Airfield Lighting Cable
Regarding the Airfield Lighting cables, Nexans proposes a complete range of Primary, Secondary and Remote control cables. The Primary is used between Constant Current Regulators (CCRs) and transformers, the Secondary between transformers and lights, and the Remote control between Control Tower and Constant Current Regulators (CCRs). These cables have been installed for many years in many Airports or Air Bases all over the world.
400 Hz Introduction
400 Hz cables are used for the power supply of aircraft, computer systems and radar stations.
The engines of aircraft are stopped while the aircraft are stationary, in order to save fuel as well as to decrease noise level and the quantity of exhaust gas at the airport . All international airports offer a 400 Hz supply voltage for stationary aircraft.
Due to safety reasons computer systems, radar equipment and communication systems of airports are connected to uninterruptable power supply plants via 400 Hz cables. With that, a total power failure is prevented, and frequency and voltage fluctuations are compensated. Nexans manufactures these interconnection cables for many different applications.
The 400 Hz network can be designed as a central, decentralized stationary or mobile system. The 400 Hz board supply requires cables and special plugs.
For distance up to 150 m a transmission voltage of 200/115 V is used. A higher voltage is chosen for larger plants with larger distances (600V up to 600m and 950V for more). For those plants a transformer is installed as near as possible to the aircraft (e.g at the end of the passager bridge) which reduces the supply voltage down to the board voltage of 200/115V.
400 Hz Cables
All cables can also be supplied in a halogen-free RHEYHALON® design.
With 4 core cables voltage asymmetries and higher inductive voltage drops occur in 400 Hz networks when high ratings are transmitted. These unfavorable cable characteristics can be improved by using 7 core cables.
In those cables the centre core is used as earth or neutral conductor (green-yellow or blue), and six cores with the same cross section (black with white numbers) are laid in one layer round the centre core. Two opposite located cores are switched in parallel to one phase conductor.
400 Hz cables are directly buried or laid in buildings. RHEYHALON® designs are only suitable for indoor installation, cables with a PE sheath only for direct burial.
Flexible 400 Hz Cables
Flexible 400 Hz cables can also be supplied with control cores and special screening.
Flexible 400 Hz cables are used :
- between the fixed installated cable network, outside at the passager bridge or within the cladding, from the building to the front of the passenger bridge,
- as board supply cable from the end of the passenger bridge to the aircraft. Depending on the individual location the cable is wound or reeled. If required, these cables have additional control cores for controlling the voltage level (readjustment of the supply voltage) and for the up-and-down setting of the reeling equipment,
- as interconnection cable between the mobile power supply unit and the aircraft.
Flexible 400 Hz cables are also installed in inspection and maintenance halls.
Application for trailing cables
The lengths used are normally 10-25 m long. 400 Hz trailing cables, made by NEXANS, are highly flexible and withstand extreme environmental stresses.