JP2003032818A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the installment size of an 1-1/2 circuit-breaker system gas- insulated switchgear, and to ensure a wide inspection passage. SOLUTION: A circuit-breaker is arranged in the central part of a tank which is in a single cylindrical shape and is arranged in the horizontal direction, and disconnectors are arranged on both sides of this circuit-breaker via insulating spacers respectively on the same axis with the circuit-breaker to form an switching unit. Three switching units of this constitution are arranged on a straight line. Bushing tanks are arranged between a space of each switching unit and in both ends of the switching units, and an air bushing is fitted to each bushing tank respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear of a substation system in which a main bus of a double busbar system is an overhead electric line and a switchgear part thereof is a 1-1 / 2 circuit breaker system. .

[0002]

2. Description of the Related Art A gas-insulated switchgear having a main bus of a double busbar system consisting of an overhead electrical line and a switchgear part having a 1-1 / 2 circuit breaker system is disclosed in, for example, JP-A-11-6.
There is one disclosed in Japanese Patent Publication No. 9532. FIG. 7 shows a single diagram of the configuration, and FIG. 8 shows a configuration example based on the single diagram of FIG. 8A is a plan view and FIG. 8B is a front view. In the figure, 1 is a circuit breaker, 2 is a disconnecting switch, 3 is an air bushing connected to a circuit such as a power transmission line or a transformer of an intermediate connection portion, 4 is an air bushing connected to an end main bus, 5
Is a current transformer arranged on both sides of the breaker 1, 6 is a zinc oxide type lightning arrester arranged in a part of the air bushing 3, 7 is a lightning arrester disconnecting switch, 8 is a grounding switch provided in each part, Reference numeral 9 is a voltage transformer provided in the air bushing 3.

As shown in FIG. 8, the conventional 1-1 / 2 circuit breaker system is configured such that three circuit breakers 1 are arranged at intervals on a straight line and the circuit breakers 1 are arranged at right angles to each other. Connect the current transformer 5, connect the disconnector 2 to each end of each current transformer 5, and arrange on a straight line parallel to the central axis of the circuit breaker 3.
A bushing tank 3T is provided between each of the disconnectors 2 connected to both ends of each circuit breaker 1 through a current transformer 5.
And bushing tanks 4T are arranged at both ends, an intermediate bushing tank 3T is an air bushing 3 connected to a transmission line or a transformer circuit, and an end bushing tank 4T is an air bushing connected to a main bus. 4 are vertically attached. The zinc oxide type lightning arrester 6 is attached to the bushing tank 3T to which the air bushing 3 is attached in a T-branch connection. The voltage transformer 9 is installed in a T-branch by providing a connecting bus 10 with the disconnector 2 beside the bushing tank 3T.

In the gas insulated switchgear of the 1-1 / 2 circuit breaker type constructed as described above, the three circuit breakers 1 and the six circuit breakers 2, the air bushings 3 and 4 are the current transformers 5. Sandwiching 2
Since they are arranged on the parallel straight lines of the book, the width W of the gas-insulated switchgear is large, and the inspection passage is in a converging state with many bends. Further, since the circuit breaker 1, the disconnector 2, the air bushings 3, 4 and the like are housed in separate tanks, the distance L1 between the heads of the air bushings 3, 4 is longer than the required insulation distance. The total length L of the gas insulated switchgear is long. In addition, since each device is housed in a separate tank, the number of tanks is large and the manufacturing cost is high.

[0005]

As described above, in the conventional 1-1 / 2 circuit breaker type gas insulated switchgear, the width W of each phase is wide and the separation distance L1 between the air bushings 3 and 4 is also large. It has become wide, the total length L is long, and the installation area is large. In addition, the circuit breaker 1, the disconnector 2, the air bushings 3, 4 and the like are housed in separate tanks and are arranged in a bent configuration, so that the manufacturing cost of the equipment is high and the inspection passage is a bent narrow passage. There was also a problem.

The present invention has been made to solve the above problems, and the total length as a gas-insulated switchgear can be obtained even if devices such as a circuit breaker, a disconnector, and an air bushing are arranged in a straight line. Short and inspection path can be formed in a straight line 1-
It is an object of the present invention to provide a 1/2 circuit breaker type gas insulated switchgear.

