JPH0620328B2 - Gas insulated switchgear - Google Patents

Description

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

2. Description of the Related Art Recently, as a gas-insulated switchgear installed in a substation or the like, a gas-insulated switchgear having a structure in which a plurality of devices constituting the switchgear are housed in a common metal container filled with a relatively low-pressure insulating gas has attracted attention. . According to this structure, it is possible to make the structure much simpler than a gas-insulated switchgear of the type in which each device is housed in a separate annular container and the containers are connected to each other via an insulating spacer. In addition, it is possible to reduce the size of the device and save the installation space. Furthermore, since the appearance can be simplified, harmony with the surrounding environment can be achieved.

By the way, in this type of device that has been conventionally proposed,
The power receiving side unit including the circuit breaker and the cable head for pulling the cable into the circuit breaker and the bus bar side unit including the bus bar side disconnector for connecting the circuit breaker to the bus bar are housed in a common container. If an accident occurs on either the power receiving side or the power receiving side, the entire operation needs to be stopped, which is not preferable. Further, in the conventionally proposed device, the circuit breaker is mounted horizontally, so if the bolts supporting the circuit breaker are removed during maintenance and inspection of the circuit breaker, the circuit breaker suddenly receives its own weight and the circuit breaker There is a risk of falling, and the work of attaching and detaching the circuit breaker at the time of maintenance and inspection is troublesome and there is a drawback that it is dangerous.

Object of the invention It is an object of the present invention to prevent an accident from occurring on one of the busbar side and the power receiving side from affecting the other, and to easily and safely attach and detach the circuit breaker. It is to provide a gas-insulated switchgear capable of performing the above.

Structure of the Invention The present invention provides a circuit breaker configured by housing a circuit breaker and an operating mechanism for operating the circuit breaker in a housing, and at least one set electrically connected to one terminal of the circuit breaker. In the present invention, there is provided a gas-insulated switchgear comprising: a busbar-side disconnector; and a cable head that draws in a cable electrically connected to the other terminal of the cutoff portion. There is provided a substantially cylindrical main container having an opening at the upper end and arranged in the vertical direction and having second to fourth openings that are opened in the horizontal direction in the body. The circuit breaker is vertically inserted from the first opening of the main container into the main container with the blocking part facing downward, and is provided with a support plate that hermetically closes the first opening. Supported by. The at least one set of busbar-side disconnectors is housed in an auxiliary container and is provided with a first uppermost opening provided in a body of the main container or a second opening provided below the first opening. Is attached via an insulating spacer, and the cable head is attached to a fourth opening provided at the lowermost part.

As described above, when the power receiving side device is attached to the main container and the bus side device is attached to the main container in a gas-divided state,
When an accident occurs on the bus side or the power receiving side, the side where no accident has occurred can continue operation and prevent the entire power failure state.

When removing the circuit breaker from the main container in the above configuration, the bolt attaching the circuit breaker may be removed to pull the circuit breaker upward. If the circuit breaker is removed by pulling it upwards in this way, the circuit breaker will not drop suddenly due to its own weight when the bolts that secure the circuit breaker are removed. Work can proceed safely.

When the circuit breaker is vertically arranged with the circuit breaker facing downward as described above, the insulating arc-extinguishing medium around the circuit breaker is located above the circuit breaker and quickly moves to the side of the operating mechanism that does not generate heat. Move to. Therefore, the convection of the insulating arc-extinguishing medium in the circuit breaker can be promoted to improve the heat radiation from the circuit breaker, and it is possible to prevent the blocking performance from deteriorating due to the temperature rise of the insulating arc-extinguishing medium.

Further, as described above, when the busbar-side disconnector is attached to the second or third opening provided in the body of the main container and opened in the horizontal direction through the insulating spacer, the insulating spacer is arranged vertically. Therefore, it is possible to prevent dust from accumulating on the spacer and deteriorating the insulating performance.

Further, when the main container is formed in a cylindrical shape as described above, the strength of the main container can be increased, so that the deformation of the container due to an increase in internal pressure can be prevented and a highly reliable device can be obtained. Since the strength of the main container can be increased, the rated voltage can be increased by increasing the gas pressure in the main container.

