JP2007319000A - Compound-type gas-insulated switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compound type gas-insulated switchgear, in which the number of tanks is decreased, turning miniaturization and turning reduction in cost can be realized, additional new construction of an electric station and site installation workload in the extension work can be decreased, and an installation term can be shortened. <P>SOLUTION: The compound type gas-insulated switchgear has arranged two standard units TB2 with the setting length of the standard unit TB0 apart for conforming the shaft center of a tank 20 to be aligned substantially in a single row, with a bushing 24 of the standard unit TB2 mutually connected by an overhead electric line 31 so as to constitute the electric circuit of single-line diagram units. In the standard unit TB2 has arranged a breaker 21 and disconnecting switches 22, 23 in a substantially linear shape, stored in the tank 20 with the disconnecting switches 22, 23 positioned at both sides of the breaker 21, a grounding switch 25 is connected between the breaker 21 and the disconnecting switches 22, 23. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention constitutes a single-line diagram unit by arranging and connecting in series units that collectively house a circuit breaker, a disconnect switch, a ground switch, etc. in a gas compartment in a single tank. The present invention relates to a composite gas insulated switchgear.

  For example, Patent Document 1 discloses a gas-insulated switchgear of a 1-1 / 2 circuit breaker that constitutes a switchgear part of a substation facility in which a power transmission line and a bus are overhead lines.

FIG. 13 is a diagram for explaining the configuration of a conventional gas-insulated switchgear of the 1-1 / 2 circuit breaker method (hereinafter referred to as CB method) described in Patent Document 1, for example, (a) of FIG. FIG. 13 (b) shows a plan view, and FIG. 13 (b) shows a front view thereof.
In FIG. 13, three circuit breakers 1 are arranged in a straight line, current transformers 10 are connected to both ends of each circuit breaker 1, and disconnect switch 9 and inspection ground switch 8 are connected to each current transformer 10. Has been. A line side bushing case 11 is disposed between the disconnectors 9, and a line side bushing 2 connected to a circuit such as a power transmission line or a transformer is attached to each line side bushing case 11. A bus-side bushing case 12 is disposed outside the disconnectors 9 on both sides, and a bus-side bushing 3 connected to the main bus is attached to each bus-side bushing case 12. Moreover, the line side earthing switch 6 is connected between the line side bushing 2 and the disconnector 9, the lightning arrester 4 and the lightning arrester disconnector 5 are connected to the line side bushing 2, and the busbar side grounding switch 7 is connected to the busbar bushing. It is connected to the 3 side. Further, a connection bus 13 is added to one between the line side bushing case 11 and the circuit breaker 1, and a gas insulated instrument transformer 14 is provided below the connection bus 13.

  As described above, the conventional gas insulated switchgear constitutes an electric circuit in units of single-line connection diagrams by combining electric devices such as the circuit breaker 1, the disconnecting switch 9, and the grounding switches 6, 7, 8 and the like. And each electric equipment, such as the circuit breaker 1, the disconnecting switch 9, and the earthing switches 6, 7, 8, etc., is disposed in a single tank, and an insulating space is provided between the tanks.

JP-A-11-69532

Since the conventional gas insulated switchgear is configured as described above, the number of tanks for storing electrical equipment increases, and insulation spacers are provided between the tanks, making it impossible to achieve downsizing and cost reduction. was there.
In addition, when newly establishing or adding an electrical station such as a substation or power plant, a tank containing the circuit breaker 1, the disconnector 9, and each earthing switch is brought into the field, and the distance between each electrical device Since the tanks are placed and connected to the site so that sufficient protection can be obtained, and the line side and bus side bushings are installed, the installation area is expanded, the amount of installation work is increased, and the installation period is prolonged. There was also a problem.

  The present invention has been made to solve the above-described problems. A plurality of electrical devices are collectively stored in a single tank to form a unit, and a plurality of units are arranged and connected in series to form a single-line connection diagram. By configuring the unit's electrical circuit and reducing the number of tanks that store electrical equipment, it is possible to reduce the size and price, and reduce the amount of on-site installation work in the construction and expansion of electrical stations. An object is to obtain a composite gas insulated switchgear capable of shortening the installation period.

  A composite gas insulated switchgear according to the present invention is provided in a cylindrical tank arranged with its axial direction substantially horizontal, and disposed in the tank with its opening / closing operation direction substantially coinciding with the axial direction of the tank. Circuit breaker, a disconnector disposed on both sides of the circuit breaker in the tank, and electrically connected to the circuit breaker, and electrically connected between the circuit breaker and the disconnector A plurality of units filled with electric insulating gas filled in the tank, and the plurality of units are arranged in a line with the axial centers of the tanks substantially aligned, In addition, they are electrically connected to each other to constitute a single-line diagram unit. And at least one set of the adjacent units of the plurality of units is arranged with the lengths of the units separated, and the bushings are arranged with the units of the units separated in length. An overhead electric wire path provided between the opposing disconnectors of the pair of units arranged in a separated manner in the length of the unit, provided above the opposing disconnectors of the tank. It is electrically connected via.