[0007]

A gas-insulated switchgear according to claim 1 of the present invention is a gas-insulated switchgear of the 1-1 / 2 circuit breaker type, which is formed into a single tubular shape and is horizontal. A circuit breaker is arranged in the central part of the tank arranged in the direction, and a disconnecting switch is arranged on the same axis as the circuit breaker via insulating spacers on both sides of this circuit breaker. The opening and closing units are arranged in a straight line, bushing tanks are arranged between the opening and closing units and at both ends of the opening and closing unit, and air bushings are attached to the bushing tanks.

A gas-insulated switchgear according to a second aspect of the present invention is a gas-insulated switchgear of the 1-1 / 2 circuit breaker type, which is formed in a single cylindrical shape and is arranged horizontally. A circuit breaker is arranged in the center, and a disconnecting switch is arranged on the same axis as the circuit breaker via insulating spacers on both sides of this circuit breaker to form a switchgear unit. The switchgear unit located in the center is provided with a bushing mounting seat above the end side electrode of each disconnector arranged on both sides of the circuit breaker. Is a configuration in which a bushing mounting seat is provided above the end side electrode of the end side disconnector in a state in which three switching units are connected, and an air bushing is mounted on each bushing mounting seat. .

A gas-insulated switchgear according to a third aspect of the present invention has a structure in which iron core type current transformers are arranged on the inner surfaces of both sides of the circuit breaker arranged in the tank of the first or second structure. It is what

A gas-insulated switchgear according to a fourth aspect of the present invention is an air-core coil type device provided on the inner surface of the tank adjacent to the insulating spacers on both sides of the circuit breaker arranged in the tank of the first or second aspect. The configuration is such that the air-core coil of the current transformer is arranged.

According to a fifth aspect of the present invention, there is provided a gas-insulated switchgear comprising: a connecting conductor connected to a lower portion of an air bushing attached to an intermediate connecting portion of the three opening / closing units according to the first to fourth aspects. The capacitor voltage divider of the capacitor voltage dividing type voltage transformer is arranged on the inner surface of the opposing tank.

A gas-insulated switchgear according to a sixth aspect of the present invention is a zinc oxide type switch having a T-branch to a connection conductor below the aerial bushing of the intermediate connection part of the tank of the first to fifth aspects. It is configured with a lightning arrester.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 is a single-line diagram of a 1-1 / 2 circuit breaker type switchgear according to Embodiment 1, and FIG. 2 is a configuration diagram of a gas-insulated switchgear according to Embodiment 1.
2A is a plan view and FIG. 2B is a front view. In the figure, 11 is a circuit breaker, 12 is a disconnecting switch, and 11T is a circuit breaker 11.
And a tank accommodating the disconnector 12, 13 is an air bushing connected to a circuit such as a power transmission line or a transformer at an intermediate connection portion, 13T is a bushing tank to which the air bushing 13 is attached, and 14 is an end portion. An air bushing connected to the main bus, 14T is a bushing tank to which the air bushing 14 is attached, 15 is an iron core type current transformer arranged on both sides of the circuit breaker 11, and 18 is a ground switch provided in each part. , 19 are insulating spacers. Reference numeral 20 denotes an opening / closing unit, which has a configuration in which a circuit breaker 11, two disconnecting switches 12 and an iron core current transformer 15 arranged on both sides of the circuit breaker 11 are housed inside a tank 11.

The tank 11T is formed in a single cylindrical shape, and openings 11a and 11b for assembling the circuit breaker 11 are provided in the lower central portion.
Also, an opening portion 11c for assembling the disconnector 12 is provided below the end portion, and both end portions are opened so that they can be connected.
Both sides of the bushing tank 13T are open, and a bushing mounting seat is provided on the upper portion of the bushing tank 13T so that the aerial bushing 13 can be mounted. The bushing tank 14T has an opening on one side, and a bushing attachment seat is provided on the upper portion of the bushing tank 14T so that the aerial bushing 14 can be attached.

In the opening / closing unit 20 having the structure shown in FIG. 2, the tank 11T is manufactured to have a size within the transportation limit even in the case of, for example, 500 kV or 1000 kV class, and the portion housed inside is normally assembled at the factory. Be shipped to the site. The assembling procedure is such that the tank 11T is arranged horizontally, the circuit breaker 11 is housed in the center thereof,
The disconnector 12 is arranged on the same axis as the circuit breaker 11 via insulating spacers 19 on both sides of the core breaker 11, and the core type current transformer 15 is loaded along the inner surface of the tank 11T on both sides of the circuit breaker 11 at both ends. The insulating spacer 19 is attached, and the circuit breaker 11 and the disconnector 12 on both sides thereof are assembled in a gas-separated state.

