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LT PANEL INSTALLATION

SRI LANKA
We start  LT Panel Board installation work recently to take  stepup  our business , In my knowledge the controlL system wiring for earth fault relay we use sunt trip for  MCCB and  core balance transformer  for annlize  leakage current  in balance of 3 phase /neutral .  My question is some  technician use separate CT,s for this system instead of core balance  CT

Is it ok
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    it maybe - how are the current transformer secondary voltages being combined to create the errror signals?
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    it maybe - how are the current transformer secondary voltages being combined to create the errror signals?
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