FRIEM

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Founded in 1950 to design and manufacture power converters for electrochemical applications, in 1974 FRIEM started producing rectifier units for railway, metro and tram lines.

FRIEM is able to provide complete power conversion systems, including MV switchgears, special transformers, power converters, high-current DC isolators, and power-factor improvement and harmonic filter systems.

Thanks to continual investment in research and development, FRIEM is a world leader in the design and manufacture of high-power converters (diodes, thyristors or IGBTs) equipped with the most advanced digital regulations and protections.

FRIEM's traction rectifiers fully comply with IEC or ANSI/IEEE standards and the most stringent standards for heavy traction service.

FRIEM designs compact and modern rectifiers that provide an extremely high level of efficiency and reliability. The service continuity required by the rectifiers for traction applications led FRIEM to focus on the "redundancy" of main components, considering the application of semiconductors’ N-1 design as standard.

In accordance with the request for easy-maintenance traction rectifiers, FRIEM has developed a complete line of rectifier units with a fully withdrawable power section.

The standardisation of PLCs in FRIEM's design has made protection and control equipment extremely flexible and capable of being installed locally, in a separate section of the rectifier cubicle, or remotely.

Our traction rectifiers meet all necessary safety standards: all materials inside the rectifier are flameproof and do not emit dangerous gases in the case of fire.

FRIEM's unique design for its traction rectifiers’ power sections (involving semiconductors’ heat-sink and current conductors), means our rectifiers offer:

Traction rectifier operating characteristics

The operating characteristics of our traction rectifiers are as follows:

The design characteristics of our traction rectifiers are as below:

Thanks to its team of specialised technicians and a network of local service concessionaries, FRIEM can provide technical support for assistance, installation, commissioning and start-up all over the world.

When assistance is required, an immediate remote analysis of the problem often leads to an extremely fast and effective solution. Furthermore a quick and reliable on-site intervention can be guaranteed within 24 hours if there is an emergency.