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Methods of reducing magnetic field near the transmission lines
, Article Amirkabir (Journal of Science and Technology) ; Volume 14, Issue 55 A , 2003 , Pages 610-630 ; 10150951 (ISSN) ; Porkar, S ; Vahidi, B ; Sharif University of Technology
2003
Abstract
Due to biological effects of magnetic fields of high voltage transmission lines and induceed effects on gas pipe line, telecommunication system and inteference with sensitive electronic equipment, many effort have been done to reduce transmission lines magnetic fields and several ideas have been introduced. In this paper we review three methods: phase split, shielded and compacted line methods. With aid of a developed software programme these methods are then applied to transmission lines and the results are analyzed
Calculation of transient electromagnetic field around a transmission line subjected to lightning strokes
, Article 2003 IEEE Power Engineering Society General Meeting, Toronto, Ont., 13 July 2003 through 17 July 2003 ; Volume 1 , 2003 , Pages 258-261 ; 0780379896 (ISBN) ; Porkar, S ; Jahromi, A. N ; Sharif University of Technology
2003
Abstract
In this paper, a new method for the calculation of electromagnetic fields around a transmission line subjected to a lightning strike is described and discussed. The electric fields and magnetic fields are presented graphically as a function of spatial coordinate, as a function of time and as a function of both. It is believed that this exact solution have not been published before. First, a double exponential lightning surge current is injected into a transmission line. Once The temporal variations of current is known, then electric and magnetic fields can be calculated by using the field expressions for electric dipoles over infinitely conducting ground. As the calculation was done for each...
Competitive distribution system planning model integration of dg, interruptible load and voltage regulator devices
, Article Iranian Journal of Science and Technology, Transaction B: Engineering ; Volume 34, Issue 6 , 2010 , Pages 619-635 ; 10286284 (ISSN) ; Porkar, S ; Abbaspour Tehrani Fard, A ; Poure, P ; Saadate, S ; Sharif University of Technology
Abstract
Distribution systems management is becoming an increasingly complicated issue due to the introduction of new technologies, new energy trading strategies, and new deregulated environment. In the new deregulated energy market and considering the incentives coming from the technical and economical fields, it is reasonable to consider Distributed Generation (DG) as a viable option to solve the lacking electric power supply problem. This paper presents a mathematical distribution system planning model considering three planning options to system expansion and to meet the load growth requirements with a reasonable price as well as the system power quality problems. DG is introduced as an...