JPS631524Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas insulated switchgear installed in a power distribution substation.

In distribution substations, among the equipment that makes up the substation, equipment that makes up the switching circuit that connects the power receiving line and the transformer, such as disconnectors, disconnectors, grounding devices, and lightning arresters, is insulated. A gas-insulated switchgear is used, which is housed in a container filled with gas. In conventional equipment of this type, each piece of equipment was housed in a separate pressure-resistant metal container, and the metal containers were connected to each other with insulating spacers, but this structure required many metal containers, so the structure There was a problem that it became complicated. Recently, an improved gas-insulated switchgear has been proposed that simplifies the structure and reduces the installation space by housing all the necessary equipment in a common outer shell.

By the way, as the configuration of a power distribution substation that receives power from two lines, various configurations are adopted depending on the load demand, from a two-line power receiving one-transformer configuration to a two-line power receiving three-transformer configuration. The conventional way of thinking is to design a substation by changing the arrangement of equipment and the structure of the outer shell for each different configuration of the switching circuit, and to create a gas-insulated switchgear with a different configuration for each switching circuit. It was composed. However, in this case, it is not possible to standardize containers and equipment, which increases manufacturing costs, and when adding more transformers in the future, it is necessary to replace the gas-insulated switchgear, making it unnecessary. It was the economy.

The purpose of this invention is to standardize the units in the improved gas-insulated switchgear as described above, so that two lines of power can be received by one line using a common unit.
The present invention is intended to be compatible with various configurations from a transformer configuration to a 2-line power receiving 3-transformer configuration.

First, to explain the structure of the present invention, the present invention has two points.
Line power receiving n (n is 1 to 3) Out of the equipment that makes up the distribution substation with a transformer configuration, the equipment that makes up the switching circuit that connects the power receiving line and the transformer is covered with an outer shell filled with insulating gas. In a gas insulated switchgear housed in a container, it is possible to accommodate various configurations from a two-line power receiving transformer configuration to a two-line power receiving three transformer configuration without changing the unit configuration. This is what I did.

Therefore, in the present invention, first and second outer shell containers having the same structure are provided as outer shell containers. In each outer shell, the equipment constituting the circuit for the one-line power receiving two-transformer configuration is housed in substantially the same arrangement for three phases, and one power receiving line connection is provided on the side wall of each outer shell. , two transformer connections, and one busbar connection, respectively, are arranged for three-phase distribution, and the first and second unit is configured. The power receiving line connection portion, each transformer connection portion, and the busbar connection portion of the first and second units are provided at the same location on the side walls of the first and second outer shell containers, respectively. At least one of the total of four transformer connections provided in the substation is used to connect the transformer of the substation. Of the transformer connections of the first and second units, those that are not used for connecting transformers are connected to potential transformers or are fitted with blind covers.

As mentioned above, the switching circuit of the 2-line power receiving 3-transformer configuration is divided into the circuit for the 1-line power receiving 2-transformer configuration,
When the first and second units are configured by housing the circuits in the first and second outer shells having the same structure, the same unit can be used to convert the 2-line power receiving 1-transformer configuration to the 2-line power receiving 3-transformer configuration. It can accommodate various circuit configurations up to opening/closing circuits. Therefore, regardless of the configuration of the on-site substation, from a two-line, one-transformer configuration to a two-line, three-transformer configuration, the factory must install first and second units of substantially the same configuration. It is only necessary to assemble the unit, and it is possible to standardize the unit and reduce manufacturing costs. Furthermore, even if a two-line power receiving circuit with one transformer configuration or a two-line power receiving circuit with one transformer configuration is initially adopted, if demand increases in the future, transformers can be added without changing the unit configuration. can. Furthermore, if two units with one-line power receiving, two-transformer configuration circuits are installed, there will be an extra number of transformer connections, and even if a two-line power receiving, three-transformer configuration is used, there will be one extra transformer connection. The remaining transformer connection portion can be used to connect an instrument transformer. Also, since there is enough space for the transformer connections, the location of the transformer can be changed from the first unit side to the second unit side, or conversely from the second unit side to the first unit side. This increases the degree of freedom in the layout of substation equipment. Furthermore, since the unit can be standardized, if an accident occurs after installation, parts can be quickly replaced, the equipment can be repaired in a short time, and the power outage time can be shortened.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The gas insulated switchgear of the present invention will be explained in detail below with reference to the illustrated embodiments.

