JPS6364010B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overhead power transmission line that prevents the generation of corona noise caused by adhesion of raindrops.

As is well known, when rainwater adheres to the surface of an overhead power transmission line in the form of droplets, the electric field strength on the line surface becomes uneven and the potential gradient increases locally, causing corona discharge. Audible noise will result. A variety of research has been carried out to suppress this audible noise, and among these, a track surface that has been specially treated to prevent rainwater from adhering to particles is expected to have a significant noise suppression effect. However, in the past, countermeasures have only been taken for transmission line conductors, so demand has been increasing in recent years.
For UHV lines, etc., it was not possible to fundamentally solve the problem.

In other words, in view of the rapid increase in power demand, UHV lines have significantly increased current capacity and transmission voltage per transmission line, and as a result, UHV lines are large-sized lines with a larger number of divided elementary conductor groups than in the past. Despite the fact that many large accessories are used in line construction, water drop prevention measures are only applied to the main conductors of power transmission lines, such as spacers and dampers. Due to the adhesion of water droplets to the surface of the high-voltage charging part, the potential gradient becomes significantly high in that part, which causes audible noise associated with corona discharge.

The object of the present invention is to provide an audible noise-suppressing overhead power transmission line line that eliminates the above-mentioned drawbacks.

Next, the present invention will be explained in detail using illustrated examples.

1 and 2 show an embodiment of the present invention, in which the ends of a large number of divided element conductors 2A constituting a multi-conductor power transmission line are connected to a retaining clamp 3A, a connecting fitting 3B, a yoke 3C, The tension steel tower 1 is tensile supported by the tension steel tower 1A via the tension insulator chain 7A.
The left and right power transmission lines centered on A are the detention clamps 3A.
They are electrically connected to each other by the jumper conductor 2B that connects them, and the intermediate part in the longitudinal direction of the divided element conductor 2A is connected to the suspension clamp 3D and the suspension insulator chain 7.
It is suspended and supported on the suspension tower 1B via B, and each divided element conductor 2A is connected by a spacer 3E so as to maintain a predetermined distance from each other in the span between both towers 1A and 1B, and further Damper 3G is connected to any divided elementary conductor 2A via armor rod 3F.
are attached to form an overhead power transmission line line, and the high voltage electric conductors 2 such as the divided element conductors 2A, jumper conductors 2B, etc. and the retaining clamps 3
A, connecting fitting 3B, yoke 3C, suspension clamp 3
D, spacer 3E, armor rod 3F, damper 3G, and jumper conductor parts 3
The surfaces of all the high-voltage conductor members 3 that are at the same potential as the high-voltage electric conductor 2 such as H are formed into finely uneven and rough surfaces 4 as shown in FIG. A hydrophilic coating 5 is formed on the hydrophilic coating 5, and a water-soluble coating 6 is further provided on the hydrophilic coating 5.

In the overhead power transmission line having the above configuration, the high voltage electric conductor 2 and the high voltage conductor member 3 have an uneven rough surface 4.
Since the hydrophilic film 5 formed on the top is covered and protected by the water-soluble film 6, oil and contaminants are prevented from being released during the installation of power transmission lines and the installation of accessories thereto. It is possible to reliably prevent the coating 5 from adhering to the surface of the hydrophilic coating 5 and making the coating 5 hydrophobic, and the water-soluble coating 6 is dissolved in rainwater during rainfall and washed away, forming the hydrophilic coating 5. is exposed as the outermost surface of the high-voltage electrical conductor 2 and the high-voltage electrical conductor member 3. Then, in the subsequent state of the overhead wire, the surface tension of rainwater, which tends to shrink its surface area and bulge into a spherical shape, is reduced by the affinity with the water molecules of the hydrophilic film 5, and the surface tension of the rainwater, which tends to shrink in surface area and bulge into a spherical shape, is reduced by the affinity with the water molecules of the hydrophilic film 5, and the surface tension of the rainwater is reduced by the affinity with the water molecules of the hydrophilic film 5. The capillary phenomenon of the surface 4 actively promotes the flow and diffusion of rainwater to the surrounding area, thereby preventing rainwater from adhering to the surfaces of the high-voltage electrical conductor 2 and the high-voltage electrical conductor member 3 in the form of granular water droplets. It is effectively prevented and the surfaces are uniformly wetted.

