A single device could enable us to find out which parts of our homes are the most energy-hungry without installing plug-in power monitors on each individual appliance, thanks to a new technology for monitoring home electricity use developed by engineers at the University of Southampton.

Dr Reuben Wilcock, Enterprise Fellow at the University, and PhD student Robert Rudolf now have the opportunity to take their multi-core current clamp to market as joint winners of this year’s Royal Academy of Engineering ERA Foundation Entrepreneurs Award. The Award was established by the ERA to identify entrepreneurial researchers in UK universities, working in electro-technology and at an early stage of their careers, and to enable them to commercialise their research. The ERA Foundation established the award to identify entrepreneurial researchers, working in UK universities, in the field of electro-technology, who are at an early stage in their career. Dr Wilcock and Mr Rudolf will receive the award at the Academy’s Awards Dinner in London on 17 July, together with Dr Julien Reboud of the University of Glasgow, who has also won an ERA Foundation award for his work on diagnostic kits for infection.

There is a huge market for measuring energy use in the home, and this is set to increase as we move towards greater use of smart meters. All home energy management systems rely on power measurement, usually by a single core current clamp sensor on the incoming live wire. However, this only gives the user a reading for the total electricity use and does not provide information on which parts of the house use most power. Individual monitors on each appliance can provide this data, but require access to sockets and the appliance to be powered down for fitting and removal.

Dr Wilcock and Mr Rudolf have developed a multi-core clamp sensor that can measure current flowing in any accessible mains cable, giving a more detailed picture of the electricity usage in a home. Through extensive modelling and analysis they have shown that they can calibrate the device and accurately measure mains cable current to a full scale of 16 Amps with an accuracy of better than 1 per cent.

“This is a world first,” says Dr Wilcock. “Many people have tried to do this but non-invasive measurement of current in two- or three-core mains cables is extremely challenging because an equal and opposite current flows in the live and neutral wires, cancelling out the field you are trying to measure. Our system addresses this challenge by using state of the art sensors and elegant calibration and measurement algorithms.”

The new clamp is also ideal for industrial power monitoring – many industrial machines are permanently wired in and have no plug to accommodate a conventional energy monitor. The system will also be invaluable for office energy audits, reducing the need to turn off equipment for fitting and removal, and for electrical test equipment to help electricians find faults.

“There is a £50billion market for energy management systems in the residential sector alone”, says Don Spalinger, Director Research and Innovation Services at the University of Southampton. “Reuben and Robert’s invention has the potential to significantly impact not only the home, but also the office and industrial sectors. The innovation of a non-invasive device to measure the power utilisation of individual equipment will add a whole new approach to the markets, and we see commercialisation of this being done very quickly.”

Professor Sir Richard Brook OBE FREng, Chairman of the ERA Foundation, says “Reducing emissions is a huge challenge and this new sensor promises to advance the accurate monitoring of household energy use. This work is a fine example of the excellent research being done in British universities – as the Academy is currently highlighting through its Engineering for Growth campaign. We are delighted to support Dr Wilcock in developing this innovation further.”

Notes for editors

  1. Founded in 1976, The Royal Academy of Engineering promotes the engineering and technological welfare of the country. Our fellowship – comprising the UK’s most eminent engineers – provides the leadership and expertise for our activities, which focus on the relationships between engineering, technology, and the quality of life. As a national academy, we provide independent and impartial advice to Government; work to secure the next generation of engineers; and provide a voice for Britain’s engineering community.

  2. The ERA Foundation aims to contribute to the economic vitality of the UK by supporting activities that will help to bridge the gap between research and exploitation in the broad field of electrotechnology. The Royal Academy of Engineering ERA Foundation Entrepreneurship Award and £40,000 prize is made possible by the support of the Foundation and was established to identify entrepreneurial researchers working in UK universities, in the field of electro-technology, who are at an early stage in their career. The award is presented to an individual or team annually, who demonstrate considerable entrepreneurial promise and the potential to benefit the UK's future prosperity.

  3. Dr Reuben Wilcock is Enterprise Fellow in the Faculty of Physical Sciences and Engineering at the University of Southampton; Robert Rudolf is a PhD student in Electronics and Computer Science, researching variability in analogue integrated circuits with Dr Peter Wilson.

For more information please contact

Jane Sutton at The Royal Academy of Engineering Tel. 020 7766 0636; email: Jane Sutton