JPH0432112A - Earthquake-proof insulator device - Google Patents

Abstract

PURPOSE:To improve an earthquake-proof characteristic by providing a container at the top of an insulator device, and providing a weight, a sliding mechanism for free movement of the weight in a horizontal direction and spring devices in the container. CONSTITUTION:An earthquake-proof mechanism 3 consist o a cylindrical container 4 with a bottom, which is provided in the center of the top side end of an insulator device a weight 5 provided in the container 4, casters 6, which work as a sliding mechanism supporting the weight 5 so as to move free in the horizontal direction of the insulator device, and spring devices 7 provided between the weight 5 and the side wall 4a of the container 4. As the spring devices 7, 4 sets are provided, having same spring constant each other, and these respective spring devices 7 are supported by spring holding members 8 and spring holding members 9 respectively. Now, when an earthquake happens, owing to the inertia of the weight 5, the weight 5 moves in the reverse direction relatively to the swing of the insulator device, and its force is transferred to the wall 4a via the spring devices 7 and the swinging amount of a station post insulator 1 is reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a station post insulator having an earthquake-resistant function;
This invention relates to earthquake-resistant insulator devices such as insulators.

[Prior art] In general, earthquake motion is unstable in magnitude, predominant frequency, waveform, and direction. Therefore, to accommodate this, earthquake-resistant measures must be taken for tower-like structures using station post insulators and insulated pipes. There is a need.

Due to its structure, seismic measures for the above-mentioned tower-like structures do not particularly take into account vertical vibrations among seismic motions (though countermeasures against horizontal vibrations are particularly required).

Normally, the strength of station post insulators and insulator tubes is designed to be sufficiently strong by static calculations when there is no resonance, so the strength of station post insulators and insulator tubes is designed to be strong enough when resonating with earthquake motion or quasi-resonating. This is the problem above.

However, the dominant frequency that is a problem in earthquake motion is generally 0.5 to 10, and the natural frequency of large electrical equipment with ultra-high voltage or higher falls within this range, and is likely to cause resonance or quasi-resonance with earthquake motion. may occur.

If resonance or quasi-resonance occurs with earthquake motion, the station post insulator and insulator tube will shake significantly, and since the station post insulator and insulator tube are made of porcelain, there is a risk of them being destroyed.

Therefore, in order to deal with such problems, the following countermeasures have been considered.

The first measure is to make the station post insulator, insulator tube, etc. thicker, thicker, and larger.

The second measure is to manufacture station post insulators, insulator tubes, etc. using strong porcelain.

The third measure is to use a two-pillar, triangular pyramid, or four pyramid structure in the case of a station post insulator.

The fourth measure is, in the case of insulator pipes, to attach a stay with a long insulator sandwiched between them from the top.

[Problem to be solved by the invention] However, with the first measure, not only is there a manufacturing limit, but the weight of the station post insulator, insulator pipe, etc. themselves increases, and the seismic strength does not increase proportionally. There is a problem. Furthermore, there is a problem in that the inherent strength of porcelain tends to decrease as the volume increases.

The second measure has the problem that there is a limit to the increase in the inherent strength of the porcelain itself, and the stronger the porcelain, the smaller the dimensional limit in manufacturing.

The third and fourth measures have problems in that they become structurally complex and require space for large installations.

In addition, any of the above measures results in high costs.

Therefore, in view of the limitations of conventional earthquake resistance, the present invention provides an earthquake-resistant insulator device that has a simple structure and does not require a particularly large installation space, and can further improve earthquake resistance. is intended to provide.

[Means for Solving the Problems] In order to solve the above object, in the present invention, a storage chamber is provided at the top of the insulator device, a weight is provided in the storage chamber, and the weight is moved in the horizontal direction of the insulator device. The gist is that a sliding mechanism is provided to allow the weight to move freely, and a spring device is provided between the weight and the side wall of the storage chamber.

[Function] In the present invention, when an earthquake occurs, the inertia of the weight causes the weight to move in a direction opposite to the shaking of the insulator device, so this moving force is transmitted to the side wall of the storage chamber via the spring device. This reduces the amount of vibration of the insulator device and reduces the stress acting on the insulator device.

[First Embodiment] Hereinafter, a first embodiment in which the present invention is embodied in a station post insulator will be described with reference to FIGS. 1 to 4.

As shown in FIG. 1, the earthquake-resistant insulator device of this embodiment includes a station post insulator 1 erected on a base (not shown), an electric wire support section 2 provided at the upper end of the station post insulator 1, and an electric wire support section 2 provided at the upper end of the station post insulator 1. It consists of an earthquake-resistant mechanism 3 provided on a support part 2.

As shown in FIGS. 2 and 3, this earthquake-resistant mechanism 3 includes a bottomed cylindrical storage chamber 4 provided at the center of the upper end of the insulator device,
A weight 5 provided in the storage chamber 4, casters 6 serving as a sliding mechanism for supporting the weight 5 so as to be movable in the horizontal direction of the insulator device, and the weight 5 and the side wall 4a of the storage chamber 4. and a spring device 7 provided between the two.

The weight 5 has a cylindrical shape made of heavy metal (made of Fe, Cu, Pb, etc.), and a plurality of casters 6 are attached to the lower surface of the weight 5, so that the weight 5 can be moved into the storage chamber 4. It can be moved freely on the bottom surface of the

There are four spring devices 7 having the same spring constant, and each of these spring devices 7 has a spring receiver welded to the side wall 4a by a member 8, and a spring receiver welded to the weight 5 by a member 9. Each is supported. or,
Each spring device 7 is 90 degrees from each other about the central axis of the weight 5.
It is located at a different position. Each of these spring devices 7
As a result, a pulling force always acts on weight 5, and weight 5
is always located on the axis of the station post insulator 1.

