Cable accessories refer to the intermediate connections and terminal connections of various cables in the cable line. Together with the cables, they form the power transmission network; the cable accessories are mainly based on the characteristics of the cable structure, which can not only restore the performance of the cable, but also ensure the extension and extension of the cable length. Terminal connection. According to its purpose, it is generally divided into terminal connections and intermediate connections. Terminal connections are divided into indoor terminals and outdoor terminals. Generally, outdoor terminals refer to open-air cable joints, and indoor terminals refer to the connection of cables and electrical equipment; intermediate connections are divided into straight-through There are two kinds of style and transition style. Two cables with the same insulation structure type are connected to each other as a straight-through type, and two cables with different insulation structure types are connected to each other as a transition type.