JPS61196704A - Gas insulated switchgear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas insulated switchgear installed in an electrical station such as a substation.

[Prior Art] As a gas-insulated switchgear installed in a substation, etc., a circuit breaker unit is constructed by housing a circuit breaker, a grounding device, and a current transformer in a common container, and a busbar is connected to a circuit breaker unit or a disconnector unit. There is a line lead-in unit which is constructed by storing a cable head for leading a line cable into a bus 1 into a container together with a disconnector. Figure 4 shows the electrical configuration of each phase of this type of gas insulated switchgear.
Jb2 are the first and second bus units, IJc, respectively.
b is a circuit breaker unit, and Uf is a line lead-in unit. The first and second busbar units Ub1 and Ub2 house first and second busbars 5usi and BUS2 and first and second busbar side disconnectors DS11 and DS12 in busbar containers 1 and 2, respectively. The first and second busbars BUSI and BUS2 are connected to the circuit breaker unit via disconnectors DSII and 312, respectively.

The circuit breaker unit Ucb houses a circuit breaker CB, a bus-side grounding device ES11 and a line-side grounding device ES12 that are closed during inspection of the circuit breaker, and a current transformer CT in a common container 3. One terminal of CB is connected to busbar units Ubl and Ub2 via busbar side connection conductors 4 and 5. The other terminal of the circuit breaker CB is connected to the line lead-in unit Uf via the line-side connecting conductor 6, and a current transformer C1'' is attached to the line-side connecting conductor 6.Movable electrodes of the grounding devices E811 and ES12 is installed by airtightly penetrating the wall of the container 3 (the bushing terminal BS1
and BS2, and a ground wire is connected to both bushing terminals outside the container 3.

The track lead-in unit Uf houses a cable head CI-1d such as a track-side disconnector DS2, and a track-side grounding device FS2 in a common container 7.
6 is connected to the circuit breaker Ucb via the disconnector DS2.

In a conventional gas-insulated switchgear of this type, the circuit breaker CB, the bus-side connecting conductor 5, the line-side connecting conductor 6, etc. are arranged in parallel in the container 3, and the circuit breaker C is arranged at the bottom of the container. The bus-side grounding device ES11 is supported on a support stand, and the bus-side grounding device ES11 is connected between the end of the bus-side connection conductor and the support stand, and the line-side grounding device is supported between the end of the line-side connection conductor 6 on the circuit breaker CB side and the support stand. were provided between each.

[Problems to be Solved by the Invention] In this type of gas-insulated switchgear, it is necessary to measure the main circuit resistance of the rear breaker unit and the characteristics of the current transformer during on-site installation. In order to easily perform these measurements, it is preferable to use bushing terminals 881 and BS2 to allow measurements to be made from outside the device.

However, in this type of conventional gas insulated switchgear,
Since the track side grounding device ES12 was provided at the end of the track side connecting conductor 6 on the circuit breaker side, the bushing terminals BSI and BS
2 could not be used to easily measure the characteristics of a current transformer or the main circuit resistance.

Furthermore, in conventional gas-insulated switchgear, the operating shaft for the bus-side grounding device and the operating shaft for the track-side grounding device are provided separately, and both operating shafts are connected to separate operating devices placed outside the container. Therefore, it is necessary to provide airtight shaft penetration portions at two locations on the side wall of the container of the circuit breaker unit to allow the operation shaft to pass therethrough in an airtight manner, resulting in a problem that the structure becomes lJIM.

Furthermore, in conventional gas-insulated switchgear, both grounding devices were placed in the bottom space of the container, which required many devices to be placed in the bottom space of the container, causing congestion around the grounding device. However, there were problems in that the structure was complicated and it was difficult to design the layout of the equipment.

An object of the present invention is to provide a gas insulated switchgear that solves the above problems.

