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Answer Posted / d m fulzele
ACTUALLY CT SECONDARY NEVER GROUNDED, CT WHEN CHARGED IT IS LOADED WITH BURDEN OF IT`S SECONDARY SHORT CIRCUITED.
CT IS OPPOSITE TO NORMAL TRANSFORMER. THE PRIMARY CURRENT IS DEPEND ON SECONDARY LOAD CURRENT IN NORMAL TRANSFORMER WHERE AS SECONDARY CURRENT IS DEPEND ON PRIMARY LINE CURRENT. IN CASE OF CT PRIMARY CURRENT IS VERY HIGH. THIS HIGH CURRENT PRODUCES FLUX IN CORE AND THIS HIGH FLUX INDUCES EMF IN SECONDARY WINDING. SINCE THE NUMBER OF TURNS IN SECONDARY ARE MORE, EMF INDUCES IS MORE AND IF SECONDARY IS OPEN THIS HIGH VOLTAGE MAY DAMAGE INSULATION AND CAUSE CT BURST. IF CT SECONDARY IS CONNECTED WITH LOAD OF SHORT CIRCUITED, THE LOAD CURRENT WILL FLOW AND THIS LOAD CURRENT WILL PRODUCES ITS OWN FLUX. THIS FLUX IS OPPOSITE TO MAIN FLUX AND RESULTANT FLUX WILL BE LOW AND HENCE THE EMF INDUCES WILL BE LOW. HENCE IN CT SECONDARY IS ALWAYS SHORT CIRCUITED OF CONNECTED WITH LOAD.
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