Category Archives: Power Quality

The Trouble With Capacitors Part 1

Published by R. Fehr, P.E., Engineering Consultant, Dec 1, 2003 Although shunt capacitors offer several advantages at all voltage levels, those advantages come at a price. Not only must you purchase, install, and maintain capacitor equipment, you must be able to switch it in and out of service to get the most from the system.Continue reading “The Trouble With Capacitors Part 1”

Hazardous Step Voltage Nearby Pole Exited by High Voltage Surge

Published by Jarosław WIATER, Politechnika Białostocka, Wydział Elektryczny, Katedra Telekomunikacji i Aparatury Elektronicznej Abstract. This paper presents a ground potential rise (GPR) and voltage difference measurement results. Measurements were made for a model of a pole installed in homogeneous ground. The test stand was built in high voltage lab. It allows safe high voltage testingContinue reading “Hazardous Step Voltage Nearby Pole Exited by High Voltage Surge”

Harmonic Current Impact on Transient Overvoltages during Filter Switching-Off

Published by Yuriy VARETSKY1, Roman PAVLYSHYN2, Michał GAJDZICA1,AGH University of Science and Technology (1), Lviv Polytechnic National University(2) Abstract. This paper focuses on the features of power filter switching-off in industrial power supply systems. The filter switching-off behavior under a large amount of a harmonic current component has been analyzed. The effect of harmonic currentContinue reading “Harmonic Current Impact on Transient Overvoltages during Filter Switching-Off”

An Analysis of the Inverter Overvoltage Generated by the Motor

Published by Algirdas BASKYS1, 2, Vytautas BLEIZGYS1, 2, Tadas LIPINSKIS1, 2Center for Physical Sciences and Technology (1), Vilnius Gediminas Technical University (2) Abstract. The overvoltage in the inverter that supplies the AC induction motor, which during the deceleration operates as a generator delivering current back into the inverter DC bus, has been investigated. The investigationContinue reading “An Analysis of the Inverter Overvoltage Generated by the Motor”

Disturbances in Industrial Power Networks

Published by Marek KAŁUSKI, Marek MICHALAK, Mirosław PIETRANIK, Karolina SKRZYPEK, Monika SZAFRAŃSKA, National Institute of Telecommunications Abstract. The paper presents some preliminary results of the in-situ measurements of disturbances that were observed in mine underground power network. The purpose of the measurements was to identify potential interfering signals that may occur in such and similarContinue reading “Disturbances in Industrial Power Networks”

Lightning Currents in Low-Voltage Power Systems

Published by Andrzej SOWA, Bialystok University of Technology, Faculty of Electrical Engineering Abstract: Correctness estimation of lightning protection solutions require definition of lightning current distribution in conductive installations entering the structure during direct strike to lightning protection system of this structure. It concerns particularly this part of lightning current, which flows in electric installation. InformationContinue reading “Lightning Currents in Low-Voltage Power Systems”

Step Voltage Nearby Tree for Surge Current Excitation

Published by Jarosław WIATER, Białystok University of Technology Abstract. Step voltage situation arise when it is possible for a person to make simultaneous contact with a part of an electrical system which is not live under normal conditions but has become live due to the passage of current for example lightning strike one. The purposeContinue reading “Step Voltage Nearby Tree for Surge Current Excitation”

Estimation of Voltage and Current Distortions in the Power System Supplying the AC Arc Furnace

Published by Wiesław BROCIEK1, Robert WILANOWICZ2,Warsaw University of Technology (1) , Radom University of Technology (2) Abstract. The paper presents a circuit model of three phase arc arrangement, taking into account the nonlinearity of the arc appearing In the particular phases as well as the windings vector groups of a furnace transformer. This model wasContinue reading “Estimation of Voltage and Current Distortions in the Power System Supplying the AC Arc Furnace”

Measurement Characteristics of Voltage in Practice and Possibilities for Improvement of Voltage

Published by Alena OTCENASOVA, Juraj ALTUS, Petr HECKO, Marek ROCH,Slovakia, University of Zilina, Faculty of Electrical Engineering, Department of Power Electrical Systems Abstract. Worsened quality of supplied as well as demanded electricity causes in reality a large financial loss. The main quality parameters monitored today are voltage dips and interruptions. In this context there areContinue reading “Measurement Characteristics of Voltage in Practice and Possibilities for Improvement of Voltage”