JPH0974630A - Disconnectable bus device and method for disconnection thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disconnectable bus device which can be disconnected without making the size in the axial direction longer and without turning a connection conductor into an unstable state at the time of disconnection and damaging the inside. SOLUTION: A straight pressure balanced-type bellows 15 installed between two metallic tanks is constituted of one master bellows 16 and two slave bellows 17. Flanges are formed at both ends of each of the master bellows 16 and the slave bellows 17. The slave bellows 16 are serially connected on both sides of the master bellows 16. In the straight pressure balanced-type bellows 15, a short first connection conductor 18 and a longer second connection conductor 19 are connected with bolts 6 through a disconnection conductor 3 in the axial direction. Due to the difference in length between the connection conductors 18 and 19, the disconnection conductor 3 is located inside one slave bellows 17. Ends of the connection conductors 18, 19 are insulatedly supported by connecting sections 7 of insulation spacers 8 installed at both ends of the straight pressure balanced-type bellows 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a removable busbar device used for connecting busbars of a gas-insulated switchgear, and more particularly to
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detachable bus bar device and an attaching / detaching method for improving the detaching work.

[0002]

2. Description of the Related Art A gas insulated switchgear is constructed by accommodating main components such as a circuit breaker, a disconnector and a busbar in a metal tank filled with an insulating gas. For this reason,
Compared with other switchgear with high degree of exposure of each main equipment, it is possible to reduce required space, improve reliability and safety, and harmonize environment. As described above, since each main device in the gas insulated switchgear is housed in the metal tank, it is inconvenient for maintenance, inspection, installation, etc. unless the device can be divided into parts. For this reason, a general gas-insulated switchgear is configured to be separable by a detachable busbar device provided in the middle of the busbar in consideration of workability at the time of maintenance and inspection and installation.

An example of a detachable busbar device in such a gas insulated switchgear will be described below with reference to FIG. That is, the connection conductors 4 and 5 are connected to the inside of the metal tank 1 by the bolts 6 via the detachable conductor 3. The connecting conductors 4 and 5 are insulated and supported by the insulating spacer 8 and are connected to the front and rear (left and right in the drawing) connecting conductors via the central connecting portion 7 of the insulating spacer 8. The metal tank 1 is
It is connected to the front and rear metal tanks through a bellows 2, which is a bellows-shaped tube that can expand and contract. Further, the metal tank 1 is provided with a manhole 9 having a diameter capable of taking out the detachable conductor 3 and the connection conductors 4 and 5, and is closed by a lid 10.

The disassembling work of the example of the detachable bus bar apparatus as described above is performed as follows. That is, manhole 9
After removing the lid 10, the bolt 6 of the detachable conductor 3 is removed, and the detachable conductor 3 and the connecting conductors 4 and 5 are taken out from the manhole 9. Then, the metal tank 1 side of the bellows 2 is compressed and contracted to remove the metal tank 1 or the bellows 2, and the disassembly work is completed. In this case, since the gap between the metal tank 1 and the bellows 2 required for the attachment / detachment work only needs to be the extraction allowance, the expansion / contraction stroke required for the bellows 2 is the extraction allowance and the installation adjustment allowance. Therefore, the axial dimension L of the bellows 2 attached to the metallic tank can be made small, for example, 160 to 200 m.

By the way, in the gas-insulated switchgear,
Depending on the configuration of the equipment, absorption of thermal expansion and contraction, absorption of uneven settlement due to flying foundations, and absorption of axial displacement during an earthquake may be necessary. Bellows are also used to absorb such displacement, and one of them is a straight pipe pressure balancing type bellows. An example of a busbar of a gas insulated switchgear using such a straight pipe pressure balanced bellows will be described below with reference to FIG. That is, the straight pipe pressure balanced bellows 11 is
It is configured by two child bellows 13 connected in series at both ends with one parent bellows 12 at the center. The ratio of the inner diameters of the parent bellows 12 and the child bellows 13 is set to 1: [square root of 2], and the gas pressure generated by this ratio can be compensated. The straight pipe pressure-balanced bellows 11 described above can compensate the gas pressure, and therefore has the advantage that the load applied to the foundation is reduced and the foundation can be simplified.

[0006]

However, the detachable busbar device using the straight pipe pressure balancing type bellows as described above has the following problems. That is, in the above straight pipe pressure balancing type bellows, all three bellows, which are the parent bellows 12 and the small bellows 13, are connected in series. It will be 3 times the case. Furthermore, considering the stroke life for thermal expansion / contraction absorption, unequal settlement absorption, and axial displacement absorption during an earthquake, each bellows should be 2 to 3 times.
It is necessary to double the length, and it becomes 6 to 9 times longer as a whole.

