Calculation of Ninimum Safety Distances for Live-Line Mintenance - A Statistical Mehod Applied to 765 kV AC Itaipu Lines
This paper presents a statistical method to calculate the miniumm safety distance for live-line maintenance. The method takes into account the complexity of the tower gap configuration and the presence of the lineman working at the line potential. It includes the inherent dispersion of the dieletric characteristics of the air gaps such as the probability of flashover and the tirnes-to-flashover. Laboratory tests were also performed to corroborate the results of the study, checking not only the performance of the various live-line tools but also the effectiveness of the by-passing insulators protective device and the occurrence of broken insulators in the string.
Use of portable protective gaps on the California-Oregon transmission project compact 550 kV line
This paper presents result of research on the application of a portable protective gap (PPG) to live work on a compact 550 kV steel lattice tower, The objective of the research was to provide experimental evidence which confirms the needed coordination of the PPG sparkover characteristics with the sparkover characteristics of the worksite on the compact tower during live work. Sparkover characteristics of the worksite are strongly affected by the presence of the worker, the live working tools, and damaged insulators.
METIFOR-A Statistical Method forInsulation DesignofEHV Lines
~~~~~~~~~~PER 1000 andtheyhavesimilar effects whenenergizing acapacitive01.8 ~~~~~~~~~~~~~to fulfill thecriteria established. Theauthors gratefully acknowledge thecontributions oftheir many associates whoseresearch work,discussions, anddirect assistance WVhile thediscussion hereisconfined toelectric systems, and wereofimmense value.Ofparticular mention arethediscussionsmoreparticularly totransmission lines themselves, thestated andsuggestions ofH.C.S.ThomandC.J.Bulgarelli oftheUnited arguments arefoundtobeinherent inpractically anydesign StatesWeatherBureau;G.K. Carter, P.MX. Cabral, andMv. S. Dyrkaczfortheirprograrnming ofmuchofthework;D.D.M'vac-problem. Carthy andE.M.Hunter fortheir encouragement andguidance; Design criteria maybefurtheT subdivided intocases where