Title :
Analysis of Current Unbalance In Transmission Systems With Short Lines
Author :
Kalyuzhny, Aaron ; Kushnir, Gregory
Author_Institution :
Israel Electr. Corp. Ltd., Haifa
fDate :
4/1/2007 12:00:00 AM
Abstract :
The analysis of current unbalance in power systems with short transmission lines is presented. Measurements in the Israel Electric Transmission System as well as numerical simulations of three-phase load flow have revealed lines with a high level of current unbalance. It is found that significant current unbalance on short transmission lines may take place due to the following reasons: inherent asymmetry of untransposed transmission lines;) presence of line traps used for power-line carriers (PLC); electromagnetic coupling between lines on double-circuit towers; superposition of current symmetrical components in lines under light loading. It is shown that the current asymmetry may lead to overcurrents in individual phases of transmission lines as well as to growth of the magnetic field in proximity of the lines
Keywords :
load flow; magnetic fields; numerical analysis; power transmission lines; Israel Electric Transmission System; current unbalance; double-circuit towers; electromagnetic coupling; line proximity; line traps; magnetic field; overcurrents; power line carriers; short transmission lines; three-phase load flow; transmission systems; untransposed transmission line; Current measurement; Electric variables measurement; Fluid flow measurement; Load flow; Numerical simulation; Power system analysis computing; Power system measurements; Power system simulation; Power transmission lines; Transmission line measurements; Asymmetry; current unbalance; magnetic field; sequence currents; three-phase load flow;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2006.883011