[Means for Solving the Problems] As shown in FIG. 1 showing an embodiment of the gas insulated switchgear to which the present invention is directed, the circuit breaker CB and one terminal of the circuit breaker CB are The bus bar side connecting conductor 4.5 that connects to the bus bar unit, the line side connecting conductor 6 that connects the other terminal of the circuit breaker CB to the line lead-in unit, and one terminal and the other terminal of the circuit breaker CB are grounded, respectively. It is equipped with a circuit breaker unit UCb in which a bus-side disconnector @ES11, a line-side grounding device ES12, and a current transformer CT attached to the line-side connecting conductor 6 are housed in a common container 10.
- Yes. The circuit breaker CB is supported by a support stand 11 placed at the bottom of the container 10, and the line side connection conductor 6 is placed parallel to the circuit breaker CB. An operating box 12 is located near the container 10.
is arranged, and the bottom of the container 10 is connected to the operator box.

In the present invention, the busbar side grounding device ES11 includes a movable electrode 20 supported on a support base 11 and a fixed electrode 21 connected to the f+1 line side connection conductor 5, and the line side grounding device ES12 includes a A movable electrode 23 supported by a frame 22 placed above the device CT, and a fixed electrode 2 connected to the line conductor lead-in unit side end of the line side connecting conductor 6.
It consists of 4. The movable electrode 23 of the track side grounding device ES12 and the movable electrode 20 of the busbar side grounding device ES11 are connected to a common operating shaft 27,
Bushing terminals 28 and 29 connected to the movable electrodes 20 and 23 of S12 are attached to pass through the wall of the container 10 in an airtight manner.

[Operation of the Invention] As described above, when the line-side grounding device is disposed using the dead space near the current transformer, the space can be used effectively.

In addition, if the line-side grounding device and the bus-side grounding device are placed on both sides of the current transformer as described above, the bushing terminals pulled out from both grounding devices can be used to measure the characteristics of the current transformer and determine the main circuit resistance. Measurements can be easily made.

Furthermore, as mentioned above, by arranging the track-side grounding device at the end of the track-side connecting conductor on the track lead-in unit side, the number of devices installed in the bottom space inside the container can be reduced. It is possible to easily transfer the equipment inside the device to the layerer 1.

Furthermore, if the movable electrode of the bus-side grounding device and the movable electrode of the line-side grounding device are connected to a common operating shaft as described above, it is only necessary to provide one operating shaft of the grounding device, so that the operating shaft of the grounding device Only one airtight shaft penetration part is required for this purpose, and the structure can be simplified.

[Example] The present invention will be described in detail below with reference to the accompanying drawings.

Figures 1 and 2 show a circuit breaker unit according to an embodiment of the present invention.
It is shown in the figure.

In FIGS. 1 and 2, a container 1o is made up of a metal cylinder with its axis oriented vertically, and the upper and lower parts of the front side and the upper part of the rear side of the container 1o are provided with first and second cylinders, respectively. Busbar unit connection portions 10a and 10b and a line lead-in unit connection portion 10c are provided. These connection parts are constructed by welding a nozzle with flanges to holes provided in the side surface of the container 1o, and insulating spacers for bus unit connection are provided on the flanges of the first and second busbar unit connection parts 10a and 10b. 3o and 31, and an insulating spacer 32 for connecting the line lead-in unit is connected to the flange of the line lead-in unit connecting portion 10c, respectively.

A lid plate 10e is hermetically connected to a flange 10d installed at the top opening of the container 10, and a substantially square bottom plate 10o is hermetically connected to a flange 10f installed at the bottom opening of the container 10. The container 10 is placed on the controller box 12, and the bottom plate 10a of the container 10 is connected to the periphery of a hole 12b provided in the ceiling plate 12a of the controller box 12.

A support stand 11 is disposed on the bottom plate 100 of the container 10, and includes leg portions 11a, 11a extending in the axial direction of the container 10, and a support plate portion 11b extending in a direction perpendicular to both legs.
The lower ends of the legs 118.11a are fixed to the bottom plate 100 by welding.