As described above, by providing the second and third openings in the body of the main container so that the busbar-side disconnectors can be attached to these openings, it is possible to configure a switching circuit having a double busbar structure. Of course, by using one of the second and third openings, it is possible to form a switching circuit having a single busbar structure.

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

1 to 4 show an embodiment in which the present invention is applied to a switchgear having a double bus bar structure. FIG. 1 is a front view and FIG. 2 is a right side of FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. 1, and FIG. 4 is a single wire connection diagram showing the electrical configuration of each phase of the embodiment.

In FIG. 4, BS1 and BS2 are first and second busbars respectively, CB is a circuit breaker, and one end of the circuit breaker CB is first and second via first and second busbar side disconnectors DS11 and DS12. 2 busbars BS1 and BS2, respectively. The other end of the circuit breaker CB is connected to the cable head CH via the line side disconnector DS2, and the cable head CH
A cable C is connected to. Track side disconnector DS2
Grounding device ES1 for line side disconnector between the line side terminal and ground
Is provided. Further, a current transformer CT is attached to a conductor portion connecting the line-side disconnector DS2 and the cable head CH, and an instrument voltage transformer LPT is connected to a line-side terminal of the line-side disconnector DS2.

In this embodiment, two sets of the gas-insulated switchgear GIS having the above-described structure are provided, and the two sets of gas-insulated switchgear GIS are arranged side by side in the lateral direction as shown in FIGS. 1 and 2. Has been done. The mechanical configurations of both gas insulated switchgear are exactly the same. The internal structure of each gas insulated switchgear GIS will be described below with reference to FIG.

In FIG. 2, reference numeral 1 is a main container formed in a vertically long cylindrical shape, and the main container is supported on the installation base 2 with its axis lined in the vertical direction. A first opening portion 101 is provided at the upper end of the main container 1, and second to fourth openings opening in the direction perpendicular to the first opening portion 101 on the back side of the body portion.
The openings 102 to 104 are provided side by side in the vertical direction. Further, a fifth opening 105 is provided at a substantially central portion on the front side of the main container, and a sixth opening 106 is provided at a lower end portion thereof, and the sixth opening 106 of the main container 1 is the bottom plate 1.
It is hermetically closed by 10. The second to fifth openings 102 to 105 are formed by welding a cylindrical tubular body 111 to the periphery of the hole provided in the body of the main container 1, and the opening ends of the openings 102 to 105 ( Each tubular body 1
Mounting flanges 102a to 105
a is provided. All of these openings are formed to have the same diameter, and holes for bolt insertion are provided in each mounting flange at the same pitch to standardize the mounting flange.

A mounting flange 101a is provided on the periphery of the first opening 101 at the upper end of the main container 1, and the mounting flange 101a is provided.
A circuit breaker support plate 112 is disposed on the upper side of the circuit board, and the three-phase circuit breaker CB is supported by the support plate. Each circuit breaker CB has a cylindrical housing 4 including an insulating arc extinguishing medium (for example, SF6 gas) and an interrupting section including a fixed contact, a movable contact and an appropriate arc extinguishing mechanism, and an operating mechanism section for operating the interrupting section. It is stored in. The cutoff portion is arranged from a substantially middle portion in the longitudinal direction of the housing 4 to a tip portion thereof.
A fixed-side terminal electrode 5 connected to the fixed contact is provided at the tip of, and a movable-side terminal electrode 6 connected to the movable contact is provided on the side surface of the housing 4 at the substantially central portion in the longitudinal direction. The three-phase circuit breakers CB are arranged in a triangle so that the central axis of each container 4 extends parallel to the axis of the main container through the apex of a virtual triangle on a horizontal plane, and the housing 4 of each circuit breaker has a support plate 112. It is supported by the support plate 112 by penetrating a mounting hole provided in the. A flange 4a is provided at the upper end of the housing 4, and the flange 4a
Is in contact with the periphery of a mounting hole provided in the support plate 112, and the flange 4a is connected to the support plate 112 so as to hermetically close the mounting hole. A substantially cylindrical cover 7 is attached to the end of the housing 4 located outside the main container 1 to cover the end of the operating mechanism for operating the movable contactor of the circuit breaker. It is closed to. The cover 7 can be removed from the housing 4. By removing this cover, the inside of the housing 4 of each circuit breaker can be inspected without opening the inside of the main container 1. In this embodiment, the movable side terminal electrode 6 of the three-phase circuit breaker CB is provided so as to face the second opening 102 of the main container 1, and the fixed side terminal electrode 5 is provided in the third opening 103. It is provided to face you.

