Published by Andrzej Ł. CHOJNACKI, Kielce University of Technology, Department of Power Engineering ORCID: 0000-0002-9227-7538 Abstract. The article presents the results of analyses concerning the seasonality and causes of damage to equipment and facilities operated in 110kV, MV and LV power distribution networks. These facilities include 110kV overhead lines, 110kV/SN substations, MV overhead and cableContinue reading “Analysis of Seasonality and Causes of Equipment and Facility Failures in Electric Power Distribution Networks”
Yearly Archives: 2025
UPS Problem at Datacentre
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”
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”
Modelling and Analysis of SA-SPV System with Bi-Directional Inverter for Lighting Load
Published by Mustafa Hussein Ibrahim1, Muhammed A Ibrahim2, Salam Ibrahim khather3, University of Mosul (1), Ninevah University (2,3) ORCID: 1. 0000-0002-9950-6524, 2. 0000-0003-4818-1245, 3. 0000-0002-9082-2360 Abstract. The standalone solar photovoltaic system (SA-SPV) is an appealing alternative for carrying out the electrification process in rural regions through packages in lots of countries. The photovoltaic systems areContinue reading “Modelling and Analysis of SA-SPV System with Bi-Directional Inverter for Lighting Load”
Example of Frequency Variations causing SlowScan Recording
Published by Jonny Carlsson, Unipower AB, Case Study: Example of Frequency Variations causing SlowScan Recording, Date: October 25th, 2011. http://www.unipower.se In the following examples a Unipower UP2210 Power Quality meter is measuring SlowScan events. The SlowScan trig level is set to 50Hz +- 0.15Hz with a recorder time of 120 seconds. Example 1:The voltage level isContinue reading “Example of Frequency Variations causing SlowScan Recording”
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”
Differences between IEC and IEEE Standards of Transformers
Published by Indi. Wang Focus on the transformers | Electrical transformer business developer | With IEC authentication CE ISO9001:2000 Hefei, Anhui, China When it comes to adding or replacing transformers in oil and gas plants, operators need to consider various factors to optimize their operations. In this article, we will explore the differences between theContinue reading “Differences between IEC and IEEE Standards of Transformers”
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”
ERP Systems in Energy Industry – Opportunities and Challenges
Published by 1. Edyta KUCHARSKA, 2. Katarzyna GROBLER-DĘBSKA, 3. Jerzy BARANOWSKI, 4. Waldemar BAUER, 5. Nataliia KASHPRUK, AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, KRAKOW, POLAND ORCID: 1. 0000-0001-6551-5062; 2. 0000-0003-3062-5987, 3. 0000-0003-3313-581X, 4. 0000-0002-8543-0995, 5. 0000-0001-5599-5509 Abstract. The article describes the use of ERP systems to support the management of companies in the energy industry.Continue reading “ERP Systems in Energy Industry – Opportunities and Challenges”
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”
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