JPH076651Y2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a gas-insulated switchgear installed in an electric station such as a substation.

[Prior Art] In a gas-insulated switchgear installed in an electrical substation, a circuit breaker element, a cable head element, and a busbar are installed by housing predetermined components of a switch circuit in a container filled with SF ₆ gas. By configuring elements such as elements and connecting predetermined elements to each other according to the configuration of the electric station, units such as a transformer circuit unit, a cable connection circuit unit, a busbar communication circuit unit, and a busbar division circuit unit are configured. is doing. These units are provided with a busbar element at one end side of each unit, and are arranged side by side in a state where the busbar elements are laterally aligned, and the busbar elements of adjacent units are connected to each other so that the busbars of an electric station are connected. Is configured.

FIG. 4 and FIG. 5 show the structure of a cable connection circuit unit of a gas-insulated switchgear that has been used conventionally. In these drawings, E1 'is a busbar element in which the busbar conductor 2 forming the busbar BUS is housed in the busbar container 1 in which SF ₆ gas is sealed. The busbar element E1' is mounted on the installation base 3 via the pedestal 4 Supported.

E21 'is a cable head container 5 containing SF ₆ gas.
The first cable head element, in which the cable head CHd1, the line-side disconnecting switch DS1 and the cable head grounding switch ES1 are housed together with a predetermined connecting conductor, E22 'is a cable head container 6 in which SF ₆ gas is also enclosed. A second cable head element in which a cable head CHd2, a line-side disconnecting switch DS2 and a cable head grounding switch ES2 are housed together with a predetermined connecting conductor. These cable head elements E21 'and E22' are respectively installed bases. It is supported on pedestals 7 and 8 which are arranged side by side on 3.

The first cable head element E21 'is connected to the busbar element E1' via an insulating spacer 9, and the first and second cable head elements E21 'and E22' are connected via an insulating spacer 10. .

The cable heads CHd1 and CHd2 of the cable head elements E21 'and E22' are respectively connected to the terminal portions 11 and 12 of the cables C1 and C2 which are erected from the underground channel for cable erection.

Further, on the side surfaces of the containers 5 and 6, operating device boxes 13 and 14 which store operating devices for operating the disconnecting switches DS1 and DS2 and the grounding switches ES1 and ES2, respectively, are fixed.

[Problems to be Solved by the Invention] In the above-mentioned conventional cable connection circuit unit, since the busbar element and the cable head element are arranged side by side in the horizontal direction, there is a problem that the unit occupies a large area. In particular, when two cable head elements are provided as described above, three elements are arranged in the horizontal direction, so that the occupied area is remarkably increased.

Further, in the conventional device, since the two cable head elements have different configurations, it is necessary to prepare two types of cable head elements, which causes a problem of high cost.

Further, when two cable head elements are provided as in the gas insulated switchgear described above, three elements are arranged side by side, so that when the cable head element E21 ′ located in the middle fails, There was a problem that it was difficult to exchange.

Further, in the conventional device, it is necessary to support the cable head element on the pedestal, so that there is a problem that the number of parts is increased, the mechanical structure is complicated, and the cost is increased.

An object of the present invention is to provide a single busbar element, a first and a second cablehead element having a cable head, a line-side disconnector and a grounding switch for grounding the cablehead, in a gas-separated state. In a gas-insulated switchgear that is connected, it is intended to reduce the area occupied by the device.

Another object of the present invention is to enable two cable head elements having the same structure to be used.

[Means for Solving the Problems] In the present invention, each cable head element includes a cable head, a line-side disconnecting switch, and a grounding switch in a container having one branch pipe portion that horizontally projects from a side surface. The container has a structure in which a branch box of the container is connected to an operating device box in which an operating device for operating the disconnecting switch and the grounding switch in the container is stored.

The first and second cable head elements are symmetrically arranged on the installation base with their respective operator boxes located outside. At the upper ends of the containers of the first and second cable head elements, there are respectively a first and a second
The lower end of the relay container is connected through an insulating spacer, the two relay containers are connected to each other, and the busbar element is arranged at the upper end of the first relay container, and the container of the busbar element is connected to the insulating spacer. It is connected to the 1st relay container via.

The busbar element is electrically connected to the first and second cable head elements via connection conductors arranged in the first relay container and the second relay container.

[Operation] As described above, when the busbar element and the cable head element are arranged side by side in the vertical direction and the lower part of the container of the busbar element and the upper part of the container of the cable head element are connected via the relay container, The area occupied by the cable connection circuit unit can be reduced as compared with the case where these elements are arranged side by side in the horizontal direction.
In addition, since the frame that supports the busbar element is not required,
The structure can be simplified.

Furthermore, if two cable head elements having the same structure are used and both cable head elements are symmetrically arranged below the relay container, not only the area occupied by the unit can be reduced but also one set of cables can be pulled in. The cost can be reduced because the cable head element can be standardized depending on the case and the case where two sets of cables are drawn. Further, when a failure occurs in the cable head element, the element can be easily replaced.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment of the present invention, and the electrical construction of the embodiment is shown in FIG. In this example, an installation base 24 is provided on the floor surface 23, and the first and second cable head elements E21 and E22 are arranged side by side on the installation base 24.

