Overhead power lines with voltage above 1 kV. Passage of overhead lines in uninhabited and hard-to-reach areas

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 2. Sewerage of electricity

Overhead power lines with voltage above 1 kV. Passage of overhead lines in uninhabited and hard-to-reach areas

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

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2.5.201. The distances from overhead line wires to the ground surface in uninhabited and hard-to-reach areas in normal overhead line mode should be taken no less than those given in table. 2.5.20.

The smallest distances are determined with the largest sag of the wire without taking into account its heating by electric current:

at the highest air temperature for overhead lines of 500 kV and below;
at air temperature according to 2.5.17 at maximum permissible values of the intensity of the electric and magnetic components of the electromagnetic field for a 750 kV overhead line;
at design linear ice load according to 2.5.57 and air temperature at ice according to 2.5.51.

Table 2.5.20. The shortest distance from overhead line wires to the surface of the earth in uninhabited and inaccessible areas

Terrain feature	The smallest distance, m, at voltage VL, kV
Terrain feature	to 20	35-110	150	220	330	500	750	VLZ
Uninhabited area; areas of tundra, steppes with soils unsuitable for agriculture, and deserts	6	6	6,5	7	7,5	8	12	5
Hard to reach terrain	5	5	5,5	6	6,5	7	10	5
Inaccessible mountain slopes, rocks, cliffs, etc.	3	3	3,5	4	4,5	5	7,5	3

2.5.202. When passing overhead lines of all voltage classes, it is recommended not to occupy land irrigated by sprinklers. It is allowed to pass overhead lines through these lands, provided that the requirements of building codes and regulations for reclamation systems and structures are met.

2.5.203. At the intersection of overhead lines with livestock runs, the shortest vertical distance from the wires to the ground surface should be no less than at the intersection with highways (see 2.5.258).

2.5.204. At the intersection of overhead lines with reclamation canals, the shortest vertical distance from the wires at the highest air temperature, without taking into account heating of the wire by electric current, to the lifting or retractable parts of earth-moving machines located on the dam or berm of canals, in working position or to the dimensions of dredgers at the highest level of high waters must be at least: 2 m - for overhead lines up to 20 kV; 4 m - for overhead lines 35-110 kV; 5 m - for overhead lines 150-220 kV; 6 m - for 330 kV overhead line; 9 m - for overhead lines 500-750 kV.

The supports must be located outside the land allocation zone for permanent use for reclamation canals.

When running parallel overhead lines with reclamation canals, the outermost wires of the overhead lines, if their position is not deviated, should be located outside the strip of land for permanent use for reclamation canals.

2.5.205. Trellis wire for hanging grapes, hops and other similar agricultural crops, crossed by overhead lines of 110 kV and above at an angle of less than 70º, must be grounded every 50-70 m of its length within the security zone of the overhead line.

Grounding resistance is not standardized.

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

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