Products: Oil Cooled Transformers

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  Product Details
INDCOIL Power & Distribution Transformers incorporate modern Engineering concepts and high quality materials processed under expert supervision and quality control. The factory is equipped with all required machinery and Testing Equipment to produce transformers for a variety of applications.
Standard ratings from 15 KVA to 2000 KVA in close steps as per IS 2026 for all Input Voltages of 3.3, 6.6, 11, 22 & 33 kV and Out-put voltages of 380, 400, 415 or 433 Volts are available. Transformers manufactured by us conform to IS 2026 or IEC 60076.

Transformers are designed for maximum Efficiencies at following load-factors unless otherwise specified, Power Transformers - 0.45 to 0.65. Distribution Transformers - 0.4 to 0.5. We can supply transformers with non-standard Voltage Ratios, capacities and Efficiency Load Factors, for special applications. Our specialty is in design and manufacture of Transformers with multiple phases for use in variable speed drives and other converter applications. Prices will be available on request. Please send us details of your use with specifications of the Transformers
 Design & Constructional Features
Prime quality Cold Rolled Grain Oriented Silicon Steel (CRGO) of grade M4/M3, are used as core materials, depending on specific applications for the Transformer.

Windings are normally made with electrolytic grade Copper soft annealed and insulated with paper or enamel depending on ratings as well as voltage class. Special designs with Nomex covered conductors can be supplied, HV and LV windings are provided with end-turn reinforcement for protection under short circuits and lightning impulse. The windings are dried and pre-shrunk before assembling then in to the core. Windings with Copper or Aluminum or a combination of both can be supplied as per customer preferences. Sufficient radial and axial ducts provided, ensure proper insulation levels and avoid hot spots during surge voltages and short time over loads.

Tanks are designed with ample clearances for minimum stray losses. Local heating and eddy current losses are also kept minimal with non-magnetic welding at High Current areas. The tanks are of sturdy design to prevent even of sweating during the thermal cycles while in use. Tanks are pressure tested initially and completed Transformer pressure tested with all fittings.

Normally pressed steel raditors are used for cooling. Each bank of Radiators will be provided with air release plugs, drain cocks and lifting eyes. Transformers up to 500 kVA are provided with raditors welded to the tank. Higher ratings can be provided with Flanged type with or Without Raditor for valves.

 Taps and Terminals
HV and LV sides can be provided with cable box type or Out-door type terminations with or without palms for connections to cables of OH lines.
Standard ratings will have taps at -5% to +5% in steps of 2.5% on the HV side connected through off-circuit tap changes with indicator and locking device. Additional taps and On Load Tap changing devices with remote Control can be provided at extra cost.

 Dimensions and Details














25 1.1 0.5 1.2 360 70 0.1 0.68 4
50 1.2 0.9 1.4 530 100 0.18 1.10 4
63 1.2 0.9 1.4 610 1120 0.22 1.25 4
100 1.3 1.1 1.5 800 135 0.29 1.76 4
160 1.4 1.1 1.5 1050 230 0.41 2.55 4
200 1.4 1.1 1.6 1200 245 0.55 3.20 4
250 1.5 1.2 1.7 1350 320 0.65 3.80 4
315 1.5 1.3 1.7 1550 360 0.85 4.50 4
400 1.6 1.4 1.8 1800 425 1.00 5.50 4
500 1.8 1.6 2.0 2300 490 1.20 6.60 4
630 2.0 1.7 2.1 2700 550 1.35 7.80 4
800 2.2 1.8 2.1 3150 750 1.50 9.40 5
1000 2.3 1.9 2.3 3700 1130 1.65 11.0 5
1250 2.4 1.9 2.4 4200 1700 1.75 12.5 5
1600 2.6 2.2 2.6 4900 2000 1.90 15.0 6
The above values are indicative for 11kV/433V ONAN Transformers with copper windings

  Flat/ Flanged Rollers
  Earthing Terminals
  Jacking Pads
  Radiator Valves
  Filter Valves
  Double Float Buchholz Relay with ATC*
  Conservator Shut off valve
  Oil Temp. Indicator
  Explosion Vent with Diaphragm
  Air release plugs
  Pressed steel Radiators
  Lifting Lugs / hooks
  Off circuit lockable Tap changer
  Rating & Diagram Plate
  Filter cum Drain Valve
  Oil Level Gauge
  Thermometer Pocket
  Silica gel Breather
  HV Terminals
  LV Terminals with neutral
  Additional Neutral Terminal
  WTI with Alarms & Trip Contacts*
  Marshalling Box with Spare terminals*

* at additional cost

  1. Detailed Dimensional Drawings along with actual performance parameters will be submitted within 2 to 3 weeks from receipt of confirmed orders.
  2. Transformers with performance values other than standard values can be made against specific enquiries
  3. Unless specifically quoted for the Transformers will be suitable for standard power and Distribution applications only under standard voltage and frequency fluctuation limits
  4. Transformers suitable for Converter and Inverter duties and with multi winding can be supplied on request
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