Flexible Rogoski Coil – High-Accuracy AC Current Measurement

The Rogoski coil, invented by German physicist Hermann Rogowski in 1912, is a high-performance, flexible current sensor designed for the non-intrusive measurement of AC current. It operates on the principle of magnetic field induction and is widely used for monitoring high-frequency, transient, and irregular current waveforms in electrical systems.

At eGauge.co.za, we offer premium-quality Rogoski coils tailored for energy professionals, engineers, and technicians seeking reliable and accurate current measurement solutions.

What is a Rogoski Coil?

A Rogoski coil is built from a helical winding wrapped around a non-magnetic core. When placed around a conductor carrying AC current, it detects the magnetic field produced and generates a voltage signal proportional to the rate of change of current. This signal is integrated to recreate the exact waveform of the measured current.

Compared to traditional current transformers, Rogoski coils offer:

• Flexibility

• Non-intrusive installation

• High bandwidth and accuracy

• Lightweight and safe operation

Applications of Flexible Rogoski Coils

Rogoski coils are ideal for scenarios where space, safety, or frequency range presents challenges for standard sensors. Typical applications include:

• Power Quality Monitoring – Track harmonics, transients, voltage dips and swells.

• Energy Management Systems – Enable precise, real-time monitoring of power usage.

• Electrical Testing & Fault Diagnosis – Perform equipment analysis and load studies.

• Billing and Load Balancing – Use in power metering for energy audits and efficiency assessments.

• Industrial & Utility Systems – Measure large or irregular waveforms in environments like electric furnaces or renewable installations.

You’ll find a wide selection of flexible current sensors at eGauge.co.za to suit all of the above applications.

Key Features

• Flexible Design – Wraps easily around cables or conductors of varying sizes, perfect for tight or complex setups.

• Non-Intrusive – No disconnection or direct contact with live circuits required.

• Wide Frequency Range – Measures signals from 10Hz to 10MHz, ideal for harmonics and fast transients.

• High Accuracy – Class 1.0 with excellent linearity (±0.1%) for dependable readings.

• Safe & Robust – No risk from open-circuiting or overload damage, suitable for high-current environments.

• Compact & Lightweight – Easy to transport and install, even in confined electrical cabinets.

FRC Series Rogoski Coils – Technical Specifications

Available now at eGauge.co.za, the FRC series offers a variety of coil lengths and outputs:

Electrical Characteristics

• Accuracy: Class 1.0 (with amplifier calibration)

• Linearity: ±0.1% from 10% to 100% of scale

• Bandwidth: Approx. 10Hz to 10MHz

• Phase Shift: 90°

• Position Sensitivity: ±2% max

• External Field Sensitivity: ±2% max

• Rated Voltage: 1000V RMS (CAT III), 600V RMS (CAT IV)

• Dielectric Strength: 7400V RMS @ 50/60Hz for 1 minute

Mechanical Details

• Coil Cross Section: 6.5 ± 0.2 mm

• Closure: Bayonet holder

• Material: Flame-retardant thermoplastic (UL94-V0)

• Cable Options: 3000 mm standard, BNC or 3-wire terminal

• Colours: Black (standard), Red, Yellow, Blue (custom options available)

Why Choose eGauge.co.za for Your Rogoski Coil Needs?

At eGauge.co.za, we specialise in supplying high-quality Rogoski coils and energy monitoring solutions across South Africa. Whether you're upgrading your monitoring system or integrating current sensors into a new installation, we provide expert advice, reliable products, and fast delivery.

Explore our full range of flexible current sensors and accessories today at eGauge.co.za.