HK1134379B - Switchgear - Google Patents

Description

Switch mechanism

Technical Field

The present invention relates to a switchgear, and more particularly, to a switchgear suitable for arranging a plurality of (hereinafter, referred to as column trays) vacuum insulated switchgears in parallel to an already-installed gas insulated switchgear.

Background

A power receiving and distributing apparatus is provided with a switching mechanism that houses a circuit breaker for breaking a load current or an accident current, a circuit breaker and a ground switch for securing safety of an operator when performing maintenance and inspection of a load, a detection device of a system voltage or current, a protective relay, and the like.

The switch mechanism has various insulation modes, and there are not only a gas insulation disk used in the past but also SF used as an insulation gas₆Gas Insulated Switchgear (GIS) of gas combination type, solid insulation, compressed air insulation, and full vacuum insulation have been developed from the viewpoint of environmental compatibilityA switch mechanism of the mode.

In the process of accelerating miniaturization of each component of the circuit breaker, the disconnector and the grounding switch by using the various insulation methods, a vacuum insulated switchgear in which a vacuum double-break three-position type switching section having a breaking and interrupting function and vacuum insulation and a grounding switch having the same vacuum insulation are integrated by epoxy molding has been proposed (for example, see patent document 1: japanese patent application laid-open No. 2006-238522).

In the vacuum insulated switchgear, the vacuum vessel accommodating the vacuum double-break three-position type switch unit having the breaking and interrupting functions and the vacuum vessel accommodating the switch unit having the grounding function are integrated by epoxy casting molding and accommodated in the cabinet, so that the vacuum insulated switchgear is small in size, light in weight, and highly reliable.

In recent years, power receiving and transforming apparatuses have been required to have various user demands. For example, in a demand place, since the types and operation conditions of loads vary depending on the purpose of use, a power distribution system is planned in consideration of safety, reliability, operation and maintenance required by a user and future load increase, and in this power distribution plan, it is necessary to consider control of a circuit breaker, a grounding switch, and the like constituting a power receiving and distributing equipment, and monitoring and measurement of voltage, current, and the like.

In this case, it is important to reduce the installation space of each of the above-described devices and devices for controlling, monitoring, and measuring the devices, and to suppress the investment for installation. The vacuum insulated switchgear can flexibly meet various demands of users, and is compact, lightweight, and highly reliable.

On the other hand, users demand new installation of various switchgear in power distribution plans. Add, move, etc. In particular, when a new switchgear is provided, it is economically impossible to newly provide all switchgear in a substation at once, and therefore, in some cases, only a few new switchgear are provided, and in this case, or in cases where an additional switchgear is included, it is conceivable to use the already-provided gas-insulated switchgear and the above-described vacuum-insulated switchgear in combination. That is, in recent years, with the development of a vacuum insulated switchgear that utilizes high insulation performance in vacuum and can be made smaller than a gas insulated switchgear, it has been considered to introduce a vacuum insulated switchgear instead of an existing gas insulated switchgear.

Here, the vacuum insulated switchgear is a structure in which the switchgear units such as vacuum interrupters accommodated in a plurality of disks are electrically connected to each other by solid insulated bus bars, and the gas insulated switchgear is a structure in which the switchgear units such as vacuum interrupters accommodated in each disk are electrically connected to each other by gas insulated bus bars.

However, when the switching mechanism is provided, a plurality of switching mechanisms are often arranged in a row of disks as compared with the case where only one switching mechanism is provided, and it takes much cost to replace all the gas-insulated switching mechanisms of the row of disks with vacuum-insulated switching mechanisms, which is an obstacle to the introduction of the vacuum-insulated switching mechanisms.

In addition, in the case of the panel gas insulated switchgear and the vacuum insulated switchgear, the gas insulated switchgear is configured such that the connection bus is a bare conductor that is gas insulated and the insulation distance between the connection buses needs to be increased, whereas the vacuum insulated switchgear is configured such that the connection bus is a solid insulated conductor and the insulation distance between the connection buses does not need to be increased.

In this way, since the insulation distances between the gas and vacuum bus bars are different, it is difficult to connect the bus bars in the two switching mechanisms without adjusting the insulation distance between the bus bars, in other words, it is difficult to form a structure for arranging the gas insulated switching mechanism and the vacuum insulated switching mechanism.

