Peat electrical installations. Overhead power lines

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 7. Electrical equipment of special installations

Peat electrical installations. Overhead power lines

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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7.7.12. Overhead lines of peat electrical installations are allowed to be built on peat deposits and in developed quarries.

7.7.13. For overhead line supports with a service life of up to 5 years, the use of unimpregnated coniferous wood is allowed. The diameter of the VL supports in the upper cut must be at least 14 cm.

7.7.14. The choice of wire cross-sections for overhead lines up to 10 kV should be made according to the allowable continuous current and allowable voltage loss.

The calculated value of the voltage loss in the line, taking into account the supply cable in normal operation for the most remote power receiver, is allowed up to 10% of the rated voltage of the substation transformers. The highest allowable value of voltage loss in the line when starting short-circuited electric motors is not standardized and is determined by the possibility of starting and the reliability of the operation of electric motors.

7.7.15. Joint suspension on common supports of wires of overhead lines up to 1 kV and wires of overhead lines above 1 kV is allowed. At the same time, the vertical distance between the suspension points of overhead lines up to 1 kV and overhead lines above 1 kV should be at least 1,5 m. Double fastening should be used throughout the joint suspension for overhead lines above 1 kV.

7.7.16. The distance from the wires of overhead lines up to 10 kV to the ground with the largest sag on the territory of the peat enterprise, with the exception of roads and populated areas, must be at least 5 m.

7.7.17. To ensure the safe passage of vehicles under the wires of the overhead line without removing the voltage, special spans with an increased height of the wires must be built. In this case, the distance between the lowest point of the wire and the highest part of the highest machine must be at least 2 m for overhead lines up to 10 kV, 2,5 m for overhead lines 20-35 kV.

7.7.18. When passing overhead lines up to 10 kV parallel to the narrow gauge railway track, the distance from the base of the support to the clearance of the buildings must be at least the height of the support plus 1 m.

On sections of a cramped route, the distance from the base of the overhead line support up to 380 V, designed to illuminate access roads, to the rail head must be at least 5 m.

7.7.19. When passing an overhead line up to 10 kV parallel to a narrow gauge portable railway track, the distance from the base of the overhead line support to the rail head must be at least 5 m.

7.7.20. When passing overhead lines up to 10 kV parallel to the axis of caravans or field piles of peat, the distance from the base of the support to the base of the caravan or pile, with their full dimensions, must be at least 4 m.

7.7.21. When passing overhead lines up to 10 kV near a metal overhead pipeline, the distance from the overhead line supports to the pipeline must be at least 8 m. It is allowed to reduce this distance to 3 m, provided that casings or visors are installed on the flanges of the pipeline.

7.7.22. When passing overhead lines up to 10 kV parallel to a wooden pipeline, the distance from the overhead line supports to the pipeline must be at least 15 m.

When crossing overhead lines with a wooden pipeline, solid steel casings must be installed above the pipeline. In this case, the distance from the part of the pipeline not covered by the casing to the projection of the wires of the overhead line must be at least 15 m.

7.7.23. On branches with a length of more than 1 km of overhead lines above 1 kV, as well as in front of stationary installations (low-pressure pumping stations, etc.), disconnectors must be installed.

7.7.24. The distance from the input wires of the overhead line supplying the mobile electrical installation up to 10 kV to the ground must be at least 3 m. The passage under the input wires must be fenced.

See other articles Section Rules for the installation of electrical installations (PUE).

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