Influence of Thermal Aging on Space Charge Accumulation and Dissipation of Cross-Linked Polyethylene With Different Cross-Linking Agent Contents

This article presents the influence of thermal aging on space charge accumulation and dissipation of cross-linked polyethylene (XLPE) with different cross-linking agent contents. In this article, dicumyl peroxide (DCP) and low-density polyethylene (LDPE) respectively are used as cross-linking agent...

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Bibliographic Details
Published in:IEEE access 2020, Vol.8, p.163541-163557
Main Authors: Wang, Shuchao, Zhou, Quan, Li, Jian, Liao, Ruijin, Wu, Nengcheng, Li, Yong, Chen, Minghao
Format: Article
Language:English
Subjects:
Accumulation
Aging
Charge density
Charge measurement
Cross-linked polyethylene
Cross-linked polyethylene (XLPE)
Crosslinking
DCP content
Density measurement
Dicumyl peroxide
improved pulsed electro-acoustic (PEA) method
Low density polyethylenes
low-density polyethylene (LDPE)
Permittivity
Permittivity measurement
Polyethylene
Reagents
Space charge
thermal aging
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Summary:This article presents the influence of thermal aging on space charge accumulation and dissipation of cross-linked polyethylene (XLPE) with different cross-linking agent contents. In this article, dicumyl peroxide (DCP) and low-density polyethylene (LDPE) respectively are used as cross-linking agent and basic experimental material. Additionally, an improved PEA method is used to measure space charge densities during voltage application and removal when thermal aging time respectively is 0, 5, 15, 30 and 80 days due to higher accuracy. And experimental results indicate thermal aging can introduce negative charge traps into pure LDPE and make space charges easier to inject and accumulate in pure LDPE and XLPE, but space charge densities in XLPE increase more rapidly as thermal aging time increases, moreover, thermal aging can simultaneously increase densities of deep and shallow charge traps in pure LDPE and XLPE, etc. And we have also explained the change of space charge accumulation and dissipation of pure LDPE and XLPE after thermal aging from the perspective of micro-structure change of pure LDPE and XLPE through the quantitative analysis of average charge densities. Besides, theoretical model of the average charge decay has also been summed up, and this model can perfectly reflect the dissipation of space charges in pure LDPE and XLPE of different thermal aging time.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.3021798