Varanasi and Gorakhpur: start at the receiving end
For a campus, commercial building, hospital or factory, state the proposed connected load, demand assessment and whether the transformer supports a new installation or an existing network. Give the site engineer’s HV/LV voltages, protection and cable/interface requirements. A city-specific enquiry still needs a project-specific electrical design.
Compare distribution transformers with dry-type transformers using the actual installation constraints, not a rule that one construction suits every building. Include room ventilation, service access and the project’s fire/environment requirements. The hospital & commercial and campus guides help organise these questions.
Prayagraj: replacement is not automatic upsizing
A damaged transformer’s nameplate is the starting point, not the whole replacement specification. Send clear nameplate photographs, the single-line diagram, measured or assessed load and the reason for replacement or augmentation. Confirm vector group, impedance, tapping, neutral/earthing arrangements, footprint and terminal positions against the receiving system.
If considering a change from the existing rating, have the project engineer review upstream protection, cables and installation space. A 1000 kVA enquiry needs the same disciplined schedule as a 500 kVA quotation; neither is selected by locality alone. For a combined installation, agree the compact-substation and LT/control-panel interfaces separately.
Sonbhadra and Renukoot: identify process versus auxiliary duty
For an industrial transformer supplier enquiry in Renukoot or Sonbhadra, distinguish plant power/distribution from a furnace or converter connection. Give the load cycle, current profile, equipment interface and purchaser’s requirements for losses, taps, impedance and inspection. Process examples are buying contexts, not claims of OSTL projects in these locations.
Use power transformers for the appropriate plant-power questions and the furnace or rectifier/converter-duty guide for specialist equipment. Special-duty ratings are as per project requirement. For a solar installation, provide the inverter supplier’s interface schedule through the solar/inverter-duty guide rather than assuming a standard distribution design.
Purvanchal procurement: separate equipment supply from works
For a PuVVNL or other purchaser requirement, use the current technical schedule and bill of quantities. Replacement, capacity-enhancement or maintenance notices can include works or handling of utility-stock transformers; they are not automatically purchases of new equipment from an OEM. Confirm the scope before requesting a manufacturing quotation.
Ask for the applicable manufacturer/vendor eligibility, loss requirements, guaranteed technical particulars and inspection/test documents. BIS scope, ISO management-system certification and purchaser approval are separate checks; no PuVVNL approval is claimed. Use the tender document checklist and routine testing page to prepare a comparable enquiry.
Site access and monsoon conditions belong in the RFQ
Give the exact receiving site in eastern Uttar Pradesh and identify approach-road, gate and vehicle restrictions. Confirm turning space, lifting arrangements, unloading responsibility and installation access against the offered transport dimensions and mass. Dispatch is planned from Howrah; no local stock or fixed transit time is promised.
Where water accumulation, dust, high ambient conditions or restricted indoor ventilation may affect the installation, include those site conditions for design review. Confirm the proposed equipment location and project designer’s protection, drainage, clearances and maintenance-access requirements. Send existing equipment details separately for repair and after-sales enquiries; support scope is agreed, not assumed from the destination.
Howrah manufacturing. A project-specific design.
Established in 2007, OSTL manufactures at Unit 1 (Howrah) and Unit 2 (Sankrail, Howrah), West Bengal. Enquiries are coordinated through the Kolkata corporate office. This is supply-from-Howrah guidance, not a claim of a branch, warehouse or local stock in the destination region.
The overall oil-filled power/distribution range is up to 10 MVA and up to 66 kV. Dry-type transformers are up to 3 MVA. These are separate capability boundaries, not a guarantee of every rating/voltage/duty combination. Furnace, rectifier/converter, solar/inverter-duty, compact-substation and LT/control-panel ratings are as per project requirement.
OSTL is ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 certified. Confirm the applicable BIS licence scope for the proposed equipment. Product compliance, management-system certification and purchaser/vendor acceptance are different checks. Review quality documents and the manufacturing process.
Compare scope before comparing price
A transformer quotation depends on the specified equipment and agreed responsibilities, not a regional price list. State copper or aluminium winding requirements, construction/cooling, the required loss or EE criteria, accessories, tests and quantity. Confirm where ONAN or another cooling arrangement is actually required; do not assume one construction or efficiency label suits every duty.
- Rating; HV/LV voltages; frequency; vector group, impedance and tap requirements.
- Load profile, operating cycle and any furnace, converter or inverter interface.
- Loss/efficiency schedule, applicable purchaser standards and required inspection/test documents.
- Site environment, layout, terminations, footprint and any replacement nameplate/drawings.
- Exact receiving point, access restrictions and agreed packing, transport and unloading scope.
Use the quotation checklist or prepare the enquiry. Contact WhatsApp +91 70035 13107, call +91 70035 13107, 033 4061 3200 or ostltd@hotmail.com. Prices, freight and delivery dates are quoted for the agreed scope, not published as fixed regional figures.