JP2000270416A - Bus connector for switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a bus connector in which the number of parts is decreased and the structure is simplified by passing one end of a main circuit connecting wire from an opening into an enclosure and connecting it with the main circuit conductor and sealing the opening at a position where the main circuit connecting wire is connected with the main circuit conductor with a sealing means provided on the main circuit connecting wire. SOLUTION: Forward end of the main circuit connecting wire 6 for interconnecting adjacent switchgear units is inserted into an enclosure 8 through an opening 8b made in the upper wall 8a of the enclosure 8. A slide contact 7a is fixed to the forward end of a conductor 6a in the main circuit connecting wire 6 and connected at a position where it is fitted to a contact 5a formed by bending the main circuit conductor 5. Furthermore, a flange 6c is formed on the outer circumference of the main circuit connecting wire 6 and the enclosure 8 is kept in enclosed state by sealing the opening 8b at the connecting position and interposing a packing 9 between the flange 6c and the opening 8b thus obtaining a switchgear having simple structure in which the number of parts is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power switchgear used for power distribution or power receiving equipment.

[0002]

2. Description of the Related Art FIGS. 8 and 9 are a front view and a sectional view taken along line AA of a conventional gas insulated switchgear disclosed in, for example, Nisshin Electric Technical Report Vol. Reference numeral 70 denotes a switchgear unit for each circuit, which is disposed adjacently and contains SF6 gas therein. Reference numeral 83 denotes an insulating bus for electrically connecting main circuits of the respective switchgear units. The details are shown below. In a conventional gas insulated switchgear, the pressure of the insulating gas in the switchgear unit was set higher than the atmospheric pressure. A bushing for connecting the main circuit that penetrates the sealed container is provided so that the construction can be performed while maintaining the sealed state in the sealed container.

FIG. 1 shows a specific configuration of a conventional main circuit connecting portion.
0 will be described. The insulating bus bar 83 is covered by engaging the conductor 83a, an insulator 83b covering the periphery of the conductor 83a, a covering portion 83c covering the periphery of the connecting portion, and an outer peripheral end of the covering portion 83c and tightening a bolt 85. And a mounting member 83d for pressing the portion 83c against the switchgear unit 70 side. A bushing 90 is attached to the opening and closing device unit 70 so as to penetrate the side of the closed container wall. The bushing 90 is a bushing conductor 9 having connection portions at both ends.
0a is provided at the center, and its outer periphery is covered with an insulator 90b. One end of the bushing conductor 90a is connected to a main circuit conductor 92 installed inside the switchgear unit 70, and the other end is provided with a ring-shaped sliding contact 84 in a connection hole of the bushing conductor 90a. Reference numeral 91 denotes an annular packing that seals the periphery of the through portion on the side of the closed container wall. At the connection position between the insulating bus bar 83 and the bushing 90, one end of the conductor 83a is inserted into the hole of the bushing conductor 90a and penetrates while contacting the inner peripheral surface of the sliding contact 84. In addition, the insulating portion of the outer peripheral portion is in a state in which the outer peripheral surface of the bushing 90 and the inner peripheral surface of the covering portion 83c are in close contact in a conical shape.

[0004]

As described above, in order to facilitate the work such as the addition and partial removal of the switchgear unit as described above, the conventional switchgear unit 7 is provided even during the work.
A bushing 90 for connection to the outside is required in order to maintain a sealed state of 0, and there is a problem that the number of parts is large and the structure is complicated.

The present invention has been made to solve the above-described problems, and a first object of the present invention is to provide a switchgear having a small number of parts and a simple configuration.

A second object of the present invention is to provide a simple switchgear having a structure for connecting the juxtaposed switchgear units.

A third object of the present invention is to provide a switchgear capable of facilitating a connection operation between juxtaposed switchgear units.

A fourth object of the present invention is to provide a simple switchgear having a structure with little decrease in insulation performance in connection work.

A fifth object is to obtain a switchgear having a reduced number of parts.

A sixth object is to provide an opening / closing device which is easy to handle during assembly.