A first cable head element E21 arranged on the right side in FIG. 1 comprises a cylindrical cable head container 21 arranged with its axis oriented vertically, and the opening at the lower end of this container 21 is hermetically closed. Three-phase cable heads CHd1 arranged in a triangle on the cover plate 22 are attached in an upright state.

A branch pipe portion 21a protruding in the horizontal direction is provided on a side surface of the container 21, and an opening portion of the branch pipe portion 21a is airtightly closed by a cover plate 27. The movable electrode 28a of the earthing switch ES1 for grounding the cable head is attached to the inside of the lid plate 27, and the conductor 30 having the movable electrode 29a of the disconnector DS1 at the upper end is supported via the insulating support 31. A fixed electrode 28b, which constitutes the earthing switch ES1 together with the movable electrode 28a, is attached to the lower end of 30. The conductor 30 of each phase is connected to the terminal of the cable head CHd1 of the corresponding phase via the connection conductor 32. The opening at the upper end of the container 21 is hermetically closed by the insulating spacer 33, and the upper end of the connecting conductor 34 is connected to the through conductor provided in the insulating spacer. A fixed electrode 29b is attached to the lower end of the connection conductor 34, and the fixed electrode 29b and the movable electrode 29a constitute a line side disconnector DS1.

The branch box 21a of the container 21 is provided with the operator box 3 through the cover plate 31.
The operation unit 36 of the disconnecting switch DS1 and the operation unit 37 of the grounding switch ES1 are housed in the operation unit box 35. Disconnector D
The operating rods for operating the respective movable electrodes of S1 and the grounding switch ES1 penetrate the cover plate 27 in a gastight and slidable manner, and an operating device box.
These operating rods are led out to the inside of 35 and are connected to the operating devices 36 and 37.

A door 38 is attached to the front surface of the operation device box 35, and the operation devices inside can be inspected by opening the door.

The second cable head element E22 includes a cable head container 21, a disconnecting switch DS2 and a grounding switch ES2 housed in the cable head container together with a predetermined connecting conductor.
With the insulating spacer 33 attached so as to close the upper end of the container 21, and the operating device box 35 accommodating the operating devices 36 and 37 of the disconnecting switch DS2 and the grounding switch ES2, the first cable head element E21 and It is configured in exactly the same way.

The first cable head element E21 and the second cable head element E22 are back-to-back, i.e. with their respective actuator boxes 35 facing opposite sides, the installation base.
24 symmetrically arranged.

The lower end of the first relay container 20 is connected to the insulating spacer 33 that closes the upper end of the container 21 of the first cable head element E21. The first relay container 20 is composed of a cylindrical container whose axis is oriented in the vertical direction.
A branch pipe portion 20a is provided which is oriented in a direction opposite to the branch pipe portion 21a of 21.

A branch pipe portion 46a provided at a lower portion of a second relay container 46 whose axis is oriented in the horizontal direction is connected to the insulating spacer 33 that closes the upper end of the container 21 of the second cable head element E22. One end of the second relay container 46 in the axial direction is the first
Is connected to the branch pipe portion 20a of the relay container 20, and the other end of the second relay container 46 is hermetically closed by a cover plate 47.

A busbar container 43 is connected to an upper end of the first relay container 20 via an insulating spacer 42, and a connection between the through conductor of the insulating spacer 42 and the through conductor of the insulating spacer 33 extends in the relay container 20 in the axial direction. Connected by conductor 44. Further, the through conductor of the insulating spacer 33 at the lower end of the second relay container 46 is connected to the first relay container by the connecting conductor 48 provided in the relay container 46.
Connected to conductor 44 in 20.

The busbar container 43 is a cross-shaped container similar to the busbar container 1 shown in FIG. 4, and has a horizontal pipe line portion 43a extending in the horizontal direction and a vertical pipe line portion 43b extending in the vertical direction. The lower end of the vertical conduit portion 43b is connected to the insulating spacer 42 in a state where the portion 43a is orthogonal to the direction of the branch pipe portion 21a of the container 21.

Both ends of the horizontal conduit portion 43a of the busbar container 43 are closed by insulating spacers (not shown), and three-phase busbar conductors 44 arranged in parallel in the horizontal conduit portion 43a are provided at both ends of the horizontal conduit portion 43a. Supported by an insulating spacer. Vertical conduit part of busbar container 43
The opening at the upper end of 43b is closed airtight by a cover plate 45. The busbar container 43 and the busbar conductor 44 housed therein form a busbar element E1.

Below the installation base 24 are cable heads CHd1 and CHd2 in the first and second cable head elements E21 and E22.
Underground trenches 25A and 25B for cable startup facing each
Are provided, and the terminal portions 26A and 26B of the cables C1 and C2 raised from the underground trenches 25A and 25B are connected to the cable heads CHd1 and CHd2 in the underground trenches, respectively.