According to the present invention, the plurality of units are arranged in a line with the axial centers of the tanks substantially coincided with each other and are electrically connected to each other to form a single-line diagram unit, thereby reducing the number of tanks. As a result, downsizing and cost reduction can be realized, and the amount of on-site installation work in the construction and expansion of electric stations can be reduced, and the installation period can be shortened.
In addition, since at least one set of adjacent units of a plurality of units is arranged with the lengths of the units separated, when adding units, the extension units are arranged with the unit lengths separated. It is only necessary to insert them between existing units and electrically connect them to each other.
Further, a pair of bushings is provided on the upper side of the disconnecting device opposite to each tank of each of the units of the set in which the units are separated in length, and the units are separated in length. Since the above-mentioned disconnecting switch of the above unit is electrically connected via the overhead wireway spanned by the both bushings, when adding the unit, remove the overhead wireway and install the extension unit. It is only necessary to insert between the units and electrically connect to each other, and the unit expansion work is simplified.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 and 2 are cross-sectional views showing standard units TB2 and TB11 constituting a composite gas insulated switchgear according to Embodiment 1 of the present invention, respectively, and FIG. 3 is 1-1 according to Embodiment 1 of the present invention. FIG. 4 is an apparatus configuration diagram of the composite gas insulated switchgear constituting the 1/1/2 CB single-line diagram unit according to Embodiment 1 of the present invention. It is.

As shown in FIG. 1, the standard unit TB <b> 2 is configured by storing electrical devices such as a circuit breaker 21, first and second disconnectors 22 and 23, and a ground switch 25 in a single tank 20. Yes.
The tank 20 is made of iron, is formed in a straight cylindrical shape, and is arranged with its axis substantially horizontal. The tank 20 has end flanges 20a attached to both ends thereof to be hermetically sealed. The tank 20 is defined by three conical insulating spacers 28 into three gas compartments 33a, 33b, and 33c. Is sealed at a predetermined pressure in each gas compartment 33a, 33b, 33c. The branch pipe portion 20b is provided in the tank 20 so as to face the left and right gas compartments 33a, 33c, and the hand hole 20c is provided in the tank 20 so as to face the central gas compartment 33b. A bushing 24 is attached to each of the branch pipe portions 20 b of the tank 20.

  The circuit breaker 21 includes an arc extinguishing chamber 21E, a conductor 21a, a mechanism portion 21b, a support insulating cylinder 21c, an operation device 21d, and the like. The circuit breaker 21 is supported by the tank 20 by a support insulating cylinder 21c, and is disposed in the gas compartment 33b in the center of the tank 20 so that the opening / closing operation direction of the arc extinguishing chamber 21E is substantially coincident with the axial direction of the tank 20. Has been. Further, the conductor 21a on the arc extinguishing chamber 21E side and the conductor 21a on the mechanism part 21b side are supported by the conical insulating spacers 28, respectively.

The first disconnector 22 includes a movable contact portion 22a and a fixed contact portion 22b. The opening / closing direction of the first disconnector 22 is substantially aligned with the axial direction of the tank 20, and the pole on the movable contact portion 22a side is connected to the conductor 21a. The tank 20 is connected to the gas compartments 33a and 33c on the left and right sides of the tank 20 in FIG. The circuit breaker 21 and the first disconnector 22 are arranged in a substantially straight line in the tank 20.
The second disconnector 23 includes a movable contact portion 23a and a fixed contact portion 23b. The open / close direction of the second disconnector 23 is a direction perpendicular to the axial direction of the tank 20 (the vertical direction in FIG. 1). The poles on the side are connected to the poles on the fixed contact 22b side of the first disconnector 22 and are disposed in the gas compartments 33a and 33c on the left and right sides of the tank 20 in FIG. The second disconnector 23 is located below the branch pipe portion 20 b, and the poles on the side of the fixed contact portions 23 b are respectively connected to the conductors 24 a of the bushing 24.

  The poles on the movable contact portions 22a, 23a side of the first and second disconnectors 22, 23 also serve as fixed contact portions of the ground switch 25, respectively. And so that the earthing | grounding switch 25 can contact the movable contact part (not shown) to the pole of the 1st and 2nd disconnectors 22 and 23 at the side of the movable contact part 22a, 23a side, It is arranged. Current transformers 26 are provided on both sides of the arc extinguishing chamber 21 </ b> E in the tank 20. Furthermore, the voltage transformer 27 is connected to the pole on the fixed contact portion 23b side of the second disconnector 23 and is disposed in the tank 20 so that the line voltage can be measured.