FIG. 1 is a single line diagram showing an embodiment of the present invention.
Each of the switching circuits (circuits consisting of the necessary equipment excluding transformers Tr1 to Tr3 and potential transformer GPT) required for the configuration of the three line power receiving transformers is one
The first circuit has a circuit configuration for line receiving two transformer configurations.
and a second circuit 1 and 1', and the equipment constituting the first and second circuits is housed in substantially the same case in first and second outer shell containers 2 and 2' having the same structure, respectively. The first and second units 3 and 3' are housed in this arrangement. The first circuit is
The unit to which the first power receiving line 1L is connected,
CHd ₁ is the cable head as the power receiving line connection part,
CHd ₂ is a cable head serving as a bus connection to which a bus BUS connecting the first and second units is connected. CHd ₃ is a cable head used as a transformer connection or a connection for a potential transformer PT; in the illustrated example, a gas-insulated potential transformer GPT is connected to this cable head CHd ₃ . Further, BS is a gas-oil division bushing as a transformer connection part, and this bushing is connected to the transformer Tr ₁ installed near the outer shell vessel 2. Cable head CHd ₁ of each phase is connected to disconnector DS ₁
The other end of the shroud breaker CB is connected to the bushing BS through disconnectors DS ₂ and DS ₃ . The connection point between the disconnectors DS ₂ and DS ₃ is a branch point of the first circuit 1, which is connected to the cable head CHd ₂ via the disconnector DS ₄ .
and to the cable head CHd ₃ via a disconnector DS ₅ . A voltage detection device VD is arranged close to the conductor leading to the cable head CHd ₁ , and a lightning arrester LA is installed between the conductor part between the cable head CHd ₁ and the disconnector DS ₁ and the ground.
is installed. A grounding device ESW ₁ is provided between the conductor connected to the input side of the disconnector DS ₁ and the ground,
Grounding devices ESW ₂ and ESW ₃ are installed between both ends of the shield breaker CB and the ground. In addition, a grounding device ESW 4 is provided between the conductor connecting the disconnector DS ₃ and the bushing BS and the ground, and a grounding device ESW ₄ is provided between the conductor connecting the disconnector DS ₄ and the cable head CHd ₂ and the ground.
ESW ₅ , but also disconnector DS ₅ and cable head CHd ₃
A grounding device ESW ₆ is provided between the conductor connecting the ground and the ground.

The second unit 3' is a unit to which the second power receiving line 2L is connected, and in this embodiment has the same configuration as the first unit 3.
In the figure, parts that are the same as those of the first unit 3 are indicated by the same symbols used for the first unit with a dash added. The gas-oil section bushing BS' of the second unit 3' is connected to the transformer Tr ₂ , and the cable head CHd ₃ ' is connected to the transformer via a cable.
Connected to Tr ₃ . and cable head
Bus line BUS is connected to CHd ₂ , which allows the first
and second units 3 and 3' are interconnected to form a two-line power receiving three-transformer.

As mentioned above, both the first unit 3 and the second unit 3' have a circuit configuration that can configure two single-line power receiving transformers, and the first unit 3 configures one single-line power receiving transformer. . In addition, the second unit 3' constitutes a single-line power receiving two transformer, and the branch points of the circuits of the first and second units are connected to the bus line.
By connecting via BUS, 2-line power reception 3
Configure the transformer. With this configuration, the first
and the second unit are standardized, and with this standardized unit, 2-line power receiving from 1 transformer to 2
It is possible to configure various capacities of up to three line power receiving transformers. In other words, in order to configure one transformer for two-line power receiving using the unit of the embodiment shown in FIG.
Connect Tr ₁ and bushing of second unit 3'
The attachment parts of BS' and cable head CHd ₃ ' may be closed with blind plugs. In addition, 2 lines power reception 2
To configure a transformer, for example, from Fig.
Except for Tr ₃ , it is sufficient to close the attachment part of the cable head CHd ₃ ' with a blind plug.

2 and 3 show an embodiment embodying the configuration shown in FIG. 1, and FIGS. 2 and 3 show a first unit 3 and a second unit, respectively.
Unit 3' is shown. Note that these figures are 1
Although only the arrangement of the equipment for each phase is shown, in reality, the equipment for three phases is arranged in a similar arrangement in a direction perpendicular to the plane of the paper. Since the first and second units 3 and 3' are constructed in exactly the same way, the structure of the first unit 3 will be explained, and the structure of the second unit 3 will be explained.
Parts of the first unit that are equivalent to the first unit are given the same reference numerals with a dash added.

