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
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