Experience with ultrahigh-speed reclosing of high-voltage transmission lines

THE basic principles of ultrahigh-speed reclosing of high-voltage transmission lines have been presented previously before the Institute.¹ Although, as has been explained, the effects and phenomena behind these principles are generally known, there are still a number of unknown factors that have not been explored fully and the effects of which need be known to make a thorough and scientific application of these principles. Among these are further data on the effects of breaker time and elapsed time between clearing of the arc and the re-energization of the circuits on the deionization of the arc and the re-establishment of the insulation strength of the surrounding area; data on the probable extent of and total time elapsed, as well as time between intervals of multiple strokes; knowledge concerning the effects of the quantity and the type of load on the likelihood of restriking or the failure of lines to hold when re-energized by virtue of system drifting away from synchronism; and, finally, data on the dead time needed on phase to phase faults to prevent restriking.