The most appropriate way of mitigating the problem of interference
between power line and communication line is to :
transpose the power line
transpose the communication line
use double circuit power line
use bundled conductor power line
transpose the power line
If 
line conductors are
not equidistant from each other, the flux linkages and inductance of each phase
are not same. The different inductance in each phase results in unequal voltage
drops. In order to make equal the voltage drops we generally interchange the
position of the conductor at regular interval along the line which is called as
transposition. Transposition is done to reduce the radio interference of line
with communicating line.
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