Transposition in transmission line is a technique use to
restore some sore of “electrical voltage drop” and current balance of the
transmission line system. It is only applicable though in three phase system.
It us done by literally, and physically exchanging the conductor position along
the line.
When the conductors of a three phase line are not spaced
equilaterally, which is case often, the flux linkage and inductance of each
phase are not the same. This difference in each phase results in an unbalanced
circuit.
Balance of these phases can be restored by exchanging the
positions of the conductors at regular intervals along the line so that each
conductors occupies the original position of every other conductor over an
equal distance.
A complete transposition cycle is shown below:
Transposition results in each conductor having the same
average inductance over the whole cycle.
Modern power lines are usually not transposed at regular
intervals, although interchange in the positions of the conductors may be made
at switching stations, in order to balance the phases more closely.
More transposition tutorial and pdf download links below:
TRANSMISSION LINE TRANSPOSITION
According to existing concept the transposition of
transmission line phases is intended for reducing the unbalance of current and
voltage in normal operation mode of electric system and for limiting the
obstructive influence of transmission lines to low-frequency transmission
channel. Read more...
RESONANCE EFFECT DUE TO CONDUCTOR TRANSPOSITION IN THREE
PHASE POWER LINES
This paper is concerned with the effects produced by
conductor transposition in long overhead three phase power lines. Consideration
of these resonance phenomena is of major importance and should be taken into
account in a variety of situations. Read more...
2 comments:
Thanks a lot....... To provide me such a good tutorial.
informative
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