Published by Electrotek Concepts, Inc., PQSoft Case Study: Utility Capacitor Switching Fails VAX Disk Drive, Document ID: PQS0408, Date: September 30, 2004. Abstract: The application of utility capacitor banks has long been accepted as a necessary step in the efficient design of utility power systems. Also, capacitor switching is generally considered a normal operation for aContinue reading “Utility Capacitor Switching Fails VAX Disk Drive”
Category Archives: Case Studies
Utility Capacitor Switching Causes Nuisance Tripping of ASD
Published by Electrotek Concepts, Inc., PQSoft Case Study: Utility Capacitor Switching Causes Nuisance Tripping of ASD, Document ID: PQS0319, Date: July 18, 2003. Abstract: The application of utility capacitor banks has long been accepted as a necessary step in the efficient design of utility power systems. Also, capacitor switching is generally considered a normal operation forContinue reading “Utility Capacitor Switching Causes Nuisance Tripping of ASD”
Transient Voltages at an Industrial Facility Capacitor Switching
Published by Electrotek Concepts, Inc., PQSoft Case Study: Transient Voltages at an Industrial Facility Capacitor Switching, Document ID: PQS0505, Date: June 30, 2005. Abstract: This case study describes concerns for capacitor switching transients within customer facilities. Magnification of transients initiated at higher voltage capacitors and tripping of sensitive variable frequency drive (VFD) loads are evaluated inContinue reading “Transient Voltages at an Industrial Facility Capacitor Switching”
Techno-Economic Analysis of Off-Grid Renewable Energy Power Station: A Case Study
Published by Liu Liqun, Liu Chunxia, Taiyuan University of Science & Technology Abstract. This paper gives the techno-economic analysis of a wind-PV-diesel system with storage battery backup for an off-grid power station specially located in Dongwangsha, studying data from a particular site in littoral China. The simulation and optimization results indicated the most optimized sizingContinue reading “Techno-Economic Analysis of Off-Grid Renewable Energy Power Station: A Case Study”
PWM Drive Motor Failures due to Transient Voltages
Published by Electrotek Concepts, Inc., PQSoft Case Study: PWM Drive Motor Failures due to Transient Voltages, Document ID: PQS0404, Date: June 30, 2004. Abstract: In an effort to improve the efficiency of many industrial processes, equipment has been retrofitted with adjustable speed drives (ASDs). The ASDs allow for better speed control, soft starting of motors, andContinue reading “PWM Drive Motor Failures due to Transient Voltages”
Phase-to-Phase Transients at Transformer Terminations During Utility Capacitor Switching
Published by Electrotek Concepts, Inc., PQSoft Case Study: Phase-to-Phase Transients at Transformer Terminations During Utility Capacitor Switching, Document ID: PQS0603, Date: January 1, 2006. Abstract: There are a number of important transient related concerns when transmission capacitor banks are applied. These concerns include insulation withstand level, switchgear capabilities, energy duties of protective devices, and system harmonicContinue reading “Phase-to-Phase Transients at Transformer Terminations During Utility Capacitor Switching”
Impact of Capacitor Bank Outrush Reactors on Circuit Breaker Transient Recovery Voltages
Published by Electrotek Concepts, Inc., PQSoft Case Study: Impact of Capacitor Bank Outrush Reactors on Circuit Breaker Transient Recovery Voltages, Document ID: PQS0906, Date: October 15, 2009. Abstract: Current limiting outrush reactors are often installed with utility transmission capacitor banks. These reactors limit the high-magnitude, high-frequency currents that flow when the capacitor bank discharges into aContinue reading “Impact of Capacitor Bank Outrush Reactors on Circuit Breaker Transient Recovery Voltages”
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”
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