Design and experimental validation of an active-clamping anti-slip trolley device for high-voltage transmission lines

Abstract

To address the slipping problem of trolley blocks during live-line work on high-voltage transmission lines in the Sichuan-Chongqing region, an active-clamping anti-slip trolley device based on a worm-gear transmission system is designed. The device provides a clamping force of 500 N with self-locking capability. A 110 kV three-phase electric field simulation shows that the maximum field strength on the device surface is 0.9395 kV/mm, below the corona threshold. Contact stress simulation examines the effects of geometric parameters on the contact stress, with the results indicating that a larger outer radius coefficient and wrap angle contribute to lower stress levels. Experimental validation shows that the self-locking condition is satisfied under dry, lubricated, and worn conditions, with measured friction angles of 3.2°, 2.6°, and 2.1°, all exceeding the lead angle of 1.8°. Static analysis shows that the 500 N clamping force is sufficient for slopes up to 45°, but insufficient for 60° slopes. The results indicate that the device offers active controllability and reliable self-locking, with preliminary evidence of electrical safety and conductor friendliness.