Overhead power lines with voltage up to 1 kV. Grounding. Surge protection

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. Grounding. Surge protection

Free technical library

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

Comments on the article

2.4.38. Grounding devices designed for re-grounding, protection against lightning surges, grounding of electrical equipment installed on overhead line supports must be made on the overhead line supports. The resistance of the grounding device must be no more than 30 ohms.

2.4.39. Metal supports, metal structures and reinforcement of reinforced concrete support elements must be connected to the PEN conductor.

2.4.40. On reinforced concrete poles, the PEN conductor should be connected to the reinforcement of reinforced concrete pillars and struts of the poles.

2.4.41. Hooks and pins of wooden poles of overhead lines, as well as metal and reinforced concrete poles when suspended on them with an insulated carrier conductor or with all carrier conductors of the bundle, are not subject to grounding, with the exception of hooks and pins on the poles, where repeated grounding and grounding are performed to protect against atmospheric overvoltages.

2.4.42. Hooks, pins and fittings of overhead lines with a voltage of up to 1 kV, limiting the crossing span, as well as supports on which joint suspension is carried out, must be grounded.

2.4.43. On wooden poles of the overhead line, when passing to the cable line, the grounding conductor must be connected to the PEN conductor of the overhead line and to the metal sheath of the cable.

2.4.44. Protective devices installed on overhead lines for protection against lightning surges must be connected to the grounding conductor with a separate descent.

2.4.45. The connection of the grounding conductors to each other, their connection to the upper grounding outlets of the racks of reinforced concrete supports, to hooks and brackets, as well as to grounded metal structures and to grounded electrical equipment installed on overhead line supports, must be carried out by welding or bolted connections.

The connection of grounding conductors (descents) to the grounding conductor in the ground must also be carried out by welding or have bolted connections.

2.4.46. In a populated area with one- and two-story buildings, overhead lines must have grounding devices designed to protect against atmospheric surges. The resistance of these grounding devices should be no more than 30 ohms, and the distances between them should be no more than 200 m for areas with up to 40 thunderstorm hours per year, 100 m for areas with more than 40 thunderstorm hours per year.

In addition, grounding devices must be made:

1) on supports with branches to the entrances to buildings in which a large number of people can be concentrated (schools, nurseries, hospitals) or which are of great material value (livestock and poultry premises, warehouses);

2) on the end supports of lines having branches to the inputs, while the greatest distance from the adjacent grounding of these same lines should be no more than 100 m for areas with a number of thunderstorm hours per year up to 40 and 50 m - for areas with a number of thunderstorm hours per year over 40.

2.4.47. At the beginning and end of each VLI line, it is recommended to install clamps on the wires for connecting voltage control devices and portable grounding.

Grounding lightning surge protection devices are recommended to be combined with the re-grounding of the PEN conductor.

2.4.48. Requirements for grounding devices for re-grounding and protective conductors are given in 1.7.102, 1.7.103, 1.7.126. As grounding conductors on overhead line supports, it is allowed to use round steel with an anti-corrosion coating with a diameter of at least 6 mm.

2.4.49. Guys of overhead lines must be connected to the ground conductor.

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:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

New 14-pin Flash microcontrollers 17.02.2003

MICROCHIP TECHNOLOGY announced the start of production of new 14-pin Flash microcontrollers, which include an ADC, a comparator, a precision internal oscillator and a quick start function.

The memory of the PIC16F630 and PIC16F676 microcontrollers is based on the PMOS Electrically Erasable Cell (PEEC) technology, which currently provides the highest number of guaranteed erase-write cycles and high access speed.

Other interesting news:

▪ Medicines for old age

▪ Popcorn packaging for fragile items

▪ Nanosheets instead of platinum

▪ Concentration of thoughts hinders creativity

▪ Alarm signal - in every house

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Car. Article selection

▪ article Stone processing. History of invention and production

▪ article Which Asian state became independent against its will? Detailed answer

▪ article Logical elements and their electrical analogues. Radio - for beginners

▪ article Generator for measuring bridge. Encyclopedia of radio electronics and electrical engineering

▪ Article Hand snake. Focus Secret

Leave your comment on this article:

All languages of this page

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