Published by Bronisław TOMCZUK, Dariusz KOTERAS, Jan ZIMON, Andrzej WAINDOK Opole University of Technology, Department of Industrial Electrical Engineering Abstract. The Field-Circuit Method (FCM) and the new Modified Time Stepping Finite Element Method (MTSF) as well as classical Time Stepping Finite Element Method (TSF) have been used for the transient current calculations in transformers. TheContinue reading “Calculation of the Transient Currents in Transformers using Field-Circuits Methods”
Category Archives: Case Studies
Some Results of Research into Harmonics in the High Voltage Networks with Distributed Nonlinear Loads
Published by Lidiia KOVERNIKOVA, Energy Systems Institute of the Siberian Branch of the Russian Academy of Sciences Abstract. The paper presents the results of the analysis of harmonic parameters that were measured at the nodes of connecting railway substations to the feeding network. Traction load is nonlinear, unbalanced and stochastic. The 3-rd and 5-th harmonicsContinue reading “Some Results of Research into Harmonics in the High Voltage Networks with Distributed Nonlinear Loads”
IEEE 519-1992 Compliance
Published by Electrotek Concepts, Inc., PQSoft Case Study: IEEE 519 Compliance, Document ID: PQS0321, Date: October 10, 2003. Abstract: IEEE Standard 519-1992 is a standard that addresses the need for limiting the harmonic current a customer injects onto the utility system. It also protects the customer by specifying maximum harmonic voltage distortion levels that utilities canContinue reading “IEEE 519-1992 Compliance”
PD Pulse Burst Characteristics in Differently Aged Transformer Oils under AC Conditions
Published by JUNHAO LI1, YANMING LI1, GUOLI WANG2, Martin D. JUDD3,State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University (1)Electric Power Research Institute of China South Grid (2)Institute for Energy and Environment, Department of Electronic and Electrical Engineering, University of Strathclyde (3) Abstract. Partial discharge (PD) detection is a technique widely usedContinue reading “PD Pulse Burst Characteristics in Differently Aged Transformer Oils under AC Conditions”
Cable Links Designing in HVAC and HVDC Submarine Power Grids – Selected Issues
Published by Mirosław PAROL1, Sylwester ROBAK1, Łukasz ROKICKI1, Jacek WASILEWSKI2,Warsaw University of Technology, Institute of Electrical Power Engineering (1)PSE Innowacje Sp. z o.o. (2) Abstract. Submarine (offshore) HVAC and HVDC cable power grids are becoming more and more important. The establishment of submarine transmission interconnections between various national power systems and the development of offshoreContinue reading “Cable Links Designing in HVAC and HVDC Submarine Power Grids – Selected Issues”
Study on Transformer Tank Vibration Characteristics in the Field and its Application
Published by Ji SHENGCHANG, Zhu LINGYU, Li YANMING, State Key Laboratory of Electrical Insulation and Power Equipment, Department of electric engineering, Xi′an Jiaotong University Abstract. Vibration signal analysis method is one of effective methods to monitor the condition of transformer windings and core. In this paper, the multi-channels vibration measurement system is set up andContinue reading “Study on Transformer Tank Vibration Characteristics in the Field and its Application”
Testing of LV Switchgear for Powering Cellulose Fiber Breaking Systems
Published by Adam SMOLARCZYK1, Tadeusz DASZCZYŃSKI1, Sławomir FISZER2Warsaw University of Technology, Electrical Power Engineering Institute (1), Elektroteam Sp. z o.o. (2) Abstract. The article describes an innovative low voltage switchgear for use in the pulp and paper industry. The switchgear is an innovative structure designed to supply single-phase systems with significant currents above 1 kA.Continue reading “Testing of LV Switchgear for Powering Cellulose Fiber Breaking Systems”
Harmonic Measurement Data Evaluation
Published by Electrotek Concepts, Inc., PQSoft Case Study: Harmonic Measurement Data Evaluation, Document ID: PQS1001, 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 a harmonic data analysis for a utility 12.47kV substation monitoring locationContinue reading “Harmonic Measurement Data Evaluation”
A Short Review of Energy-Efficient Line-Start Motor Design
Published by Tine MARČIČ1, TECES, Research and Development Centre for Electric Machines (1) Abstract. The paper provides an overview of design problems and contemporary research progress in the currently very interesting field of energy-efficient line-start motors. Discussed are problems related to induction motors (IMs), line-start synchronous reluctance motors and line-start interior permanent magnet synchronous motorsContinue reading “A Short Review of Energy-Efficient Line-Start Motor Design”
New Approach to Protecting Transformers Against High Frequency Transients – Wind Turbine Case Study
Published by Dariusz SMUGAŁA(1), Wojciech PIASECKI(1), Magdalena OSTROGÓRSKA(1), Marek FLORKOWSKI(1), Marek FULCZYK(2), Ole GRANHAUG(3), ABB Sp.z.o.o., Corporate Research Center, Cracow, Poland (1), ABB Oy, Medium Voltage Products, Vaasa, Finland (2), ABB AS, Medium Voltage Products, Skien, Norway (3) Abstract. Novel protection method of wind turbine transformers against high frequency transients occurring during switchgear operation isContinue reading “New Approach to Protecting Transformers Against High Frequency Transients – Wind Turbine Case Study”
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