Power Transformers

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Power Transformers

Electrical components-the core-and–coil assembly and all current carrying parts are immersed under oil in a controlled environment preventing contamination by ambient outdoor air, industrial environments, Salt spray and other.

Coil Construction

Coil design and quality are key to transformer efficiency and longevity. TTE designs coils specifically for each application. We use thermally upgraded paper for longest insulation life.

Cooling ducts formed with rigid, high – density spacers facilitate free oil circulation.

Quality – Upon completion each coil is evaluated and tested.

Core Construction

Built-lap, miter or step-lap-miter construction is chosen based on the application and core loss requirements.


The core is designed with optimum flux density to minimize core loss and cost. Built-lap, miter or step-lap-miter construction is chosen based on the application and core-loss requirements.


AISI-grade–H0, M3, M4 or other–high–permeability steel is used. Laminations are burr free and very thing– between 0.007 and 0.013 inch, varying no more than +-0.002 inch in length for the lowest sound level and excitation currents. Each lamination is covered with a high-resistance, inorganic coating to reduce eddy currents.


The laminations are handled with minimum bending to preserve the low loss properties. The core is clamped in a rigid frame with uniform pressure to reduce mechanical effect on performance.

Cooling Fluids

Material oil of reputed make (Power oil/Transol) is supplied for outdoor applications and low-flash point liquids are offered for indoor applications. Seal materials, cooling constants and component ratings determined by the type of fluid used. Quality of Transformer oil is as per IS:335

Tank and Radiators

The tank is fabricated of high-quality, heavy-gauge steel plate. It is designed to withstand operating pressure and vacuum as well as the stress of shipping, rolling and jacking.

Final Assembly

Fittings, gauges and controls are assembled on the tank. Control wiring is completed and tested and the core-and-coil assembly is placed in the tank after necessary treatment to improve IR value.

Bushing and other equipment are installed and wired after the coils are covered with oil in a controlled environment.

Plate–type, convection-cooling reditors are tested to withstand the transfomer's operating pressure and vacuum. Raditor supports on the tank wall are designed to withstand shipping stresses. Removable members are used to provide additional support.

The tank surface is cleaned to prepare for protective coating for the industrial environment. After a though leak check the tank is covered with a rust-inhibiting primer.

After drying, two coats of gray enamel paint are applied for a durable and attractive finish. Careful attention is given to detail in constructing each component of liquid-filled transformers.


The company has the facility to conduct all standard routine test as per IS 2026 and conducts the entire test before dispatch to ensure the materials has trouble free at the customer premises.