JP2001339820A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size in the lateral direction of a single bus bar- configured gas-insulated switchgear comprising a portion as a keying circuit for connecting a line to a bus bar and portions as bus bar sectioning disconnectors. SOLUTION: A unit case 10 provided with a main case 12 and bus-bar cases 13 and 14 respectively connected with upper and lower branch pipes 12a and 12b installed on a side face of the main case is installed. Bus bar conductors 20, 52, and 56 comprising a single bus bar are housed in the main case 12, the bus-bar case 13, and the bus-bar case 14. The component devices, such as circuit breaker CB and a disconnector DS2, of the keying circuit for line connection are housed in the main case 12 of the unit case 10. Bus bar sectioning disconnectors DS11 and DS12 for sectioning the bus bars are housed in at least one of the bus-bar cases 13 and 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-bus gas-insulated switchgear installed in an electric station such as a substation.

[0002]

2. Description of the Related Art In a substation or the like, when a line or a transformer is connected to each other via one bus, a line connection unit for drawing a line into the bus and a line from the bus are drawn. A line connecting unit for separating the bus and a bus section disconnecting unit that separates the bus are housed in a container together with a grounding switch, and the unitized bus section is arranged side by side and arranged in a horizontal direction, and provided in a series of units, respectively. By connecting the bus conductors in series, a single bus extending in the horizontal direction is configured.

FIG. 6 is a single-line diagram showing a part of the structure of a gas-insulated switchgear having a single bus structure.
S is a single bus, and DS11 and DS12 are first and second bus section disconnectors, respectively. The bus BUS is connected to the unit buses BUS1 to BUS1 by the bus segment disconnectors DS11 and DS12.
BUS3.

[0004] One end of a circuit breaker CB is connected to the unit bus BUS2 through a bus-side disconnector DS2, and a cable head CHd is connected to the other end of the circuit breaker CB.

The unit bus BUS2 is also connected with a bus meter transformer PT and a grounding switch ES12, and the unit buses BUS1 and BUS3 are respectively connected with the bus grounding switch E12.
S11 and ES12 are connected.

[0006] At both ends of the circuit breaker CB, grounding switches E for circuit breaker inspection which short-circuit both ends when the circuit breaker CB is inspected.
S3 and ES4 are connected.

In a conventional earthing switch of this type, a disconnector D
S2, circuit breaker CB, earthing switches ES3 and ES4, and a bus conductor forming a part of unit bus BUS2, constitute a line connection unit U1, and include a bus segment disconnector DS11, an earthing switch ES11, and a unit bus BUS2. The first bus section unit U21 is configured by a bus conductor that forms a part and a bus conductor that forms a part of the unit bus BUS1. Also, the bus section disconnector DS12 and the earthing switch ES1
2, instrument transformer PT, earthing switch ES2, and bus BUS
2 and a bus conductor forming a part of bus BUS3, the second bus division unit U22
Was composed.

FIGS. 7 and 8 show a front view and a top view, respectively, showing the appearance of a conventional gas insulated switchgear, in which devices such as circuit breakers and disconnectors constituting the circuit shown in FIG. Are indicated by reference numerals indicating the respective devices.

In the example shown in FIGS. 7 and 8, a unit container is constituted by a cylindrical container 1A, a container 1B connected to the rear side of the container 1A, and a busbar container 1C connected to a lower part of the front surface of the container 1B. And the container 1A of the unit container
The circuit breaker CB and the earthing switches ES3 and ES4 are housed therein, the cable head CHd is housed in the container 1B, and the bus conductor constituting a part of the bus BUS2 is housed in the bus container 1C. The connection unit U1 was configured.

A bus segment unit U21 is formed by accommodating a bus conductor constituting bus BUS1 and a bus segment disconnecting switch DS11 in the bus container 2.
Is connected to the bus container 1C of the line connection unit U1 via the connection pipe 3.

