JPH0667067B2 - Gas insulated switchgear - Google Patents

Description

The present invention relates to a gas-insulated switchgear installed in a substation or the like.

[Prior Art] As a conventional gas insulated switchgear, there is one shown in FIGS. 7 and 8. In the figure, reference numeral 1 denotes a cylindrical circuit breaker container supported on an operation device box 2 with its axis lined in the vertical direction. The circuit breaker CB is provided in the circuit breaker container, and the circuit breaker CB is disconnected when the circuit breaker CB is inspected. A circuit breaker unit Ucb is configured by accommodating three phases of the breaker inspection grounding devices ES11 and ES12 for grounding both ends of the circuit breaker and the current transformer CT. Further, 3 and 4 are insulating spacers S1 and S2 on the front side of the main container 1, respectively.
Crossbar-shaped first and second busbar containers connected via the first and second busbar containers, respectively.
1 and BUS2, and busbar-side disconnectors DS11 and DS12 that open and close between the busbar and the circuit breaker CB.
And 3 are accommodated in three phases to form first and second busbar side units Ub1 and Ub2.

The first bus bar BUS1 is a disconnector DS11 and an insulating spacer S1.
Conductor embedded in the container and the connection conductor 5 provided in the container 1
Is connected to one end of the circuit breaker CB through
US2 is connected to one end of the circuit breaker CB through the disconnector DS12, the conductor embedded in the insulating spacer S2, and the connecting conductor 6 provided in the container 1.

A unit container 8 supported on a gantry 7 is connected to the back side of the main container 1 via an insulating spacer S3, and a cable head CH connected to the cable C in the unit container 8 is connected.
d, a line-side disconnector DS2 that opens and closes between the cable head and the circuit breaker CB, and a line-side grounding device ES2 that grounds the cable head for three phases are housed to form a line-side unit UL. There is.

One end of the disconnector DS2 is connected to the other end of the circuit breaker CB via the conductor embedded in the insulating spacer S3 and the connecting conductor 9 provided in the container 1, and the other end of the disconnector DS2 connects the connecting conductor 10. It is connected to the cable head CHd via the.

The controller 11 of the circuit breaker CB is housed in the controller box 2,
The operating device 11 is connected to the circuit breaker CB via a connecting rod 12 that penetrates the container 1 in an airtight and slidable manner. Operator boxes 13 and 14 are attached to the outer surfaces of the busbar containers 3 and 4, and the busbar side disconnector DS11 is provided in the operator boxes 13 and 14.
And the operation device of DS12 is stored. Further, operating device boxes 15 and 16 are attached to the outer surface of the unit container 8, and operating devices of the line side disconnecting switch DS2 and the grounding device ES2 are housed in the operating device boxes 15 and 16, respectively. The containers 1, 3, 4 and 8 are filled with SF ₆ gas at a predetermined pressure.

[Problems to be Solved by the Invention] In a conventional gas-insulated switchgear of this type, the three-phase circuit breaker CB of the circuit breaker unit Ucb is arranged in a triangle with the busbar side of the center of the circuit breaker container 1 offset. Therefore, it is not possible to secure a wide space around the connection conductor 6 that connects the circuit breaker CB and the busbar side unit, and it is not possible to mount a current transformer on the connection conductor 6.

Therefore, the configuration of the conventional gas insulated switchgear described above is
As shown in FIG. A, it is suitable when the current transformer CT is mounted only on the connecting conductor that connects the circuit breaker and the line side unit, but it connects the circuit breaker CB and the bus side unit. When attaching the current transformer CT to the connecting conductor 6, or
As shown in FIG. B, it cannot be applied when it is necessary to attach the current transformer CT to the connecting conductors on both sides of the circuit breaker CB.

In addition, as a method of improving the breaking performance of the circuit breaker, a method of increasing the operating force by increasing the size of the breaking section of the circuit breaker and a method of connecting a capacitor in parallel to the breaking section to gradually reduce the re-start voltage generated at the time of breaking However, in the conventional gas-insulated switchgear described above, none of these methods can be applied due to space limitations. Therefore, when attempting to manufacture a device with high blocking performance, it is necessary to redesign the entire device, and it is necessary to change all of the container diameter, connection conductors, arrangement of devices, etc., and it is impossible to standardize the device. was there.