To explain this spring device 7 in detail, as shown in FIG. For spring attachment, one end of the first tension member 12 is fixed to the plate 11.

The first tension member 12 is loosely inserted into the through hole 11a of the plate 11 when the spring is attached to the inside of the compression coil spring 10 and the side wall 4a, and the other end is locked to the member 8 at the spring receiver on the side wall 4a. There is. Further, for mounting the spring on the side wall 4a side, a branched end, which is one end side of the second tension member 13, is fixed to the plate 11, and this second tension member 13 is attached to the compression coil spring 10 and the second tension member 13. The spring on the weight 5 side is loosely inserted into the through hole 11a of the plate 11, and the other end of the spring receiver on the weight 5 is locked to the member 9.

In the spring device 7 configured in this way, the second tension member 13 always biases the weight 5 toward the side wall 4a by the biasing force of the compression coil spring 10, and the lth tension member 12 always biases the weight 5 toward the side wall 4a by the bias force of the compression coil spring 10. The biasing force relatively biases the side wall 4a toward the weight 5 side. Further, when the weight 5 moves to the opposite side wall 4a, the second tension member 13 is moved to the compression coil spring 1.
The weight is moved to the weight 5 side against the urging force of 0. At this time, the force acting on the compression coil spring 10 is transmitted to the side wall 4a via the first tension member 12.

Now, in the earthquake-resistant insulator device of this embodiment, when an earthquake occurs, the inertia of the weight 5 causes the weight 5 to move in the direction opposite to the shaking of the insulator device, so the force and the spring device 7 move.
The vibration is transmitted to the side wall 4a via , reducing the amount of sway of the station post insulator 1, and reducing the stress acting on the station post insulator 1.

Moreover, since the spring device 7 utilizes a compression coil spring 1O which is a non-linear spring, the natural frequency of the weight-spring system changes depending on the amount of deflection.

Therefore, the dominant frequency of the earthquake motion and the natural frequency of the weight-spring system do not match and cause resonance or quasi-resonance, which has the opposite effect of increasing the amount of shaking of the station post insulator 1. There is no fear.

In this way, the earthquake-resistant insulator device of this embodiment has a simple structure, does not require special installation space, can increase earthquake resistance against earthquake motion, and is more difficult to break due to earthquakes. There is an effect. Moreover, since it has a simple structure, it can be manufactured at low cost.

[Second Example] Next, the present invention will be applied to a gas bushing 22 containing SFa gas.
Regarding the earthquake-resistant insulator device of the second embodiment, which is embodied in an insulator tube 22a which is a component of the present invention, only the differences from the first embodiment will be explained with reference to FIGS. 5 to 7.

As shown in FIGS. 6 and 7, the sliding mechanism in this embodiment includes a large number of rollers 21 spread over the bottom surface of the storage chamber 4 instead of the casters 6 in the first embodiment. . The action of the rollers 21 allows the weight 5 to move freely in the horizontal direction of the insulator device.

In this embodiment, the weight 5 moves more smoothly than in the first embodiment. Other seismic effects and the like are the same as in the first embodiment.

Note that in this embodiment, the internal structure of the insulator tube 22a changes depending on various electrical devices.

Note that the present invention is not limited to the above embodiments,
For example, it is also possible to do as follows.

(b) Section 1 above. Compression coil spring 1 in 2 embodiments
0, use a linear spring such as a uniform pitch spring instead of an uneven pitch spring.

This is effective when there is no risk of resonance or quasi-resonance between the seismic motion and the vibration system of the weight-spring system.

(b) Use bamboo shoot springs instead of unequal pitch springs as nonlinear springs.

(c) Providing two, three, or five or more spring devices 7.

[Effect of the invention] As detailed above, the present invention has a simple structure,
And the extra large installation doesn't require much space,
This has the excellent effect of further improving earthquake resistance.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of an earthquake-resistant insulator device in which the present invention is embodied in a station post insulator, FIG. 1 is a sectional view of a main part of the same earthquake-resistant insulator device, and FIG. 2 is an enlarged sectional view of a main part. , 3rd
The figure shows a sectional view taken along the line X-X of Fig. 2, Fig. 4 shows an enlarged sectional view of the spring device, and Figs. FIG. 5 is a cross-sectional view of a main part of the earthquake-resistant insulator device, FIG. 6 is an enlarged cross-sectional view of a main part, and FIG. 7 is a cross-sectional view taken along the line Y--Y in FIG. 6. Storage chamber 4, side wall 4a, weight 5, caster 6, spring device 7, roller 21° Patent applicant Nippon Insulator Co., Ltd. Agent Patent attorney Hironobu Onda (and one other person) Figure 1 Figure 61! ! ! 1

Claims (1)

[Claims] 1. A storage chamber (4) is provided at the top of the insulator device, and the storage chamber (4) is
4) A weight (5) is provided in the interior, and a sliding mechanism (6, 21) is provided to allow the weight (5) to move freely in the horizontal direction of the insulator device, and the weight (5) and the storage chamber ( 4)
An earthquake-resistant insulator device characterized in that a spring device (7) is provided between the side wall (4a) and the side wall (4a).