Further, as shown in FIG. 2, the standard unit TB11 is configured such that electric devices such as the circuit breaker 21, the first and second disconnectors 22, 23, and the ground switch 25 are housed in a single tank 20A. Has been.
The tank 20A is made of iron, is formed in a straight cylindrical shape, and is arranged with its axis substantially horizontal. The tank 20A has end flanges 20a attached to both ends thereof to be hermetically sealed. The tank 20A is divided into three gas compartments 33a, 33b, and 33c by a conical insulating spacer 28. Is sealed at a predetermined pressure in each gas compartment 33a, 33b, 33c. The branch pipe portion 20b is provided in the tank 20A so as to face the left gas compartment 33a, and the hand hole 20c is provided in the tank 20A so as to face the central gas compartment 33b. A bushing 24 is attached to the branch pipe portion 20b of the tank 20A.

The circuit breaker 21 is supported by the tank 20A by the support insulating cylinder 21c, and the opening / closing operation direction of the arc extinguishing chamber 21E is substantially aligned with the axial direction of the tank 20A, and is disposed in the gas compartment 33b in the center of the tank 20A. It is installed. The conductor 21a on the arc extinguishing chamber 21E side and the conductor 21a on the mechanism portion 21b side are supported by the conical insulating spacers 28, respectively.
Further, the first disconnector 22 has its opening / closing direction substantially coincided with the axial direction of the tank 20A, the pole on the movable contact portion 22a side is connected to the conductor 21a, and the gas compartment on the right side of the tank 20A in FIG. 33c. Further, the second disconnector 23 has its opening / closing direction as a direction (vertical direction in FIG. 2) perpendicular to the axial direction of the tank 20A, and the pole on the movable contactor portion 23a side is connected to the conductor 21a. 2 is disposed in the gas compartment 33a on the left side of FIG. The second disconnector 23 is located below the branch pipe portion 20 b, and the pole on the fixed contact portion 23 b side is connected to the conductor 24 a of the bushing 24.

  The poles on the movable contact portions 22a, 23a side of the first and second disconnectors 22, 23 also serve as fixed contact portions of the ground switch 25, respectively. And so that the earthing | grounding switch 25 can contact the movable contact part (not shown) to the pole of the 1st and 2nd disconnectors 22 and 23 at the side of the movable contact part 22a, 23a side, It is arranged. Current transformers 26 are provided on both sides of the arc extinguishing chamber 21E in the tank 20A.

  In the first embodiment, one standard unit TB2 and two standard units each including a single tank 20, 20A together with electric devices such as the circuit breaker 21, the disconnectors 22, 23, and the switching device 25 are respectively stored. Units TB11 are installed in a line in series on the premises and electrically connected to each other, and the phase-separated 1-1 / 2CB system single-line connection diagram unit (hereinafter referred to as bay) shown in FIGS. The combined gas insulated switchgear constituting the electric circuit of FIG.

Next, the installation work of the composite gas insulated switchgear according to Embodiment 1 will be described.
First, the standard units TB11 and TB2 and the bushing 24 are assembled at the factory and carried into the site. At this time, the bushing 24 is not attached to the standard units TB11 and TB2, and the opening of each branch pipe part 20b is closed with a lid plate (not shown).
Then, the standard unit TB2 is installed at a predetermined position on the site, and the standard unit TB11 is installed in a row on the site so as to be positioned on both sides of the standard unit TB2 with the axes of the tanks 20 and 20A being substantially aligned.
Next, the opposing end flanges 20a of the standard units TB11 and TB2 are removed, and the poles on the fixed contact portion 22a side of the opposing first disconnector 22 of the standard units TB11 and TB2 are connected by a conductor 32. And each cover plate is removed and each bushing 24 is attached to each branch pipe part 20b. Further, the pole on the fixed contact portion 23b side of each second disconnector 23 of the standard units TB11 and TB2 and the conductor 24a of the bushing 24 are connected to each other. Furthermore, the standard units TB11 and TB2 are connected by the bellows 29, respectively. Thereafter, sulfur hexafluoride gas is filled and sealed in the gas compartments 33a, 33b and 33c of the tanks 20 and 20A.

  In this way, the installation of the composite gas insulated switchgear constituting the electrical circuit of the 1-1 / 2CB bay shown in FIGS. 3 and 4 is completed. Then, for example, a three-phase composite gas insulated switchgear is installed in the premises, and a track in an electric station such as a substation or a power plant is configured. Further, the composite gas insulated switchgear is connected to the main bus, the overhead electric line, the transformer, and the like via the bushing 24, and constitutes a desired electric circuit of the electric station.

