The steel retaining plate has two functions, retaining the bushing and preventing rod rotation.
固定板的钢具有两种功能，保留套管和防止杆旋转。
2
The old materials of the bushing have some defaults including bad wear-resistance property, serious wear to the steel cable and high price.
以往的衬套材质存在耐磨性差、对钢丝绳磨损严重以及成本过高等缺点。
3
Fix insulated copper tubular busbar on the steel framework directly and remove wall bushing and supporting insulator. It has strong vibration resistance.