protection of transmission lines using gps full report
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 hanra Active In SP Posts: 1 Joined: Aug 2010 01-08-2010, 07:27 AM thank you. this was very helpful.
 seminar class Active In SP Posts: 5,361 Joined: Feb 2011 18-03-2011, 10:54 AM   new1.ppt (Size: 2.06 MB / Downloads: 415) introduction  A new technique for the protection of transmission systems.  Relays are installed at each bus bar in a transmission network.  Relay contains a fault detection system together with a communication unit.  Relay determine the location of the fault. Faults A fault is any abnormal flow of electric current Possible causes of faults  Lightning strikes near line  Snow storms/icing on lines (can cause lines to sag)  High winds  Bird or other animal contact •Conductor clash Location of faults[/b]  Save time and resources for the electric utility industry.  Determine “distance to fault” from a transmission line end.  Aid in fast restoration of power.  Communication systems can retrieve fault location information. TRAVELING WAVE FAULT LOCATION THEORY  Traveling wave fault locators make use of the transient signals generated by the fault.  Fault location is determined by accurately time tagging the arrival of the travelling wave at each end of the line and comparing the time difference to the total propagation time.  Precisely synchronized clocks are the key element in the implementation of this fault location technique.  The propagation velocity of the traveling wave is roughly 300 meters per microsecond which in turn requires the clocks to be synchronized with respect to each other by less than one microsecond.  The voltage and current at any point x obey the partial differential Equations  ∂e/∂x = - L ∂i/∂t  ∂i/∂x = - C ∂e/∂t  Where L and C are the inductance and capacitance of the line per unit length. The solutions of these equations are  e(x, t)=ef(x-vt) + er(x+vt)  i(x, t)=1/z ef(x-vt) - 1/z er(x+vt) Where Z = Ö(L/C ) is the characteristic impedance of the transmission line and V=1/Ö(LC) is the velocity of propagation. Forward (ef and if) and reverse (er and ir) waves. Wave amplitudes are represented by reflection coefficients ka and kb which are determined by characteristic impedance ratios at the discontinuities x = {l – c( τa – τb )}/2 ‘X’ is the distance to the fault from a substation,τa and τb represent the travel time from the fault to the discontinuity, ‘l’ is the length of the line, ‘c’ is the wave velocity. WHAT IS GPS?  Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit.  2D & 3D positioning is possible  Allows precise determination of location, velocity, direction and time
 smart paper boy Active In SP Posts: 2,053 Joined: Jun 2011 27-07-2011, 02:03 PM   Protection Of Transmission Line Using GPS.ppt (Size: 3.73 MB / Downloads: 340) LOCATION OF FAULT Save time and resources for the electric utility industry. Determine “distance to fault” from a transmission line end. Aid in fast restoration of power. Communication systems can retrieve fault location information. WHAT IS TRAVELING WAVE FAULT LOCATION? Faults on the power transmission system cause transients that propagate along the transmission line as waves. These waves have a propagation velocity & characteristic impedance , travel from fault location towards line ends The location of faults is accomplished by precisely time-tagging wave fronts as they cross a known point typically in substations at line ends. Fault location can then be obtained by multiplying the wave velocity by the time difference in line ends.
 seminar addict Super Moderator Posts: 6,592 Joined: Jul 2011 21-01-2012, 10:54 AM to get information about the topic protection of transsmission line by using gps full report ,ppt and related topic refer the link bellow topicideashow-to-protection-of-transmission-lines-using-gps-full-report topicideashow-to-protection-of-transmission-lines-against-lightning-using-arrestors
 guddan Active In SP Posts: 2 Joined: Jan 2012 27-01-2012, 12:33 PM wanna get my seminar and presentation reports wanna get my seminar and presentation repor on my topic seminar and presentation report on protection of transmission lines by using gps
 seminar paper Active In SP Posts: 6,455 Joined: Feb 2012 15-02-2012, 11:41 AM to get information about the topic protection of transmission system using global positioning system full report ,ppt and related topic refer the link bellow topicideashow-to-protection-of-transmission-systems-by-using-the-global-positioning-system topicideashow-to-protection-of-transmission-lines-using-gps-full-report
 seminar paper Active In SP Posts: 6,455 Joined: Feb 2012 15-02-2012, 12:52 PM to get information about the topic protection of transmission system by GPS full report ,ppt and related topic refer the link bellow topicideashow-to-protection-of-transmission-lines-using-gps-full-report topicideashow-to-a-gps-synchronized-current-differential-protection-of-transmission-lines topicideashow-to-protection-of-transmission-lines-using-gps-full-report?page=2 topicideashow-to-protection-of-transmission-systems-by-using-the-global-positioning-system
 seminar paper Active In SP Posts: 6,455 Joined: Feb 2012 02-03-2012, 10:41 AM to get information about the topic new technique for the protection of transmission line network full report ppt and related topic refer the link bellow topicideashow-to-protection-of-transmission-lines-using-gps-full-report topicideashow-to-protection-of-transmission-lines-using-gps-full-report?page=2