  According to the first embodiment, one standard unit TB2 in which electrical devices such as the circuit breaker 21, the disconnecting devices 22 and 23, and the ground switch 25 are collectively stored in a single tank 20 and 20A, and Two standard units TB11 are installed in a line in series, and are electrically connected to each other to constitute a composite gas insulated switchgear that constitutes an electrical circuit of a 1-1 / 2CB bay. Therefore, the number of tanks to be used is significantly reduced compared to the case where the circuit breakers, disconnectors, switchgears, etc. are individually stored in tanks, and the insulating spacers provided between the tanks are no longer necessary. The size and cost can be reduced, and the installation area can be saved by reducing the number of connection points between tanks. Moreover, since the diameter of each tank 20 and 20A can be comprised equally, the connection between tanks becomes easy.

In addition, when building or adding an electrical plant, the standard units assembled at the factory are brought into the site, and the standard units are placed and connected to the site, reducing the amount of installation work at the site and reducing the installation period. Shortening is achieved.
Moreover, since the voltage transformer 27 is disposed in the tanks 20 and 20A, an air-insulated voltage transformer for measuring the voltage of the line can be omitted.

  Each tank 20, 20A is divided into three gas compartments 33a, 33b, 33c. For example, when checking the breaker 21 of the standard unit TB2, the second disconnector 23 in the gas compartments 33a and 33c on both sides of the tank 20 of the standard unit TB2 is opened and the gas compartments 33a and 33c are opened. After the sulfur hexafluoride gas is removed from the circuit and the circuit breaker 21 is electrically insulated from the system, the operator enters the tank 20 through the hand hole 20c and checks the circuit breaker 21. Therefore, the circuit breaker 21 can be inspected without turning off the system power. That is, the target device can be inspected with extremely reduced power outage area of the system.

  Also, a composite gas insulated switchgear in which one standard unit TB2 and two standard units TB11 are installed in a line in series and electrically connected to each other to form an electrical circuit of a 1-1 / 2 CB system bay Therefore, the units can be connected not by the bushing but by the gas insulating bus (bellows 29 and conductor 32), and the installation area can be saved.

Embodiment 2. FIG.
In the first embodiment, the present invention is applied to a 1-1 / 2 CB bay. In the second embodiment, the present invention is applied to a 1-1 / 3 CB bay. .
FIG. 5 is a cross-sectional view showing a standard unit TB12 constituting a composite gas insulated switchgear according to Embodiment 2 of the present invention, and FIG. 6 is a 1/3 CB single line connection according to Embodiment 2 of the present invention. FIG. 7 is an equipment configuration diagram of a composite gas insulated switchgear constituting a 1-1 / 3 CB single-line diagram unit according to Embodiment 2 of the present invention.

As shown in FIG. 5, the standard unit TB12 is configured such that electric devices such as the circuit breaker 21, the first and second disconnectors 22 and 23, and the ground switch 25 are accommodated in a single tank 20 </ b> B. Yes.
The tank 20B is made of iron, is formed in a straight cylindrical shape, and is arranged with its axis substantially horizontal. The tank 20B has end flanges 20a attached to both ends thereof, hermetically sealed, and defined by conical insulating spacers 28 into three gas compartments 33a, 33b, 33c, and sulfur hexafluoride gas, which is an electrically insulating gas. Is sealed at a predetermined pressure in each gas compartment 33a, 33b, 33c. The branch pipe portion 20b is provided in the tank 20B so as to face the left gas compartment 33a, and the hand hole 20c is provided in the tank 20B so as to face the central gas compartment 33b. A bushing 24 is attached to the branch pipe portion 20b of the tank 20B.

Then, the circuit breaker 21 is supported by the tank 20B by the supporting insulating cylinder 21c, and the opening / closing operation direction of the arc extinguishing chamber 21E is substantially aligned with the axial direction of the tank 20B, and is arranged in the central gas compartment 33b of the tank 20B. It is installed. The conductor 21a on the arc extinguishing chamber 21E side and the conductor 21a on the mechanism portion 21b side are supported by the conical insulating spacers 28, respectively.
Further, the first disconnector 22 has its opening / closing direction substantially coincided with the axial direction of the tank 20B, and the pole on the movable contact portion 22a side is connected to the conductor 21a. Arranged in the compartments 33a and 33c, respectively. Further, the second disconnector 23 has the opening / closing direction as a direction (vertical direction in FIG. 5) orthogonal to the axial direction of the tank 20B, and the pole on the movable contactor portion 23a side is the fixed contactor of the first disconnector 22. It is connected to the pole on the part 22b side and is disposed in the gas compartment 33a on the left side of FIG. 5 of the tank 20B. The second disconnector 23 is located below the branch pipe portion 20 b, and the pole on the fixed contact portion 23 b side is connected to the conductor 24 a of the bushing 24.

