CN213339706U - Electromagnetic shielding steel core aluminum stranded wire for high-voltage overhead line - Google Patents

Abstract

The utility model discloses an electromagnetic shielding steel core aluminum stranded wire for a high-voltage overhead line, which comprises a plurality of steel wires and a stranded wire body made of a plurality of aluminum wires wound around the plurality of steel wires in a twisting way; the peripheral surface of each steel wire and each aluminum wire is deposited with an iron-based amorphous alloy layer for electromagnetic shielding through an electrolytic deposition process. The utility model discloses the advantage has reduced high-pressure overhead line electromagnetic radiation intensity 50% ~ 70% on prior art basis, has reduced resident and social personnel electromagnetic radiation influence along the line to high-pressure overhead line corridor, purifies public space electromagnetic environment.

Description

Electromagnetic shielding steel core aluminum stranded wire for high-voltage overhead line

Technical Field

The utility model relates to an electric power system high pressure air wire especially relates to an electromagnetic shield type steel core aluminum stranded conductor for high-pressure overhead line.

Background

Electromagnetic radiation refers to the propagation of a portion of the electromagnetic energy emitted by a field source away from the field source and out-diffusing the energy in the form of electromagnetic waves. Electromagnetic waves are waves in which electric and magnetic fields move and transfer energy, including radio waves, microwaves, infrared rays, visible light, ultraviolet rays, x-rays, gamma rays, and the like. In urban (town) areas, substations are built, and electric fields, magnetic fields and electromagnetic radiation exist inside and around the substations; the main reason for generating electric field, magnetic field and electromagnetic radiation is that the live equipment and live conductor of the substation have power frequency voltage and power frequency current. In order to prevent the electric field, the magnetic field and the electromagnetic radiation generated by the charged equipment from affecting the human body, the electric field, the magnetic field and the electromagnetic radiation energy need to be controlled within a certain range. The concern of electric and magnetic fields affecting human health was first originated in the united states of the last century, western europe, etc., where electric power facilities were first used on a large scale. In the research work on electromagnetic fields and human health by the international committee for non-ionizing radiation protection, according to the relevant research results, the international committee for non-ionizing radiation protection issued a guideline in 1998 to specify that the safety value of the power frequency electric field intensity to the public is 4kV/m and the limit value of the power frequency magnetic induction intensity to the public is 100 microtesla. This standard was officially recommended by the world health organization in 2007 and adopted by most countries. The power frequency electromagnetic radiation protection safety value regulation of part of the countries (organizations) in the world is shown in figure 3.

In the 'electromagnetic radiation environmental protection management method' (published by eighteenth office of the national environmental protection agency on 3/25 1997) of China, the twenty-th unit and individual engaged in electromagnetic radiation activities must regularly check the performance of electromagnetic radiation equipment and its environmental protection facilities, discover hidden dangers in time and take remedial measures in time. Sensitive buildings such as residential houses, kindergartens and the like cannot be built in planning restricted areas defined according to the requirements of environmental protection and urban planning around the centralized use of large electromagnetic radiation emitting facilities or high-frequency equipment. The electromagnetic radiation environmental protection management method is characterized in that the three contents of a power frequency strong radiation system specified by an electromagnetic radiation construction project and an equipment name book in the annex comprise: a power transmission and transformation system with the voltage of more than 100 kV; power frequency equipment with current above 100A; light rail and main line electrified railways.

The experts such as the teaching just at the high points of the main committee of the Chinese electromagnetic compatibility committee, the teaching of Zhaoyefeng of the Chinese electro-technical society, the teaching of pottery and Yongyu of the original institute of labor protection in Beijing city, and the like indicate that: there is a lot of scientific evidence at home and abroad that the electromagnetic radiation environment with the magnetic field higher than 0.2 microtesla is likely to cause harm to human body. Professor soviet Thomsom the Chinese disease prevention center environment suggests that the harm of electromagnetic radiation to human health is accumulated, and the harm cannot be said to be caused even if the electromagnetic radiation does not exceed the standard.

In domestic electric power systems in China, a high-voltage overhead line occupies a significant hertz position, has the longest length of thousands of kilometers, is widely distributed in the territorial area, has large transmission energy, high voltage level and high current intensity, and generates a power frequency electric field, a power frequency magnetic field and a higher harmonic electromagnetic field. Especially, the power frequency electric field, the power frequency magnetic field and the higher harmonic electromagnetic field generated by the ultra-high voltage transmission line are stronger under the condition of the same current density. Therefore, the research on how to reduce the generation of the power frequency electric field and the power frequency magnetic field and prevent the transmission to the outside by taking the high-voltage transmission line as a key object and create a safe electromagnetic environment for social public spaces and transformer substation operators is still an important subject of the research in the field.

Disclosure of Invention

An object of the utility model is to provide an electromagnetic shield type steel core aluminum stranded conductor for high-pressure overhead line has effectively reduced high-pressure overhead line's electromagnetic radiation and electromagnetic interference's influence.

