JPH11122762A - Gas-insulated bus-bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated bus-bar which can absorb an internal pressure caused by insulating gas and a force caused by thermal expansion/ contraction and, further, is excellent in vibration-resistance. SOLUTION: A sliding leg S supporting a bus-bar tank 2 is composed of a sliding unit 5 and a pedestal 6. The pedestal 6 is fixed to a base beneath the bus-bar tank 2 and the bottom of the sliding unit 5 is mounted on the top surface of the pedestal 6. The sliding unit 5 can slide relatively to the pedestal 6 with sliding planes 5a and 6a therebetween. The sliding unit 5 has a horizontal beam 5b and a locking mechanism 8 having a case 11 and a receptacle 12 is provided between the beam 5b and the pedestal 6. A spring 9 and a pin 10 are housed in the case 11. The protrusion 10b of the pin 10 energized by the spring 9 is made to protrude from the lower part of the case 11 and pressed against the flat part 12a of the center of the receptacle 12. Grooves 12b into which the protrusion 10b can be inserted are formed near both the left and right ends of the pedesatal 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated bus used in a transmission line system, and more particularly to a gas-insulated bus having improved thermal expansion and contraction absorption and seismic performance.

[0002]

2. Description of the Related Art A gas insulated switchgear is constructed by accommodating main equipment such as a circuit breaker and disconnector in a metal tank filled with an insulating gas such as SF6 gas.
The gas-insulated bus bar plays a role of constituting a gas-insulated switchgear in the transmission line system, connecting the gas-insulated switchgear, and the like. Such a gas insulated bus
The buses, each containing a conductor in a metal tank filled with an insulating gas, are continuously connected, and are fixed on a base or a gantry by supporting legs.

The load applied to the supporting legs of the gas-insulated bus includes, first of all, the load of the conductor and the tank constituting the bus. In addition, the internal pressure of the insulating gas sealed in the tank generates a force in the axial direction of the bus, and the rise in temperature of the conductor due to energization and the change in the outside air temperature generate a force due to thermal expansion and contraction of the tank. Load is also applied to the support legs. Furthermore, during an earthquake, a load acts not only in the direction of the bus axis but also in a direction perpendicular to the bus axis.

[0004] Therefore, in order to reduce the load on the support legs, it is important to absorb the force or displacement generated by the internal pressure and thermal expansion and contraction. In order to cope with this, as a method of absorbing thermal expansion and contraction, for example, a gas-insulated bus bar using a spring balance bellows having elasticity is used, and an example thereof will be described below with reference to FIG. That is, the gas-insulated bus 1 includes a bus tank 2 in which an insulating gas is filled and a conductor is accommodated, and support legs 3 and 4 that support the bus tank 2 as a foundation. A spring-loaded bellows 7 having a spring attached to one side of the stud is arranged in the busbar tank 2.

[0005] Some of the support legs 4 are composed of a pedestal portion 6 fixed to the base side and a sliding portion 5 slidable on the pedestal portion 6. Gas insulated bus 1 as described above
According to the above, the axial force of the bus bar generated by the internal pressure or thermal expansion and contraction of the insulating gas is absorbed by the expansion and contraction of the spring-loaded bellows 7 and the sliding of the sliding portion 5 on the support leg 4.
The load on the support legs 3 and 4 is reduced.

[0006]

However, the prior art having the above configuration has the following problems. That is, as described above, when an earthquake occurs, a load acts not only in the direction of the bus axis but also in a direction perpendicular to the bus axis. However, the supporting legs 4 of the sliding structure have a problem in strength against the load, and the fixed legs have a problem. Therefore, it is necessary to bear the load only with the support legs 3, and the earthquake resistance is reduced.

[0007] The present invention has been proposed to solve the above-mentioned problems of the prior art.
An object of the present invention is to provide a gas-insulated bus bar that can absorb the internal pressure and thermal expansion and contraction caused by an insulating gas and has excellent earthquake resistance.

[0008]

In order to achieve the above-mentioned object, the present invention provides a method in which a bus containing a conductor is continuously connected in a tank filled with an insulating gas, and the tank is fixed. The gas-insulated busbar supported on the foundation by the legs and the sliding legs has the following technical features.

That is, the invention according to claim 1 is characterized in that a displacement restricting means for restricting a relative displacement of a certain amount or more of the tank and the foundation is provided between the tank and the foundation. And According to the above-mentioned invention, the force due to the internal pressure or the thermal expansion and contraction caused by the insulating gas can be absorbed by the sliding of the sliding legs, and even when vibration at the time of an earthquake is applied, the displacement restraining means is used. Since the displacement of the tank is prevented from becoming larger than a certain amount, the earthquake resistance is improved.

