Published by Dranetz Technologies, Inc. Website: Dranetz.com Severe power quality problems damaged X-ray equipment, costing $100,000 in one instance. The source of the problem was the switch over from utility to generator power, during regular testing and emergency situations. Figure 1 (below) identified the cause of the problem, an out-of-phase transfer, captured by On Power with aContinue reading “Damaged X-ray Equipment at Major Health Care Center”
Tag Archives: Total Harmonic Distortion (THD)
PQ Terms & Definitions
Published by Dranetz Technologies, Inc. Website: Dranetz.com PU (Per Unit) Explained PU stands for Per Unit. It is a term that electric utility engineers frequently use, and it was incorporated into IEEE 1159. PU is the percentage formed by dividing the actual voltage by the nominal. For example, a sag to 0.8 pu on a 480V circuitContinue reading “PQ Terms & Definitions”
Comparison of Compact Fluorescent to Incandescent Bulbs
Published by Dranetz Technologies, Inc., Case Study With the proliferation of Compact Florescent (CF) lighting, we thought it would be interesting to do a side by side comparison to an incandescent bulb using our new Energy Platform EP1. Not only is it a great demonstration of the capabilities of the EP1 but it’s also an opportunity toContinue reading “Comparison of Compact Fluorescent to Incandescent Bulbs”
A Novel Method to Improve the Power Quality Via Hybrid System
Published by 1. Raghad Adeeb Othman1, 2. Omar Sh. Alyozbaky2,Department of Electrical Engineering, College of Engineering, University of Mosul, Iraq (1,2)ORCID: 1. 0000-0001-5875-9210; 2. 0000-0002-9735-1469 Abstract. Ever increasing electricity demand as well as the rapid depletion of fossil fuels have increased the need for hybrid power systems that integrate distributed energy resource (DER) systems; suchContinue reading “A Novel Method to Improve the Power Quality Via Hybrid System”
Presentation Harmonics Distortion of Power Waveforms Signals
Published by Małgorzata ZYGARLICKA1, Jarosław ZYGARLICKI2, Politechnika Opolska, Instytut Automatyki i Informatyki (1) Politechnika Opolska, Instytut Elektroenergetyki i Energii Odnawialnej (2) Abstract. The paper presents a new proposal for the presentation of the harmonic distortion of the power signals. The proposed method uses a simplified method of harmonic analysis – five ordinates method by whichContinue reading “Presentation Harmonics Distortion of Power Waveforms Signals”
Power Quality Analysis: Case Study for Induction Motor and 110/35kV Substation
Published by 1. Nuri Berisha, 2. Bahri Prebreza*, 3. Petrit Emini, Faculty of Electrical and Computer Engineering, University of PrishtinaORCID: 1. 0000-0001-8615-637X; 2. 0000-0003-1950-026X; 3. 0000-0002-2833-9001 Abstract. Power system harmonics have a significant impact on the efficiency, reliability, and stability of the system. Low power quality is determined by undervoltages and overvoltages, dips and swells,Continue reading “Power Quality Analysis: Case Study for Induction Motor and 110/35kV Substation”
Ultra–Fast Charging of Electric Bus Fleet and its Impact on Power Quality Parameters
Published by 1. Aleksander CHUDY, 2. Paweł A. MAZUREK, Lublin University of Technology ORCID: 1. 0000-0002-3183-8450, 2. 0000-0002-7098-2084 Abstract. The research focused on one–week long measurement of power quality parameters at the connection point of a 450 kW charging station (pantograph type) in the distribution substation. The bus terminal was equipped with 1200 kVA 15.75/0.42Continue reading “Ultra–Fast Charging of Electric Bus Fleet and its Impact on Power Quality Parameters”
Container Harbour in Gothenburg
Published by Jonny Carlsson, Unipower AB, Case Study: Container Harbour in Gothenburg, Date: November 8th, 2010. http://www.unipower.se The most important problem was the sags that were caused by the container cranes. The cranes created a lot of high reactive power during the start of the lift procedure. The high currents caused high demand on the transformerContinue reading “Container Harbour in Gothenburg”
Harmonic Information Management System
Published by 1. Johan ADOLFSSON, Director, Unipower AB, ja@unipower.se, 2. Peter ANDERSSON, CEO, Unipower AB, psa@unipower.se, 3. Nilesh CHINTALWAR, GM, PCI Ltd, nilesh@prime-pci.in, 4. Shital SHAH, PCI Ltd, shitalshah@prime-pci.in INTRODUCTION In the vast majority of countries today there are regulations and standards implemented that specify the maximum level of harmonic content. Some countries implement theContinue reading “Harmonic Information Management System”
Measuring PQ Issues in a Bus Depot Using Unipower HW and Software
Published by Unipower AB, Metallgatan 4C, 44132 Alingsås, Sweden. Email: info@unipower.se Introduction This case study explores how advanced power quality measurement technology facilitated the diagnosis of severe power quality disturbances in a bus depot. These disturbances, which neither the bus operator nor the bus manufacturer initially attributed to electrical quality issues, were ultimately traced toContinue reading “Measuring PQ Issues in a Bus Depot Using Unipower HW and Software”
Power Quality Blog 