Extended range current transducers
August 2014
Electrical Power & Protection
LEM has announced the addition of three new HO series high performance current transducers which extend nominal current measurement up to 250 A supported by a range of mounting options.
HO series current transducers measure DC, AC and pulsed signals using the latest generation of LEM’s Open-loop Hall-effect Application Specific Integrated Circuit (ASIC) which was introduced with the launch of the HO 8, 15, 25-NP and NSM series and the HO 6, 10 and 25-P models. The new series offer offset and gain drifts which are up to twice as accurate across the temperature range as the previous generation and have a faster response time of 2,5 to 3,5 μs.
Operating from a single supply voltage of 3,3 or 5 V, the HO series can measure up to x 2,5 the primary nominal current and includes an additional pin that provides over-current detection set at x 2,93 the nominal current. Fault reporting is also provided in the event of memory corruption.
LEM’s ASIC technology enables open loop transducer performance to approach that of closed loop transducers and will improve control and system efficiency at a significantly lower cost.
High clearance and creepage distances of more than 8 mm and a comparative tracking index of 600 mean that, despite the small package sizes, there is no compromise on the insulation level provided between the primary and measurement circuits.
The comprehensive range of options offered by HO transducers makes them suitable for a wide selection of applications where high performance and mounting flexibility are required. These applications include solar combiner boxes and solar power inverters, as well as small smart meters, variable speed drives, uninterruptible and switch-mode power supplies, air conditioning, home appliances, static converters for DC motor drives and robotics. The wide operating temperature range of -40 to 105°C also makes the HO series suitable for use in any industrial application. All devices are CE marked and conform to the EN 50178 standard.
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