Disclosure of Invention

The present invention has been made in view of the above problems, and a first object of the present invention is to provide a switchgear in which the insulation distance between bus bars is easily adjusted even when the insulation distance between the bus bars is different, and the column tray structure of a gas insulated switchgear and a vacuum insulated switchgear can be formed.

It is a second object of the present invention to provide a switchgear that can realize a column plate structure of a gas insulated switchgear and a vacuum insulated switchgear without increasing the installation area.

In order to achieve the first object, the switch mechanism of the present invention is characterized in that: a plurality of vacuum insulated switchgear and gas insulated switchgear are arranged side by side and adjacently arranged, the vacuum insulated switchgear has a switch unit having at least a breaking and interrupting function and housed in each of the disks, and a solid insulated bus electrically connecting the switch units in each of the disks, the gas insulated switchgear has a switch unit having at least a breaking and interrupting function and housed in each of the disks, and a gas insulated bus electrically connecting the switch units in each of the disks, and the vacuum insulated switchgear and the gas insulated switchgear are electrically connected to each other by connecting the solid insulated bus to the gas insulated bus by a flexible conductor.

In order to achieve the second object, a switching mechanism according to the present invention is characterized in that: a plurality of vacuum insulated switchgear and gas insulated switchgear are arranged side by side and adjacently arranged, the vacuum insulated switchgear has a switch unit having at least a breaking and interrupting function and housed in each disk, and a solid insulated bus electrically connecting the switch units in each disk, the gas insulated switchgear has a switch unit having at least a breaking and interrupting function and housed in each disk, and a gas insulated bus electrically connecting the switch units in each disk, the vacuum insulated switchgear and the gas insulated switchgear are electrically connected by a conductor connecting the solid insulated bus and the gas insulated bus, the length direction of the disk of the vacuum insulated switchgear is formed to be shorter than the length direction of the disk of the gas insulated switchgear, and a cabinet is arranged in a space portion generated when the vacuum insulated switchgear and the gas insulated switchgear are arranged side by side, the connection part between the conductor and the solid insulated bus and the gas insulated bus is disposed in the housing.

The present invention has the following effects.

According to the switchgear of the present invention, even if the insulation distances between the buses are different, the insulation distance between the buses can be easily adjusted by connecting the flexible conductors of the solid insulated bus and the gas insulated bus, so that the column tray structure of the gas insulated switchgear and the vacuum insulated switchgear can be realized, and the introduction of the vacuum insulated switchgear can be facilitated.

Further, since the dimension in the disk longitudinal direction of the vacuum insulated switchgear is set to be shorter than the dimension in the disk longitudinal direction of the gas insulated switchgear, and the cabinet is disposed in a space portion generated when the vacuum insulated switchgear and the gas insulated switchgear are arranged in parallel, and the connection portions between the conductor and the solid insulated bus bar and the gas insulated bus bar are disposed in the cabinet, it is not necessary to provide a special space for connecting the vacuum insulated switchgear and the gas insulated switchgear, that is, it is not necessary to increase the installation area, and the disk array structure can be realized.

Drawings

Fig. 1 is a perspective view showing the column plate structure of a gas insulated switchgear and a vacuum insulated switchgear in a first embodiment of the switchgear of the present invention.

Fig. 2 is a perspective view showing a state in which the first embodiment of the switch mechanism of the present invention is viewed from a different angle from fig. 1.

Fig. 3 is a perspective view showing an example of arrangement of a connecting device in a gas-insulated switchgear according to a first embodiment of the switchgear of the present invention.

Fig. 4 is a perspective view, partially in section, showing an example of arrangement of connecting devices in the vacuum insulated switchgear and in the rack according to the first embodiment of the switchgear of the present invention.

Fig. 5 is a partial perspective view showing a connecting device used in the first embodiment of the switch mechanism of the present invention.

Fig. 6 is a perspective view showing the connecting device shown in fig. 5 viewed from a different angle.

Fig. 7 is a partial perspective view showing a connecting device used in a second embodiment of the switch mechanism of the present invention.

