PQBlog

Investigation of Harmonic Generation from Dimmable LED Lamps

Published by Sohel UDDIN1, Hussain SHAREEF1, Azah MOHAMED1, M A HANNAN1Dept. of Electrical, Electronic & Systems Engineering (1), Universiti Kebangsaan Malaysia (1) Abstract. The purpose of this paper is to investigate harmonic generation from dimmable Light Emitting Diode lamps (LEDs) which are used in residential and commercial applications as an energy efficient lighting systems. ItContinue reading “Investigation of Harmonic Generation from Dimmable LED Lamps”

Evaluation of Capacitor Bank Switch Restrikes

Published by Electrotek Concepts, Inc., PQSoft Case Study: Evaluation of Capacitor Bank Switch Restrikes, Document ID: PQS0606, Date: April 1, 2006. Abstract: The analysis of high voltage capacitor switching consists primarily of measurements and computer simulations. There are a number of important transient related concerns when transmission and distribution voltage level capacitor banks are applied, includingContinue reading “Evaluation of Capacitor Bank Switch Restrikes”

Customer Adjustable-Speed Drive Motor Failure Evaluation

Published by Electrotek Concepts, Inc., PQSoft Case Study: Customer Adjustable-Speed Drive Motor Failure Evaluation, Document ID: PQS1010, Date: October 15, 2010. Abstract: This case study presents a customer adjustable-speed drive motor winding failure analysis. The study investigated the potential for severe high frequency transient overvoltages at induction motor terminals for an adjustable-speed drive that utilized aContinue reading “Customer Adjustable-Speed Drive Motor Failure Evaluation”

Study of 345 kV Transient Recovery Voltages

Published by Electrotek Concepts, Inc., PQSoft Case Study: Study of 345 kV Transient Recovery Voltages, Document ID: PQS0602, Date: January 1, 2006. Abstract: Transient recovery voltage (TRV) is the voltage across the terminals of a pole of circuit breaker following current zero when interrupting faults. TRV waveshapes can be oscillatory, exponential, cosine-exponential or combinations of theseContinue reading “Study of 345 kV Transient Recovery Voltages”

Common Power Quality Waveform Signatures

Published by Electrotek Concepts, Inc., PQSoft Case Study: Common Power Quality Waveform Signatures, Document ID: PQS0901, Date: October 15, 2009. Abstract: Power quality problems encompass a wide range of disturbances and conditions on utility and customer power systems. They include everything from very fast transients (microseconds) to long duration (hours) outages. Problems also include steady stateContinue reading “Common Power Quality Waveform Signatures”

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”

General Reference – Using Simulations and Measurements in PQ Analysis

Published by Electrotek Concepts, Inc., PQSoft Case Study: General Reference – Using Simulations and Measurements in PQ Analysis, Document ID: PQS0309, Date: April 16, 2003. Abstract: Simulations provide a convenient means to characterize power quality problems, predict disturbance characteristics, and evaluate possible solutions to problems. They should be performed in conjunction with monitoring efforts and measurementsContinue reading “General Reference – Using Simulations and Measurements in PQ Analysis”

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”

Program on Technology Innovation: A History of Power Quality

Addressing Evolving Customer Technologies and an Increasingly Complex Power Grid Published by Electric Power Research Institute (EPRI), Inc. Document ID: 3002022396, March 2022. Introduction Over the past 50 years, the concept of power quality (PQ) has evolved from being an unknown and undefined concept to being understood as a fundamental component of grid performance, utilityContinue reading “Program on Technology Innovation: A History of Power Quality”

General Reference – Approach to Systems Monitoring

Published by Electrotek Concepts, Inc., PQSoft Case Study: General Reference – Approach to Systems Monitoring, Document ID: PQS0310, Date: April 16, 2003. Abstract: Power quality monitoring is an essential service many utilities perform for their industrial and other key commercial customers. Because of the technology and software now available, this monitoring is highly effective. Not onlyContinue reading “General Reference – Approach to Systems Monitoring”