Experimental study on wear mechanism of wire with pre-stranded anti-vibration hammer

The anti-vibration hammer is widely used to eliminate the breeze vibration of overhead transmission lines' grounding grid. According to the type of wire clamp, the anti-vibration hammer can be divided into bolt and pre-stranded types. The traditional bolt-type vibration hammer is easy to run on the wire due to the loosening of the fastening bolt. Recently, the pre-stranded anti-vibration hammer has gained recognition by construction and transportation inspection units due to convenient installation, anti-running and maintenance-free. Due to the anti-running characteristics, the wear on wire is difficult to be detected only after opening the wire clamp on the tower. If the early wire wear of the pre-stranded hammer is not found in time, the wear will be accelerated in the later stage, leading to breakage. In this paper, the influence of pre-stranded wire number, diameter, pitch and other parameters on the occurrence of wear phenomenon is analyzed by testing typical wire and pre-stranded hammer. The experimental comparison with bolt type vibration hammer is carried out, and the mechanism of wire wear by pre-stranded vibration hammer is studied.