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Transmission and Distribution Construction and Live Line Maintenance, 1993. Proceedings from ESMO-93., Sixth International Conference on

12-17 Sept. 1993

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  • Proceedings of ESMO '93. IEEE 6th International Conference on Transmission and Distribution Construction and Live-Line Maintenance

    Publication Year: 1993
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    Freely Available from IEEE
  • Assessment of historical magnetic field dosages received by Eskom's live line maintenance personnel

    Publication Year: 1993, Page(s):105 - 116
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A number of epidemiological studies have indicated that exposure to magnetic fields in certain work environments has possible detrimental health effects. A limitation of most of these studies, however, is the inaccurate assessment of historical exposure to magnetic fields. This paper describes the preliminary results of a study conducted by Eskom to assess the historical magnetic field dosages rec... View full abstract»

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  • Research and new development in live working in Ukraine

    Publication Year: 1993, Page(s):341 - 358
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (932 KB)

    Live working on transmission lines in the Ukraine was started in the 1940s, subsequently ceased in the 1960s and was resumed in 1982. At present all energy enterprises have sets of appliances and personnel trained for live working. The report includes results of live working safety examination, the issue of human protection from the harmful impact of electromagnetic fields, the accident probabilit... View full abstract»

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  • The AC discharge characteristics of composite gaps of tension insulator string in 220 kV line

    Publication Year: 1993, Page(s):251 - 256
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The operation by which linemen enter a strong electric field to change damaged insulators (with o resistance) along a tension insulator string in 220 kV lines has the advantage of simple operation and high efficiency. When linemen enter an electric field along the insulator string, it is in the movement condition. The working positions vary with the position of the damaged insulators. It is very i... View full abstract»

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  • Helicopter airborne services live line work

    Publication Year: 1993, Page(s):74 - 87
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1148 KB)

    For many years the helicopter has been used as an auxiliary aid in the construction and maintenance of electric lines. Since 1988, helicopters' technical abilities have widened the aeronautical field of activities. EDF-STH (Services et Travaux Heliportes) has thus developed methods and material to perform maintenance work on EDF electric cables, on dead and more particularly an live lines. Linemen... View full abstract»

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  • Selection and use of fall protection and rescue equipment for work on towers

    Publication Year: 1993, Page(s):117 - 126
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    This paper outlines fall protection and rescue alternatives for work on overhead power line towers. It focuses mainly on fall arrest systems which can be used for climbing towers, moving on tower members and working at various locations on and outboard from structures. These techniques may be used for work on station structures as well View full abstract»

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  • Experience of live-line maintenance on 500-1200 kV lines in Russia

    Publication Year: 1993, Page(s):359 - 368
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The authors evaluate the electrical flashover strength of various insulator strings on 500-1200 kV lines, when replacing defective insulators by the live-line maintenance method, to ensure that the lineman will not be subjected to a flashover. Electrical testing of various insulator strings with defective insulators in different positions were carried out at an outdoor high-voltage facility. This ... View full abstract»

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  • Fiber-optic cable installation method

    Publication Year: 1993, Page(s):259 - 271
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    A new method for installing fiber optic cables in ducts is currently being used utilizing high speed air flow coupled with a low strain pushing force. Developed in Europe, this method has recently undergone testing and trials in the United States using different sized cables and ducts in varied environments. Erratic duct geometries have little influence over this method, and multiple units may be ... View full abstract»

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  • Electronic airborne inspection method for overhead transmission power-lines

    Publication Year: 1993, Page(s):89 - 93
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    Overhead transmission power lines are the most cost effective and frequently used carriers for electric energy. Exposure to environment accelerates deterioration, originating small failures, some of them, if not timely detected and repaired, to become serious problems with time. Electric utilities, seriously motivated to drop maintenance costs, under growing demand for reliable energy supply, run ... View full abstract»

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  • Safety and technique of hot washing

    Publication Year: 1993, Page(s):225 - 239
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    As a maintenance method, hot line washing has been used widely to prevent insulators from pollution flashover in power stations in China. This paper presents the study results of the insulation characteristics of the washing stream and the insulators being washed. The minimum distance between the nozzle tip and the energized part and the effective washing procedure which can ensure the safety of b... View full abstract»

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  • Computerized design of overhead transmission power lines

    Publication Year: 1993, Page(s):199 - 203
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The conventional design of overhead transmission power lines by manual survey, mapping and design techniques, involve costly and time consuming activities. Massive documentation is accumulated during the preliminary studies of terrain, alternative routes selection, power-line hardware configuration, cost-effectiveness-performance optimization, and more. Additional time consuming and costly paper w... View full abstract»

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  • Innovations in live line maintenance for high voltage substations (⩾63 kV) at EDF (Electricite de France)

    Publication Year: 1993, Page(s):169 - 184
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    EDF, as a goal, plans to extend live working while working on maintenance and renovation of HV substations. As a result of the analysis of the stakes and techniques adopted, the document shows the ultimate developments and the prospects of evolution at mid-term View full abstract»

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  • Electrical contact accident with a welding machine

    Publication Year: 1993, Page(s):127 - 143
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    In 1991, a Bonneville Power Administration (BPA) worker suffered severe injury during an electrical contact accident involving a welding machine. This incident occurred during a complete station outage at a BPA substation. Injuries to the employee consisted of muscle, tissue, and bone damage to one of the worker's shoulders. Tests simulating the accident were performed at BPA's High Voltage Labora... View full abstract»

