Consumers Protection and Monitoring with Microcontroller Based Device for Low-Voltage Distribution Systems

Published by Petre Lucian OGRUTAN1, Lia Elena ACIU1, Dan LOZNEANU1, Ioan ROSCA2,Transilvania University of Brasov, Romania (1), Transilvania Sud Electricity Distribution (2) Abstract. Protection devices against over-voltage and over-currents for low voltage systems are equipped with varistors and gas-discharge tubes around a fuse, having a disconnection time about 200ms. This paper proposes an intelligent protectionContinue reading “Consumers Protection and Monitoring with Microcontroller Based Device for Low-Voltage Distribution Systems”

Inductors in Series

Published by Blaine Geddes In this article, you find a focus on series-connected inductors where ladder low pass filter structures consisting of series inductors and shunt capacitors are introduced. For inductors connected in series with no mutual flux coupling, the electrical effect is analogous to resistors connected in series and the individual inductance values areContinue reading “Inductors in Series”

The Influence of Earth Thermal Conductivity on Temperature Profile of 110 kV Electric Power Cable System

Published by Janusz TYKOCKI, The State College of Computer Science and Business Administration in Lomza Abstract. The paper presents the conductivity of the ground effect on the distribution of temperature field in three-phase high-voltage cables, 64/110 kV, depending on the depth of their arrangement in the ground. The simulation uses the finite element method FEM.Continue reading “The Influence of Earth Thermal Conductivity on Temperature Profile of 110 kV Electric Power Cable System”

Commercial Facility Harmonic Evaluation

Published by Electrotek Concepts, Inc., PQSoft Case Study: Commercial Facility Harmonic Evaluation, Document ID: PQS1005, Date: March 15, 2010. Abstract: Utility power system harmonic problems can often be solved using a comprehensive approach including site surveys, harmonic measurements, and computer simulations. This case study presents the results for a commercial facility harmonic evaluation. The simulations wereContinue reading “Commercial Facility Harmonic Evaluation”

Protection of Busbar Based on Reed Switches

Published by Mark KLETSEL1, Nariman KABDUALIYEV2, Bauyrzhan MASHRAPOV2, Alexander NEFTISSOV2,National Research Tomsk Polytechnic University (1), Pavlodar State University (2) doi:10.12915/pe.2014.01.21 Abstract. A phase comparison scheme of protection of busbar on the reed switches fixed connections near conductors extending from these busbars which does not require current transformers has been studied. The article provides an analysisContinue reading “Protection of Busbar Based on Reed Switches”

Arc Furnace Harmonic Evaluation

Published by Electrotek Concepts, Inc., PQSoft Case Study: Arc Furnace Harmonic Evaluation, Document ID: PQS1004, Date: March 15, 2010. Abstract: Utility power system harmonic problems can often be solved using a comprehensive approach including site surveys, harmonic measurements, and computer simulations. This case study presents the results for an arc furnace harmonic evaluation. The case studyContinue reading “Arc Furnace Harmonic Evaluation”

Towards Knowledge Engineering Based Guidance for Electrical Engineers

Published by Muhammad MANSOOR, Norman MARIUN, Napsiah ISMAIL, Noor Izzri ABDULWAHAB,Faculty of Engineering, University Putra Malaysia (UPM) Abstract. This paper proposes a concept of knowledge engineering based innovative approach for seeking solutions related to electrical engineering systems. The knowledge base approach is discussed for its effectiveness at preliminary stages of solution hunting and solution design,Continue reading “Towards Knowledge Engineering Based Guidance for Electrical Engineers”

Substation Transformer Switching and Dynamic Overvoltages

Published by Electrotek Concepts, Inc., PQSoft Case Study: Substation Transformer Switching and Dynamic Overvoltages, Document ID: PQS1204, Date: January 26, 2012. Abstract: This case study presents the results for a wind plant substation transformer energizing and dynamic overvoltage evaluation. Transformer inrush currents contain harmonic components that may create dynamic overvoltages if a substation transformer is energizedContinue reading “Substation Transformer Switching and Dynamic Overvoltages”

Harmonics Analysis: Using Fourier to Analyze Waveforms

Published by Amna Ahmad All repetitive waveforms can be composed of combinations of many sinusoidal waves. Any waveform can be analyzed to determine the component quantities. In this article, learn how to use Fourier Analysis to determine the amplitudes of harmonic components and their phase relationship to the fundamental component in various periodic non-sinusoidal waveforms.Continue reading “Harmonics Analysis: Using Fourier to Analyze Waveforms”

Influence of HV LC Filter on Lightning Overvoltages in Gas-Insulated Switchgear Substations

Published by Marcin SZEWCZYK, Tomasz KUCZEK, Mariusz STOSUR, Wojciech PIASECKI, Marek FLORKOWSKI, Marek FULCZYK, ABB Corporate Research Center in Krakow, Poland Abstract. In the present paper simulations of the propagation of lightning overvoltages in a typical HV GIS substation are presented. The influence of HV LC filter on maximum overvoltages peak values was analyzed. Additionally,Continue reading “Influence of HV LC Filter on Lightning Overvoltages in Gas-Insulated Switchgear Substations”