Three-phase circuit breakers CB are arranged on the support plate portion 11b with their respective axes parallel to the axis of the container 10, and the lower end of each circuit breaker is fixed to the support plate portion 11b by appropriate means. , ``a disconnector CB is an insulating container 3 filled with SF6 gas.
This is a gas circuit breaker in which a fixed contact and a movable contact are housed in a container 35 along with an appropriate arc extinguishing mechanism, and external terminals 36 and 37 are provided on the upper and lower side surfaces of the container 35, respectively. One external terminal (fixed contact side terminal in this example) 36 of this circuit breaker is connected to one end of an L-shaped connecting conductor 38 . A conductor connection portion 38a is provided at the other end of the connection conductor 38.
One end of the first bus-side connecting conductor 4 is connected through the connector, and the other end of the connecting conductor 4 can be separated to a conductor connecting portion provided at one end of the embedded conductor 39 of the insulating spacer 30 facing inside the container 10. It is connected to the. A branch part 4a that branches downward is provided in the middle of the bus-side connection conductor 4, and a conductor connection part 4b provided at the lower end of the branch part 4a is connected to the inside of the container 10 in the axial direction (parallel to the circuit breaker CB). One end of the extending second bus-side connection conductor 5 is connected. One end of an L-shaped connecting conductor 41 forming a part of the busbar side connecting conductor is connected to one end of the embedded conductor 40 of the insulating spacer 31 facing inside the container 10, and a conductor connecting portion is provided at a corner of the connecting conductor 41. The other end of the second bus-side connecting conductor 5 is connected to 42 . The other end of the connection conductor 41 facing the bottom plate 10g of the container 10 is connected to the fixed electrode 21 of the busbar side grounding device ES11, and the fixed electrode 21 and the grounding device E are connected to the support plate portion 11b of the support base 11.
The movable electrode 20 constituting S11 is insulated and supported by the support plate portion 11b.

A conductor 41 is connected to the other external terminal (in this example, the movable contact side terminal) 37 of the circuit breaker CB! One end of the line-side connecting conductor 6 is connected to a conductor connecting portion 44a provided at the other end of the conductor 44.

The line-side connecting conductor 6 extends inside the container 10 in parallel with the circuit breaker CB, and a current transformer CT is installed so that the connecting conductor 6 serves as a through conductor. (Lit) of the line side connection conductor 6
(The end of the track lead-in connector) has a conductor connection portion 45a.
One end of the conductor 45 is connected through the conductor 45, and the other end of the conductor 45 is connected to a conductor connection portion provided at the end of the embedded conductor 46 of the insulating spacer 32 facing inside the container 10. conductor 4
5 is connected to a fixed electrode 24 of a line-side grounding device FS12, and is fixed to a frame 22 that is placed in a dead space formed above the current transformer CT and fixed to the container 10 in an insulated state. Grounding device FS1 together with electrode 24
A movable electrode 23 constituting part 2 is supported by the support part 22 in an insulated state.

Fixed electrodes 21 and 2 of earthing devices FS11 and ES, 12
4 consists of a tulip-shaped contactor 1 housed in a shield, and movable electrodes 20 and 23 of both grounding devices.
The movable electrode 20 is made up of a current collecting contact disposed within the shield and an electrode rod that slides in contact with the current collecting contact.
The electrode rods 23 and 23 are linearly displaced in the axial direction of the container 10 to come into contact with and separate from the fixed electrodes 21 and 24.

The operating shaft 27 for operating the grounding devices ES11 and ES12 is a bearing 4 attached to the legs 11a, 11a of the support base 11.
8 and 49, and the operating shaft 27 is connected to the outside of the container 10 through a bearing 50 (constituting an airtight shaft penetrating portion) having an airtight structure that is provided by airtightly penetrating the front lower side surface of the container 10. It has been derived.

