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overhead transmission line sag and tension calculation filetype ppt


Posted by:
Created at: Sunday 07th of October 2012 02:05:55 PM
Last Edited Or Replied at :Monday 08th of October 2012 03:18:00 AM
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ppt file of overhead transmi..................[:=> Show Contents <=:]



SIMULATION OF EXTRA HIGH VOLTAGE LONG TRANSMISSION LINES


Posted by: seminar class
Created at: Wednesday 09th of March 2011 02:52:32 AM
Last Edited Or Replied at :Sunday 04th of September 2011 10:48:28 PM
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t at the input port, and voltage and current at the output port, so that the two-port network can be treated as a black box modeled by the relationships between the four variables Vs, Is, Vr and Ir. There exist six different ways to describe the relationships between these variables, depending on which two of the four variables are given, while the other two can always be derived.
Note: All voltages and currents below are complex variables and represented by phasors containing both magnitude and phase angle.
The parameters used in order to describe a two-port network are the following:
Z, ..................[:=> Show Contents <=:]



Upgradation of Existing EHVAC Line by Composite AC-DC Transmission


Posted by: seminar surveyer
Created at: Saturday 02nd of October 2010 12:14:56 AM
Last Edited Or Replied at :Saturday 02nd of October 2010 12:14:56 AM
ehvac, ehv ac transmission , ehv ac transmission system, ehv ac , ac dc, ac motor , ac generator, ac current , transmission media, transmission lines , transmitter, transmission and distribution , transmission electron microscope, transmac , transmission system, transmittance , Transmission, AC DC , Composite, Line , EHVAC, Existing , Upgradation, ac dc composite transmission lines ppt , selection of ehv ac transmission line, upgradaion ac ansmision lines , upgradtion of existing ehvac line by composite ac dc t m, simulatenous ac and dc transmission pdf , latest ehv ac transmission line ppt 2012, abstract ehvac lone by composite ac dc transmission system , ehvac transmissiom lines, simultaneous ac dc power transmission ppt , ppt on ehv ac dc transmission system, seminar projects on composite ac dc , ppt on composite ac dc, implementation of upgradation of existing ehvac line by composite ac dc transmission , ac dc power transmission for existing ehvac lines, project report on ehv ac and dc transmission ,
roposed concept of simultaneous ac-dc power transmission enables the long EHV ac lines to be loaded close to their thermal limits. The conductors are allowed to carry certain amount of dc current superimposed on usual ac. This paper presents the power up gradation of existing EHV ac line corridor by converting it into composite ac-dc power transmission line. No alterations of conductors, insulator strings or towers of the original line are needed. Simulation study is carried out on PSCAD/EMTDC software package. Index Terms—Power Upgrading, EHVAC Corridor, Simultaneous AC-DC Transmission,
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ULTRA HIGH VOLTAGE TRANSMISSION


Posted by: computer science topics
Created at: Sunday 27th of June 2010 09:16:40 PM
Last Edited Or Replied at :Sunday 27th of June 2010 09:16:40 PM
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significant problems up to a compensation of around 70 percent. At higher levels of compensation the system will be less robust 1 .


fig.1. The capability of an AC line degrades with increasing length: This graph is for a1000 kV line with max. 70 percent compensation and 30 degree angle between terminals

When a line is loaded below SIL (surge impedance loading) it will produce reactive power; if shunt compensation is not added the voltage can rise excessively. If the line is loaded above SIL, it will consume reactive power and the voltage can drop too far. From a reliability point of ..................[:=> Show Contents <=:]



HVDC TRANSMISSION SYSTEMS


Posted by: project topics
Created at: Friday 02nd of April 2010 04:53:56 AM
Last Edited Or Replied at :Wednesday 07th of November 2012 11:36:52 PM
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llmana Svenska Electriska Aktiebolaget (ASEA), an improved multi-electrode grid controlled mercury arc valve for high powers and voltages was developed from 1929. Experimental plants were set up in the 1930â„¢s in Sweden and the USA to investigate the use of mercury arc valves in conversion processes for transmission and frequency changing. D.C. transmission (HVDC) now became practical when long distances were to be covered or where cables were required. The increase in need for electricity after the Second World War stimulated research, particularly in Sweden and in Russia. In 1950, a 116..................[:=> Show Contents <=:]



protection of transmission line by using GPS


Posted by: ibrahim
Created at: Monday 01st of March 2010 10:21:26 PM
Last Edited Or Replied at :Friday 20th of January 2012 11:24:31 PM
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i want to full detail about protection of transmiss..................[:=> Show Contents <=:]



protection of transmission system by gps


Posted by: aiyappa m.t
Created at: Thursday 04th of February 2010 04:00:06 AM
Last Edited Or Replied at :Saturday 25th of September 2010 05:41:22 AM
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plz give me some detailed in..................[:=> Show Contents <=:]



wireless power transmission


Posted by: Electrical Fan
Created at: Thursday 15th of October 2009 02:58:39 AM
Last Edited Or Replied at :Friday 21st of December 2012 11:39:51 PM
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that takes place in any system where electrical energy is transmitted from a power source to an electrical load, without interconnecting wires. Wireless transmission is useful in cases where instantaneous or continuous energy transfer is needed, but interconnecting wires are inconvenient, hazardous, or impossible.While the physics are identical, wireless energy transfer is slightly different from wireless transmission for the purpose of telecommunications (the transferring of information), such as radio, where the signal-to-noise ratio, or the percentage of power received, becomes critical if..................[:=> Show Contents <=:]



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