In FIG. 2, the outer shell container 2 is an airtight container constructed by welding steel plates or steel materials so as to have a substantially rectangular parallelepiped shape as a whole. This outer shell container is connected to a base 5 made of concrete or the like via a base 4.
The insulating gas such as SF ₆ is sealed inside at a predetermined pressure. One side wall 2a of the outer shell container 2 is formed into a flat plate shape, and an operating device box 6 having a door 6a is attached to this side wall 2a by welding or the like. One end of a branch pipe 7, which collectively stores three phases of gas-oil classification bushings BS, is fluid-tightly connected to the part of the side wall 2a above the operating box 6 by means of bolts, etc., and each bushing
The BS is disposed so as to pass through a mounting hole 8 formed in the side wall 2a, and is connected to the periphery of the mounting hole 8 in an air-tight and liquid-tight manner. The lower part of the side wall 2b facing the side wall 2a of the outer shell container 2 is bent in a step-like manner so that protrusions 9A, 9B, and 9C extending in the horizontal direction and each having a dogleg-shaped cross section are lined up from the bottom to the top. . A hole 10 is provided in the inclined plate portion of the protruding portion 9A located at the lowest position and inclined toward the base 5 side, a cylinder 11 is welded to this hole, and a mounting hole 12A is opened in the end wall of this cylinder 11. has been done. Also, the protrusion 9B
Attachment holes 12B and 12C are provided in the inclined plate portion of 9C that is inclined toward the base 5 side, and attachment holes 12D are also provided in the portion of the side wall 2b located above the protruding portion 9C.
has been established.

Among the devices shown in FIG. 1, the lightning arrester LA is inserted into the outer shell container 2 through the mounting hole 12A provided in the lowermost protrusion 9A, and the mounting flange 13 provided at the end thereof is inserted into the mounting hole 12A. It is hermetically connected to the periphery of 12A. Also cable head
CHd ₁ to CHd ₃ are inserted into the outer shell container 2 through the mounting holes 12B to 12D, respectively, and the mounting flanges 13 provided at the ends thereof are connected to the mounting holes 12B to 12.
It is attached by airtightly connecting it to the periphery of D. The cable heads CHd ₁ to _{CHd 3} are slip-on types that allow the cable to be attached and detached from the outside of the outer shell.
CHd ₁ and CHd ₂ each have a first power receiving line.
Connectors 14 and 15 attached to the ends of the 1L cable and the bus BUS cable are connected. Further, the cable head CHd ₃ is connected to a connecting portion 17 of a gas-insulated voltage transformer GPT, which is housed in an airtight container 16 filled with an insulating gas such as SF ₆ .

The burner breaker CB houses a fixed contact, a movable contact, and an arc extinguishing mechanism in an airtight container 20 filled with an arc-extinguishing insulating gas such as SF ₆ , and one end of the container 20 is attached to a side wall 2a. The other end is supported on the bottom wall 2c of the outer shell via an insulating support 21 such as a support insulator. The operating rod of this shingle breaker CB passes airtight through the side wall 2a and is connected to an operating mechanism disposed within the operating box 6. The container 20 of the breaker CB has an electrode 2 connected to a fixed contact.
2, 23 and an electrode 24 connected to the movable contact.
25 is provided, and shields 26 and 27 are connected to the electrodes 22 and 24 provided above, respectively, and the shields 26 and 27 are each connected to a disconnector.
Movable contacts 28 and 29 of DS ₁ and DS ₂ are supported so as to be movable up and down. The fixed contacts of the disconnectors DS ₁ and DS ₂ are provided in shields 30 and 31 arranged above the shields 26 and 27, and the operating shafts a ₁ and a ₂ provided in the shields 26 and 27 are rotated. By moving the movable contacts 28 and 29 up and down, the disconnectors DS ₁ and DS ₂ can be opened and closed. The shields 30 and 31 are connected by an insulating support 32, and the shield 31 is supported by the side wall 2a via the insulating support 33.
Shield 3 with fixed contacts of disconnector DS ₁
0 is connected to the upper end of the dogleg-shaped conductor 35,
The lower end of this conductor 35 is supported by the bottom wall 2c via an insulating support 36. The conductor 35 is provided with a conductor connection portion 35a, and a connection conductor 37 on the non-grounded side of the lightning arrester LA is detachably connected to the conductor connection portion 35a. One end of a conductor 38 extending toward the cable head CHd ₁ is connected to the upper end of the conductor 35, and a connecting conductor 39 of the cable head CHd ₁ is detachably connected to a conductor connection portion 38a provided at the other end of the conductor 38. ing. A grounding device electrode 40 is provided at the lower end of the connecting conductor 35, and the grounding device ESW ₁ is constituted by this electrode 40 and a movable electrode 42 pivotally supported on the bottom wall 2c via a bracket 41. Moreover, the electrodes 23 and 25 provided on the lower side of the container of the disconnector CB are also formed to constitute fixed electrodes for the grounding device, and are supported by brackets 43 and 44 between these electrodes and the bottom wall 2c. The movable electrodes 45 and 46 constitute grounding devices ESW ₂ and ESW ₃ , respectively.

