JPH0475612B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a gas circuit breaker, and particularly to a gas circuit breaker with a highly seismic structure that is safe against earthquakes.

[Background of the invention]

As shown in the side view of FIG. 5A and the front view of FIG.
0, and a bushing 4 made of an insulator is attached to a bushing branch pipe 1 formed integrally with the gas tank body 10.

Therefore, the response multiple of the bushing 4 to ground (foundation) vibration is determined by the rigidity of the gas tank body 10 and the bushing branch pipe 1, and vibrations caused by earthquakes are amplified by the bushing 4 (usually 4 times). The resulting stress is particularly applied to the connection portion with the bushing branch pipe 1, that is, the root of the bushing.

Therefore, in the event of an earthquake, there is a risk of damage to the root of the bushing, and a highly earthquake-resistant structure is required.

[Purpose of the invention]

An object of the present invention is to provide a gas circuit breaker having an earthquake-resistant structure.

[Summary of the invention]

In the present invention, the above object has been achieved by the following means. That is, the gas tank body includes a shutoff mechanism and an inert gas, a bushing branch pipe formed to protrude from the gas tank body, and a bushing flange provided at the end of the bushing branch pipe. In the grounded tank type gas circuit breaker, the bushing flange is supported by the support leg having high rigidity.

Therefore, according to the gas circuit breaker according to the present invention, the above object is achieved through the following actions. In other words, since the bushing flange that supports the bushing of the gas circuit breaker is supported by highly rigid support legs, the natural frequency of the structure from the body of the gas tank to the top of the bushing is increased, which reduces the vibration caused by earthquakes. I tried not to resonate. This prevents large stress from being generated at the joint between the bushing and the bushing branch pipe.

[Embodiments of the invention]

FIG. 1 is a configuration diagram showing an embodiment of a gas circuit breaker according to the present invention. In this figure, the same reference numerals as in FIG. 5 indicate the same materials. The structure different from that in FIG. 5 lies in the support legs 13, which support not only the gas tank body 10 but also the vicinity of the bushing 4 connection portion of the bushing branch pipe 1.

The details of the structure of the bushing branch pipe 1 in the vicinity of the bushing 4 connection part are shown in FIG. In the same figure,
The tip of the bushing branch pipe 1 formed integrally with the gas tank body 10 is a bushing flange 12.
The bushing 4 is arranged on the bushing flange 12 coaxially with the bushing branch pipe 1. A toric body having an L-shaped cross section is fitted to the side surface of the bushing 4 near the bushing flange 12, and the bushing 4 is connected to the bushing branch pipe 1 through this toric body. There is.

Further, the support leg 13 that supports the gas tank body 10 extends until it comes into contact with the bushing flange 12, so that the support leg 13
This also connects the vicinity of the connecting portion of the bushing 4 with the bushing branch pipe 1.

Note that this support leg 13 is provided with a beam 9 arranged in the horizontal direction.

In this way, in the event of an earthquake, ground shaking will be directly transmitted to the bushing 4 via the support leg 13, and will not be transmitted via the gas tank body 10 as in the conventional configuration. The vibrations are transmitted to the bushing 4 without being amplified. Furthermore, if the rigidity below the bushing flange 12 is increased by using support legs 13 (see Figure 1) that directly connect the bushing flange 12 and the foundation, seismic waves will not be amplified and will be transmitted to the root of the bushing 4. , the response multiple (see Fig. 3) is smaller than that of the conventional structure.

FIG. 3 is a graph showing the results of an experiment comparing the response multiple of vibration from the ground (foundation) to the bushing head of the gas circuit breaker shown in this embodiment with a conventional configuration. As is clear from this graph, the configuration of this embodiment can reduce the response multiple of each part compared to the conventional one, which means that the stress generated in each part can be reduced and Damage, especially bushing branch pipe 1 of bushing 4
It is possible to prevent damage at the connection part.

Incidentally, FIG. 4 shows an embodiment showing the housing structure of the bushing type current transformer in this embodiment. In the figure, a bushing type current transformer 2 is enclosed within a bushing branch pipe 1 and fixed to a current transformer support fitting 3. Further, the lead wire 11 of the current transformer 2 is drawn out to the outside via the sealed terminal 8.

〔Effect of the invention〕

As is clear from the above explanation, according to the gas circuit breaker according to the present invention, since the bushing flange supporting the bushing is supported by the support leg with high rigidity, the structure extending from the gas tank body to the top of the bushing is By increasing the natural frequency of the object and preventing it from resonating with earthquake vibrations, the response multiple of the bushing base, which is easily damaged in an earthquake, is reduced, making it possible to create an earthquake-resistant structure.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the gas circuit breaker according to the present invention, FIG. 2 is a detailed sectional view showing the main parts of the gas circuit breaker, and FIG. 3 is a diagram showing the effect of the gas circuit breaker according to the present invention. FIG. 4 is a block diagram showing another embodiment of the gas circuit breaker according to the present invention, and FIG. 5 is a block diagram showing an example of a conventional gas circuit breaker. 1... Bushing branch pipe, 2... Bushing type current transformer, 3... Current transformer support fitting, 4... Bushing, 5... Bushing shield, 6... Center conductor, 7... Sealed terminal cover, 8...Sealed terminal, 9
... Beam, 10 ... Gas tank body, 11 ... Lead wire, 12 ... Bushing flange, 13 ... Support leg.

Claims (1)

[Claims] 1. A gas tank body containing a shutoff mechanism and an inert gas, a bushing branch pipe formed protruding from the gas tank body, and a bushing flange supported at the end of the bushing branch pipe. 1. A grounded tank-type gas circuit breaker having a bushing and a support leg that supports the gas tank body, characterized in that the bushing flange is supported by a support leg with high rigidity.