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The Air

cat July 3rd, 2017 by Virtual Keeper

Polyurethane insulation spread of fire in the Ostankino TV tower in a top-down was caused by discharged molten plastic envelope feeders. In laboratory conditions, the flame propagation velocity was 0.25-0.50 m / min in a fire at the TV tower, because of the high bulk temperature, propagation velocity increased by 2-4 times, while falling down a drop of burning polyethylene created secondary fire. Because of the high temperature in the hearth fire and high heat conductivity of copper veins antenna feeders, fire protection was not effective. As a fire-protection paint used for plastic shell feeders and surface insulation fiberglass cloth. Fire protection design sag and fell under intense burning polythene inside.

In addition to the active burning feeders that had flammable outer polyethylene shell, the contribution made as the combustion of other cables that were exposed flame retardants. Modern cables are manufactured with XLPE insulation and are used in networks of different voltage class (500 kV). The use of cross-linked polyethylene provides high dielectric properties of insulation, high mechanical properties, higher than with paper-oil insulated thermal modes, reliability and durability of the cables. Isolation of polytetrafluoroethylene (PTFE), Rubber insulated oil-filled cables oil-filled cables – a cable with an excess pressure created by oil, which is part of the paper soaked insulation, and provided for compensation of temperature changes in the volume of oil. Oil-filled cable in the pipeline – this oil-filled cable with separately shielded wires, enclosed in line that wraps. The development of cable fires in areas with oil-filled cables in tunnels under equal conditions of gas exchange is more intense than in the air laying cables.

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