The lower end of a conductor 47 extending in the vertical direction is connected to the shield 31 of the disconnector DS ₂ , and the shield 48 is connected to the upper end of this conductor 47, and the shield 48 is supported by the side wall 2a via an insulating support 49. . A movable contact 50 of the disconnector DS ₃ is supported by the shield 48 so as to be movable up and down, and a fixed contact of the disconnector DS ₃ is provided in the shield 51 connected to the center conductor of the bushing BS. shield 51
A fixed electrode 52 of a grounding device ESW ₄ is provided at the upper end, and a movable electrode 53 of this grounding device is supported via a bracket 54 on the ceiling wall 2d of the outer shell container.

The disconnector DS ₄ includes a movable contact 57 supported by a shield 56 connected to the shield 48 via a conductor 55, and a shield 58 supported by an insulating support (not shown) on the side wall of the outer shell container parallel to the plane of the paper. and a fixed contact provided within the shield 5.
Connect the cable head to the conductor connection 59 provided at 8.
A connecting conductor 60 of CHd ₂ is detachably connected. The shield 58 is also provided with a fixed electrode 61 of a grounding device ESW ₅ , and a movable electrode 6 of this grounding device.
2 is supported via a bracket 64 on a frame 63 which is electrically and mechanically connected to the side wall of the outer shell container.

Further, the disconnector DS ₅ consists of a movable contact 66 supported by a shield 65 and a fixed contact provided in a shield 67. The shield 65 is connected to the shield 56 of the disconnector DS ₄ , and the shield 67
is supported by the ceiling wall 2d via an insulating support 68. The shield 67 is a conductor 6 extending in the horizontal direction.
9 to the cable head CHd ₃ , and in the middle of the conductor 69 a fixed electrode 70 of the earthing device ESW ₆ .
is provided. Movable electrode 7 of the earthing device ESW ₆
1 is supported by the ceiling wall 2d via a bracket 72. And the operation axis a ₁ of disconnector DS ₁ ~ DS _{5 ~}
a ₅ and the operating shafts b ₁ to b ₆ of the grounding devices ESW ₁ to ESW ₆ are connected to the operating mechanism in the operating box 6 via a transmission mechanism (not shown), and each disconnector and grounding device can be connected from inside the operating box. It is now possible to operate it. It goes without saying that the portion of the transmission mechanism that passes through the side wall of the outer shell container is hermetically sealed.

The gas oil division bushing BS of the first unit ₃ shown in FIG. There is.

The second unit 3' shown in FIG. 3 is constructed similarly to the first unit 3, but the cable head CHd ₃ ' of this second unit 3'
A cable 80 leading to Tr ₃ is connected.
Further, one end of the gas-oil section bushing BS' is connected to an oil-immersed transformer Tr ₂ (not shown). 1st and 2nd
Both units are connected to each other by a bus line BUS.

In the embodiment shown in Figs. 2 and 3,
When reducing to a two-line receiving two-transformer configuration,
For example, the cable can be removed from the cable head CHd3' in Fig. ₃ and the opening can be closed with a plug. To configure a two-line receiving one transformer, the branch pipe 7 or 7' and bushing BS or BS' in Fig. 2 or 3 can be removed and the bushing mounting hole 8 or 8' can be closed with a plug. In other words, a two-line receiving one transformer can be configured with a common unit.
The system can be made up of a transformer, two-line power receiving three-transformer configuration, and each unit can be standardized, which makes manufacturing easier and reduces costs.

In the above embodiment, the first and second units have exactly the same configuration, but it is not necessary that both units have exactly the same configuration, and if one unit has unnecessary equipment. It is also possible to change part of the arrangement of the equipment, such as by removing the equipment, as long as it does not significantly impede the standardization of the equipment. For example, disconnect the connection to a gas-insulated potential transformer GPT.
If this is done via a DS ₄ , the disconnector DS ₅ and the grounding device are connected from the first unit as shown in Figure 4.
ESW ₅ is removed and shield 58 of disconnector DS ₄ is connected via conductors 80 and 81 to cable head CHd ₃ . In this case fixed electrode 7 of the earthing device ESW ₆
0 is provided on the connector 82 that connects the conductors 80 and 81.

In the embodiment described above, the positions of the cable head CHd ₁ and the lightning arrester LA can be exchanged, and similarly the positions of the cable head CHd ₁ ' and the lightning arrester LA' can also be exchanged.

