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Physicochemical characteristics and dynamic charge mapping in thermally aged two-layered polymer considering surface states: experiment and simulation

Physicochemical characteristics and dynamic charge mapping in thermally aged two-layered polymer considering surface states: experiment and simulation
Physicochemical characteristics and dynamic charge mapping in thermally aged two-layered polymer considering surface states: experiment and simulation
Under operational conditions of high electric fields and elevated temperatures, the accumulation of space charges at multilayer insulation interfaces is often considered as an important factor affecting insulation performance. This study experimentally explored the influence of different thermal aging degrees (110 °C for 0, 720, 1600, 2100, and 2900 h) on physicochemical characteristics. The space charge dynamics in two-layered thermally aged PET-PET films were measured using the pulsed electro-acoustic (PEA) method and simulated on the basis of a one-dimensional modified bipolar charge transport model. The parameterization for key parameters involved in the model was analyzed through parameter sensitivity. Results indicated that the molecular structure, crystallinity, and dielectric spectra of the PET films are affected by thermal aging. The thermalization process also has noticeable effect on the surface state characteristics, which are characterized by deeper trap depth and larger trap density. Several experimental phenomena measured by the PEA method were observed on the basis of numerical simulation.
bipolar charge transport, multilayered;, physicochemical, sensitivity analysis, surface states, thermal aging
2073-4360
Jiang, Xiongwei
d116c7df-fa71-4998-8248-c17997f9a0cf
Sima, Wenxia
24215e98-2575-4526-9083-92eb8ba84ce9
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Peng, Qingjun
99196283-5ac8-45de-9e07-866b3a7d3b96
Sun, Potao
c6b84b66-d049-4a3b-b7e3-704475bdf645
Jiang, Xiongwei
d116c7df-fa71-4998-8248-c17997f9a0cf
Sima, Wenxia
24215e98-2575-4526-9083-92eb8ba84ce9
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Peng, Qingjun
99196283-5ac8-45de-9e07-866b3a7d3b96
Sun, Potao
c6b84b66-d049-4a3b-b7e3-704475bdf645

Jiang, Xiongwei, Sima, Wenxia, Chen, Guanghui, Peng, Qingjun and Sun, Potao (2020) Physicochemical characteristics and dynamic charge mapping in thermally aged two-layered polymer considering surface states: experiment and simulation. Polymers, 12 (3), [634]. (doi:10.3390/polym12030634).

Record type: Article

Abstract

Under operational conditions of high electric fields and elevated temperatures, the accumulation of space charges at multilayer insulation interfaces is often considered as an important factor affecting insulation performance. This study experimentally explored the influence of different thermal aging degrees (110 °C for 0, 720, 1600, 2100, and 2900 h) on physicochemical characteristics. The space charge dynamics in two-layered thermally aged PET-PET films were measured using the pulsed electro-acoustic (PEA) method and simulated on the basis of a one-dimensional modified bipolar charge transport model. The parameterization for key parameters involved in the model was analyzed through parameter sensitivity. Results indicated that the molecular structure, crystallinity, and dielectric spectra of the PET films are affected by thermal aging. The thermalization process also has noticeable effect on the surface state characteristics, which are characterized by deeper trap depth and larger trap density. Several experimental phenomena measured by the PEA method were observed on the basis of numerical simulation.

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Accepted/In Press date: 16 February 2020
Published date: 10 March 2020
Keywords: bipolar charge transport, multilayered;, physicochemical, sensitivity analysis, surface states, thermal aging

Identifiers

Local EPrints ID: 438499
URI: http://eprints.soton.ac.uk/id/eprint/438499
ISSN: 2073-4360
PURE UUID: 652208ec-b62c-4719-a596-e4548b57d304

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Date deposited: 11 Mar 2020 17:32
Last modified: 14 Sep 2021 20:12

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