Abstract: With the continuous expansion of China's urban power grid, the rapid growth of electricity load and the need to improve the reliability of power supply and the need to solve the problem of tree touch wires, more and more urban and rural distribution networks use overhead insulated wires. The disadvantages of overhead insulated conductors are discussed, while the disadvantages of overhead insulated conductors are highlighted. For example, the sealing is not tight and the water is easy to intrude; the extrusion force is too large, the core of the conductor is deformed, and the breaking force becomes smaller; overhead insulated conductors In the case of a lightning strike, the line breaks; A series of preventive measures have been formulated for the problem of disconnection of overhead insulated conductors.