Published by Unipower AB, Case Study: UPS Problem at Datacentre, Date: January 29th, 2017. Email: info@unipower.se Summary A software development company builds a new datacentre and experience problems with the UPS units and a hard drive failure. A monitoring system, PQ Secure from Unipower AB, was installed and it could be determined that the UPS units,Continue reading “UPS Problem at Datacentre”
Tag Archives: Harmonics
Choosing The Right Equipment
Published by Unipower AB, Metallgatan 4C, 44132 Alingsås, Sweden. Email: info@unipower.se What do you need to measure? Power quality is assessed based on a number of power quality parameters. Today’s instruments usually handle the most common parameters such as voltage, current, power, harmonics, voltage dips, flicker and transients. Often it is difficult to say in advanceContinue reading “Choosing The Right Equipment”
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”
An Overview of Harmonics in Electrical Systems
Published by Wesco | Anixter, Wesco International. What are harmonics? In an electric power system, a harmonic is a voltage or current at a multiple of the fundamental frequency of the system. Harmonics can best be described as the shape or characteristics of a voltage or current waveform relative to its fundamental frequency. When waveforms deviate from a sinewaveContinue reading “An Overview of Harmonics in Electrical Systems”
Power Quality Improvement in Distributed Generation System under varying Load Conditions using PWM and Hysteresis Controller
Published Vijayshree G1, Sumathi S2, RNSIT, Bangalore,Karnataka,India(1). RNSIT, Bangalore,Karnataka, India(2) Abstract – This paper proposes a power system network modeled using a microgrid, integrated with wind and solar photovoltaic (PV) resources, along with the battery energy storage system (BESS) connected to the three-phase grid feeding the linear and nonlinear load. The simulation is carried outContinue reading “Power Quality Improvement in Distributed Generation System under varying Load Conditions using PWM and Hysteresis Controller”
Evaluating Direction of Harmonics – Power Harmonics
Published by Unipower AB, Metallgatan 4C, 44132 Alingsås, Sweden. Email: info@unipower.se One important issue is how to trace the source of harmonics. The example below shows harmonic filters connected until 11.00 and there is no voltage distortion as expected. After 11.00 the filters were disconnected due to a fault and voltage harmonics can be seen.Continue reading “Evaluating Direction of Harmonics – Power Harmonics”
Eccentricity Fault Identification in Round Rotor Synchronous Motors considering Load Variation
Published by Bashir Mahdi EBRAHIMI1, Jawad FAIZ1, Mohammad ETEMADREZAIE2, Mojtaba BABAIE3, Center of Excellence on Applied Electromagnetic Systems, School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran(1), Department of electrical and computer engineering, Delft, Zuid-holland, Netherlands(2), Faculty of Engineering, Science and Research Campus, Islamic Azad University, Tehran, Iran(3) Abstract. Impacts of load variationContinue reading “Eccentricity Fault Identification in Round Rotor Synchronous Motors considering Load Variation”
Performance Comparison of Harmonic Filters in an Industrial Power System for Harmonic Distortion Reduction
Published by 1. Estifanos Dagnew Mitiku1, 2. Gebrie Teshome Aduye2, 3. S. Abdul Rahman3, 4. Mahilet Mentesinot Abuhay4, Electrical & Computer Engineering Department, Institute of Technology, University of Gondar, Ethiopia (1, 2, 3), Industrial Engineering Department, Institute of Technology, University of Gondar, Ethiopia (4) ORCID. 1. 0000-0002-6613-3979, 2. 0000-0003-1184-9184, 3. 0000-0003-0134-8028, 4. 0000-0001-7554-8562 Abstract: TheContinue reading “Performance Comparison of Harmonic Filters in an Industrial Power System for Harmonic Distortion Reduction”
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