Power Generation
Generation companies buy transformers for a service life measured in decades, inside a project where the critical path is usually civil and mechanical work — and where a transformer arriving late costs more than the transformer. We supply transformer solutions for power generation with that reality built into how we quote and schedule.
We work with independent power producers, state generating companies, captive industrial generators and the EPC contractors building their plants.
What Generation Customers Require
Three concerns come up on every project:
| Requirement | What it means in practice |
|---|---|
| Reliability | Forced outage costs more per day than the transformer cost to build |
| Loss performance | Base-load plants carry load losses every hour of every year |
| Delivery certainty | Energisation is tied to a commissioning window booked months ahead |
| Grid compliance | Ratio, impedance and tap range dictated by the interconnection agreement |
| Documentation | Civil and electrical design teams need drawings before manufacture can proceed |
The second one drives the most design decisions. A base-load thermal plant cares about load loss because the unit is near full output continuously. A peaking gas plant cares about thermal cycling capability because the unit may start and stop several times a week.
Generation Types We Support
- Thermal and coal-fired plants — continuous base-load duty where load losses dominate lifetime cost.
- Biomass and waste-to-energy — usually smaller ratings, with corrosive or dusty atmospheres affecting enclosures.
- Hydroelectric — often underground or in humid powerhouses, with specific flooding and access constraints.
- Open-cycle and combined-cycle gas — fast starts and frequent cycling, making load-following capability critical.
- Captive and industrial generation — where the transformer serves both plant load and export.
- Renewable generation — covered separately under solar, wind and renewable energy.
Generator Step-Up Units
The step-up transformer is the single largest electrical asset on most plant sites and almost always has the longest lead time. It is specified from the generator outwards — machine MVA, power factor and terminal voltage first, then high-voltage winding and interconnection.
Because delivery is often critical-path, settle these early: rating and cooling class, voltage ratio and tapping arrangement, vector group and its interaction with the protection scheme, impedance from the system study, and transport limitations to the site. Our generator step-up transformer guide walks through each decision with real numbers.
Auxiliary, Unit and Station Service Transformers
These get specified late, which is a mistake, because they cause more commissioning problems than the main step-up unit. Auxiliary transformers are switched frequently, energised when the grid is weakest, and expected to survive voltage dips from large motor starting.
The two things to specify explicitly: enough tap range to hold secondary voltage across the full grid swing, and inrush performance compatible with the protection settings so that black-start sequences do not trip out on energisation. Where units sit indoors near the turbine hall, fire rules usually mean dry-type construction.
Our Solutions
We supply generator step-up units from our power transformer range, auxiliary and station service units from the oil-immersed and dry-type ranges, plant distribution through compact substations, and the associated switchgear and control. Where the project benefits from one responsible supplier, we coordinate the package against a single programme.
Our quality control process and testing facility pages set out how quality is managed and what each unit is subjected to before dispatch.
Loss Optimisation Across the Plant Life
A generating transformer’s loss cost over thirty years usually exceeds its purchase price by a wide margin, yet loss figures are frequently accepted from a catalogue without challenge. Whether that matters depends entirely on how the plant runs.
A base-load unit carrying eighty or ninety per cent load continuously accumulates load loss (copper loss) for every hour of every year, so reducing winding loss pays back quickly. A peaking unit idle for much of the year accumulates almost nothing in load loss but carries no-load loss (core loss) twenty-four hours a day regardless of whether it is generating — so core design matters more there.
That distinction means the optimum design differs by plant type, and a single “high efficiency” specification applied across an entire fleet will misdirect money. Where the enquiry tells us the expected capacity factor and dispatch pattern, we can quote two options — core-optimised and load-optimised — and let the numbers decide.
Frequently Asked Questions
Can you work to turbine-driven interface requirements? Yes. Send the generator nameplate data and we will confirm rating, vector group and impedance before quoting.
Do you handle black-start auxiliary duties? Yes — inrush performance and motor-start voltage dip need specifying at design stage.
Can you meet plant commissioning dates? Give us the energisation date with the enquiry and we will build the design approval, procurement and test programme around it.
Which standards? IEC 60076 as standard, IEEE C57 where the project specifies it, stated explicitly for each project.