Further, a bus container 4B is connected to a lower portion on the front side of a cylindrical container 4A disposed on the instrument transformer PT, and a bus constituting a part of the bus BUS2 in the bus container 4B. A bus-bar section disconnector DS12 is housed in a bus-bar container 4C connected to the front upper portion of the container 4A while accommodating the conductor.
And a bus conductor forming a part of the bus BUS3, thereby forming a bus division unit U22. The bus container 4B is connected to the other end of the bus container 1C of the line connection unit U1 through the connection pipe 5.

7 and 8, reference numerals 6 to 8 denote a lower part on the front side of the line connection unit U1, a lower part on the front side of the bus division unit U21, and a bus division unit U, respectively.
22 is an operation box arranged at a lower portion on the front side of the operation panel 22.

[0013]

In the conventional gas insulated switchgear shown in FIGS. 6 to 8, a portion constituting a line connection switching circuit, a portion provided with a bus segment disconnector DS11, and a bus segment segment are provided. Since the portion where the disconnector DS12 is provided is unitized and these three units are arranged side by side, the lateral dimension of the gas insulated switchgear becomes longer, and a large area is required for installing the device. In addition to the necessity, there is a problem that the weight of the apparatus increases.

An object of the present invention is to reduce the installation area and the weight by making it possible to configure a part constituting a line connection switching circuit and a part provided with a bus segment disconnector in one unit. It is an object of the present invention to provide a gas insulated switchgear which reduces the amount of gas.

SUMMARY OF THE INVENTION The present invention relates to a gas insulated switchgear having a single bus and a circuit connection switching circuit provided for connecting a line to the single bus. In the above, there is a main container having a first and a second branch pipe part arranged side by side on the side, a horizontal pipe part extending in a horizontal direction, and a vertical pipe part orthogonal to the horizontal pipe part. A unit container having first and second bus containers each having one end of the vertical pipe portion connected to the first and second branch pipe portions of the main container is provided, and a bus conductor constituting a single bus is mainly used. The first and second bus containers are housed in the container and in the horizontal conduit of the first and second busbar containers. The components of the line connection switching circuit are housed in the main container of the unit container, and the bus segment disconnector for dividing the single bus is accommodated in at least one of the first and second bus containers of the unit container. .

As described above, the bus conductor constituting the single bus is housed separately in the main container and in the two bus containers arranged vertically, and the equipment constituting the line connection switching circuit is arranged in the main container. In addition, when the bus segment disconnector is accommodated in at least one of the bus containers, the portion of the line connection switching circuit and the portion of the bus segment disconnector can be integrated into one unit, so that the gas insulation can be achieved. The horizontal dimension of the switchgear can be reduced, and the installation area can be reduced.

When the bus segment disconnectors are arranged on both sides of the portion constituting the line connection switch circuit, the bus segment disconnect switches on both sides of the portion constituting the line connection switch circuit are placed in the upper and lower bus containers. Can be arranged. With such a configuration, the lateral dimension of the device can be reduced to about 1/3 of the conventional size.

The line connection switching circuit includes, for example, a bus disconnector having one end connected to a bus conductor in the main container, a circuit breaker having one end connected to the other end of the bus disconnector, And a grounding switch for grounding both ends of the grounding switch.

In the case where a cable is used to connect the line connection switching circuit to an external circuit, a third side opening on the side of the unit container opposite to the first and second branch pipes.
It is preferable that the branch pipe section is provided so that the cable head is accommodated in the cable head container connected to the third branch pipe section.

When grounding switches for grounding the bus conductors in the first and second bus containers are provided, these grounding switches are attached to the ends of the first and second bus containers. It is preferable to house it in a switch case.