A device mounting plate 113 is attached so as to hermetically close the fifth opening 105 on the front surface side of the main container 1, and the line side disconnector DS2 is supported on the inner surface of the device mounting plate 113. The disconnector DS2 is composed of a movable contactor unit 14 and a fixed contactor unit 15 supported by a substantially V-shaped insulating support 13, with the movable contactor unit positioned on the circuit breaker side, and both contactor units. The central axes of 14 and 15 are arranged in the vertical direction. The movable contactor unit 14 comprises rod-shaped contacts arranged in a shield so as to be linearly moved by an appropriate operating mechanism, and the fixed contactor unit 15 shields tulip contacts which the movable contactor contacts and separates. It consists of the one arranged inside. The movable contactor of the disconnector DS2 of each phase is connected to the fixed-side terminal electrode 5 of the circuit breaker CB of the corresponding phase via the connection conductor 17. One end of the connection conductor 18 is connected to the fixed-side contactor unit 15 of each disconnector DS2,
The other end of the connection conductor 18 is connected to a terminal of a voltage transformer LPT for an instrument fixed to the bottom plate 102 of the main container 1.
A grounding device fixed electrode 19 is provided on the connection conductor 18 connected to the fixed contactor unit 15 of each disconnector DS2, and the grounding device ES is provided in the vicinity of the fixed electrode 19 together with the fixed electrode 19.
A rotary type movable electrode 20 for a grounding device, which constitutes No. 1, is arranged. The movable electrode 20 is supported on the main container 1 by an appropriate means.

On the front side of the main container 1, the operation device boxes 21 and 2 are arranged vertically.
2 are arranged, the upper operation box 21 is supported by the body of the main container 1, and the lower operation box 22 is supported by the device mounting plate 113. The operation device of the circuit breaker CB is accommodated in the upper operation device box 21, and the operation devices of the disconnector DS2 and the grounding device ES1 are accommodated in the lower operation device box 22. The operation device in each operation device box is connected to the operation shaft of the corresponding device via a link mechanism or the like.

When the circuit breaker CB is vertically mounted in the main container through the first opening 101 at the upper end of the main container as in this embodiment, the circuit breaker support plate 112 is used when the circuit breaker is removed from the main container. It is sufficient to remove the bolts that fix the container to the main container and pull the support plate 112 upward. In this case the support plate 1
Even if the bolt fixing 12 is removed, the circuit breaker CB does not drop due to its own weight, which is safe. If the circuit breaker is mounted with the circuit breaker facing downward as described above, the insulating arc extinguishing medium heated by energization can be moved to the operation mechanism side that does not generate heat. The convection of the arc medium can be promoted to improve the heat dissipation of the circuit breaker, and it is possible to prevent the interruption performance from deteriorating due to the temperature rise of the gas.

Second and third openings 102 and 1 on the back side of the main container 1
First and second busbar side disconnector units 23 and 24 are attached to 03, respectively.

