Power Transformer
Power transformers sit higher up the network than distribution units: they connect transmission or sub-transmission voltages to a plant or substation bus, and handle ratings measured in MVA rather than kVA.
Each unit is engineered around the rating, voltage class, vector group, impedance and cooling (ONAN/ONAF) you need, with tapping arrangements to suit the grid.
Power Transformer specifications
| Specification | Value |
|---|---|
| Type | Oil Cooled Type |
| Rating | Up to 10 MVA |
| Voltage Class | Up to 66kV |
| Voltage Ratio | 33kV/22kV/11kV/6.6kV/3.3kV |
| Frequency | 50 Hz |
| Phase | 3 Phase |
| Cooling Type | ONAN/ONAF |
| Vector Group | As Required |
| Winding Material | Copper |
| Insulation Class | A |
| Tapping | Off Circuit Or On-Load Tap Changers for HV/LV Variation As Per customer's specification |
| Impedance | In Line With Applicable Standards/ customer's specification |
| Applicable Standard | IS, IEC, IEEE etc. |
Ratings shown are typical catalogue values. Final specification is confirmed per order.
Power transformer selection points
A power transformer is a long-life asset, so the specification should look ahead. Confirm the MVA rating at the cooling stages you need (for example ONAN/ONAF), the HV and LV voltages, the vector group needed for paralleling with existing units, the percentage impedance that limits fault levels, and whether the tap changer must be on-load or off-circuit.
Also define the protection and monitoring fittings – Buchholz relay, oil and winding temperature indicators, pressure relief device – and the loss figures you will evaluate in the tender. For the downstream network see distribution transformers and VCB panels; for solar evacuation, see the inverter duty transformer.
Where it is used
- Grid and industrial substations
- Steel, cement and chemical plants
- Solar and wind evacuation
- Large campuses with their own HT network
Power Transformer – FAQ
What information is needed for a power transformer quotation?
MVA rating, primary and secondary voltages, vector group, impedance, cooling type, tapping range, installation (indoor/outdoor) and the standard to be followed.
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