  The poles on the movable contact portions 22a, 23a side of the first and second disconnectors 22, 23 also serve as fixed contact portions of the ground switch 25, respectively. And so that the earthing | grounding switch 25 can contact the movable contact part (not shown) to the pole of the 1st and 2nd disconnectors 22 and 23 at the side of the movable contact part 22a, 23a side, It is arranged. Moreover, the current transformer 26 is provided on both sides of the arc extinguishing chamber 21E in the tank 20B. Further, the voltage transformer 27 is connected to the pole on the fixed contact portion 23b side of the second disconnector 23 and is disposed in the tank 20B.

  In the second embodiment, one standard unit TB2 and one standard in which devices such as the circuit breaker 21, the disconnectors 22 and 23, and the ground switch 25 are collectively stored in a single tank 20 and 20B, respectively. Unit TB11 and two standard units TB12 are installed and connected in series on the premises to form a phase-separated 1-1 / 3 CB bay compound gas insulated switchgear as shown in FIGS. is doing.

Next, installation work of the composite gas insulated switchgear according to the second embodiment will be described.
First, the standard units TB11, TB12, TB2 and the bushing 24 are assembled at the factory and carried into the field. At this time, the bushing 24 is not attached to the standard units TB11, TB12, and TB2, and the opening of each branch pipe portion 20b is closed with a cover plate (not shown).
Then, two standard units TB12 are installed in series at a predetermined position on the site with the axes of the tanks 20B substantially aligned so that the standard units TB11 and TB2 are positioned on both sides of the standard units TB12 arranged in a row. In addition, the axes of the tanks 20, 20A, 20B are substantially aligned so that they are installed in a row on the site.
Next, the opposite end flanges 20a of the two standard units TB12 are removed, and the poles on the fixed contact portion 22a side of the opposed first disconnectors 22 of the two standard units TB12 are connected by a conductor 32. Then, the cover plate is removed, and the bushing 24 is attached to the branch pipe portion 20b. Furthermore, the pole on the fixed contact portion 23b side of the second disconnector 23 of the other standard unit TB12 and the conductor 24a of the bushing 24 are connected. Furthermore, the standard units TB12 are connected by the bellows 29.

Next, the opposing end flanges 20a of the standard units TB11 and TB12 are removed, and the poles on the stationary contact portion 22a side of the opposing first disconnector 22 of the standard units TB11 and TB12 are connected by a conductor 32. And each cover plate is removed and the bushing 24 is attached to each branch pipe part 20b. Further, the pole on the fixed contact portion 23b side of the second disconnector 23 of the standard units TB11 and TB12 and the conductor 24a of the bushing 24 are connected to each other. Furthermore, the standard units TB11 and TB12 are connected by a bellows 29.
Next, the opposing end flanges 20a of the standard units TB2 and TB12 are removed, and the poles on the fixed contact portion 22a side of the opposing first disconnector 22 of the standard units TB2 and TB12 are connected by a conductor 32. Then, each cover plate of the standard unit TB2 is removed, and the bushing 24 is attached to each branch pipe portion 20b. Furthermore, the poles on the fixed contact portion 23b side of both the second disconnectors 23 of the standard unit TB2 and the conductor 24a of the bushing 24 are connected to each other. Furthermore, the standard units TB2 and TB12 are connected by a bellows 29.
Thereafter, sulfur hexafluoride gas is filled and sealed in the gas compartments 33a, 33b and 33c of the tanks 20, 20A and 20B.

  In this way, the installation of the composite gas insulated switchgear constituting the 1-1 / 3CB bay shown in FIGS. 6 and 7 is completed. Then, for example, a three-phase composite gas insulated switchgear is installed in the premises, and a track in an electric station such as a substation or a power plant is configured. Further, the composite gas insulated switchgear is connected to a main bus, an overhead electric line, a transformer, and the like via a bushing 24.

  Therefore, also in the second embodiment, the same effect as in the first embodiment can be obtained.

  In Embodiments 1 and 2 described above, a plurality of standard units are arranged and connected in series to form a 1-1 / 2CB or 1-1 / 3CB bay. The invention can achieve the same effect even when a ring bus bay is configured using a plurality of standard units.

