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Why phases in transmission line are transposed?


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Transposition means exchanging of the position of the transmission line after equal distances. Even if the voltage across the conductors are equal during the transmission, there will be slight differences and will result in varied inductances of the conductors. Hence if we have symmetrical conductors running through transmission line in a similar fashion, there may be unbalances in voltage. Also mutual inductances vary for untransposed lines.

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AC transmission lines are 3-phase, DC transmission lines don't have phases. It doesn't matter where they are from.

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To avoid inteference between communication lines

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A symmetrical fault is a fault where all three phases are experiencing the same thing. This is also called a three phase fault, since all three phases are involved.

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I accidentally transposed the second and third numbers in the sequence.


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