Published by Dranetz Technologies, Inc., Case Study A busy trading floor was experiencing difficulties with their six air handling units, which were fed from a single 480V, 400-amp service. The units were malfunctioning, stalling and at times were unable to start, causing the temperature in the control room to rise to unacceptable levels. A Dranetz Power PlatformContinue reading “Overloaded Service”
Tag Archives: Overvoltage
Analysis of Switching Overvoltages and Protection from Atmospheric Overvoltages for 400kV Switchgears in the Kosovo Power System using ATP/EMTP
Published by 1. Bahri PREBREZA, 2. Nuri BERISHA1*, 3. Bashkim STATOVCI, Faculty of Electrical and Computer Engineering, University of PrishtinaORCID: 1. 0000-0003-1950-026X; 2. 0000-0001-8615-637X; 3. 0000-0002-6840-0778 Abstract. Power systems might experience electrical problems or power outages, due to atmospheric discharges. The quality of the protection from atmospheric overvoltages will increase the life of the equipmentContinue reading “Analysis of Switching Overvoltages and Protection from Atmospheric Overvoltages for 400kV Switchgears in the Kosovo Power System using ATP/EMTP”
Extra High Voltage Transmission Line Lightening Protection using Surge Arrester
Published by Ali HAMOODI, Rasha MOHAMMED, Bashar SALIH, Northern Technical University, Engineering technical college Abstract. The objective of this work was to protect the transmission line (T.L.) from the lightning effect. In the last decades, several methodologies have been employed for the rise of lightning performance on the T.L Lightning with high values of currentContinue reading “Extra High Voltage Transmission Line Lightening Protection using Surge Arrester”
Analysis of Transient Electromagnetic Processes in the Ultrahigh Voltage Transmission Line during Two-Phase Short Circuits
Published by 1. Tomasz PERZYŃSKI1, 2. Vitaliy LEVONIUK2, 3. Radosław FIGURA1, Faculty of Transport, Electrical Engineering and Computer Science, University of Technology and Humanities in Radom (1) Department of Electrical Systems, Lviv National Agrarian University (2)ORCID: 1. 0000-0001-5105-5034; 2. 0000-0003-2113-107X; 3. 0000-0001-8048-5623 Abstract. The mathematical model of a fragment of ultrahigh voltage electric network isContinue reading “Analysis of Transient Electromagnetic Processes in the Ultrahigh Voltage Transmission Line during Two-Phase Short Circuits”
Semi-Analytic Calculations of Overvoltages caused by Direct Lightning Strike in Buried Coaxial Cable
Published by Karol ANISEROWICZ, Renata MARKOWSKA, Bialystok University of Technology Abstract. Results of calculations of overvoltages caused by a direct lightning strike to an underground coaxial cable are presented. Analytic formulas are used in the frequency domain. The time-domain waveforms are computed using the Inverse Discrete Fourier Transform (IDFT). Streszczenie. Przedstawiono wyniki obliczeń przepięć spowodowanychContinue reading “Semi-Analytic Calculations of Overvoltages caused by Direct Lightning Strike in Buried Coaxial Cable”
Overvoltage Induced in Overhead Power Lines by nearby Lightning Stroke
Published by Grzegorz MASŁOWSKI, Robert ZIEMBA, Tomasz KOSSOWSKI,Rzeszow University of Technology Abstract. The results of simulations of overvoltages induced in the overhead transmission line, caused by nearby lightning stroke are presented. Calculations were made using the LIOV module implemented in the EMTP-RV program. The influence of the distance of the lightning channel from the lineContinue reading “Overvoltage Induced in Overhead Power Lines by nearby Lightning Stroke”
Hybrid Switch for Capacitors Bank used in Reactive Power Compensation
Published by Adam RUSZCZYK1, Krzysztof KÓSKA1, Konrad JANISZ2ABB Corporate Research Centre, Poland (1), AGH University of Science and Technology, Poland (2) Abstract. This paper describes new concept of a switch dedicated for control of three-phase capacitor bank used for low voltage, reactive power compensation. The proposed device utilizes fully controlled IGBT transistors that gives possibilityContinue reading “Hybrid Switch for Capacitors Bank used in Reactive Power Compensation”
Surge Protection Technical Supplements
Published by Electrical Installation Wiki, Chapter J. Overvoltage protection – Surge protection technical supplements Lightning protection standards The IEC 62305 standard parts 1 to 4 (NF EN 62305 parts 1 to 4) reorganizes and updates the standard publications IEC 61024 (series), IEC 61312 (series) and IEC 61663 (series) on lightning protection systems. Part 1 – General principles ThisContinue reading “Surge Protection Technical Supplements”
Surge Protection Application Examples
Published by Electrical Installation Wiki, Chapter J. Overvoltage protection – Surge protection Application examples SPD application example in Supermarket Solutions and schematic diagram • The surge arrester selection guide has made it possible to determine the precise value of the surge arrester at the incoming end of the installation and that of the associated disconnection circuitContinue reading “Surge Protection Application Examples”
Installation of Surge Protection Device
Published by Electrical Installation Wiki, Chapter J. Overvoltage protection – Installation of Surge Protection Device Connection of Surge Protection Device Connections of a SPD to the loads should be as short as possible in order to reduce the value of the voltage protection level (installed Up) on the terminals of the protected equipment. The total lengthContinue reading “Installation of Surge Protection Device”
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