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Rogowski coil technology provides solutions for today's and tomorrow's current measuring problems.

Rocoil Limited UK is a small company that specialises in the development, design and manufacture of current transducers for use in situations that have difficult and exacting requirements.

The transducers use air-cored coils to detect the current and integrators to achieve the sensitivity and frequency response required. The coils are commonly referred to as Rogowski coils.

The properties of the Rogowski coils and integrators can be utilised to achieve solutions to a wide range of current measurement problems. These properties are:

Flexibility, Weight and Size

Transducers from a few millimetres diameter to several metres have been produced to measure currents inside and around engineering structures. These can be made on flexible and rigid formers and because the formers are non magnetic they are light weight.

Current and Frequency Range

Currents from a few milliamps to mega amps can be measured covering a frequency range of a fraction of a hertz (transient dc offsets) to about 1MHz in some cases.

Accuracy and Linearity

Accuracies better than the best current transformers can be produced and because they are air-cored this accuracy is maintained over the entire working range. Low temperature coefficients can be achieved by matching the coils to the integrators. Also with careful design of the winding layout the pickup from external magnetic fields and nearby other currents can be controlled.

What we do

Our aim is to promote the use of Rogowski coils. We appreciate that this technology can be new, even to experienced electrical engineers, and we work closely with our customers to try to understand their specific current-measurement applications to provide the best solution. We have developed a wide range of products and techniques to cope with different current measurement situations and our detailed knowledge of the Rogowski coil means we can easily modify these for special requirements. All of our products are made to order and tailored for each of our customers’ needs, in a diverse number of industries. We have manufacturing capability from developing prototypes to large production runs.

Well, your coils have helped us so much already that we need more. I would like to order a second identical system comprised of 3 coils plus a four range / three channel integrator.

Arc lamp manufacturer | Canada

All of the coils you provided for our program over the past couple of years worked perfectly as desired. In the end, that program was a major success and the spin-offs are still on-going.

Power research industry | USA

I just thought I’d say hello and give you an update on the coils and integrators you built for us a short while ago. So far they have been working extremely well and we are very pleased with them. We’ve tested the sample Rogowskis right down to 200A and still get good signal levels. We’ve also not seen any ringing so far, though we still have some integrator-coil combinations to explore. All in all it is a very good system and is very immune to noise. Many thanks to you and your colleagues for putting it together for us.

Energy research and development industry | UK

We want to say thank you for the integrator and the coils. Your hardware does an excellent job so far. We are very happy! We are looking forward to an upgrade of your system later this year.

University | Germany

I can’t thank you enough for taking care of this! We really appreciate your effort and diligence to get this out the door! I wish I had more suppliers like you.

Fishing industry | USA

Many thanks for the information. We have received the coil and integrator, it is working perfectly, and I have been meaning to thank you and your team for all of your kind assistance. One of our bachelors project students is using the coil and integrator now, and after that it will either be used by future project students or by the power systems teaching lab.

Robert Brown | Doctoral Researcher | London South Bank University

Some of our clients