SDTL manufactures EHV Power Transformers of voltage class upto 132 KV using advanced technology & state of art machinery. Windings are made on automatic machines, the core & coil assembly is dried in vacuum drying oven of capacity 70 cubic meters. Transformers are rigorously tested at each stage of using modern testing equipments. We has already supplied more than 20 EHV transformers upto 40 MVA rating which are successfuliy operation for more than 5 yrs.

Technical Specifications

Ratings CRGO - Upto 40 MVA
Applicable Standards IS, IEC, ANSI, JIS, DIN, BS Etc.
Cooling ONAN, ONAF
Insulating Fluid Mineral Oil to specification
Frequency 50 Hz, 60 Hz
Polarity As specified
Primary Voltage 66 KV,110KV, 132 KV (as per customer specification)
Secondary Voltage 66KV, 33KV (Other Voltages as required)
Winding Material Copper
Taping range Off circuit and On load tap changers as per customer specification
Impedance In line with applicable standards.
  • Solar - Stardelta
  • Solar - Stardelta
  • Solar - Stardelta
  • Solar - Stardelta
  • Solar - Stardelta

Standard Fittings

include Lifting Lugs, Skid Base / Roller Arrangement, Rating and Diagram Plate, HV & LV Bushings with fittings, Oil level Guage, Silica gel Breather, Drain/Filter Valves, Thermometer, Pressure Relief Device / Explosion vent.

Optional Fittings

include Terminal Connectors, Magnetic Oil Level Guage, Oil Temperature Indicator, Winding Temperature Indicator, Buchholz Relay, RTCC Panel, Condenser Type Bushing for voltage class of 33 kV & 66 kV, Off circuit Tap Switch / On-load Tap Changer with RTCC, HV / LV Cable Boxes, Disconnecting, Epoxy / Touch proof Bushings with connector, Siphon Thermo Filter, Conservator, Arcing Horns, Aircell, Nuetral CT.Technical Specifications.

Successfully Completed

Client Description Quantity Remarks
EMCO (Nashik/Jalgaon) 20 MVA 66/11KV
10 MVA 110/33KV
MPPTCL (Jabalpur) 20 MVA 132/33KV
40 MVA 132/33KV
Complete Rebuilding
Complete Rebuilding
Nakoda Ispat Ltd. (Raipur) 25 MVA 132/11KV 1 New
Hira Ferro Alloys Ltd. (Raipur) 25 MVA 11/33KV 1 New