For assembly at the site, the opening / closing unit 20 and the bushing tank 1 were transported with the equipment housed inside.
The 3T and the bushing tank 14T are arranged on a straight line at a predetermined position, the tanks 11T, 13T, and 14T are connected, the air bushing 13 and the air bushing 14 are attached to perform internal assembly, and internal inspection is performed to check each part. Is filled with insulating gas to complete the assembly.

Thus, the circuit breaker 1 of the switching unit 20
One or two disconnectors 12 and an iron core current transformer 15 are housed in a tank 11T formed in a single tubular shape, and three opening / closing units 20 and an opening / closing unit 20 having this structure are provided.
Bushing tank 13T between, bushing 14 at the end
By arranging and connecting T in a straight line, the distance L1 between the air bushings 13 and between the air bushings 13 and the air bushings 14 is the same as the insulation distance required therebetween. Therefore, the total length L of the gas insulated switchgear is shortened, the width W of each phase is the thickness of the tank 11T, and since each phase is arranged in a straight line, the surrounding inspection passages are formed in a straight line. Can be set. In addition, since the circuit breaker 11, the disconnector 12 and the current transformer are housed in the same tank, the main parts are assembled in the factory, the number of tank connections on the site is small, and a gas-insulated switchgear with stable quality is provided. Become.

Embodiment 2. 3A and 3B are configuration diagrams of the gas-insulated switchgear according to Embodiment 2, FIG. 3A being a plan view and FIG. 3B being a front view. In the second embodiment, the circuit configuration is as shown in the single line diagram of FIG. 1, and the air bushing attachment portion is directly attached above the end portion of the tank that houses the circuit breaker 11 and the disconnector 12. In the figure,
The circuit breaker 11, the disconnector 12, the current transformer 15, and the air bushings 13, 14 are the same as those in the first embodiment.

23A and 23B are circuit breakers 11 and disconnectors 12.
And a tank that houses the iron core type current transformer 15,
A is a tank arranged in the central portion, and 23B is a tank arranged on the end side. Tank 2 located in the center
3A is formed in a single cylindrical shape and arranged horizontally, and has an opening 2 for assembling the circuit breaker 11 below the central portion.
3a, 23b and an opening 23c for assembling the disconnector 12 are provided below the ends, and both end faces are in an open state for assembling and connecting, and above the one electrode of each disconnector 12 at both ends. The bushing attachment seat 23d of the aerial bushing 13 is provided at this position. Like the tank 23A, the tank 23B arranged on the end side is formed in a single tubular shape and arranged horizontally, and has openings 23a, 23b for assembling the circuit breaker 11 below the central portion. And an opening 23c for assembling the disconnector 12 below the end,
Both end faces are opened for assembling and connecting, and the bushing mounting seat 23 of the air bushing 14 is located at a position above one electrode of the disconnector 12 on the end side when arranged.
d is provided. Reference numeral 24 is a connection tank for connecting the tank 23A and the tank 23B.

Numeral 30A is an opening / closing unit arranged in the central portion, and the circuit breaker 11 is arranged in the central portion of the tank 23A,
The disconnector 12 is arranged on the both sides thereof via the insulating spacers 19 in the same axial line as the circuit breaker 11, and the core type current transformer 15 is arranged along the inner surface of the tank 23A on both sides of the circuit breaker 11 at both ends. Is a structure in which an insulating spacer 19 is attached. Three
Reference numeral 0B denotes an opening / closing unit arranged on the end side, and like the opening / closing unit 30A arranged at the central portion, the tank 23B
A circuit breaker 11 is arranged in the center of the circuit breaker, and a disconnecting switch 12 is arranged on both sides of the circuit breaker 11 on the same axis as the circuit breaker 11 with insulating spacers 19 interposed therebetween. The current transformer 15 is arranged, and the insulating spacers 19 are attached to both ends. Open / close unit 30A, 3
The parts of the 0B circuit breaker 11 and the parts of the disconnector 12 on both sides thereof are assembled in a gas-divided state.

