Solar and renewable projects.
Define the network duty.

A useful starting point

A renewable project may need a step-up or collector-network transformer, an auxiliary distribution unit, or another arrangement identified by the EPC designer. The generating capacity alone does not settle the transformer rating, voltage, duty or construction. OSTL welcomes a project-specific discussion; this page does not claim a past solar installation or a pre-approved inverter transformer.

Typical needs to define

• Provide the single-line diagram, inverter or generator interface information, operating cycle and relevant network requirements.
• Have the project engineer define any harmonic, reverse-power, earthing, protection and fault-level requirements that affect the design.
• State site exposure, access and the intended energisation sequence; agreed supply and dispatch scope may differ from site commissioning.

Which transformer type fits?

Power transformers may enter the discussion for the network interface, and distribution transformers for auxiliary loads, subject to the actual duty. Dry-type construction may be considered for a suitable installation up to 3 MVA, but it is not automatically appropriate for an outdoor renewable site. No dedicated inverter-duty capability, special insulation arrangement or renewable utility approval is implied.

What to send for a quote

• Inverter/generation interface and study requirements, not just plant MW.
• Required winding connections/taps and any project duty-cycle schedule.
• EPC or utility technical specification, inspection schedule and delivery destination.

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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