The Air-core principle is the core of our Rogowski Coil solutions
Our Rogowski Coil sensors are relying on the Rogowski technology. The specificity of that technology is that it is working without magnetic circuits. It is also known as “air-core”.
A Rogowski sensor is formed by an evenly wound coil on a non-magnetic core. The winding wire is returning to the starting point along the center of the coil.
A Rogowski coil produces a voltage output proportional to the current input. The absence of magnetic core ensures low inductance values and presents no saturation constraints.
ART Series
- Class accuracy 0.5 conductor centered according to IEC 61869-10
- Better than 0.75% accuracy regardless of the primary conductor’s position
- Rated insulation voltage 1kV CATIII
MAIN FEATURES
- 6.1 mm gauge with sensing apertures of Ø 70 to 300mm
- Bandwidth: 50/60 Hz, up to 700kHz in open circuit condition (no load)
- Operating range: -40°C to +80°C
ARU Series
- Class accuracy 0.5 conductor centered according to IEC 61869-10
- Better than 1% accuracy regardless of the primary conductor’s position
- Rated insulation voltage 1kV CATIII
MAIN FEATURES
- 10.4 mm gauge with sensing apertures of Ø 125mm to 300mm
- UV, water, dust, and ice resistant for outdoor installations
- Bandwidth: 50/60 Hz
ARH Series
- Class accuracy 0.5 according to IEC 61869-10
- Can be installed in contact with the busbar without additional accessories
- Fast and easy installation with no need to dismount the busbars
MAIN FEATURES
- Extended temperature range: up to 105 °C operating temperature and 125 °C in direct contact with busbar
- ⌀ 70 mm sensing aperture
- 22.5 mV/kA sensitivity to have a very thin coil.
INTEGRATORS FOR ROGOWSKI COILS
- High accuracy Class 0.5 (IEC 61869-2)
- Combined with LEM ART, ARU & ARH class 0.5 Rogowski coils, they offer a universal metering and monitoring solution easily integrated with a monitoring device.
- DIN rail mounted.
MAIN FEATURES
- 12 selectable ranges from 100 to 5000 A
- 6 selectable sensitivities depending on Rogowski coil from 22.5 to 120 mV/kA
- Environmental operating temperature: -25 °C to +70 °C.
MORE ABOUT LEM’S ROGOWSKI COIL CURRENT SENSORS
What is a Rogowski Coil?
Rogowski Coil sensors are sensors based on the so-called "Rogowski" technology and used to measure alternate current (AC). The induced voltage is proportional to the derivative current in the primary conductor, so it is common to install an integrator after the output of the sensor as it will provide an output signal proportional to the current.
LEM provides a complete range of Rogowski sensors (for both indoor and outdoor installations) and integrators.
5 advantages of LEM Rogowski Current Sensor
Rogowski sensors’ absence of magnetic circuit offer several advantages:
- Reduced cost
- Coil can be opened and is flexible, it can be wrapped easily around a live conductor.
- No saturation, resulting in high linearity.
- Low inductance, allowing for fast responses to changing currents.
- No inserted losses
On which applications can Rogowski coils make a difference?
Rogowski current sensors are suitable for many applications, from outdoor or harsh environment for utilities to indoor and buildings.
In these areas, they are especially designed for:
- Current monitoring for all typical applications (current demand, Energy efficiency, monitoring for grid or Industrial & commercial applications …)
- Demand power flow monitoring
- Fault detection