According to a second aspect of the present invention, in the gas insulated bus of the first aspect, the displacement restraining means engages with each other when the tanks move in a direction orthogonal to the bus axis. It is a lock mechanism provided with a part. According to the second aspect of the present invention, the displacement of the tank is restricted by the engagement portion of the lock mechanism even when a force in the direction perpendicular to the generatrix is applied, which becomes weak when a sliding leg is used. The earthquake resistance is improved.

According to a third aspect of the present invention, in the gas insulated bus according to the second aspect, at least one tank having a bent portion is provided, and the lock mechanism is provided in the bent portion. And According to the third aspect of the present invention, since the engagement portion of the lock mechanism restrains the displacement of the bent portion of the tank in the direction perpendicular to the axis, the earthquake resistance of the bent portion is improved.

According to a fourth aspect of the present invention, in the gas-insulated busbar of the first aspect, the displacement restraining means includes a guide fixed to a base side, and a rod having one end fixed to the tank side. The guide is formed with a groove in a generatrix axial direction, and the other end of the rod is movably inserted in the groove along the groove, and the rod has elasticity. According to the fourth aspect of the present invention,
The rod can move freely along the groove in the direction of the generatrix axis, and the movement is regulated by the groove in a direction perpendicular to the generatrix axis. Then, since the energy of vibration is absorbed by the elasticity of the rod, the deformation in the direction perpendicular to the generatrix axis of the tank is restrained, and the earthquake resistance is improved.

According to a fifth aspect of the present invention, in the gas insulated bus according to the first aspect, the displacement restraining means is a damper disposed vertically between the tank side and the base side. It is characterized by. According to the fifth aspect of the present invention, when the tank is displaced during an earthquake, the damper expands and contracts, and the damping increases, thereby improving the earthquake resistance.

According to a sixth aspect of the present invention, in the gas insulated bus of the fifth aspect, at least one end of the damper is connected to the tank side or the base side via a link, and is connected to the link. An elongated hole is formed in the fastening portion of the link so that the fastened end of the damper can slide. According to the sixth aspect of the present invention, since the end of the damper fastened to the link slides by the length of the long hole, the damper is actuated only when the displacement is larger than the length of the long hole. Can be limited.

According to a seventh aspect of the present invention, in the gas-insulated busbar of the first aspect, the displacement restraining means is a contact portion that comes into contact with the sliding leg from a direction perpendicular to a busbar axis. Features. In the above-described invention, since the displacement of the sliding leg in the direction perpendicular to the generatrix is restricted by the contact portion, the displacement of the tank during an earthquake is reduced, and the earthquake resistance is improved. .

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

(1) First Embodiment (Configuration) An embodiment corresponding to the first and second aspects of the present invention will be described below with reference to FIGS.
In addition, the engaging part described in the claim is the protrusion 10 b and the groove 1.
2b. That is, in the present embodiment, FIG.
As shown in (1), the sliding leg S supporting the busbar tank 2 is constituted by a sliding portion 5 and a pedestal portion 6. Sliding part 5
Are two legs provided vertically on the left and right sides of the lower surface of the busbar tank 2. The pedestal portion 6 is a member having a length approximately equal to the diameter of the busbar tank 2 and is fixed to a foundation below the busbar tank 2 in a direction orthogonal to the busbar axis. The bottom of the moving part 5 is mounted. Sliding surfaces 5a and 6a are provided between the bottom surface of the sliding portion 5 and the upper surface of the pedestal portion 6, and the sliding portion 5 slides on the pedestal portion 6 via the sliding surfaces 5a and 6a. It has a movable configuration.

Above the pedestal portion 6, a horizontal beam portion 5b having both ends fixed to the left and right sliding portions 5 is provided. A lock mechanism 8 is provided between the beam 5b and the pedestal 6. This lock mechanism 8
As shown in FIG. 2, includes a case 11 fixed to the beam 5 b side, and a receiving base 12 fixed to the pedestal 6 side. A spring 9 and a pin 10 are housed in the case 11.

The pin 10 has a flange 10a and a protrusion 10b provided on the lower surface thereof, and is urged downward from the upper surface of the flange 10a by a spring 9. And Case 1
A hole 11a is formed on the lower surface of 1 and a projecting portion 10b of the pin 10 urged by the spring 9 projects downward from the hole 11a.

