JP2003009322A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a 1 to 1/2 system gas-insulated switchgear which reduces deterioration of interpolar capacitors, has a simple construction and is small- sized by removing the capacitors out of metal containers for circuit-breakers, and housing apparatuses in the metal containers collectively. SOLUTION: Three units 100, 200, 300 which have, in the metal containers 101, 201, 301 filled with insulation gases and grounded, at least power-circuit circuit breakers 102, 202, 302, disconnectors 103, 104, 203, 204, 303, 304 and grounding switches 120, 220, 320 which are arranged and connected respectively to both ends of these circuit breakers, are connected in series to each other successively. A capacitor 48 is arranged respectively near each bushing 403, 404 and connected to a load side, and load-side disconnectors 205, 206 are installed in the metal containers.

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, and more particularly to a 1-1 / 2 type structure.

[0002]

2. Description of the Related Art FIG. 7 is a connection diagram of a conventional general 1-1 / 2 type gas-insulated switchgear, and FIG. 8 is a configuration diagram thereof.
In both figures, 1 (1a, 1b, 1c) is the first main bus,
2 (2a, 2b, 2c) is the second main bus, 3 (3a, 3
b, 3c) is a lead wire connected to the first load side, 4 (4a,
4b, 4c) are leader lines connected to the second load side.
43a, 43b and 43c are power circuit breakers 1 respectively
It is an inter-electrode capacitor housed inside 1, 12, and 13.

In the 1-1 / 2 system, switching and inspection of power supply from the main buses 1 and 2 to the lead wires 3 and 4 on the load side are performed.
Circuit breakers 11, 12, and 13 are used for disconnecting in the event of an accident. First
Is supplied from the main busbar 1 to the lead wire 3 on the first load side via the disconnector 21, the circuit breaker 11, and the disconnectors 22, 27, and the first main busbar 1 to the second load side. Is supplied to the lead wire 4 via the disconnector 21, the circuit breaker 11, the disconnectors 22, 23, the circuit breaker 12, and the disconnectors 24, 28.

Further, the supply from the second main bus 2 to the lead wire 3 on the first load side is performed by the disconnector 26, the circuit breaker 13, the disconnectors 25, 24, the circuit breaker 12, and the disconnectors 23, 27. The supply from the second main bus 2 to the lead line 4 on the second load side is performed via the disconnector 26, the circuit breaker 13, and the disconnectors 25, 28.

As described above, in the 1-1 / 2 system, the lead wire 3 on the first load side and the lead wire 4 on the second load side are connected from both the first main bus 1 and the second main bus 2. Since the supply route can be secured, the possibility of supply failure is low and a reliable system can be realized.

Including the above-mentioned 1-1 / 2 system, the single-point breaker, which is a component of the power generation / substation and switchgear, has a large short circuit breaking capacity, and an interelectrode capacitor is often used.
This is because, in the case of an AC circuit breaker, the current is cut off at the zero current point, and then a recurrent voltage occurs between the poles. The circuit breaker is sensitive to the re-electromotive force, and the initial rate of voltage rise has a great influence on the breaking performance. The waveform of the regenerated voltage at this time is determined by the inductance distributed in the line, capacitance, and various loss components.

When a ground fault occurs on the line, the line-side capacitor is inserted in the line, the inter-electrode capacitor, and the ground circuit to delay the rise of the re-electromotive force on the line side and reduce the severity. You can Therefore, it is well known that an inter-electrode capacitor is generally provided in a circuit breaker having a heavy current short-distance failure interrupting duty.

FIG. 9 is a sectional view showing the structure of a conventional tank-type circuit breaker in which an interelectrode capacitor is arranged in a conventional grounded tank as disclosed in Japanese Patent Laid-Open No. 1-10535. In the figure, 32 is a grounded tank that is grounded, 34 is a conductor, and 36
Is an insulator attached to the ground tank 32 and attached to the ground tank 32, and 37 is a piston having a through hole attached to the insulator 36, to which one conductor 34 is connected.

Reference numeral 38 denotes a buffer cylinder slidably fitted to the piston 37, 39 denotes a movable contact member slidably fitted in a through hole of the piston 37 and movable together with the buffer cylinder 38, and 40 denotes a buffer cylinder 38. Nozzles that surround the fixed movable contact 39 with a predetermined gap, 4
Reference numeral 1 is an insulator fixed to the piston 37, 42 is a fixed contact fixed to the insulator 41 so that the movable contact 39 can be contacted and separated, and is connected to the other conductor 34.

Reference numeral 43 denotes an inter-electrode capacitor disposed between the piston 37 and the fixed contact 42, which has a structure in which a plurality of high dielectric constant ceramic elements are arranged in series and in parallel. Reference numeral 44 is an arc extinguishing chamber consisting of reference numerals 37 to 43, and 47 is SF6 gas as an insulating medium filled in the ground tank 32.

