Presently we are upgrading one of the feeder and connecting 4 Nos. 3CoreX300 Sq.MM cables, so we have problem of installling core balance CT.Whether we can install core balance CT in one of the cable so that it will serve the purpose of zero sequence earth fault protection?What about residual type of earth fault connection using O/C CT's in resdual format(Advnatage and deisadvantage over core balance ct.Experts guidence required.....
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