Category Archives: Power Quality

Evaluating Supraharmonics up to 150 kHz in Electric Vehicles at the University of Applied Sciences Bingen

Published by Jürgen Blum, Product Manager, Power Quality, A. Eberle GmbH & Co. KG In the first part of the measurement campaign of 2016, various electric vehicles were evaluated in terms of their charging behavior and their loading effects on the power grid. The evaluation covered from DC up to the 50th harmonic or supraharmonicsContinue reading “Evaluating Supraharmonics up to 150 kHz in Electric Vehicles at the University of Applied Sciences Bingen”

What is Contact Resistance Test and Why is Contact Resistance Testing Done

Published by Carelabs (Carelabz), Website: carelabz.com What is Contact Resistance Contact resistance is the resistance to current flow, due to surface conditions and other causes, when contacts are touching one another (in the closed condition of the device). This can occur between contacts of:  Breakers  Contactors  Relays  Switches  Connectors  Other switching devices  Contact resistance testing alsoContinue reading “What is Contact Resistance Test and Why is Contact Resistance Testing Done”

Hot Stuff! Power Monitoring on Live Circuits Can Be Done Safely

Published by Michael Daish, Summit Technology, Inc, Walnut Creek, CA Introduction Our modern technological world depends on systems and processes that require 24 x 7 x 365 operation. When their electrical infrastructures need maintenance it must inevitably be performed on live circuits. This article discusses a procedure to keep workers safe when performing “hot work”.Continue reading “Hot Stuff! Power Monitoring on Live Circuits Can Be Done Safely”

What problems do non-linear loads and harmonics create?

Published by Mirus International Inc., [2010-01-08] MIRUS-FAQ001-B2, FAQ’s Harmonic Mitigating Transformers, 31 Sun Pac Blvd., Brampton, Ontario, Canada. L6S 5P6. Most power systems can accommodate a certain level of harmonic currents but will experience problems when they become a significant component of the overall load. As these higher frequency harmonic currents flow through the powerContinue reading “What problems do non-linear loads and harmonics create?”

Learn About Residual Current Device Testing and Safety

Published by Carelabs (Carelabz), Website: carelabz.com Residual Current Device offer a level of personal protection that ordinary fuses and circuit-breakers cannot provide. Residual Current Devices, or RCDs. are safety switches that prevent people from getting electrocuted in homes and businesses. The device monitors the flow of electricity as it enters a property from the main distribution panel. A surge ofContinue reading “Learn About Residual Current Device Testing and Safety”

Power Quality Problems and New Solutions

Published by A. de Almeida, L. Moreira, J. Delgado, ISR – Department of Electrical and Computer Engineering, University of Coimbra, Pólo II, 3030-290 Coimbra (Portugal), Phone: +351 239 796 218, fax: +351 239 406 672, E-mail: adealmeida@isr.uc.pt, licinio@isr.uc.pt, Jdelgado@elect.estv.ipv.pt. Abstract: In this paper, the main Power Quality (PQ) problems are presented with their associated causesContinue reading “Power Quality Problems and New Solutions”

What is an SMPS and how does it generate harmonics?

Published by Mirus International Inc., [2010-01-08] MIRUS-FAQ001-B2, FAQ’s Harmonic Mitigating Transformers, 31 Sun Pac Blvd., Brampton, Ontario, Canada. L6S 5P6. What is an SMPS and how does it generate harmonics? The Switch-mode Power Supply (SMPS) is found in most power electronics today. Its reduced size and weight, better energy efficiency and lower cost make itContinue reading “What is an SMPS and how does it generate harmonics?”

Why is Electrical Infrared Thermography Inspection Important?

Published by Carelabs (Carelabz), Website: carelabz.com Infrared Scanning of electrical installations falls under classification of Predictive Maintenance Fault Finding. The value is that we are now able to predict an electrical fault before the element fails completely. We are able to get this due to the heat build-up of any electrical element under stress and predict thatContinue reading “Why is Electrical Infrared Thermography Inspection Important?”

Some Comments on Power Acceptability Curves

Published by G. Heydt , Arizona State University Tempe, Arizona USA R. Thallam, Salt River Project Phoenix, Arizona USA M. Albu, Universitatea Politehnica Bucureşti Bucharest, Romania CARIBBEAN COLLOQUIUM ON POWER QUALITY (CCPQ), JUNE 2003 Abstract Power acceptability curves, also known as voltage vulnerability or sensitivity curves, have been used for over 30 years to characterizeContinue reading “Some Comments on Power Acceptability Curves”