Next, the breaking operation will be described. When the ground fault current is detected, the buffer cylinder 38, the movable contact 39 and the nozzle 40 are moved to the right by an operating mechanism (not shown).
The movable contact 39 moves in the direction of arrow A and the movable contact 39 moves to the fixed contact 4.
Separate from 2. Then, a high-voltage arc is generated between the contacts 39, 42. This arc has a large amount of energy, gives radiant heat to the surroundings, and causes the SF6 gas 47 to have a high pressure and a high temperature. SF6 gas 4 in the buffer cylinder 38
7 is compressed by a fixed piston 37, and the compressed SF6 gas 47 is sprayed on the arc through a nozzle 40 to cool the arc and cut off the current.

Therefore, the inter-electrode capacitor 43 is exposed to a high-temperature insulating medium, that is, SF6 gas 47 and arc radiation heat, which accelerates the deterioration of the capacitor 43, and the contacts 3
There is a problem in that there is a gap between the capacitors 9, 42 and the condenser 43, an insulation distance is required between the condenser 43 and the ground tank 32, and the diameter of the ground tank 32 becomes large.

In order to solve this problem, in Japanese Patent Laid-Open No. 1-10535, the capacitor 48 is removed from the ground tank 32 as shown in FIG. 10, and the capacitor 48 is provided near the bushing connected to the line side. , And by electrically and mechanically connecting one terminal of the capacitor to the tip of the bushing and the other terminal to the ground tank, the capacitor will not be exposed to the arc and the deterioration of the capacitor will be small, and the ground tank A circuit breaker structure that can be miniaturized has been proposed.

In FIG. 10, reference numeral 32 is a ground tank similar to the above-mentioned conventional example. Reference numeral 31 is a pedestal that supports the ground tank 32, 33 is a bushing, 35 is a bushing current transformer that detects a current flowing through an internal conductor of the bushing 33, 45 is an operating mechanism, 46 is a main circuit terminal, and 48 is a tip portion of the bushing 33. Is an external capacitor grounded by electrically and mechanically connecting one end to the bushing attachment part of the ground tank 32 and electrically and mechanically connecting the other end. The external capacitor 48 may be an oil-filled capacitor, a capacitor insulated with SF6 gas, or a conventional high dielectric capacitor made of a similar ceramic element, and is housed in a porcelain tube.

A circuit breaker having a structure in which a capacitor is arranged near the bushing connected to the line side as described above is shown in FIG.
If you try to apply it to the general 1-1 / 2 system as shown in Fig. 1, the position of the line side viewed from the circuit breaker will change depending on the main bus used, and how the substation building side will change. Since it is unclear whether or not to arrange the equipment, it is necessary to provide capacitors for all the circuit breaker bushings, which is uneconomical.Therefore, a circuit breaker with a structure in which an inter-electrode capacitor is arranged in the ground tank is generally applied. ing.

[0016]

SUMMARY OF THE INVENTION From the above,
Since the circuit breaker applied to the 1-1 / 2 type gas insulated switchgear has a structure in which an inter-electrode capacitor is arranged in the ground tank, there is a problem that deterioration of the capacitor and an increase in the ground tank diameter cannot be avoided. Also, as mentioned above, no good solution to this has been found.

The present invention has been made to solve the above-mentioned problems, and the deterioration of the capacitor is small,
1-1 / 2 with circuit breaker that can downsize the grounded tank
An object of the present invention is to provide a gas insulated switchgear of the type.

It is another object of the present invention to provide a more economical 1-1 / 2 type gas insulated switchgear in which the number of capacitors used is reduced.

[0019]

In view of the above object, the present invention provides a grounded metal container filled with an insulating gas, at least one power circuit breaker and both ends of the power circuit breaker. A gas insulated switchgear of the 1-1 / 2 type is characterized in that three units for accommodating a disconnecting switch and a grounding switch that are connected and connected are sequentially connected in series.

Further, one of the units at both ends of the three units is provided with a bushing through which a conductor for the first busbar passes, and one of the disconnection lines in which the conductor is connected and arranged at both ends of the power circuit breaker. To a disconnecting switch connected to the other side of the power circuit breaker and connected to the other side of the power circuit breaker, conductors led from opposite ends of the central unit are connected, and the other of the units at both ends is the second busbar. A conductor for passing through a bushing, said conductor being connected to one disconnector connected to both ends of said power circuit breaker,
Conductors led out from opposite ends of the central unit are connected to a disconnector connected to the other side of the power circuit breaker, and the central unit is connected to both ends of the power circuit breaker. First load side disconnector and second
And a bushing bushing through which a conductor connected to the first load side passes and a bushing through which a conductor connected to the second load side passes.
A load side disconnector and a second load side disconnector are housed in the metal container, and the conductor connected to the first load side and the conductor connected to the second load side are the first Is connected to the load side disconnector and the second load side disconnector, respectively, and the first load side disconnector and the second load side disconnector are connected to both ends of the power circuit breaker. And the conductors led out to the opposite ends of the units on both sides are respectively connected to the disconnectors connected to both ends of the power circuit breaker. To do.

