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Project specification

Transformer Technical Data Sheet

Specify your transformer in one place. Complete the known requirements across eight sections, or download the original worksheet for your engineering team.

Complete online Download Excel worksheet
Project & contact

Fields marked * are required. Leave unknown optional parameters blank and add any questions in the notes.

01General information6 parameters
Oil-immersed, dry-type or compact substation; describe step-up / step-down and power / distribution duty in the notes.
Distribution, rectification, wind, solar or another application.
02Rated electrical parameters14 parameters
State the primary-side voltage; identify whether this is the HV or LV side.
State the secondary-side voltage; identify whether this is the HV or LV side.
Confirm which winding receives the incoming supply. This is essential for the voltage ratio, insulation and tapping requirements.
Specify the primary-side and secondary-side currents.
For example: Dyn11, YNyn0 or YNd11.
For example: ±2 × 2.5%.
Direct, isolated, resistance grounding or another arrangement.
03Losses & performance8 parameters
Requested guaranteed value.
Requested guaranteed value.
State the required efficiency class or applicable loss limits.
Specify top-oil and average-winding temperature-rise limits.
04Insulation & cooling6 parameters
Specify lightning impulse (LI) and power-frequency withstand (AC).
A / E / B / F / H, as required.
ONAN / ONAF / AN / AF, as required.
For example: IP21 or IP54.
05Environment & installation11 parameters
Flag installations above 1,000 m for engineering review.
Specify the applicable pollution class.
Cable, busbar, overhead or another connection arrangement.
06Load & system5 parameters
THD and individual harmonic content, where known.
07Tests, standards & certificates7 parameters
State the required standard and edition: IEC / IEEE / GB / EN or another specification.
Confirm whether buyer-witnessed factory or site acceptance testing is required.
State the certificates required for your destination, such as CE / UL / CSA / SASO. Availability must be confirmed.
08Commercial & delivery7 parameters
For example: sea-freight wooden crate; specify any ISPM 15 requirement.
For example: FOB / CIF / DDP; include the named place or port.
Specify months or years.
For example: instruction manual, wiring diagrams and test reports.
Additional requirements

Values entered here are your requested requirements. The proposed design, performance and certificates must be confirmed in the technical proposal.