NDLI: Control of electrical tree at initiation stage in LDPE by mixed addition of Al<sub>2</sub>O<sub>3</sub> nano-particle and azobenzoic compound

Content Provider	IEEE Xplore Digital Library
Author	Yamano, Y.
Copyright Year	1994
Abstract	A new polymer nano-composite was prepared by the mixed addition of azobenzoic compound ('Az compound') and Al₂O₃ nano-particle ('Al2O3') into LDPE to improve the electrical treeing resistance under ac voltage application. Three kinds of azobenzoic compound were tested: azobenzen ('Ab'), nitro-azobenzen ('Ni_Ab') and aminoazobenzen ('Am_Ab'). No dispersant was used for the particles. The test materials of the mixed addition were processed in our laboratory by solution casting method. The experimental results showed that the most effective tree resistance was observed in the mixed addition compound where 'Ab' was used. Tree initiation voltage (TIV) was increased by the mixed addition. A 300% increase in ratio was obtained when the concentrations of 'Ab' and 'Al₂O₃' were 2.0 wt% and 3.0 wt%, respectively. The incubation time (the period of time from voltage application to tree initiation) was significantly elongated by the mixed addition. The incubation time for mixed addition under a constant voltage of 13 kV was about 100 times longer than that of LDPE without any additive. The mixed addition was also effective in the control of tree development in its initiation stage. PD due to tree initiation was reduced to an undetectable level under the constant applied voltage of 10 kV following a short time application of over voltage. The undetectable state continued for more than 2000 min under constant voltage application, whereas, in the case of LDPE without any additive, PD could not be restricted to the undetectable level. It was revealed that the mixed addition of 'Ab' and 'Al₂O₃' was significantly effective in the control of tree development in the initiation stage. On the other hand, the mixed addition has no significant effect on the control of tree development after its initiation stage.
Sponsorship	National Natural Science Foundation of China (NSFC) Region Centre Ville de Tours Conseil General D'Indre et Loire ABB IEEE Sandia National Laboratories TOSHIBA
Starting Page	209
Ending Page	216
Page Count	8
File Size	2136500
File Format	PDF
ISSN	10709878
Volume Number	21
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Aluminum oxide Compounds Voltage measurement Polymers Resistance Time measurement polyethylene insulation Nanotechnology polymer nano-composite nano-particles electricalinsulation trees
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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