency, are both attributed to the electric field distortion induced by space charges located in the vicinity of the electrodes.
1-4
Li, Shengtao
e2d199c9-1c0c-40c8-aefb-ff3b3d8e4799
Zhu, Yuanwei
ffa10088-f1fc-49a2-801e-e9dc803d8cff
Min, Daomin
ab5f57d8-bd91-474d-a86d-b49bc2e713af
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Li, Shengtao
e2d199c9-1c0c-40c8-aefb-ff3b3d8e4799
Zhu, Yuanwei
ffa10088-f1fc-49a2-801e-e9dc803d8cff
Min, Daomin
ab5f57d8-bd91-474d-a86d-b49bc2e713af
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Li, Shengtao, Zhu, Yuanwei, Min, Daomin and Chen, George (2016) Space charge modulated electrical breakdown. Scientific Reports, 6 (32588), 1-4. (doi:10.1038/srep32588).

Record type: Article

Abstract

Electrical breakdown is one of the most important physical phenomena in electrical and electronic engineering. Since the early 20th century, many theories and models of electrical breakdown have been proposed, but the origin of one key issue, that the explanation for dc breakdown strength being twice or higher than ac breakdown strength in insulating materials, remains unclear. Here, by employing a bipolar charge transport model, we investigate the space charge dynamics in both dc and ac breakdown processes. We demonstrate the differences in charge accumulations under both dc and ac stresses and estimate the breakdown strength, which is modulated by the electric field distortion induced by space charge. It is concluded that dc breakdown initializes in the bulk whereas ac breakdown initializes in the vicinity of the sample-electrode interface. Compared with dc breakdown, the lower breakdown strength under ac stress and the decreasing breakdown strength with an increase in applied frequency, are both attributed to the electric field distortion induced by space charges located in the vicinity of the electrodes.

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Accepted/In Press date: 11 August 2016
e-pub ahead of print date: 7 September 2016
Organisations: EEE

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Local EPrints ID: 403036
URI: http://eprints.soton.ac.uk/id/eprint/403036
PURE UUID: 04c4e3d5-4633-4830-ba7c-8361a1225b77

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Date deposited: 22 Nov 2016 15:18
Last modified: 06 Oct 2020 21:17

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Contributors

Author: Shengtao Li
Author: Yuanwei Zhu
Author: Daomin Min
Author: George Chen

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