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Night Warning Light

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Used in the neighbourhood of airports and in some valleys or estuary crossings, to signal the presence of high voltage overhead transmission lines at night, the night warning light is now a basic factor of air-traffic safety.

Working principle:

The warning light consists in a neon tube, with one end connected to the live conductor and the other to an auxiliary conductor, located in electric field of live conductor. The difference of potential created between the live conductor and the auxiliary line switches up the lamp and provides a red light. The luminous intensity is upper to : o 10 Cd according to ICAO,
o 32 Cd according to FAA.

Main characteristics:

DERVAUX brought important technical improvements in order to increase the life time of the lamps :
o better damping of mechanical vibrations by using a flexible auxiliary line and adding an elastomer element,
o reduction of electrical inner stresses by use of «sign» type electrodes and double bearing welds,
o reduction of the inner pollution of the tube by use of a water + glycol mixture and silicone sticking which warrants the watertightness,
o decrease of the using voltage of the lamp by reducing the number of turns.

The auxiliary line consists in an AAAC conductor with a specific length related to the voltage of the project.

Various adaptors will meet special applications, such as mid-span suspension for sub-transmission lines or twin auxiliary conductors for distribution lines.

All the DERVAUX aircraft warning devices have been approved by few National Engineering Authority for Air-Transport Worldwide.

Type: 10 Cd

Location:

For your guidance, warning lights are installed on live conductors, at every 70 meters for line sections located under the access area of airports, and at every 105 metres outside this area.

Packing:

Warning lights are delivered in sub-assemblies to simplify the installation.

Type: 32 Cd

Location:

For your guidance, warning lights are installed on live conductors, at every 70 meters for line sections located under the access area of airports, and at every 105 metres outside this area.

Packing:

Warning lights are delivered in sub-assemblies to simplify the installation.

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