Embodiment 3 FIG.
FIG. 8 is a cross-sectional view showing the equipment configuration of the composite gas insulated switchgear according to Embodiment 3 of the present invention, and FIG. 9 shows the virtual additional equipment configuration of the composite gas insulated switchgear according to Embodiment 3 of the present invention. It is sectional drawing shown.
In the third embodiment, a bay is configured on the assumption that a standard unit TB12 will be added in the future for the purpose of connection to an overhead electric line or a transformer.
That is, as shown in FIG. 8, the standard unit TB11 having the bushing 24 connected to the main bus and the standard unit TB2 having two bushings 24 connected to the main bus and the transformer are included in the standard unit TB12. The installation length (L) is separated, and the axes of the tanks 20 and 20A are substantially aligned to be arranged in a line in series. Then, the opposing end flanges 20a of the standard units TB11 and TB2 are removed, and the gas insulation bus 30 is disposed between the standard units TB11 and TB2. The gas insulated bus 30 is composed of a cylindrical tank 30a as a container and a bus 30b as a conductor wire disposed at the axial center of the tank 30a. The tank 30a is airtightly attached to the tanks 20 and 20A of the standard units TB2 and TB11, and the bus 30b is connected between the poles on the fixed contact portion 22b side of the first disconnector 22 facing the standard units TB11 and TB2. The bay. The tank 30a is filled and filled with sulfur hexafluoride gas.

  When the standard unit TB12 is added along with the expansion of the electric station, the gas insulated bus 30 is first removed from the standard units TB11 and TB2. Next, the standard unit TB12 is installed between the standard units TB11 and TB2, and both end flanges 20a of the standard unit TB12 are removed. Then, the poles on the stationary contact portion 22b side of the first disconnector 22 facing each other of the standard units TB11 and TB12 are connected by the conductor 32. Then, the cover plate is removed, and the bushing 24 is attached to the branch pipe portion 20b of the standard unit TB12. Furthermore, the pole on the fixed contact portion 23b side of the second disconnector 23 of the standard unit TB12 and the conductor 24a of the bushing 24 are connected. Furthermore, the tanks 20A and 20B of the standard units TB11 and TB12 are connected by a bellows 29. Similarly, the poles on the fixed contact portion 22b side of the first disconnector 22 of the standard units TB12 and TB2 facing each other are connected by a conductor 32, and the tanks 20 and 20B are connected by a bellows 29. Thereafter, sulfur hexafluoride gas is filled and sealed in the gas compartments 33a, 33b, and 33c of the tanks 20, 20A, and 20B, and the expansion work for the electric station is completed.

  As a result, it is possible to realize a circuit constituting a 1-1 / 2 CB bay as shown in FIG. The composite gas insulated switchgear configured as described above can be connected to an overhead electric line or a transformer via the bushing 24 of the added standard unit TB12.

  Thus, in consideration of the future expansion of the standard unit TB12, the standard units TB2 and TB11 are arranged in a line in series with the installation length (L) of the standard unit TB12 separated, and the gas insulated bus 30 is used. Since the standard units TB2 and TB11 are connected to each other, when the standard unit TB12 is added, the extension work is greatly reduced and the construction period can be shortened.

Embodiment 4 FIG.
FIG. 10 is a sectional view showing the equipment configuration of a composite gas insulated switchgear according to Embodiment 4 of the present invention, and FIG. 11 shows the virtual additional equipment configuration of the composite gas insulated switchgear according to Embodiment 4 of the present invention. FIG. 12 is a sectional view showing a standard unit constituting a composite gas insulated switchgear according to Embodiment 4 of the present invention.
In the fourth embodiment, a single-line diagram unit is configured on the assumption that a standard unit TB0 will be added in the future for the purpose of connection to an overhead electric line or a transformer. That is, as shown in FIG. 10, two standard units TB2 having two bushings 24 connected to the main bus and the overhead electric line 31 are separated from the installation length (L) of the standard unit TB0 by The shafts are arranged in a line in series with their axes substantially aligned. And the bushing 24 of standard unit TB2 is connected by the overhead electric wire path 31, and comprises the bay.

  Then, when the standard unit TB0 is added along with the expansion of the electric station, the overhead electric line 31 is first removed from the bushing 24. Next, the standard unit TB0 is installed between the standard units TB2, both end flanges 20a of the standard unit TB0 are removed, and similarly, the end flanges 20a of the standard unit TB2 facing the standard unit TB0 are removed. The poles on the fixed contact portion 22b side of the first disconnector 22 facing each other of the standard units TB2 and TB0 are connected by a conductor 32. The tanks 20 and 20C of the standard units TB2 and TB0 are connected by a bellows 29. Thereafter, sulfur hexafluoride gas is filled and sealed in the gas compartments 33a, 33b and 33c of the tanks 20 and 20C, and the expansion work for the electric station is completed.

