Current monitoring
Rogowski smart grid sensors for retrofit
The Rogowski principle is the core of our current monitoring solutions
Our current monitoring 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 current monitoring 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 based on the rate of change of the current input. The absence of magnetic core ensures low inductance and comes with no saturation, resulting with a fast response and no inserted losses.
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 ? 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 ? 125mm to 300mm
- UV, water, dust, and ice resistant for outdoor installations
- Bandwidth: 50/60 Hz
INTEGRATORS FOR ROGOWSKI COILS
- High accuracy Class 0.5 (IEC 61869-2)
- Combined with LEM ART & ARU 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
- Ambient operating temperature: -25 °C to +70 °C.
MORE ABOUT LEM’S CURRENT MONITORING SENSORS
What is a current monitoring sensor?
Current monitoring sensors are Rogowski based sensors and used for measuring alternating current (AC) or high-speed current. The induced voltage being proportional to the derivative current in the straight conductor, it is common to plug an integrator to the output of the current monitoring sensor as it will provide an output signal that is proportional to the current.
LEM is providing a complete range of Rogowski coil sensors (for both indoor and outdoor) and integrators.
5 advantages of LEM current monitoring solutions
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 coil sensors make a difference?
Rogowski current sensors are suitable for various applications, from outdoor or harsh environment for utilities to indoor and C&I environments.
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
- Theft detection