What can be the distance between the high-voltage power transmission towers: norms
Electric energy important for everyone is transmitted through cables suspended on poles of various designs and electrical transmission lines. For safety, the distance between the power transmission towers is extremely important in open areas or in the city.
The nuances that affect the distance between the posts. In different areas, the distance between the power lines and the height of the wire will differ. The values are required to be calculated from the fact that the wire tension,
as well as the sag, create large horizontal loads between the supports.
The second important point is the strength of icing in a particular area, as well as the resistance to wind swing. The value is calculated for all regions individually according to climatic conditions. Moreover, what distance was chosen between the support posts will depend on the following factors:
Correction of the distance between poles for electrical transmission lines is usually carried out in settlements. On the basis of all the requirements of the support, in no case block the convenient entrance to the courtyard, block the road for pedestrians, stand near the front facades of buildings and the entrances to the house. On the side of the road, a fence is installed to prevent cars from colliding with the supports.
These are concrete pillars, bedside tables and high fence curbs. Each of the high voltage poles must be labeled.
At a height of 2.5 to 3 meters, the following data is applied:
- Sequential number.
- Mains voltage value.
- Year of constructional installation.
- The width of the security zone.
- Distance from ground to communication cables.
- The telephone number of the organization that operates such a network.
Metal structures are protected from corrosion, which are regularly coated with a protective primer or paint for ships.
The supports begin to number from the current source. The wired maximum deflection must be calculated taking into account icing, which is immediately divided into 6 categories, as well as wind force. Tensioners are mounted at the suspension points, which ensure the minimum angle of deviation of the horizontal position of the cable and the minimum sagging. A wire that is not insulated is used for lines outside of towns and cities. It will be installed at the highest possible height on the insulators using special bolted busbars.
The distance between the supports is determined depending on the current voltage in the wires they carry:
Cables are suspended in parallel on insulators at a height that also depends on the voltage.
If it is up to 1 kV, then the line is attached at a height of 7 meters. Sagging is allowed and the distance to the bottom point will also be determined depending on the voltage. In the villages and cities of SNT and IZHS, the lower point of sagging should be more than 6 m from the soil surface.
Settlements of all types (city, summer cottage settlements and villages) have the same status for transmission of power lines through them. The permissible distance between the power transmission line supports is determined up to 70 meters, but on condition that at maximum icing they will not sag lower than 6 meters in the place where the sidewalk and the road pass.
The wire must be insulated. Street lighting in the private sector is installed on poles, which are placed along the road at a distance of 30 to 50 meters between them. Electric energy is supplied to the house and garage through a self-supporting wire, which is insulated. The insertion point must be at least 4 meters from the soil surface.
If the cable is stretched through the section from the post, intermediate supports are installed, providing suspension at a height of 7 meters and sagging to a maximum of 6 meters.
Trees are planted at a distance of more than 5 meters from the wire. And under the line itself, plant gardens with plants with a height of 1/2 meter. Shrubs are planted at a distance of one meter from the cable projection line. High-voltage power lines of more than 300,000 V must not pass through all types of settlements. The distance from the nearest house (residential type) must correspond to 100 meters.
The distance to the precinct border without buildings is the minimum width of the sanitary zone in the other direction.
The basis for calculating the length of the transmission line span will serve as TP 25. 0038, which reflects the development of calculated distances for overhead line supports from 280 to 350 V. A typical project contains tables with the dimensions of the span between metal and reinforced concrete supports, depending on on the level of icing, wind load and the type of wires in isolation and cross-section. On the basis of the data embedded in it, it will be possible to create projects and know at what distance to install poles with self-supporting insulated wires.
If an electric wire, copper or metal, is stretched without insulation, then it will depend on how much the span between the pillars will change. The fence is installed at a distance of 5 meters from the power line. The electrical transmission line from the house and the support should be located no closer than 6 meters.