In the case where a bus transformer for detecting a voltage of a single bus is provided, the transformer is attached to the upper end of the main container, and the transformer is housed in the main container. It is preferable to connect to the bus conductor. In this case, a grounding switch for grounding a portion of the bus conductor accommodated in the main container to which the bus instrument transformer is connected is housed in the main container.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a single-line diagram showing the configuration of a main part of a gas insulated switchgear according to the present invention. The electrical configuration of the gas insulated switchgear shown in FIG. 7 is the same as that shown in FIG. 6, and the single bus BUS is divided into three unit buses by first and second bus segment disconnectors DS11 and DS12. It is divided into BUS1 to BUS3. Grounding switches ES11 and ES are connected to unit buses BUS1 and BUS3.
12 is connected to the unit bus BU2 and the bus disconnector DS2
The cable head CHd is connected via the circuit breaker CB. Grounding switches ES3 and ES4 for circuit breaker inspection are connected to both ends of the circuit breaker CB, and the disconnecting switch DS2, the circuit breaker CB, the grounding switches ES3 and ES4, and the cable head C
Hd constitutes a line connection switching circuit. The unit bus BUS2 is also connected to an instrument transformer PT for the bus, and a ground switch ES2 is connected to a portion of the unit bus BUS2 to which the instrument transformer PT is connected.

In this specification, the term "line" includes not only a line drawn from the outside to the bus, but also a line drawn from the bus to connect a transformer or the like to the bus.

In the example of FIG. 1, it is assumed that the terminal of the cable connected to the transformer T is connected to the cable head CHd. The circuit connection switchgear when the line connected to the transmission line is drawn in is shown except that a line side disconnector is provided between the breaker and the cable head, and an arrester is connected to the conductor connected to the cable head. Is configured in the same manner as in the example.

In a line connection switching circuit for connecting a transformer, a circuit breaker may be omitted in some cases.

In the present invention, when the configuration is such that the bus segment disconnectors are arranged on both sides of the line connection switching circuit as described above, these parts are configured as one unit U to reduce the lateral dimension. Plan.

FIGS. 2 and 3 show the appearance of a main part of the gas insulated switchgear according to the present invention, and FIG.
It was shown to.

2 to 4, reference numeral 10 denotes a unit container. The unit container includes a cylindrical main container 12 supported on an operation box 11 and first and second containers connected to the main container 12. It comprises second bus containers 13 and 14 and a cable head container 15.

The main container 12 has first and second branch pipe portions 12a and 12b which are vertically arranged on the front side surface.
And a third branch pipe portion 12c which is open on the opposite side to the second branch pipe portion, which is provided on the lower part of the side surface on the rear side, and supported on the operation box 11 with its axis oriented vertically. Have been. In the illustrated example, the main body of the main container 12 is vertically divided (in the axial direction) into a first portion 12A and a second portion 12B at a portion above the first branch pipe portion 12a. The flange provided at the lower end of the first portion 12A and the flange provided at the upper end of the second portion 12B are connected in a detachable manner.

In the main container 12, a bus conductor 20, which constitutes a part of the bus BUS, a circuit breaker CB, and a grounding switch ES for grounding a portion of the bus BUS to which an instrument transformer is connected.
2 and 3 are collectively stored for three phases.

More specifically, each phase of the circuit breaker CB
Are a fixed contact in a cylindrical cut-off container 21 filled with an insulating gas having an arc-extinguishing property such as SF ₆ gas, a linear-displacement-type movable contact which is brought into and away from the fixed contact; A gas circuit breaker containing a shut-off unit provided with a gasket, which is arranged with its central axis oriented vertically and supported on a bottom plate of the main container 12 via a gantry 22. . At the upper end and the lower end of the circuit breaker CB of each phase, a fixed contact side terminal 23 connected to a fixed contact and a movable contact side terminal 24 connected to a movable contact in the shutoff part container are provided. An insulating operation rod 25a for operating the movable contact is drawn out from a lower end of the circuit breaker container 21 of each phase breaker, and the insulating operation rods 25a of the three-phase circuit breaker are connected to each other by a three-phase connecting plate 25b. An operating shaft 25 common to the three phases is provided on the connecting plate 25b.
c is attached, and the operation shaft 25c is attached to the main container 1
2 is introduced into the operation box 11 through a bearing having an airtight structure attached to a bottom plate. The operation shaft 25c introduced into the operation box 11 is connected to an output shaft of a circuit breaker operation device 26 disposed in the operation box 11 via an appropriate connection mechanism. Are opened and closed collectively.

