JPH11332074A - Snow melting method for overhead transmission lines - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a method for melting snow on an overhead power transmission line, which can efficiently and efficiently melt snow on an overhead power transmission line regardless of the snow quality. The method comprises applying a high frequency of 2350 to 2550 MHz to an overhead transmission line to melt ice and snow that has accumulated on the overhead transmission line. In order to carry out this method, it is preferable to supply a high-frequency current to the overhead transmission line with a high-frequency adding coil that is energized through a high-frequency transmission circuit by a power supply picked up from the overhead transmission line. Further, it is preferable to perform on / off control between the pickup power supply unit and the high-frequency transmission circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for melting snow on overhead power transmission lines. In addition, there are snow accretion and ice accretion on the electric wire, and they are snow melting and ice melting respectively. In the present invention, these are collectively referred to as “snow accretion” and “snow melting”.

[0002]

2. Description of the Related Art As a countermeasure against snow accretion of an overhead power transmission line, for example, an overhead ground wire, a method of suppressing snow accretion by devising a shape of an electric wire, and suppressing snow accretion by attaching an accessory for hard-to-snow accretion to the electric wire. A method has been proposed, in which a method is used in which a current greater than required by the demand side is applied to the electric wire to promote snow melting by the Joule heat generation of the electric wire, and a method of encouraging snow melting by attaching a snow melting accessory to the electric wire. And has been applied to actual railways.

[0003]

In the above-mentioned prior art, the method of suppressing snow accumulation by devising the shape of the electric wire and attaching accessories has a drawback that a required effect cannot be obtained depending on the snow quality.

[0004] In addition, the method of promoting snow melting by heat generation with an excessive current complicates the power operation system. Furthermore, it is difficult to efficiently obtain the required amount of heat by the snow melting promotion method using snow melting accessories.

Therefore, the problems to be solved by the present invention (objects)
An object of the present invention is to provide a method for melting snow on an overhead transmission line, which can efficiently and efficiently melt snow on an overhead transmission line in a short time regardless of the snow quality.

[0006]

According to the present invention, there is provided a method of melting snow on an overhead power transmission line.
The method consists of applying a high frequency of 50 MHz to melt ice and snow on the overhead transmission line.

As in this method, 2350 to 2550 MHz
When a high frequency of z is applied, 2350-25
A current of 50 MHz flows, and the electromagnetic waves generated by this current promote the melting of ice and snow attached to the overhead transmission line.

[0008] As described above, the high frequency is set to 2350.
The reason why the frequency is set to ２５2550 MHz is that this frequency promotes the rotation of water molecules and effectively raises the temperature of water.

Further, according to the application of the high frequency as described above, only the moisture adhering to the overhead transmission line is heated, and the electric wire (metal) itself is not heated. Therefore, there is no increase in transmission line loss due to a rise in the temperature of the electric line. .

As a method for facilitating the realization of the above-mentioned method, it is preferable to supply a high-frequency current to the overhead transmission line by using a high-frequency adding coil that is energized through a high-frequency transmission circuit by a power supply picked up from the overhead transmission line. According to such a method, since the size and shape of the electric wire itself are not limited, the present invention can be applied to an existing line as well as a new line.

Further, by controlling on / off between the pickup power supply unit and the high frequency transmission circuit, high frequency can be efficiently applied only at the time of snowfall or snowfall.

[0012]

FIG. 1 shows an embodiment of a method for melting snow of an overhead transmission line according to the present invention.
A pickup power supply; a transformer and a power supply circuit; 3, an on / off control unit; 4, a high-frequency transmission circuit;

In this embodiment, an overhead transmission line, that is, a power line 1
A voltage or current is picked up by attaching a transformer of the pickup power supply unit 2 to the power supply, and a necessary power supply is obtained by passing the voltage or current through a constant voltage or constant current circuit.

By operating the high frequency transmission circuit 4 using the power source obtained as described above, 2350 to 2350
A high frequency of 550 MHz is transmitted, and the high frequency is supplied to the overhead transmission line 1 by the high frequency addition coil 5 as a high frequency current, so that the water content of ice and snow adhering to the overhead transmission line is heated and supplied to the snow melting.

The above-described circuit operation may be performed only during snowfall or snowfall. For this purpose, an on / off control unit 3 may be provided and turned on only during snowfall or snowfall.

The above embodiment is shown as a preferred example, and modifications and applications are possible. For example, the high-frequency adding coil 5 may be a transformer.

[0017]

According to the present invention as described above, it is possible to provide a method for melting snow on an overhead transmission line, which can efficiently and efficiently melt snow on an overhead transmission line in a short time regardless of the snow quality. The intended task (purpose) can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of a snow melting method for an overhead transmission line according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 overhead transmission line 2 pickup power supply unit; transformer and power supply circuit 3 on / off control unit 4 high frequency transmission circuit 5 high frequency addition coil

Claims (3)

[Claims] 1. A method for melting an overhead transmission line by applying a high frequency of 2350 to 2550 MHz to the overhead transmission line to melt ice and snow deposited on the overhead transmission line. 2. The method for melting snow of an overhead transmission line according to claim 1, wherein a high-frequency current is applied to the overhead transmission line by a high-frequency adding coil that is energized through a high-frequency transmission circuit by a power supply picked up from the overhead transmission line. 3. The method for melting snow on an overhead transmission line according to claim 2, wherein on / off control is performed between the pickup power supply unit and the high-frequency transmission circuit.