Installation N Commissioning Of Ngr System At Secondary Side Of Marson Make 1 Mva. 11Kv /3.3Kv Power Transformer At Amritnagar Colliery And Supply, Installation, And Commissioning Of Neutral Grounding Resistor(Ngr) For 2Mva, 11Kv/3.3Kv And 750 Kva, 11Kv/3.3Kv Power Transformers Installed At Narayankuri Departmental Substation Under Mahabir Colliery Of Kunustoria Area.