HOME PRODUCTS AND SERVICES ABOUT NEWS ABOUT POWER QUALITY CONTACT SVENSKA Home About Unipower Research RESEARCH An important part of our activities is the research that we carry out together with universities and experts within the field. We are members of TC77/SC77A that are responsible for the development of the IEC 61000-4-30 standard defining the requirements of PQ analyzers now and tomorrow. Unipower has also developed unique algorithms for classification of disturbances and tracing the source of flicker. These measuring methods are patented. SEARCH Search for: CONTACT US Phone: +46 322 638020 Email: info@unipower.se • Official postal address: Box 411, 44128 Alingsås, Sweden • Visiting and courier address: Metallgatan 4C, 44132 Alingsås, Sweden © Copyright 1998 - 2020 - Unipower AB, Sweden Privacy Policy (English) - Integritetspolicy (svenska) - Kvalitets- och Miljöpolicy (svenska) By continuing to use the site, you agree to the use of cookies. more information ACCEPT

HOME PRODUCTS AND SERVICES ABOUT NEWS ABOUT POWER QUALITY CONTACT SVENSKA ABOUT POWER QUALITY Power quality is a generic term for disturbance-free electricity supply. Deviation from voltage sinusoidal waveform (50 Hz), which may result in equipment being disturbed or damaged, is to be regarded as a power quality disturbance. This means that the more sensitive equipment you connect to the grid, the higher should your demands on power quality and disturbance-free environment be. Voltage dips Voltage swells Transients Harmonics Unbalance Flicker RVC - Rapid Voltage Change Frequency deviations VOLTAGE DIPS (SAGS) By dips we normally mean voltage drops that are deeper than 10 percent of the nominal voltage level and have a duration longer than 20 ms (one period). Compared with transients dips are slower disturbances; therefore, they have an impact on voltage rms. SOURCES OF DISTURBANCE Common sources of disturbance that cause voltage dips are thunder, earth fault, short circuit, motor starting, pumps, mills, and welding machines. CONSEQUENCES When a voltage dip occurs, it results in an energy deficit which disturbs electronics, control systems, computers, robots and other equipment. Other consequences are disruptions of drives, blinking of lightbulbs, disturbances in thermal processes/foundries, machine breakdowns, shutdowns etc. It has also been shown that voltage dips can cause surges in electronic devices that may be damaged by this. COSTS Total costs for voltage dips with short breaks (less than 3 minutes) for Swedish electricity customers are estimated at 1,400 million SEK per year (UPN, 2006). Hardest hit are the process and manufacturing industries, where different types of downtime cause major economic losses. QUESTIONS? CONTACT US SEARCH Search for: CONTACT US Phone: +46 322 638020 Email: info@unipower.se • Official postal address: Box 411, 44128 Alingsås, Sweden • Visiting and courier address: Metallgatan 4C, 44132 Alingsås, Sweden © Copyright 1998 - 2020 - Unipower AB, Sweden Privacy Policy (English) - Integritetspolicy (svenska) - Kvalitets- och Miljöpolicy (svenska) By continuing to use the site, you agree to the use of cookies. more information ACCEPT