Self-supporting cable is used in cases where the use of lines with bare overhead conductors leads to accidents and life-threatening or when it is not possible to observe the privacy of power lines and other technical and safety points of the power network. One of the most important of these cases is the paths that have a small width or in which there are obstacles such as rows of trees.. One of the types of this wire and cable is the self-supporting cable 5 The string pointed out.
Self-supporting cables have aluminum conductors and cross-link polyethylene insulation, and a support wire is needed to install these cables on the bases. (massenger) This wire is made of steel for high pressure cables and aluminum alloy for low pressure cables . In low pressure self-supporting cable, the supporting wire is also used as a neutral wire .
Generally speaking, these cables are used to supply and distribute electricity in airlines with high efficiency and low cost.
This type of cables are produced in two groups of five-strand and six-strand self-supporting cables .
Conductor in self-supporting cable 5 The string is made of hard drawn, twisted and compressed aluminum ( AAC ) It is in accordance with the international standard ASTM B231 . Also, the neutral conductor and messenger of these products are made of aluminum alloy ( AAAC ) is .
the door Self-supporting cables of six strands The phase conductor is made of hard drawn and pressed aluminum ( AAC ) It is in accordance with the international standard ASTM B231. Also, the messenger of this type of cable is made of seven strands of high-carbon galvanized steel twisted wire. .
The structure of this type of cables consists of three strands of wire with the same cut surface as a phase made of pure aluminum (99.5%) And one thread as lighting from the same material and one thread as a holding null at the same time made of aluminum alloy (magnesium, silicon) Composed.
How to determine the cable size of the self-supporting cable 5 The string is as follows:
(Noel / the keeper) + (Illustrated) + (Phase) 3x All disciplines with materials (TIX-5) From the polyethylene family, they are insulated in black, and after insulation, they are crosslinked under high temperature and steam pressure.. In this cable, the neutral strand of the holder is in addition to the role of the neutral conductor (Noel) It is responsible for maintaining the weight of the cable handle at the installation site.
The insulation of the phase, lighting and neutral strands in the self-supporting cables is made of black XLPE cross-linked polyethylene, and for the messenger strand, it is made of high-density polyethylene HDPE. .
In Iran, self-supporting cables based on the specifications announced by Tavanir Company are produced and supplied .
Simkan, the largest wire and cable producer in Isfahan province
