Sky wires can be rolled. Neutral conductors can be rolled. Ice Rolling -Disadvantages Labour intensive. Insulators and conductors can be damaged by the metal roller. Uderbuild circuit interferes with the roller sticks.
Rollers can jam on conductor splices.
As an alternative to using conventional 3-phase AC impedance faults to melt ice off transmission lines, direct current heating may also be employed. Using DC has the distinct advantage of eliminating the reactive losses which limit the distance in conventional melting. By adjusting the timing angles of the thyristor control, it is possible to adjust the amount of current down from a theoretical maximum. A direct current ice melting system may be used on short transmission lines, may reside on a mobile platform for use in many stations, and be used to melt large conductors. Manitoba Hydro reviewed the pros and cons of DC ice melting in the 1980's.