One end of a conductor 27 is connected to the fixed contact side terminal 23 of the circuit breaker CB, and the fixed contact 28 of the disconnector DS2 is attached to the other end of the conductor 27 upward. An insulating spacer 30 is attached so as to hermetically close an opening provided on the ceiling plate 29 of the main container 12, and is formed in a substantially inverted L-shape at a conductor connecting portion provided on a buried conductor provided on the insulating spacer. The intermediate portion of the connection conductor 31 is connected. One end of the connection conductor 31 is connected to the bus conductor 20, and the other end of the connection conductor 31 is connected to the movable contact-side element 32 that forms the disconnector DS <b> 2 together with the fixed contact 28.
The movable contact side element 32 is a fixed contact 2
A movable contact 33 in the form of a rod that comes into contact with and separates from the movable contact 8, a support mechanism that supports the movable contact, and an operating mechanism that operates the movable contact are housed in a hollow conductor. Are located. The operation mechanism provided on the movable contact element 32 includes:
An operation lever 34 for operating the movable contact 33 is provided, and the operation lever is connected to an operation shaft 35 supported on the inner surface of the container 12. The operating shaft 35 extends to the outside through the side wall of the main container 12 and is connected to an output shaft of an operating device (not shown) supported on the outer surface of the main container 12.

The fixed contact 36 of the earthing switch ES3 is attached to the end of the conductor 27 connected to the fixed contact side terminal of the circuit breaker CB toward the side wall of the container 12. A fixed contact 3 is provided on the inner surface of the side wall of the container 12.
6, a movable contact-side element 37 constituting a grounding switch ES3 is attached. The movable contact-side element 37 contains a movable contact 38 that comes into contact with and separates from the fixed contact-side element and an operation mechanism that operates the contact 38 in a case. An operation shaft 39 that operates the movable contact 38 is a main container. 12 are airtightly penetrated through the side wall and are led out to the outside and connected to an output shaft of an operating device (not shown).

A partition plate 40 for separating the main container 12 from the inside of the cable head container 15 is attached inside the third branch pipe portion 12c provided on the back side of the main container 12.
An insulating spacer 41 is attached so as to hermetically close an opening provided in the partition plate 40. One end of the connection conductor 42 is connected to a buried conductor provided in the insulating spacer 41, and the other end of the connection conductor 42 is connected to the terminal 24 on the movable contact side of the circuit breaker CB. Connection conductor 42
The fixed contact 43 of the grounding switch ES4 is attached to the lower end of the branch portion provided so as to protrude downward from the intermediate portion. An element 44 constituting a movable contact of the grounding switch ES4 is supported by the gantry 22, and a movable contact 45 provided on the element 44 is connected to a grounding switch provided in the operation box 11 via an appropriate coupling mechanism. It is connected to an operation device (not shown).

A grounding switch ES is provided at the lower end of the bus conductor 20.
Two fixed contacts 46 are attached, and an element 47 constituting a movable contact of the grounding switch ES2 is supported by the gantry 22. The element 47 is provided with a rod-shaped contact 48 that comes into contact with and separates from the fixed contact 46, and the contact 48 is connected to a grounding switch operating device (not shown) in the operating box 11 via an appropriate connection mechanism. Are linked.

First busbar container 13 and first busbar container 14
Are horizontal pipe sections 1 extending horizontally in the longitudinal direction of the bus bar, respectively.
3a and 14a, and a vertical pipe section 13b provided to extend horizontally and perpendicular to the pipe sections 13a and 14a.
And 14b are integrally formed, and one end of each of the vertical pipe sections 13b and 14b is provided with an insulating spacer 5
Branch pipe portions 12a and 1 of the main container 12 through 0 and 51
2b. Each of the insulating spacers 50 and 51 is provided with a buried conductor, and each of the buried conductors is connected to the branch portions 20a and 20b provided on the bus conductor 20 in the main container.

A three-phase bus conductor 52 is accommodated in the horizontal conduit 13a of the first bus container 13, and a first bus segment disconnector DS11 is accommodated in the vertical conduit 13b. The disconnector DS11 includes a fixed contact 53 connected to the buried conductor of the insulating spacer 50 and a movable contact 54 connected to the bus conductor 52.
The operation device 55 for operating S11 is attached to the lower part of the busbar container 13.

Similarly, the horizontal conduit 1 of the second bus container 14
4a accommodates a three-phase bus conductor 56, and the vertical conduit 14
A second busbar section disconnector DS12 is accommodated in b.

The disconnecting switch DS12 includes a fixed contact 57 connected to the buried conductor of the insulating spacer 51 and a movable contact 58 connected to the bus conductor 56. An operating device 59 for operating the disconnecting switch DS12 is provided. It is attached to the lower part of the bus container 14.

The tank 60 containing the instrument transformer PT is connected to the ceiling plate 29 of the main container 12 via the insulating spacer 30, and the terminal of the instrument transformer PT is provided on the insulating spacer 30. The buried conductor and the connection conductor 31 are connected to the bus conductor 20.

The three-phase cable head CHd is accommodated in the cable head container 15, and the terminals of the three-phase cable head are connected to the embedded conductors of the respective phases provided on the insulating spacer 41 through the connection conductors 61. The terminal part 62a of the cable 62 connected to the transformer is connected to the cable head CHd.

In the illustrated example, cup-shaped containers 64 and 65 (see FIGS. 2 and 3) are attached to the ends of the horizontal conduit portions 13a and 14a of the first and second busbar containers. Inside these containers 64 and 65, a busbar container 13
, And ground switches ES11 and ES12 for grounding the bus conductors in the busbars.

The main container 12, the bus containers 13 and 14,
The cable head container 15 has an airtight structure, and SF ₆ gas is sealed in these containers at a predetermined pressure.

As described above, according to the present invention, since the portion constituting the line connection switching circuit and the portion of the bus section disconnector are constituted as one unit, these portions are constituted by a plurality of units. As compared with the gas insulated switchgear, the lateral dimension of the device can be reduced.

In the examples shown in FIGS. 1 to 4, the components of the switching circuit for line connection and the portion of the two bus segment disconnectors are configured as one unit. However, as shown in FIG. The components of the connection switching circuit and the portion of one bus section disconnector may be configured as one unit. In the example shown in FIG. 5, the disconnecting switch DS21, the circuit breaker CB1, and the earthing switches ES31 and ES41 form a line connection switching circuit for connecting the transformer T1 to the bus BUS. And bus bar disconnector DS11
And a ground switch ES11 constitute one unit Ua. In this case, a bus segment disconnector DS1 together with a bus conductor is provided in a bus container connected to a lower portion of the side surface of the main container.
1 is accommodated, and only a bus conductor is accommodated in a bus container connected to the upper part of the side surface of the main container.

In the example shown in FIG. 5, the disconnector DS22
And a circuit breaker CB2 and grounding switches ES32 and ES42 constitute a line connection switching circuit for connecting the transformer T2 to the bus BUS. The components of this switching circuit, the bus segment disconnector DS12 and the grounding switch ES12 Constitute one unit Ub. In this case, only the bus conductor is accommodated in the bus container connected to the lower portion of the side surface of the main container, and the bus segment disconnector together with the bus conductor is accommodated in the upper bus container.

[0046]

As described above, according to the present invention, a bus conductor constituting a single bus is housed separately in the main container and in two bus containers arranged vertically, thereby forming a switching circuit for line connection. And the bus segment disconnector is accommodated in at least one of the bus containers, so that the line connection switching circuit and the bus segment disconnector are integrated into one unit. Can be put together. Therefore, the lateral dimension of the gas insulated switchgear can be reduced, and the installation area can be reduced.

[Brief description of the drawings]

FIG. 1 is a single-line diagram showing a configuration example of a gas insulated switchgear according to the present invention.

FIG. 2 is a front view showing the appearance of a configuration example of the gas insulated switchgear according to the present invention.

FIG. 3 is a plan view showing an appearance of a configuration example of a gas insulated switchgear according to the present invention.

FIG. 4 is a longitudinal sectional view showing a configuration example of a gas insulated switchgear according to the present invention.

