Effect of injected charge on the electrification of oil flowing past the surface of composite polymers

Research output: Contribution to journalArticle

Abstract

The factors affecting oil-flow electrification (OFE) in large forced oil-cooled electric power apparatus are experimentally investigated using a closed cycle model, and a coaxial test section comprising a charge injector. The streaming and leakage currents are measured to investigate the impact of injected charge on OFE interfaced with composite polymers. The results reveal that the magnitude and polarity of the injected charge, and the type of composite polymer and its impregnation resin, if it exits, cause evident qualitative as well as quantitative changes in the measured currents. Cellulose-based materials give the highest leakage current. For other composite polymers, the higher the number ofketonic carbonyls and/or delocalized states in the aromatic moieties, the higher is the leakage current, and hence the lower is the streaming current. Underflow conditions, the leakage current is lower than that under a stationary condition, but the trend is reversed at high temperature, especially for the HVDC case. Under HVAC, the streaming current shows polarity reversal from negative to positive on increasing the oil temperature and/or voltage. For HVDC application, the streaming current is significantly reduced by calendering the outermost layer of the composite polymer, using fine glass as a backing material instead of using glass fabric, and impregnating the composite polymer with highly dipolar epoxy resin.

Original languageEnglish
Pages (from-to)393-401
Number of pages9
JournalEuropean Transactions on Electrical Power
Volume11
Issue number6
Publication statusPublished - 2001

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Polymer Composites
Leakage Current
Streaming
Leakage currents
Charge
Composite materials
Polymers
Polarity
Calendering
Epoxy Resin
Glass
Injector
Coaxial
Cellulose
Reversal
Epoxy resins
Impregnation
Resins
Voltage
Oils

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

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title = "Effect of injected charge on the electrification of oil flowing past the surface of composite polymers",
abstract = "The factors affecting oil-flow electrification (OFE) in large forced oil-cooled electric power apparatus are experimentally investigated using a closed cycle model, and a coaxial test section comprising a charge injector. The streaming and leakage currents are measured to investigate the impact of injected charge on OFE interfaced with composite polymers. The results reveal that the magnitude and polarity of the injected charge, and the type of composite polymer and its impregnation resin, if it exits, cause evident qualitative as well as quantitative changes in the measured currents. Cellulose-based materials give the highest leakage current. For other composite polymers, the higher the number ofketonic carbonyls and/or delocalized states in the aromatic moieties, the higher is the leakage current, and hence the lower is the streaming current. Underflow conditions, the leakage current is lower than that under a stationary condition, but the trend is reversed at high temperature, especially for the HVDC case. Under HVAC, the streaming current shows polarity reversal from negative to positive on increasing the oil temperature and/or voltage. For HVDC application, the streaming current is significantly reduced by calendering the outermost layer of the composite polymer, using fine glass as a backing material instead of using glass fabric, and impregnating the composite polymer with highly dipolar epoxy resin.",
author = "Metwally, {I. A.}",
year = "2001",
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journal = "International Transactions on Electrical Energy Systems",
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AU - Metwally, I. A.

PY - 2001

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N2 - The factors affecting oil-flow electrification (OFE) in large forced oil-cooled electric power apparatus are experimentally investigated using a closed cycle model, and a coaxial test section comprising a charge injector. The streaming and leakage currents are measured to investigate the impact of injected charge on OFE interfaced with composite polymers. The results reveal that the magnitude and polarity of the injected charge, and the type of composite polymer and its impregnation resin, if it exits, cause evident qualitative as well as quantitative changes in the measured currents. Cellulose-based materials give the highest leakage current. For other composite polymers, the higher the number ofketonic carbonyls and/or delocalized states in the aromatic moieties, the higher is the leakage current, and hence the lower is the streaming current. Underflow conditions, the leakage current is lower than that under a stationary condition, but the trend is reversed at high temperature, especially for the HVDC case. Under HVAC, the streaming current shows polarity reversal from negative to positive on increasing the oil temperature and/or voltage. For HVDC application, the streaming current is significantly reduced by calendering the outermost layer of the composite polymer, using fine glass as a backing material instead of using glass fabric, and impregnating the composite polymer with highly dipolar epoxy resin.

AB - The factors affecting oil-flow electrification (OFE) in large forced oil-cooled electric power apparatus are experimentally investigated using a closed cycle model, and a coaxial test section comprising a charge injector. The streaming and leakage currents are measured to investigate the impact of injected charge on OFE interfaced with composite polymers. The results reveal that the magnitude and polarity of the injected charge, and the type of composite polymer and its impregnation resin, if it exits, cause evident qualitative as well as quantitative changes in the measured currents. Cellulose-based materials give the highest leakage current. For other composite polymers, the higher the number ofketonic carbonyls and/or delocalized states in the aromatic moieties, the higher is the leakage current, and hence the lower is the streaming current. Underflow conditions, the leakage current is lower than that under a stationary condition, but the trend is reversed at high temperature, especially for the HVDC case. Under HVAC, the streaming current shows polarity reversal from negative to positive on increasing the oil temperature and/or voltage. For HVDC application, the streaming current is significantly reduced by calendering the outermost layer of the composite polymer, using fine glass as a backing material instead of using glass fabric, and impregnating the composite polymer with highly dipolar epoxy resin.

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