In order to achieve the above purpose, the utility model can adopt the following technical proposal:

the electromagnetic shielding type steel core aluminum stranded wire for the high-voltage overhead line comprises a plurality of steel conducting wires and a stranded wire body made of a plurality of aluminum conducting wires wound around the plurality of steel conducting wires in a stranding mode; an iron-based amorphous alloy layer for electromagnetic shielding is deposited on the outer peripheral surface of each of the steel wire and the aluminum wire by an electrolytic deposition process.

The utility model discloses an advantage embodies in following aspect:

1. after the technical result of the invention is adopted, the electromagnetic radiation intensity of the high-voltage overhead line is reduced by 50-70% on the basis of the prior art, and the electromagnetic radiation influence on residents and social personnel along the corridor of the high-voltage overhead line is reduced.

2. When the high-voltage overhead line normally operates, electromagnetic interference caused by electromagnetic radiation of the high-voltage overhead line is effectively prevented, and the electromagnetic environment of a public space is purified. Generally, the voltage and the current of a high-voltage overhead line in an electric power system are both power frequency (50 Hz), no matter how perfect the harmonic treatment in the electric power system is, higher harmonics always exist, electromagnetic radiation of the higher harmonics corresponding to different frequencies is radiated to the space, and interference signals are formed to influence the transmission of normal public wireless signals.

3. When the high-voltage overhead line crosses important railways and highways and passes through a low-altitude airline channel, the influence of electromagnetic radiation and electromagnetic interference is effectively reduced, and a cleaner and better electromagnetic space is provided for important fields (military command, confidential communication, emergency matters and the like) related to national safety.

4. When a power system where the high-voltage overhead line is located breaks down, performs switching operation, performs reclosing through relay protection action, and maintains and overhauls the high-voltage overhead line, and relates to the situation that the high-voltage overhead line is out of operation and is in live-line operation again, the electromagnetic radiation intensity at the moment is high, and the influence on external electromagnetic interference is also large.

5. Has positive effect on social stability. The electromagnetic radiation of the high-voltage overhead line is reduced, the improvement of scientific and technological progress on the living environment of people is reflected, and the harmonious development of the society is promoted.

Drawings

Fig. 1 is a schematic sectional view of the aluminum conductor steel reinforced of the present invention.

Fig. 2 is an enlarged view of a portion I of fig. 1.

FIG. 3 is a diagram of the safety value of the power frequency electromagnetic radiation protection of some countries (organizations)

Detailed Description

The following describes embodiments of the present invention in detail with reference to the drawings, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are provided, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 1 and 2, the electromagnetic shielding type steel core aluminum stranded wire for the high-voltage overhead line of the present invention comprises a plurality of steel wires 1 and a stranded wire body made of a plurality of aluminum wires 2 wound around the plurality of steel wires 1 in a twisting manner; in order to reduce the influence of magnetic radiation on residents and social personnel along the line, an iron-based amorphous alloy layer 3 for electromagnetic shielding is deposited on the peripheral surface of each steel lead 1 and each aluminum lead 2 through an electrolytic deposition process, and in order to ensure the shielding effect of the iron-based amorphous alloy layer, the components of the iron-based amorphous alloy layer 3 can be Fe: 68.77%, Co: 18.23%, Si: 0.99%, B: 12.01 percent.

Specifically, the deposition thickness of the iron-based amorphous alloy layer 3 on the surface of each steel wire or aluminum wire can be determined according to the following table 1:

TABLE 1 thickness of Fe-based amorphous alloy layer of steel/aluminum wire under standard environmental conditions

Wherein, the front numerical value represents the thickness of the iron-based amorphous alloy layer of the aluminum wire, and the rear numerical value represents the thickness of the iron-based amorphous alloy layer of the steel wire; the standard environmental conditions are: the working temperature of the steel-cored aluminum strand is +70 ℃, the current-carrying capacity is the rated alternating current-carrying capacity, the temperature of the outside air is +25 ℃, the relative humidity of the air is 50%, and the altitude is less than or equal to 1000 m.

The iron-based amorphous alloy can be deposited on the surface of each steel lead and each aluminum lead which are contacted with the outside to form an iron-based amorphous alloy layer by adopting an electrolytic deposition method; because the atoms of the iron-based amorphous alloy layer are in a randomly arranged amorphous structure, a B-H loop is narrow (B is magnetic induction intensity, and H is magnetic field intensity), the magnetic permeability is high, the coercive force (coercive magnetic field) is low, the decay capability of an electromagnetic field is strong, and the magnetic shielding performance is better particularly in a power frequency section. Meanwhile, the irregular arrangement of the amorphous alloy atoms limits the free passage of electrons, so that the resistivity is high, the iron-based amorphous alloy layer hardly generates eddy current, and the electric energy loss is extremely low.

Claims (1)

1. An electromagnetic shielding steel core aluminum stranded wire for a high-voltage overhead line comprises a plurality of steel conducting wires and a stranded wire body made of the plurality of aluminum conducting wires wound around the plurality of steel conducting wires in a stranding mode; the method is characterized in that: an iron-based amorphous alloy layer for electromagnetic shielding is deposited on the outer peripheral surface of each of the steel wire and the aluminum wire by an electrolytic deposition process.

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