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Standards for Insulating links
ANSI/CPLSO-14
ANSI/UL2737 (Withdrawn)
ASTM F2973
MIL-L-24410 (Withdrawn)
Tests by Independent Organizations
Load Insulator
Miller & Hirtzer
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390 CONCLUSIONS This paper analyzed the operation of an insulating link when a crane contacts a transmission line and concludes that the electric stresses on the link are significantly different from a transmission line insulator. The major differences are the duration of energization and the method of contamination. Different links' performances are evaluated and operational problems are identified. A new link, similar to line insulators, is developed and described. The paper presents a modified test method and measures the flashover probability of different insulator links in contaminated conditions. AUTHORS' BIOGRAPHIES A new probabilistic risk analysis is proposed to assess insulator link efficiency. This method uses pollution, wetting and flashover probability to calculate the risk of link failure. The paper concludes that the risk of failure can not be determined using the results of standard pollution tests. REFERENCES 1. 2. 3 4. 5 6. 7 8 9. 10. 11. 12. D.V. MacCollum, "Critical hazard analysis of crane design," Professional Safety, January 1990. D.E. Dickie, "The impact of training and certification in Ontario, Canada, North American Construction Safety Conference, Washington, DC. 1991. Vincent J. Abramo, "Case Studies 29 CFR Subpart N ELEVATORS and CONVEYORS ," Rutgers University, 1978. Joseph-Jean Paques, "Crane accidents by contact with power lines", Safety Science, 16 pp. 129-142, 1993. George 6. Karady, "Efficiency of Insulating Link for Protection of Crane Workers", IEEE Trans. Power Deliverv, Vol. 6, No 1, Jan. pp. 316-323, 1991. "Insulated Link", US Patent 2,897,257, July 28 1958, United State Patent Office. "Insulated Link", Catalog, H.J. Hirtzler & Associates, Lafayette, Ca 94549, 1981. "Miller Insulator Links", Catalog SSP Construction Equipment Inc., Pomona Ca. 91766. H. B. Hamilton, J.D. Morgan, "Final Report on an evaluation of mobile crane safety devices, Bucyus Erie Inc., 1982. J. Derald Morgan, "Insulated Link Test Using EC 507 Artificial Pollution Methods", A.B. Chance Company, Centralia, Mi. 1992. Ontario Hydro Report No. ET91-94-P, "Electrical Tests on Insulating Crane Links", August 13, 1991. CEILEC Standard 507: 1991, "Artificial pollution test on high voltage insulators to be used on ax. systems", Second eclition, 1991-04. 1926-550-556, CRANES, DERRICKS, HOISTS, George Karadp (SM70, F78) received his BSEE and Doctor of Engineering degree in Electrical Engineering from the Technical University of Budapest in 1952 and 1960, respectively. He was appointed to Salt River Project Chair Professor at Arizona State University in 1986, where he is now responsible for electric power education and performs research in Power Electronics, High Voltage Techniques and Electric Power. Previously, he was with EBASCO Services where he served as Chief Consulting Electrical Engineer, Manager of Electrical Systems and Chief Engineer of Computer Technology. From 1969 to 1977, he worked for the Hydro Quebec Institute of Research as a Program Manager and in 1976 was elected to Research Fellow. Dr. Karady is the Chairman of the IEEE Subcommittee on Lightning and Insulator, WG on Non-Ceramic Insulators and Insulator coordination. He was a member of the CIGRE US National Committee, where he has served as Vice President and Secretary-TreaSUrer. He is a registered professional engineer in New York, New Jersey and Quebec. Minesh Shah received his BS degree in Electrical Engineering from Gujarat University, India, in 1988 and MS degree in Electrical Engineering from Arizona State University, in 1992. He has worked on several projects related to outdoor insulation. He is presently working towards a Ph.D. degree at Arizona State University. His main research interests are high voltage insulation and the characterization of insulating and semiconductor materials. He is a student member of the IEEE. Denis Dumora: was born in Bordeaux (France) on June 2nd 1943. He obtained his "Doctorat es Sciences" in 1971 at the University of Sciences of Bordeaux. From 1971 to 1980, he was involved in ceramic research in the R & D Ceramic Division of CERAVER. Since 1980, he his in charge of material research in the R 62 D Division of SEDIVER @ranee). His research interests include electrical insulation and behavior of inorganic and organic materials. Dr. Dumora is a senior member of the IEEE. Power Engineering Society, of the IEEE Dielectrics and Electrical Insulation Society and of S.E.E. -a).
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