Further, one of the units at both ends of the three units is connected to the bushing through which the conductor for the first busbar passes and the power circuit breaker, and is connected to the opposite side of the bushing. A load side disconnecting switch and a bushing through which a conductor connected to the first load side passes;
A load side disconnector is housed in the metal container, a conductor for the first busbar is connected to one disconnector connected to both ends of the power circuit breaker, and the first load A conductor connected to the first side is housed in the metal container.
Connected to the other load side disconnector, and the first load side disconnector is connected to the other disconnector connected to the power circuit breaker and is led out from the opposite end of the central unit. A second load-side disconnector connected to the opposite side of the power circuit breaker and the bushing through which the conductor for the second bus passes, and the other of the units at both ends is connected. And a bushing through which a conductor connected to the second load side passes, the disconnector on the second load side is housed in the metal container, and the conductor for the second busbar is the power circuit. A conductor connected to one of the disconnectors connected to both ends of the circuit breaker and connected to the second load side is connected to a second load side disconnector housed in the metal container; A second load side disconnector is provided at both ends of the power circuit breaker. The conductor that is connected to the other disconnecting switch that is continuously connected and that is led out from the opposite ends of the central unit is connected, and the conductor that is led out to the opposite ends of the units on both sides of the central unit is The electric power circuit breaker is connected to both ends of the circuit breaker.

Further, capacitors are respectively arranged in the vicinity of the bushings through which the conductors connected to the first load side pass and the bushings through which the conductors connected to the second load side pass, and one of the capacitors is disposed. The terminal is the first
The tip of the bushing through which the conductors connected to the load side and the second load side pass, and the other terminal are electrically and mechanically connected to the metal container, respectively.

Further, the power circuit breaker housed in the metal container is cut to one point, and the operating device for the power circuit breaker with one cut is arranged in a direction perpendicular to the axial direction of the metal container. The disconnecting switches at both ends of the power circuit breaker are arranged to be connected in the axial direction of the metal container.

Further, bushings through which the conductors connected to the first load side and the second load side pass are supported by respective branch pipe portions extending to the outside of the metal container,
The first load side disconnector and the second load side disconnector are accommodated in the branch pipe portion, respectively.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 is a connection diagram of a 1-1 / 2 type gas-insulated switchgear according to Embodiment 1 of the present invention, and FIG. 2 is an outline drawing thereof. In both figures, 1 is a first main busbar, 2 is a second main busbar, 3 is a lead wire connected to the first load side or line side, and 4 is a lead wire connected to the second load side or line side. It is a line (see FIG. 2).

Reference numeral 100 includes a bushing 401 connected to the first main bus 1, a power circuit breaker 102, disconnectors 103 and 104 at both ends of the breaker 102, and a current transformer 11.
0 is a unit in which the grounding switch 120 is housed in a grounding tank 101 which is a grounded metal container filled with an insulating gas, 115 is an operating mechanism of the circuit breaker 102, and 109 is a mount of the grounding tank 101.

Reference numeral 200 includes a bushing 403 connected to the first lead-side lead wire 3 and a bushing 404 connected to the second load-side lead wire 4, and the disconnectors 203 and 204 at both ends of the power circuit breaker 202. And a current transformer 210, a grounding switch 220, a first load-side disconnecting switch 205, a second load-side disconnecting switch 206, and a grounding switch 230, which are grounded metal containers filled with an insulating gas. Reference numeral 215 is a unit housed in 201, 215 is an operation mechanism of the circuit breaker 202, and 209 is a base of the ground tank 201. Also, 2
Reference numerals 07 and 208 are branch pipe portions extending to the outside of the ground tank 201, and reference numerals 407 and 409 are connecting pipes extending to the units on both sides.

The reference numeral 300 includes a bushing 402 connected to the second main bus 2, a power circuit breaker 302, and a breaker 3.
A unit in which the disconnectors 303, 304 at both ends of 02, the current transformer 310, and the grounding switch 320 are housed in a grounding tank 301 which is a grounded metal container filled with insulating gas,
315 is an operation mechanism of the circuit breaker 302, and 309 is a mount of the ground tank 301.

Each ground tank is a grounded metal container filled with insulating gas.

Next, the above units 100, 200, 300
A configuration of a 1-1 / 2 type gas-insulated switchgear in which is connected in series will be described.