FIG. 5 is a single-line diagram showing another configuration example of the gas insulated switchgear according to the present invention.

FIG. 6 is a single-line diagram showing a configuration example of a conventional gas insulated switchgear.

FIG. 7 is a front view showing the appearance of the conventional gas insulated switchgear shown in FIG.

FIG. 8 is a plan view of the conventional gas insulated switchgear shown in FIG.

[Explanation of symbols]

BUS: Single bus, DS11, DS12: Bus section disconnector, DS2: Bus side disconnector, CB: Circuit breaker, ES3, E
S4: Grounding switch for circuit breaker inspection, PT: Bus transformer for instrument, CHd: Cable head.

Claims (6)

[Claims] 1. A gas insulated switchgear having a single bus and a circuit connection switching circuit provided for connecting a circuit to the single bus, wherein the first and second branch pipes arranged vertically are provided. A main container having a side surface, a horizontal pipe portion extending in a horizontal direction, and a vertical pipe portion orthogonal to the pipe portion, and one end of the vertical pipe portion is a first container of the main container.
And the second and first branch pipe sections respectively connected to the first and second branch pipe sections.
A unit container provided with a bus container of the type described above, wherein a bus conductor forming the single bus is accommodated in the main container and in the horizontal conduits of the first and second bus containers, The component device of the circuit is accommodated in the main container of the unit container, and a bus segment disconnector for dividing the single bus is accommodated in at least one of the first and second bus containers of the unit container. A gas-insulated switchgear characterized by the above-mentioned. 2. A gas insulated switchgear having a single bus and a circuit connection switching circuit provided for connecting a circuit to the single bus, wherein the first and second branch pipes arranged vertically are provided. A main container having a side surface, a horizontal pipe portion extending in a horizontal direction, and a vertical pipe portion orthogonal to the pipe portion, and one end of the vertical pipe portion is a first container of the main container.
And the second and first branch pipe sections respectively connected to the first and second branch pipe sections.
A unit container provided with a bus container of the type described above, wherein a bus conductor forming the single bus is accommodated in the main container and in the horizontal conduits of the first and second bus containers, The component equipment of the circuit is housed in the main container of the unit container, and first and second bus segment disconnectors for dividing the single bus inside the first and second bus containers of the unit container, respectively. Housed gas insulated switchgear. 3. A gas insulated switchgear having a single bus and a circuit connection switching circuit provided for connecting a circuit to the single bus, wherein the first and second branch pipes are arranged vertically. A main container having on its side a third branch pipe part opened on the opposite side to the two branch pipe parts, a horizontal pipe part extending in the horizontal direction, and a vertical pipe part orthogonal to the pipe part. And one end of the vertical pipe section is connected to the first and second busbar vessels connected to the first and second branch pipe sections of the main vessel, respectively, and to the third branch pipe section of the main vessel. A unit container provided with a cable head container, wherein a bus conductor constituting the single bus is accommodated in the main container and in the horizontal conduit portions of the first and second bus containers, The components of the circuit are housed in the main container of the unit container, and the switching circuit is connected to an external circuit. A cable head to which a terminal portion of a cable connected to a road is connected is accommodated in the cable head container, and the first and second buses which divide the single bus into first and second bus containers of the unit container, respectively. A gas insulated switchgear accommodating the second bus section disconnector. 4. The line connection switching circuit includes: a bus-side disconnector having one end connected to a bus conductor in the main container; a circuit breaker having one end connected to the other end of the bus-side disconnector; The gas insulated switchgear according to claim 3, further comprising a ground switch that grounds both ends of the circuit breaker. 5. A grounding switch for grounding a bus conductor in the first and second bus containers is accommodated in a grounding switch container attached to an end of the first and second bus containers. The gas insulated switchgear according to any one of claims 2 to 4. 6. A bus meter transformer for detecting the voltage of the single bus is attached to an upper end of the main container, is connected to a bus conductor housed in the main container, and is housed in the main container. The gas insulated switchgear according to any one of claims 2 to 5, wherein a grounding switch for grounding a portion of the bus conductor to which the bus transformer is connected is housed in the main container. .