Three-phase current measurement

November 2009 Maintenance, Test & Measurement, Calibration

LEM introduces triple current measurement in single housing.

LEM has introduced the HTT series of PCB-mounting current transducers to provide the facility to measure three currents with a single PCB-mounted unit. The new transducers, with maximum measurement currents ranging from 25 to 150 A(RMS), allow three-phase currents to be monitored independently by a compact unit with a height of only 29 mm.

The HTT transducers have three 12 x 10 mm apertures for the primary conductors and are securely mounted by four metallic pins, which are soldered to the PCB. Secondary connections for power supply, 0 V and the three voltage outputs are also made to the PCB by pins.

Five different models using the same housing are available to cover nominal current measurements of 3 x 25, 50, 75, 100 or 150 A, working from a bipolar power supply of ±12 to 15 V. The use of open-loop Hall-effect technology allows DC, AC or pulse currents to be measured and provides galvanic isolation between the primary and output circuits, withstanding a test isolation voltage of 2,5 kV/ 50 Hz/1 min. The transducers conform to the EN 50178 standard and are CE marked according to European Directive 2004/108/EEC. They are particularly suitable for industrial applications and home appliances, such as variable speed drives, UPS, SMPS and airconditioners.

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