Overhead power lines with voltage up to 1 kV. supports

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Encyclopedia of radio electronics and electrical engineering / Electrician

Section 2. Sewerage of electricity

Overhead power lines with voltage up to 1 kV. supports

Free technical library

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

Comments on the article

2.4.50. Supports made of various materials can be used on overhead lines.

For overhead lines, the following types of supports should be used:

1) intermediate, installed on straight sections of the overhead line route. These supports in normal operating modes should not perceive the forces directed along the overhead line;

2) anchor, installed to limit the anchor span, as well as in places where the number, grades and cross sections of overhead lines change. These supports should perceive, in normal operating modes, the forces from the difference in the tension of the wires directed along the overhead line;

3) angular, installed in places where the direction of the overhead line changes direction. These supports, under normal operating conditions, must perceive the resulting load from the tension of the wires of adjacent spans. Corner supports can be intermediate and anchor type;

4) terminal, installed at the beginning and end of the overhead line, as well as in places limiting cable inserts. They are anchor-type supports and must perceive, in normal operating modes of overhead lines, the one-sided tension of all wires.

Supports on which branches from overhead lines are carried out are called branch; supports on which the intersection of overhead lines of different directions or the intersection of overhead lines with engineering structures is carried out - cross. These supports can be of all the above types.

2.4.51. Support structures should provide the ability to install:

street lighting fixtures of all types;
end cable couplings;
protective devices;
sectioning and switching devices;
cabinets and shields for connecting electrical receivers.

2.4.52. Supports, regardless of their type, can be free-standing, with braces or braces.

Support guys can be attached to anchors installed in the ground, or to stone, brick, reinforced concrete and metal elements of buildings and structures. The cross section of the guys is determined by calculation. They can be stranded or round steel. The cross section of single-wire steel braces must be at least 25 mm2.

2.4.53. The overhead line supports must be calculated according to the first and second limit state in the normal operation of the overhead line for climatic conditions according to 2.4.11 and 2.4.12.

Intermediate supports must be designed for the following combinations of loads:

simultaneous action of transverse wind load on wires, free or covered with ice, and on the structure of the support, as well as the load from the tension of branch wires to inputs, free from ice or partially covered with ice (according to 2.4.12);
on the load from the tension of the wires of the branches to the inputs covered with ice, while it is allowed to take into account the deviation of the support under the action of the load;
on a conditional design load equal to 1,5 kN, applied to the top of the support and directed along the axis of the overhead line.

Corner supports (intermediate and anchor) must be designed for the resulting load from the tension of the wires and the wind load on the wires and the structure of the support.

Anchor supports must be designed for the difference in tension of the wires of adjacent spans and the transverse load from wind pressure with and without ice on the wires and the support structure. For the smallest value of the tension difference, 50% of the largest value of the unilateral tension of all wires should be taken.

End supports must be designed for one-sided tension of all wires.

Branch supports are calculated for the resulting load from the tension of all wires.

2.4.54. When installing supports on flooded sections of the route, where soil erosion or the impact of ice drift is possible, the supports must be strengthened (earth filling, paving, banquettes, installation of ice cutters).

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

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

The world's tallest astronomical observatory opened 04.05.2024

Exploring space and its mysteries is a task that attracts the attention of astronomers from all over the world. In the fresh air of the high mountains, far from city light pollution, the stars and planets reveal their secrets with greater clarity. A new page is opening in the history of astronomy with the opening of the world's highest astronomical observatory - the Atacama Observatory of the University of Tokyo. The Atacama Observatory, located at an altitude of 5640 meters above sea level, opens up new opportunities for astronomers in the study of space. This site has become the highest location for a ground-based telescope, providing researchers with a unique tool for studying infrared waves in the Universe. Although the high altitude location provides clearer skies and less interference from the atmosphere, building an observatory on a high mountain poses enormous difficulties and challenges. However, despite the difficulties, the new observatory opens up broad research prospects for astronomers. ... >>

Controlling objects using air currents 04.05.2024

The development of robotics continues to open up new prospects for us in the field of automation and control of various objects. Recently, Finnish scientists presented an innovative approach to controlling humanoid robots using air currents. This method promises to revolutionize the way objects are manipulated and open new horizons in the field of robotics. The idea of controlling objects using air currents is not new, but until recently, implementing such concepts remained a challenge. Finnish researchers have developed an innovative method that allows robots to manipulate objects using special air jets as "air fingers". The air flow control algorithm, developed by a team of specialists, is based on a thorough study of the movement of objects in the air flow. The air jet control system, carried out using special motors, allows you to direct objects without resorting to physical ... >>

Purebred dogs get sick no more often than purebred dogs 03.05.2024

Caring for the health of our pets is an important aspect of the life of every dog owner. However, there is a common assumption that purebred dogs are more susceptible to diseases compared to mixed dogs. New research led by researchers at the Texas School of Veterinary Medicine and Biomedical Sciences brings new perspective to this question. A study conducted by the Dog Aging Project (DAP) of more than 27 companion dogs found that purebred and mixed dogs were generally equally likely to experience various diseases. Although some breeds may be more susceptible to certain diseases, the overall diagnosis rate is virtually the same between both groups. The Dog Aging Project's chief veterinarian, Dr. Keith Creevy, notes that there are several well-known diseases that are more common in certain breeds of dogs, which supports the notion that purebred dogs are more susceptible to disease. ... >>

Random news from the Archive

The influence of parks and squares on the temperature in the city 28.02.2024

A study of the influence of green areas in cities on air temperature showed that botanical gardens are the most effective in cooling. According to an analysis carried out by scientists at the University of Surrey, these gardens can reduce temperatures in surrounding areas by five degrees Celsius, while parks can reduce temperatures by 3,2 degrees. Such studies have not been conducted before, and the results of this analysis provide new perspectives for urban planning.

Green spaces such as trees play a key role in reducing temperatures by providing shade, blocking the sun's rays and increasing humidity. However, according to the study, different forms of green space have different effectiveness in cooling the environment. Botanical gardens, as well as trees planted along streets and even green roofs and balconies, play a significant role in reducing temperatures to 3,8 degrees Celsius.

Parks that cover a larger area have a more global impact, influencing winds and helping to move cool air to warmer areas of the city.

This study highlights the importance of greening urban environments and will help consider the effectiveness of green spaces when planning urban spaces. Landscaping not only creates a pleasant atmosphere, but also contributes to a more comfortable and healthy life for city residents.

Other interesting news:

▪ Acoustic control in the nanoworld

▪ Mystery of human brain evolution solved

▪ Blueberry crop improvement robot

▪ Azulle Access3 keychain computer with Intel processor

▪ Crumpled graphene for artificial muscles

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Your stories. Article selection

▪ article Calendar. History of invention and production

▪ article Can a mockingbird scream with its own voice? Detailed answer

▪ article Ferula gum. Legends, cultivation, methods of application

▪ article LED night light. Encyclopedia of radio electronics and electrical engineering

▪ article Scheme, pinout (pinout) cable Nokia 8210/8850 (Mbus). Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews