DocumentCode :
1182763
Title :
Chemical group in crosslinking byproducts responsible for charge trapping in polyethylene
Author :
Hirai, Naoshi ; Minami, Ryutaro ; Tanaka, T. ; Ohki, Y.
Author_Institution :
Dept. of Electr., Electron. & Comput. Eng., Waseda Univ., Tokyo, Japan
Volume :
10
Issue :
2
fYear :
2003
fDate :
4/1/2003 12:00:00 AM
Firstpage :
320
Lastpage :
330
Abstract :
It is known that space charge is formed in cables insulated with crosslinked polyethylene. It is probable that the crosslinking byproduct or the crosslinked polymer morphology is responsible for the space charge. In order to examine the former possibility, an additive-free low-density polyethylene sheet was soaked in various liquid chemicals including the crosslinking byproducts and space charge distribution inside the sheet was measured under DC voltage application. As a result, space charge appears in the vicinity of the injecting electrode only in the case that the sheet was soaked in the liquids with at least one hydroxyl group in their structures. Therefore, it is concluded that cumyl alcohol, which is the only byproduct with a hydroxyl group in its structure, is responsible for the formation of space charge in polyethylene on the assumptions that chemical functions of a given molecule act separately from each other and that other contributions such as the crosslinked polymer morphology are negligible.
Keywords :
charge measurement; insulation testing; polyethylene insulation; power cable insulation; space charge; DC voltage application; LDPE; additive-free low-density polyethylene sheet; cable insulation; charge trapping; chemical functions; chemical group; crosslinked polyethylene; crosslinked polymer morphology; crosslinking byproduct; crosslinking byproducts; cumyl alcohol; hydroxyl group; injecting electrode; liquid chemicals; polyethylene; space charge; space charge distribution measurement; Cable insulation; Charge measurement; Chemicals; Current measurement; Electrodes; Morphology; Polyethylene; Polymers; Space charge; Voltage measurement;
fLanguage :
English
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
Publisher :
ieee
ISSN :
1070-9878
Type :
jour
DOI :
10.1109/TDEI.2003.1194118
Filename :
1194118
Link To Document :
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