SF ₆ gas is sealed at a predetermined pressure in the container 21 of the first and second cable head elements, in the relay containers 20 and 46, and in the bus bar container 43, and the bus bar element E1 and the cable head elements E21 and E22 are filled. A cable connection circuit unit is constituted by and. Appropriate units such as a transformer connection circuit unit and an inter-busbar connection circuit unit are arranged beside this unit, and the busbar elements of each unit are connected to each other to form a predetermined switching circuit.

As described above, when the first and second cable head elements E21 and E22 are symmetrically arranged in the direction perpendicular to the longitudinal direction of the busbar, and the busbar element is arranged above these cable head elements, The installation area can be reduced as compared with the conventional gas-insulated switchgear in which the busbar element and the two cable head elements are arranged side by side in the horizontal direction.

Further, when configured as in the above embodiment, the busbar container 43 can be supported without providing a gantry, and the cable head container 21 can also be supported without using a gantry, so that the structure can be simplified.

Further, as in the above-mentioned embodiment, when the operator box containing the operators for operating the devices of both cable head elements is arranged outside the two cable head elements,
A wide space can be secured on the side of the operating device box to facilitate operation and inspection of the operating device.

Further, as described above, when the operating device box is connected to the branch pipe part protruding from the container of the cable head element, the operating device in the operating device box can be connected to a predetermined device through the branch pipe part. It is possible to prevent the links that connect between and from being exposed to the outside, thereby improving the reliability of the operating mechanism and simplifying the appearance.

Furthermore, when the cable head element is supported in a state where the cable head faces the underground groove for cable start-up provided below the installation base as in the above embodiment,
Since a frame for supporting the cable head element is not necessary, the number of parts can be reduced and the cost can be reduced.

Further, as described above, when the first and second cable head elements having the same configuration are arranged symmetrically,
As shown in FIG. 3, by removing the second relay container from the first relay container and omitting the second cable head element, it is possible to cope with the case of pulling in one set of cables. In this way, the cable head having the same structure can be used when pulling in one set of cables and when pulling in two sets of cables as in the embodiment of FIG. According to the present invention, as described above, the first and second cable head elements are symmetrically arranged in the direction perpendicular to the longitudinal direction of the bus bar. Since the bus bar element is arranged above these cable head elements, the installation area is reduced as compared with the conventional gas-insulated switchgear in which the bus bar element and two cable head elements are arranged horizontally. There is an advantage that can be achieved.

Further, according to the present invention, a pedestal for supporting the busbar element is not required, so that the structure can be simplified.

Further, according to the present invention, since two cable head elements having the same structure are used, there is an advantage that the cable head elements can be standardized and the cost can be reduced.

Furthermore, in the present invention, since the two cable head elements are arranged below the bus bar element, it is possible to easily replace the cable head elements even if any of them fails. There is.

Further, since the operating device box is connected to the branch pipe part protruding from the cable head element container, the operating device in the operating device box can be connected to a predetermined device through the branch pipe part, and the operating device and the device It is possible to improve the reliability of the operating mechanism and simplify the appearance by preventing the links connecting the elements from being exposed to the outside.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing the construction of an embodiment of the present invention, and FIG.
FIG. 1 is a single wire connection diagram showing the electrical configuration of the embodiment of FIG. 1, and FIG. 3 is a drawing of a single cable by removing the first cable head element from the gas insulated switchgear shown in FIG. Cross-sectional views showing examples of the above, FIG. 4 and FIG.
The drawings are a plan view and a schematic sectional view, respectively, showing the configuration of a conventional gas-insulated switchgear. E1 ... Bus element, E21 ... first cable head element, E22 ... second cable head element, CHd1, C
Hd2 ... Cable head, ES1, ES2 ... Grounding switch, 20 ... Relay container, 21 ... Cable head container, 24 ... Installation base, 25, 2
5A, 25B ... Underground ditch, 35 ... Operator box, 36 ... Disconnector operator,
37 ... Installed switch operating device, 43 ... Bus container, 44 ... Bus conductor.

Claims (1)

[Scope of utility model registration request] 1. A single busbar element, first and second cable head elements each having a cable head, a line-side disconnector, and a grounding switch for grounding the cable head are connected in a gas-separated state. In the gas-insulated switchgear configured as described above, each cable head element stores the cable head, the line-side disconnector, and the ground switch in a container having one branch pipe portion that horizontally projects from the side surface, The branch pipe portion of the container has a structure in which an operating device box storing an operating device for operating a disconnecting switch and a grounding switch in the container is connected, and the first and second cable head elements are respectively operated. Containers of the first and second cable head elements, which are arranged symmetrically with the container box positioned outside and are arranged side by side in a direction orthogonal to the longitudinal direction of the busbars. The lower ends of the first and second relay containers are connected to the upper ends through insulating spacers to connect the two relay containers to each other, and the bus bar element is disposed on the upper end of the first relay container. The container of the busbar element is connected to the first relay container via an insulating spacer, and the busbar element is connected to the first relay container and the second relay container via connection conductors arranged in the first relay container and the first relay container. And a gas-insulated switchgear electrically connected to the second cable head element.