Raipur, Urla and Siltara: specify the industrial duty
A factory distribution transformer and a process-duty transformer are not interchangeable just because the kVA looks similar. For an industrial transformer enquiry in Siltara or Urla, describe the process, running load, motor starting, operating cycle and any converter-fed equipment. Include the purchaser’s voltage, vector-group, impedance, tapping and loss requirements rather than assuming a catalogue design.
For general plant supply, compare power transformers and distribution transformers. A proposed 500 kVA or 1000 kVA rating still needs an agreed electrical schedule. The site engineer should confirm the load assessment and system interfaces before a rating is selected.
Bhilai, Durg and Raigarh: separate process and auxiliary loads
For a steel or metal-processing enquiry, identify whether the transformer feeds the furnace/converter itself or the plant’s auxiliary distribution. Send the furnace or converter supplier’s schedule, operating cycle, current profile and interface drawing where applicable. Do not select a standard distribution unit as a substitute for a special-duty design.
Use the furnace transformer or rectifier/converter-duty guide for the relevant specification questions. Those ratings are as per project requirement; this regional guide does not introduce a standard furnace or converter range. The steel & metal industry guide connects the different plant duties without claiming local projects or customers.
Korba and Bilaspur: define the site load and installation
For auxiliary power, industrial facilities or mining-related sites, identify the receiving equipment and duty explicitly. An auxiliary distribution requirement is not the same enquiry as a generator step-up or another specialist plant interface. Submit the actual single-line diagram and rating for feasibility review against OSTL’s confirmed range.
Include dust exposure, ambient conditions, indoor/outdoor location, ventilation, cable approach and maintenance access. If dry-type construction is being considered, assess the installation environment and the separate limit of up to 3 MVA. For a packaged installation, coordinate compact-substation and LT/control-panel interfaces; their ratings are as per project requirement.
CSPDCL-related enquiries: compare the actual purchaser schedule
Where a CSPDCL or other purchaser specification applies, send its current technical schedule, guaranteed technical particulars, loss/efficiency requirements, inspection stages and manufacturer-eligibility conditions. Check the applicability of BIS documents and type-test evidence to the tendered equipment. A works notice for augmentation or additional transformers is not automatically an order for a new OEM transformer.
Clarify whether the enquiry covers only equipment or also named packing, transport, insurance, unloading and inspection responsibilities. Compare loss figures at the same stated conditions; do not treat an EE level, a BEE label and purchaser acceptance as interchangeable. Review the tender documentation checklist and routine testing guide. No automatic CSPDCL vendor approval is claimed.
Howrah dispatch: check the last receiving point
Give the exact delivery location in Chhattisgarh, not only “Raipur” or “Korba”. Describe approach-road and gate restrictions, turning space, lifting arrangements and unloading responsibility. Confirm transport dimensions and mass against the offered design before the carrier and site team agree handling arrangements.
For exposed or dusty installations, ask the project designer to specify the required protection, clearances, ventilation and water-management provisions. Freight and site handling depend on the agreed scope; no local warehouse, ready stock or fixed delivery time is implied. For repairs and after-sales support, send the equipment nameplate, fault details and requested scope separately.
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.