Exploration and prospect of pre-stretched metal fittings for power lines

Pre-stretched hardware has long been used abroad. The construction is convenient and the protection of the wires is also very good. Under the existing technology, it should be vigorously developed. However, due to the pre-twisted production process in China still needs improvement, due to the unstable quality of the domestic wire manufacturers, for reasons of safety, the pre-twisted length is increased to accommodate the wire and other reasons, which has imposed constraints on its development.

In fact, the pre-stretched metal fittings can play a very good protection and protection role for the wires. The wire clamps are not subject to mechanical damage in the wire clamps, and have little damage to the wires and have a certain shockproof effect. Due to the low level of production technology in the country, it is not recommended for large-diameter wire conductors such as Beijing PLP strain-resistant clamps to be more than 300 wires. However, with the development of technology, the production process of domestic PLP is close to the international leading level. After the transformation of the production equipment of Shenzhen Huaibo, it can basically reach the international level. For example, in the short-term LGJ-300/40 electric power project in Nanjing, pre-twisted metal fittings were used by Hubert, and passed the type test of Nanjing Electric Power Test and Inspection Center. As for other domestic pre-twisted manufacturers, due to their different production processes, there are great restrictions on the production equipment, so choose the power of pre-twisted products with caution.