The unit 100 at one end of these three phases (three units connected in series in series) is provided with a bushing 401 through which the conductor for the first busbar 1 passes, and the conductor is connected to the circuit breaker 102. The disconnector 104 connected to the disconnected disconnector 103 and connected and arranged on the opposite side of the circuit breaker 102 is connected to a conductor 406 led out from the end facing the central unit 200.

The unit 300 at the other end is provided with a bushing 402 through which a conductor for the second busbar 2 passes, the conductor being connected to a disconnecting switch 304 connected to a circuit breaker 302, sandwiching the circuit breaker 302. The disconnecting switch 303 connected and arranged on the opposite side is connected to the conductor 408 led out from the facing end of the central unit 200.

The central unit 200 includes a disconnector 203 connected to a circuit breaker 202 and a lead wire 3 on the first load side.
The bushing 403 and the second through which the conductor for connection passes
Of the first load side lead wire 3 in which the conductor is housed in the ground tank 201, and the disconnector 205 and the second load side lead wire are provided with a bushing 404 for connection. Respectively connected to the disconnector 206 for line 4.
Disconnector 20 for these first load side leads 3
5, the disconnector 206 for the lead wire 4 on the second load side is a disconnector 203 connected to both ends of the circuit breaker 202,
Each is connected to 204.

Further, conductors 406 and 408 led out from the ends of the units 100 and 300 facing each other on both sides of the unit 200 are connected to disconnecting switches 203 and 204 respectively connected to both ends of the circuit breaker 202. .
An external capacitor 48 is provided near the bushing 403 through which the conductor connected to the first load side lead wire 3 passes and the bushing 404 through which the conductor connected to the second load side lead wire 4 passes. And a tip portion of bushings 403 and 404 through which conductors connected to the first load-side lead wire 3 and the second load-side lead wire 4 pass, and one terminal of the external capacitor 48 is disposed, The other terminal is electrically and mechanically connected to the ground tank 201, respectively.

An example of the circuit breaker applied to this embodiment is shown in FIG. In the figure, 101, 102, 115
Is the same as above. Reference numeral 152 is a single-point arc-extinguishing chamber of the circuit breaker, 151 is an electrode that supports the movable side of the arc-extinguishing chamber 152, 153 is an electrode that supports the fixed side of the arc-extinguishing chamber, and 150 is the axial direction of the ground tank 101. Operation mechanism 1 arranged at a right angle
An insulator through which an operation rod extending from 15 penetrates to support the movable electrode 151, and 154 denotes an electrode 151 from the ground tank 1
A conductor extending in the axial direction of 01 and connected to the disconnector 103, 1
55 is a conductor that extends from the electrode 153 in the axial direction of the ground tank 101 to hold the contact 156, and 157 is the contact 156.
Is a conductor connected to the disconnecting switch 104.

By configuring as described above, the circuit breaker 102
The disconnectors 103, 104 can be arranged linearly in the axial direction of the ground tank 101 at both ends of the unit, and the total length of the unit can be reduced. Although the circuit breaker 102 is shown in FIG. 5, other circuit breakers can basically have the same configuration.

FIG. 6 shows an example of the configuration of the disconnecting switch applied to this embodiment. In the figure, 48, 403, 20
1, 207 and 407 are the same as above. Reference numeral 161 denotes a movable side of the disconnector, 160 denotes a fixed side of the disconnector, 162 denotes a movable contact which constitutes the movable side 161 of the disconnector, and 163
Is a conductor passing through the bushing 403.

By constructing the disconnector in the branch pipe portion to which the bushing is attached as described above, a branch tank for the disconnector is not required and the tank parts can be reduced. Although FIG. 6 shows the disconnector 205, for example, the disconnector 206 can basically have the same configuration.

Next, the operation when the ground fault current flows on the first load side 3 indicated by the lead wire 3 will be described. When power is supplied from the first main bus 1, the unit 1
00, through the bushing 403 in the unit 200, a ground fault current flows through the lead wire 3 on the first load side, the current is detected by the current transformer 110, and the breaker 102 is operated by the operating mechanism 1.
It is operated by 15. At this time, the line of the lead wire 3 on the first load side, the ground, the circuit of the external capacitor 48,
The rise of the re-electromotive force on the line side can be delayed by the external capacitor 48, and the circuit breaker 102 can be operated favorably in short-distance interruption of large current.

When electric power is being supplied from the second main bus 2, the unit 300 and the unit 200 are passed through the bushing 403 in the unit 200 to the first load side 3 indicated by the lead wire 3. A ground fault current flows, currents are detected by the current transformers 210 and 310, and the breaker 202 is operated by the operating mechanism 215. Normally, since the circuit breaker near the line side is operated, the circuit breaker 302 is not operated. At this time, the line of the lead wire 3 on the first load side, the ground, and the circuit of the external capacitor 48 are provided, and the rise of the re-electromotive force on the line side is delayed by the external capacitor 48, which is excellent in short-distance fault interruption of large current. The circuit breaker 202 can be operated.

