JPS61227611A - Gas insulated switchgear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a gas insulated switchgear installed in an electrical station such as a substation.

[Conventional technology] Gas insulation r! installed in substations, etc. #Closing equipment refers to equipment necessary for configuring an open W1 circuit (referred to as equipment for configuring an open W1 circuit) such as circuit breakers, disconnectors, grounding devices, current transformers, etc.
It is constructed by storing it in a container filled with an insulating gas such as F6 gas.

This type of gas-insulated switchgear uses a container whose interior is divided into an equipment storage chamber and a drawer chamber, and stores equipment for configuring a switching circuit such as a circuit breaker and a grounding device in the equipment storage chamber of the container. A conductor connected to the part of the switching circuit connected to the transformer in the equipment storage chamber is guided into the drawer chamber through an insulating spacer attached to the wall that partitions the storage room and the exit room. There is a built one.

There are two ways to connect this type of gas insulated switchgear and a transformer: an air bushing connection method in which the gas insulated switchgear is connected to the transformer via an air bushing, and a gas insulated switchgear connected to the transformer through an air bushing. There is a direct connection method that connects to the transformer via a bushing for direct connection to the transformer.

Which connection method to use is determined by the configuration of the transformer. For example, if the existing transformer TR is a transformer equipped with an air bushing B1 as shown in Fig. 4, the air bushing B2 is attached to the top of the container A of the gas insulated switchgear GIS, and were connected by overhead wire F.

Although not shown, if the transformer TR is a direct connection type, a bushing for direct connection to the transformer is attached to the side of the container of the gas insulated switchgear, and the bushing for direct connection is passed through the gas insulated RF8 closing device. and the transformer.

As mentioned above, conventional gas-insulated switchgear was configured exclusively for the air bushing connection method or direct connection method, so it was not possible to change the connection method with the transformer, and the transformer was connected through the air bushing. It was not possible to connect a direct-coupled transformer to gas-insulated switchgear.

[Problems to be Solved by the Invention] Pneumatic bushings are greatly affected by weather conditions, and if the insulator becomes soiled, the insulation performance will decrease. In addition, the submerged bushing has low earthquake resistance, so it was inevitable that it would become a weak point in the event of an earthquake. Furthermore, when using an air bushing, it is necessary to ensure a large air insulation distance between phases and between adjacent units, which requires a large installation area of the device.

Furthermore, the use of aerial bushings gives the appearance of the device a complicated appearance, making it difficult to harmonize the equipment at the electric station with the urban environment.

On the other hand, if a direct connection method is used, it is not affected by weather conditions and the like, so reliability can be improved and maintenance labor can be saved. Furthermore, the direct connection method can improve safety because live parts are not exposed at the connection between the gas-insulated switchgear and the transformer, and the insulation distance between layers and between adjacent units can be shortened, so the equipment The installation area can be reduced by downsizing.

Therefore, when replacing a transformer to increase the capacity of a substation or when replacing an aging transformer, it is recommended to use a direct-coupled type that does not use air bushings as a new transformer. preferable.

However, as mentioned above, it was not possible to connect a direct connection type transformer to the conventional air bushing connection type gas insulated switchgear, so when updating the transformer, air bushings were used as a new transformer. It was not possible to change to the direct connection method, which has many advantages.

The object of the present invention is to solve the above-mentioned problems by
The aim is to provide a

(Means for solving the problem 3) As shown in FIG. 1 showing an embodiment of the present invention, the present invention includes a container 1 whose interior is gas-divided into at least a main equipment storage chamber 1B and a drawer chamber 1C. The main equipment storage room 1B includes switching circuit configuration equipment stored in the main equipment storage room 1B, and an insulating spacer 6 attached to the partition wall 4 that partitions the main equipment storage room 1B and the drawer room 1C. Conductor 1 connected to the part to be connected to the transformer of the switching circuit configuration equipment in JIB
A gas insulated switchgear 9 led into the drawer chamber 1C through an insulating spacer 6 can be connected to either an air bushing connection type or a direct connection type transformer.

