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Answer Posted / s.panneer selvam
In Dy11 secondary leads primary by 90 degree means in case of any fault the secondary protection which is sensitive than primary will always senses the fault before and enable to trip. the reason behind is to enable protection not to allow more current to flow through the circuit in the event of fault or abnormality. star point needed for neutral and we use have single phase load are of secondary reason and i think the primary reason may be this which i read from MG say book
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