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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Section 2. Sewerage of electricity Overhead power lines with voltage above 1 kV. Passage of overhead lines in populated areas
Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE) 2.5.210. The passage of overhead lines through populated areas should be carried out in accordance with the requirements of building codes and regulations. "Urban planning. Planning of buildings and development of urban and rural settlements" (VL 110 kV and above should be placed outside the residential area). The angle of intersection with the streets (drives) is not standardized. When passing overhead lines along the street, the location of wires above the carriageway is allowed. To prevent forced collisions of vehicles with overhead lines installed within urban and rural streets and roads, they should be protected in accordance with the requirements of building codes and regulations. 2.5.211. The fastening of the wires of the overhead line on the pin insulators must be double. When using suspension and polymer insulators, the fastening of wires on intermediate supports must be carried out with blind clamps. The fastening of VLZ wires on pin insulators must be reinforced using helical spring ties with a polymer coating; when using insulators supporting garlands, the wires should be fastened using deaf supporting clamps. 2.5.212. The smallest distances from the wires of the overhead line to the surface of the earth in a populated area in the normal mode of operation of the overhead line should be taken not less than those given in table. 2.5.22. The smallest distances are determined with the largest sag of the wire without taking into account its heating by electric current:
2.5.213. At the intersection of overhead lines with streets, driveways, etc., vertical distances from wires with a cross-sectional area of \u185b\u2bthe aluminum part of less than 2.5.22 mmXNUMX to the ground should also be checked for a wire break in an adjacent span at an average annual air temperature, without taking into account the heating of wires by electric current. These distances must not be less than those given in Table. XNUMX. When passing overhead lines within specially designated corridors in the city, as well as for overhead lines with wires with an aluminum section of 185 mm2 or more, checking the vertical distances in case of wire breaks is not required. Table 2.5.22. The smallest vertical distance from the wires of the overhead line to the surface of the earth, industrial buildings and structures in populated areas
2.5.214. The horizontal distance from the base of the overhead line support to the ditch or side stone of the carriageway of the street (passage) must be at least 2,0 m; the distance to sidewalks and footpaths is not standardized. 2.5.215. The passage of overhead lines over buildings and structures, as a rule, is not allowed. It is allowed to pass overhead lines over industrial buildings and structures of industrial enterprises of I and II degrees of fire resistance in accordance with building codes and rules for fire safety of buildings and structures with roofs made of non-combustible materials (for 330-750 kV overhead lines only over industrial buildings of electric stations and substations). At the same time, the vertical distance from the wires of the overhead line to the above buildings and structures with the largest sag must be at least those given in Table. 2.5.22. Metal roofs over which overhead lines pass must be grounded. Grounding resistance should be no more than that specified in Table. 2.5.19. For overhead lines of 330 kV and above, the protection of personnel located inside the industrial buildings of power stations and substations from the influence of an electric field must be ensured, and the metal roof must be grounded at least at two points. 2.5.216. Horizontal distances from the extreme wires of overhead lines up to 220 kV with their greatest deviation to the nearest parts of industrial, warehouse, administrative and public buildings and structures must be at least: 2 m - for overhead lines up to 20 kV, 4 m - for overhead lines 35- 110 kV, 5 m - for 150 kV overhead lines and 6 m - for 220 kV overhead lines. Horizontal distances from the extreme wires of 330 kV overhead lines and above must be at least:
The passage of overhead lines through the territories of stadiums, educational and children's institutions is not allowed. 2.5.217. Distances from deviated wires of overhead lines located along streets, in parks and gardens, to trees, as well as to suspension cables for road signs, must be at least those given in Table. 2.5.21. Horizontal distances from the outermost wires of newly constructed overhead lines with their undeflected position to the boundaries of land plots of residential and public buildings, to children's playgrounds, recreation and physical education areas, utility sites or to the nearest protruding parts of residential and public buildings in the absence of land plots from the side the passage of overhead lines, as well as to the boundaries of household plots of individual houses and collective garden plots, there must be at least distances for security zones of overhead lines of the corresponding voltages. It is allowed to take for overhead lines up to 20 kV the horizontal distance from the extreme wires of overhead lines with their greatest deviation to the boundaries of household land plots of individual houses and collective garden plots of at least 2 m. 2.5.218. If, at the distances specified in 2.5.216 and 2.5.217, from overhead lines to buildings and structures with receiving radio or television equipment, radio interference exceeds the values normalized by state standards, and compliance with the requirements of the standards cannot be achieved by special measures (remote antennas , changing the design of the overhead line, etc.) or these measures are impractical, the distances from the extreme wires of the overhead line, with their position not deviated, to the nearest parts of these buildings and structures should be taken at least: 10 m - for overhead lines up to 35 kV, 50 m - for overhead lines 110 -220 kV and 100 m - for overhead lines 330 kV and above. The calculation of the level of radio interference must be carried out taking into account Ch. 1.3 and 2.5.81. 2.5.219. The distances from the ground electrodes of the overhead lines to the power cables laid in the ground must be taken in accordance with Ch. 2.1 and 2.3.
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