Adverse Peculiarity Arising with Overhead Power Lines
Abstract
In the paper, the power lines with flat arrangement of phases are considered. At the end of untransposed power lines, the unbalanced voltage appears. As an alternative to transposition, unbalanced load can be applied. Considerable difference of phase loads is the shortcoming of this method. A special increase of mutual inductance among outer phases would be a proper alternative if the way of its implementation would be found. Zero sequence is smaller for the line with overhead ground wires (OGW), especially when OGW is above the middle phase. Parallel lines have considerable mutual Fortesque impedances of all sequences, the most of them being zero sequence. The impact of parallel lines can be weakened by additive measures. Fault analysis of untransposed lines can be reduced to that of transposed.
Keywords: |
Parallel power lines; relay protection; transmission line; transposition; unbalanced voltage.
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DOI: 10.7250/pee.2016.011
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