Rogowski Coil Current Transducers

Rogowski coils are used to measure AC current. The frequency range is from <1Hz to in excess of 1 MHz. The Rogowski coil is wrapped around the conductor to be measured. The sensors have an analogue voltage or current output that can be connected to a power analyser, data acquisition system or oscilloscope. Applications include power quality measurements, and testing of generators, motor drives and power supplies. Our Rogowski coil current transducers are available in various measurement ranges, with a range of coil and cable lengths, and in single and three phase specification. They can be used for test and measurement applications, or permanently installed to replace current transformers in industrial applications.

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Current probe 300mA to 300KA

Current transducer CWT

Ranges 300mA to 300,000A
Traceable calibration to +/-0.2%
Bandwidth 0.1 Hz to 16 MHz
Coil lengths 300-1000mm

Current Transducer 30A to 300kA

Current Transducer CWT Mini and Mini HF

Bandwidth to 30MHz
Peak-current ratings from 30A to 300kA
Peak di/dt capability up to 100kA/μs
4.5mm thick Rogowski coil

Miniature Current Transducer 30Apk to 6000Apk

Current transducer CWT Ultra Mini

Current ratings from 30Apk to 6000Apk
Extended (-3dB) bandwidth to 30MHz
Improved peak di/dt capabilities up to 70kA/μs
Coil length of 80mm

Current transducer dual range 60A to 60kA

Dual range AC current probe type LFR

Ratings from 60A up to 60.0 kA
Coil lengths from 300mm to 1000mm
Analogue output
Battery or external DC power supplied

Current transformer replacement 500A to 16000A

Current transducer RCT1A

Available rated current: 500A to 16000A
Full scale rate output: 1A RMS
Bandwidth (-3dB) 0.6Hz to 5kHz
Cable length: 1m or 2.5m

Current transducer 250A to 50000A

AC Current Transducer RCTi

Rated current (rms): 250A to 50000A
Full scale rated output: 5V rms
Bandwidth (-3dB) (<2000A): 0.6Hz to 1MHz
Cable Length: 1m or 2.5m

Current transducer 250A to 50kA

RCTi-3ph wide band current transducer

Rated current (rms): 250A to 50000A
Full scale rated output: 5V rms
Bandwidth: 0.6Hz to 1MHz
Cable Length: 1m or 2.5m

Current transducer true RMS 100A to 50kA

AC current transducer RCTrms

Rated current (rms): 100A to 50000A
Output: 4 to 20mA
Bandwidth: 2Hz to 100kHz
Cable Length: 1m or 2.5m

Current transducer 3 channel 100A to 50kA

3 channel AC current transducer RCTrms-3ph

Rated current (rms): 100A to 50000A
Output: 4 to 20mA or 0 to 5V output
Bandwidth (-3dB): 2Hz to 100kHz
Cable Length: 1m or 2.5m

What is a Rogowski coil current sensor?

In its simplest form a Rogowski coil is an evenly wound coil of N turns per metre on a non-magnetic former of constant cross sectional area A. The winding wire is returned to the starting point along the central axis of the former and the two ends are typically connected to a cable. The free end of the coil is normally inserted into a socket adjacent to the cable connection in a way that allows it to be unplugged thus enabling the coil to be looped around the conductor carrying the current to be measured.

An alternating or pulsed current in a conductor develops a magnetic field and the interaction of this magnetic field and the Rogowski coil local to the field gives rise to an induced voltage within the coil which is proportional to the rate of change of the current being measured. Provided the coil constitutes a closed loop with no discontinuities, it may be shown that the voltage E induced in the coil is proportional to the rate of change of the encircled current I according to the relationship E=H.dI/dt, where H, the coil sensitivity in (Vs/A), is proportional to NA.

To obtain an output voltage V_OUT proportional to I it is necessary to integrate the coil voltage E; hence an electronic integrator is used to provide a bandwidth extending down to below 1Hz.

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