JPH0132647Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a multiple insulator device using a long-stem insulator.

As insulators for power transmission lines in desert areas, we use multiple long-bore insulators with a streamlined shape called aero hats, which prevent sand from adhering to them, in order to prevent deterioration of electrical insulation performance due to sand adhesion and clogging. Generally, two or more series-connected insulators arranged in parallel are used, but with conventional insulators of this type, for example, when constructing a power transmission line, when attaching electric wires to the insulator device, workers have to If the long insulator of one of the two insulator chains breaks due to an unexpected accident, such as a tool such as a spanner accidentally dropped from the insulator unit hitting the lower insulator unit, the insulator yoke will rotate downward due to the weight of the wire. As the electric wire falls by the amount of rotation of the yoke, the impact causes the other healthy insulator link to receive a bending moment of inertia as it approaches the broken insulator link, as well as an impact tensile load that is increased several times. , Moreover, the number of insulators on the broken side is 1.
Due to its own weight of about 300 kg per row and the weight of several thousand kg of electric wires, it is suddenly pulled downward and falls. that time,
Because the movement of the broken insulator chain does not fall vertically but in a meandering manner, the intermediate horn of the broken side insulator chain or the cap metal fitting of the long stem insulator collides with the cap of the long stem insulator of the healthy insulator chain. Since impact bending load is applied,
There is a risk that even the long trunk insulators of a sound insulator chain will be instantly destroyed, causing the electric wires and insulator devices to fall, and even the electric wires and insulator devices to fall, resulting in personal injury to ground workers or a secondary accident such as the collapse of a steel tower.

The present invention was completed with the aim of producing an insulator device that solves the above-mentioned problems.Hereinafter, the present invention will be explained in detail using a double-length stem insulator device for 380KV as shown in the drawings as an embodiment.

1 is a long-stem insulator, and the long-stem insulators 1 are connected in series by three right-angled links 2 to form two series of insulators 3, and each insulator series 3 has its upper part connected to a clevis eye 4 and another connection. It is attached to the lower end of the tower arm 5 via metal fittings at a predetermined interval in the direction of the power transmission line, and the lower part is connected via a clevis eye 6 with a triangular insulator link yoke 7. In this case, a substantially U-shaped conductor yoke 9 in which four suspension clamps 8 are connected in a square arrangement is connected at right angles to the insulator chain yoke 7 by a connecting fitting, and the above points are the same as in the conventional insulator device of this type. However, the connecting points of the long insulators of the adjacent insulator chains 3, 3 are connected to each other by a buffer spacer 10 that deforms by absorbing the impact force when one of the insulator chains 3 breaks and falls. ing. That is, the buffer spacer 10 used in the illustrated embodiment has an elongation of 21% and a yield point to tensile strength ratio of approximately
Connecting portions 11, 11 are provided at both ends of a round bar made of 58% general structural rolled steel material, and its bending failure moment is approximately the same as the bending failure moment of the long insulator 1, and each connecting portion 11 is Each insulator 3,
It is connected to the upper and lower clevis caps 12, 12 of the long trunk insulators 1, 1 located at the center of the insulators 3 using insulator connecting pins 13. In this connection, the buffer spacer 10 itself comes into contact with some kind of stopper part 14 and is not freely rotated in the axial direction of the insulator chain 3. The reason why the buffer spacer 10 is installed at the upper and lower clevis caps 12, 12 of the long insulators 1, 1 located at the connecting points of each long insulator, that is, in the center of the insulator chain is because the insulator connecting pin 13 is attached to the buffer spacer 10. By also serving as a connecting pin for the upper clevis cap 12, it is possible to reduce the number of components and simplify the insulator device.
By using the clevis base of the buffer spacer 10 as a stopper part 14 that restricts vertical rotation, two parallel insulator chains 3, 3
Even if one of them breaks, it prevents a collision with another healthy insulator chain 3, and the shock load caused by the falling wire is borne by the buffer spacer as a bending load, and its bending elastic energy alleviates the shock load. This prevents the remaining healthy insulators 3 from being destroyed. Therefore, it is essential that the strength of the buffer spacer 10 be equal to or less than the bending moment of failure of the long insulator 1, and that the material thereof deforms before being bent and broken. In addition, in order to select the material for this buffer spacer 10, we used various materials with different elongation and compared their characteristics.We found that porcelain with very small elongation, aluminum casting with about 3% elongation, or aluminum casting with elongation of 10%.
When an impact load is applied to front and rear castings such as malleable cast iron, the buffer spacer 10 breaks before absorbing the kinetic energy due to the falling wire, which is effective in preventing collisions between the insulator chains 3 and 3 or mitigating the impact load. Since it was effective when the buffer spacer 10 was made of a material with less elongation and an elongation of 15% or more, it is preferable that the buffer spacer 10 is made of a material with an elongation of 15% or more. In the above embodiment, the cross-sectional shape of the buffer spacer 10 is circular, but the cross-sectional shape may be rectangular, square, or cylindrical, and the cross-sectional shape is not limited thereto.