Each busbar-side disconnector unit has a cross tube shape (see FIG. 2) including a first tubular portion 25a and a second tubular portion 25b provided so as to be orthogonal to the first tubular portion 25a. The auxiliary container 25 formed is provided. The auxiliary container 25 of each of the busbar-side disconnector units 23 and 24 has one end of its first tubular portion 25a aligned with the second and third openings 102 and 103, and the second tubular portion 25b laterally. The first tubular portion 25a is disposed on the rear side of the rear side of the main container in a state of being directed toward the opening, and one end of the first tubular portion 25a is provided with the insulating spacer 26 therebetween.
Airtightly connected to 2 and 104 by flange coupling. A three-phase conductor 27 that hermetically penetrates the insulating spacer 26
Is provided, and the disconnector fixed contactor unit 28 is attached to the ends of these conductors located inside the auxiliary container 25. First and second busbar side disconnector units 23 and 2
In the second tubular portion 25b of the auxiliary container 25 of No. 4, three-phase busbar conductors 30 constituting the first and second busbars BS1 and BS2 are arranged in parallel, and these busbar conductors 30
Are supported by insulating spacers 31 attached so as to hermetically close both ends of the second tubular portion 25b. To the busbar conductors 30 of each phase of the first and second busbar side disconnector units 23 and 24, a disconnector movable contactor unit 32 facing the corresponding disconnector fixed contactor unit 28 of the corresponding phase is attached. . Each movable contactor unit 32 is a bar-shaped contactor that is linearly displaced and comes in contact with and separated from the fixed contactor 28, and is arranged in a shield together with its drive mechanism. The fixed contactor unit 28 and the movable contactor unit 32 form a first busbar-side disconnector DS11. Further, the second busbar-side disconnector DS12 is provided by the disconnector fixed contact 28 and the movable contactor unit 32 of each phase of the second busbar-side disconnector unit 24.
Is configured. First tubular portion 25 of each auxiliary container 25
A cover plate 33 is attached so as to hermetically close the rear side opening of a, and bus line side disconnectors DS11 and DS12 are provided on the outer surfaces of the cover plates 32 of the first and second bus line side disconnector units 23 and 24.
Operating device boxes 34 and 35 accommodating operating devices for operating the are attached. The operating devices in the operating device boxes 34 and 35 are movable by a suitable mechanism such as a link or the like provided through the side wall of the first tubular portion 25a or the cover plate 32 in a hermetic manner to disconnect the corresponding disconnector DS11 or DS12. It is connected to the operation shaft of the contactor unit 32. Reference numeral 36 is a shield provided between each disconnector and the mechanism for connecting the disconnector DS11 or DS12 to the operating device. In this way, when the operating device of the busbar side disconnector is housed in the operating device box attached to the auxiliary container for housing the disconnector, the disconnector and the operating device can be connected in a short distance. , The link mechanism connecting them can be simplified.

The conductor 27 of each phase provided on the insulating spacer 26 of the first busbar disconnector unit 23 is connected to the movable terminal electrode 6 of the circuit breaker CB of the corresponding phase via the connecting conductor 37, and the second Insulation spacer 26 of busbar side disconnector unit 24
27 is connected to the movable side terminal electrode 6 of the circuit breaker CB of the corresponding phase through the connection conductor 38.

As described above, when the busbar-side disconnector is attached to the second or third opening opening in the horizontal direction via the insulating spacer, the insulating spacer is arranged vertically, so that the insulating spacer is protected from dust. It is possible to prevent the deterioration of the dielectric strength due to the accumulation.

A cable head unit 40 is arranged below the second busbar-side disconnector unit 25. This cable head unit 40 includes a tubular container 41 arranged with its axis oriented horizontally, and one end of the tubular container 41 has the main container 1
Is airtightly connected to the fourth opening 104. A lid plate 42 is attached so as to hermetically close the opening of the tubular container 41, and a slip-on type cable head CH is attached to the lid plate. The cable head CH is composed of a connector 43 attached to the end of the cable C and a receptacle 44 for connecting the connector in a removable manner. The receptacle 44 is attached to the lid plate 42 from the inside, and the connector 43 is attached to the receptacle from the outside. Ready to connect. The terminal of the receptacle 44 of the cable head CH is connected via the connection conductor 46 to the conductor connection portion 45 connected to the conductor 18 which connects the disconnector DS2 of the corresponding phase and the transformer LPT for the instrument, and the inside of the tubular container 41. A current transformer CT is attached to each connecting conductor 46 extending in parallel.

In this embodiment, the cable head CH is configured to be attached / detached in the horizontal direction on the back side of the main container. With this configuration, a wide space can be secured on the back side of the main container, so that the work of connecting the cable head can be facilitated. Further, since it is not necessary to secure a working space for attaching and detaching the cable head in the cable pit P provided in the basement, the depth of the cable pit can be reduced.

