JP2000041313A - Gas insulated switchgear and method for exchanging circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a circuit breaker exchangeable by only stopping an opening/ closing unit without stopping a gas insulated switchgear at exchanging of the circuit breaker with another, by connecting the upper container portion of the circuit breaker to an upper-stage main bus and the lower container portion of the breaker to a low-stage main bus. SOLUTION: A first main bus section 60 and a second main bus section 70 are respectively laid in an upper stage and a lower stage on the front face of a gas insulated switchgear. A circuit breaker container 81 of a circuit breaker section 80 is constituted by coupling an upper circuit breaker container 81a and a lower circuit breaker container 81b with each other, and the upper container 81a is connected to the upper-stage main bus section 60. The lower container 81b is connected to the second-stage main bus 70. Since the container 80 is constituted by coupling the upper and lower containers 81a and 81b with each other in this way, the upper container 81a can be removed without having to move the circuit breaker.

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 installed in a substation and the like, and a method of replacing a circuit breaker when replacing a circuit breaker of the gas insulated switchgear.

[0002]

2. Description of the Related Art A general structure of a gas insulated switchgear is disclosed, for example, in Japanese Patent Application Laid-Open No. Sho 61-170212. FIG. 9 is a single-line diagram of the configuration, and FIG. 10 is a cross-sectional view of the configuration of the line unit of the gas insulated switchgear. In FIG. 9, 1 is the overall configuration of the gas insulated switchgear, 2 is a line unit, 3 is a bus unit, 4 is a transformer unit, 5 is a transformer, and 6 is a power receiving cable.

In FIG. 10, reference numeral 10 denotes a first main bus portion,
11 is a first main bus container, 12 is a first main bus, 13 is a first bus disconnector, 14 is a ground switch, and 15 is an insulating spacer. Reference numeral 20 denotes a second main bus portion, 21 denotes a second main bus container, 22 denotes a second main bus, 23 denotes a second bus disconnector, 24 denotes a grounding switch, and 25 denotes an insulating spacer. Three
0 is a breaker part, 31 is a breaker container, 32 is a breaker, 33
Is a grounding switch, 34 is a connecting conductor, 35 is a current transformer, 36 is a connecting conductor, 37 is a telescopic container, 38 is an insulating spacer, 30
a is a circuit breaker operation box. 40 is a cable head part, 4
1 is a cable head container, 42 is a connection conductor, 43 is a line disconnector, 44 is a grounding switch, 45 is an instrument transformer, 4
6 is an arrester, 47 is a cable head, and 49 is a cable head base.

In the conventional gas insulated switchgear shown in FIG. 10, a first main bus portion 10 and a second main bus portion 20 of a double bus type three-phase collective bus are arranged at an upper portion, and a line is provided. The configuration of the unit 2 is such that the circuit breaker unit 30 is disposed in the center, connected to the first main bus 10 and the second main bus 20 at the front side of the circuit breaker container 31, The cable head 40 is connected to the side via a telescopic container 37.
This is a configuration in which the units shown in FIG.

Generally, in a gas insulated switchgear connected to an electric power system, it is quite common that only a circuit breaker is replaced due to replacement due to failure or aging, or replacement corresponding to a rating change due to an increase in substation capacity. As a gas insulated switchgear, the circuit breaker is configured to be removable. When replacing the circuit breaker in the configuration of FIG. 10, first, as shown in FIG. The insulating gas is recovered, the connection conductor 36 between the breaker section 30 and the cable head section 40 is removed, the telescopic container 37 is pulled out, and the breaker section 30 and the first main bus section 10 and the second main bus section are removed. The connection conductor 34 between the first main bus container 21 and the circuit breaker container 31 and between the second main bus container 21 and the circuit breaker container 31 are cut off, and the connection is cut off. The section 30 by moving the cable head unit 40 side, breaker portion 30 is removable.

[0006] The circuit breaker 32 can be removed by lifting the entire circuit breaker or by removing only the circuit breaker container 31.
Is disassembled and removed, but if it is installed in an underground substation or the like in the city center, a space for lifting the circuit breaker tank 31 above the gas insulated switchgear and moving it laterally is required. Yes, a high ceiling substation is required.

A first bus section 10 and a second bus section 20
When the insulating gas on the circuit breaker side is removed, the pressure resistance of the insulating spacers 15 and 25 between the circuit breaker part and the circuit breaker part 30 is insufficient due to the gas pressure on the bus side. It is necessary to reduce the pressure of the insulating gas in the section 10 and the second bus section 20, and when replacing the circuit breaker 32, it is necessary to stop the entire apparatus for a long time.

[0008] Further, the circuit breaker section 30 disposed at the center of the configuration of FIG. 10 is connected to the first bus section 10, the second bus section 20,
In order to remove the cable head portion 40 at the installation position, the telescopic container 37 is a necessary component, and the front and rear dimensions increase accordingly, and the use of the expensive telescopic container 37 increases the cost as a device. .

