JPH03655Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is intended to prevent flashover accidents caused by birds such as crows, kites, and cormorants approaching insulators on power transmission towers. This invention relates to a bird damage prevention device.

(Prior art) It is believed that the above-mentioned flash-flash accidents caused by birds as a medium account for a considerable portion of power outage accidents of unknown cause, and in particular large birds are involved in the arcing horns of insulators. It has been found that the majority of accidents occur when the tip of the wing comes into contact with the arcing horn on the opposite side when the aircraft stops and extends its wings. Such accidents are called bird damage, and various prevention devices have been devised to prevent them, but the representative one is shown in Utility Model Application Publication No. 147113/1983. The arcing horn was covered with an insulating cover to prevent birds from coming into contact with the arcing horn. However, such insulating covers need to be molded into a complex shape that matches the shape of the arcing horn, so they are made of resin materials such as vinyl chloride that are easy to mold, and therefore have poor weather resistance. Its lifespan is 3.5% due to poor quality and deterioration during use and reduced insulation properties.
It is said to take about 5 years. In addition, with conventional devices like this, if a flash short circuit occurs due to a lightning strike or the insulator is contaminated, and an arc occurs, the cover will burn due to the high heat of over 2000℃, producing soot, and the insulator will become contaminated, causing electrical damage. In addition to the risk of deteriorating the characteristics, the cover was deformed by the high heat, inhibiting the formation of an arc, affecting the flash characteristics of the arc horn, and causing damage to the insulator. For this reason, conventional bird damage prevention devices not only require inspection every time there is a flash circuit, but also need to be replaced periodically every 3 to 5 years, and the maintenance work and associated economic burden is large. It was hot.

(Problems to be solved by the invention) The present invention solves the above-mentioned conventional problems, can almost completely prevent bird damage, and also improves the arcing horn's flash characteristics, arc resistance, etc. It was completed with the aim of creating a bird damage prevention device that would not damage the birds.

(Means for Solving the Problems) The present invention consists of a ceramic honeycomb in which communicating holes are aligned in the longitudinal direction of the arc horns on the outer periphery of one or both tips of the arc horns facing each other across the insulator chain. It is characterized in that an insulating member is attached.

(Embodiment) Next, the present invention will be explained in detail with reference to the illustrated embodiment.In the first embodiment shown in FIG.
2 is an insulator chain, 2 is a mounting bracket for attaching the insulator chain 1 to a steel tower arm, and 3 is a clamp for holding a power transmission line. Reference numerals 4 and 5 are arcing horns that are provided facing each other with such an insulator chain 1 in between, and in this embodiment, an insulating member 6 made of a ceramic honeycomb is attached to the tip of one of the arcing horns 4. .

The ceramic honeycomb used as the insulating member 6 is not particularly limited in its material or pore shape, but the coefficient of thermal expansion must be It is advantageous to use ceramic honeycombs of low cordierite type. Further, such an insulating member 6 is attached to the arc horn 4 with the communication holes of the honeycomb aligned in the longitudinal direction of the arc horn 4, as shown in FIG. If the insulating member 6 is installed in such a direction, the thermal gradient at the time of arc generation will occur in a direction perpendicular to the communicating holes 7 of the honeycomb, but there are many independent communicating holes 7 in this direction. Because of the presence of
Even if the inner part melts due to the high heat of the arc, the outer peripheral part is not affected, and the shape of the insulating member 6 is stably maintained almost as it is.

As shown in FIGS. 2 and 3, the insulating member 6 made of ceramic honeycomb has an inverted U-shaped cross section with an opening 8 formed on the lower surface facing the insulator chain 1, and a smooth tip end. It is preferable to expand the diameter. The opening 8 is provided to smoothly transfer the arc generated along the surface of the insulator to the tip of the arc horn 4, and the diameter of the tip is enlarged to prevent arc generation between the arc horns 4 and 5. This is to prevent it from happening. The distance L between the tip of the arc horn 4 and the end surface 9 of the insulating member 6 is such a distance that the insulation gap can still withstand the ground voltage of the power transmission line even if the tip of the wing of a bird perched on the arc horn 5 comes into contact with it. Specifically,
The length shall be at least 30mm for 33KV transmission lines and 70mm or more for 66KV transmission lines.
Further, when the insulating member 6 is attached only to the tip of one arcing horn 4 as in this embodiment, when a bird perches on the insulating member 6 and its toe touches the arcing horn 4, the other arcing horn 5 is attached. Since there is a risk of a flashover occurring between the insulating members 6 and 6, it is preferable to install a needle 10 made of an insulating material, for example, on the upper surface of the insulating member 6 to prevent large birds from perching thereon.

