Title :
Calculating short-circuit currents in distribution systems via numerically computed Thevenin equivalents
Author :
Dilek, Murat ; Broadwater, Robert ; Sequin, Richard
Author_Institution :
Electr. Distribution Design Inc., Blacksburg, VA, USA
Abstract :
Distribution system circuit topologies, connections, and equipment pose interesting challenges to system analysts. An approach based upon fundamental circuit analysis principles to calculating fault currents of various types is presented. The basic approach consists of obtaining the prefault phase voltages and a phase Thevenin matrix at the fault location, and using the phase Thevenin matrix to solve the equations imposed by the boundary conditions of a given fault. The approach requests services from a multiphase power flow software component and a circuit model software component. The approach works for both radial and looped distribution systems. The analysis can evaluate fault currents at a node regardless of whether it is three-phase or nonthree-phase and grounded or ungrounded. Experience obtained from solving circuits with more than 5000 nodes will be reviewed.
Keywords :
fault location; load flow; power distribution faults; power system analysis computing; short-circuit currents; Thevenin matrix; boundary condition; circuit model software component; distribution system circuit topology; fault current; fault location; looped distribution system; multiphase power flow; prefault phase voltage; radial distribution system; short-circuit current; Boundary conditions; Circuit analysis; Circuit faults; Circuit topology; Distributed computing; Equations; Fault currents; Fault location; Load flow; Voltage;
Conference_Titel :
Transmission and Distribution Conference and Exposition, 2003 IEEE PES
Print_ISBN :
0-7803-8110-6
DOI :
10.1109/TDC.2003.1335075