When the axial dimension of the bellows is increased in this way, the axial dimension of the conductor 14 disposed inside is also increased, and the conductor 14 cannot be taken out of the bellows even at the compression limit dimension of the bellows. Become. Therefore, the disassembling work in such a case involves attaching and detaching the conductor 14 while leaving the conductor 14 left inside the bellows. However, when the work for removing the bellows is being performed, the conductor 14 is not fixed and is in an unstable state. Therefore, it may fall from the bellows. Even if the conductor 14 does not fall, the conductor 14 may move around in the bellows at the time of attachment / detachment, and the inside of the bellows may be damaged. In order to prevent such a drop of the conductor 14, when an operator enters inside, the bellows may be damaged because the bellows are thin and the bellows may be deformed. For this reason, when it is necessary to attach and detach on this shaft, a detachable bus bar device similar to that shown in FIG. 8 must be further provided, and the axial dimension of the gas insulated switchgear becomes unnecessarily long, and the size and size are reduced. Is disadvantageous to conversion.

The present invention was proposed in order to solve the problems of the prior art as described above, and its main purpose is to easily attach / detach without increasing the axial dimension, and at the time of attaching / detaching, a connecting conductor. It is an object of the present invention to provide a removable busbar device that does not become unstable and does not damage the inside.

Another object of the present invention is to provide a method for attaching / detaching a detachable bus bar device, in which the connecting conductor does not become unstable at the time of detaching / attaching and can be easily detached from the bus bar without damaging the inside.

[0010]

In order to achieve the above object, the invention according to claim 1 provides a straight pipe pressure balanced bellows in which a plurality of expandable bellows are connected in series to a busbar of a gas insulated switchgear. In a detachable busbar device in which a connecting conductor for communication is accommodated and both ends of the straight pipe pressure-balanced bellows are detachably connected to a metal tank for a busbar of a gas-insulated switchgear, the connecting conductor is a first The first end of the straight pipe pressure-balanced bellows, which is composed of a connection conductor and a second connection conductor longer than the connection conductor, is removed from the metal tank and compressed to remove the first end.
The first connecting conductor and the second connecting conductor are detachably connected by a detachable conductor 3 at a position where the connecting conductor is exposed to the extent that it can be taken out.

In the above-mentioned invention of claim 1, the connecting conductor in the straight pipe pressure balancing type bellows is constituted by the first connecting conductor and the second connecting conductor which are detachably connected by the detachable conductor. Has been done. Therefore, one end of the bellows can be detached from the metal container, the bellows can be compressed to an extent that the first connecting conductor and the detachable conductor can be taken out, an opening can be provided, and the detachable conductor can be detached from the second connecting conductor through this opening. . Therefore, the straight pipe pressure balancing bellows can be removed from the busbar together with the second connecting conductor without separately providing a detachable busbar device.

According to a second aspect of the present invention, there is provided a straight pipe pressure balancing type bellows in which a plurality of expandable bellows are connected in series.
A connection conductor for connecting the busbar of the gas insulated switchgear is housed,
In a detachable busbar device in which both ends of the straight pipe pressure balancing type bellows are detachably connected to a metal tank for a busbar of a gas insulated switchgear, the connecting conductor includes a first connecting conductor and a second connecting conductor longer than the first connecting conductor. The first connection conductor and the second connection conductor are detachably connected by a detachable conductor, and one end of the straight pipe pressure balance type bellows is connected to the first connection conductor and It is connected to the metal tank via a connection tank containing the detachable conductor 1, and a manhole having a diameter that allows the first connection conductor and the detachable conductor to be taken out is formed on a side surface of the connection tank. It is characterized by

In the invention according to claim 2 as described above, since the first connecting conductor and the detachable conductor are in the connecting tank,
After taking out the first connecting conductor and the detachable conductor from the manhole to the outside, the straight pipe pressure balanced bellows can be removed from the busbar together with the second connecting conductor. Therefore, the compression distance of the bellows is the minimum necessary for removal from the bus bar, and the axial dimension of the bellows can be shortened.

According to a third aspect of the present invention, in the detachable bus device according to the first or second aspect, the periphery of the detachable conductor is covered with a magnetic material.

According to the invention described in claim 3, the energy of the high frequency surge generated in the gas insulated switchgear can be absorbed by the magnetic material.