[0011]

In an opening and closing device according to the present invention, an opening is provided in an upper wall of a closed container, and one end of a main circuit connecting wire penetrates through the opening of the closed container into the closed container to open the closed container. The main circuit conductor is connected to the main circuit conductor inside the main circuit connection line, and the opening is closed by a closing means provided on the main circuit connection line at a position where the main circuit connection line is connected to the main circuit conductor.

An opening is provided in the upper wall of the closed container of each of the adjacent switchgear units, and each end of the main circuit connection line penetrates through the opening of the closed container into the closed container to form a main circuit conductor in the closed container. So that the main circuit conductors in each closed container are connected to each other, and the opening is closed by a closing means provided in the main circuit connection line at a position where the main circuit connection line is connected to the main circuit conductor. It was done.

Further, the main circuit connection line is formed in a U-shape.

Further, the opening is opened upward, and the end of the main circuit connection line is penetrated into the closed container with the end directed downward, and is connected to the main circuit conductor.

Further, a flange formed on an outer peripheral portion of the main circuit connection line is used as closing means.

[0016] SF6 gas is used as an insulating fluid.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a single-line diagram showing the connection configuration of the switchgear of the present invention. In the figure, reference numeral 1 denotes a switchgear unit which is filled with SF6 gas and accommodates a main circuit for one circuit, and the switchgear units 1 for a required number of circuits are juxtaposed. Reference numeral 2 denotes a circuit breaker or a switch having a load current switching capability, and these are collectively called a switch. 3 is a disconnector / ground switch, 4 is a CT for measuring current, 5 is a main circuit conductor for connecting the circuit breaker 2 or the disconnector / ground switch 3, and 6 is a main circuit conductor of each switchgear unit 1. Reference numeral 7 denotes a main circuit connecting line connecting between the main circuit conductors 5, and reference numeral 7 denotes a connecting portion provided between the main circuit conductor 5 and the main circuit connecting line 6. In FIG. 1, a line extending downward through CT4 is a power supply line from a power company or a cable connected to the load side.

FIG. 2 is a front view showing a specific configuration of the switchgear shown in FIG. 1, and a partial cross-sectional view of an upper part of the switchgear. A main circuit conductor 5 is arranged above each switchgear unit 1, and a U-shaped main circuit connection line 6 is inserted from above each switchgear unit so as to straddle each switchgear unit 1. Are connected. Reference numeral 8a denotes an upper wall of the closed container 8, and an insulating gas (SF6 gas) is sealed in a portion below the upper wall. The main circuit connection line 6 is formed in a U-shape as described above, and a connection portion that can be connected in the insertion direction is provided at the end thereof. Since the opening time of the closed container 8b can be shortened,
The amount of invasion of the atmosphere into the interior can be reduced.

FIG. 3 shows a detailed structure of a connection portion of the main circuit connection line 6 in FIG. In the figure, the distal end of a main circuit connection line 6 that connects adjacent switchgear units 1 is inserted into the closed container 8 through an opening 8b provided in an upper wall 8a of the closed container 8. The main circuit connection line 6
A conductor 6a is placed at the center, and its periphery is covered with an insulator 6b. A sliding contact 7a having finger-like contacts urged inward by springs from both sides is attached to the tip of the conductor 6a, and the sliding contact 7a bends the main circuit conductor 5. The connection position is a position fitted to the contact portion 5a formed in this manner (ie, the state shown in FIG. 3). A flange 6c is formed integrally with the insulator 6b on the outer periphery of the main circuit connection line 6 so as to close the opening 8b at the connection position shown in FIG.
It is to be noted that the packing 9 is interposed between the flange 6c and the opening 8b so that the airtightness of the closed container 8 is maintained.
When the main circuit connection line 6 is not used, the closing plate 8c
Closes the opening 8b. In addition, as in the example of FIG.
By providing the sliding contact 7a on the side of the main circuit connection line 6, even if any failure occurs in the sliding contact 7a, it can be easily repaired outside the sealed container 8.

FIG. 4 is a cross-sectional view taken along the line CC of FIG. 3. The main circuit connection lines 6 are arranged in three phases in the depth direction. Further, the cross section of the conductor 6a is flat and the periphery thereof is formed with an insulating layer of a predetermined thickness to form an insulator 6b. The flange 6c is fastened to the upper wall 8a with a bolt 6c to seal the opening 8b.