Therefore, in the present invention, an air bushing mounting section 101 is provided in the upper part of the drawer chamber 1C, and a connection means for direct connection to the transformer is not mounted on the side wall of the drawer chamber 1C opposite to the main equipment storage chamber 1B. An opening 105 is provided.

[Operation of the invention] With the above structure, it is possible to connect a transformer of the air bushing connection type by attaching the air bushing to the part, and the installation of the transformer direct connection means is unnecessary. A direct connection type transformer can also be connected by connecting a connecting means such as a transformer direct connection bushing to the opening. Therefore, when updating an air bushing connection type transformer, a direct connection type transformer can be used as a new transformer.

Further, with the above configuration, when a direct-coupled transformer is connected, the transformer can be tested using the air bushing above the drawer chamber.

[Example] The present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 shows an embodiment of the present invention. In the figure, 1 is a box-shaped container, and this container 1 is supported on a box-shaped pedestal 2 that also serves as an operating box. has been done. The interior of the container 1 is divided by partition walls 3 and 4 into a drawer chamber 1A located on the front side (left side in Figure 1), a main equipment storage chamber 1B located in the center, and a drawer chamber 1C located on the back side. It is airtightly partitioned. Lead-in room 1A and main equipment storage room 1B
Insulating spacers 5 and 6 are respectively attached to the upper part of the partition wall 3 between the main equipment storage chamber 1B and the drawer chamber 1C.

Pneumatic bushing attachment parts 100 and 101, each consisting of a flanged short pipe welded to the container 1, are provided on the ceiling of the draw-in chamber 1A and the ceiling of the draw-out chamber 1G, respectively.
A submersible bushing 10 for pulling in a railway line is attached to an aerial bushing attachment section 100, and an aerial bushing 11 for connecting a transformer is attached to an aerial bushing attachment section 101.

A disconnector 081, a grounding device ES1, a lightning arrester LA, and a current transformer CT are housed in the lead-in chamber 1A. Disconnector D
One end of S1 is connected to the center conductor 17 inside the air bushing 10 via conductors 15 and 16, and the other end is connected to an embedded conductor provided through the insulating spacer 5. A lightning arrester LA and a grounding device ESI are provided between the conductor 15 and the ground, and a current transformer CT is attached to the conductor 16.

A hand hole 102 is provided in the front side wall of the drawing chamber 1A, and this hand hole is hermetically closed with M2O3.

In the main equipment storage chamber 1B, there are provided a gas circuit breaker CB, grounding devices 1Es2 and ES3 for circuit breaker inspection, and a disconnector O82. One end of the circuit breaker CB is connected to the disconnector DS1 via the connection conductor 18 and the embedded conductor of the insulated spacer 5, and the other end of the circuit breaker CB is connected to the disconnector DS2 and the connection conductor 19.
It is connected to a buried conductor provided through the insulating spacer 6 through the insulating spacer 6. The grounding device ES2 is provided between one end of the circuit breaker CB and the ground, and the grounding device MES3 is connected to the circuit breaker CB.
It is installed between the other end and ground.

The embedded conductor of the insulating spacer 6 is connected to the connecting conductor 2 in the drawer chamber 1C.
0, and the other end of the connecting conductor 20 is connected to the connecting conductor 2.
1 and 22 to the center conductor 23 of the air bushing 11
It is connected to the. One end of a connecting conductor 24 is also connected to the other end of the connecting conductor 20, and a grounding device ES4 is provided between the other end of the connecting conductor 24 and the ground.

A hole is provided in the lower part of the side wall of the drawer chamber 1C opposite to the main equipment storage chamber, and a short pipe 104 with 7 flanges is welded to the periphery of this hole, and the opening of the short pipe 104 is directly connected to the transformer. This is an opening 105 for attaching a connecting means. This opening 1
05 is set to a size that allows connection means such as a bushing for direct connection to a transformer or a connecting conductor to be inserted, and is removable! ! 1
06 is hermetically closed.