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

[Means for Solving the Problems] The present invention has a cylindrical circuit breaker container arranged with its axis oriented in the up-down direction, and has upper terminals and lower terminals at the upper and lower portions, respectively, and interrupts the respective axis lines. Circuit breaker unit including a three-phase circuit breaker housed in the circuit breaker container in a state of being parallel to the axis of the circuit breaker container; and first and second vertically arranged side surfaces of the circuit breaker container. First and second in the first and second busbar containers respectively connected to the device connection openings via the first and second insulating spacers, respectively.
First and second busbar-side units accommodating the conductors forming the busbars and the first and second busbar-side disconnectors, and the first and second device connection openings of the circuit breaker container. A line side in which a line side disconnector and a cable head are housed in a line side unit container connected to a third device connection opening provided on a side opposite to the above via a third insulating spacer. And a gas insulated switchgear having a unit.

In the present invention, the three-phase circuit breakers of the circuit breaker unit are arranged in a straight line along the radial direction of the circuit breaker container. A first connecting conductor and a breaker for connecting the upper terminals of the breakers of each phase to the first and second busbar side units in one and the other of the two spaces formed on both sides of the row of the three-phase breakers, respectively. A second connecting conductor for connecting the lower terminal of the container to the line side unit is arranged.

The first and second device connecting openings are arranged close to the lower end side of the circuit breaker container, and the peripheral wall of the circuit breaker container and the circuit breaker located above the first device connecting opening are connected to each other. A space in which a current transformer to be mounted on the first connecting conductor can be placed is formed therebetween. The third device connection opening is arranged near the upper part of the circuit breaker container, and the second connection is provided between the peripheral wall of the circuit breaker container on the third device connection opening side and the circuit breaker. A space is formed for arranging the current transformer attached to the conductor. Further, there is a space between the breaker and the first connecting conductor for arranging a capacitor connected between the upper terminal and the lower terminal of the breaker for mitigating the recurrent voltage of the breaker. Has been formed.

[Operation] As described above, without arranging the three-phase circuit breakers in a triangular configuration,
By arranging them in a straight line along the radial direction of the circuit breaker container, wide spaces can be formed on both sides of the row of the three-phase circuit breakers. In the present invention, since both of these spaces are set to a size large enough to dispose the current transformer, it is necessary to dispose the current transformer on both sides of the circuit breaker or only on one side of the circuit breaker. It is possible to use a circuit breaker container of the same diameter in any case of disposing the flow device, and it is not necessary to change the arrangement of the devices in the container. In addition, the space for arranging the capacitor is secured between the circuit breaker and the connecting conductor on the bus side, so that the recoil voltage can be reduced in parallel with the circuit breaker without changing the diameter of the container. The capacitors can be connected in parallel to improve the breaking performance of the circuit breaker, and the breaking performance can be improved by increasing the diameter of the circuit breaker.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show an embodiment of the present invention.
In the figure, Ucb is a circuit breaker unit, Ub1 and Ub2
Are first and second bus-side units, and UL is a line-side unit.

The circuit breaker container 1 is formed in a cylindrical shape, and is supported on the operating device box 2 with its axis oriented vertically. First and second device connection openings 1a and 1b are provided in a portion of the front side of the container 1 below the central part, and a third device connection opening 1c is provided in the upper rear side of the container 1. Is provided.
As shown in FIG. 1, a circuit breaker support frame 20 is disposed at the bottom of the container 1, and a three-phase circuit breaker CB is supported on the frame by shifting the respective axes to the axis of the container 1. Has been done.

The three-phase circuit breakers CB are arranged side by side in a row substantially along the radial direction of the container 1, and the middle-phase circuit breakers CB are arranged so that the central axis thereof coincides with the central axis of the container 1.

Each circuit breaker has a blocking part housed in a cylindrical container 21 filled with SF ₆ gas, and is operated by operating an insulating operation rod 22 led out from one end of the container 21 to perform blocking and closing. An upper terminal 23 and a lower terminal 24 are provided on the upper and lower portions of the container 21, respectively. The insulating operation rods 22 of each circuit breaker are collectively connected to each other by a common crossbar 22a, and then the operation box 2 is operated via an airtight operation shaft 25 attached to the center of the bottom of the container 1.
It is connected to the circuit breaker operating device 26 therein, and the circuit breaker of each phase is operated by the operating device.

