These cables are used in energy to transit of electricity between transformer stations and receivers, to supply households and in other places where the cable routing in the ground is restricted or a cost of an underground line is high. The cables are supported on pillars.
The working core of the overhead insulated cables is carried out in the constructions of single- and multi-cord of aluminium or aluminium alloy. Insulation can be made of cross-linked polyethylene, resistant to flame spreading. Depending on the cable types and the applied standards, it is also possible to use the cables with polyvinyl insulation.
The maximum temperature of a core for long-term load: 90°C
The maximum temperature of working core for short circuit lasting 5 sec: 250°C
Temperature of cables installation: to -20°C
EX based on NEN 73.77 - aluminium cores (AL) in insulation of thermoplastic polyethylene (PE)
ABC based on BS 7870-5 - aluminium cores (AL) in insulation of cross-linked polyethylene (XLPE)
ABC based on NF C 33-209 - harness cables with aluminium cores or mostly with a combination of aluminium wires and supporting alloy (Al-Mg-Si), insulated with cross-linked polyethylene (XLPE)
XOO-A; XOO/O-A based on Jus N.C5.250 - phase aluminium cores, zero made of aluminium alloy Al-Mg-Si, insulation made of cross-linked polyethylene (XLPE)
AMKA based on SFS 2200 - phase aluminium cores, zero Al-Mg-Si, insulation made of cross-linked polyethylene (XLPE)
NFA2X based on DIN VDE 0274 - aluminium cores in insulation made of cross-linked polyethylene (XLPE)
AsXSn based on ZN-TF207:2007 - aluminium cores in insulation made of cross-linked polyethylene (XLPE)
In Russia, there are SIPs, in the USA - Triplex, Quadruplex etc.
The overhead high-temperature cables - middle voltage lines with cables insulated with cross-linked polyethylene in the system of PAS AALXSn 20/24 KV PAS: SFS 5791
The overhead insulated cables with multi-core wires made of aluminium alloy ensure the highest possible to achieve mechanical properties while maintaining high electrical parameters. They are used in medium voltage electricity transmission system. Due to insulation made of cross-linked polyethylene, the usable properties are improved compared to bare overhead cables, including:
momentary contact with each other due to wind, cables installed in parallel, this does not damage the line, or disrupt in energy supply,
do not involve the risk of electric shock of people and animals and fire ground in the event of unexpected contact of the cable with the ground,
they can be installed in forests and wooded areas in a narrow strip of cut down tress (in the case of bare cables, a strip of cut down trees is larger due to the need to minimise the risk of contact with of tree branch with the line).
AALXSn 20/24 KV PAS: SFS 5791
- CCSTWK GREENPAS: a new generation of electricity conductors to the overhead lines based on EN 50397-1
GREENPAS cables produced by TELE-FONIKA Kable have a unique triple layer structure of insulation. The core is a core made of Al-Mg-Si alloy, which is sealed with special swelling powder that acts as a barrier preventing from longitudinal moisture migration. A semi-conducting layer imposed on the core is responsible for uniform distribution of the electric field. The next insulating layer is thermoplastic polyethylene LDPE. The external cover is made of polyethylene HDPE, thermoplastic, resistant to UV and atmospheric factors. Through the use of thermoplastic polyethylene, it is possible to fully recycle the cable materials after the period of use. Compared to traditional PAS cables (with one insulating layer), GREENPAS cables, due to triple layer structure of insulation, have a higher strength of the insulation and resistance to incomplete discharge and sliding discharge, and therefore they are much less prone to failures and ensure a longer period of safe operation than PAS cables.
CCSTWK – GREENPAS based on EN 50397-1