Electrical Power & Protection


Railway current and voltage transducers

November 2018 Electrical Power & Protection

Swiss manufacturer LEM has released its new traction catalogue describing railway current and voltage transducers. The new catalogue outlines the various technologies used by an isolated transducer design, namely open-loop ‘Hall’, closed-loop ‘Hall’ and closed-loop fluxgate. Voltage transducers are based on closed-loop ‘Hall’ or new isolated digital technology, offering higher specifications.

The company provides transducers suitable for on-board rolling stock, for example, main rectifier, main inverter or drive propulsion inverter, auxiliary inverter. Trackside substation transducers are also available for rectifiers, DC switch-gear as well as DC energy monitoring. Also catered for are interference frequency detection, main transformer saturation detection, fault detection and ground leakage. The traction transducers are also suitable for mining trucks, trolley buses, subway railways and points machine monitoring.

LEM transducers carry a five year warranty and comply with European standards and regulations:

• EN 50463-x (2012): Railway application, Energy measurement on board trains, DC measurement Class 2 and AC measurement Class 1.5.

• EN50155 (2007): Railway applications, Electronic equipment used on rolling stock.

• EN50121-3-2 (2006): Railway applications, Electromagnetic compatibility. Part 3-2: Rolling stock – Apparatus.

• EN 61373 (2010): Railway applications, Rolling stock equipment, shock and vibration tests.

• EN 50121-1 (2001): Railway applications, installation coordination. Part 1: Basic requirements.

• IEC 62056-21 (2002): Electricity metering, Data exchange for meter reading, tariff and load control. Part 21: Direct local data exchange.


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