Nuisance Tripping of Sensitive Customer Power Electronic Equipment

Published by Electrotek Concepts, Inc., PQSoft Case Study: Nuisance Tripping of Sensitive Customer Power Electronic Equipment, Document ID: PQS1011, Date: October 15, 2010. Abstract: This case study presents an investigation of nuisance tripping of sensitive customer power-electronic equipment during utility capacitor bank switching. The simulations for the analysis were completed using the PSCAD program. The powerContinue reading “Nuisance Tripping of Sensitive Customer Power Electronic Equipment”

Impact of Protective Relays on Voltage Sag Index

Published by Xinke GAO1,2 , Yapeng LIU3 , Congying WANG4,School of Electronic, Information and Electrical Engineering, Shanghai Jiao Tong University (1),Institute of Information Technology Luoyang Normal College (2),Power Supply of Qingdao Company, Shandong Electric Power Corporation (3),School of foreign language, Shanghai Jiao Tong University (4) Abstract. This paper provides the probability-assessment analysis on the characteristicContinue reading “Impact of Protective Relays on Voltage Sag Index”

Distribution Transformers Protection Against High Frequency Switching Transients

Published by Dariusz SMUGAŁA1, Wojciech PIASECKI1, Magdalenia OSTROGORSKA1,Marek FLORKOWSKI1, Marek FULCZYK1, Paweł KŁYS2ABB Sp.z.o.o., Corporate Research Center, (1), ABB Sp.z.o.o., ABB Distribution Transformers, (2) Abstract. Distribution transformers protection method against high frequency transients generated during Vacuum Circuit Breaker (VCB) operations is presented in this paper. ATP/EMTP simulations of transients generated during the VCB operation andContinue reading “Distribution Transformers Protection Against High Frequency Switching Transients”

A Methodological Proposal for Monitoring, Analyzing and Estimating Power Quality Indices: the case of Bogotá-Colombia

Published by L. E. Gallego, Student Member IEEE, H. Torres, Member IEEE, F.A. Pavas, Student Member IEEE, D.F. Urrutia, Student Member IEEE, G. A. Cajamarca, and D. Rondón, Student Member IEEE. Abstract—The Estimation of Power Quality (PQ) indices has a vital importance on the development of national PQ standards not only because provides truthful informationContinue reading “A Methodological Proposal for Monitoring, Analyzing and Estimating Power Quality Indices: the case of Bogotá-Colombia”

Feeder Lightning Transients

Published by Electrotek Concepts, Inc., PQSoft Case Study: Feeder Lightning Transients, Document ID: PQS1101, Date: March 15, 2011. Abstract: Lightning strokes to exposed utility transmission or distribution circuits can inject a significant amount of energy into the power system in a very short time, causing deviations in voltages and currents which persist until the excess energyContinue reading “Feeder Lightning Transients”

Steel Plant Transformer Operational Issues

Published by Tadeusz GLINKA1,2, Marek GLINKA2Politechnika Śląska w Gliwicach (1), BOBRME Komel (2) Abstract. Design of steel-plant furnace three-phase transformer (110 kV/(350 to 500) V, 50 kA) and its operating conditions are described in the paper. After three months of operation this transformer failed. Cause of failure, its course and damage to transformer winding areContinue reading “Steel Plant Transformer Operational Issues”

Effect of Synchronous Closing Control on Capacitor Energizing Transients

Published by Electrotek Concepts, Inc., PQSoft Case Study: Effect of Synchronous Closing Control on Capacitor Energizing Transients, Document ID: PQS0903, Date: October 15, 2009. Abstract: The application of utility capacitor banks has long been accepted as a necessary step in the efficient design of utility power systems. In addition, capacitor switching is generally considered a normalContinue reading “Effect of Synchronous Closing Control on Capacitor Energizing Transients”

Distribution System Transient Measurement Data Evaluation

Published by Electrotek Concepts, Inc., PQSoft Case Study: Distribution System Transient Measurement Data Evaluation, Document ID: PQS1012, Date: October 15, 2010. Abstract: This case study presents a utility distribution system transient measurement data analysis. The distribution system included a number of feeders that supplied a mix of residential, commercial, and industrial customers. The causes of theContinue reading “Distribution System Transient Measurement Data Evaluation”

Distribution Feeder Wind Turbine Generator Analysis

Published by Electrotek Concepts, Inc., PQSoft Case Study: Distribution Feeder Wind Turbine Generator Analysis, Document ID: PQS1206, Date: January 26, 2012. Abstract: This case study presents a distribution feeder wind turbine generator analysis. The investigation included several potential causes of turbine and feeder overcurrents and overvoltages, including wind speed variations, cut-out and cut-in switching operations, groundContinue reading “Distribution Feeder Wind Turbine Generator Analysis”

The Effect of PWM Frequency on the Effectiveness of Protection Against Electric Shock using Residual Current Devices

Published by Stanisław CZAPP , Gdańsk University of Technology, Faculty of Electrical and Control Engineering Abstract. In the paper spectral analysis of the distorted earth fault currents in circuits with variable speed drives is performed. Effectiveness of protection against electric shock using residual current devices in circuits with variable speed drives for various PWM frequenciesContinue reading “The Effect of PWM Frequency on the Effectiveness of Protection Against Electric Shock using Residual Current Devices”