According to a fourth aspect of the present invention, there is provided a straight pipe pressure balancing type bellows comprising a plurality of expandable bellows connected in series.
A connection conductor for connecting the busbar of the gas insulated switchgear is housed,
In the attaching / detaching method of the attaching / detaching busbar device in which both ends of the straight pipe pressure balancing type bellows are detachably connected to a metal tank for a busbar of a gas insulated switchgear, the connecting conductor is attached / detached. , A first connecting conductor and a second connecting conductor longer than the first connecting conductor, the first connecting conductor and the second connecting conductor are detachably connected by a detachable conductor, and the straight pipe pressure balance is provided. The end of the type bellows on the side of the first connecting conductor is removed from the metal tank, the detachable conductor is removed from the second connecting conductor, and the second connecting conductor is attached to the straight pipe pressure balancing type bellows. And then fixed by a supporting member, the straight pipe pressure balancing type bellows is removed from the bus bar integrally with the second connecting conductor.

According to the fourth aspect of the invention, when the straight pipe pressure balancing type bellows is removed from the bus bar, the straight pipe pressure balancing type bellows and the second connecting conductor are integrated by the supporting member. Therefore, when the straight pipe pressure balancing type bellows is removed from the bus bar, the second connecting conductor does not become unstable and the inside is not damaged.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a removable bus bar device according to the present invention will be described below with reference to the drawings. The supporting member described in claim 4 is a supporting plate, and the same members as those of the conventional technique shown in FIGS. 8 and 9 are denoted by the same reference numerals and the description thereof will be omitted.

(1) First Embodiment One embodiment corresponding to the invention described in claims 1 and 4 will be described as a first embodiment with reference to FIGS.

(Structure) First, the structure of an embodiment of a detachable bus bar device corresponding to the invention of claim 1 will be described. That is, as shown in FIG. 1, the straight pipe pressure balancing type bellows 15
Is composed of one parent bellows 16 and two child bellows 17. 16 parent bellows and 1 child bellows
A flange 23 is provided at each end of each of the seven bellows 7, and a child bellows 17 is connected to both sides of the parent bellows 16 in series.

A short first connecting conductor 18 and a second connecting conductor 19 longer than this are connected by bolts 6 via a detachable conductor 3 in the axial direction inside the straight pipe pressure balancing type bellows 15. There is. Due to the difference in the lengths of these connecting conductors 18 and 19, the detachable conductor 3 is located inside one (left side in the drawing) child bellows 17. And both connection conductors 18,
The ends of 19 are insulated and supported by the connecting portions 7 of the insulating spacers 8 provided at both ends of the straight pipe pressure balancing type bellows 15.

(Operation) The operation of the detachable bus bar device having the above construction will be described below in accordance with the procedure of the detaching method corresponding to the invention of claim 4. First, as shown in FIG. 2, the straight pipe pressure balancing type bellows 15 is compressed from one child bellows 17 side (left side in the figure) to provide an opening. During this work, parent bellows 16 and child bellows 17
It is necessary to work so as not to exceed the compression limit of.

Next, as shown in FIGS. 3 and 4, the bolt 6
To remove the detachable conductor 3 from the first and second connection conductors 18, 1
After removing from 9, the support plate 20 extending in the radial direction of the child bellows 17 is inserted, and both ends of the support plate 20 are fixed to the flange 23 of one child bellows 17 with bolts and nuts 22. A hole for attaching the second connecting conductor 19 is provided in the center of the supporting plate 20, and the second connecting conductor 19 is fixed to the supporting plate 20 by inserting a bolt 21 into the hole.

In this state, when the straight pipe pressure balancing bellows 15 is further separated from the connection tank 24, the straight pipe pressure balancing bellows 15 and the second connecting conductor 19 are separated by the support plate 20 as shown in FIG. It is removed as a unit. This removal work is done manually, by crane,
Use heavy equipment such as tow truck or equipment such as chain block. The assembling work can be performed in the reverse order of the above procedure.

(Effect) The effects of the present embodiment as described above are as follows. That is, when the straight pipe pressure balancing type bellows 15 is attached to or detached from the connection tank 24, the second connection conductor 19 is fixed to the support plate 20. Therefore, at the time of attachment / detachment, the second connecting conductor 19 is stable, and the straight pipe pressure balancing type bellows 15 is not damaged. Since the first connecting conductor 18 is shorter than the second connecting conductor 19,
There is no risk of falling and it can be easily removed.

