figure of automatic weight tensioning
Advantages of automatic weight tensioning and temperature compensation:
Sparkless current collection at higher speeds.
OHE becomes more dynamically stable under all atmospheric conditions
Reduction in wear of both contact wire and pantograph collecting strips.
Creep of conductors with passage of time is automatically taken up by the tensioning device.
Only one critical velocity of propogation of waves in contact wire which is greater than that of unregulated OHE.
Because of fixed tension, fluctuations in the height are minimized