They are to make the high tension wires visible from a distance.
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That is to warn birds so that large flock of birds do not fly into the power lines. Also helicopters.
Capacitors have always been added on both power lines and telephone lines to compensate for the build up of inductive reactance in long runs of wire.
Power lines run at high voltages to overcome line loss.
Power lines and electronic equipment: 150m
The mass of ice forming on the power cables becomes too great for the lines to support and so they snap.