NDLI: Mechanism of space charge accumulation in crosslinked polyethylene under temperature gradient

Content Provider	IEEE Xplore Digital Library
Author	Mingli Fu Shuai Hou Tong Liu Zepeng Lv Kai Wu Ya Wang Xia Wang
Copyright Year	2015
Description	Author affiliation: Electr. Power Res. Inst., China Southern Power Grid, Guangzhou, China (Mingli Fu; Shuai Hou; Tong Liu) \|\| State Key Lab. of Electr. Insulation & Power Equip., Xi'an Jiaotong Univ., Xi'an, China (Zepeng Lv; Kai Wu; Ya Wang; Xia Wang)
Abstract	Space charge will accumulate within polyethylene when stressed under DC high voltage, and a temperature gradient will form throughout the insulation when a HVDC cable is in service. Previous research has revealed that temperature gradient can enhance hetero charge accumulation at the low temperature end, but the high temperature only helps a small quantity of homo charge accumulate, and the mechanism was explained for hetero charge formation due to ionization of impurities within the insulation and blocked extraction of injected carriers. However there is no direct evidence to distinguish whether the hetero charge is injected carriers or the ions. This paper intends to investigate and explain the influence of temperature gradient onto hetero charge formation. It was concluded that temperature gradient across the sample thickness could affect the space charge through its influence to the mobility of carriers, and the temperature difference between two electrodes could also influence the entire space charge distribution through its influence to the charge injection and extraction. The space charge distribution in cross-linked polyethylene (XLPE) samples with different thickness under different temperature differences and temperature gradient was investigated. The results show that both the temperature difference between the electrodes and the temperature gradient across the thickness can enhance the hetero charge accumulation.
Starting Page	356
Ending Page	359
File Size	764343
Page Count	4
File Format	PDF
ISSN	21609241
e-ISBN	9781479989034
DOI	10.1109/ICPADM.2015.7295282
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-07-19
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature distribution Space charge Temperature measurement Electrodes Voltage measurement Ionization thickness dependence XLPE space charge temperature gradient blocked extraction
Content Type	Text
Resource Type	Article

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Simulation of space charge distribution in polyethylene under a temperature gradient

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The temperature dependence of space charge accumulation and DC current in XLPE power cable insulation

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Study of the space charge behavior in polyethylene nano-composites under temperature gradient

The effect of degree of cross-linking on accumulation of space charge in cross-linked polyethylene (XLPE)

The effect of temperature gradient on space charge accumulation at SR/XLPE interface under DC stress

Mechanism of space charge accumulation in crosslinked polyethylene under temperature gradient

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