Standard

Powertek Transformers are designed as per IS : 2026, IS : 1180.

Vector Group

Transformers will be connected as per group reference Dyn 11.

Other groups can offered as specific requirements.

Temperature Rise

Transformers are designed for a maximum rise of 50/55°C Of oil/winding, lower temperature rise can be offered on request.

Windings/Coils

All windings are made from Electrolytic grade copper as per requirement Of customer. The conductor is in the form Of triple or double paper covered insulated strip and wire.

Windings are designed to optimize dynamic, thermal, mechanical and electrical structure depending upon current and voltage requirement.

The type of winding commonly used is spiral, crossover, disc, helical winding are used depending upon specific design criteria.

The solid insulation used in the winding is either in the form rectangular spacers or blocks assembled from pre compressed high density press board.

It is the component of winding which imparts the desired mechanical strength.

The low voltage winding of transformer are fabricated from heavy copper bars which can withstand high currents as well as severe mechanical stress without damage.

Core & Winding Assembly

Inner view of Distribution Transformer

The winding are assembled in the core and are supported radially by carefully designed number Of pre compressed pressboard spacers to withstand the radical force under short circuit.

The core and winding assembly is dried in electric oven. The process consist of heating the active part to a temperature between 90-120°C.

Fabrication

In house facility is created for tank manufacturing and are made with specialized TIG and MIG Welding Machines.

Tank are fabricated out of good quality steel sheets and special attention is paid to avoid unnecessary welds to reduce chance of leakage.

High quality standards are obtained and each tank is tested for leakage and deformation to achieve 100% customer satisfaction.

Paint

Utmost care is taken during painting of transformer.

Two component like Zinc Chromate Primer is applied with an intermediate coat prevent any rusting due to harsh atmosphere pressure and weather condition.

Top coat of PU paint as per RAL shades is applied for smooth surface and protection against moisture during export.

Transformer Oil

Oil is used as a coolant conforms IS335 is centrifuged and filtered before filling into the transformer.

Dehydrated EHV grade mineral oil is used which is directly purchased in tankers from refineries.

Testing

Routine test like measurement of resistance, no load losses, load losses, impedance turn ratio, separate source voltage test, induced over voltage withstand test are conducted as per IS:2026.

Fitting & Accessories

• Conservator
• OFF Circuit Tap Changer
• HV Bushings
• Air Release Plug
• Rating & Diagram Plate
• Explosive Vent
• Thermometer
• Silica Gel
• Oil Level Gauge
• LV Bushings
• Lifting Lugs
• Radiator
• Earthing Terminal
• Roller (Uni-directional/Bi-Directional)

Transformer Design Option

• Single Phase/Three Phase
• Indoor/Outdoor
• Pole Mounted/Ground Mounted
• Conventional Type/Hermetically Sealed Type
• Conventional Radiator/Corrugated Radiator
• Copper Wound
• Fitting Accessories as per requirement

Warranty & After Sale Service

We are totally warranted against any manufacturing defect & faulty workmanship.

Every transformer sold is backed by our excellent and prompt service network.

Our organisation is well known by virtue of strong support in terms of pre sales and after sales services rendered by us during any emergency solution.

Tappings

A. Off Circuit Tap Changing Switch

Tapping from +5% to -5% in step of 2.5% HV variation or as customer’s requirement.

B. On Load Tap Changer

Tap changing range up to ±15% in 1.25% steps.

Tapping range as per specific requirement can be offered.

OLTC for remote/auto/parallel operation can also be offered.

Cable Box & Bushing

Following arrangements are provided:

• HV-Bare or cable box bushing
• LV-Bare or cable box bushings
• Disconnecting chamber can also be provided on both HV & LV side

Cable bushings conform to IS:3347, 2099.

HV/LV bushing terminals of brass/copper conformers to IS:3347 metal parts.

Gasket & Joints

All gaskets used for making oil tight joints are made with cork as base bonded by oil resisting synthetic material or Neoprene. Neoprene is used for oil tight joints for HV & LV terminals. The gasket conforms to IS:4253 Part-II-1980.

Quality & Routine Tests

Our Transformer undergo rigorous quality control checks and are routine tested as per IS in our fully equipped laboratory. Any specific test required by the customer can also be arranged. Note: Transformer with other rating voltage ratio, vector group, terminal arrangement can be offered as customer requirements. Fittings like Cable Boxes, Gas Operated Relay, RTCC Marshalling Box can be provided as requirement.