Fig. 8 is a perspective view showing the column plate structure of the gas insulated switchgear and the vacuum insulated switchgear in the second embodiment of the switchgear of the present invention.

In the figure:

1. 51-gas insulation switch mechanism, 2-vacuum insulation switch mechanism, 4-cabinet, 11-first solid insulation bus, 12-second solid insulation bus, 13, 14, 15, 16-solid insulation connecting part, 17, 67-solid insulation cable, 19-insulator, 20-fixing rack, 21, 71-gas insulation end, 22, 72-connecting conductor.

Detailed Description

To provide a switchgear capable of easily adjusting the insulation distance between buses even when the insulation distance between the buses is different and realizing the column plate structure of a gas insulated switchgear and a vacuum insulated switchgear, and to provide the switchgear capable of realizing the above object with a simple structure.

Example 1

Hereinafter, a first embodiment of a switch mechanism according to the present invention will be described with reference to fig. 1 to 6.

Fig. 1 and 2 are perspective views showing the overall structure of an already installed gas-insulated switchgear 1 in which a vacuum-insulated switchgear 2 is wound in a row, viewed from different angles.

As shown in the drawing, reference numeral 1 denotes a gas-insulated switchgear 1, in which a switchgear unit (for example, a vacuum interrupter) having a breaking and interrupting function is housed in a gas inside a disk, and the switchgear units such as the vacuum interrupter, which are not shown but are housed in the respective disks, are electrically connected to each other by a bus bar insulated with gas. On the other hand, reference numeral 2 denotes a vacuum insulated switchgear 2, in which a vacuum vessel containing a vacuum double-break three-position type switch unit as shown in fig. 5 of patent document 1 and a vacuum vessel containing a ground switch unit are integrated by epoxy molding and contained in a housing, and switch units such as vacuum interrupters contained in a plurality of disks are electrically connected to each other by solid insulated bus bars. The two are arranged side by side and adjacent to each other, and are electrically connected by a connecting means to form a column tray structure.

In the present embodiment, the dimension in the disk longitudinal direction (L direction in fig. 1 and 2) of the vacuum insulated switchgear 2 is formed to be shorter than the dimension in the disk longitudinal direction of the gas insulated switchgear 1, and when these two are arranged side by side in the adjacent manner, a space is created in the disk longitudinal direction of the vacuum insulated switchgear 2 due to the short dimension in the disk longitudinal direction, the cabinet 4 is arranged in this space portion, and the above-described connection device is accommodated in the cabinet 4.

As will be described in detail later, the above-described connecting device generally includes: a first solid insulation bus connected to a vacuum interrupter of the vacuum insulation switching mechanism 2 and connected to a connection bus led out from an upper portion of the vacuum container; the second solid insulated bus is connected with the first solid insulated bus, and one part of the second solid insulated bus passes through the case 4; and a flexible third solid-state insulated bus connected to the second solid-state insulated bus passing through the inside of the enclosure 4 and connected to the connection bus from the gas-insulated switchgear 1.

The above-described connection device will be described in detail with reference to fig. 5 and 6. In the figure, reference numeral 11 denotes a first solid insulated bus bar of three phases of solid insulation, one end of which is connected to a vacuum interrupter of the vacuum insulated switchgear 2, and which is drawn out vertically from above the vacuum vessel and extends horizontally integrally with a solid insulated connector 13 as the other end, and the side of the first solid insulated bus bar 11 opposite to the solid insulated connector 13 side is connected to another vacuum insulated switchgear, not shown, for example. The first solid-insulated bus bar 11 is rotatable in a horizontal plane about the inner conductor of the solid-insulated connecting portion 13.

On the other hand, the second solid insulated bus bar 12 having solid insulation extends in a horizontal direction (a direction intersecting the first solid insulated bus bar 11) perpendicular to a vertical direction of the solid insulated connection portion 13 integral with the first solid insulated bus bar 11, and a solid insulated connection portion 14 arranged in a direction perpendicular to the extending direction of the second solid insulated bus bar 12 and integral with the second solid insulated bus bar 12 is provided above the solid connection insulation portion 13 which is one end of the second solid insulated bus bar 12, and the second solid insulated bus bar 12 is rotatable in a horizontal plane about an inner conductor of the connection portion together with the solid insulated connection portion 14.