Even when a ground fault current flows on the second load side 4 indicated by the lead wire 4, the circuit breaker close to the load side operates in the same manner, and the external capacitor increases due to the rise of the recurrent voltage on the line side at this time. The delay is provided by 48, and the circuit breaker can be operated favorably in short-distance fault interruption of large current.

1-1 / 2 constructed and operated as described above
In the gas-insulated switchgear of the type, a capacitor is arranged in the vicinity of a bushing through which a conductor connected to a first load side passes and a bushing through which a conductor connected to a second load side passes, and one of the capacitors The terminal of the first
Since the tip of the bushing through which the conductors connected to the load side and the second load side pass and the other terminal are electrically and mechanically connected to the ground tank, which is a metal container, respectively, The capacitor is not deteriorated because it is not exposed to an arc, the life of the capacitor can be extended, and the tank can be downsized by eliminating the capacitor from the grounded tank.

Further, in the conventional structure in which the circuit breaker is equipped with the inter-electrode capacitor, the number of capacitors required for the number of circuit breakers is only the number of bushings on the line side, that is, the load side, and the number of parts can be reduced. Furthermore, by placing the circuit breaker and disconnector in the axial direction of the grounded tank, and storing the disconnector on the load side in the branch pipe section where the bushing is installed, it is compact as a whole, and it is possible to reduce the number of tank parts Na 1
A -1/2 type gas insulated switchgear can be obtained.

Embodiment 2. 3 is a wiring diagram of a 1-1 / 2 type gas insulated switchgear according to Embodiment 2 of the present invention, and FIG. 4 is an outline drawing thereof. In both figures, 1 is a first main busbar, 2 is a second main busbar, 3 is a leader line connected to the first load side, and 4 is a leader line connected to the second load side (FIG. 4). reference).

Reference numeral 140 includes a bushing 401 connected to the first main bus 1 and a bushing 403 connected to the lead wire 3 on the first load side. The circuit breaker 102 and the disconnectors 103 at both ends of the circuit breaker 102 are provided. 104 is a unit in which the current transformer 110, the grounding switch 120, the first load side disconnector 205 and the grounding switch 130, which are indicated by the lead wire 3, are housed in the grounding tank 141, and 115 is the operation of the circuit breaker 102. The mechanism 109 is a stand for the ground tank 141. Also, 1
Reference numeral 07 denotes a branch pipe portion extending outside the ground tank 201.

Reference numeral 240 designates the disconnectors 20 at both ends of the circuit breaker 202.
3, 204, a current transformer 210, and a grounding switch 220 are accommodated in a grounding tank 241. 215 is an operating mechanism for the circuit breaker 202, and 209 is a mount for the grounding tank 241. Further, 407 and 409 are connecting pipes extending to the units on both sides, respectively.

Reference numeral 340 includes a bushing 402 connected to the second main bus 2 and a bushing 404 connected to the lead wire 4 on the second load side. The circuit breaker 302 and the disconnectors 303, 304 at both ends of the circuit breaker 302. And a current transformer 310, a grounding switch 320, and a second load side disconnector 206 and a grounding switch 330 indicated by the lead wire 4 in a grounding tank 341, and 315 is a mechanism for operating the circuit breaker 302. , 309 are mounts for the ground tank 341. Also, 2
Reference numeral 06 denotes a branch pipe portion extending outside the ground tank 341.

Next, the above units 140, 240, 340
A configuration of a 1-1 / 2 type gas-insulated switchgear in which is connected in series will be described.

The unit 140 at one end of these three phases is provided with a bushing 401 through which a conductor for the first busbar 1 passes, the conductor being connected to the disconnector 103 connected to the circuit breaker 102, and further being drawn out. Bushing 40 through which a conductor for connection to the first load side 3 shown by line 3 passes
3, the conductor for connection to the first load side 3 is connected to the disconnector 205 of the first load side 3 housed in the ground tank 141, and the disconnector 1 is sandwiched across the circuit breaker 102.
The disconnector 2 is connected to the disconnector 104 connected to the side opposite to 03.
05 is connected and arranged, and the conductors 410 led out from the opposite ends of the central unit 240 are connected. Further, an external capacitor 48 is arranged in the vicinity of the bushing 403 through which the conductor connected to the first load side 3 passes, and one terminal of the external capacitor 48 is connected to the conductor connected to the first load side 3. Bushing 403 to pass
And the other terminal is electrically and mechanically connected to the ground tank 141.