With this structure, the buffer spacer 10 is deformed by absorbing the impact force when one of the insulator chains 3 breaks and falls between the respective long insulator connection points of the adjacent insulator series 3, 3. Even if one of the insulator chains 3 were to break due to an unexpected accident, the buffer spacer 10 would bend and connect the insulator blocks 3 on the broken side B and the healthy side, as shown in Fig. 4. Not only can collision with the insulator chain 3 of A be prevented, but the buffer spacer 10 bears the impact load caused by the falling electric wire as a bending load, and absorbs the impact load with its elastic energy, so that the impact load is not affected by the sound side. This prevents the insulator chain 3 of A from being destroyed.
Although the above embodiment is a suspended insulator device with two long-stem insulators, it may also be applied to a tension-resistant insulator device with three or four long-stem insulators, and a multiple-stem insulator device using long-stem insulators. If so, the number of insulators and the type of device are not limited, and the buffer spacer 1
The installation position of 0 is also the upper and lower clevis caps 12, 1 of the long insulators 1, 1 located in the center of the insulator series 3, 3.
For example, as shown in FIG. 5, a spacer attachment part 2a is provided at the middle part of a right-angled link 2 that connects the upper and lower long insulators 1 in series, and a spacer attachment part 2a is provided in the middle of the insulator to provide a buffer when the insulator breaks. A stopper part 14 may be provided to prevent the spacer 10 from easily rotating in the direction of the insulator link shaft, and the right-angled links 2, 2 may be connected with the buffer spacer 10. Also, the buffer spacer 10 may also be arranged in parallel. There are no restrictions on the structure and mounting position as long as it connects the insulator chains 3, 3 with a predetermined mechanical strength.

As is clear from the above explanation, even if a series of insulator chains constituting an insulator device are broken for some reason, the remaining insulator chains can be damaged due to collisions between the insulator chains or impact loads caused by falling insulator chains and electric wires. Since it can prevent destruction, it can accurately prevent secondary accidents such as the falling of electric wires and insulator equipment due to the breakage of remaining insulator chains, personal injury to ground workers, or collapse of steel towers, This type of insulator device has great practical value as it solves the problems of the device.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Fig. 2 is a partially cutaway front view of the main part, and Fig.
The figure is also a partially cutaway side view of the main part, and Figure 4 is a partially cutaway front view showing the insulator chain in a broken state.
FIG. 5 is a partially cutaway front view of main parts showing another embodiment of the present invention. 1... Long trunk insulator, 3... Insulator chain, 10... Buffer spacer.

Claims (1)

[Scope of claims for utility model registration] 1. An insulator chain consisting of a plurality of long insulators connected in series.
In an insulator device in which more than one series are arranged in parallel,
Between each long insulator connection point of adjacent insulator chains,
It is made of a material with an elongation of 15% or more that is deformed by absorbing the impact force when one insulator chain breaks and falls, and whose bending failure moment is equal to or less than that of the long insulator. An insulator device characterized in that a buffer spacer having a high bending strength is arranged in such a manner that rotation in the vertical direction is restricted. 2. The insulator device according to claim 1 of the utility model registration claim, wherein the buffer spacer is made of a material with an elongation of 15% or more, and whose bending failure moment is equal to or less than the bending failure moment of the long insulator. .