Overhead power lines with voltage above 1 kV. Passage of overhead lines through plantings

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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 through plantings*

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

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2.5.206. It should, as a rule, avoid laying overhead lines along forests of group I **.

2.5.207. For the passage of the overhead line through the plantations, clearings must be cut.

The width of clearings in plantations should be taken depending on the height *** of plantations, taking into account their prospective growth within 25 years from the date of commissioning of the overhead line and the group of forests.

1. In plantations with a promising rock height of up to 4 m, the width of the glades is taken equal to the distance between the extreme wires of the overhead line plus 3 m in each direction from the extreme wires. When passing overhead lines through the territory of orchards, clearing is not required.

2. When passing overhead lines in plantations of forests of group I, parks and orchards, the width of the clearing is calculated by the formula

A = D + 2(B + a + K)

where A is the width of the clearing, m;

D - horizontal distance between the outermost, most distant phase wires, m;

B - the smallest allowable horizontal distance between the outermost wire of the overhead line and the crown of trees, m (these distances must be at least those given in Table 2.5.21);

a - horizontal projection of the sag of the wire and the supporting garland of insulators, m, with their greatest deviation in accordance with 2.5.73 (clause 1), taking into account the type of terrain in accordance with 2.5.6;

K is the radius of the horizontal projection of the crown, taking into account the prospective growth over 25 years from the moment the overhead line was put into operation, m.

The radii of projections of tree crowns of the main forest-forming species are assumed to be equal, m:

pine, larch - 7,0
spruce, fir - 5,0
oak, beech - 9,0
linden - 4,5
birch - 4,5
aspen - 5,0

For other tree species, the crown projection radii are determined during a specific design according to the plantation owner's data.

3. In forests of groups II and III, the width of the clearing is taken equal to the larger of the two values calculated using the formula given in paragraph 2, and according to the formula

A \u2d D + XNUMXH

where H is the height of the plantations, taking into account the prospective growth, m.

4. For VLZ, the width of clearings in plantings should be taken not less than the distance between the outer wires plus 1,25 m in each direction, regardless of the height of the plantings. When passing the VLZ through the territory of orchards with trees more than 4 m high, the distance from the outermost wires to the trees must be at least 2 m.

5. Individual trees or groups of trees growing outside the clearing and threatening to fall onto wires or overhead lines should be cut down.

* Plantations refer to natural and artificial stands and shrubs, as well as gardens and parks.

** The division of forests into groups is given in the Forest Code of the Russian Federation.

*** Hereinafter, the stand height is understood as the average height increased by 10% of the dominant species in terms of reserves, located in the upper tier of the stand. In plantations of different ages, it is understood as the average height of the dominant generation increased by 10%.

Table 2.5.21. The smallest horizontal distance between the wires of the overhead line and the crowns of trees

VL voltage, kV	Until 20	35-110	150-220	330-500	750
The smallest distance, m	3	4	5	6	7

2.5.208. In relief depressions, on slopes and in ravines, a clearing is cut taking into account the prospective height of the plantations, while if the vertical distance from the top of the tree crowns to the overhead line wire is more than 9 m, the clearing is cut only under the overhead line in width equal to the distance between the outermost wires plus 2 m each side.

After the completion of the installation, the places of violation of the slopes in the clearings should be planted with shrubs.

2.5.209. Across the entire width of the clearing along the overhead line, it should be cleared of cut down trees and shrubs, uprooting or cutting them to the ground level and reclamation.

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

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