[0009]

In the conventional gas insulated switchgear described above, when replacing a circuit breaker due to failure, aging or a change in rating, the entire gas insulated switchgear must be stopped for a long time. Therefore, it is necessary to carefully plan the replacement of circuit breakers, and it may not be possible to replace circuit breakers in substations where shutdown is not possible.

Most gas-insulated switchgears designed on the premise that only the circuit breaker is removed in the installed state use an expensive telescopic container. In addition, there is also a problem that the installation space becomes large as an apparatus.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is necessary to replace a circuit breaker.
A gas-insulated switchgear that can be replaced without stopping the gas-insulated switchgear by stopping only the switchgear that replaces the circuit breaker. It is an object to provide a method for replacing a device and a circuit breaker.

[0012]

According to a first aspect of the present invention, there is provided a gas insulated switchgear having a circuit breaker connected to two sets of main buses arranged in two stages on the front side via a bus disconnector. The circuit breaker container of the switching unit equipped with the circuit breaker upper container and the circuit breaker lower container are connected, connected to the main bus arranged in the upper circuit breaker upper container part, and in the lower circuit breaker lower container part It is configured to be connected to the arranged main bus.

According to a second aspect of the present invention, there is provided a gas-insulated switchgear, wherein the connector of the circuit breaker upper container and the circuit breaker lower container of the first embodiment is connected by providing a connection flange inside the container.

According to a third aspect of the present invention, there is provided a method of replacing a circuit breaker of a gas insulated switchgear according to the first or second aspect.
Open each bus disconnector between the main bus arranged in the upper and lower two stages of the gas insulated switchgear described above and the breaker of the switching unit whose circuit breaker is replaced, stop the upper main bus and break the circuit breaker. Recover the insulating gas of the circuit breaker of the switching unit to be replaced and the upper main bus, open the top of the upper circuit breaker container, and connect the connection conductor between the circuit breaker and the bus disconnector connected to the upper main bus. Remove and disconnect the upper main bus container and the upper bus disconnector container to remove the circuit breaker upper container, attach the lid plate to the part of the upper main bus container from which the bus disconnect switch container has been removed, and seal it. Then, the upper main bus is charged by filling with an insulating gas, each part of the circuit breaker is removed, and a new or inspected circuit breaker is installed in a reverse procedure.

According to a fourth aspect of the present invention, there is provided a method for replacing a circuit breaker of a gas insulated switchgear according to the first or second aspect.
Opening each bus disconnector between the two sets of main buses arranged in the upper and lower stages of the described gas insulated switchgear and the circuit breaker of the switching unit in which the circuit breaker is replaced, stopping the upper main bus The insulating gas of the circuit breaker of the switching unit whose circuit breaker is replaced and the upper main bus is recovered, the top of the circuit breaker upper container is opened, and the circuit breaker is connected to the bus disconnector connected to the upper main bus. Remove the connection conductor, cut off the upper main bus container and the upper bus disconnector container, remove the circuit breaker upper container, attach the lid plate to the part of the upper main bus container from which the bus disconnect switch was removed, and seal it. Then, the upper main bus is charged by charging with the insulating gas, the lower main bus is stopped to collect the insulating gas, and the circuit breaker is provided between the lower main bus container and the lower main bus disconnector container. And the components behind the circuit breaker. Move the components behind the circuit breaker and circuit breaker to the opposite side of the main bus, attach a lid plate to the part of the lower main bus container where the bus disconnector is removed, seal it, fill it with insulating gas and fill the lower main bus. The battery breaker is removed after charging, and a new or inspected circuit breaker is installed in the reverse order.

According to a fifth aspect of the present invention, there is provided a gas insulated switchgear for shutting off a switchgear having a circuit breaker connected to two sets of main buses arranged on the front side in two stages through a bus disconnector. The circuit breaker container is configured by connecting the circuit breaker upper container and the circuit breaker lower container, and connected to the main bus arranged at the upper stage at the circuit breaker upper container, and to the main bus arranged at the lower stage at the circuit breaker lower container. The main buses arranged in the lower stage are detachable for each connected opening / closing unit.

