Practical Case Study: Measurement of Power Quality Problems Caused by Common New Loads

Published by M.Sc Marko Pikkarainen, M.Sc Pekka Nevalainen, Dr. Pertti Pakonen, Prof. Pekka Verho, Tampere University of Technology, marko.pikkarainen@tut.fi ABSTRACT Two matters have strongly affected use of energy in Finland during recent years. The one is the greenhouse effect and the other is the energy price which has risen. These points have brought to theContinue reading “Practical Case Study: Measurement of Power Quality Problems Caused by Common New Loads”

Customer Data Analysis

Published by Electrotek Concepts, Inc., PQSoft Case Study: Customer Data Analysis, Document ID: PQS1102, Date: March 15, 2011. Abstract: Monitoring is often used to characterize power quality levels at various locations on utility and customer power systems. Field measurements provide a convenient means to characterize power quality problems. This case study summarizes a commercial customer powerContinue reading “Customer Data Analysis”

Monitoring Objectives and Screening Procedures – Distribution Feeder Capacitor Bank Application

Published by Electrotek Concepts, Inc., PQSoft Case Study: Monitoring Objectives and Screening Procedures – Distribution Feeder Capacitor Bank Application, Document ID: PQS0708, Date: January 1, 2007. Abstract: Power quality problems encompass a wide range of disturbances and conditions on utility and customer power systems. They include everything from very fast transient overvoltages to long duration outages.Continue reading “Monitoring Objectives and Screening Procedures – Distribution Feeder Capacitor Bank Application”

Transformer Energizing and Dynamic Overvoltages

Published by Electrotek Concepts, Inc., PQSoft Case Study: Transformer Energizing and Dynamic Overvoltages, Document ID: PQS0709, Date: October 15, 2007. Abstract: Energizing power transformers results in inrush currents that are rich in harmonic components. The inrush current interacts with the system impedance vs. frequency characteristics to create a voltage waveform that can have significant harmonic componentsContinue reading “Transformer Energizing and Dynamic Overvoltages”

Modeling Ferroresonance in an Underground Distribution System

Published by Electrotek Concepts, Inc., PQSoft Case Study: Modeling Ferroresonance in an Underground Distribution System, Document ID: PQS0610, Date: July 1, 2006. Abstract: The objective of this case study is to provide an overview of ferroresonance phenomena, its modeling aspects, and practical experience in recognizing, avoiding, and solving the problem. In particular, it will present symptomsContinue reading “Modeling Ferroresonance in an Underground Distribution System”

General Reference – Ferroresonance

Published by Electrotek Concepts, Inc., PQSoft Case Study: General Reference – Ferroresonance, Document ID: PQS0607, Date: July 1, 2006. Abstract: The term ferroresonance refers to a special kind of resonance that involves capacitor and iron-core inductance. The most common condition in which it causes disturbances is when the magnetizing impedance of a transformer is placed inContinue reading “General Reference – Ferroresonance”

Ferroresonance in an Underground Distribution System

Published by Electrotek Concepts, Inc., PQSoft Case Study: Ferroresonance in an Underground Distribution System, Document ID: PQS0710, Date: October 15, 2007. Abstract: The term ferroresonance refers to a special kind of resonance that involves capacitor and iron-core inductance. The most common condition in which it causes disturbances is when the magnetizing impedance of a transformer isContinue reading “Ferroresonance in an Underground Distribution System”

Ferroresonance Analysis – 25kV Single 5-Legged Core Transformer

Published by Electrotek Concepts, Inc., PQSoft Case Study: Ferroresonance Analysis – 25kV Single 5-Legged Core Transformer, Document ID: PQS0318, Date: July 18, 2002. Abstract: Ferroresonance is a concern for medium voltage underground systems. As part of an evaluation of the design of a new 25kV underground system, the potential for ferroresonance was analyzed. Ferroresonance requires aContinue reading “Ferroresonance Analysis – 25kV Single 5-Legged Core Transformer”

Monitoring and Analysis of Power Quality Issues in Distribution Network

– A Case Study Published by V. S. Jape#1, D. S. Bankar*2, Tejaswini Sarwade#3Electrical Engineering1, Electrical Engineering2, Electrical Engineering3, BVDU Pune1, BVDU Pune2, SPPU Pune31jape_swati@yahoo.co.in , 2dsbankar@bvucoep.edu.in , 3sarwadet@gmail.com Abstract — Tracking of system overall performance in phrases of Power Quality disturbances and its ill effects on distribution network is growing attention of application towardsContinue reading “Monitoring and Analysis of Power Quality Issues in Distribution Network”

Distribution Feeder Energizing

Published by Electrotek Concepts, Inc., PQSoft Case Study: Distribution Feeder Energizing, Document ID: PQS0711, Date: October 15, 2007. Abstract: The energization transients for distribution feeders are generally a combination of line energizing, transformer inrush, and load inrush. Line energizing transients typically decay to negligible values in about one-half cycle and they generally do not pose significantContinue reading “Distribution Feeder Energizing”