Rogowski Coils: Flexible and Precise High-Current Sensors
Rogowski coils are toroidal air-core coils without an iron core and enable **contactless measurement of AC current**. They consist of a winding around a flexible core and are simply placed around the conductor – without interrupting the circuit.
Technical Advantages
- No core saturation – linear and precise even at very high currents (even at short-circuit currents) :contentReference[oaicite:0]{index=0}
- Excellent frequency response – ideal for fast current changes and harmonic measurements :contentReference[oaicite:1]{index=1}
- Flexible and space-saving – perfectly suited for retrofits or confined environments :contentReference[oaicite:2]{index=2}
- Low energy loss – significantly lower power compared to classic current transformers :contentReference[oaicite:3]{index=3}
- No danger with open secondary circuit – safe to handle :contentReference[oaicite:4]{index=4}
Operating Principle
A Rogowski coil generates a voltage proportional to the **rate of change of the current (di/dt)**. An integrator converts this signal into one proportional to the current magnitude :contentReference[oaicite:5]{index=5}.
Applications
- High-current and impulse sensing, e.g. in motors during startup or welding processes :contentReference[oaicite:6]{index=6}
- Energy and grid monitoring in buildings or industrial plants
- Protection systems, power measurement and condition monitoring
- Ideal for smart grid applications and energy management
Rogowski coils are highly flexible, robust and versatile – ideal for modern measurement tasks where precision, safety and easy installation are crucial.