According to a sixth aspect of the present invention, there is provided a method of replacing a circuit breaker of a gas insulated switchgear according to the fifth aspect, wherein two sets of main buses and a circuit breaker arranged in two upper and lower stages of the gas insulated switchgear are replaced. Open each bus disconnector between the circuit breakers of the switching unit to be replaced, stop the upper main bus, collect the circuit breaker of the switching unit whose circuit breaker is replaced and the insulating gas of the upper main bus, Open the top of the upper container, remove the connection conductor between the circuit breaker and the bus disconnector connected to the upper main bus, cut off the upper main bus container and the upper bus disconnect switch container and cut off Remove the upper container, attach the lid plate to the part of the upper main bus container from which the bus disconnector was removed, seal it, fill it with insulating gas, charge the upper main bus, and stop the lower main bus. To collect the insulating gas, and the lower main bus volume Disconnect and between the breaker and the unit constituent device container and the lower busbar disconnector vessel,
Remove the part to which the switching unit from which the circuit breaker of the lower main bus is removed is connected, remove the circuit breaker lower vessel and operating mechanism of the circuit breaker, carry it out from below the upper main bus, and make a new or The inspected circuit breakers are installed.

According to a seventh aspect of the present invention, there is provided a method of replacing a circuit breaker of a gas insulated switchgear, wherein the main bus arranged in two upper and lower stages of the gas insulated switchgear is replaced with a circuit breaker. Open the bus disconnectors between the circuit breakers, and shut off the upper main bus to recover the circuit breaker of the switching unit where the circuit breaker is replaced and the insulating gas of the upper main bus. Open the top part, remove the connecting conductor between the circuit breaker and the bus disconnector connected to the upper main bus, and disconnect the bus disconnector container connected to the upper main bus and the circuit breaker upper container. Remove the circuit breaker upper container, attach the lid plate to the part where the bus disconnector container connected to the upper main bus was removed, seal it, fill it with insulating gas, charge the upper main bus, and charge the lower main bus. Stop the main bus and turn on the insulating gas. Then, disconnect between the bus disconnector vessel connected to the lower main bus and the circuit breaker lower vessel and between the circuit breaker and the components behind the circuit breaker, and connect the circuit breaker and the components behind the circuit breaker to the main bus. Move to the opposite side, attach the lid plate to the part where the bus disconnector connected to the lower main bus has been removed, seal it, fill it with insulating gas, charge the lower main bus and charge the circuit breaker. A new or inspected circuit breaker is installed by removing and reversing the procedure.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows an example of a single-line diagram of a double bus system of a general receiving substation. FIG. 2 shows the configuration of the gas insulated switchgear of the line unit 52 in the single line diagram of FIG. In the figure, 51 is a gas insulated switchgear, 52 is a line unit connected to a receiving line, 53 is a bus unit, 54 is a transformer unit, 55 is a transformer,
Reference numeral 56 denotes a power receiving cable. 60 is the first main bus part, 6
1 is a first main bus container, 62 is a first main bus, 63 is a bus disconnector, 64 is a ground switch, 65 is an insulating spacer, 6
6 is a bus disconnector container. 70 is the second main bus part, 7
1 is a second main bus container, 72 is a second main bus, 73 is a bus disconnector, 74 is a ground switch, 75 is an insulating spacer, 7
Reference numeral 6 denotes a bus disconnector container, in which a first main bus portion 60 and a second main bus portion 70 are arranged on the front surface of the apparatus in two stages, upper and lower, and the first main bus portion 60 is disposed in an upper stage, The main bus part 70 is arranged at the lower stage.

Reference numeral 80 denotes a circuit breaker unit, and 81 denotes a circuit breaker container. The circuit breaker upper container 81a and the circuit breaker lower container 81b are connected. The circuit breaker upper container 81a is connected to the upper main bus part 60. The circuit breaker lower vessel 81b is connected to the lower second main bus 70. 82 is a blocking unit,
83 is a grounding switch, 84 is a bus disconnector 63 and an interrupter 82
, 85 is a current transformer, 86 is a connection conductor between the circuit breaker 82 and components behind the circuit breaker, and 88 is an insulating spacer. Reference numeral 90 denotes a unit component device on the line side of the circuit breaker unit 80, a cable head unit composed of a cable head, 91 a unit component container, 92 a cable head container, 93 a line disconnector, 94 a ground switch, 95 Is an instrument transformer, 97 is a cable head, and 99 is a cable head mount.

The main bus unit 53 and the transformer unit 54 shown in FIG. 1 have substantially the same configuration as the line unit 52 shown in FIG. Hereinafter, when each unit is referred to without specifying, it is referred to as an opening / closing unit.

If the breaker of the gas insulated switchgear of FIG. 2 needs to be replaced due to a change in rating, failure, aging, etc. of the circuit breaker, the circuit breaker is removed as shown in FIG. Reference numeral 68 in FIG. 3 denotes a cover plate. First, the first main bus section 60 in the upper stage is stopped, the first main bus grounding switch 58 is turned on, the first main bus 62 is grounded, and the first main bus section 60 and the cutoff are shut off. The insulating gas in the circuit section 80 is recovered, the top of the circuit breaker upper container 81a is opened, the connection conductor 84 between the bus disconnector 63 and the circuit breaker 82 is removed, and the first main bus container 61 and the bus disconnector The container 66 is cut off, and the circuit breaker upper container 81a and the bus disconnector 6 are connected as shown in the figure.
Remove part 3 in one piece. Subsequently, a cover plate 68 is attached to the opening of the first main bus container 61 from which the bus disconnector container 66 has been removed, and the lid is sealed. The first main bus container 61 is evacuated and filled with an insulating gas. Next, the first main bus grounding switch 58 is released to recharge the first main bus section 60. In this state, the gas-insulated switchgear 51 returns to a normal operation state except for the switchgear unit from which the circuit breaker 82 is removed.