In this way, the first solid-insulated bus bar 11 and the second solid-insulated bus bar 12 are connected so as to be rotatable in the horizontal plane together with the solid-insulated connectors 13 and 14, the solid-insulated connector 15 arranged in the direction perpendicular to the extending direction of the second solid-insulated bus bar 12 is integrally provided at the end of the second solid-insulated bus bar 12 opposite to the side where the solid-insulated connector 14 is provided, and the solid-insulated connector 16 is arranged above the solid-insulated connector 15. The solid insulation connecting portion 16 is formed integrally with a solid insulation cable 17 as a third solid insulation bus bar extending in the horizontal direction, which is solid insulated. The solid insulated cable 17 is configured by making the inner conductor, for example, a twisted copper wire to be flexible, covering the periphery thereof with an insulating rubber such as silicone rubber, and covering the periphery of the insulating rubber with a conductive rubber of a ground potential.

The solid-insulated connecting portion 15 and the second solid-insulated bus bar 12, and the solid-insulated connecting portion 16 and the solid-insulated cable 17 are rotatable about the inner conductor of the connecting portion, and the second solid-insulated bus bar 12 and the solid-insulated cable 17 are rotatable in the horizontal plane together with the solid-insulated connecting portion 15 and the solid-insulated connecting portion 16. The lower portion of the solid insulating connecting portion 15 is connected to an insulator 19, and the insulator 19 is fixed to a fixing frame 20 supported by the lower portion in the housing 4.

On the other hand, the end of the solid insulated cable 17 opposite to the side where the solid insulated connecting portion 16 is provided is connected to the gas insulated terminal 21, the gas insulated terminal 21 has a corrugated structure made of an insulator on the outer periphery of the inner conductor, and the necessary insulation distance in the gas is secured between the three-phase gas insulated terminals 21. The gas insulated terminal 21 is connected to an inner bare bus conductor by a connecting conductor 22 in the gas insulated switchgear 1.

The first solid-state insulated bus bar 11, the second solid-state insulated bus bar 12, the solid-state insulated connectors 13, 14, 15, and 16, and the solid-state insulated cable 17 are each covered with an insulating rubber such as silicone rubber, and the surrounding is covered with a conductive rubber having a ground potential to provide solid insulation. On the other hand, the periphery of the gas-insulated terminal 21 is not at the ground potential, but at an intermediate potential.

The positions where the respective parts of the above-described connection device are arranged when the gas-insulated switchgear 1 and the vacuum-insulated switchgear 2 are arranged are described with reference to fig. 3 and 4.

As shown in the drawing, the first solid insulated bus bar 11 is disposed from a solid insulated connection portion 13 extending above the vacuum vessel of the vacuum insulated switchgear 2 to a region outside the disk of the vacuum insulated switchgear 2, and is connected to another adjacent vacuum insulated switchgear, for example. On the other hand, the second solid insulated bus bar 12 is arranged from the inside of the vacuum insulated switchgear 2 to the inside of the locally large enclosure 4, and is supported by the fixing frame 20 in the enclosure 4. The solid insulated cable 17 is arranged from the inside of the cabinet 4 to the inside of the gas insulated switchgear 1, and the gas insulated terminal 21 connected to the end of the solid insulated cable 17 is connected to a bare bus conductor in the gas insulated switchgear 1 via a connecting conductor 22.

In fig. 4, reference numeral 30 denotes a cable, reference numeral 31 denotes a holder of the cable 30, reference numeral 32 denotes a current transformer for measurement, and reference numeral 33 denotes a current transformer for protection, and these components are all disposed in the vacuum insulated switchgear 2.

In this way, in the present embodiment, by forming the vacuum insulated switchgear 2 on the already-installed gas insulated switchgear 1 array panel using the above-described connecting device, a part of the vacuum insulated switchgear can be introduced in place of the already-installed gas insulated switchgear 1, and introduction of the vacuum insulated switchgear can be facilitated.

That is, in the present embodiment, the inner conductor of the solid insulated cable 17 is made into, for example, a more linear copper wire to provide flexibility, and the periphery thereof is covered with, for example, an insulating rubber such as silicone rubber, and the periphery thereof is covered with a conductive rubber of a ground potential.

