LEM has announced the first package of components
specifically designed to enable rail-traction designers to meet the provisional
EN 50463 standard for onboard energy monitoring. Included in the announcement,
which comprises an energy meter with matched current and voltage transducers,
- A new, enhanced version of LEM's
EM4T energy meter, EM4T II, rated and certified to Class 0.5R accuracy.
- LEM's DV series voltage transducer,
that will be available with Class 1R or Class 0.75R certified accuracy
- Current transducers from LEM's ITC
family of products; an ITC 4000 and a combined ITC 2000 / 1000, certified
for Class 0.5R accuracy.
EM4T II is a single-phase energy meter that meets all current and proposed
standards for onboard rail-traction energy monitoring and, specifically,
complies with all of the requirements of the new prEN 50463. With the EM4T
II as the basis for tracking and logging energy consumption, designers can
provide the level of energy metering for billing purposes that are required for
locomotives that will operate across international borders and on multiple
electrical supply domains.
EM4T offers four input channels to accept measurements from any existing ac or dc
traction supply network. From voltage and current measurements, it calculates
active and reactive energy, compiles a load profile, and stores the values in
internal Flash memory; data points are recorded at selectable intervals ranging
from 1 to 60 minutes. Data points in the record are stamped with information
such as time and date, train identification, and the precise location of the
train at every interval: location is derived from a dedicated GPS input to the
EM4T II. Recording at 15-minute intervals, the EM4T II has sufficient internal
memory for more than 300 days' data. Optional, real-time data interfaces
also support exchange of data with other train systems, such as a driver
display. The EM4T II features immunity to the high levels of electrical noise
that are typical in the traction environment.
EM4T II offers bi-direction monitoring of energy flows and can correctly record
energy returned to the supply network during regenerative braking.