As described above, the circuit breaker container 81 of the circuit breaker section 80
The configuration of the circuit breaker upper container 81a and the circuit breaker lower container 81b
Is connected, the circuit breaker upper container 81a can be removed without moving the circuit breaker as in the conventional structure, and the components of the circuit breaker can be removed without stopping the gas insulated switchgear. Can be.

The circuit breaker can be replaced by incorporating the parts of the newly-built or inspected circuit breaker by the reverse procedure.

The circuit breaker container 81 is connected to the circuit breaker upper container 8.
1a and the circuit breaker lower container 81b are connected to each other, and the circuit breaker upper container 81a is connected to the first main bus 6
0, and the circuit breaker lower container 81b is connected to the lower second main bus part, so that it is not necessary to move the position of the circuit breaker unit 80 when removing the circuit breaker. As described above, the structure does not require the telescopic container, and there is an advantage that the installation space of the gas insulated switchgear can be reduced accordingly.

In the first embodiment, as shown in FIG. 3, the main bus portion is a three-phase collective type, and
Although the cable head section has been described as a phase-separated type, the same effect can be obtained even if the main bus section, the unit constituent devices, and the cable head section are configured in a three-phase package.

The circuit breaker container 81 shown in FIG. 3 has a case where the circuit breaker upper container 81a and the circuit breaker lower container 81b are divided into two parts. However, the circuit breaker container 81 may be divided into three or more parts. Removal of the circuit breaker is also easier when the device is installed in a confined space.

Embodiment 2 In the first embodiment, the configuration of the connecting portion between the circuit breaker upper container 81a and the circuit breaker lower container 81b of the circuit breaker container 81 is not particularly specified, but in the second embodiment, the connecting portion of the circuit breaker container 81 is illustrated. As shown in FIG. 4, the inner flange type is used. 81 in the figure
c is a bolt, 81d is an upper lid, and 81f is a fixing bolt. As shown in the figure, the connection between the circuit breaker upper container 81a and the circuit breaker lower container 81b is formed with a flange on the inside, and the bolt 8
By connecting at 1c, there is no protruding portion to the outer peripheral portion, the interval between adjacent portions can be reduced, and the installation space of the gas insulated switchgear can be further reduced.

Embodiment 3 In the third embodiment, the circuit breaker of the gas insulated switchgear of FIG. 2 and the components behind the circuit breaker are moved to the opposite side of the main bus, and the circuit breaker and the lower main bus are separated from each other. Not only the container but also the operation mechanism can be removed. FIG. 5 is a diagram showing the situation of removing the circuit breaker. In the drawing, reference numeral 78 denotes a cover plate of the second main bus bar portion 70, and other portions are the same as those in FIG.

Next, a procedure for removing the circuit breaker according to the third embodiment will be described. First, the breaking part 82 of the switching unit from which the circuit breaker is removed is opened, and the bus disconnectors 63 and 73 are opened.
, The first main bus portion 60 is stopped, the first main bus grounding switch 58 is turned on to ground the first main bus 62,
The insulating gas of the first main bus section 60 and the circuit breaker section 80 is recovered, and the top of the circuit breaker upper container 81a is opened to open the top of the first main bus section 60 between the bus disconnector 63 and the cut section 82. The connection conductor 84 is removed, the first main bus container 61 and the bus disconnector container 66 are disconnected from each other, and the circuit breaker upper container 81a,
Bus disconnector 63, ground switch 64, insulating spacer 65,
The bus disconnector container 66 is removed in an integrated state, a lid plate 68 is attached to the opening of the first main bus container 61 from which the bus disconnector container 66 has been removed, and the first main bus portion 60 is sealed.
Is evacuated and filled with an insulating gas, the first main bus grounding switch 58 is opened, and the first main bus 62 is recharged.

Next, the second main bus 70 is stopped, the second main bus grounding switch 59 is closed, the second main bus 72 is grounded, and the insulating gas of the second main bus 70 is insulated. And disconnects the bus disconnector container 71 and the circuit breaker lower container 81b, moves the cable head section 90 and the circuit breaker section 80 to the side opposite to the main bus, and cuts off the second main bus section 70. Vessel part 80
Between the circuit breaker unit 80 and the unit component equipment container 91 of the cable head unit 90.
Next, the second main bus 70 is evacuated and filled with an insulating gas, the second main bus grounding switch 59 is opened to remove the ground, and the second main bus 70 is filled with the insulating gas. Then, the second main bus 72 is recharged. FIG. 5 shows the state at this time.

