How can we calculate ngr resistance for a generator and
Transformer ?
What type of transformer requires ngr ?
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Answer Posted / madivalanagaraja@gmail.co
It is similar to the ground resistor calculation for transformer
The typical example was answered earlier for transformer dt.19-06-2009
Neutral of transformer can be grounded solidly earthed OR with Neutral Grounded with Resistance.
Typical shunt calculations fro 5 MAV 11/6.6 kv transformer neutral are as :_
Transformer rating = 5 MVA
Voltage ratio = 11/6.6 KV
Vector Group = Dyn11 (6.6 KV ground through Resistor)
During Earth fault voltage between Neutral
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