In the above embodiment, the cable heads CHd ₁ , CHd ₂
Although the cable heads CHd ₁ ' and CHd ₂ ' are mounted obliquely, these cable heads can also be mounted horizontally in the same way as the cable heads CHd ₃ and CHd ₃ '.

Although the cable heads CHd ₃ and CHd ₃ ' are shown as being different from the other cable heads in the example shown in FIGS. 2-4, it is also possible for all the cable heads to be of the same construction.

Further, the position of the operating device box 6 is not limited to the above embodiment. For example, as shown in FIG. A box 6 may also be attached.

It goes without saying that the types and arrangement of devices housed within the outer shell container are not limited to the above example.

As described above, according to the present invention, 2-line power receiving 3
The first and second units can be separated by dividing the switching circuit of the transformer configuration into a circuit for one-line power reception and two-transformer configuration, and storing the circuits in the first and second outer shell containers of the same structure. Now, using the same unit, you can change from the 2-line power receiving 1 transformer configuration to the 2-line power receiving 3
It can accommodate various circuit configurations up to switching circuits with transformer configurations. Therefore, regardless of the configuration of the on-site substation, from a two-line, one-transformer configuration to a two-line, three-transformer configuration, the factory must install first and second units of substantially the same configuration. It has the advantage that all it has to do is to assemble it, and the manufacturing cost can be reduced by standardizing the unit.
Furthermore, even if a circuit with a two-line power receiving one transformer configuration or a two-line power receiving two-transformer configuration is initially adopted, if demand increases in the future, transformers can be added without changing the unit configuration. I can do it.

Furthermore, in the present invention, by providing two units each having a circuit with a one-line power receiving, two-transformer configuration, there is a margin in the number of transformer connections, and even when a two-line power receiving, three-transformer configuration is used, the transformer Since there is one extra connection, the potential transformer can be connected using this extra transformer connection. Also, since there is enough space for the transformer connections, the location of the transformer can be changed from the first unit side to the second unit side, or conversely from the second unit side to the first unit side. This increases the degree of freedom in the layout of substation equipment. Furthermore, since it is possible to standardize units, in the event of an accident after installation, parts can be quickly replaced, equipment can be repaired in a short time, and power outages can be shortened. be.

[Brief explanation of the drawing]

FIG. 1 is a single line diagram showing an embodiment of the present invention.
Figures 2 and 3 are the first diagrams used in this invention, respectively.
FIG. 4 is a sectional view showing a modification of the first unit, and FIG. 5 is a cross-sectional view showing a modification of the first unit, and FIG. 5 shows a change in the position of the operating box in the example shown in FIG. It is a top view which shows an example of the external appearance in the case. 1...first circuit, 1'...second circuit, 2...
...First outer shell container, 2'... Second outer shell container, 3
...first unit, 3'...second unit,
CHd ₁ ~ _{CHd 3} , CHd ₁ ′ ~ CHd ₃ ′...Cable head, BS, BS'...Gas oil classification bushing, CB,
CB′...Shield disconnector, DS ₁ ~ DS ₄ , DS ₁ ′ ~ _{DS 4} ′...
Disconnector, ESW ₁ ~ ~ ESW ₆ , ESW ₁ ′ ~ ESW ₆ ′...
Grounding device, LA...surge arrester, GPT...gas insulated potential transformer, Tr ₁ to _{Tr 3} ...transformer.

Claims (1)

[Scope of Claim for Utility Model Registration] Among the equipment constituting a distribution substation with a two-line power receiving n (n is 1 to 3) transformer configuration, equipment constituting a switching circuit that connects a power receiving line and a transformer. in a gas-insulated switchgear, in which a first and a second outer shell container having the same structure as the outer shell container are provided, and a first and second outer shell container having the same structure as the outer shell container are provided; The equipment constituting the circuit for the one-line power receiving two-transformer configuration is housed in a substantially identical arrangement for three phases, and one
Three power receiving line connections, two transformer connections, and one bus connection are provided for three-phase distribution, and each of the first and second outer shell containers and the equipment housed therein are connected to each other. 1 and a second unit are configured, and the power receiving line connection section, each transformer connection section, and the busbar connection section of the first and second units are respectively connected to the first and second units.
and at the same location on the side wall of the second outer shell, at least one of the total of four transformer connections provided in the first and second units is used to connect the transformer of the substation. Of the transformer connections of the first and second units, the transformer connections that are not used for connecting a transformer are connected to an instrument transformer or are fitted with a blind cover. A gas insulated switchgear characterized by: