Lightning protection measures. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Lightning protection measures. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Lightning protection

During a thunderstorm, everyone must observe precautionary measures. If a thunderstorm caught in the field, then you can’t run, but you need to sit down or lie down on the ground or in a small depression on the hillside.

When you are in a forest during a thunderstorm, you should not hide under tall trees, you need to stand in the middle between two trees located at a distance of 15-20 m from each other. Metal objects (shovels, crowbars, saws, etc.) should not be in your hands. ).

When driving in a car in a field during a thunderstorm, you should stop, get out of the vehicle and move away from it at a distance of 25-50 m. During a thunderstorm, as well as when it approaches, all windows, doors, vents, chimneys should be closed in the room and stay from the wires of the internal network, light bulbs, switches, socket outlets at a distance of no closer than 0,5 m. The plugs of electrical receivers must be removed from the socket outlets.

Protection against the introduction of high potentials into buildings and structures via overhead lines with a voltage of up to 1000 V is carried out as follows. To protect people in the premises from lightning discharges in areas with one-story buildings near overhead lines that are not shielded by tall buildings, industrial pipes, tall trees, etc., it is necessary to create lightning protection grounding devices. They must be connected to the pins and hooks of the insulators of the overhead line support, on which grounding is performed, as well as the neutral wire of the network.

Depending on the intensity of thunderstorm activity, the following distances between adjacent lightning protection grounds are accepted: 200 m - for areas with average thunderstorm activity (from 10 to 40 hours per year), 100 m - for areas with increased thunderstorm activity (more than 40 hours per year).

The resistance of lightning protection grounding to the spreading of industrial frequency current should not exceed 30 ohms.

Author: Korshevr N.G.

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