Results 241 to 250 of about 4,358 (304)
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Pole Fires Due to Insulator Contamination
Transactions of the American Institute of Electrical Engineers, 1948WOOD POLES and crossarms of overhead electric lines may become ignited and damaged when the surface of the insulators and wooden parts are contaminated by industrial dirt and exposed to fog or light drizzle. A few pole fires have occurred in the Chicago area under circumstances which gave a basis for further laboratory study.
W. H. Wickham +2 more
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Performance of dust-contaminated insulators in fog
Electrical Engineering, 1948This paper presents a discussion of the problem of line insulator contamination by dust and the subsequent performance of the insulators in fog-laden atmospheres. A pioneer investigation of the subject carried out by the Department of Water and Power at Ryan High-Voltage Laboratory of Stanford University is described.
Bradley Cozzens, T. M. Blakeslee
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Insulation characteristics of contaminated vacuum
Conference Record of the 1988 IEEE International Symposium on Electrical Insulation, 2003Results are presented relating to the outgassed products from three common insulating polymers under vacuum at elevated temperatures up to 400 degrees C. Nylon-6, polymethylmethacrylate and polytetrafluoroethylene (PTFE) have been studied. PTFE is the most stable, while nylon-6 outgasses large quantities of water vapor.
I.D. Chalmers, G.R. Sankey, R. Mahmood
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Investigation of the Insulation Condition of Contaminated Solid Epoxy Insulators
2020 IEEE 1st International Conference for Convergence in Engineering (ICCE), 2020This paper reports the assessment of impurities of solid Epoxy insulator by sensing Polarizing and Depolarizing Current under high voltage excitation. Several impure Epoxy samples were created carefully by contaminating different level of carbon dust particles within it.
Sandipan Kumar Paul +3 more
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Design of insulators for severe contamination
Proceedings of 5th International Conference on Properties and Applications of Dielectric Materials, 2002Under severe contamination, typified either by sand dust storm or heavy salt fog ceramic insulators experience problems such as high leakage current, burning of crossarms and flashover. Several years of field tests in heavily polluted areas around the world have demonstrated that hybrid insulators with highly protected creepage designs are very ...
R.J. Chang +4 more
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Hydrophobicity and insulated resistance of composite insulators with biological contamination
2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE), 2016Biological growth has been observed on insulators installed all over the world. However its impact on the electrical performance is not well known. This paper described the investigations on the performance of post insulators with biological growth at a converter station. Both the ceramic and composite insulators were investigated.
Gulin Xia +4 more
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Chemical Contamination as Causes of Electrical-Insulation Failure
Transactions of the American Institute of Electrical Engineers, 1945Electrical-insulation failures were investigated and found to be due to chemical contamination with ionizable materials. Examples of such contamination are certain types of hand creams, soldering fluxes, and germicides in lubricating oils. Contamination mechanisms often involve operations which are otherwise insignificant in manufacturing processes ...
C. H. Braithwaite, G. L. Moses
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Insulator behavior in contaminated atmospheres
1969 9th Electrical Insulation Conference, 1969The conditions leading to flashover in contaminated atmospheres are very complex and do not always permit simple choices of insulator types for good performance. Increased understanding concerning performance under salt contamination has been realized, and reasonably good correlation between artificially contaminated insulators and pollution under ...
F. J. Turner, M. Kawai, J. Kaminski
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Dechlorination and Reclamation of PCB-Contaminated Insulating Fluids
IEEE Power Engineering Review, 1983A process was developed by Ontario Hydro Research to dechlorinate PCBs in contaminated insulating fluids and reclaim the insulating fluids after treatment, thus alleviating a growing environmental hazard. The contaminated fluids, containing up to several thousand milligrams of PCB per kilogram (ppm) are contacted with metallic sodium at moderate ...
W.J. Janis, J.S. Ferrie, J.M. Braun
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IEEE Transactions on Dielectrics and Electrical Insulation, 2012
This paper attempts to address the influence of sugar as a contaminant on outdoor insulation characteristics of insulators in a substation. Strong discharge activity was occurred under relative humidity less than 80% on insulators in a 500 kV substation at south China.
Hongwei Mei +3 more
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This paper attempts to address the influence of sugar as a contaminant on outdoor insulation characteristics of insulators in a substation. Strong discharge activity was occurred under relative humidity less than 80% on insulators in a 500 kV substation at south China.
Hongwei Mei +3 more
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