Industrial plants.
Make the duty explicit.

A useful starting point

A factory enquiry may involve a new electrical installation, a replacement or additional process capacity. Motors, drives and other loads can create different operating demands. These are reasons to send a measured or engineered load brief, not to assume a standard transformer configuration or an unverified specialised product line.

Typical needs to define

• Separate present operating demand from connected capacity and any future expansion allowance.
• Identify relevant motor-starting, non-linear load, duty-cycle and network information for the engineer’s assessment.
• For a replacement, provide the existing nameplate, drawings, terminal interfaces and shutdown constraints.

Which transformer type fits?

Power or distribution transformer selection follows the plant network duty and confirmed design range. An indoor dry-type interest is limited to the confirmed range up to 3 MVA and still needs an agreed installation brief. Copper and aluminium winding choices should be compared within the whole performance schedule. Furnace, rectifier or other specialised transformer capability is not claimed on this page.

What to send for a quote

• Load schedule and any specified starting or harmonic-study requirements.
• Performance schedule, winding preference, protection and cable/busduct interfaces.
• Shutdown constraints, unloading access, quantity and requested dispatch timeline.

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.

Prepare the next conversation