Thus, even if the insulation distance between the bare bus conductors in the gas-insulated switchgear 1 is large and the insulation distance between the solid-insulated buses in the vacuum-insulated switchgear 2 is small, the insulation distance between the solid-insulated cables 17 having flexibility can be adjusted by gradually increasing the insulation distance from the vacuum-insulated switchgear 2 side to the gas-insulated switchgear 1 side, thereby absorbing the difference in insulation distance between the two, and thus achieving connection between buses having different insulation types. As a result of the fact that the bus bars having different insulation types can be connected to each other, the gas insulated switchgear 1 and the vacuum insulated switchgear 2 can be configured by a column plate.

In the present embodiment, the bus bar, the cable, or the like is solid-insulated around the internal conductor, and therefore, even if the insulation distance is shortened, insulation breakdown does not occur, and space can be saved.

Further, according to the present embodiment, two insulated switchgear units having different sizes from each other can be combined (in the present embodiment, the vacuum insulated switchgear 2 is formed smaller than the gas insulated switchgear 1 and combined), and one of them is formed smaller to form a surplus space in which the connecting device can be disposed as in the present embodiment, so that it is not necessary to provide a special space (mounting portion) for disposing the connecting device, and space can be saved as a whole.

Further, according to the present embodiment, since the solid-insulated connecting portions 13, 14, 15, and 16 rotatable together with the solid-insulated bus bar are used, the first solid-insulated bus bar 11, the second solid-insulated bus bar 12, and the solid-insulated cable 17 can be arranged at any angle in the horizontal plane when the layout is changed, and the degree of freedom in design and manufacturing is increased.

Further, the solid-insulated bus bar is configured by combining a plurality of bus bars or the like instead of only one bus bar, and an optimum configuration such as flexibility or a corrugated structure can be selected for each component, and further, since the gas-insulated terminal 21 has a corrugated portion made of an insulator, the insulation distance made of an insulating portion becomes long corresponding to the length of the corrugation between the bare bus bar conductor in the gas-insulated switchgear 1 and the conductive rubber of the solid-insulated cable 17 as the ground potential, and even if the length of the gas-insulated terminal 21 itself is shortened, short-circuiting can be prevented. Thus, there is an advantage that miniaturization of the components can be achieved.

Example 2

Next, a second embodiment of the present invention will be described with reference to fig. 7 and 8. As shown in fig. 8, in the present embodiment, the vacuum insulated switchgear 2 is sandwiched between 2 gas insulated switchgear 1 and 51 to form a column tray structure.

The connection structure between the vacuum insulated switchgear 2 and the gas insulated switchgear 1 in this embodiment is the same as that in embodiment 1, and therefore, the description thereof will be omitted, and the connection structure between the vacuum insulated switchgear 2 and the gas insulated switchgear 51 will be described.

The vacuum insulated switchgear 2 and the gas insulated switchgear 51 in this embodiment are electrically connected by a connecting device in the enclosure 4.

The connecting device in this embodiment is constructed as follows. That is, as shown in fig. 7, a solid insulated connecting portion 63 is disposed above (on the opposite side to the solid insulated connecting portion 15) a solid insulated connecting portion 16 to which one end of a flexible solid insulated cable 17 is integrally and rotatably connected, and the solid insulated connecting portion 63 is integrally formed with a solid insulated cable 67 having the same configuration as the solid insulated cable 17 disposed in the solid insulated housing 4, and is rotatably connected to the solid insulated cable 17 in the horizontal plane around the inner conductor of the connecting portion.

On the other hand, the other end of the solid insulated cable 67 is connected to the gas insulated terminals 71 having the corrugated portions having insulation on the outer periphery, and the insulation distance required in the gas is secured between the adjacent gas insulated terminals 71. The gas insulated terminal 71 is connected to a bare bus conductor by a connecting conductor 72 in the gas insulated switchgear 51.