The unit 340 at the other end is provided with a bushing 402 through which a conductor for the second busbar 2 passes, said conductor being connected to a disconnecting switch 304 connected to a circuit breaker 302, and further being connected by a lead wire 4. The second load side 4 shown includes a bushing 404 through which a conductor for connecting to the second load side 4 passes, and a conductor for connecting to the second load side 4 of the second load side 4 housed in a ground tank 341. Disconnector 206
And the disconnector 206 is connected to the disconnector 303, which is connected to the disconnector 302 on the side opposite to the disconnector 304 with the circuit breaker 302 interposed therebetween, and the conductor 411 led out from the opposite end of the central unit 240. Are connected. Further, the external capacitors 48 are arranged in the vicinity of the bushings 404 through which the conductors connected to the second load side 4 pass, and one terminal of the external capacitor 48 is connected to the second load side 4. Bushing 4 through which the conductor passes
The tip of 04 and the other terminal are electrically and mechanically connected to the ground tank 341.

The central unit 240 includes disconnectors 203 and 204 connected to the circuit breaker 202, and conductors 410 and 411 led to opposite ends of the units 140 and 340 on both sides are connected to the circuit breaker 202. It is configured to be connected to the disconnecting switches 203 and 204 connected and arranged at both ends, respectively.

Also in the present embodiment, each circuit breaker applied thereto can be configured as shown in FIG. 5 described above, and the same effect can be obtained.

The disconnector can also be constructed as shown in FIG. 6 and the same effect can be obtained.

Next, the operation when the ground fault current flows on the first load side 3 will be described. When power is supplied from the first main bus 1, a ground fault current flows to the first load side 3 via the unit 140 and the bushing 403 in the unit 140, and the current is detected by the current transformer 110. Then
The circuit breaker 102 is operated by the operating mechanism 115. At this time, the line of the first load side 3, the ground, the external capacitor 4
The external circuit 48 delays the rise of the re-electromotive force on the line side by the external capacitor 48, and the breaker 102 can be operated well in short-distance fault interruption of large current.

When electric power is supplied from the second main bus 2, a ground fault current flows to the first load side 3 through the unit 340 and the unit 240 and the bushing 403 in the unit 140, The current is detected by the current transformers 210 and 310, and the breaker 202 is operated by the operating mechanism 215. Normally, since the circuit breaker near the line side is operated, the circuit breaker 302 is not operated. At this time,
It becomes a circuit of the line on the first load side 3, the ground, and the external capacitor 48.
8, the circuit breaker 202 can be satisfactorily operated in the short-distance fault interruption of large current.

Even when a ground fault current flows on the second load side 4, the circuit breaker close to the load side operates in the same manner, and the rise of the re-elevation voltage on the line side at this time is delayed by the external capacitor 48. It is possible to operate the circuit breaker satisfactorily in the short-distance fault interruption of large current.

1-1 constructed and operated as described above
In the two-system gas-insulated switchgear, capacitors are respectively arranged in the vicinity of the bushings through which the conductors connected to the first load side pass and the bushings through which the conductors connected to the second load side pass. One end is electrically and mechanically connected to the tip of the bushing through which the conductors connected to the first load side and the second load side pass, and the other terminal to the metal container serving as the ground tank. By doing so, the capacitor is not exposed to the arc at the time of interruption, deterioration of the capacitor is small, the life of the capacitor can be extended, and the tank can be miniaturized by eliminating the capacitor from the grounded tank.

Further, in the conventional construction in which the circuit breaker is equipped with the interelectrode capacitor, the number of capacitors required for the number of circuit breakers is only the number of bushings on the line side, that is, the load side, and the number of parts can be reduced. Furthermore, by placing the circuit breaker and disconnector in the axial direction of the grounded tank, and storing the disconnector on the load side in the branch pipe section where the bushing is installed, it is compact as a whole, and it is possible to reduce the number of tank parts Na 1
A -1/2 type gas insulated switchgear can be obtained.

In the first and second embodiments, the case where the capacitor is installed near the line side bushing has been described, but the same effect can be obtained even if it is not near the bushing as long as it is a part of the line side circuit. can get. Further, the capacitor may be housed in a groundable metal tank instead of being housed in the porcelain tube, and may be provided in a portion to be a circuit on the line side.

[0060]

As described above, according to the present invention, at least one power circuit breaker is connected to both ends of this power circuit breaker in a grounded metal container filled with insulating gas. The gas insulated switchgear of the 1-1 / 2 type is characterized in that three units for accommodating the disconnecting switch and the grounding switch are connected in series one after another, so they are stored together in three metal containers. It is possible to provide a gas insulated switchgear of 1-1 / 2 type having a simple structure and a small size.

