Definition of preformed hardware, helically formed fitting:
As a new substitute product of traditional overhead line hardware, the performed hardware, helically formed fitting is used on the high voltage overhead transmission lines more nowadays. It is consisted of one or several groups of spiral shape preformed armor rods, the shape is made according to the hole section, pitch, length and the number of the roots.
Material of preformed hardware, helically formed fitting: galvanized steel wire, aluminum alloy wire, aluminum clad steel wire.
Preformed hardware classification:
There are mainly four types of helically formed fitting which are used commenly: helical deadend clamp, helical suspension clamp, preformed armor rod, preformed ties for insulator.
Helica deadend clamp: this preformed hardware is used for the installation of the bare wire and serve at the dendend of a pole line. It has simple structure, but due to the novel design it has reliable performance. The clamps are usually made of aluminum-clad steel, galvanized steel and so on.
Helical suspension clamp: this helically formed fitting is used to fix the wire on the high voltage insulator strings or hang the lightning wire. Especially suitable for the line, which voltage is above 220KV, as well as heavy ice area, large span line construction.
Preformed armor rod: The function of this helically formed fitting is to protect the conductor from shock, abrasion and other damage. Preformed armor rod is fixed on the conductor before fixed to the suspension clamp. Preform repair rod can also fix the conductor when it is broken apart, it can be divided as preformed conductor splice, preformed splice for copper stranded conductors, preformed T- splice for ACSR, preformed jump conductor splice, preformed ground wire splice and preformed guy splice.
Preformed ties for insulator: mostly this kind of helically formed fitting is used to tie the conductor or wire to the pin insulator, line post insulator, pin post insulator, you can know more about preformed distribution tie and preformed side tie for pin insulator on other pages of Orient Power website.
