LEM's Energy Meter/Transducer Combination

LEM has announced the first package of componentsspecifically designed to enable rail-traction designers to meet the provisionalEN 50463 standard for onboard energy monitoring. Included in the announcement,which comprises an energy meter with matched current and voltage transducers,are:

LEM'sEM4T II is a single-phase energy meter that meets all current and proposedstandards for onboard rail-traction energy monitoring and, specifically,complies with all of the requirements of the new prEN 50463. With the EM4TII as the basis for tracking and logging energy consumption, designers canprovide the level of energy metering for billing purposes that are required forlocomotives that will operate across international borders and on multipleelectrical supply domains.

TheEM4T offers four input channels to accept measurements from any existing ac or dctraction supply network. From voltage and current measurements, it calculatesactive and reactive energy, compiles a load profile, and stores the values ininternal Flash memory; data points are recorded at selectable intervals rangingfrom 1 to 60 minutes. Data points in the record are stamped with informationsuch as time and date, train identification, and the precise location of thetrain at every interval: location is derived from a dedicated GPS input to theEM4T II. Recording at 15-minute intervals, the EM4T II has sufficient internalmemory for more than 300 days' data. Optional, real-time data interfacesalso support exchange of data with other train systems, such as a driverdisplay. The EM4T II features immunity to the high levels of electrical noisethat are typical in the traction environment.

TheEM4T II offers bi-direction monitoring of energy flows and can correctly recordenergy returned to the supply network during regenerative braking.