FIG. 5 is a plan view showing the state of attachment of the main circuit connection line 6 for one phase as viewed in the direction of line DD in FIG. 3, in which a flange 6c is placed over the oval opening 8b. Bolt 1
It is concluded at 0.

In the switchgear according to the first embodiment, the inside of the closed vessel of the switchgear unit 1 shipped from the factory is filled with SF6 gas at atmospheric pressure or a pressure slightly higher than atmospheric pressure.
The opening 8b is shipped in a state of being closed by a closing plate 8c. At the installation site, the blocking plate 8c at the portion where the main circuit connection line 6 is to be inserted is removed, then the main circuit connection line 6 is inserted and connected from above the sealed container 8, and then the flange portion 6c is connected to the sealed container 8
And the operation is started again. SF6
Since the gas has a specific gravity greater than that of the atmosphere, even if the opening 8b is opened to the atmosphere during the connection work between the switchgear units 1 in a state where the SF6 gas is filled in the sealed container 8, the opening area of the opening 8b Is considerably smaller than the size of the closed container, and is directed to the upper part of the closed container 8 and upward, so that the amount of external air entering the closed container can be almost ignored, and the insulation performance decreases. Will not come.

In the above description, the SF6 gas used as the insulating medium has been described as having the atmospheric pressure or a pressure slightly higher than the atmospheric pressure. By further injecting SF6 gas into the closed vessel 8 by means not shown, it is possible to apply the present invention to a switchgear using an insulating medium exceeding atmospheric pressure.

In the above description, the U-shaped main circuit connection line 6 is inserted between the adjacent switchgear units 1 from above, but the insertion is limited to the U-shaped main circuit connection line 6. However, the present invention is not limited to those connecting adjacent switchgear units. For example, one end of a cable connected to the load side may be inserted and connected.

Embodiment 2 FIG. 6 shows an example in which the sliding contact 7a is mounted on the contact portion 5a side of the main circuit conductor 5 in the sealed container 8. With such a configuration, the opening 8b does not need to be large enough to pass through the sliding contact 7a, and only the main circuit connection line 6 needs to pass, so that the size of the opening 8b can be reduced. I can do it. In this way, the amount of air entering the closed container 8 during the connection operation can be reduced.

Embodiment 3 FIG. FIG. 7 shows an example in which the main circuit connection line 6 is used not in a U-shape but in an L-shape. In this case, it is necessary to penetrate and connect the side wall 11a of the adjacent airtight container 11, but if the penetrating portion is above the airtight container 11, the amount of the insulating medium leaking to the outside can be reduced, and the insulation performance deteriorates. There is almost nothing, and a simple connection structure can be obtained. Although a little time is required, it is possible to maintain reliable insulation performance by further injecting SF6 gas into the closed vessel 8 by means (not shown) after the main circuit connection line 6 is attached.

Embodiment 4 In the above-described first to third embodiments, examples in which SF6 gas is used as the insulating medium have been described. However, similar effects can be obtained as long as the specific gravity is higher than that of the atmosphere. In addition to the gaseous insulating medium, a liquid such as insulating oil may be used.

[0028]

According to the present invention, since it is configured as described above, the following effects can be obtained.

An opening is provided in the upper wall of the closed container, and one end of a main circuit connection line penetrates through the opening of the closed container into the closed container to be connected to a main circuit conductor in the closed container. Since the opening is closed by the closing means provided on the main circuit connection line at the position where the line is connected to the main circuit conductor, it is possible to obtain a switchgear having a small number of parts and a simple configuration.

Further, an opening is provided in the upper wall of the closed container of each of the adjacent switchgear units, and each end of the main circuit connection line penetrates through the opening of the closed container into the closed container to open the main circuit in the closed container. The main circuit conductors of the adjacent closed containers are connected to the conductors, and the openings are closed by closing means provided on the main circuit connection lines at positions where the main circuit connection lines are connected to the main circuit conductors. Therefore, it is possible to obtain a switchgear having a simple configuration capable of connecting between the juxtaposed switchgear units.

Further, since the main circuit connection line is formed in a U-shape, the connecting operation between the juxtaposed switchgear units can be easily performed, and a simple switchgear having a simple structure can be obtained.

