PQBlog

Measuring and Diagnostic System for Analysis of Transformer Insulation by Return Voltage Method

Published by Milan ŠIMKO1, Daniel KORENČIAK1, Miroslav GUTTEN1, Richard JANURA1,University of Zilina, Slovakia (1) Abstract. The first part of paper deals with the base information about diagnostics and analysis of transformer insulating system in time domain. The second part of paper deals with proposal measuring system of moisture analysis by return voltage method (RVM) forContinue reading “Measuring and Diagnostic System for Analysis of Transformer Insulation by Return Voltage Method”

How to Reduce the Soil’s Resistivity

Published by Lorenzo Mari, EE Power – Technical Articles: How to Reduce the Soil’s Resistivity, September 28, 2020. Lowering the resistance of a grounding electrode is not always enough to reduce the soil’s resistivity. Reducing the resistivity of the soil around the electrodes can help achieve adequate resistance to the ground. The elements that most affectContinue reading “How to Reduce the Soil’s Resistivity”

Electromagnetic Disturbances Propagation Along a Grounding Grid Subjected to Lightning Currents

Published by Rafael ALIPIO, Renan SEGANTINI, Federal Centre of Technological Education of Minas Gerais Abstract. This paper assesses the transient distribution of potentials along a grounding grid subjected to currents representative of first and subsequent strokes. It is shown that the transient non-uniform distribution of potential along the grounding system may lead to the flowContinue reading “Electromagnetic Disturbances Propagation Along a Grounding Grid Subjected to Lightning Currents”

Influence of Distributed Generation on Sectionalizing Switches Placement in MV Distribution Networks

Published by Wojciech BĄCHOREK1, Mariusz BENESZ1, AGH University of Science and Technology (1) Abstract. This paper presents the influence of distributed generation DG and reclosers placement on the reliability of distribution network. The brute force method and evolutionary algorithm were used to solve the optimization task. The placement of the switches was determined independently usingContinue reading “Influence of Distributed Generation on Sectionalizing Switches Placement in MV Distribution Networks”

Power System Grounding: Understanding Lightning Strikes

Published by Lorenzo Mari, EE Power – Technical Articles: Power System Grounding: Understanding Lightning Strikes, November 13, 2020. Learn about the fundamentals of lightning strikes and the risk they pose for electric power systems and operator safety. Lightning is an electrical discharge of the accumulation of electrostatic electricity from cloud to cloud, within a cloud, orContinue reading “Power System Grounding: Understanding Lightning Strikes”

Methods for Determining Power Losses in Cable Lines with Non-Linear Load

Published by Łukasz TOPOLSKI, Jurij WARECKI, Zbigniew HANZELKA, AGH University of Science and Technology Abstract. Harmonic currents in power cables cause additional power losses associated with phenomena that increase the temperature of the cable insulation and make its service life shorter. For these reasons, it is important to choose methods for determining active power losses,Continue reading “Methods for Determining Power Losses in Cable Lines with Non-Linear Load”

AC Equipment Grounding: How Dangerous are Electric Shocks?

Published by Lorenzo Mari, EE Power – Technical Articles: AC Equipment Grounding: How Dangerous are Electric Shocks?, July 31, 2020. This article looks at the effects of AC electric current on the human body. An electric current passing through the human body can cause death. On many occasions, the cause of death is in the heart,Continue reading “AC Equipment Grounding: How Dangerous are Electric Shocks?”

The Influence of Power Supply Network Inductance on the HTS Transformer Inrush Current

Published by Grzegorz KOMARZYNIEC1, The Lublin University of Technology, Institute of Electrical Engineering and Electrotechnologies (1) Abstract. The HTS transformer inrush current may lead to thermal damage its windings made of HTS 2G tapes. The parameters affecting the value and duration of the inrush current are: the impedance of the transformer windings and the impedanceContinue reading “The Influence of Power Supply Network Inductance on the HTS Transformer Inrush Current”

Improved Control Strategy of Wind Energy Conversion System with PMSG during Low Voltage Sags

Published by Piotr GAJEWSKI, Wrocław University of Science and Technology, Department of Electrical Machines, Drives and Measurements Abstract. The paper presents the improved control strategy for Wind Energy Conversion System (WECS) during voltage sags. The considered back-to-back converter system includes: Ma-chine Side Converter (MSC) and Grid Side Converter (GSC) with control circuits. To the windContinue reading “Improved Control Strategy of Wind Energy Conversion System with PMSG during Low Voltage Sags”

What are Overcurrent Protection Devices?

Published by Alex Roderick, EE Power – Technical Articles: What are Overcurrent Protection Devices?, February 10, 2021. Learn about the basics of overcurrent, how it occurs, and ways to protect against and prevent it in power circuits. To have a properly operating circuit, current flow should be confined to a safe level. This safe level ofContinue reading “What are Overcurrent Protection Devices?”