The opening / closing units 30A and 30B having the configuration shown in FIG.
Is 500 kV or 100 as in the first embodiment.
Even in the case of 0 kV class, the tanks 23A and 23B are manufactured to have dimensions within the transportation limit, and the parts housed inside are usually assembled in a factory and transported to the site.

For on-site assembly, the opening / closing units 30A and 30b, which accommodate the equipment inside and are transported, are arranged on a straight line at predetermined positions, and the tanks 23B, 23A and 23B are arranged in this order, and the air bushing is arranged. 13 and air bushing 14
After mounting, the internal assembly is performed, the internal inspection is performed, each part is filled with insulating gas, and the assembly is completed.

Thus, the opening / closing units 30A and 30
B has a configuration in which the circuit breaker 11, the two disconnecting switches 12 and the iron core type current transformer 15 are housed in a tank 11T formed in a single cylindrical shape, and three opening / closing units 30A, 30 of this configuration are provided.
By arranging B on a straight line and connecting it,
Between the air bushings 13 and between the air bushings 13
The distance L1 between the air bushing 14 and the air bushing 14 is about the same as the insulation distance required therebetween, and the overall length L as a gas insulation switchgear is shortened, and the width W of each phase is the thickness of the tanks 23A and 23B. And, since each phase is arranged on a straight line, the surrounding inspection passage can be set on a straight line. With this configuration, the number of tanks is smaller than in the case of the first embodiment, the main parts are assembled in the factory, the number of tank connections on site is small, and the gas-insulated switchgear with more stable quality is provided. become.

Embodiment 3. 4A and 4B are configuration diagrams of a gas-insulated switchgear according to Embodiment 3, FIG. 4A is a plan view, and FIG. 4B is a front view. The circuit configuration is the same as the single line diagram of FIG. 1 of the first embodiment, and the iron core type current transformer of the second embodiment detects the voltage proportional to the current by the air-core coil, and the secondary load capacity by the amplifier. The configuration is an air-core coil type current transformer for compensation. In the figure, a circuit breaker 11,
The disconnector 12 and the air bushings 13 and 14 are the same as those in the first embodiment. The connection tank 24 is shown in FIG.
Is the same as Reference numeral 35 is an air-core coil of an air-core coil type current transformer arranged on both sides of the circuit breaker 11.

33A and 33B are circuit breakers 11 and disconnectors 12.
And a tank for containing the air-cored coil 35, 33A
Is a tank arranged in the central portion, and 33B is a tank arranged on the end side. Tank 33 arranged in the center
Similarly to the tank 23A of the second embodiment, A has a configuration in which it is formed in a single cylindrical shape and arranged horizontally, and openings 33a, 33b and ends for assembling the circuit breaker 11 are provided below the central portion. An opening 33c for assembling the disconnector 12 is provided below the ends of the disconnector 12, and both end faces are opened for assembly and connection, and air is placed at a position above one electrode of each disconnector 12 at both ends. Bushing mounting seat 3 of bushing 13
3d is provided. The tank 33B arranged on the end side is
Similar to 33A, it is formed into a single tubular shape and arranged horizontally, and the openings 33a and 33b for assembling the circuit breaker 11 at the lower center and the disconnector 12 at the lower end are assembled. Is provided for opening and assembling and connecting both ends, and the bushing of the air bushing 14 is attached to a position above one electrode of the disconnector 12 on the end side when the air bushing 14 is assembled. A seat 33d is provided.

Reference numeral 40A denotes an opening / closing unit arranged in the central portion, and the circuit breaker 11 is arranged in the central portion of the tank 33A.
The disconnector 12 is arranged on the both sides of the same with the circuit breaker 11 via the insulating spacers 19, and the core type current transformer 15 is arranged along the inner surface of the tank 23A on both sides of the circuit breaker 11. 40B is an opening / closing unit arranged on the end side, and like the opening / closing unit 40A arranged at the center,
The circuit breaker 11 is arranged in the central portion of the tank 33B, and the disconnector 12 is arranged on both sides of the circuit breaker 11 on the same axis as the circuit breaker 11 via insulating spacers 19.
The air-core type current transformer air-core coil 35 is arranged along the inner surface of the circuit, and insulating spacers 19 are attached to both ends of the circuit breaker 11. The breaker 11 and the disconnector 12 on both sides thereof are gas-divided. Assemble in the closed state.

