Power Transformer

Power Transformer

Power transformers are designed to be used for step-up and step-down applications in the transmission network of higher voltages like 400 kV, 200 kV, 110 kV, 66 kV, 33 kV, etc. The transformers are generally rated 200MVA and above. The design makes the transformers 100% efficient in transmitting heavy load and high voltage i.e., higher than 33 KV. If compared to the size of the distribution transformers, these transformers are bigger and are used in transmission substations, generating stations and application areas requiring high insulation levels.

We produce power electrical transformers of capacity up to 50 MVA, 3 Phase, up to 132 KV Class, ONAN/ONAF/OFAF/OFWF Cooling. Our transformers are popular for their trouble-free long performance, reliability and very competitive prices.

Features of Power Transformers

  • Designed for 25 years of trouble-free performance.
  • The design conforms to IS 2026, IEC 60076, ANSI and other relevant standards.
  • Low power loss and low noise.
  • Designed to withstand electrical impulses and thermal and dynamic stresses.
  • Optimum utilization of active materials for compactness.
  • Modern manufacturing techniques ensure cost-effectiveness and reliability.

Optional Accessories

  • 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.


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