Insulated operating rods 20a for operating the electrode rods of the movable electrode 20 of the three-phase earthing device ES11 are interconnected by a three-phase connecting plate 20b, and the connecting plate 20a is connected to the operating shaft 27 via a lever 51. . The insulated operation rod 23a that operates the movable electrode 23 of the grounding device ftfEs12 is connected to the three-phase connecting plate 23.
b, and the connecting plate 23b is connected to one end of a rotating shaft 52a supported by the frame 22 via a lever 52b. One end of a lever 52C is attached to the other end of the rotating shaft 52a, and the other end of the lever 52c is
One end of the lever 52e is fixed to a rotating shaft 52d supported at the end of the frame 22, and the other end of the lever 52e is connected via a link 52f (see FIG. 2).

One end of a lever 520 is also fixed to the rotating shaft 52d,
One end of a link 52h extending in the axial direction inside the container 10 along the inner surface of the container 10 is connected to the other end of the lever 52o. The other end of the link 52h is connected to the other end of a lever 521 whose one end is attached to the operating shaft 27.

A connecting mechanism 52 that connects the movable electrode of the earthing device ES12 to the operating shaft 27 is configured by each part of the rotating shaft 52a to the lever 52i.

The operating shaft 27 is connected to a grounding device operating device housed in an operating device box (not shown) placed outside the container 10, and the rotation of the operating shaft 27 causes the grounding devices ES11 and E to rotate.
The movable electrodes of S j2 are operated to simultaneously approach and separate from the respective fixed electrodes.

The bushing terminals 28 and 29 are separated into three phases and are led out into the operating box 12 through the bottom plate 100 airtightly, and the center conductor of each bushing terminal 28 is connected to the ground of the corresponding phase via the conductor 61. It is connected to the movable electrode 20 of the device ES11.

Further, terminal fittings 62 for three phases are attached to the leg portion 11a of the support base 11 while being insulated from the leg portion, and each terminal fitting is connected to the center conductor of two bushing terminals of the corresponding phase. . Each terminal fitting 62 is connected to the movable electrode 23 of the corresponding phase grounding device ES12 via an electric wire 63.

The bushing terminals 28 and 29 are connected to a grounding wire (not shown) inside the operating box 12, and the movable electrodes of the grounding devices ES11 and ES12 are grounded through the grounding wire.

Insulated operating rod 6 that operates the movable contact of the three-phase circuit breaker CB
5 is the operator box 12 from the lower end of the container of each circuit breaker.
An operating shaft 67 led out to the side and connected to each other by a three-phase connecting member 66, and connected to the connecting member 66, is connected to the container 10.
It is led out into the operating device box 12 through a bearing 68 of an airtight structure attached to the bottom plate 100 of the controller. Operator box 12
A circuit breaker operating device is disposed inside, and an operating shaft 67 is connected to the operating device so that three-phase circuit breakers can be opened and closed at the same time.

The container 10 is filled with SF6 gas using a predetermined pressure saw. The insulating spacers 30 and 31 attached to the connection parts 10a and 10b to the first and second busbar units 1 of the container 10 are equipped with conductors constituting the busbars BUSI and BUS2 and busbar side disconnectors DS11 and DS12, respectively. First and second busbar units Ub1 and Ub2, each housed in a common container, are connected. In addition, the insulating spacer 32 attached to the line lead-in unit 1 to the connection part 10C of the container 10 has a cable head CHd and a line side
A track lead-in unit Uf containing S2 and a grounding device ES2 in a container is connected.

As described above, by arranging the line-side grounding device ES11 in the dead space above the current transformer CT, it is possible to effectively utilize the space. Moreover, since only the busbar side grounding device ES11 is disposed on the bottom side of the container 10, the number of devices disposed on the bottom side of the container can be reduced and the layout of the devices can be facilitated.

Further, as in the above embodiment, the grounding device ES12 is connected to the current transformer C.
When placed on the extension of the axis of T, a space for inspecting the circuit breaker can be secured above the circuit breaker CB, so that inspection of the circuit breaker will not be hindered.

Furthermore, if the movable electrodes of the grounding devices ES11 and ES12 are connected to the common operating shaft 27 as described above,
Since only one airtight shaft penetrating portion is required, the structure can be simplified.

Further, as described above, when the bushing terminals 28 and 29 are led out into the operation box 12 without being exposed to the outside, it is possible to prevent the insulation of the bushing terminals from deteriorating.

Since the grounding devices @Es11 and ES12 are placed on both sides of the current transformer CT, the characteristics of the current transformer and the main circuit resistance can be easily measured using the bushing terminals connected to both grounding devices. .

In the above example, the axis of the container 10 is arranged in the vertical direction, but the present invention can also be applied when the axis of the container 10 is arranged in another direction, for example, in the horizontal direction.

In the above example, the operating shafts 27 of the grounding devices ES11 and ES12 are led out of the container 10, but the operating shafts 27 can also be led out into the operating device box 12.

[Effects of the Invention] As described above, according to the present invention, since the track side grounding device is disposed using the dead space near the current transformer, it is possible to effectively utilize the space inside the container. .

In addition, the line-side grounding device and the bus-side grounding device are placed on both sides of the current transformer, making it easy to measure current transformer characteristics and main circuit resistance using the bushing terminals pulled out from both grounding devices. can be done.

Furthermore, since the track-side grounding device is placed at the end of the track-side connecting conductor on the track lead-in unit side, the number of devices installed in the bottom space of the container can be reduced, and the layout of the devices inside the container can be reduced. can be facilitated.

In addition, since the movable electrode of the bus-side grounding device and the movable electrode of the line-side grounding device are connected to a common operating shaft, only one airtight shaft penetration part is required for the operating shaft of the grounding device, simplifying the structure. It can be done.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of the container of the same embodiment with the lid removed, and FIG.
The figure is a single line diagram showing the electrical configuration of each phase in an embodiment of the present invention, and FIG. 4 is a single line diagram showing the electrical configuration of each phase of a conventional gas insulated switchgear. CB...Breaker, ESll...Bus bar side grounding device, E
S12...Line side grounding device, CT...Current transformer, 4,
5...Bus bar side connection conductor, 6...Line side connection conductor, 1
0... Container, 11... Support stand, 12... Operator box, 20... Movable electrode of grounding device ES11, 21...
Fixed electrode of earthing device ES11, 22...Frame, 2
3... Movable electrode of the grounding device ES12, 24... Fixed electrode of the grounding device ES12, 27... Operation axis, 52...
- A connection m structure that connects the movable electrode of the grounding device ES12 to the operation shaft 27.

Claims (1)

[Scope of Claims] A circuit breaker, a bus-side connecting conductor that connects one terminal of the breaker to a bus unit, a line-side connecting conductor that connects the other terminal of the breaker to a line lead-in unit, A bus-side grounding device and a line-side grounding device for grounding one terminal and the other terminal of the circuit breaker, respectively, and a current transformer attached to the line-side connecting conductor are housed in a common container, and the circuit breaker The line-side connecting conductor is supported on a support placed at the bottom of the container and is arranged parallel to the circuit breaker, and the container includes a circuit breaker unit whose bottom is connected to an operating box. In the gas-insulated switchgear, the bus-side grounding device includes a movable electrode supported by the support base and a fixed electrode connected to the bus-side connection conductor, and the line-side grounding device includes a movable electrode supported by the support base and a fixed electrode connected to the bus-side connecting conductor. a movable electrode supported by a frame disposed near the line conductor, and a fixed electrode connected to the line conductor lead-in unit side end of the line side connecting conductor, the movable electrode of the line side grounding device and the bus bar side The movable electrode of the grounding device is connected to a common operating shaft, and a bushing terminal connected to the movable electrode of the grounding device is installed by penetrating the wall of the container in an airtight manner. Device. (2) The gas insulated switchgear according to claim 1, wherein the bushing terminal is led out into the operating box.