MVA (Megavolt-Ampere) — Transformer Glossary

Unit of apparent power equal to 1,000 kVA or 1,000,000 VA. Used to rate power transformers.

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MVA (Megavolt-Ampere)

Unit of apparent power equal to 1,000 kVA or 1,000,000 VA. Used to rate power transformers.

Power transformers are rated in MVA to reflect the scale of electrical power they handle. A 100 MVA transformer can handle 100 million volt-amperes of apparent power. In the ETS product range, distribution transformers are rated up to 5 MVA, while power transformers span 6 MVA to 200 MVA. The MVA rating determines the physical size, weight, cooling requirements, and cost of the transformer. Dual-rated transformers (e.g., 80/100 MVA ONAN/ONAF) can deliver higher capacity when forced cooling is activated.

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Where this term matters in the ETS portfolio.

transformersEHV Power TransformersExtra high voltage power transformers for transmission grids, generation step-up, and interconnection applications at 220–400 kV.

transformersUHV Power TransformersUltra high voltage power transformers for 400–765 kV transmission-class applications, leveraging global JV partnerships for units up to 500 MVA.

transformersMedium Power TransformersMedium power transformers for sub-transmission, industrial, and generation applications.

transformersSolar PV Application TransformersSpecialised transformers for photovoltaic power plants and inverter stations.

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Power Factor (PF)The ratio of real power (kW) to apparent power (kVA) in an AC circuit. Ranges from 0 to 1, where 1 represents a purely resistive load.

ONAN (Oil Natural Air Natural)Cooling method where oil circulates by natural convection and heat is dissipated to air through radiators without fans or pumps.