Aerial self-supporting cable For the first time in a year 1955 In France, they were used to replace low voltage networks with wired conductors and found a suitable user position due to their numerous advantages.. French companies have played an important role in expanding the use of this type of cable. And today this type of cable is widely used in many countries of the world, the history of using this type of cable in Iran is not very long.
In the past few years, the self-sustaining cable has been greatly welcomed and widely used in Iran's power grids. This type of cable has good advantages, but failure to comply with technical issues in use and operation can cause other problems.
The main advantages of using self-supporting cable in aerial electricity distribution networks
Allocated voltages for this type of cables in weak pressure 1 / 0.6 and medium pressure 20 / 12 is.
Indications
Low tension self-supporting cable:
Self-supporting cable is a new concept for power distribution through overhead lines . Compared to uncoated wires used in airlines, self-supporting cables have higher reliability and safety.. One of its most important advantages is the lower electrical losses and the cost-effectiveness of these cables in order to reduce installation and maintenance costs. . Also, these cables can be used to distribute power in urban or rural areas, mountainous, forest or coastal areas..
Medium pressure self-supporting cable:
Medium pressure self-supporting cables for distribution of electrical energy through overhead lines with rated voltage 6 until the 30 kilovolts are used. These cables are also used in public and industrial networks and installed on electric poles, tunnel walls, etc..
Self-supporting cable medium pressure single insulated overhead lines as three strands of single-phase cable wrapped around a strand of supporting steel wire. (or messenger) It is bare, so to speak, the cable is twisted in the air (ABC)is.
In Iran's standard, only medium pressure self-supporting cable network type with metal shield (The shield is grounded) It is defined that they can be used at nominal voltage levels of 20, 11 and 33 kV.
Notice
In some regions of the country, there is a medium voltage network of 11 kV. that in order to enable future development and prevent the variation of voltage levels, the standard of 20 kV self-supporting cables will be used in those lines.
It is worth mentioning that due to the problems caused by the use of bare conductors and the dangers and accidents caused by it, including weather conditions, temporary and permanent short circuits, the impact of tree branches, injuries caused by animals and birds, and chemical corrosion that can lead to power outages. and to increase undistributed energies, the approach to sheathed conductor and self-supporting cable can be very effective.
