The earthing transformer is used for limiting earth fault current during earth fault created in the system and simultaneously distribution transformer is used for supplying auxiliary supply of 415 volts for the substation, The values of zero sequence Impedance are specified according to short time neutral current to the fault condition. Auxiliary Transformer is according to the specifications SAN 780 IEC 60076, Auxiliary Transformer is fitted with an Off Circuit tap switch on HV side & housed in common tank, Such ratings up to 500 kVA and up to 34.5 kV.

The earthing transformer is used for limiting earth fault current during earth fault created in the system and simultaneously distribution transformer is used for supplying auxiliary supply of 415 volts for the substation, The values of zero sequence Impedance are specified according to short time neutral current to the fault condition. Auxiliary Transformer is according to the specifications SAN 780 IEC 60076, Auxiliary Transformer is fitted with an Off Circuit tap switch on HV side & housed in common tank, Such ratings up to 500 kVA and up to 34.5 kV.