On the other hand, the receiving base 12 has a flat portion 12a at the center thereof, and the tip of a protruding portion 10b protruding from the hole 11a of the case 11 is in contact with the receiving base 12. Further, in the vicinity of the left and right ends of the cradle 12, grooves 12 into which the protrusions 10b can be inserted are provided.
b is formed.

(Operation and Effect) The operation and effect of the present embodiment having the above configuration are as follows. That is,
The axial force of the bus bar generated by the internal pressure of the insulating gas or the thermal expansion and contraction is absorbed by the sliding portion 5 sliding in the same direction, so that the load on the sliding leg S is reduced. At this time, the protruding portion 10b of the pin 10 is
2a, the sliding of the sliding portion 5 is not restricted.

When a force is applied in a direction perpendicular to the generatrix axis during an earthquake and displacement occurs in the same direction, the protruding portion 10b of the pin 10 urged by the spring 9 is moved to one of the right and left grooves. Enter 12b. Then, the protrusion 10b is locked by the groove 12b, so that the displacement of the sliding portion 5 is restricted. Accordingly, the amount of displacement of the bus tank 2 in the direction perpendicular to the axis is limited to about the distance between the grooves 12b at both ends of the cradle 12, and the displacement during an earthquake is reduced.

(2) Second Embodiment (Configuration) An embodiment corresponding to the invention described in claim 4 is
This will be described below with reference to FIG. The description of the same members as those in the first embodiment will be omitted. That is, in the present embodiment, a displacement restraining means constituted by the guide 14 and the rod 13 is provided between the beam portion 5b of the sliding portion 5 and the pedestal portion 6.

The guide 14 is fixed to the pedestal 6, and has a groove 14a in the axial direction of the generatrix. The rod 13
The upper end is fixed to the beam portion 5b, and the lower end is inserted into the groove 14a of the guide 14. Although the upper and lower ends of the rod 13 are provided in the vertical direction, a ring-shaped bent portion 13a serving as a spring is formed at an intermediate portion.

(Operation and Effect) The operation and effect of the present embodiment having the above configuration are as follows. That is,
Since the groove 14a is provided in the axial direction of the generatrix, the rod 13 can move in the same direction, and expansion and contraction in the axis direction of the generatrix due to a temperature change are not restricted. When the rod 13 is displaced in the direction orthogonal to the bus axis during an earthquake, the rod 13 is restricted by the groove 14a, so that the displacement of the sliding part 5 is restricted. Further, when the dynamic load at the time of the earthquake increases, the energy of the vibration is absorbed by the plastic deformation of the rod 13 itself and the bent portion 13a. Therefore, displacement of the bus bar tank 2 during an earthquake can be reduced.

(3) Third Embodiment (Configuration) An embodiment corresponding to the invention described in claim 5 is
This will be described below with reference to FIG. That is, in the present embodiment, the damper 15 is provided between the sliding portion 5 and the foundation or pedestal portion 6. This damper 15
The upper and lower ends are provided so as to be able to absorb the force applied to the upper and lower ends by an internal elastic member, and the upper and lower ends are rotatably supported by the sliding portion 5 and the base or the pedestal portion 6 in a direction orthogonal to the generatrix axis. ing.

(Operation and Effect) The operation and effect of the present embodiment having the above configuration are as follows. That is,
At the time of the earthquake, the damper 15 expands and contracts with the movement of the busbar tank 2, and the energy of the vibration is absorbed. Further, by arranging the damper 15 in the up-down direction, the damper 15 hardly acts at the time of minute deformation, so that the influence on the thermal expansion and contraction is small. Therefore, while absorbing thermal expansion and contraction, displacement of the bus bar tank 2 during an earthquake can be reduced.

(4) Fourth Embodiment An embodiment corresponding to the invention described in claim 7 will be described below with reference to FIG. That is, in the present embodiment, guides 6 b are formed on the upper surfaces of both ends of the pedestal portion 6 so that the side surfaces of the sliding portion 5 abut.

According to this embodiment, the displacement in the direction of the bus axis during thermal expansion and contraction is not restricted, but the displacement in the direction perpendicular to the bus axis during an earthquake is restricted by the guide 6b. The performance is improved.

(5) Other Embodiments The present invention is not limited to the above embodiments. For example, as an embodiment corresponding to the third aspect of the present invention, a lock mechanism 8 similar to that of the above-described first embodiment is provided in a bent portion of the bus bar tank 2 in a direction orthogonal to the bus axis. Is also possible. According to such a configuration, displacement in all directions in the horizontal plane of the busbar tank 2 can be reduced.