In the above state, each part of the breaking part 82
The circuit breaker lower container 81b and the operation mechanism 80a can be sequentially removed or can be removed integrally with the circuit breaker unit 80 including the bus disconnector 63.

In the reverse procedure, a new or inspected circuit breaker can be replaced by replacing the circuit breaker.

According to this method, the circuit breaker can be removed and installed while being separated from the main bus. In the preparation stage, the first main bus portion 60 or the second main bus portion 7
0 is in a stopped state, but for a short time,
As the gas insulated switchgear 51, the circuit breaker unit 8 in a state where both the first main bus unit 60 and the second main bus unit 70 are charged.
0 can be removed and installed, so that the reliability of operation of the gas insulated switchgear at the time of circuit breaker removal and installation is not impaired.

When a new breaker is replaced after the breaker unit 80 has been removed, the circuit breaker unit and the bus disconnector are integrally combined to perform a quality assurance test such as a withstand voltage test. Because it can be mounted on the removed part, there is no need to conduct on-site quality assurance tests, there is no cost involved in on-site testing, the construction period can be significantly reduced, and breakers can be replaced economically .

Embodiment 4 FIG. Embodiment 4 is a configuration for coping with a case where the circuit breaker cannot be lifted above the gas insulated switchgear at the time of removing the circuit breaker unit. FIG. 6 shows a state of removal of the circuit breaker. The configuration of the gas insulated switchgear is such that the configuration of the second main bus portion 70 at the lower stage of the main bus arranged in the upper and lower stages of the configuration of FIG. 2 is detachable for each portion to which the switch unit is connected. The other configuration is the same as the configuration in FIG.

Next, a procedure for removing the circuit breaker according to the fourth embodiment will be described. First, as in the case of the third embodiment, the breaking unit 82 of the switching unit from which the circuit breaker 82 is removed is opened to open the bus disconnectors 63 and 73, and the first main bus unit 60 is stopped. The first main bus grounding switch 58 is turned on to ground the first main bus 62 and the first main bus portion 60
And the insulating gas of the circuit breaker section 80 is recovered, the top of the circuit breaker upper container 81a is opened, and the connection conductor 84 between the bus disconnector 63 and the circuit breaker 82 on the first main bus section 60 side is removed. One main bus container 61 and the bus disconnector container 66 are disconnected from each other, and the circuit breaker upper container 81a, the bus disconnector 63,
Ground switch 64, insulating spacer 65, bus disconnector container 6
6 in an integrated state, and remove the first main bus container 6
The cover plate 6 is attached to the opening from which the bus disconnector container 66 is removed.
Then, the first main bus portion 60 is evacuated and filled with insulating gas, the first main bus grounding switch 58 is opened, and the first main bus 62 is recharged.

Next, the second main bus 70 is stopped, the second main bus grounding switch 59 is closed, the second main bus 72 is grounded, and the insulating gas of the second main bus 70 is , The bus disconnector container 71 and the circuit breaker lower container 81b are disconnected, and a portion connected to an open / close unit for replacing a circuit breaker of the second main bus portion 70 disposed at the lower stage is removed and removed. Attach a cover plate to the opening of the part to take dustproof measures.

Next, the components of the circuit breaker 82, the circuit breaker lower vessel 81b, and the operating mechanism 80a are sequentially removed, or the circuit breaker unit 80 is removed in an integrated state including the bus disconnector 63, and the first circuit breaker is removed. It passes through the lower part of the main bus part 60 and is carried out.

By installing a new or inspected circuit breaker by the reverse procedure, the circuit breaker can be replaced.

According to this method, the gas insulated switchgear during removal and installation of the circuit breaker is operated only by the first main bus section 60, while one second main bus section 70 is stopped. In the operation state of the gas-insulated insulated switchgear, the entire circuit breaker can be removed and installed.

Embodiment 5 FIG. In the first, third, and fourth embodiments, the method of removing the breaker is a method of integrally removing the bus disconnector together with the removal of the breaker. However, the bus disconnector does not need to be disassembled for replacement of the breaker. Absent. Embodiment 5 is an embodiment in the case where only the circuit breaker is removed with the disconnector portion attached to the main bus for replacement of the circuit breaker. 7 and 8 show situation diagrams when the circuit breaker of the fifth embodiment is removed. In the figure, 69, 7
9 is a cover plate. The configuration of the gas insulated switchgear is the configuration shown in FIG.

