Transcription of HIGH VOLTAGE ENGINEERING(3:1:0), - VSSUT
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HIGH VOLTAGE ENGINEERING(3:1:0), - VSSUT
HIGH VOLTAGE ENGINEERING(3:1:0), 8th Sem. (Electrical), VSSUT . MODULE-I (10 HOURS). Conduction and breakdown in gases: Gases as insulating media, Ionisation processes. Townsend current growth equation. Current growth in the presence of secondary processes. Townsend's criterion for breakdown . Experimental determination of ionization coefficients. breakdown in electronegative gases, time lags for breakdown , streamer theory of breakdown in gases, Paschen's law, breakdown in non-uniform field and corona discharges, Post breakdown phenomena and applications, practical considerations in using gases for insulation purposes.
SF 6 (hexafluoride) are used. Gases consist of neutral molecules, and are, therefore, good insulators. Yet under certain conditions, a breakdown of the insulating property occurs, and current can pass through the gas. Several phenomena are associated with the electric discharge in gases; among
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