Vidyut is having latest manufacturing facility in industrial area of Adipur, Between 2 International Kandla & Mundra Port.


  • 150 Ton Eot Crane
  • Ac Dust Proof Winding Shop Up To 100 MVA 220 kV Class
  • Dehydration oven up to 100 MVA 220 kV Class
  • Testing facility up to 100 MVA 220 kV Class
  • In house Facility upto 100 mva 220 kV Class
  • In House Heat Run tes Facility up to 100 MVA 220 kV Class


  • Manufacturing of all types of transformers up to 132 kV Class.
  • Refubrishment/ Repairing Upto 100 MVA 220 kV Class
  • Conversion Of 6.6/11/22/33/66/132/220 kV Class Transformer
  • Capacity Enhancement Without Changing C&W
  • Re Design Of Same Transformer With Low Losses


We have separate winding shop with 8 No. of Winding Machine Facility up to Manufacturing of 100 MVA 220 kV Class Windings with only collapsible former & Electric Bending Machine & Hydraulic Shearing Machine in shop.

Disc winding is used for high voltage winding. For higher voltages the interleaved form of the disc winding has a great advantage to increase series capacitances and consequently to obtain uniform transient overvoltage distribution on the winding.

Helical type windings are used for most low-voltage windings. Each turn consists of a group of conductors which are continuously transposed to reduce eddy losses.

Regulating winding is a helical type of winding and designed in such a way that each tap winding segment is evenly distributed over the entire length of the main windings.

By using such windings, the Ampere turn distribution provides an electromagnetic balance regardless of the selected Lapping position.

Cross Transposed conductors (CTC) its special type of winding which reduce the additional losses. It consists of a number of transposed bunch profile conductor.

Careful after treatment plays a decisive role in order to prepare the windings for the high demand of operation. Therefore they are pressed, dried under constant pressure, oil-impregnated, exactly Measured and if required, readjusted geometrically

S- Bend Machine

L-Bending Machine

15 - Ton Eot Crane For Winding Shop

10 - Coil Clamping Set

Dust Proof Air Conditioned Winding Shop

Winding Machine Capacity Up To 100 MVA 220 kV Class

High Precisible Collapsible Formers

Electrical Brazing System


At the assembly stage, the mechanical stability of the windings plays a particularly important role.

End and tapping leads of all the windings are connected by special extra flexible, insulated copper cables, which are rigidly braced in position. In oil forced units, oil is circulated inside the winding by specially designed pipes of insulated materials.

High mechanical rigidity is achieved by hydraulic pressing at calculated force and tightening all pressure screws. The core-coil assembly is put into the oven for dehydration process.


We have Dehydration Facility upto 100 MVA 220 kV Class

Another main component besides the core and the winding is the tank of a Power Transformer. It accommodates the active part and the oil filling. After vacuum drying process the active part is removed from the Oven and all components subject to the shrinkage are tightened again. The core & cel assembly is then placed into the tank and property lacked up during the transformer manufacturing process.

The temperature and exposure time is monitored during this time to ensure that the transformer is not too cool by the time it is get off from the oven. While in higher rating transformer, the vacuum is drawn for a period of time dependent on the voltage of the unit and time for which the active part was exposed to the atmosphere and the humidity at the time. The vacuum period is between 12 to 35 hours. Meanwhile the external wiring and termination work to be completed as per customer requirements.


We have in house Impulse Facility upto 100  MVA 220 kV Class, In House Heat Run Facility up to 100 MVA 220 kV Class at Our plant.

The process of manufacturing quality transformers is critically dependent on testing of raw materials, components and final assembled product. We are equipped with state of the art testing facilities to perform all routine and special tests.

The design element quality control is carried out at each manufacturing step. The final tests are made at the automated test field. Our transformers go through various below tests in our laboratory order to deliver the best of the transformers that are reliable and maintenance free.

Our Transformers undergoes below testing at each manufacturing step

  • Magnetic circuit assembling for losses
  • Active part assembling before outputs soldering
  • Active part assembling after outputs soldering
  • Tap-changer connection
  • After tanking of final transformer


  • Lightning Impulse test with chopping
  • Electromagnetic tests
  • Excitation current of transformer
  • Dielectric tests
  • Partial discharge measurements
  • Load loss and no load losses
  • Insulating strength measurements
  • Noise-level measurements
  • Temperature rise test
  • Tan Delta And SFRA Test