As an embodiment corresponding to the sixth aspect of the present invention, as shown in FIG. 5, at least one end 17 of the damper 15 is slid into an elongated hole 16a provided at one end of the link 16. Movable, this link 1
It is also possible to adopt a configuration in which the other end of 6 is supported on the sliding portion 5 side or the base side. With this configuration, the damper 15 does not function because the end portion 17 of the damper 15 slides along the long hole 16a at the time of small displacement.
In the case of a large displacement exceeding the length a, the end 17 of the damper 15
Reaches the end of the long hole 16a, the damper 15 acts, and energy is absorbed. Therefore, the working range of the damper 15 can be limited.

In the lock mechanism 8 in the first embodiment, the case 11 can be provided on the pedestal portion 6 side, and the receiving base 12 can be provided on the sliding portion 5 side (for example, the beam portion 5b). is there. The shape for locking the protruding portion 10b of the pin 10 may be not a concave shape like the groove 12b but a raised convex shape.

Furthermore, it is possible to provide the guide 14 in the second embodiment on the sliding portion 5 side (for example, the beam portion 5b) and the rod 13 on the pedestal portion 6 side. And the bent part 13a of the rod 13 does not necessarily need to be formed.

[0033]

As described above, according to the present invention, it is possible to provide a gas insulated bus bar which can absorb the internal pressure of the insulating gas and the force due to thermal expansion and contraction and is excellent in earthquake resistance.

[Brief description of the drawings]

FIG. 1 shows a gas-insulated busbar according to a first embodiment of the present invention;
It is the block diagram seen from the generatrix axis direction.

FIG. 2 is a longitudinal sectional view showing a lock mechanism according to the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a displacement restricting means according to a second embodiment of the present invention.

FIG. 4 shows a gas-insulated bus according to a third embodiment of the present invention;
It is the block diagram seen from the generatrix axis direction.

FIG. 5 is a configuration diagram showing a damper 15 and a link 16 according to another embodiment of the present invention.

FIG. 6 shows a gas-insulated busbar according to a fourth embodiment of the present invention;
It is the block diagram seen from the generatrix axis direction.

FIG. 7 is a configuration diagram of an example of a conventional gas-insulated bus viewed from a direction perpendicular to a bus axis.

[Explanation of symbols]

 S ... Sliding leg 1 ... Gas insulated busbar 2 ... Bus bus tank 3,4 ... Support leg 5 ... Sliding portion 6 ... Pedestal portion 5a, 6a ... Sliding surface 5b ... Beam portion 6b ... Guide 7 ... Bellows with spring 8 ... Lock mechanism 9 Spring 10 Pin 10a Flange 10b Projection 11 Case 12 Cradle 12a Flat portion 12b Groove 13 Rod 13a Bending portion 14 Guide 15 Damper 16 Link 17 End

Claims (7)

[Claims] 1. A gas-insulated bus bar, in which a bus containing housings of conductors is continuously connected in a tank filled with an insulating gas and the tank is supported on a foundation by fixed legs and sliding legs, A gas-insulated bus bar, wherein displacement restraint means for restraining a relative displacement of a certain amount or more of the tank and the foundation is provided between the tank and the foundation. 2. The lock mechanism according to claim 1, wherein the displacement restricting means is a lock mechanism having an engaging portion that engages with each other when the tank moves in a direction perpendicular to the generatrix axis. The described gas insulated busbar. 3. The gas-insulated busbar according to claim 2, wherein at least one tank having a bent portion is provided, and said lock mechanism is disposed in said bent portion. 4. The displacement restricting means includes a guide fixed to a base side, and a rod having one end fixed to the tank side, wherein the guide has a groove in a generatrix axial direction. The gas-insulated busbar according to claim 1, wherein the other end of the rod is movably inserted along the groove, and the rod has elasticity. 5. The gas-insulated busbar according to claim 1, wherein said displacement restraining means is a damper vertically disposed between said tank side and said base side. 6. At least one end of the damper;
An elongated hole is formed in the fastening portion of the link so that the tank side or the foundation side is connected via a link, and the damper end fastened to the link is slidable. 6. The gas-insulated bus according to claim 5, wherein: 7. The gas-insulated bus bar according to claim 1, wherein the displacement restricting means is a contact portion that contacts the sliding leg from a direction perpendicular to a bus bar axis.