AiVibeRogowski Coil
A Rogowski coil is an air-cored, often flexible current sensor wrapped around a conductor that outputs a voltage proportional to the rate of change of current, which an integrator converts into a signal proportional to the alternating current.
The coil is wound on a non-magnetic former, with its ends brought close together so that it encircles the conductor. Because it has no iron core, it does not saturate, responds linearly over a very wide current range and has a wide bandwidth. Its output voltage is proportional to the derivative of the current, so an analogue or digital integrator reconstructs the current waveform, and many sensors include the integrator in the cable or measuring device.
Rogowski coils suit large conductors, busbars and confined spaces where rigid CTs cannot fit, and their flexibility makes temporary and retrofit measurements quick. They are used in power quality analysers, energy monitoring of large loads, harmonic and transient measurement and protection applications. Their light weight and non-saturating behaviour suit high and fast-changing currents.
Rogowski coils measure alternating and transient current but not direct current. Their low output signal needs careful integration and shielding, and accuracy depends on the position of the conductor within the loop and on calibration of the coil and integrator together. Installation around live conductors carries electrical hazards, so it must follow the manufacturer's documentation and be carried out by qualified electrical personnel with appropriate protective equipment.
Key points
- Air-cored coil that does not saturate
- Output is proportional to the rate of change of current
- Requires an integrator to reproduce the current waveform
- Flexible designs fit around large conductors and busbars
- Measures AC and transients but not DC
Where AiVibe comes in
AiAmbA IoT is AiVibe's edge protocol layer: it discovers devices and normalises industrial signals, with supported protocols including Siemens S7, Mitsubishi MC, Delta Modbus, OPC UA and MQTT, and driver availability confirmed per installation. Writes to machines are deny-by-default.