The main container 1 and each auxiliary container 25 are filled with an insulating gas such as SF6, and the pressure of this gas is usually set to a low value of ² kg / cm ² or less. In addition, in the present invention, since each container including the main container is formed into a cylindrical shape, the strength of each container can be increased. Therefore, the rated voltage can be increased by increasing the pressure of the gas filled in each container above the above value.

A rectangular parallelepiped cover container 60 is attached to the front side of the main container 1, and a cover 7 attached to the end of the circuit breaker CB, operation device boxes 21 and 22, etc. are attached to the front side of the main container 1. All the members are covered with the cover container 60. As shown in FIG. 1, openable doors 61 and 62 are provided on the front surface of the cover container 60, and by opening these doors, it is possible to inspect and operate the equipment in the operation box 21 and 22. It is like this. The cover container 60 is provided so as to cover substantially the entire front surface of the device, and is designed so that when the device is viewed from the front side, the entire device pair looks like a rectangular parallelepiped shape.

A gas-insulated switchgear GIS is configured by the above-mentioned parts,
The main container 1 and the equipment housed in the main container constitute a power receiving side unit, and the first and second bus line side disconnector units 23 and 24 constitute a bus line side unit. When a plurality of gas-insulated switchgears GIS are installed at an electric station, a plurality of gas-insulated switchgears GIS (two in the illustrated example) are arranged side by side in the lateral direction as shown in FIG. Busbar conductors in the first and second busbar-side disconnector units of adjacent GISs are connected to each other. In this case, the busbar-side disconnector units are connected to each other by connecting the auxiliary containers of the adjacent gas-insulated switchgear to each other through the insulating spacers 31 supporting the busbar conductors. The spacing can be very small. Therefore, it is possible to configure a row board in which a plurality of gas-insulated switchgears are arranged close to each other, which not only simplifies the appearance and facilitates harmony with the surrounding environment but also contributes to improving the efficiency of equipment inspection. be able to.

The assembly of the apparatus of the above embodiment can be performed in the following order, for example. First, the instrument voltage transformer LPT is inserted and fixed in the main container 1 through the fifth opening 105 on the front surface side. Next, the circuit breaker CB supported by the support plate 112 is inserted into the main container 1 through the first opening 101, and the support plate 112 is attached to the first opening 101. Further, the device mounting plate 113 supporting the cross section DS2 is mounted in the fifth opening 105. Next, the opening 10 on the back side of the main container 1
2 to 104 are used as handholes to connect the circuit breaker CB and the disconnector DS2, and further connect the disconnector DS2 and the voltage transformer LPT for meters. Then, the preassembled second busbar side disconnector unit 24 is attached to the rear side opening 103 of the main container 1, and the opening 102 is used as a handhole to connect the second busbar side disconnector unit 24 and the circuit breaker CB. I do. Next, the first busbar-side disconnector unit 23 is attached to the opening 102 of the main container 2. Then the opening 10
4, the cable head unit 40 is attached, and further, each operation device box and the cover container 60 are attached, and the assembly of the apparatus is completed.

With the above configuration, when an accident occurs in the power receiving side unit (main container), the main container is disconnected from both the bus side disconnecting switch units without causing the power failure of the bus side disconnecting switch units 23 and 24. It can be pulled out forward, and inspection and repair inside the main container can be performed. Further, when a ground fault or the like occurs in the busbar-side disconnector unit, only the auxiliary container 25 can be separated from the insulating spacer 26 and the busbar-side disconnector unit can be inspected and repaired without opening the main container. .

By the way, when an OF cable or the like is used, the attachment of the cable head is usually performed when the cable manufacturer processes the end of the cable, and at the assembly site of the gas insulated switchgear, the assembler does not remove the cable head from the cable. Unacceptable. According to the above-mentioned embodiment, the cable head CH can be attached to the cable end after the cable head CH is attached to the cable end, so that the apparatus can be easily assembled even when the attachment / detachment of the cable head is not permitted as described above. It can be carried out. That is, OF
When a cable or the like is used, a lid plate 46 is attached to the cable head in advance when the cable head CH is attached and the cable head CH is attached, and after the tubular container 41 is attached to the main container 1, the cable head is attached. Attached lid plate 4
2 is attached to the open end of the tubular container 41.

