Studies of the Wet Rope's Melting Damage under the Power Transmission Lines

Abstract

All the phenomena have been solved about the wet rope's melting damage under the power lines. The results are as summarized below. A wet rope acts as a conductor with the same diameter on static induction under the power lines, and if the rope is grounded, the static current is induced on the rope as same as the conductor. The static induction current flowing through the wet rope increases by the ends of the rope, and the half of the induced current on whole rope flows out each end. The cause of wet rope's melting damage under the power lines originates in above-mentioned static induction current, and this damage occurs at the end of the rope which the induction current is maximum. The maximum static induction current, without melting damage to the wet rope is 1mA or less at 12mmφ nylon rope and 5mA or less at 10mmφ aramid rope under 500kV power line. The range (length of the rope, distance between the rope and the power line) on which the wet rope's melting damage occurs can be checked from Table 4 and Fig. 10.