  Thereby, the electric circuit which comprises the bay of a 1-1 / 2CB system as shown in FIG. 11 is realizable. The composite gas insulated switchgear configured as described above can be connected to an overhead electric line or a transformer via the bushing 24 of the standard unit TB2.

  In this way, in consideration of the future expansion of the standard unit TB0, the two standard units TB2 are arranged in a line in series with the installation length (L) of the standard unit TB0 separated, and the overhead electric line 31 is used. Since the bushings 24 are connected to each other, when the standard unit TB0 is added, the extension work is greatly reduced and the construction period can be shortened.

Here, as shown in FIG. 12, the standard unit TB0 is configured such that electrical devices such as a circuit breaker 21, a disconnecting switch 22, a grounding switch 25 and the like are housed in a single tank 20C.
The tank 20C is made of iron, is formed in a straight cylindrical shape, and is arranged with its axis substantially horizontal. The tank 20C has end flanges 20a attached to both ends thereof to be hermetically sealed. The tank 20C is divided into three gas compartments 33a, 33b, and 33c by a conical insulating spacer 28, and is a sulfur hexafluoride gas that is an electric insulating gas. Is sealed at a predetermined pressure in each gas compartment 33a, 33b, 33c. And the tank 20C is provided so that the handhole 20c may face the center gas division 33b.

Then, the circuit breaker 21 is supported by the tank 20C by the support insulating cylinder 21c, and the opening / closing operation direction of the arc extinguishing chamber 21E is substantially aligned with the axial direction of the tank 20C, and is arranged in the gas compartment 33b in the center of the tank 20C. It is installed. The conductor 21a on the arc extinguishing chamber 21E side and the conductor 21a on the mechanism portion 21b side are supported by the conical insulating spacers 28, respectively.
Further, the first disconnector 22 has its opening / closing direction substantially coincided with the axial direction of the tank 20C, and the poles on the movable contact portion 22a side are respectively connected to the conductors 21a. The gas compartments 33a and 33c are respectively disposed.

  The poles on the movable contact portion 22 a side of the first disconnector 22 also serve as the fixed contact portion of the ground switch 25. The ground switch 25 is disposed so that the movable contact portion (not shown) can be grounded by contacting the movable contact portion 22a of the first disconnector 22 on the pole. Current transformers 26 are provided on both sides of the arc extinguishing chamber 21E in the tank 20C.

  The standard unit according to the present invention includes a cylindrical tank arranged with the axis direction substantially horizontal, and a circuit breaker arranged in the tank with the opening / closing operation direction substantially coinciding with the axis direction of the tank. A disconnecting switch disposed on both sides of the circuit breaker in the tank, and a grounding switch disposed between the circuit breaker and the disconnecting switch, and the electric insulating gas is filled and sealed in the tank. It goes without saying that other electrical equipment such as a lightning arrester may be disposed in the tank as necessary. That is, a single-line diagram unit is divided into a plurality of electric circuits, and electric devices constituting each divided electric circuit are collectively stored in a single tank to constitute a standard unit.

  According to the present invention, a cylindrical tank disposed with the axial direction substantially horizontal, a circuit breaker disposed in the tank with the opening / closing operation direction substantially coinciding with the axial direction of the tank, A disconnecting switch disposed on each side of the circuit breaker in the tank and electrically connected to the circuit breaker; and a grounding switch electrically connected between the circuit breaker and the disconnecting switch; A plurality of units in which an electrically insulating gas is filled and sealed in the tank, the plurality of units being arranged in a line with the axial centers of the tanks substantially aligned, and electrically connected to each other Since it is connected and constitutes a single-line diagram unit, the number of tanks can be reduced, miniaturization and cost reduction can be realized, and the amount of installation work at the site of new or expanded electric stations can be reduced, and the installation period Combined gas insulation It can be obtained closing device.

  In addition, since at least one set of the adjacent units of the plurality of units is arranged with the lengths of the units separated, when adding the units, the extension units are arranged with the unit lengths separated. It is only necessary to insert the units between the units and electrically connect them to each other, and the unit expansion work is simplified.

  In addition, the tanks of the units of the set that are arranged with the unit length separated are hermetically connected via a gas insulated bus container, and the units of the unit are arranged with the length separated. Since the above-mentioned disconnectors of the above unit are electrically connected via the conductor wire of the gas insulated bus, when adding the unit, remove the gas insulated bus and insert the extension unit between the units. They can be electrically connected to each other, and the expansion of the unit is simplified.

  In addition, a pair of bushings provided at the upper part of the above-mentioned disconnector of each of the tanks of each of the above-mentioned units of the set in which the units are separated from each other in length is arranged. Since the above-mentioned disconnecting switch of the above unit is electrically connected via the overhead wireway spanned by the both bushings, when adding the unit, remove the overhead wireway and install the extension unit. It is only necessary to insert between the units and electrically connect to each other, and the unit expansion work is simplified.

