Art - passive Rogowski coils with very high accuracy

Flexible Rogowski Coil with Split Core Dedicated for AC Measurements Requiring Galvanic Isolation Between the High-Current Circuit and the Measurement System.

The use of the patented Perfekt Loop technology has significantly reduced measurement errors caused by the position of the primary conductor within the instrument loop, as well as errors resulting from external magnetic fields.

Main Features

• Accuracy class 0.5 according to IEC 61869 regardless of the primary conductor's position within the loop
• Rated insulation voltage 1kV CAT III PD2
• Protection degree IP67
• From 10 to 10000A RMS
• Thin, lightweight, flexible coil with split core, easy to install anywhere
• Perfekt Loop technology ensures accurate coil closure
• Almost ideal linearity, no saturation, no upper current range limits
• Internal shielding facilitating low-current measurements
• Output voltage proportional to the rate of change (derivative) of the primary current (requires an electronic integrator): 22.5mV/kA at 50Hz

Device Specifications

• Core Ø 6.1mm and primary conductor Ø 70, Ø 125, Ø 175, Ø 300mm
• Weight from 124g
• Output cable 1.5m (other lengths available on request)
• Frequency range from 50/60Hz up to 700kHz for unloaded operation
• Operating temperature -40°C...+80°C

Standards Compliance

• CE EMC 2014/30/EU certified, allowing use in the European Union according to directive 2014/35/EU and tested for compliance with IEC 61010-1.
• IEC 61869 regarding current transformer requirements
• UL 2808 (in progress)

Application Examples

• Medium/low voltage transformer stations on the low-voltage side: transformer condition monitoring
• Electric energy consumption measurement systems
• Power quality monitoring systems
• Fault and short-circuit detection systems
• Remote measurement systems

Notes

• Install only when the secondary conductor is connected
• The device is excellent as part of power consumption measurement systems requiring accuracy class 1
• The primary conductor should be secured to the device at the hole height using a cable tie
• The device is equipped with a Ø 2mm hole allowing it to be secured against unauthorized core opening

Designation

Device Dimensions and Schematic

What is a Rogowski Coil?

A Rogowski coil is a modern measurement transducer that allows the measurement of alternating current in a conductor without direct electrical contact with the circuit. Unlike traditional current transformers, Rogowski coils operate by inducing voltage in a flexible air-core coil placed around the conductor through which current flows.

When current flows through the conductor, the magnetic field generated by the current induces a voltage signal in the coil proportional to the rate of change of the current, meaning the output signal from the Rogowski coil is proportional to the derivative of the AC current. To obtain the current value, this signal must be integrated in an integrating circuit or a converter cooperating with a current measurement system.

Rogowski coils can measure currents in a conductor from very low currents up to hundreds of kA, and their construction makes them resistant to external magnetic fields, hysteresis, and voltage drop. The resulting current or voltage signal is proportional to the measured current, and the phase shift is only 90°, allowing accurate AC component measurements and noise elimination.

A Rogowski coil consists of a toroidal winding, which unlike traditional magnetic cores, does not saturate, allowing precise current measurements across a wide range of values. They can work with portable instruments, automation systems, or energy monitoring systems, making them suitable for industrial and energy applications, including accurate AC component and ripple current measurements.

Main Practical Advantages:

• Capable of measuring currents from very low to very high values.
• Minimal influence from external magnetic fields and no saturation.
• High measurement accuracy and signal proportionality to the measured current.
• Easy installation due to split core, without disconnecting the conductor.
• Ideal for phase current, DC, and AC measurement systems requiring high accuracy and operator safety.

In short, ART-B22 Rogowski coils are reliable and flexible current sensors that induce a voltage in response to conductor current, providing accurate AC measurements and full control over the measurement system—from remote metering systems to advanced industrial automation systems.