In the above embodiment, the gas insulated switchgear having the double busbar configuration is taken as an example, but the present invention can be similarly applied to the gas insulated switchgear having the single busbar configuration. In the case of a single busbar structure, a busbar side disconnector unit is attached to one of the second and third openings 102 and 103.

EFFECTS OF THE INVENTION As described above, in the device of the present invention, the equipment on the power receiving side is attached to the main container, and the equipment on the bus bar side is attached to the main container in a gas-separated state. When an accident occurs, the side where no accident has occurred can continue driving, and it is possible to prevent the entire power failure state. Also, because the structure is removed by pulling out the circuit breaker upward, when the bolts that secure the circuit breaker are removed, the circuit breaker will not drop suddenly due to its own weight,
Work safety can be improved. Further, in the present invention, since the circuit breaker is arranged vertically with the circuit breaker facing downward, the insulating arc-extinguishing medium around the circuit breaker is arranged above and the operation mechanism part that does not generate heat quickly Can be moved to. Therefore, the convection of the insulating arc-extinguishing medium in the circuit breaker can be promoted to improve the heat dissipation from the circuit breaker.
It is possible to prevent the blocking performance from being lowered due to the temperature rise. Further, in the present invention, provided in the body of the main container,
Since the busbar side disconnector is attached to the second or third opening that opens in the horizontal direction via the insulating spacer, the insulating spacer is arranged vertically, so that dust is deposited on the spacer and the insulating performance is improved. Can be prevented from decreasing. Furthermore, since the strength of the main container is increased by forming the main container into a cylindrical shape, deformation of the container due to increase in internal pressure can be prevented, and a highly reliable device can be obtained.
Moreover, since the strength of the main container can be increased, the rated voltage can be increased by increasing the gas pressure in the main container.
Further, in the present invention, the main busbar has the second and third openings, and the busbar-side disconnector can be attached to any of these openings. Of course, there is an advantage that a switching circuit having a single busbar configuration can be configured by using one of the second and third openings.

[Brief description of drawings]

FIG. 1 is a front view showing the structure of an embodiment in which the present invention is applied to a switchgear having a double bus bar structure, and FIG. 2 is a top view of the same embodiment viewed from above with the right side surface of FIG. 1 as the front. FIG. 3 is a sectional view taken along the line III-III in FIG. 1, and FIG. 4 is a single line connection diagram showing the electrical configuration of each phase of the embodiment. DESCRIPTION OF SYMBOLS 1 ... Main container, 101-105 ... 1st-5th opening part, 23 ... 1st busbar side disconnector unit, 24 ... 2nd busbar side disconnector unit, 25 ... Auxiliary container, 26 ...
… Insulating spacer, 40… Cable head unit, 4
1 ... Tubular container, CB ... Circuit breaker, D11, DS12 ... Bus side disconnector, DS2 ... Line disconnector, CH ... Cable head, ES1 ... Grounding device, CT ... Current transformer, LP
T: Voltage transformer for instrument.

Claims (1)

[Claims] 1. A circuit breaker configured to house a circuit breaker and an operating mechanism for operating the circuit breaker in a housing, and at least one set of busbars electrically connected to one terminal of the circuit breaker. In a gas-insulated switchgear comprising a side disconnector and a cable head for drawing in a cable electrically connected to the other terminal of the cut-off portion, a gas-insulated switchgear having a first opening that opens upward is provided at the upper end. A substantially cylindrical main container having second to fourth openings, which are provided side by side in the horizontal direction and open in the horizontal direction, is provided in the body, and the circuit breaker is provided from the first opening of the main container. The shutoff portion is directed downward and is vertically inserted into the main container and supported by a support plate provided so as to hermetically close the first opening, and the at least one set of busbar side disconnectors is The uppermost part housed in the auxiliary container and provided in the body of the main container Attached to the first opening or a second opening provided below the first opening via an insulating spacer, and the cable head is provided at a fourth opening provided at the bottom. A gas-insulated switchgear characterized by being installed.