Distribution Transformer Manufacturer Kolkata, India

A specification-led enquiry

A distribution transformer connects a supply requirement to the loads that must be served. The useful starting point is a load assessment and the actual system voltages, not a single catalogue photograph or an assumed standard configuration. A buyer, consultant and manufacturer need a shared specification before quotations can be compared.

OSTL has manufactured transformers since 2007. Our Howrah manufacturing unit and Kolkata corporate office serve as the manufacturing and enquiry locations for this discussion. The confirmed power and distribution manufacturing range extends up to 10 MVA and up to 66 kV, subject to confirmation of the specific product and combination.

Row of finished grey distribution transformers with brown bushings on the OSTL production floor in Howrah, under a chain hoist — Batch production at our Howrah works: real photograph.

In-house handling and dispatch

Finished transformers are handled in-house at our Howrah works and prepared for dispatch. Share the delivery location and any site-access or unloading constraints with your enquiry so dispatch can be planned.

Forklift handling a finished oil-filled transformer at OSTL ahead of dispatch — In-house handling ahead of dispatch: real photograph.

Turn a load requirement into an enquiry

Separate connected load from the expected operating load. Diversity, starting demand, power factor, duty pattern and future changes should be reviewed by a qualified project engineer before a rating is selected.

Identify the supply authority or tender specification that applies. Include the technical schedule rather than assuming that a transformer acceptable for one project automatically meets another project’s requirements.

For a replacement, share the existing nameplate, cable or bus interfaces, available space and access route. Confirm whether the old installation constraints still apply to the new design.

Confirmed range. Details to request.

Distribution Transformers — quotation inputs
Item	What to provide or confirm
Requested kVA	The proposed rating and supporting load information; sizing remains a project-engineering decision.
Supply and output	Actual HV / LV voltage, phase and frequency; do not rely on a rating-only description.
Loss and performance schedule	The specified loss limits, impedance and temperature conditions, where required by your project.
Installation conditions	Indoor/outdoor location, ambient conditions, altitude, site exposure and access restrictions.
Winding material	Copper or aluminium preference, with product-specific selection confirmed by OSTL.
Configuration requirements	Any cooling, core, tapping, vector-group, enclosure or protection requirement for technical confirmation.
Standard and licence scope	The applicable product standard and exact BIS licence/category coverage where required.
Delivery and paperwork	Quantity, destination, timeline, drawings, test records and inspection requirements.

Copper, aluminium and configuration choices

Copper and aluminium windings are confirmed OSTL capabilities. Ask for the design to be evaluated as a complete transformer, including the agreed performance requirements and interfaces, rather than treating winding metal as a universal ranking of quality. ONAN cooling and CRGO core requirements remain items to confirm, not promises inferred from the product illustration.

Rating examples are not stocked-model claims

If you are considering 160 kVA or 500 kVA, use the ratings enquiry guide to prepare the missing information. These figures are enquiry interests only on this website. They do not establish a stocked unit, an approved model, a particular voltage or a published price.

BIS IS 1180 and routine tests per IS 1180 / IS 2026 are part of OSTL’s stated quality framework. Obtain the relevant licence scope and project-specific technical confirmation. Loss values, dimensions, oil quantity, accessories and delivery terms must come from the agreed documentation, not from a generic rating label.

No fixed price, stocked-model claim, loss figure or dimensional drawing is published here. Product-specific performance and commercial terms must be confirmed in writing.

Useful next steps

RFQ WORKSHEET

Prepare a useful quotation brief

A practical technical and commercial checklist, plus a copyable/downloadable template.

SELECTION GUIDE

Dry type or oil filled?

Compare the installation, cooling, environmental and maintenance questions before choosing.

RATING ENQUIRIES

Transformer rating enquiries

Browse 16 interests from 63 kVA to 10 MVA. Confirm load, voltage and site requirements; no stock models are implied.

Questions before you enquire

Can I enquire about 160 kVA or 500 kVA?

Yes. Use either as an enquiry interest and supply the HV/LV voltage, load information, quantity and location. This is not a confirmation of stock, an approved model or a standard design.

Is every distribution transformer covered by one BIS licence?

Do not assume that. OSTL is licensed in five major transformer categories; ask for the exact licence scope and its applicability to your proposed unit.

Where should I send the specification?

Contact OSTL’s Kolkata corporate office by phone, email or WhatsApp. Include the technical schedule, rating, voltage, quantity, destination and requested timeline.