Further, one of the units at both ends of the three units is provided with a bushing through which a conductor for the first busbar passes, and one of the disconnection lines in which the conductor is connected and arranged at both ends of the power circuit breaker. To a disconnecting switch connected to the other side of the power circuit breaker and connected to the other side of the power circuit breaker, conductors led from opposite ends of the central unit are connected, and the other of the units at both ends is the second busbar. A conductor for passing through a bushing, said conductor being connected to one disconnector connected to both ends of said power circuit breaker,
Conductors led out from opposite ends of the central unit are connected to a disconnector connected to the other side of the power circuit breaker, and the central unit is connected to both ends of the power circuit breaker. First load side disconnector and second
A disconnector on the load side, a bushing through which a conductor connected to the first load side passes, and a bushing bushing through which a conductor connected to the second load side passes.
A load side disconnector and a second load side disconnector are housed in the metal container, and a conductor connected to the first load side and a conductor connected to a second load side are the first Is connected to the load side disconnector and the second load side disconnector, respectively, and the first load side disconnector and the second load side disconnector are connected to both ends of the power circuit breaker. While being respectively connected to the disconnector, the conductors led out to the opposite ends of the units on both sides are configured to be respectively connected to the disconnectors connected to both ends of the power circuit breaker, It is possible to provide a gas insulated switchgear of the 1-1 / 2 type, which has a simple structure and is compact, in which the central unit is provided with a bushing through which the conductors connected to the first and second load sides pass.

In addition, one of the units at both ends of the three units is connected to the bushing through which the conductor for the first busbar passes and the power circuit breaker, and is connected to the opposite side of the bushing. A load side disconnecting switch and a bushing through which a conductor connected to the first load side passes;
A load side disconnector is housed in the metal container, a conductor for the first busbar is connected to one disconnector connected to both ends of the power circuit breaker, and the first load A conductor connected to the first side is housed in the metal container.
Connected to the other load side disconnector, and the first load side disconnector is connected to the other disconnector connected to the power circuit breaker and is led out from the opposite end of the central unit. A second load-side disconnector connected to the opposite side of the power circuit breaker and the bushing through which the conductor for the second bus passes, and the other of the units at both ends is connected. And a bushing through which a conductor connected to the second load side passes, the disconnector on the second load side is housed in the metal container, and the conductor for the second busbar is the power circuit. A conductor connected to one of the disconnectors connected to both ends of the circuit breaker and connected to the second load side is connected to a second load side disconnector housed in the metal container; A second load side disconnector is provided at both ends of the power circuit breaker. The conductor that is connected to the other disconnecting switch that is continuously connected and that is led out from the opposite ends of the central unit is connected, and the conductor that is led out to the opposite ends of the units on both sides of the central unit is Since it is configured to be connected to each of the disconnecting switches that are connected to both ends of the power circuit breaker, one of the units on both sides has a bushing through which the conductor connected to the first load side passes, and the other has a second bushing. -1/2 with a simple structure and a bushing through which the conductor connected to the load side of
A gas-insulated switchgear of the type can be provided.

Capacitors are arranged near the bushings through which the conductors connected to the first load side pass and the bushings through which the conductors connected to the second load side pass, respectively. The terminal is the first
Since the tip of the bushing through which the conductors connected to the load side and the second load side pass and the other terminal are electrically and mechanically connected to the metal container,
It is possible to provide a more economical 1-1 / 2 type gas-insulated switchgear with less deterioration of capacitors and a smaller number of capacitors than in the past.

Further, the power circuit breaker housed in the metal container is cut to one point, and the operating device for the power circuit breaker with one cut is arranged in a direction perpendicular to the axial direction of the metal container. Since the disconnecting switches at both ends of the power circuit breaker are arranged to be connected in the axial direction of the metal container, a 1-1 / 2 type gas insulated switchgear having a simple structure and a small size is provided. it can.

Bushings through which the conductors connected to the first load side and the second load side pass are supported by respective branch pipe portions extending to the outside of the metal container,
Since the first load side disconnector and the second load side disconnector are accommodated in the branch pipe portion, respectively,
It is possible to provide a 1-1 / 2 type gas insulated switchgear having a simple structure and a small size by reducing the number of metal containers.

[Brief description of drawings]

FIG. 1 is a connection diagram of a 1-1 / 2 type gas-insulated switchgear according to Embodiment 1 of the present invention.

FIG. 2 is an external view of the gas-insulated switchgear of FIG.

FIG. 3 is a connection diagram of a 1-1 / 2 type gas insulated switchgear according to a second embodiment of the present invention.

4 is an external view of the gas-insulated switchgear of FIG.

FIG. 5 is a diagram showing a configuration example of the circuit breaker according to the first and second embodiments of the present invention.

FIG. 6 is a diagram showing a configuration example of a disconnecting switch according to the first and second embodiments of the present invention.