  In addition, the tank of the unit is divided into three gas compartments in the axial direction by insulating spacers, the circuit breaker is disposed in the gas compartment located in the center, and the disconnectors are located on both sides. Since each of the gas compartments is disposed, when inspecting the electrical equipment, the electrical insulation gas enclosed in the gas compartment adjacent to the equipment is removed and the disconnecting device is opened to remove the equipment from the system. It can be electrically isolated and can be inspected without turning off the system power.

It is sectional drawing which shows standard unit TB2 which comprises the composite gas insulated switchgear which concerns on Embodiment 1 of this invention. It is sectional drawing which shows standard unit TB11 which comprises the composite gas insulated switchgear which concerns on Embodiment 1 of this invention. It is an electric circuit diagram which shows the 1-1 / 2CB system single line connection diagram unit which concerns on Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is an apparatus block diagram of the composite-type gas insulated switchgear which comprises the 1/1 / 2CB system single line connection diagram unit which concerns on Embodiment 1 of this invention. It is sectional drawing which shows standard unit TB12 which comprises the composite gas insulated switchgear which concerns on Embodiment 2 of this invention. It is an electric circuit diagram which shows the 1 / 3CB system single wire connection diagram unit which concerns on Embodiment 2 of this invention. It is an apparatus block diagram of the composite-type gas insulated switchgear which comprises the 1 / 3CB system single line connection diagram unit which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the apparatus structure of the composite gas insulated switchgear which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the virtual extension apparatus structure of the composite gas insulated switchgear which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the apparatus structure of the composite gas insulated switchgear which concerns on Embodiment 4 of this invention. It is sectional drawing which shows the virtual extension apparatus structure of the composite gas insulated switchgear which concerns on Embodiment 4 of this invention. It is sectional drawing which shows standard unit TB0 which comprises the composite gas insulated switchgear which concerns on Embodiment 4 of this invention. It is a figure explaining the structure of the conventional gas insulated switchgear of a 1/1/2 circuit breaker system.

Explanation of symbols

  20, 20A, 20B, 20C tank, 21 breaker, 22 first disconnector, 23 second disconnector, 24 bushing, 25 ground switch, 28 conical insulating spacer, 30 gas insulating bus, 30a tank (container), 30b Busbar (conductor wire), 31 Overhead electric wire path, 33a, 33b, 33c Gas compartment, TB0, TB2, TB11, TB12 Standard unit.

Claims (3)

A cylindrical tank arranged with the axial direction substantially horizontal, a circuit breaker arranged in the tank with the opening / closing operation direction substantially coinciding with the axial direction of the tank, and the interruption in the tank A disconnector electrically connected to the circuit breaker, and a grounding switch electrically connected between the circuit breaker and the disconnector. A plurality of units in which gas is filled and sealed in the tank are provided, the plurality of units are arranged in a line with the axial centers of the tanks substantially aligned, and are electrically connected to each other, so In the combined gas insulated switchgear constituting the figure unit,
The at least one set of adjacent units of the plurality of units is arranged with the lengths of the units separated,
A bushing is provided on the upper side of the opposite disconnector of each tank of each of the units of the set in which the units are separated in length;
The unit between the disconnecting switches of the set of units arranged separately from each other in length is electrically connected via an overhead electric wire routed over the bushings. Combined gas insulated switchgear. A cylindrical tank arranged with the axial direction substantially horizontal, a circuit breaker arranged in the tank with the opening / closing operation direction substantially coinciding with the axial direction of the tank, and the interruption in the tank A disconnector electrically connected to the circuit breaker, and a grounding switch electrically connected between the circuit breaker and the disconnector. A plurality of units in which gas is filled and sealed in the tank are provided, the plurality of units are arranged in a line with the axial centers of the tanks substantially aligned, and are electrically connected to each other, so In the combined gas insulated switchgear constituting the figure unit,
The at least one set of adjacent units of the plurality of units is arranged with the lengths of the units separated,
The tanks of the units of the set that are separated from each other by the length of the units are hermetically connected via a gas insulated bus container,
A combined gas insulation, wherein the opposing disconnectors of the units of the unit arranged in a group separated from each other in length are electrically connected via a conductor wire of the gas insulation bus Switchgear.   The tank of the unit is divided into three gas compartments in the axial direction by insulating spacers, the breaker is disposed in the gas compartment located in the center, and the disconnectors are located on both sides. 3. The combined gas insulated switchgear according to claim 1 or 2, wherein the combined gas insulated switchgear is disposed in each of the compartments.

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