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Customer Success Story

Express repairs to onboard traction transformers

Hitachi Energy help customers increase the reliability of on-board traction transformers while optimizing costs and life cycle.

In 2011, at Service center in Geneva, the option of quick repairs plus a thorough inspection turned out to be the ideal solution for repairing the traction transformers on the NTN trains of the Swiss National Rail Operator SBB, as well as the traction transformers fitted on private operator Südostbahn’s (SOB) Re456 locomotives.

SBB asked Geneva Service center to carry out an inspection and provide a detailed diagnostic assessment of the equipment. Noting a breakdown in the main coil with the entire transformer being contaminated by copper pearls, our service completely exchanged the winding of the active part and the two tractors coils. It was possible to re-use the magnetic core and the complete tank, cover and piping after cleaning.

The same year, SOB also required our expertise for one of the transformers on its Re456 locomotives. When installed, this type of traction transformer is subjected to significant vibrational stress. To avoid serious failures, we proposed and carried out preventive maintenance to dismantle the transformer’s active part of the transformer and replace all the dunnage in order to restabilize it.

The traction transformer is a crucial component in the traction chain, affecting train performance and operator services. But in case of a breakdown, quick solutions must arise to make it work again and prevent high operational costs. That is the reason why we have developed a strong customer orientation, offering service solutions ranging from diagnostics and preventive maintenance to upgrading, refitting and complete overhauls of equipment.

Main data
Offering Service
Traction transformers
EMU and locomotive
Power supply

AC / 15 kV 16.7 Hz      

Geographical location Europe
Year of commissioning 2011