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What we do

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

A versatile measuring system with many applications

Rogowski coil current transducers measure alternating currents in a frequency range from less than 0.1Hz to several hundreds of kHz. Their measurement range is impressive, ranging from a few milliamps to over 1 million amps.

A Rogowski coil is ‘linear’, it does not saturate and the mutual inductance between the coil and the conductor is independent of the current. Many of its useful features result from this linearity. It has a wide dynamic range so that the same coil can be used to measure both very small and very large currents.

Calibration is easier because the coil may be calibrated at any convenient current level and the calibration will be accurate for all currents including very large ones.

Coils can be built which are very compact and can be fitted in confined spaces, hence very useful for retro-fit applications.

We've made coils that are measured in millimetres and coils that fit around wind turbines, coils that measure lightning striking aircraft parts and coils that find the break in a railway line. The applications are many and varied.

Custom made with flexibility in mind

A project starts with a customer’s requirements to see what we can do to meet them. We try to understand what the customer is trying to achieve so that we can provide the best solution rather than supplying the nearest item 'off the shelf'. If we think a Rogowski coil is not suitable we will say so.

Our expertise can solve problems from measuring extremely large currents, providing a measuring coil to fit in a restricted space, or to meet certain environmental conditions. We can modify integrators and coils for any current required rather than only provide a standard product. We take for granted that customers can order any length of flexible coil, and any quantity, and they do.

Rack Mounted Integrator System for Multiple Measurements

Rack Mounted Integrator System for Multiple Measurements

We wrote the book...

David Ward has been developing solutions to measurement problems since the 1970’s. His early work within the Central Electricity Generating Board (CEGB) led to his interest in the Rogowski coil as a powerful technique for studying overheating problems in large generators. He designed a calibration system that makes best use of the coils. While recognising that a Rogowski coil is still unfamiliar to many engineers, he is trying to remove the mystery, readily documenting what he knows.

We wrote the book

Don't just take our word for it...

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