The draw-in chamber IA, main equipment storage chamber 1B, and draw-out chamber 1C in the container 1 are filled with SF6 gas at a predetermined pressure.

A circuit breaker CB is installed inside the box-shaped frame 2.

Operating devices for a disconnector and a grounding device are housed, and each operating device is connected to a predetermined device by an operating shaft that is slidably and airtightly penetrated through the bottom wall of the container 1.

A transformer TR is installed on the side of the gas insulated switchgear GIS configured as described above, and an air bushing 30 and an air bushing 11 are attached to the upper part of the container of this transformer.
and are connected via an overhead line F.

As mentioned above, the air bushing is installed in the drawer chamber 1C in part 10.
1 and an opening 105 for installing the transformer direct connection means, it is useful when increasing the number of digits in an electrical station that uses transformers using the aerial bushing connection method, or when installing an aging aerial bushing connection. When replacing a conventional transformer, a direct-coupled transformer can be used as the new transformer.

In this case, the circuit breaker CB in the main equipment storage +18 is opened, the gas in the drawer chamber 1C is recovered, and the lid 106 of the opening 105 is removed. As shown in FIG. 2, the gas-oil partition bushing 32 is attached to the insulating spacer 31 attached so as to fit through the opening 105, and the center conductor of the bushing 31 is connected to the conductor inside the drawer chamber 1C. Connect to the conductor 24 of. Next, a conduit 3 having a stretchable portion is attached to the insulating spacer 31.
3, and the other end of the pipe 33 is connected to a direct-coupled transformer TR' installed near the gas insulated switchgear GIS. Next, a hand hole (not shown) provided in the upper part of the conduit 33 is opened and a conductor 34 connecting the bushing 32 to the transformer TR- is inserted. After completing the connection work of the conductor 34, the hand hole of the conduit 33 is drilled and the inside of the conduit 33 is filled with insulating oil. Finally, the drawer chamber 1C is filled with SF6 gas to complete the connection work of the direct connection type transformer TR-.

After connecting the transformer TR- as described above, a test voltage is applied to the transformer TR= through the air bushing 11 to perform a withstand voltage test of the transformer TR.

After the voltage resistance test of the transformer TR' is completed, the SF6 gas in the drawer chamber 1C is extracted and the air bushing 11 is removed. Next, the conductors 21 and 22 connected to the pneumatic bushing 11 are removed from the drawer chamber 1C, and the pneumatic bushing is attached by closing the opening of the section 101 with a lid, and finally filling the drawer chamber 1C with SF6 gas. do. Then, the circuit breaker CB is turned on and the transformer TR' is connected to the grid.

As mentioned above, the air bushing is installed in the drawer chamber 1C in part 1.
01 and an opening 105 for attaching the transformer direct connection means, it is possible to connect both the transformer of the air bushing connection type and the transformer of the direct connection type. Therefore, when replacing an existing transformer with a transformer with a different connection method, the connection work can be easily performed without modifying the gas-insulated switchgear on-site, and the construction period can be shortened.

When replacing an air bushing connection type transformer with a direct connection type transformer, it is necessary to perform a withstand voltage test on the newly installed transformer as described above. Conventionally, in such cases, a test voltage application bushing was attached to the top of the transformer, and the test voltage was applied through the test voltage application bushing.

In this case, if the bushing for applying the test voltage is of a type that connects to the transformer's submerged conductor, it will be necessary to drain and refill the insulating oil in the transformer when installing the bushing, which will significantly slow down the work. It becomes troublesome. On the other hand, according to the present invention, the withstand voltage test of the transformer can be performed using the aerial bushing already attached to the upper part of the drawer v1C, so a bushing for applying the test voltage can be prepared separately. It is not necessary and can make the withstand voltage test easier.
The time required for the test can be shortened.

In addition, if an accident occurs with the transformer after replacing it with a direct-coupled transformer, you can deal with the emergency by attaching the bushing to section 101 and connecting it to another transformer. can.