When carrying out the present invention, the finely uneven and rough surfaces 4 on the surfaces of the high-voltage electric conductor 2 and the high-voltage conductor member 3 may be treated by blasting such as shot blasting or sandblasting, or by using steel wire, steel wool, etc. The surface roughness can be formed by a mechanical method such as polishing treatment or a chemical method such as immersion treatment using an aqueous solution of an etching agent such as hydrofluoric acid, sodium fluoride, ammonium fluoride, or hydrochloric acid. It is usually preferable to set it to around several microns. The hydrophilic film 5 on the uneven surface 4 can be formed by spraying boiling water, pressurized steam, steam added with ammonia or amines, etc. on the rough surface 4, or by spraying the material on which the rough surface 4 is formed. It can be obtained as a boehmite film, an anodic oxide film, a chromate film, etc. by immersing the rough surface 4 in an atmosphere of The water-soluble coating 6 is made hydrophilic by coating or dipping with an anionic or nonionic water-soluble surfactant that can dissolve adhering pollutants such as oil in water or form an 0/W type emulsion. It can be obtained by attaching it onto the hydrophilic coating 5, or by attaching a water-soluble resin such as polyvinyl alcohol or cellulose onto the hydrophilic coating 5 by dipping or spraying.

According to this invention, all high-voltage electrical conductors 2, including not only the transmission line conductors that are overhead wired between each steel tower, but also the jumper conductors in the tension tower section.
surface and a detent clamp at the same potential as this,
The surfaces of all high-voltage conductor members 3, such as connecting fittings, yokes, suspension clamps, spacers, armor rods, dampers, and various metal parts of jumper conductor parts, have finely uneven rough surfaces 4 and a rough surface 4 provided thereon. Since a water droplet adhesion prevention treatment consisting of a hydrophilic coating 5 is applied and a water-soluble coating 6 is provided on top of the hydrophilic coating 5, the high-voltage electrical conductor 2 and the high-voltage conductor may be damaged by oils etc. adhering during construction work. Even if the surface of the body member 3 becomes contaminated, the contaminants such as oil can be removed from the surfaces of the high-voltage electrical conductor 2 and the high-voltage electrical conductor member 3 together with the water-soluble coating 6 that dissolves in rainwater when it rains. Then, the hydrophilic film 5, which is maintained in a state where there is no risk of contamination with oils or the like, or which does not impair the intended water droplet adhesion prevention effect, is applied to the top of the high-voltage electrical conductor 2 and the high-voltage electrical conductor member 3. It can be exposed as an outer surface, and therefore prevents rainwater from adhering to not only power transmission line conductors but also jumper conductors and various high-voltage conductor members in the form of granular water droplets that can cause corona discharge. This effectively prevents audible noise from occurring on the entire overhead power transmission line.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an enlarged surface state of a high voltage electric conductor and a high voltage conductor member in which the invention is implemented. In the figure, 1 (1A, 1B) is a steel tower, 2 (2
A, 2B) are high voltage electrical conductors, 3 (3A, 3B...
3H) is a high-voltage conductor member, 4 is an uneven rough surface, 5 is a hydrophilic coating, and 6 is a water-soluble coating.

Claims (1)

[Claims] 1. In an overhead power transmission line extending between steel towers 1, the surfaces of the high-voltage electric conductor 2 and the high-voltage conductor member 3 at the same potential are made into a finely uneven rough surface 4, and the rough surface is An overhead power transmission line characterized in that a hydrophilic film 5 is formed on a surface 4, and a water-soluble film 6 is further provided on the hydrophilic film 5.