Transmission lines (high-voltage) make up an unusual and rather complex metal structure, whose shape will depend on the voltage in the wires and the number of lines. Poles are mounted under power lines up to 35,000 V.
They can be of different materials:
Wooden intermediate supports for electrical transmission are attached to reinforced concrete posts - the base. To protect against destruction, wood is impregnated with special compounds.
The dimensions of the deflection to the lowest point can be up to 4.5 meters when placed in the field, at a distance of at least 100 meters from roads and the private sector. For high-voltage lines up to 35,000 V, the wooden pole part has a height of 8.5 meters. The distance between them:
Garage, summer cottage and residential building can be located from power lines at a distance of 5.5 meters. If the distance from the point to the input post is more than 20 meters, additional posts are required.
Anchor concrete supports look like the letter A, which is skewed. The main stand is placed evenly, but the anchor (or rather the support) is inclined. The distance between power transmission lines made of reinforced concrete at ground level is more than 1 meter. The height to the bottom of the insulator is 7.8 meters, and there will be a distance of 1 meter between the suspensions (that is, the wires).
The maximum distance between power transmission line supports is 7.6 meters. Special devices provide tension to the wires, and anchor supports are usually used as corner and end supports. Steel supports are used for high-voltage lines with a voltage of more than 35,000 V.
They can be of the following types:
- Single column.
Single-pole transmission line supports have a tower structure with a sharp top. They are installed on a concrete base. The height is from 9 to 23 meters, and the distance between the suspension points is from 4.8 meters.
Insulators are located on remote types of brackets on both sides of the support. It can also be installed between distribution points and large consumers like cities and industrial plants. In the residential private sector, installation is very rare, and the power line can be between the streets, and the width of the sanitary zone is observed, as much as it should be from the voltage - 5-10 meters on each side of the extreme wires.
The distance between metal single-post supports is from 200 meters in the drawing of cities and up to 400 meters on flat terrain away from all roads and buildings. The gantry supports have a pair of struts connected at the top by a transverse type structure.
The insulators are suspended at the transverse protruding edges and between the posts. The distance between the portal supports can be up to 700 meters. They are mounted to transport electrical energy between an object that produces electrical energy and the main PUE, from which the wires will lead to the city limits.
By purpose and design, several types of supports are distinguished in power lines:
Intermediate type supports are usually in the form of a simple pillar. Reinforced anchor - arched type with a suspension height of up to 20 meters, and the ratio of the span to the type of supports looks like this:
- In the industrial zone, the distance between the supports will be 500 meters.
- In the private sector for transmission lines with voltages from 6,000 to 10,000 V, intermediate structures of a simple type are used, that is, poles.
They are mounted at a distance of 60 meters.
- For a reinforced anchoring structure, the distance between the 10,000 V power transmission lines will be increased to 250 meters.
And consider a separate topic.
Electric transmission lines emit floors of an electromagnetic type, which negatively affect human health, plants and animals. Sanitary zones are made under power lines starting from 330,000 V.
Their width will be 10 meters on all sides. Measurements are made from the projection onto the ground of the extreme wire. It is impossible to stretch high-voltage wires through the air at any heights above railways and gas pipelines. In the event that a break appears, there will be a great chance of an accident. A gas pipeline that runs along the ground should not in any case intersect with electric transmission lines through the air.
For the crossing, there must be an underground cable conduit with earthed installations at the point of exit and entry of the line. Electricity is required to be supplied to cities and towns through electric transmission lines.
Nearby there may be a parallel pipeline, streets with houses and a motorway. The norm for the distance from them power lines should be from 5 to 10 meters, and the standards are determined by the width of a dignity. zones.
The distance should be calculated taking into account the boundaries of the suburban sector. There must be at least 100 meters of distance to residential buildings if the voltage is more than 35,000 V. All requirements for the distances between power lines are described in GOST R 21. 1101-2009. On the basis of this regulatory document, all calculations are performed and projects for electrical transmission lines are developed.
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