نتایج جستجو برای: overhead line
تعداد نتایج: 441554 فیلتر نتایج به سال:
Electrical companies routinely inspect their overhead lines by helicopter. Current detailed aerial inspection approach uses trained inspectors who fly aboard helicopters to inspect the lines with binoculars and cameras, while recording the data in a logbook. The procedure is performed while the helicopter hovers over and around power lines and structures, creating an element of danger for the p...
The principle is shown for lightning protection of power distribution lines taking the effects of surge arresters, overhead ground wires and their combined use into consideration. Moreover an outline of a rational design method targeting direct lightning hits, induced overvoltages and backflow currents from high structures.
This paper studies the effect of various mitigation loop configurations namely: single horizontal mitigation loop (two conductors), two separate horizontal mitigation loops (four conductors) and single vertical mitigation loop (two conductors), on the magnetic field produced by 220 kV double-circuit overhead transmission line. Also, in this paper a further reduction in the magnetic field is ach...
Overhead transmission lines are the main form of high-voltage and UHV long-distance transmission. When line path passes through limestone areas, mining areas others, possible existence karst caves mined-out under tower base will have a greater impact on stability foundation. According to previous detection experience, different underground cave forms requirements need choose suitable technology...
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