The opening / closing units 40A and 40B having the structure shown in FIG.
Is 500 kV or 100 as in the second embodiment.
Even in the case of 0 kV class, the tanks 33A and 33B are manufactured to have dimensions within the transportation limit, and normally the parts accommodated inside are assembled at the factory and transported to the site.

For the on-site assembly, the opening / closing units 40A and 40B, which accommodate the equipment inside and are transported, are arranged on a straight line at a predetermined position, and the air bushing 13 and the air bushing 14 are attached to perform the internal assembly. Perform internal inspection, fill each part with insulating gas, and complete assembly.

Thus, the opening / closing units 40A and 40
B is different from the configuration of the second embodiment in that the current transformer is an air-core coil type current transformer, and the air-core coil arranged in the tank has a small accommodation space, and the air bushings 13, 14 are provided.
The separation distance can be set according to the required insulation distance. Therefore, the length L of the tanks 33A and 33B can be set in the second embodiment.
It is shorter than the case of FIG. Therefore, the width W of each phase is the thickness of the tanks 33A and 33B, and since each phase is arranged in a straight line, the surrounding inspection passage can be set in a straight line as in the second embodiment. Is.
Further, in this configuration, since the current transformer is formed in the air-core coil type, the total length L can be made shorter than in the first and second embodiments, and the degree of freedom in layout design is increased.

Fourth Embodiment 5 is a single line diagram of the fourth embodiment, FIG. 6 is a configuration diagram of the gas insulated switchgear of the fourth embodiment, FIG. 6 (a) is a plan view, FIG. 6 (b) is a front view, and FIG.
(C) is a side view. The circuit configuration is a configuration in which a lightning arrester and a voltage transformer are added to the air bushing portion connected to the transmission line or the transformer circuit of the single diagram of the first embodiment, and the current transformer is an air-core coil type current transformer. . In the figure, the circuit breaker 11, the disconnector 12, the air bushings 13, 14 are
This is the same as in the first embodiment. The connection tank 24 is the same as that of the second embodiment shown in FIG. The air-core coil 35 is the same as in the third embodiment.

43A and 43B are circuit breakers 11 and disconnectors 12
And a tank for accommodating the air-core coil 35, 43A
Is a tank arranged in the central portion, and 43B is a tank arranged on the end side. Tank 43 arranged in the center
Similarly to the tank 33A of the third embodiment, A has a configuration in which it is formed in a single cylindrical shape and arranged horizontally, and openings 43a, 43b and ends for assembling the circuit breaker 11 are provided below the central portion. An opening 43c for assembling the disconnector 12 is provided at the lower part of the section, both end faces are opened for assembling and connecting, and air is placed at a position above one electrode of each disconnector 12 at both ends. Bushing mounting seat 4 of bushing 13
3d is provided. The bushing mounting seat 43d of the air bushing 13 is a slightly higher mounting seat so that a zinc oxide type arrester can be branched and connected. Like the tank 43B, the tank 43B arranged on the end side is formed in a single tubular shape and arranged horizontally, and has openings 43a, 43b for assembling the circuit breaker 11 below the central portion thereof. An opening 43c for assembling the disconnector 12 is provided below the end portion, and both end faces are in an open state for assembling and connecting, and above one electrode of the disconnector 12 on the end side when arranged. The configuration is such that the bushing attachment seat 43d of the aerial bushing 14 is provided at this position, which is the same as the tank 33B of the third embodiment.

Reference numeral 50A is an opening / closing unit arranged in the central portion, and the circuit breaker 11 is arranged in the central portion of the tank 43A.
The disconnector 12 is arranged on both sides of the same through the insulating spacers 19 in the same axis as the circuit breaker 11, and the air-core coil 35 of the air-core current transformer is arranged on the inner surface of the tank 43A on both sides of the circuit breaker 11. . Reference numeral 50B denotes an opening / closing unit arranged on the end side, which is the same as the opening / closing unit 40B of the third embodiment. Reference numeral 46 is a capacitor voltage divider of a capacitor voltage dividing type voltage transformer which is arranged so as to face the connection conductor under the air bushing 13, and 47 is a zinc oxide type lightning arrester connected by branching from the bottom of the air bushing 13 into a T branch. Is.

