Active Current transformers

Current transducers with low space requirements combined with outstanding performance

REO current transformers distinguish themselves in particular due to the low space requirements, excellent linearity and short response times. The new Hall Effect current sensors can depict different types of current types. (AC/DC/Impulse)

The current transformer series are available in a range up to 150 kHz and, as a result of the testing that has previously been performed and is carried out in the manufacturing process, whether that is vacuum casting, partial discharge measurement or high-voltage testing, achieve a high level of reliability and are perfectly adapted to the respective place of use. Standard provision: DIN EN 50178

  • Series WDI

    AC/DC Open loop current transformers

    Series WDI
    • Primary rated current: 25 - 500 A
    • Frequency range: 10000 Hz

    The WDI current sensor is an open loop current transformer designed for measuring direct and alternating currents.


    The primary current generates a magnetic flux and this is evaluated by means of a magnetic circuit and Hall sensor in the air gap. The signal from the Hall sensor is processed by an electronic circuit and an exact representation of the primary current is output as a voltage.



    • According to: EN50178

    • Tracking resistance: 550/600M

    • Frequency range: (-3 dB) DC...10



    Applications



    • Industry

    • Renewable energy 

    • Railway engineering

    • Energy, automation and building technology



  • Series WKO

    Closed loop current transformers

    Series WKO
    • Primary rated current: 25 - 2000 A
    • Frequency range: 100000 - 200000 Hz

    WKO current sensors work in accordance with the proven compensation principle and are suitable for measuring direct, alternating and mixed currents.


    The primary current generates a magnetic flux, which is compensated by an internal secondary coil. The current is evaluated by an electronic circuit and a Hall sensor. The secondary compensating current is a precise representation of the primary current to be measured. 


    According to: 



    • EN50178

    • EN50121, EN55011

    • IEC61869-1, IEC61869-8, IEC61010-1 

    • UL94-V0 – UL Norm: all parts are UL-listed


    Applications



    • Power Electronics : AC DC motor control , inverter technology , drive control

    • Railway Technology: drive control

    • Renewable energy : wind turbines control, monitoring


     


    General technical data:



    • Accuracy: better than 1%

    • Ambient temperature:  -25°C … +70°C

    • Storage temperature: -25°C … +85°C

  • Series WKO-2C

    Double core technology closed-loop current transformers

    Series WKO-2C
    • Primary rated current: 500 - 2000 A
    • Messbereich: 0...3000 A
    • Frequency range: 120000 Hz

    REO has developed new generation of closed loop (C/L) current transducers which guarantees increased current measurement accuracy better than 0.3% in the whole frequency range: DC to 140 kHz.


    The new current transducer type WKO-2C is a completely new development utilizing REO’s double core technology magnetic design. The unit uses the latest hall effect elements with an extended frequency response up to 120 kHz and accurate phase response.


    Completely redesigned electronics ensures that the new C/L current transducer has better drift compensation and an extended temperature range from -40°C to 85°C.



    • According to: EN 50178:1997, UL 94-V0

    • Frequency range: (-3 dB) DC...140 kHz



    Typical applications



    • Variable speed control of 3-phase AC-motor and servo motor drives

    • Industrial inverters

    • Uninterruptable power supplies

    • All types of switched mode power supplies

    • Power supplies for welding applications



  • Series WKO-2C-B

    Double core technology closed-loop current transformers for railway engineering

    Series WKO-2C-B
    • Primary rated current: 500 - 2000 A
    • Messbereich: 0...3000 A
    • Frequency range: 120000 Hz

    The current transducer WKO-2C-B with hall effect elements and double-core  technology has an extended frequency response up to 140 kHz and an accurate phase response. The WKO-2C-B guarantees an increased current measurement accuracy better than 0.3% in the whole frequency range: DC to 140 kHz.


    A completely redesigned electronics ensures that the new C/L current transducer has better drift compensation and an extended temperature range from -40°C to 85°C.


    Modular design


    The current transformer has a modular design which allows a variety of mounting options. The cost-effective basic model consists of a housing with screw terminals, bushing for cable and holes for fixing. Optionally, the transducers are available with mounting kit for busbars, molex connectors and feets for horizontal or vertical mounting.


    According to: 



    • EN 50178:1997

    • UL 94-V0

    • EN 50178            

    • EN 50155:2007

    • IEC 61373:2010


    Typical applications



    • Railway engineering

Downloads