Aerial cable (also known as overhead insulated cable) is a special type of cable manufactured using a production process similar to cross-linked cables, which is an overhead wire with an insulation layer and protective sheath. It is a new transmission method between overhead wires and underground cables. Overhead cables are all single core and can be divided into hard aluminum wire structure, hard drawn copper wire structure, aluminum alloy wire structure, steel core or aluminum alloy core support structure, and self-supporting three core laminated structure (the wire core can be hard aluminum or hard copper wire) according to their different structures. It has the main characteristics of high power supply reliability, good power supply safety, convenient installation and maintenance, and reasonable economy. Its main technical parameters include weather resistance, insulation level, inner and outer semi conductive shielding layers. Overhead cables are widely used in power transmission both domestically and internationally