Earth Leakage sensing / Ground Fault Indication
Based on the Flexible Sense Coil RCTi 3ph three phase current sensors
Fast & easy installation even when 3ph cables are spread over a large area or in confined spaces
Eliminate LV/MV/HV shutdown

The RCTi-Earth Leakage Sensors (RCTi-EL) are used to detect when current is leaking to ground.  Two RCTi solutions are available; a single coil encircling all conductors or 3 separate coils (where summation takes place in the signal conditioner)

To NEC 230-95(c) Earth Leakage sensing applications usually rely on one Core Balance en-circling the phases and neutral.   If no Earth Leakage is present, perfect cancellation takes place within the core balance current transformer.   Often it is physically impossible to fit one current transformer around all conductors, often cables are spread out or the space is confined - the RCTi-EL provide a quick and easy solution to this.

 The RCTi-EL sensors convert ac current to an isolated 0-5V voltage, 4-20mA current loop.  Optional 1A outputs ensure compatibility with existing CT metering circuits.   The available RCT ranges are 0-25A to 0-50,000Apk.  The RCTi provide accurate detection with a wide variety of waveshapes ensuring accurate representation of the earth leakage current.

The RCTi-EL  sensor can provide all popular process control voltage and current loop outputs along with custom output options.   The RCTi-EL range are split core sensors which means that connection is possible without shutting down an operating feeder or incomer.   Typical applications are power distribution in large shops, offices and factories, where KVA power levels are high.  For all RCTi-EL models, a NIST/NPL (UKAS) traceable calibration certificate and certificate of conformance is supplied.   All RCT sensors use UL or CSA approved materials.

RCTi-EL series, flexible split core Earth Leakage
Ground Fault current sensors

              
     RCTi-EL single phase                                         RCTi -3ph-EL three coil  

          
       Includes signal conditioner and power                TA5V-xA 1A or 5A adapter                       

Get pdf data sheets:       RCTi single phase      RCTi-3ph Three Phase

The RCTi-EL, RCTi-3ph-EL and RCTrms-EL are ideal for retrofit replacement for medium/large current, split core current transformers operating with transducers.  Excellent performance at power frequencies 1Hz to 1MHz, also ideal for VFD drives and induction heating.  The RCTi-EL and RCTrms current sensor/transducers are suited to permanent or semi permanent installation. The coil sensor is durable, thin, lightweight, flexible and will easily clip-around the conductor. The output from the transducer can be ac voltage (RCTi, RCTi-3ph) or a true rms output (RCTrms).  Typically the RCTi is used with data loggers, oscilloscopes, data acquisition cards, power analyzers, harmonic analysis and in power quality applications.  The RCTrms is used in process control Scada Systems and industrial power applications, where a dc output represents the rms ac current.


RCTi-EL & RCTi-3ph-EL Models

Model TA5V-1A output module


Model TA5V-5A output module

RCTi specification summary

-- Available as single or three phase
-- Available sense coil lengths 300, 500 or 700mm
-- Optional mini coils, 3.5mm thickness, 100, 200 or 300mm length
-- Isolated measurement output
-- 0-5V (7.07pk ) into 1kohm or 4-20mA outputs
-- 2kV insulation continuous (tested 4kV) / 10kV optional (tested 15kV)
-- <1% accuracy from 5%-150% of range
-- Bandwidth 0.6Hz to 1MHz
-- Operation to 150% FS 10.6Vpk
-- 12, 24, 48, 125Vdc or 110Vac, 220Vac power supply options, see *
-- Operating range -5°C to +65°C
-- Safety EN61010:2001
-- CE marked

<<< PDF data sheets available on request >>>
 

RCTi-EL & RCTi-3ph-EL Earth Leakage Current sensor order codes

RCTi-EL / 1x / power supply / coil length mm
25A range, 0-5V output with 24Vdc power and 300mm coil length = RCTi-EL/ 1x / D24 / 300

RCTi-EL-3ph / 1x / power supply / coil length mm
25A range, 0-5V output with 24Vdc power and 500mm coil length
= RCTi-3ph-EL / 1x / D24 / 500

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Optional 3.5mm diameter 100, 200 or 300mm sense coils

* to meet CE / UL safety requirements, an external power adapter is supplied for 125Vdc, 110Vac and 230Vac options