When the airtight operation shaft is arranged in the center of the container 1 as described above,
When it is necessary to arrange the bus bar in FIG. 1 to the right in the figure due to the configuration of the entire equipment, the container 1 should be arranged 180 degrees without changing the relationship between the operating device and the circuit breaker. Is possible.

As described above, since the three-phase circuit breakers CB are arranged side by side in a line substantially along the radial direction of the container 1, relatively large spaces Sp1 and Sp2 are formed on both sides of the line of these circuit breakers. Has been done. In the present invention, the inner diameter of the container 1 is set so that both of these spaces have a sufficient insulation distance from the circuit breaker and a sufficient size for disposing the current transformer. .

The upper terminal 23 of each breaker CB has an L-shaped connecting conductor 27.
Is connected to one end of each of the connection conductors 27, and the other end of each connection conductor 27 is connected to one end of the connection conductor 28 arranged in the space Sp1 on the front side with its axis parallel to the axis of the circuit breaker CB. The other end of the connection conductor 28 of each phase is connected to the corresponding phase of the first busbar side unit Ub1 and is also connected to one end of the connection conductor 29. In this embodiment, the connection conductors 27, 28 and 2
The second connecting conductor 9 connects the upper terminal of the circuit breaker to the busbar side unit.

The three-phase connection conductors 29 are arranged with their axes parallel to the axis of the circuit breaker CB and at a minimum insulation distance d, and the other end of each connection conductor 29 has a second busbar side unit Ub2. Connected to the corresponding phase of. The fixed electrode 30 of the grounding device ES11 is attached to the other end of the connecting conductor 29, and the movable electrode 31 of the grounding device is attached to the frame 20.

One end of a connection conductor 32 extending in the radial direction of the container 1 is connected to the lower terminal 24 of each circuit breaker CB, and the other end of the connection conductor 32 is connected to the axis of the circuit breaker CB in the rear space Sp2 in the container 1. One ends of the connecting conductors 33 extending in parallel are connected. The other end of the connection conductor 33 of each phase is connected to the corresponding phase of the line-side unit UL via a connection conductor 34 extending toward the third device connection opening 1c. The fixed electrode 35 of the grounding device ES12 is also attached to the other end of the connecting conductor 32, and the movable electrode of the grounding device is attached to the frame 20. In this embodiment, the connection conductors 32, 33 and 34 form a second connection conductor for connecting the lower terminal 24 of the circuit breaker to the line side unit.

Connection conductor 2 arranged in front side space Sp1 in container 1
8 is equipped with a current transformer CT1. In this way, if the current transformer CT1 is disposed above the container 1, a wide space can be secured beside the portion between the terminals 23 and 24 of the circuit breaker. A capacitor 37 may be provided to reduce the re-elevation voltage of CB. In the illustrated example, the capacitor 37 is arranged so that its axis is parallel to the axis of the circuit breaker so as to straddle both terminals 23 and 24 of each circuit breaker, and both terminals of each capacitor 37 are both terminals 23 and 24 of the circuit breaker. Are electrically and mechanically connected, respectively.

Connection conductor 3 arranged in the back space Sp2 in the container 1
Three current transformers CT2 are mounted on the device 3 side by side in the axial direction of the connecting conductor 33.

The first and second busbar-side units Ub1 and Ub2 are placed in the first and second busbar containers 3 and 4, respectively, to provide the first busbar BUS.
The first and second busbar-side disconnectors DS11 and DS12 for opening and closing between the conductors forming the first and second busbars BUS2 and the respective phases of these busbars and the circuit breaker CB are housed. And the second busbar containers 3 and 4 are laterally (first
It is formed in a cross-shaped tubular shape having duct portions 3a and 4a extending in a direction (perpendicular to the plane of the drawing) and duct portions 3b and 4b extending in the front-rear direction. First and second device connection openings 1a and 1b of the circuit breaker container 1 via two insulating spacers S1 and S2
It is connected to the.

The conductors 41 and 42 of the respective phases, which form the busbars BUS1 and BUS2, respectively, are housed in the conduit portions 3a and 4a extending in the lateral direction of the first and second busbar containers 3 and 4, respectively. Further, the first and second busbar-side disconnectors DS11 and DS12 are arranged near the intersections of the conduit portions 3a, 3b and 4a, 4b of the containers 3 and 4, respectively, and each phase of the first busbar-side unit Ub1. The disconnector DS11 is connected to the connecting conductor 28 via the embedded conductor penetrating the insulating spacer S1 and the conductor 43, and the disconnector D for each phase of the second busbar side unit Ub2.
S12 is connected to the connecting conductor 29 via the conductor 44 and the embedded conductor of the insulating spacer provided so as to penetrate the insulating spacer S2.