Further, the compression length of the straight pipe pressure balancing type bellows 15 at the time of attachment / detachment may be substantially the length of the detachable conductor 3 in the axial direction since the detachable conductor 3 may be detachable.
Therefore, it is not necessary to lengthen the straight pipe pressure balancing type bellows 15 in the axial direction in order to lengthen the compression length. Further, it is not necessary to separately provide a detachable bus bar device for detaching the long second connecting conductor 19. Therefore, it is advantageous for downsizing and downsizing of the gas insulated switchgear.

(2) Second Embodiment One embodiment corresponding to the invention described in claims 2 and 4 will be described as a second embodiment with reference to FIGS. 6 and 7. . The same members as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

(Structure) First, the structure of an embodiment of a detachable bus bar apparatus corresponding to the invention of claim 1 will be described. That is, as shown in FIG. 6, the straight pipe pressure balancing type bellows 15
A connection tank 24 is connected between the one child bellows 17 and the corresponding insulating spacer 8. A manhole 27 is formed on the side surface of the connection tank 24, and the manhole 27 is provided so as to be sealed by a lid 28.

Inside the straight pipe pressure balancing type bellows 15,
A long second connecting conductor 26, one end of which is insulated and supported by the connecting portion 7 of the insulating spacer 8, is provided. The other end of the second connection conductor 26 is fixed to one end of the detachable conductor 3 inside the connection tank 24 with a bolt 6. One end of the first connecting conductor 25 is fixed to the other end of the detachable conductor 3 with a bolt 6. The other end of the first connecting conductor 25 is insulated and supported by the connecting portion 7 of the insulating spacer 8. The manhole 17 includes the first connecting conductor 25 and the detachable conductor 6.
Has a diameter that can be taken out.

(Operation) The operation of the detachable bus bar apparatus having the above construction will be described below in accordance with the procedure of the detaching method corresponding to the invention of claim 4. First, as shown in FIG. 7, the straight pipe pressure balancing type bellows 15 is compressed from the one child bellows 17 side (the left side in the figure) by the minimum size capable of removing the tank 24 to provide an opening. Next, after removing the bolts 6 and the detachable conductors 3, the support plates 20 are inserted, and both ends of the support plates 10 are attached to the bolts and nuts 2.
It is fixed to the flange 23 of one child bellows 17 at 2. Then, the second connection conductor 26 is fixed to the support plate 20 by passing the bolt 21 through the hole in the central portion of the support plate 20.

Further, after removing the lid 28 of the manhole 27 and removing the bolt 6 from the detachable conductor 3, the detachable conductor 3 and the first conductor 3 are removed.
The connection conductor 25 of is taken out from the manhole 27. At this time, an operator can enter the inside of the connection tank 24 to work.

In this state, the connection tank 24 is detached and removed, a space for the detachment is secured, and then the straight pipe pressure balancing type bellows 15 is removed together with the second connection conductor 26. The assembling work can be performed in the reverse order of the above procedure.

(Effect) The effects of the present embodiment as described above are as follows. That is, as in the first embodiment, since the second connecting conductor 19 is fixed to the support plate 20 during attachment / detachment, damage to the bellows is prevented. And
The detachable conductor 3 and the first connection conductor 18 are connected to the manhole 27.
Can be easily removed from. Detachable conductor 3 and first
Since the accommodating place of the connection conductor 25 is in the metal tank 24, there is no problem in strength even if an operator enters the connection tank 24 to work.

Further, the compression length of the straight pipe pressure balancing type bellows 15 at the time of attachment / detachment may be the minimum dimension that allows the tank 24 to be removed, and therefore, it may be shorter than that of the first embodiment. . Therefore, it is not necessary to lengthen the straight pipe pressure balancing bellows 15 in the axial direction in order to lengthen the compression length,
It will be even more advantageous due to the miniaturization and downsizing of the gas insulated switchgear.

(3) Other Embodiments The present invention is not limited to the above embodiments, and the size, material, etc. of each member can be changed as appropriate.
For example, as an embodiment corresponding to the invention described in claim 3, when the periphery of the detachable conductor 3 is covered with a magnetic material such as amorphous metal, the energy of the high frequency surge generated in the gas insulated switchgear is magnetized. Can be absorbed by the material. Therefore, with such a configuration, it is possible to prevent an overvoltage from being generated due to a surge, it is less likely to cause a dielectric breakdown accident, and reliability is improved.

