A Rogowski coil is a specialized device for measuring alternating current (AC). Unlike traditional current transformers with an iron core, it uses a helical (spiral) coil of wire, often wrapped around a flexible core, forming a loop.
How Does It Work?
The coil is placed around the current-carrying conductor. The changing magnetic field from the AC current induces a voltage in the coil. This induced voltage is proportional to the rate of change of the primary current. Since the output is a voltage proportional to the derivative of the current, it requires an electronic integrator to convert the signal back into a waveform that accurately represents the original current.
Product Features
1. Flexible and Non-Rigid: Its open-ended, flexible design allows it to be easily wrapped around conductors of irregular shapes or in tight spaces, simplifying installation.
2. No Saturation: Without an iron core, it cannot saturate. This makes it ideal for measuring very high currents, including fault currents and complex waveforms with high peaks.
3. Linearity and Wide Bandwidth: It offers excellent linearity over a very wide frequency range, making it suitable for measuring high-frequency currents and analyzing power quality.
Common Applications
Rogowski coils are ideal for modern electrical applications:
1. Power Quality Analysis: Measuring harmonic distortions and transient currents.
2. Energy Management Systems: Monitoring load currents in complex installations.
3. Protection and Fault Detection: Capturing high-magnitude fault currents without damage.
4. Arc Flash Detection: Their fast response is used to trigger safety systems.
