Published by Ahmed Sheikh, EE Power – Technical Articles: Transformer Maintenance: Planning for Failure, September 26, 2023. This article examines transformer maintenance, including simple checks involving temperature and sound that indicate potential issues, maintenance procedures for energized and de-energized dry transformers, and assessments for energized liquid-cooled transformers. Because transformers are so reliable and most of theirContinue reading “Transformer Maintenance: Planning for Failure”
Tag Archives: Safety/Protection
Tests of Selected Distance Protection Functions of Modern Protective Relay used for HV and EHV Transmission Lines Protection
Published by Marcin JANUSZEWSKI, Ryszard KOWALIK, Karol KUREK, Emil BARTOSIEWICZ, Adam SMOLARCZYK, Désiré D. RASOLOMAMPIONONA, Warsaw University of Technology, Electrical Power Engineering Institute Abstract. This article describes the comparison of test results of distance protection functions (ANSI 21) implemented in protective relays of various manufacturers dedicated to HV and EHV lines protection. A special emphasisContinue reading “Tests of Selected Distance Protection Functions of Modern Protective Relay used for HV and EHV Transmission Lines Protection”
Distance Protection Analysis Applied for Distribution System with Distributed Generation
Published by João T. L. S. CAMPOS1,2, Huilman S. SANCA1, Flavio B. COSTA3, Benemar A. de SOUZA1, Universidade Federal de Campina Grande (1), Universidade Potiguar (2), Universidade Federal do Rio Grande do Norte (3) Abstract. In power systems, the over-current protection scheme and, optionally with directional function, and distance function are the main protection used,Continue reading “Distance Protection Analysis Applied for Distribution System with Distributed Generation”
Autotransformers for Power Systems
Published by Waldemar ZIOMEK, PTI Manitoba Inc., Winnipeg, MB, Canada Abstract. When the primary and secondary voltages are obtained from the same winding, or from two windings which are galvanically connected, such a transformer is called an autotransformer. The paper will focus on fundamentals, design and applications of autotransformers of core-type design. The selected problemsContinue reading “Autotransformers for Power Systems”
Application of Additional Grounded Wires in High Voltage Overhead Power Lines to Reduce the Intensity of Electric Field Generated by Phase Wires
Pubsliehd by Jacek GUMIELA1, Dariusz SZTAFROWSKI1 Politechnika Wrocławska, Katedra Energoelektryki (1) Abstract. To minimize interference with the environment it is important to make every effort already at the design stage to spare the trouble associated with additional investment later on. Due to the value of land in urban areas, it is beneficial to take necessaryContinue reading “Application of Additional Grounded Wires in High Voltage Overhead Power Lines to Reduce the Intensity of Electric Field Generated by Phase Wires”
Substation Shielding Methods for Lightning Strikes
Published by Lorenzo Mari, EE Power – Technical Articles: Substation Shielding Methods for Lightning Strikes, December 04, 2020. This article explains different substation shielding techniques used to reduce the chance of and damage from direct lightning strikes. Direct lightning strikes to transmission lines or substations may damage the electrical equipment and threaten any nearby personnel. This article focusesContinue reading “Substation Shielding Methods for Lightning Strikes”
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”
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”
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?”
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