• Voltamp Transformers Private Limited

Cast Resin Transformers

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Voltamp Transformers Private Limited offers Cast Resin (Dry Type) Transformers.

Manufacturing Process Core
Three limb core construction is used. Core sheets conforming to drawings are made from Cold Rolled Grain Oriented (CRGO) Silicon Steel sheets. Individual sheets come duly coated with inorganic insulation. Circular Core cross section is used which is obtained by assembling number of steps of different widths. Number of steps and step widths are optimised to gain maximum advantage. Mitred joints are used between the limb plates & yoke plates. Fibre -glass tape banding hold the core tight and reduce the noise level. Treatment given to the completed core protects it from atmospheric corrosion.

Windings
Both the H.V. and L.V. windings are made from copper conductors. Round wire, rectangular strip or foil is used depending on current to be carried. Layer type or cross over type winding is used depending on current / voltage to be handled. Windings are cast under vacuum. This is carried out in our state of the art, Automatic Casting Plant manufactured by world leaders M/s. Heidrich, Germany.

On the H.V. side, inserts are provided to receive tap changing links. Inter connections between H.V. phases are obtained by links made out of copper tubes with their ends formed into lugs. These links are insulated by means of heat shrinkable tubes.

Protection
Protection against Overload/high winding temperature can be provided by Thermistors. ALAAM and TRIP are provided, when required, by means of Thermistor or RTD sensors can be provided with 2 set points.

Advantage of Cast Resin Transformers

• No Fire Hazard.
• Near Load Center or even near to load.
• Low as transformer is near to load. Also cable drop is reduced.
• Negligible smoke generation.
• Suitable for indoor use as no fire risk.
• Can be fitted outdoor in IP 45 enclosure.
• Suitable for as low as -25° C ambient temperature.

The company also offers Cast resin Power and Distribution Transformers, Converter Transformers, Transformers with On Load Tap Changers (OLTC), Motor - starting Transformers, Testing Transformers, etc.