Overhead power lines with voltage above 1 kV. Crossing and approaching overhead lines with highways

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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. Crossing and approaching overhead lines with highways

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

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2.5.256. The requirements given in 2.5.256 - 2.5.263 apply to intersections and approaches to highways:

public use and access roads to industrial enterprises (categories IA, IB, II-V according to building codes and regulations for highways);
on-farm in agricultural enterprises (categories IC - III-C according to building codes and regulations for on-farm roads on collective farms, state farms and other agricultural enterprises and organizations).

The intersection and approach of overhead lines with federal public roads must also comply with the requirements of the rules for the establishment and use of roadside strips of federal public highways.

The angle of intersection with highways is not standardized.

2.5.257. When crossing highways of categories IA and IB, overhead line supports limiting the span of the intersection must be of the anchor type of normal design.

On overhead lines with suspended insulators and an unsplit wire in phase with a cross-sectional area of the aluminum part of 120 mm2 or more, the tension garlands of insulators for the wire must be double-circuit with separate fastening of each circuit to the support.

Tension multi-circuit garlands of split-phase insulators, consisting of two to five circuits, should be provided with separate fastening of each circuit to the support.

In the span of the intersection of roads of categories IA and IB, limited by anchor supports, it is allowed to install intermediate supports outside the culvert at the base of the roadway, taking into account the requirements of 2.5.262. Fastening of wires on these supports should be carried out by supporting double-circuit garlands of insulators with blind clamps.

When crossing motor roads of categories II-V, IC - III-C, the supports limiting the span of the intersection can be of an anchor type of lightweight construction or intermediate.

On intermediate supports with supporting garlands of insulators, the wires should be suspended in blind clamps; on supports with pin insulators, double fastening of wires on the overhead line and reinforced fastening on the overhead line should be used.

When constructing new highways of all categories and passing them under existing 500-750 kV overhead lines, reconstruction of overhead lines is not required if the shortest distances are maintained in accordance with Table. 2.5.35.

2.5.258. Distances when crossing and approaching overhead lines with highways must be no less than those given in table. 2.5.35.

In all cases of approaching curved sections of roads passing along embankments, the minimum distances from the overhead line wires to the edge of the roadbed must be no less than the vertical distances indicated in Table. 2.5.35.

The shortest vertical distances in normal operation of overhead lines from the wires to the roadway should be taken:

without taking into account heating of the wire by electric current at the highest air temperature for overhead lines of 500 kV and below, at air temperatures according to 2.5.17 at the maximum permissible values of the intensity of the electric and magnetic components of the electromagnetic field for overhead lines of 750 kV;
at design linear ice load according to 2.5.55 and air temperature at ice according to 2.5.51.

Table 2.5.35. The shortest distances when crossing and approaching overhead lines with highways

Intersection, approach or parallel following	The smallest distances, m, at voltage VL, kV
Intersection, approach or parallel following	Until 20	35-110	150	220	330	500	750
Vertical distance:
a) from the wire to the pavement of the carriageway of roads of all categories	7	7	7,5	8	8,5	9,5	16
b) the same, in case of a wire break in an adjacent span	5,5	5,5	5,5	5,5	6	-	-
Horizontal distance:
1. When crossing roads of all categories, with the exception of III-C and V:
a) from the base or any part of the support to the edge of the roadbed	Support height
b) in cramped conditions from the base or any part of the support to the base of the embankment or to the outer edge of the ditch of roads of categories IA, IB and II	5	5	5	5	10	10	15
c) the same, to the road of categories III, IV, IC, II-C	2,0	2,5	2,5	2,5	5	5	15
2. When crossing a road of categories III-C and V:
a) from the base or any part of the support to the edge of the roadbed	Support height
b) in cramped conditions from the base or any part of the support to the bottom of the embankment, outer edge, excavation or side drainage ditch	1,5	2,5	2,5	2,5	5	5	15
3. When traveling in parallel with roads of all categories:
a) from the base or any part of the support to the edge of the roadbed	Support height plus 5 m
b) from the extreme undeflected wire to the edge of the subgrade	10	15	15	15	20^*	30^*	40^*
c) the same, in cramped conditions	2	4	5	6	8	10	15

* Taking into account the maximum permissible levels of electric field strength.

2.5.259. Vertical distances from overhead line wires with a cross-sectional area of the aluminum part of less than 185 mm2 at intersections with highways must be checked for wire breakage in the adjacent span at average annual air temperature without taking into account heating of the wires by electric current. These distances must be no less than those given in the table. 2.5.35.

2.5.260. At the intersection of overhead lines with highways on both sides of the overhead lines, road signs must be installed on the roads in accordance with the requirements of the state standard.

At the intersections of overhead lines of 330 kV and higher with highways on both sides of the overhead lines, road signs must be installed on the roads prohibiting traffic from stopping in the security zones of these lines.

Hanging road signs on guy ropes within the security zones of overhead lines is not allowed.

2.5.261. When approaching or crossing green spaces located along highways, you should be guided by 2.5.207.

2.5.262. To prevent vehicle collisions with overhead line supports located at a distance of less than 4 m from the edge of the roadway, road barriers of group I* must be used.

* The definition of road barriers of group I is given in the building codes and regulations for highways.

2.5.263. The minimum distances from overhead lines to highway bridges with a span of 20 m or less should be taken as the same as to the corresponding highways according to Table. 2.5.35, and with a span of more than 20 m - are installed when designing overhead lines.

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

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