When a gas insulated switchgear is connected to a transformer via an air bushing 11, an outdoor air insulation type current transformer such as an insulator type is used. Connect the current transformer CT- to the conductor 22 at the bottom of 11.
It can also be equipped with a gas insulation system.

In the above embodiment, the pipe line 33 is filled with insulating oil, but a gas-oil partition bushing that fills the pipe line with gas may also be used.

The equipment stored in each chamber of the container 1 is not limited to the above example, and can be changed as appropriate. For example, in the above example, the disconnector DS2 can be placed inside the drawer chamber 1C.

In the above embodiment, the inside of the container 1 is partitioned into a draw-in chamber, a main equipment storage chamber, and a drawer room, but in the present invention, it is sufficient that the inside of the container is partitioned into at least a main equipment storage room and a drawer room. The interior of the container 1 can be partitioned in any manner.

In the above embodiment, the gas-insulated switchgear draws in the overhead line using the air bushing 10, but it may also be configured to provide a cable head on the lead-in WIA to draw in the cable line.

In the above embodiment, the aerial bushing 11 is as follows:
It is also possible to use a split bushing that can be divided into an upper bushing 11a and a lower bushing 11b as shown in FIG. 3A. In this case, the upper bushing 11
a is attached from the outside of the container 1, and the lower bushing 11
b is attached from the inside of the container 1. The center conductor 23a of the upper bushing 11a and the lower bushing 11
It is provided so that it can be separated from the center conductor 23b of b.
When the upper bushing 11a is removed, the center conductor 23a is also removed from the center conductor 23b.

If such a bushing is used, after the withstand voltage test is completed and the gas inside the bushing 11 is recovered, the upper bushing 2a is removed and M2S is installed as shown in FIG. 3B, and the lower bushing 11b and the lid 35 are connected. Since it is only necessary to fill the space between them with gas, the number of gas traps to be processed can be reduced, and the time required for gas processing can be shortened.

[Effects of the Invention] As described above, according to the present invention, since the drawer chamber is provided with a section for installing an air bushing and an opening for installing a direct connection means for a transformer, a transformer using an air bushing connection method is provided. It can be connected to any type of transformer, including direct-coupled transformers, making it easier to replace an existing aerial bushing-connected transformer with a direct-coupled transformer. .

Further, with the above configuration, when a direct-coupled transformer is connected, the withstand voltage test of the transformer can be easily performed using the air bushing above the drawer chamber.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram showing one embodiment of the present invention, Figure 2 is a configuration diagram showing a state in which a direct-coupled transformer is connected to the gas insulated switchgear of Figure 1, and Figure 3A is FIG. 3B is a schematic sectional view of the main parts showing a modified example of the aerial bushing used in the present invention.
4 is a schematic cross-sectional view of the main part showing a state in which the bushing is removed from the same figure, and FIG. 4 is a side view showing a state in which a conventional gas insulated switchgear is connected to a transformer. 1...Container, 1B...Main equipment storage chamber, 1C...Drawer chamber, 101...Pneumatic bushing installation part, 105.
・・Transformer direct connection means installation opening, 4・・Partition wall, 6・・Insulation spacer, 11・・Air bushing, GIS・・Gas insulated switchgear, TR・・Transformer . Figure 3

Claims (1)

[Scope of Claims] A container whose interior is partitioned into at least a main equipment storage chamber and a drawer room for gas, a switching circuit configuring equipment stored in the main equipment storage chamber, and the main equipment storage chamber. an insulating spacer attached to a partition wall separating the main equipment storage chamber from the drawer compartment, and a conductor connected to a part to be connected to the transformer of the switching circuit configuration equipment stored in the main equipment storage compartment is provided with the insulating spacer. In the gas insulated switchgear which is led out into the drawer chamber through the drawer chamber, an air bushing mounting part is provided in the upper part of the drawer chamber, and a transformer is directly connected to a side wall of the drawer chamber located on the opposite side from the equipment storage chamber. A gas insulated switchgear characterized by being provided with an opening for attaching a connecting means.