Disconnector operator boxes 13 and 14 are supported on the side surfaces of the ends of the first and second busbar containers 3 and 4, and the disconnector operators housed in these operator boxes are connected via an appropriate connecting mechanism. Are connected to the movable contacts of the disconnectors DS11 and DS12. Further, a grounding device operating device box 15 is attached to the lower end of the busbar container 4, and the grounding device operating device housed in the operating device box 15 is connected to the grounding devices ES11 and ES12 via an appropriate mechanism.
Of the movable electrode. Further, a unit monitoring board 46 configured by housing monitoring equipment in a box-shaped container is disposed on the front side of the busbar containers 3 and 4, and a door provided on the front side of the container of the unit monitoring panel is installed. By opening it, the monitoring equipment can be observed.

The track-side unit UL is a track-side unit container 8 in which a track-side disconnector DS2, a track-side grounding device ES2, and a cable head CHd are housed. A connection opening 8a and a hand hole 8b are provided. Container 8 is stand 7
Is supported on the upper side of the container 8, and the device connecting opening 8a of the container 8 meets the third insulating spacer S3 and is connected to the third device connecting opening 1c of the circuit breaker container 1. The female side head of the cable head CHd is attached to the bottom of the container 8, and the male side head 51 attached to the cable C rising from the underground cable pit is attached to the female side head of the cable head CHd of each phase. It is connected. Disconnector DS2
And the grounding device ES2 are arranged in the upper part of the container 8, and the disconnector DS2 and the grounding device ES2 of each phase and the cable head C are provided.
Hd is connected to each other via a connecting conductor 53, and the disconnector DS2 is connected to the connecting conductor 3 of each phase of the circuit breaker unit Ucb via the connecting conductor 54 and the embedded conductor of the third insulating spacer S3.
4 is connected. The handhole 8b is airtightly closed by a cover plate 55.

The containers 1, 3, 4 and 8 are filled with SF ₆ gas at a predetermined pressure.

As described above, in the present invention, the three-phase circuit breakers are arranged side by side in the circuit breaker container so as to extend substantially along the radial direction of the container, so a wide space is secured on both sides of the row of the three-phase circuit breakers. It is possible to arrange the current transformers on both sides of the row of circuit breakers. Further, by disposing the current transformer CT1 above the inside of the container, a capacitor for re-electromotive force relaxation can be connected in parallel to the breaker to improve the breaking performance thereof. The inner diameter of the container 1 is defined by the spaces Sp1 and S on both sides of the row of circuit breakers.
Since each p2 is set to a size capable of accommodating a current transformer, when the current transformers CT1 and CT2 are attached to the connection conductors connected to both ends of the circuit breaker as in the above example, and In any case where the current transformer is mounted only on the connecting conductor connected to one end of the circuit breaker, it is not necessary to change the diameter of the container 1.

In the above example, the height of the circuit breaker container 1 can be changed according to the number of the current transformers CT1 arranged in the front space Sp1 in the container. For example, when it is necessary to increase the number of current transformers CT1 arranged on the front side of the circuit breaker,
The height of the circuit breaker container 1 can be increased as shown in FIG. 4, and the height of the container 1 can be decreased as shown in FIG. 5 when the current transformer CT1 is not required.

Further, in the above example, the axis of the circuit breaker container 1 is arranged in the vertical direction, but as shown in FIG.
The present invention can be similarly applied to the case where the container is placed horizontally (when the axis of the container 1 is arranged in the horizontal direction). In this example, the operating device box 2 is arranged on the front side, and one end in the axial direction of the circuit breaker container 1 laterally placed in the operating device box 2 is connected. The three-phase circuit breaker CB is supported by a plate that closes one end of the container 1 in the axial direction in a row in the radial direction of the container 1, and each circuit breaker can be drawn out through the operator box 2 during inspection. It is like this. The first and second busbar-side units Ub1 and Ub2 are still connected to the device connection openings 1a and 1b provided on the upper side wall of the container 1 via insulating spacers S1 and S2, and the line-side unit UL is provided.
Is connected to an equipment connection opening 1c provided in a plate that closes the other axial end of the circuit breaker container 1 through an insulating spacer S3.

[Advantages of the Invention] As described above, according to the present invention, three-phase circuit breakers are arranged in a line along the radial direction of the circuit breaker container, and a wide space is provided on both sides of the row of three-phase circuit breakers. And the two spaces are set to a size large enough to accommodate the current transformer, and the device connection opening for connecting the busbar container is placed close to the lower end of the circuit breaker container to shut off. Since a space is secured in the upper part of the vessel container, it is the same whether the current transformer is attached to the connecting conductors on both sides of each circuit breaker or the current transformer is attached to only one connecting conductor of the circuit breaker. Diameter vessels can be used. Since a space for arranging the capacitor for re-electromotive force relaxation is formed between the peripheral wall portion of the breaker container and the connecting conductor (first connecting conductor) on the busbar side, the breaker can be maintained without changing the diameter of the container. It is possible to improve the interrupting performance of the circuit breaker by connecting a capacitor for re-electromotive force relaxation in parallel to the interrupting part of the circuit breaker, and to improve the interrupting performance by increasing the diameter of the circuit breaker.

As described above, according to the present invention, it is not necessary to change the diameter of the container when the way of providing the current transformer is changed or when the breaking performance of the circuit breaker is improved. Since there is no need to change the arrangement, standardization of parts can be promoted and the cost of the gas insulated switchgear can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 and FIG.
FIG. 7 is a sectional view taken along the line II-II of FIG. 1 and a sectional view taken along the line III-III respectively, and FIGS. 4 to 6 are schematic views showing other different embodiments of the present invention, respectively. FIG. 8 is a schematic sectional view showing a conventional example, FIG. 8 is a transverse sectional view of a circuit breaker unit portion of the conventional example shown in FIG. 9, and FIGS. 9A and 9B show different ways of providing a current transformer in the circuit breaker unit. It is the single line connection diagram shown. 1 ... Breaker container, 2 ... Operator box, 3, 4 ... Bus container, 2
7, 28, 29, 33 ... Connection conductor, CB ... Circuit breaker, CT
1, CT2 ... Current transformer, ES11, ES12 ... Grounding device for circuit breaker inspection, DS11, DS12 ... Bus-side disconnector, DS2 ... Line-side disconnector, ES2 ... Line-side grounding device, SP1, SP2 ...
Spaces formed on both sides of the circuit breaker, Ucb ... Circuit breaker unit, UL ... Line side unit, Ub1, Ub2 ... Bus bar unit.

Claims (1)

[Claims] 1. A cylindrical circuit breaker container having its axis oriented in the vertical direction, and upper and lower terminals each having an upper terminal and a lower terminal, and the respective axes are parallel to the axis of the circuit breaker container. 3 in the circuit breaker container in the closed state
A circuit breaker unit having a phase circuit breaker, and first and second insulating spacers respectively provided in first and second device connection openings vertically arranged on the side surface of the circuit breaker container. First and second conductors forming the first and second busbars in the connected first and second busbar containers, respectively.
And first and second busbar-side disconnecting switches housed therein
And a third device connection opening provided on a side surface of the circuit breaker container opposite to the first and second device connection openings.
In a gas-insulated switchgear comprising a line-side disconnector and a line-side unit containing a cable head in a line-side unit container connected via an insulating spacer, Breakers are arranged in a straight line along the radial direction of the circuit breaker container, and one of the two spaces formed on each side of the row of the three-phase circuit breakers and the other of the two spaces formed above the breakers of each phase. A first connecting conductor that connects a terminal to the first and second busbar-side units and a second connecting conductor that connects a lower terminal of the circuit breaker to the line-side unit are arranged, and the first and second The device connection opening is located closer to the lower end side of the circuit breaker container and is located between the peripheral wall of the circuit breaker container and the circuit breaker located above the first device connection opening. Arrange the current transformer to be attached to the connecting conductor A space for obtaining is formed, the third device connection opening is arranged near the upper portion of the circuit breaker container, and the peripheral wall of the circuit breaker container on the third device connection opening side and the circuit breaker are connected to each other. A space for arranging a current transformer attached to the second connection conductor is formed between the breaker and the first connection conductor, and the space between the upper terminal and the lower terminal of the breaker is formed. A gas-insulated switchgear characterized in that a space sufficient for connecting a capacitor for re-electromotive force relaxation is formed therebetween.