FIG. 7 is a wiring diagram of a conventional 1-1 / 2 type gas insulated switchgear.

8 is a configuration diagram of the gas-insulated switchgear of FIG.

FIG. 9 is a cross-sectional view showing a configuration of a circuit breaker in which a conventional interelectrode capacitor is arranged.

FIG. 10 is an outline view of a circuit breaker to which a conventional external capacitor is applied.

[Explanation of symbols]

1 1st main bus bar, 2 2nd main bus bar, 3 leader line connected to the 1st load side, 4 leader line connected to the 2nd load side, 48 external capacitors, 100, 140, 20
0,240,300,340 units, 401-40
4 bushings.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ryuichi Okamoto             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F term (reference) 5G017 AA11 BB01 BB02 BB03 BB10                       FF01

Claims (6)

[Claims] 1. A unit for accommodating at least one power circuit breaker and a disconnecting switch and a grounding switch connected to both ends of the power circuit breaker in a grounded metal container filled with an insulating gas. A gas insulated switchgear of the 1-1 / 2 type, characterized in that the three are connected in series in sequence. 2. One of the three units has a bushing through which a conductor for the first busbar passes, one of the two units being disconnected from the other end of the power circuit breaker. To a disconnecting switch connected to the other side of the power circuit breaker and connected to the other side of the power circuit breaker, conductors led from opposite ends of the central unit are connected, and the other of the units at both ends is the second busbar. A disconnector having a bushing through which the conductor passes, the conductor being connected to one disconnector connected to both ends of the power circuit breaker and being connected to the other side across the power circuit breaker. A conductor connected to opposite ends of the central unit is connected to the switch, and the central unit is connected to both ends of the power circuit breaker, and is connected to a first load side disconnector and a second load side disconnector. Disconnector and the And a bushing bushing through which a conductor connected to the second load side passes, and a bushing bushing through which a conductor connected to the second load side passes, the first load-side disconnector and the second load-side disconnector. And a conductor connected to the first load side and a conductor connected to the second load side, the disconnector being connected to the first load side.
A second load side disconnector is respectively connected, and the first load side disconnector and the second load side disconnector are respectively connected to the disconnectors arranged at both ends of the power circuit breaker. The conductors led out to the opposite ends of the units on both sides are connected to disconnecting switches connected to both ends of the power circuit breaker, respectively. Gas insulated switchgear. 3. One of the units at both ends of the three units is connected to the bushing through which the conductor for the first busbar passes and the power circuit breaker on the opposite side to the bushing. A disconnector on the load side and a bushing through which a conductor connected to the first load side passes, wherein the disconnector on the first load side is housed in the metal container and for the first busbar. A first load side disconnector in which a conductor is connected to one disconnector connected to both ends of the power circuit breaker, and a conductor connected to the first load side is housed in the metal container. And the first load-side disconnector is connected to the other disconnector connected to the power circuit breaker, and conductors derived from opposite ends of the central unit are connected to the disconnector. The other of the units at both ends is the conductor for the second busbar. There a bushing conductor connected to the bushing and the power across the circuit breaker a second load side of the breaker is connected disposed opposite thereto a second load passing passes,
The second load side disconnector is housed in the metal container, and the conductor for the second busbar is connected to one disconnector connected to both ends of the power circuit breaker, A conductor connected to the second load side is connected to a second load side disconnector housed in the metal container, and the second load side disconnector is connected to both ends of the power circuit breaker. The conductor connected to the other disconnecting switch and connected to the opposite ends of the central unit is connected, and the central unit is drawn to the opposite ends of the units on both sides. The gas insulated switchgear according to claim 1, wherein the gas insulated switchgear is connected to each of the disconnectors connected to both ends of the circuit breaker. 4. A capacitor is arranged in the vicinity of a bushing through which a conductor connected to the first load side passes and a bushing through which a conductor connected to the second load side passes, respectively, and one of the capacitors is provided. The tip of the bushing through which the conductors connected to the first load side and the second load side pass, and the other terminal are electrically and mechanically connected to the metal container, respectively. The gas insulated switchgear according to claim 2 or 3. 5. The power circuit breaker housed in the metal container is cut at one point, and the operating device for the power circuit breaker having one break is arranged at a right angle to the axial direction of the metal container. The gas-insulated switchgear according to any one of claims 2 to 4, wherein the disconnectors at both ends of the power circuit breaker are connected and arranged in the axial direction of the metal container. 6. A bushing through which a conductor connected to the first load side and a conductor connected to the second load side passes is supported by each branch pipe portion extending to the outside of the metal container, and the bushing is provided in the branch pipe portion. The gas insulated switchgear according to any one of claims 2 to 5, wherein the first load side disconnector and the second load side disconnector are housed respectively.