Next, a procedure for removing the circuit breaker according to the fifth embodiment will be described. First, in the same manner as in the third embodiment, the opening part 82 of the switching unit from which the circuit breaker 82 is removed is opened to open the bus disconnectors 63 and 73, the first main bus part 60 is stopped, and the first main bus part 60 is stopped. The main bus grounding switch 58 is turned on to ground the first main bus 62, the insulating gas of the first main bus section 60 and the circuit breaker section 80 is recovered, and the circuit breaker upper vessel 81
a, the connection conductor 84 between the bus disconnector 63 and the circuit breaker 82 on the first main bus portion 60 side is removed by opening the top portion of the first main bus portion 60, and the bus disconnector container 66 connected to the first main bus portion 60 The circuit breaker upper container 81a is disconnected from the circuit breaker upper container 8a.
1a is removed, a lid plate 69 is attached to the removed opening of the bus disconnector container 66, and the first main bus 6
0 is evacuated and filled with an insulating gas, the first main bus grounding switch 58 is opened, and the first main bus portion 60 is recharged.

Next, the second main bus 70 is stopped, the second main bus grounding switch 59 is closed, the second main bus 72 is grounded, and the insulating gas of the second main bus 70 is And the busbar disconnector container 71 and the circuit breaker lower container 81b are separated from each other, and as shown in FIG. 8, a cable head unit 90 including components behind the circuit breaker, a cable head, etc., and a circuit breaker. Part 80 is moved to the side opposite to the main bus, a lid plate 79 is attached to the opening of the bus disconnector container 76 removed and hermetically sealed, and then the second main bus part 70 is evacuated to remove the insulating gas. , The second main bus grounding switch 59 is opened to remove the ground, and the second main bus part 70 is recharged.

In the above state, each part of the circuit breaker 82
The circuit breaker lower vessel 81b and the operation mechanism 80a are sequentially removed, or the circuit breaker unit 80 is removed in an integrated state including the bus disconnector 63, and a new or inspected circuit breaker is installed in the reverse procedure. Allows the circuit breaker to be replaced.

According to this method, only the breaker unit 80 can be removed while the parts of the bus disconnectors 63 and 73 which are not directly related to the replacement of the breaker remain in the main bus part. By doing so, the bus disconnectors 63 and 73
The portion has no effect associated with the removal and attachment of the breaker unit 80, and has the advantage that the quality check such as a withstand voltage test after the replacement of the breaker is not required and the construction period of the replacement of the breaker can be shortened.

[0047]

The gas insulated switchgear according to the first aspect of the present invention is a switchgear having a circuit breaker connected to two sets of main buses arranged on the front surface in two stages by way of a bus disconnector. The circuit breaker container of (1) is constructed by connecting the circuit breaker upper container and the circuit breaker lower container, and connected to the main bus arranged at the upper part of the circuit breaker upper container part, and connected at the lower part of the circuit breaker lower container part. Since it is configured to be connected to the bus bar, when replacing the circuit breaker, the circuit breaker can be removed and installed without stopping the gas insulated switchgear.

In the gas insulated switchgear according to a second aspect of the present invention, the connector between the shut-off portion upper container and the circuit breaker lower container of the first aspect is connected by providing a connection flange inside the container. There is no projecting portion on the outer periphery of the container, so that the distance between adjacent portions can be reduced, and the installation space for the gas insulated switchgear can be further reduced.

According to a third aspect of the present invention, there is provided a method for replacing a circuit breaker of a gas insulated switchgear, comprising the steps of stopping an upper main bus and replacing a breaker by removing a circuit breaker upper container of the upper main bus and replacing the upper main bus. Put the lid on the removed opening,
The upper main bus was filled with insulating gas to charge the upper main bus and the lower main bus, and each part of the breaker was removed, and new or inspected breaker parts were installed in reverse order. Therefore, the gas insulated switchgear can remove and install each part of the circuit breaker while the two main buses are operating normally.

According to a fourth aspect of the present invention, there is provided a method for replacing a circuit breaker of a gas insulated switchgear, comprising: removing a circuit breaker upper container of a switching unit for stopping the upper main bus and replacing the breaker; Put the lid on the removed opening, fill the upper main bus with insulating gas and charge it, stop the lower main bus, and move the breaker and the components behind it in the opposite direction to the main bus side After disconnecting from the lower main bus, filling the separated part with a cover plate and filling it with insulating gas to make it charged, removing the breaker and installing a new or inspected breaker in the reverse procedure The circuit breaker can be removed and installed without affecting the gas-insulated switchgear.

According to a fifth aspect of the present invention, there is provided a gas insulated switchgear for shutting off a switchgear having a circuit breaker connected to two sets of main buses arranged on the front side in two stages through a bus disconnector. The circuit breaker container is configured by connecting the circuit breaker upper container and the circuit breaker lower container, and connected to the main bus arranged at the upper stage at the circuit breaker upper container, and to the main bus arranged at the lower stage at the circuit breaker lower container. The main bus located at the bottom is detachable for each connected switching unit, so even if the gas-insulated switch is installed in a narrow space with a low ceiling, the gas-insulated switchgear is stopped. The circuit breaker can be removed and installed without performing.