The opening / closing units 50A and 50B having the configuration shown in FIG.
Is 500 kV or 100 as in the second embodiment.
Even in the case of the 0 kV class, the tanks 43A and 43B are manufactured to have dimensions within the transportation limit, and normally the parts accommodated inside are assembled in a factory and transported to the site.

For on-site assembly, the opening / closing units 50A and 50b, which accommodate the equipment inside and are transported, are arranged on a straight line at a predetermined position, and the tanks 43B, 43A and 43B are arranged in this order, and the air bushing is arranged. 13 and air bushing 14
After mounting, the internal assembly is performed, the internal inspection is performed, each part is filled with insulating gas, and the installation is completed.

Thus, the opening / closing units 50A and 50
B is the same as that of the third embodiment except that a zinc oxide type arrester 47 is added to the configuration of the third embodiment, and like the third embodiment, the current transformer is used as an air-core type current transformer in the tank. Since the accommodation space is small in the configuration in which the air-core coil is arranged, the separation distance between the air bushings 13 and 14 can be set to a required insulation distance, and the capacitor voltage divider 46 and the zinc oxide type arrester 47 are added. Also, the lengths L of the tanks 43A and 43B are short as in the third embodiment. Unlike the first to third embodiments, the portion of the lightning arrester 47 projects laterally so that it is not a linear inspection passage, but the inspection place is wide.

The voltage dividing capacitor 46 and the zinc oxide type arrester 47 of the capacitor voltage dividing type voltage transformer are the same as those in the first embodiment.
Even if it applies to the cases of 3 to 3, it becomes a structure including a lightning arrester and a capacitor voltage dividing type voltage transformer.

[0037]

In the gas insulated switchgear according to claim 1 of the present invention, the configuration of the gas insulated switchgear of the 1-1 / 2 circuit breaker system is formed in a single cylinder and arranged horizontally. A circuit breaker is arranged in the center of the tank, and a disconnector is arranged on both sides of this circuit breaker via insulating spacers on the same axis as the circuit breaker. Place it on the top, and place the bushing tank between each opening and closing unit and at both ends of the opening and closing unit,
Since the air bushings are attached to the bushing tanks respectively, the distance between the air bushings is about the same as the required insulation distance therebetween, and the total length L of the gas insulated switchgear is short. The surrounding inspection passage can be set in a straight line, the main parts are assembled in the factory,
It is possible to construct a gas-insulated switchgear with stable quality because there are few tank connections on site.

A gas-insulated switchgear according to a second aspect of the present invention is a gas-insulated switchgear of the 1-1 / 2 circuit breaker type, which is constructed as a single cylinder and is arranged horizontally. A circuit breaker is arranged in the center, and a disconnecting switch is arranged on the same axis as the circuit breaker via insulating spacers on both sides of this circuit breaker to form a switching unit. The switchgear unit located in the center is provided with a bushing mounting seat above the end side electrode of each disconnector arranged on both sides of the circuit breaker. Since the configuration is such that the bushing attachment seats are provided above the end side electrodes of the end side disconnectors with the three opening / closing units connected, and the air bushings are attached to the respective bushing attachment seats, Item 1 The overall length is shorter than the case, the periphery of the inspection passage can be set linearly, becoming more fewer tank, the connecting portion is small in the tank on site, it can be constructed quality and more stable gas-insulated switchgear.

In the gas-insulated switchgear according to claim 3 of the present invention, the core type current transformer is arranged along the inner surface of each of the tanks on both sides of the circuit breaker arranged in the tank of the construction of claim 1 or 2. With this configuration, by accommodating the current transformer inside the circuit breaker, the space for disposing the current transformer is not required.

A gas-insulated switchgear according to a fourth aspect of the present invention is an air-core coil-type device provided on the inner surface of the tank adjacent to the insulating spacers on both sides of the circuit breaker arranged in the tank of the first or second aspect. Since the air-core coil of the current transformer is arranged, the current transformer is accommodated without enlarging the tank of the accommodating portion of the circuit breaker.

The gas-insulated switchgear according to claim 5 of the present invention has a connection conductor connected to the lower portion of the air bushing attached to the intermediate connection part of the three switchgear units having the configurations of claims 1 to 4. Since the capacitor voltage divider of the capacitor voltage dividing type voltage transformer is arranged on the inner surface of the facing tank, the voltage transformer is provided without increasing the dimensions of the circuit breaker and the disconnector.