Further, the opening is opened upward, and the end of the main circuit connection line is directed downward to penetrate into the sealed container and connect to the main circuit conductor. It is possible to obtain a simple opening / closing device having a configuration with little reduction.

Furthermore, since the flange formed on the outer periphery of the main circuit connection line is used as the closing means, a simple switchgear having a small number of components can be obtained.

Since SF6 gas was used for the insulating fluid,
It is possible to obtain a switchgear having good handleability at the time of assembly.

[Brief description of the drawings]

FIG. 1 is a single-line connection diagram of a switchgear according to Embodiment 1 of the present invention.

FIG. 2 is a front view and a partial cross-sectional view of the switchgear showing the first embodiment of the present invention.

FIG. 3 is a side sectional view of the switching device according to the first embodiment of the present invention, showing a connection state of main circuit connection lines of the switching device, as viewed from the front side of the device.

FIG. 4 is a sectional view taken along line CC of FIG. 3;

FIG. 5 is a partial plan view seen in the direction of line DD in FIG. 3;

FIG. 6 is a side cross-sectional view of the switching device according to Embodiment 2 of the present invention, showing a connection state of main circuit connection lines, as viewed from the front side of the device.

FIG. 7 is a side sectional view of a device showing a connection state of main circuit connection lines of a switchgear according to a third embodiment of the present invention, viewed from the front side of the device.

FIG. 8 is a front view showing a conventional switching device.

9 is a sectional view taken along line AA of FIG.

FIG. 10 is a sectional view taken along the line BB of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switchgear unit 2 Circuit breaker 3 Disconnector 5 Main circuit conductor 5a Connection part 6 Main circuit connection line 6a Conductor 6c Flange part 7 Connection part 7a Sliding contact 8 Sealed container 8a Upper wall 8b Opening

Claims (6)

[Claims] 1. A switchgear in which a switch, a disconnector, and a main circuit conductor connecting them are housed in a closed container and an insulating fluid having a specific gravity higher than that of the atmosphere is filled as an insulating medium. An opening is provided, one end of a main circuit connection line penetrates into the closed container from the open portion of the closed container to connect to the main circuit conductor in the closed container, and the main circuit connection line is connected to the main circuit. A bus connection device for a switchgear, wherein a closing means for closing the opening at a position connected to a conductor is provided in the main circuit connection line. 2. A plurality of switchgear having a switchgear, a disconnector constituting a unit circuit, and a main circuit conductor for connecting them in a closed container and enclosing an insulating fluid having a higher specific gravity than the atmosphere as an insulating medium. In what is juxtaposed,
An opening is provided in the upper wall of the closed container, and each end of the main circuit connection line penetrates into the closed container from the opening of the closed container and is connected to the main circuit conductor in the closed container to be adjacent to each other. The main circuit conductor of the closed container is connected, and a closing means for closing the opening at a position where each end of the main circuit connection line is connected to the main circuit conductor is provided on the main circuit connection line. Characteristic: A bus connection device for a switchgear. 3. A plurality of switchgear having a switchgear, a disconnector constituting a unit circuit, and a main circuit conductor for connecting them together in a closed container and enclosing an insulating fluid having a specific gravity higher than that of the atmosphere as an insulating medium. In what is juxtaposed,
An opening is provided in the upper wall of the closed container, and each end of a main circuit connecting line formed in a U-shape penetrates into the closed container from the opening of the closed container, and the main circuit conductor in the closed container is formed. And connecting the main circuit conductors of the adjacent closed containers to each other and closing the opening at a position where each end of the main circuit connection line is connected to the main circuit conductor. A bus connection device for a switchgear, wherein the bus is provided with a wire. 4. The main circuit conductor according to claim 1, wherein the opening is opened upward, and the end of the main circuit connection line penetrates downward into the closed container and is connected to the main circuit conductor. Item 4. A bus connection device for a switchgear according to Item 3. 5. The bus connecting device for a switchgear according to claim 1, wherein the closing means for closing the opening is a flange formed on an outer peripheral portion of the main circuit connecting wire. 6. The bus connection device for a switchgear according to claim 1, wherein the insulating fluid is SF6 gas.