According to a sixth aspect of the present invention, there is provided a method of replacing a circuit breaker of a gas insulated switchgear, comprising the steps of: Put the lid on the removed opening, fill the upper main bus with insulating gas and charge it, stop the lower main bus, remove the breaker, remove the main bus of the switch unit, and remove the breaker. Remove the circuit breaker lower container and the operating mechanism, carry out from below the upper main bus,
A new or inspected circuit breaker is installed in the reverse order, so even if the gas-insulated switchgear is installed in a narrow space with a low ceiling, removal of the circuit-breaker without stopping the gas-insulated switchgear , Can be installed.

According to a seventh aspect of the present invention, there is provided a method for replacing a circuit breaker of a gas insulated switchgear, wherein the bus disconnector of the switching unit for stopping the upper main bus and replacing the breaker is left on the main bus side. Remove the upper container, cover the opening from which the upper main bus was removed, fill the upper main bus with insulating gas, charge it, stop the lower main bus, and connect the bus disconnector to the main bus side Move the circuit breaker and the rear component in the opposite direction to the main bus side and separate from the lower main bus, cover the separated portion with a cover plate and fill it with insulating gas to charge it, Removal and installation of a new or inspected circuit breaker by the reverse procedure removes the breaker section while leaving the bus disconnector that is not directly related to the breaker replacement in the main bus section. , Can be installed.

[Brief description of the drawings]

FIG. 1 is an example of a single line diagram of a gas insulated switchgear to which the present invention is applied.

FIG. 2 is a sectional view showing a configuration of a line unit of the gas insulated switchgear of the single line diagram of FIG.

FIG. 3 is a state diagram showing a state of removal of a circuit breaker of the gas insulated switchgear of the first embodiment.

FIG. 4 is a cross-sectional view illustrating a configuration of a circuit breaker container according to a second embodiment.

FIG. 5 is a situation diagram showing a situation where a circuit breaker of a gas insulated switchgear according to a third embodiment is removed.

FIG. 6 is a situation diagram showing a state of removing a circuit breaker of the gas insulated switchgear according to the fourth embodiment.

FIG. 7 is a situation diagram showing a situation where a circuit breaker of a gas insulated switchgear according to a fifth embodiment is removed.

FIG. 8 is a view showing a state in which a detachable circuit breaker of the gas insulated switchgear according to the fifth embodiment is disconnected.

FIG. 9 is a single line diagram of a conventional gas-insulated switchgear.

FIG. 10 is a cross-sectional view showing a cross section of a conventional gas insulated switchgear.

FIG. 11 is a view showing a state of removing the conventional gas-insulated switchgear circuit breaker shown in FIG. 10;

[Explanation of symbols]

51 gas insulated switchgear, 52 line unit, 53
Bus unit, 54 transformer unit, 58 first main bus ground switch, 59 second main bus ground switch, 60
First main bus portion, 61 First main bus container, 62 First main bus, 63 Bus disconnector, 64 Grounding switch, 6
5 insulating spacer, 66 bus disconnector container, 68 cover plate, 69 cover plate, 70 second main bus portion, 71 second main bus container, 72 second main bus, 73 bus disconnector,
74 ground switch, 75 insulating spacer, 76 bus disconnector container, 78 cover plate, 79 cover plate, 80 circuit breaker part,
81 Breaker container, 81a Breaker upper container, 81b
Circuit breaker lower container, 82 Breaker, 83 Ground switch, 8
4 connection conductor, 85 current transformer, 86 connection conductor, 88
Insulation spacer, 90 cable head part, 91 unit component equipment container, 92 cable head container, 93 line disconnector, 94 ground switch, 95 instrument transformer,
97 cable head, 99 cable head mount.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiyoichi Torimi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Kenji Terada 2-3-2 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Tsuyoshi Mori 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5G017 AA03 AA05 BB01 FF02 GG02 JJ01

Claims (7)

