Electric voltages and currents that appear on the electric power system as a result of non-linear electric loads and are a frequent cause of power quality problems.
Royal Academy of Engineering, Extreme Space Weather: Impacts on Engineered Systems and Infrastructure - Summary report, Glossary & Abbreviations and acronyms, ISBN 1-903496-96-9, London, UK 2013, http://www.raeng.org.uk/publications/reports/space -weather-summary-report, (Space Wthr - Amer) {861}