The solid insulated cable 67 is formed of, for example, twisted copper wire to have flexibility, and is solid insulated by covering the periphery of the inner conductor with insulating rubber such as silicone rubber and covering the periphery with grounded conductive rubber, as in the solid insulated cable 17 of the first embodiment. The solid-insulated connecting portion 63 is covered with an insulating rubber such as silicone rubber around the conductor, and is covered with a grounded conductive rubber around the conductor to provide solid insulation. On the other hand, the periphery of the gas-insulated terminal 71 is not grounded but has an intermediate potential.

By configuring this embodiment, it is needless to say that the same effects as those of embodiment 1 can be obtained, and a plurality of gas-insulated switching mechanisms having a column-plate structure can be used together with the vacuum-insulated switching mechanism.

Claims (11)

1. A switch mechanism is characterized in that a switch mechanism is provided,

a plurality of vacuum insulated switchgear and gas insulated switchgear are arranged side by side and adjacently arranged, the vacuum insulated switchgear has a switch unit having at least a breaking and interrupting function and housed in each of the disks, and a solid insulated bus bar electrically connecting the switch units in each of the disks, the gas insulated switchgear has a switch unit having at least a breaking and interrupting function and housed in each of the disks, and a gas insulated bus bar electrically connecting the switch units in each of the disks,

the vacuum insulated switchgear and the gas insulated switchgear are electrically connected by connecting the solid insulated bus and the gas insulated bus with a flexible conductor.

2. The switch mechanism of claim 1,

the solid insulated bus bar has an inner conductor covered with a solid insulating material and a ground potential maintained around the solid insulating material, and the flexible conductor has an inner conductor formed in a twisted shape and a periphery covered with the solid insulating material and a periphery maintained at the ground potential.

3. The switch mechanism of claim 2,

the flexible conductor, the periphery of which is covered with the solid insulating material, is connected to the bare bus conductor in the gas insulated switchgear through a connection conductor, and is connected to a gas insulated terminal, the periphery of which does not hold a ground potential.

4. The switch mechanism of claim 2,

the solid insulated bus bar is rotatably arranged in a horizontal plane around an inner conductor of the solid insulated connecting portion integrated therewith.

5. The switch mechanism of claim 3,

the insulator covering the inner conductor of the gas insulated terminal is formed in a corrugated shape.

6. The switch mechanism of claim 1,

the other gas-insulated switchgear is electrically connected to the vacuum-insulated switchgear through the flexible conductor, which is a solid insulated conductor, on the opposite side of the vacuum-insulated switchgear from the side where the gas-insulated switchgear is installed.

7. A switch mechanism is characterized in that a switch mechanism is provided,

a plurality of vacuum insulated switchgear and gas insulated switchgear are arranged side by side and adjacently arranged, the vacuum insulated switchgear has a switch unit having at least a breaking and interrupting function and housed in each of the disks, and a solid insulated bus bar electrically connecting the switch units in each of the disks, the gas insulated switchgear has a switch unit having at least a breaking and interrupting function and housed in each of the disks, and a gas insulated bus bar electrically connecting the switch units in each of the disks,

the vacuum insulated switchgear and the gas insulated switchgear are electrically connected by conductor connection between the solid insulated bus and the gas insulated bus, and the dimension in the disk longitudinal direction of the vacuum insulated switchgear is formed shorter than the dimension in the disk longitudinal direction of the gas insulated switchgear.

8. The switch mechanism of claim 7,

the conductor connecting the solid insulated bus bar and the gas insulated bus bar has flexibility.

9. The switch mechanism of claim 8,

the solid insulated bus bar has an inner conductor covered with a solid insulating material and a ground potential maintained around the solid insulating material, and the flexible conductor has an inner conductor formed in a twisted shape and a periphery covered with the solid insulating material and a periphery maintained at the ground potential.

10. The switch mechanism of claim 7,

the other gas-insulated switchgear is electrically connected to the vacuum-insulated switchgear through the conductor, which is a flexible solid insulated conductor, on the opposite side of the vacuum-insulated switchgear to the side where the gas-insulated switchgear is installed.

11. A vacuum insulated switchgear having vacuum switch units each having at least a breaking function and accommodated in each of trays, and a solid insulated bus bar electrically connecting the vacuum switch units in each of the trays,

the solid-state insulated bus is provided with a solid-state insulated bus for electrically connecting with a gas insulated switchgear having a gas insulated bus, and the solid-state insulated bus has flexibility.