Solar Inverter Duty Transformer (IDT)
An inverter duty transformer (IDT) connects solar inverters to the medium-voltage grid. Unlike a normal distribution transformer it must cope with inverter harmonics, DC injection and a load that rises and falls with the sun every day, and it often has two or more LV windings, one per inverter.
We supply IDTs specified to your inverter make, number of LV windings, MV voltage and site conditions, for ground-mount and rooftop plants.
Solar Inverter Duty Transformer (IDT) specifications
| Specification | Value |
|---|---|
| Type | Oil Cooled Type |
| Rating | Up to 10 MVA |
| Voltage Class | Up to 33kV |
| Voltage Ratio | 1.1kV/0.800kV/0.660kV/0.630kV/0.440kV/0.415kV |
| Frequency | 50 Hz |
| Phase | 3 Phase |
| Cooling Type | ONAN/ONAF |
| Vector Group | As Required |
| Winding Material | Copper/Alummium |
| 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.
Matching an IDT to your solar plant
The inverter decides most of the transformer design. Share the inverter datasheet – AC output voltage, rated power, number of inverters per block – so the LV windings can be matched; dual or multi-winding designs let several inverters share one unit. Also confirm the MV collection voltage, the required impedance, and the site ambient temperature and altitude.
An IDT normally sits between the solar ACDB on the LV side and the HT switchgear on the MV side. See the complete range of solar equipment, including solar inverters and PV modules, for a plant-level quotation.
Where it is used
- Utility-scale solar parks
- Captive and open-access solar plants
- Rooftop plants with MV evacuation
- Hybrid solar-wind plants
Solar Inverter Duty Transformer (IDT) – FAQ
How is an inverter duty transformer different from a distribution transformer?
It is designed for harmonic currents, frequent thermal cycling and, often, multiple LV windings matched to the inverters, with electrostatic shielding between windings.
Can the transformer be matched to our inverter brand?
Yes. Share the inverter datasheet and plant single-line diagram and the transformer is specified to match.
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