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  • Live-working techniques on 220 kV long-span towers

    Publication Year: 1993, Page(s):369 - 384
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1100 KB)

    This paper outlines integrated live-working techniques, designed by Harbin Power Bureau, to solve the problem of operating on 220 kV long-span towers. It also describes replacement methods for a whole string of suspension insulators and a whole string of tension insulators on on a live line, an oiling method for the release clips (suspension type) of conductors, an examination method for conductor... View full abstract»

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  • Switching on by-pass currents during live-line maintenance operations

    Publication Year: 1993, Page(s):273 - 291
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    Technical literature about live working has been mainly devoted to problems related to electrical insulation of the network, especially distances to maintain between linesmen and live parts. This paper concentrates on aspects related to current in electrical installations as it may become necessary, during live maintenance, to separate temporarily these installations from the network. Risk analysi... View full abstract»

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  • Derivation of live-line minimum approach distances for the 1993 NESC

    Publication Year: 1993, Page(s):7 - 35
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1176 KB)

    The objective of this paper is to provide the background data for the derivation of the National Electrical Safety Code (NESC) 1993 Edition Minimum Approach Distances. Values in this paper reflect the changes to the Tables and the supporting paragraphs contained In the Tentative Interim Amendment (TIA) issued in 1993. Sufficient data is given to verify the minimum approach distances. The data was ... View full abstract»

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  • The new technology for improving the tensile strength of insulation rope

    Publication Year: 1993, Page(s):399 - 400
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    This paper researches the use of fibre materials to make insulation ropes for live-line work, the tensile strength of this improved rope (using new weave technology) is increased by 25% compared to that of the old type of rope. The new type of rope has the advantage of smooth surface and the weave technology in not complicated. This paper discusses the advances in new insulating rope technology in... View full abstract»

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  • Assessing the significance of annual magnetic field dosages received by live line maintenance personnel

    Publication Year: 1993, Page(s):97 - 104
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Information about the significance of magnetic field dosages received by live line workers is scarce. This paper describes an attempt to assess the significance of magnetic field dosages received by live line workers during live line operations. The assessment was done by comparing historical dosages received by Eskom's live line workers with insignificant, marginally significant and significant d... View full abstract»

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  • Live line working at distribution voltage in Hungary, in Central Europe

    Publication Year: 1993, Page(s):331 - 339
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    After a ten-year-period of introduction, live line working (LLW) by “hot-stick” method is generally used in the Hungarian 20 kV distribution networks. However, utilization is below the expected level. In the fast changing political and economic life of Central Europe, wider utilization of LLW is expected, and the electrical utilities are preparing to meet customers' demands. New method... View full abstract»

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  • HVDC and impulse tests for hotline insulator washing and change-out on BPA's HVDC Intertie

    Publication Year: 1993, Page(s):241 - 249
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    HVDC tests were performed to establish parameters and techniques to safely hotline high pressure wash insulator strings on BPA's section of the DC Intertie, energized at ±500 kV. Parameters investigated included nozzle distance from the conductor, water pressure, nozzle orifice, water resistivity, and washing technique. Switching impulse tests were performed on nonceramic suspension insulat... View full abstract»

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  • Helicopter installation of fiberoptic groundwire on overhead lines

    Publication Year: 1993, Page(s):67 - 73
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    This paper pertains to the innovative use of contractor-provided helicopter-airborne services as a replacement for some of the conventional work methods that would typically have been used on an optical ground wire retrofit program View full abstract»

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  • Cleaning energized equipment using dry ice pellets

    Publication Year: 1993, Page(s):209 - 223
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    As a result of a two-year study, Puget Power and Alpheus corporation, have demonstrated safe and effective cleaning of energized equipment using dry ice pellets. Dry ice (CO2) pellets are a natural fire extinguisher and exhibit a dielectric strength approximately equal to that of air (30 kV/cm). The pellets disappear instantly on contact, so there is no secondary waste stream to create ... View full abstract»

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  • Bonneville Power Administration's wood pole management program

    Publication Year: 1993, Page(s):185 - 198
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    Bonneville Power Administration (BPA) has been engaged in an active wood pole maintenance program for over 30 years. During this time, the Agency faced many challenges pertaining to wood pole problems, particularly the Western Red Cedar and Douglas-fir pole species. As a result of programs developed and implemented over the years for correcting internal and external decay (rot) situations, BPA has... View full abstract»

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  • Barehand bonding arc electrical characteristics test

    Publication Year: 1993, Page(s):149 - 168
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    In July, 1991, the California Department of Occupational Safety and Health issued a variance to Pacific Gas and Electric Company to allow the use of barehand work procedures on 230 kV and 500 kV transmission lines. There were requirements and restrictions imposed upon PG&E for issuing and maintaining this variance permit. One such requirement was that PG&E institute a program to evaluate a... View full abstract»

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  • Analysis of electrical aging effects of insulating tools for EHV live working

    Publication Year: 1993, Page(s):393 - 398
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The recent explosion accidents of rigid insulating tools for EHV live workings are introduced and long-term electrical aging experiments of 500 kV insulating tools are carried out. Based on these results, the electrical aging breakdown model of long insulating tools under high electric fields is researched and new concepts of effective insulation length and safe use time of insulating tools for li... View full abstract»

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