JPS5914311A - Fallen snow deposit preventive type aerial transmission line - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to prevent the accumulation of material on twisted conductors during snowfall.
It concerns l.

Conventionally, a type of power transmission line with a magnetic metal material attached to the outside of the m-line conductor was used as a power transmission line to prevent accidents such as disconnections, short circuits, and tower collapses caused by snow accumulation during snowfall. is known. According to this type of power transmission line, the magnetic flux generated around the twister conductor by the upstream side of power transmission escapes from the magnetic metal material t, causing it to generate Joule heat due to eddy current loss, etc. It is said that the surface temperature will rise and that monitoring of the wires will be prevented.

However, in this case, the prior art mentioned above simply recognized that it was sufficient to simply attach the magnetic metal material to the outside of the electric wire, and in order to make it generate heat effectively and reliably. The installation is related to the conditions and the heat generation of the magnetic metal material.
In reality, even with the state of the technology described above, it is not always possible to effectively prevent the formation of ice and snow, since no deep consideration has been given to the molecular structural characteristics of the ice. In other words, in general, magnetic metal materials have directional properties due to their processing history. For example, in the case of wire-drawn or rolled products, what is the drawing? ! In the axial direction of the extended plastic deformation, the degree of alignment of the magnetic domains increases and the magnetic permeability increases steadily, whereas the characteristics described below gradually decrease as the distance from the axial direction increases. Therefore, it is possible to make effective use of these 7R properties of magnetic metal materials. The addition of a special knife on top of the twisted paper promotes extremely efficient and reliable heat generation.

The object of the present invention is to provide a novel overhead power transmission line that prevents snow accumulation, and which addresses the points mentioned in 11+J.

Next, an embodiment of the present invention will be described in detail with reference to FIG.

FIG. 117 shows a first embodiment of the present invention, which is obtained by cutting a magnetic metal rolled plate l as shown in FIG. 3 obliquely at an angle θ1 in a direction intersecting the rolling direction.
A magnetic metal open spiral body 8A, which is formed by forming a strip material 2A into a spiral shape having a pitch P smaller than the twisting pinch P of the outermost stranded wire 4, is placed on the bare silent conductor 6. The outermost layer strands 4 are wound in the direction of the +a bundle F generated in the circumferential direction of each strand 5 forming the outermost layer T so that the rolling direction is substantially coincident with the center T.

Fig. 2 shows a second embodiment of the present invention, in which a rolled magnetic metal plate material l as shown in Fig. 3 is cut at right angles at an angle θ2 in a direction intersecting the rolling direction. The obtained strip material 2B is twisted at the same pitch P as the twisting pitch P of the outermost layer twisting machine 4!
A magnetic metal open helix 8B formed into a helical shape so as to have the following properties is placed on the upturned twisting guide book 6 so that the direction of the magnetic flux F substantially coincides with the rolling direction as in the case of the first actual proportion. As shown, winding is done by attaching it.

In each of the embodiments described above, the twister conductor (S
Strong magnetic flux F is generated in the circumferential direction of each strand forming the outermost layer twister 4, especially in the circumferential direction of each strand 5 forming the outermost layer twister 4.
At this time, a magnetic metal open spiral [SA] is wound on the bare stranded wire conductor 1.

8B is one in which the rolling direction, that is, the direction showing extremely high magnetic permeability, coincides with the direction of the magnetic flux P, so the magnetic flux density is significantly increased and Joule heat generation is promoted efficiently.・When implementing this invention,
The magnetic metal open helix 8 (8A, 8B) has a temperature of tA & xi at a temperature below the permissible bending heat generation temperature of the power transmission line, in order to prevent a decrease in power transmission efficiency and a softening phenomenon of the bare twisted wire conductor Kfl due to heat generation. It is preferable to use a magnetic alloy that has a magnetic property. In addition, as the magnetic metal open spiral body 8, a material with good conductivity such as copper or aluminum is applied to the entrance surface of the gauge plate material 2.
If you use UJ by defacing or pasting it, n
11. Since a secondary current is generated in the RiJ conductive material so as to cancel out the magnetic flux F, the temperature rise due to the secondary current is added, and therefore the generated heat can be greatly increased. It is.

According to this invention, the rolled π strip material 2 is shaped like FliJ.
The magnetic metal open helix 8 that has been rolled is rolled in a bare state with the T-rolling direction substantially aligned with the direction of the magnetic flux F generated along the outer layer conductive strand 5 while still exhibiting magnetic permeability. Since it is wound on the wire conductor 6, the magnetic metal open spiral body 8 can generate Joule heat extremely efficiently, and the layered layer on the twisted conductor 6 can be effectively melted and removed. In particular, the magnetic metal open helix 8 is formed from a rolled strip material 2 that exhibits high magnetic permeability and is cut in the T-rolling direction or in the T6#A direction that intersects with its own length direction. Therefore, under the condition that the direction of the magnetic flux F matches the rolling direction, the helical pitch can be made relatively large, and this can be obtained as a pre-7 ohm molded product with self-binding force. Therefore, it is possible to easily and firmly wind the magnetic metal open spiral body 8 on the twisting machine conductor 6 without using a special leg member or having a gripping mechanism. It is possible to attach it to the T.

[Brief explanation of drawings]

Figures 1 and 2 show the anti-fouling type overhead transport a of the present invention.
FIG. 3 is a schematic side view showing a first example and a second example of the wire. FIG. 3 is an explanatory diagram T6 illustrating a method of forming an open spiral body made of magnetic metal used for constructing the structure T of this invention. l...Magnetic metal rolled plate material, 2 (2A, 2B
)... Band plate material, 8 (8A, 8B)...
・Magnetic metal open helix, 4... Outermost layer 1" wire, 5... Element wire, 6... Bare twisted conductor.

Claims (1)

[Claims] An open helix made of magnetic gold #l (8) formed from a strip material (2) obtained by cutting a magnetic metal rolled plate material (1) in a direction T crossing the rolling direction, or an outermost layer stranded wire (4 ) to form T
Each electric wire (5) is bare twisted so that the rolling direction substantially coincides with the direction of the magnetic flux (F) generated in the circumferential direction. An overhead power transmission line that prevents snow accumulation.