[Claims] 1. A gas insulation in which a plurality of switching units having two sets of main buses arranged in upper and lower stages on the front surface and a circuit breaker connected to the main buses via a bus disconnector are provided. In the switching device, the container of the circuit breaker of each switching unit is
The circuit breaker upper vessel and the circuit breaker lower vessel are connected to each other. The circuit breaker upper vessel is connected to the main bus arranged at the upper level, and the circuit breaker lower vessel is disposed at the lower level at the main bus. A gas insulated switchgear connected to the switch. 2. The gas insulated switchgear according to claim 1, wherein a connection portion between the upper circuit breaker container and the lower circuit breaker container is connected by providing a connection flange at an inner diameter portion of the container. 3. Opening each bus disconnector between two sets of main buses arranged in the upper and lower stages of the gas insulated switchgear according to claim 1 or 2 and a circuit breaker of a switchgear in which the circuit breaker is replaced. The upper main bus is stopped, the circuit breaker of the switching unit where the circuit breaker is replaced and the insulating gas of the upper main bus are collected, the top of the circuit breaker upper container is opened, and the breaker and the upper main bus are opened. Disconnect the connection conductor between the bus disconnector connected to the main bus container, disconnect the upper main bus container and the upper bus disconnector container, remove the circuit breaker upper container, and disconnect the disconnector container of the upper main bus container. Attach the lid plate to the part where the was removed, seal it, fill it with insulating gas, charge the upper main bus, remove each part of the breaker, and install a new or inspected breaker in the reverse procedure How to replace a breaker. 4. A bus disconnector between two sets of main buses arranged in the upper and lower stages of the gas insulated switchgear according to claim 1 and a circuit breaker of a switchgear having a circuit breaker replaced therewith. The upper main bus is stopped, the circuit breaker of the switching unit where the circuit breaker is replaced and the insulating gas of the upper main bus are collected, the top of the circuit breaker upper container is opened, and the breaker and the upper main bus are opened. Remove the connection conductor between the bus disconnector connected to the main bus container, disconnect the upper main bus container and the upper bus disconnector container, remove the upper circuit breaker container, and remove the bus disconnector of the upper main bus container. Attach the lid plate to the part where it was removed, seal it, fill it with insulating gas, put the upper main bus in a charged state, stop the lower main bus, and collect the insulating gas,
Disconnect between the lower main bus container and the lower bus disconnector container and between the circuit breaker and the components behind the circuit breaker, move the circuit breaker and the components behind the circuit breaker to the opposite side of the main bus, Attach a cover plate to the part where the bus disconnector of the lower main bus is removed, seal it, fill it with insulating gas, charge the lower main bus as well, remove the breaker, replace the new How to replace the breaker to install the breaker. 5. A gas insulation in which a plurality of switching units each having two sets of main buses arranged on the front surface in two upper and lower stages and a circuit breaker connected to the main buses via a bus disconnector are provided. In the switching device, the container of the circuit breaker of each switching unit is
The circuit breaker upper vessel and the circuit breaker lower vessel are connected to each other. The circuit breaker upper vessel is connected to the main bus arranged at the upper level, and the circuit breaker lower vessel is disposed at the lower level at the main bus. And a main bus arranged in the lower stage is configured to be detachable for each connected switching unit. 6. The gas insulated switchgear according to claim 6, wherein each of the bus disconnectors between the two sets of main buses arranged in the upper and lower stages and the circuit breaker of the switching unit in which the circuit breaker is replaced is opened. The main bus is stopped and the circuit breaker is replaced.The circuit breaker of the switching unit and the insulating gas of the upper main bus are collected.
Open the top of the circuit breaker upper container, remove the connection conductor between the circuit breaker and the bus disconnector connected to the upper main bus,
Separate the upper main bus container and the upper bus disconnector container to remove the circuit breaker upper container, attach a lid plate to the part of the upper main bus container from which the bus disconnector has been removed, and seal it tightly.
Filling the upper main bus with charging by charging the insulating gas, stopping the lower main bus and recovering the insulating gas, between the lower main bus container and the lower main bus disconnector container, and between the circuit breaker and the unit Separate from the component equipment container, remove the part where the open / close unit from which the lower main bus breaker is removed is connected, remove the breaker lower container and operating mechanism of the breaker, and carry out from below the upper main bus. How to replace a circuit breaker by installing a new or inspected circuit breaker in the reverse order. 7. Opening each bus disconnector between the two sets of main buses arranged in the upper and lower stages of the gas insulated switchgear according to claim 4 and the circuit breaker of the switching unit in which the circuit breaker is replaced. The main bus is stopped and the circuit breaker is replaced.The circuit breaker of the switching unit and the insulating gas of the upper main bus are collected.
Open the top of the circuit breaker upper container, remove the connection conductor between the circuit breaker and the bus disconnector connected to the upper main bus,
Disconnect between the bus disconnector container connected to the upper main bus and the circuit breaker upper container, remove the circuit breaker upper container, and attach the lid plate to the part where the bus disconnector connected to the upper main bus was removed. The upper main bus is charged by filling it with insulating gas, the lower main bus is stopped, the insulating gas is recovered, and the bus disconnector container and circuit breaker lower container connected to the lower main bus are closed. Between the circuit breaker and the components behind the circuit breaker, move the circuit breaker and the components behind the circuit breaker to the side opposite to the main bus, and connect to the lower main bus. Attach the lid plate to the part where the battery has been removed and seal it tightly, fill the insulating gas and charge the lower main bus, remove the breaker, and install the new or inspected breaker in the reverse order. How to replace.