Utility procurement.
Separate design fit from eligibility.

A useful starting point

Power utility and DISCOM buyers work from technical schedules, acceptance requirements and procurement eligibility rules. A transformer may fit a requested range but still need design review, licence-scope verification and buyer-specific qualification. This page makes no approved-vendor, empanelment or utility-registration claim.

Typical needs to define

• Send the complete tender specification, amendments, guaranteed technical particulars and drawing requirements.
• Identify losses, impedance, temperature, interface and inspection requirements with reference conditions.
• Separate technical conformity from commercial qualification, past-performance criteria and utility-specific vendor status.

Which transformer type fits?

Power and distribution discussions fall within the overall confirmed company range, with every exact rating/voltage combination to confirm. Dry-type is a separate line up to 3 MVA and should be requested only where the buyer specification calls for it. BIS IS 1180 applicability must be checked for the actual category and design; it is not blanket approval for all transformer types.

What to send for a quote

• Tender reference, complete schedule, amendments and bid/dispatch deadlines.
• Required current BIS scope, drawings, test documents and any inspection/witnessing schedule.
• Buyer-specific vendor/registration requirements and who holds responsibility for bid eligibility.

Also include the required rating, HV/LV voltage, phase, frequency, winding preference, quantity and delivery state/country. Mark unknown values for confirmation rather than copying assumed defaults.

Documents and project-specific confirmation

OSTL acquired BIS licences in all five major transformer categories in 2020. Request the current licence documents and the applicable product/rating scope; this is not evidence of registration or approval by a utility or procurement platform. Routine tests per IS 1180 / IS 2026 are confirmed; the applicable standard and agreed test/document schedule must be checked for the offered design.

OSTL has manufactured transformers since 2007. The corporate office is in Kolkata and the transformer manufacturing unit is in Howrah, West Bengal. Discuss your brief with the Kolkata office on +91 93310 15264 or ostltd@hotmail.com.

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