The power transfer is accompanied without frequency change. In an electronic system, the term power transformer is used to provide a number of AC supplies of several voltages and appropriate values of current from the public electricity supply.


  • Designed for trouble-free performance
  • Design conforms to IS 2026, BS 171, IEC 76 and other relevant standards
  • Low power loss and low noise
  • Designed to withstand electrical impulses, thermal and dynamic stresses
  • Optimum utilization of active materials for compactness
  • Modern manufacturing techniques ensure cost effectiveness and reliability


  • 3 phase, 50 Hz in voltages of 11 kV, 22kV, 33kV,66 kV& 110 kV & 132 kV
  • Off-circuit tap changer to provide ± 5 %, ± 7.5% & +5% to -10% taps in steps of 2.5%
  • On load tap changer to provide +5% to -15% taps in steps of 1.25%, 1.7%, 10-21 % @@ 1.75% as standard range & also custom built for any other ranges, OLTC will be internally / externally mounted as per requirement Class A, uniform/non-uniform insulated
  • Vector group Dyn 11,YNd 11,YNyn 0
  • Continuous duty, double copper wound
  • Painting as per IS/I EC standards
  • Both HV & LV side outdoor bushings or cable boxes
  • Cooling radiators/fans.
  • Standard fittings as per IS/IEC standards
  • Buchholz relay with alarm and trip contact with shut off valves
  • Oil temperature indicator with alarm and trip contact
  • Winding temperature indicator with alarm and trip contact
  • Magnetic oil level gauge with alarm contact
  • Marshalling box to house oil temperature indicator and winding temperature indicator
  • Cooler control unit
  • Neutral current transformer


  • Winding temperature indicator and oil temperature indicator with remote indication
  • RTDs for winding temperature measurement
  • Oil preservation system through air cell/thermosphyon filter
  • Neutral earthing bar with epoxy supports

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