Why Nutral CT rating for Earth Fault Protection of Transformer neutral shall be 20% of Full load Current of Transformer
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CT rating is the same as that of line CTs .Only the relay
setting for earth fault is 20 % of OCR
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What is the function of Lightning Arrester & Wavetrap in Power system ??
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In order that work may be done:(a) Two wires are necessary(b) The circuit must have a switch(c) Coal must be burnt(d) A supply of energy is required
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State angle criterion.