An overhead cable (also known as an overhead insulated cable) is an overhead conductor with an insulation layer and a protective sheath. It is a specialized cable manufactured using a production process similar to cross-linked cables, and is a new transmission method between overhead conductors and underground cables. Overhead cables are all single core and can be divided into different structures such as 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 corrugated structure (wire core can be hard aluminum or hard copper wire). 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, and inner and outer semiconducting shielding layers. Overhead cables are widely used in power transmission both domestically and internationally.