According to a sixth aspect of the present invention, there is provided a gas-insulated switchgear having a zinc oxide type, which is T-branched to a connecting conductor below an aerial bushing of an intermediate connecting portion of a tank having the structure according to the first to fifth aspects. Since the lightning arrester is provided, the zinc oxide type lightning arrester is provided without enlarging the accommodation portion of the circuit breaker and the disconnector.

[Brief description of drawings]

FIG. 1 is a single line diagram of a 1-1 / 2 circuit breaker system according to a first embodiment.

FIG. 2 is a configuration diagram of a gas-insulated switchgear according to the first embodiment.

FIG. 3 is a configuration diagram of a gas-insulated switchgear according to a second embodiment.

FIG. 4 is a configuration diagram of a gas-insulated switchgear according to a third embodiment.

FIG. 5 is a single line diagram of a 1-1 / 2 circuit breaker system according to a fourth embodiment.

FIG. 6 is a configuration diagram of a gas-insulated switchgear according to a fourth embodiment.

FIG. 7 is a single line diagram of a conventional 1-1 / 2 circuit breaker system.

FIG. 8 is a block diagram of a conventional 1-1 / 2 circuit breaker type gas insulated switchgear.

[Explanation of symbols]

11 circuit breaker, 11T tank, 12 disconnector, 13
Air bushing, 13T bushing tank, 14 Air bushing, 14T bushing tank, 15 Iron core current transformer, 18 Ground switch, 19 Insulating spacer, 2
0 open / close unit, 23A, 23B tank, 24 connection tank, 33A, 33B tank, 35 air core coil, 40A, 40B open / close unit, 43A, 43B
Tank, 46 condenser voltage divider, 47 zinc oxide type arrester.

Claims (6)

[Claims] 1. A circuit breaker and a disconnecting switch are arranged on both sides of the circuit breaker to form an opening / closing unit. Three opening / closing units of this structure are connected in series, and an air bushing is provided at a connecting portion and both ends of the opening / closing unit. In the installed gas insulated switchgear of the 1-1 / 2 circuit breaker type, the switchgear comprises a single cylinder, and a circuit breaker arranged in the center of a horizontally arranged tank. The circuit breaker is arranged on both sides of the circuit breaker via insulating spacers on the same axis as the circuit breaker, and the three opening / closing units of this structure are arranged on a straight line between the opening / closing units and between the opening / closing units. A gas-insulated switchgear, characterized in that bushing tanks are arranged and connected to both ends of the unit, and air bushings are attached to each bushing tank. 2. A circuit breaker and disconnectors on both sides of the circuit breaker are arranged to form an opening / closing unit. Three opening / closing units of this structure are connected in series, and an air bushing is provided at a connecting portion and both ends of the opening / closing unit. In the installed gas insulated switchgear of the 1-1 / 2 circuit breaker type, the switchgear comprises a single cylinder, and a circuit breaker arranged in the center of a horizontally arranged tank. The circuit breakers are arranged on both sides of the circuit breaker via insulating spacers on the same axis as the circuit breaker. The three switching units of this structure are arranged on a straight line and arranged at the center. The unit is provided with bushing mounting seats above the end side electrodes of the respective disconnecting switches arranged on both sides of the circuit breaker, and the respective switching units on both sides are the end side disconnecting circuits arranged on both sides of the circuit breaker. A gas-insulated switchgear, characterized in that bushing attachment seats are provided above the end electrodes of the container, and air bushings are attached to each bushing attachment seat. 3. The gas insulated switchgear according to claim 1 or 2, wherein iron core type current transformers are arranged on the inner surfaces of the tank on both sides of the circuit breaker arranged in the tank. 4. The air-core coil of an air-core coil type current transformer is arranged on the inner surface of the tank adjacent to the insulating spacers on both sides of the circuit breaker arranged in the tank. Item 2. A gas-insulated switchgear according to item 2. 5. The capacitor voltage divider of the capacitor voltage divider type voltage transformer is arranged on the inner surface of the tank facing the connection conductor connected to the lower part of the air bushing of the intermediate connection portion of the three switching units. The gas insulated switchgear according to any one of claims 1 to 4. 6. A zinc oxide lightning arrester is provided, which is T-branched from a connecting conductor in the lower part of the air bushing in the middle part of the connected tank. Gas-insulated switchgear according to.