In order to attach such an insulating member 6 to the tip of the arc horn 4, an L-shaped branch 11 is provided at the tip of the arc horn 4 as in the first embodiment, and this branch 11 is made of a ceramic honeycomb. Insulating member 6
In addition to the method of fixing with an adhesive such as cement, a pipe-shaped attachment part 13 with a tightening bolt 12 is provided on the insulating member 6 side as in the second embodiment shown in FIGS. 4 and 5. Many attachment methods can be considered, such as a method of attaching the insulating member 6 to the tip of the arc horn 4 by utilizing this. Since the mounting method of the second embodiment does not require any processing on the arc horn 4 side, there is an advantage that the existing arc horn can be used as is.

In the third embodiment shown in FIGS. 6 and 7, the needle 10 implanted on the upper surface of the insulating member 6 is shaped like a transparent pipe, and the inside of the needle 10 is coated with thermopaint 14. Such thermo paint 14 irreversibly changes color due to the heat generated during flash flashing to produce a flash display effect.Although not shown in the drawings, the needle is made of a shape memory alloy and its shape changes with heat. It is also possible to have a structure in which Furthermore, as mentioned above, since these needles 10 are used to prevent birds from perching on them, the lower end of the insulating member 6 is fixed as in the fourth embodiment shown in FIGS. The needle 10 can also be omitted if it is sufficiently extended below the arcing horn 4 to prevent the bird's toe from approaching the arcing horn 4.

(Function) With this structure, even if a bird perches on one arc horn 5 spreads its wings and its wing tips try to contact the tip of the other arc horn 4,
Since the insulating member 6 attached to the outer periphery of the tip of the arc horn 4 prevents contact between the blade tip and the arc horn 4, flashover accidents can be prevented. Furthermore, in the present invention, a ceramic honeycomb with excellent heat resistance properties is used as the insulating member 6, so the insulating member 6 is not affected by the arc caused by lightning strikes or contamination, and the flashing of the arc horns 4 and 5 does not occur. There is no deterioration in characteristics or loss of arc resistance, and since soot is not generated due to the high heat of the arc, the electrical characteristics do not deteriorate even if exposed to arc. Furthermore, in the present invention, since the communication holes 7 of the ceramic honeycomb are aligned in the longitudinal direction of the arc horn 4, the spaces and partition walls of the honeycomb are arranged alternately in the direction perpendicular to the arc horn 4. With this overlapping structure, even if a bird comes into contact with the outside of the insulating member 6, sufficient insulation can be maintained between it and the arc horn 4 inside, and even when an arc occurs, the space and the partition wall prevent heat. absorb shock,
This has the effect of preventing uneven heat damage. In addition, the insulating member 6 made of ceramic honeycomb used in the present invention has other advantages such as being lightweight, having excellent weather resistance, and having a semi-permanent lifespan, which reduces maintenance work and costs. It is also advantageous.

(Effects of the invention) As is clear from the above explanation, the present invention can prevent bird damage, eliminates the risk of damaging the flash flash characteristics and arc resistance characteristics of the arc horn, and is free from ceramic honeycomb. The insulating material does not deteriorate even after being used outdoors for many years, so there is no need for short-term replacement as with conventional products, and there is no risk of soot generation even if an arc occurs due to lightning strikes or contamination. It has many advantages such as no risk of damage due to heat. Therefore, the present invention has extremely great practical value as a bird damage prevention device that eliminates the conventional problems.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing the first embodiment of the present invention, Fig. 2 is a partially cutaway front view of the main part, Fig. 3 is a partially cutaway side view thereof, and Fig. 4 is a partially cutaway front view of the main part. 5 is a partially cutaway side view of the main part of the third embodiment, FIG. 6 is a partially cutaway front view of the main part of the third embodiment, and FIG. 7 is a partially cutaway front view of the main part of the third embodiment. FIG. 8 is a partially cutaway front view showing the main parts of the fourth embodiment, and FIG. 9 is a partially cutaway side view thereof. 1... Insulator Ren, 4, 5... Archhorn, 6...
...Insulating member, 7...Communication hole.

Claims (1)

[Scope of utility model registration request] Arc horns 4 and 5 facing each other with insulator chain 1 in between
A bird damage prevention device characterized in that an insulating member 6 made of a ceramic honeycomb with a communication hole 7 aligned in the longitudinal direction of the arc horn 4 is attached to the outer periphery of one or both of the tips.