Specialist capabilities
Rail transit power
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DC sub-station products

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.

DC sub-station products

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)

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.

Transformer Rectifier Units (TRUs)

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

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.

Traction rectifiers

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.



Open Circuit Arm Detector (OCAD)

The possibility of electrical interference causing railway electronic signaling systems malfunction has always existed. One source of interference, to which low frequency signaling systems are particularly prone, is as a result of imbalance in traction rectifier bridge electrical performance. Such an occurrence may not have an impact from an energy point of view. However the resultant electrical interference could cause signaling system failure.

Ultra’s OCAD product has the ability to tolerate such interference without generating spurious alarm signals. OCAD has a proven operational track record and is specified by many of its clients.

Open Circuit Arm Detector (OCAD)

The possibility of electrical interference causing railway electronic signaling systems malfunction has always existed. One source of interference, to which low frequency signaling systems are particularly prone, is as a result of imbalance in traction rectifier bridge electrical performance. Such an occurrence may not have an impact from an energy point of view. However the resultant electrical interference could cause signaling system failure.

Ultra’s OCAD product has the ability to tolerate such interference without generating spurious alarm signals. OCAD has a proven operational track record and is specified by many of its clients.



Auxiliary sub-station equipment

In addition to TRUs, Ultra also designs and manufactures a wide range of peripheral equipment such as control and protection panels, essential to the design of modern DC traction power sub-stations. Many products are designed specific to project requirements. These include drainage diode cubicles, mimic panels, earthing contactor cubicles, HV control and protection panels, marshalling boxes, pilot boxes, translay panels, transfer trip panels, depot battery chargers, voltage-controlled rectifiers/inverters and negative busbar systems.

Auxiliary sub-station equipment

In addition to TRUs, Ultra also designs and manufactures a wide range of peripheral equipment such as control and protection panels, essential to the design of modern DC traction power sub-stations. Many products are designed specific to project requirements. These include drainage diode cubicles, mimic panels, earthing contactor cubicles, HV control and protection panels, marshalling boxes, pilot boxes, translay panels, transfer trip panels, depot battery chargers, voltage-controlled rectifiers/inverters and negative busbar systems.



Modular buildings

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.

Modular buildings

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

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.

DC sub-station systems

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.



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