JPS6010492B2 - Power line snow accumulation prevention device - Google Patents

Description

[Detailed Description of the Invention] Accidents caused by snow on overhead power lines in snowy regions continue to occur year after year.

Various measures have been proposed to prevent this. Some of the already known ideas include making the wire itself non-circular in cross section, covering it with ring-shaped parts at predetermined intervals, winding the wire in a spiral, and creating continuous protrusions on the surface. There are ways to set it up. Some of these conventional techniques are not very effective, while others are effective to some extent, but all of them require special manufacturing and are expensive, or require a special attachment device to be installed over the entire length of the wire after the wire is installed. There were problems in that the installation work was complicated because the rings had to be attached and the strands had to be wound around the wires, and the whole pair was expensive.

Considering this, all of the conventional technologies prevent snow from falling by changing the outer shape of the wire and causing abnormal behavior in the outer circumference of the wire due to its own weight when snow falls on the wire. The idea is to change the external shape of the wire into various shapes different from its original shape, and it is based on passive thinking.

The inventors changed from the conventional passive thinking to active thinking and succeeded in developing a completely new snow accumulation prevention method and a device therefor.

When we drop snow that has adhered to the striatum on the ground, we do not attach any rings or wrap it around strands of wire, but instead apply shock vibrations by hitting it with a stick.

We know from experience that this is the easiest and most reliable way to remove snow. However, even though the wire body is the same, when it comes to overhead power transmission lines, the situation changes completely, and such commonly used means disappear from our minds.
The current situation is that we are forced to spend a lot of money and time to change the external shape. This is because they learned that there is no such thing as a stick that can strike a power line that is strung up high and carries a high voltage current, causing shock vibrations and causing snow to fall. However, the inventors took a big leap forward in their thinking and instead of hitting the wire with a stick, they attached a weight piece to the wire to generate shock vibrations, and the vibrations were transmitted to the wire. It was discovered that the snowfall effect can be exerted.

FIG. 1 is an explanatory diagram showing one embodiment of a device for generating such impact vibrations. W is an electric wire, and is made of, for example, a steel core aluminum stranded wire. Reference numeral 1 denotes a heavy piece made of, for example, iron, and the weight piece 1 is supported by a spring 3 on a support frame 2 fixed to an electric wire W.

The weight piece 1 has a support shaft 4, and a piece 5 serving as a stopper is fixed to one end, and as shown in the figure, there is a predetermined distance of movement up and down, so that the weight piece 1 can be rebound by a spring 3. There is. Reference numeral 6 denotes an operating piece that is attached to the weight piece 1 via a bearing 7. In this embodiment, it has a crank shape as shown in the figure, but the operating piece is not limited to this. Any cam or other material that is in contact with the piece 1 may be used as long as it has a downward action on the weight piece 1 and can release the acting force all at once.

The operating piece 6 is connected to a driving punch 8, and a clutch K is connected to the driving punch 8.
A motor M is connected to the clutch K, and the motor M is electrically connected to a current transformer CT.

Next, the operation of this device will be explained.

Since the electric wire W is energized, an induced current is generated in the current transformer CT', which causes the electric motor M to rotate and the drive punch 8 to be rotated via the clutch K.

The crank-shaped operating piece 6 thereby rotates about the driving punch 8. When the crank-shaped operating piece 6 rotates from top to bottom in the figure, the clutch K is engaged and the weight piece 1
is pushed down while resisting the elastic force of spring 3. Weight piece 6
When it reaches its maximum point and begins to rotate upward in the figure, the clutch K is suddenly disengaged, the driving force of the drive village 8 is released, and the operating piece 6 enters a free rotation state. In this way, the weight piece 1 is repelled by the spring force of the compressed spring 3 and is pushed back with an impact together with the operating piece 6, and the support frame 2
generate a collision vibration and transmit the vibration to the electric wire W,
The snow will fall from the wire in the same way as when you hit it with a stick. The cycle of such vibrations will depend on the amount of snowfall, but generally once a minute to once every five minutes is sufficient.
Therefore, a small electric motor such as a micromotor with a speed reducer can be used, and the device will be much smaller than expected.

Since induced current is used as the drive source, as long as the wire is energized, there is an unlimited power source, and it is also possible to use a portion of this current to install a heater around the device to prevent freezing at low temperatures. . In addition, by attaching a thermostat to the electric motor, it operates when it is cold during snowfall (it can also sense snow and operate at 0°C), and disables it on days when there is no snow, thereby eliminating unnecessary operations. can.

Furthermore, if the device itself is made removable with a live wire, installed only during the snowy season, and removed for maintenance and inspection during other seasons and stored, it is possible to greatly extend its service life. It goes without saying that the above embodiment merely shows one embodiment, and that various changes can be made within the scope of the technical idea of the present invention.

With the method and device according to the present invention, ■
The power transmission line can be of the conventional shape and the conventional overhead wire, and it can be applied to all lines, regardless of whether it is an existing line or a newly constructed line.

■ Mechanical vibration causes the snow to fall,
Compared to conventional technology that relies only on the behavior of the snow itself, it is possible to cause lightning to strike more reliably.

■ The snow accumulation prevention device itself can be attached to and detached from the power transmission line, so it can be installed only during the snowy season.

Therefore, in conventional cases, rings and spiral wires are installed outside of the snow removal season, which can expose them to unnecessary wind pressure, shorten their lifespan due to weather resistance, and cause corrosion to progress near the contact between the attachment and the wire. Any defects caused by this will be completely eliminated. The effects it has on industry are extremely large.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of a snow accretion prevention device. 1: Weight piece, 2: Support frame, 3: Spring, 6: Operation piece, 8
: Drive village, K: Clutch, M: Electric motor, CT: Current transformer,
W: Electric wire. Soup 1 figure

Claims (1)

[Claims] 1. A support frame that can be fixed to an electric wire, a weight piece that is supported by a spring on the support frame and has a movement margin that can move against the spring force, and a weight piece that is attached to the weight piece and that is able to deflect itself. an actuating piece capable of deflecting the weight piece along a moving range; a clutch attached to the actuating piece and capable of releasing the deflection of the actuating piece all at once at a predetermined deflection position; and a clutch that is driven by the actuating piece. A power transmission line snow accumulation prevention device consisting of an electric motor that applies power and a current transformer that extracts electric power from the power transmission line by induction to supply the electric power to the electric motor.