JPH0793780B2 - Anti-icing snow prevention device for electric wires - Google Patents

Description

TECHNICAL FIELD The present invention relates to an ice accretion prevention device for positively removing ice and snow adhering to an overhead power transmission line, for example.

[Prior art and problems] When icing snow occurs on an electric wire, the electric wire may be broken depending on the extent and mode of the electric wire, or so-called galloping may occur to cause a short circuit between phases. In the worst case, the supporting tower is collapsed. It causes various obstacles, and in the snowy region, there are no reports of such accidents every winter.

Therefore, attempts to prevent icy snow from accumulating on electric wires, which causes such obstacles, have been proposed for a long time. In the case of a covered wire, a considerable effect has been confirmed by forming a fin-shaped projection on the outer periphery of the covered insulator. However, it is difficult to form such protrusions in the case of a bare wire, especially an overhead transmission line, and there is still a lack of proposals that can provide a sufficient effect.

As shown in FIG. 3, rings 10 are attached to the outer periphery of the power transmission line 1 at predetermined intervals to prevent snow accretion.
Under certain weather conditions, the snow 20 accreted on the wire 1 will
While moving in the direction of the arrow in FIG. 3 along the twisted groove, the outer periphery of the electric wire 1 is slid downward. Therefore, if the ring 10 that acts as a stopper against the movement of snow is attached to the end of the snow that is going to move along such a twist groove,
It is based on the knowledge that the snow 20 is prevented from moving and the snow 20 loses its balance due to its own weight and falls as 20 'in FIG.

However, the snowfall phenomenon caused by the ring 10 as described above is premised on that the electric wire itself is not twisted. When the twisting moment is generated in the electric wire 1 by the weight of the snow, the weight of the snow is changed by the electric wire. Not only will it be consumed by twisting and falling down as desired, but the effect of the ring 10 will be greatly diminished, and it will not be useful in preventing snow damage. For this reason, in this ring mounting system, an attempt has been made to prevent the twisting of the electric wire by attaching a heavy damper to the central portion of the electric wire so that the electric wire does not twist.

However, the climatic conditions in which icing snow occurs vary widely, and under the weather conditions in which wind blows from the lateral direction of the electric wire 1 as shown by the arrow in FIG.
It grows in the wing shape as shown in Fig. 20 "in Fig. 4 in the lateral windward direction. In this case, if the wire 1 is twisted, the snow growth will be uniform, unlike the case described above. It is convenient, and if the above-mentioned damper is attached to the electric wire 1 to prevent the electric wire 1 from being twisted, the wing 20 ″ will grow more and more,
Lifting force is generated on the electric wire 1 by the wing 20 ″, which leads to large galloping.

As mentioned above, the prevention of icing and snow on the transmission line is by no means a straightforward matter, and the fact is that the people concerned are having a hard time with this. From the above, there is also a proposal that a heater is wound around the electric wire to melt snow. However, snowmelt over long distances requires a lot of power and for the moment this proposal is very unlikely to be feasible.

[Object of the Invention] In view of the above situation, the present invention intends to provide a device for preventing icing and snow accretion on an electric wire, which can prevent icing and snow accumulating on the electric wire irrespective of weather conditions at that time. is there.

[Summary of the Invention] That is, according to the present invention, a spiral rod is loosely wound around the outer circumference of an electric wire, and the spiral rod is configured to be rotatable or linearly movable. The purpose of the connection is to connect the spiral rods with a drive when the icing snow may occur, thereby actively scraping off the snow.

[Examples] The present invention will be described below based on Examples.

FIG. 1 is an explanatory view showing a state in which the electric icing and snow accretion prevention device according to the present invention is attached to the electric wire 1.

The spiral rod 2 is fitted to the electric wire 1 as shown in the drawing, but the spiral rod 2 is not closely wound around the electric wire 1, and the spiral rod 2 is shown in FIG. As can be seen from, there is a small gap δ between the electric wire 1 and the spiral rod 2. Since the gap δ is provided, the spiral rod 2 can rotate the outer circumference of the electric wire or make a linear motion.

To the one end of the spiral rod 2 fitted as described above, a driving device 6 for imparting rotational or linear movement or a mixed movement of the two is connected to the one end of the spiral rod 2.
The motor 4 is connected via the clutch 5. Electric wire 1
In order to scrape off the snow adhering to the surface, the motor 4 is operated and the driving device 6 is used to give the spiral rod 2 a rotational or linear motion. The capacity of 4 does not necessarily have to be large. In order to drive the motor 4, electricity may be stored in a normal battery or a solar battery. However, if the current from the current transformer 3 is used as a drive source,
Since the energization current of the electric wire 1 is utilized, it becomes easier to obtain the drive source.

On the other hand, since the spiral rod 2 needs to move only when there is a risk of icing snow, it is preferable to provide a switch mechanism for this. Such a switch mechanism may be wired or wireless. In some cases, it may be automatically turned on / off in combination with a snowfall sensor.

The length of the spiral rod 2 may be long from the beginning, but if the short rods are connected,
Even if the worker does not ride on the electric wire in the air and fits the electric wire, the electric wire 1 can be sequentially attached to the electric wire on the tower, and the electric wire 1 can be attached by pushing it out.

If the stopper 7 is attached to the outer periphery of the electric wire 1 on one side of the spiral rod 2 which is the free end, it is possible to prevent the spiral rod from falling due to slippage. .. Further, the stopper 7 also has an effect of promoting falling of snow.

Since the ice-and-snow prevention device according to the present invention is configured as described above and uses the power drive device that uses electric power, the spiral rod for scraping off is different from the device that depends on the own weight of the ice-and-snow. There is no concern that it will stop moving and will not be affected by the properties of snow and ice and weather conditions, and the expected effect of preventing snow accretion can be demonstrated.

[Effects of the Invention] As described above in detail, according to the anti-icing and snow prevention device of the present invention, it is possible to perform sufficient snowfall without using a large capacity, while using electric power. Therefore, conventional problems such as snow falling and snow falling can be solved, and it is extremely significant that drastic measures can be taken against icing snow on electric wires with high reliability.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of an ice accretion prevention device according to the present invention, FIG. 2 is a sectional view taken along the line AA ′ in FIG. 1, and FIG. FIG. 4 is an explanatory view showing another form of icing snow. 1: Wire, 2: Spiral rod, 4: Motor, 5: Clutch, 6: Drive device, 7: Stopper.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Yoshiro Sano, 1500 Kawajiri-cho, Tsuchiura-shi, Ibaraki Hitachi Cable Co., Ltd. Toyoura factory (56) References JP-A-60-148315 (JP, A) JP-A-48 -50284 (JP, A) Actual opening 59-34433 (JP, U) Actual opening 61-192631 (JP, U) Actual opening 54-9954 (JP, Y2)

Claims (3)

[Claims] 1. A spiral rod which can be fitted to an electric wire and has an inner diameter larger than the outer diameter of the electric wire, and an electric force capable of imparting rotation or linear motion to the spiral rod with at least one end thereof being a free end. A device for preventing icing and snow from accumulating on electric wires, which has a power drive unit using 2. The icing and snow prevention device according to claim 1, further comprising a current transformer as a power source and a motor driven by the current of the current transformer. 3. The ice accretion prevention device according to claim 1, further comprising a stopper on the free end side of the spiral rod.