[0036]

As described above, according to the present invention, it is possible to easily attach / detach without increasing the axial dimension, to prevent the connection conductor from becoming unstable during attachment / detachment, and to provide a detachable busbar device without damaging the inside. can do.

Further, according to the present invention, it is possible to provide an attaching / detaching method of an attaching / detaching busbar device in which the connecting conductor does not become unstable at the time of attachment / detachment and can be easily attached / detached from the busbar without damaging the inside.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a removable bus bar device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a compressed state of a bellows in a disassembling process of the detachable bus bar apparatus of FIG.

FIG. 3 is a cross-sectional view showing a mounting state of a support plate in the disassembling process of the detachable bus bar apparatus of FIG.

4 is a view of the detachable bus bar apparatus of FIG. 3 taken along the line XX.

5 is a cross-sectional view showing a detached state of the straight pipe pressure balanced bellows in the disassembling process of the detachable bus bar apparatus of FIG. 1. FIG.

FIG. 6 is a cross-sectional view showing a removable bus bar device according to a second embodiment of the present invention.

7 is a cross-sectional view showing an exploded process of the removable bus bar device of FIG.

FIG. 8 is a cross-sectional view showing an example of a removable bus bar device using a conventional bellows.

FIG. 9 is a cross-sectional view showing an example of a gas-insulated bus bar using a conventional straight pipe pressure balanced bellows.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Metal tank 2 ... Bellows 3 ... Detachable conductor 4, 5 ... Connection conductor 6 ... Bolt 7 ... Connection part 8 ... Insulation spacer 9 ... Manhole 10 ... Lid 11, 15 ... Straight pipe pressure balance type bellows 12, 16 ... Parent Bellows 13, 17 ... Child bellows 14 ... Conductor 18, 25 ... First connection conductor 19, 26 ... Second connection conductor 20 ... Support plate 21 ... Bolt 22 ... Bolt / nut 23 ... Flange 24 ... Connection tank

Claims (4)

[Claims] 1. A straight pipe pressure balancing type bellows in which a plurality of expandable bellows are connected in series accommodates a connecting conductor for connecting a bus of a gas insulated switchgear, and both ends of the straight pipe pressure balancing type bellows are gas. In a detachable busbar device detachably connected to a metal tank for a busbar of an insulated switchgear, the connecting conductor includes a first connecting conductor and a second connecting conductor longer than the first connecting conductor.
Of the straight pipe pressure balancing type bellows, the first connection conductor can be taken out when the first connection conductor side end of the straight pipe pressure balancing type bellows is removed from the metal tank and compressed. A detachable bus bar device, wherein the first connecting conductor and the second connecting conductor are detachably connected by a detachable conductor 3 at an exposed position. 2. A straight pipe pressure balancing type bellows, in which a plurality of expandable bellows are connected in series, accommodates a connecting conductor for connecting a busbar of a gas insulated switchgear, and both ends of the straight pipe pressure balancing type bellows are gas. In a detachable busbar device detachably connected to a metal tank for a busbar of an insulated switchgear, the connecting conductor includes a first connecting conductor and a second connecting conductor longer than the first connecting conductor.
The first connection conductor and the second connection conductor are detachably connected by a detachable conductor, and one end of the straight pipe pressure balance type bellows includes the first connection conductor and the first connection conductor. It is connected to the metal tank via a connection tank containing the detachable conductor 1, and a manhole having a diameter that allows the first connection conductor and the detachable conductor to be taken out is formed on a side surface of the connection tank. A detachable bus bar device characterized by the above. 3. The method according to claim 1 or 2, wherein the detachable conductor is surrounded by a magnetic material.
Detachable busbar device described. 4. A straight pipe pressure balancing type bellows, in which a plurality of expandable bellows are connected in series, accommodates a connecting conductor for connecting a busbar of a gas insulated switchgear, and both ends of the straight pipe pressure balancing type bellows are gas. In a method of attaching and detaching a detachable busbar device detachably attached to a busbar metal tank of an insulating switchgear, the connecting conductor being longer than the first connecting conductor. Second
The first connection conductor and the second connection conductor are detachably connected by a detachable conductor, and the first pipe side end of the straight pipe pressure balanced bellows is After removing from the metal tank, removing the detachable conductor from the second connecting conductor, and fixing the second connecting conductor to the straight pipe pressure balancing type bellows by a supporting member, the straight pipe pressure balancing A detachable busbar device attaching / detaching method, wherein the mold bellows is detached from the busbar integrally with the second connecting conductor.