Rail transit power


Ultra is a leader in the design and supply of high-technology power conversion and control solutions to transit authorities around the world. Ultra offers sub-station equipment including Transformer Rectifier Units (TRU) and complete turnkey systems.

Rail transit power capabilities & products

DC sub-station products
DC sub-station products Image

At the forefront of new developments in power conversion, Ultra continues to offer new ideas and implement best practice to achieve unrivalled performance and value for money. Equipment has been supplied to many high-profile UK and overseas transit authorities. Ultra’s long experience in electrical and mechanical design is supported by the latest software design tools. Designs are simple, based on decades of refinement and are commercially competitive. Ultra is the UK’s leading supplier of transformer rectifier units (TRUs) and peripheral equipment for DC sub-stations.

Transformer Rectifier Units (TRUs)
Transformer Rectifier Units (TRUs) Image

Ultra has supplied TRUs to the traction markets for over 50 years. Units have been supplied to North America, Australia, the Philippines, Canada, Mexico, Greece and many other countries worldwide. More recently Ultra has supplied in excess of 600 TRUs to numerous main line, metro and tramway systems worldwide.

Whilst the majority of requirements tend to lie within similar parameters, Ultra designs its products to meet the client’s specific electrical and mechanical requirements. Ultra’s engineers are conversant with a wide range of national and international standards.

Ultra’s in-house engineering capability keeps it at the forefront of technology. Utilising these skills, Ultra provides its customers with highly reliable, efficient, proven, low-risk solutions.

Traction rectifiers
Traction rectifiers Image

Ultra’s new Kestrel range of traction rectifiers represents a standardised, modular design, low-cost solution, without compromise in quality or reliability. The environmentally-friendly Kestrel rectifiers, which are up to 40% smaller than equivalent-rated units, complement the bespoke range of traction power supply equipment manufactured by Ultra.

Modular buildings
Modular buildings Image

Ultra has been at the forefront in the use of portable modular steel housings for traction applications since 1986, when the Group received its first contract from British Rail. Since then, Ultra has won several major DC sub-station system contracts, from which it has gained extensive knowledge in this capability. Equipment fitted within the housings may include transformers, rectifiers, AC, DC & LV switchboards, SCADA, marshalling panels and other auxiliary equipment.

DC sub-station systems
DC sub-station systems Image

Ultra has supplied DC sub-stations to the rail industry since 1978. During this time, it has established an experienced design and project management team. Projects have been undertaken, both in the UK and overseas, on behalf of transit authorities, civil contractors, and major system suppliers, including Network Rail, Channel Tunnel Rail Link, Docklands Light Railway, London Underground and metro systems in Copenhagen, Manchester and Tyne & Wear.

The scope of supply typically includes system design, integration, and coordination, project management, equipment supply, delivery, installation and commissioning.