JPH0695802B2 - Gas insulated composite switchgear - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gas-insulated composite switchgear, and more particularly to a gas-insulated composite switchgear that can be used in an existing air-insulated substation.

[Conventional technology]

As the operation system of a recent substation, the circuit breaker, disconnector, current transformer, lightning arrester, busbar, etc. that compose the substation are integrated and housed in an airtight container. A complete gas-insulated switchgear (hereinafter abbreviated as GIS) that aims to reduce the size of the entire substation by filling it with a highly insulating and highly arc-extinguishing gas such as sulfurized gas (hereinafter abbreviated as SF ₆ gas). The bus bar is a gas insulated composite switchgear (hereinafter abbreviated as GCS) that is linked to each gas insulated switchgear by bushing by adopting an aerial method, and a conventional air insulation method.

Fig. 5 shows the general structure of a conventional air-insulated substation, and the upper busbars 1 and 2 busbars 2 of the double busbar system arranged to secure the required insulation distance L are respectively It is connected to the service line 5 via the breakers 3 and 4. The service line 5 passes over the upper bus 1 and is connected to an air circuit breaker (hereinafter abbreviated as ABB) 6. From ABB 6, a power transmission line (or an electric device such as a transformer installed in the vicinity) and a connection line 7 are connected. Connected. On the transmission line side of the ABB6, an accessory device 8 such as a lightning arrester or a transformer for instrumentation is provided via a disconnecting switch 9 as necessary.
Connect and configure. At the substation, the three-phase feeders with this arrangement are arranged in parallel with the busbar direction. In the case of the double busbar type of the air insulation type substation of this kind, upper steel towers 13, 14, 15 are provided on the lower steel towers 10, 11, 12 for supporting the service wire 7 on the busbars.

By the way, recently, it was used in an air insulation type substation.
The use of a gas circuit breaker (GCB), which is more reliable than that of ABB, and the installation of GCS that integrates substation equipment with GCB are changing in order (see Japanese Patent Publication No. 51-30256).

Therefore, in air-insulated substations, which are obsolete, it is also required to upgrade the installed substation equipment to GCS that allows the busbars and existing service towers to be used as they are.

Fig. 6 shows an example of a normal GCS installed in a substation, which is installed in the space of the lower towers 10 and 12 and the upper towers 13 and 15 into which the insteps A and Obus 1 and 2 are drawn. In this GCS, one side of the GCB 20 having a shut-off portion housed in a tank is connected to a power transmission line or the like by a connection line 7 via a disconnector 23 and a bushing 24, which are the power line side, and the other side is connected. Bus lines 25 and 26 are provided in the insulating space to provide bushings 25 and 26. Bus line side disconnectors 21 and 22 are installed in order, and a current transformer and a ground switch are built in.
Connect 1 and 2 to use.

When the ABB use structure of the air-insulated substation is updated to GCS, the function of the substation is maintained, that is, it is updated for each feeder in a short time so as not to stop it, and the conventional installation foundation is used. It is necessary to use equipment as it is.

[Problems to be solved by the invention]

However, in the GCS arrangement as shown in FIG. 6, since the connecting wire 7 is arranged between the upper bus 1 and the steel tower 10, the air insulation distance between them is required, and the upper and second bus lines 1 and 2 are connected. Since it is not suitable for the bus bar method to be evenly arranged and each device is arranged in a straight line, the installation foundation with the ABB method is not sufficient, so a special installation base is required and it becomes complicated, It is necessary to take measures such as earthquake resistance and vibration during GCB operation.

For this reason, it is possible to use the foundations of existing aerial transformers and effectively use the service tower and overhead bus without restrictions in the installed state.
B structure is desired.

An object of the present invention is to provide a GCS that can be easily renewed in a short period of time by making maximum use of conventional structures and the like in the GCS of an air-insulated substation.

[Means for solving problems]

In the present invention, one end of the GCB that houses the shut-off portion is connected to a disconnector that establishes a bushing, and the other ends of the GCB each have two busbar-side disconnections that establish a bushing that connects to an air-insulated busbar. When connecting GSCs in series to form a GCS, divide into a GCB part that connects one disconnector to one end and two busbar-side disconnector parts, and install both parts in parallel and It is characterized by being combined.

[Action]

In this way, by constructing the GCS with the GCB part and the two busbar-side disconnector parts, it is possible to renew the substation of the air insulation type without any trouble.

〔Example〕

The GCS of the present invention will be described with reference to the embodiment shown in FIGS.

In the air-insulated double bus-type substation, the lower steel towers 10, 11, 12 each having the upper steel towers 13, 14, 15 are connected to the lower bus towers 10, 11 and 11 and 12 between the Ko Bus 1 and The double busbars of the Otsu bus 2 are arranged with a predetermined insulation distance maintained. According to the present invention, the GCS of each phase arranged in this double bus substation is constructed as described below. As shown in FIG. 1 and FIG. 2, this GCS has a branch busbar 27 between the gas circuit breaker 20 and a disconnector 23 portion connected to one end in the longitudinal direction, and two busbar side disconnectors 21 and 22. It consists of two combinations of the connected disconnector unit part arranged in parallel, and each phase component is connected to the busbar 1, 1 They are installed in order in the pull-in direction. The bushing 24 established in the disconnector 23 is provided at a position corresponding to the lower side of the steel tower 14 so as to reach the power transmission line 28 by the connecting line 7. Moreover, the bushing 24 is disconnected from each busbar side when viewed from the side as shown in FIG. Arranged by using a branch busbar 27 that is set up in the vessels 21 and 22 and is set approximately in the middle of the bushings 25 and 26 that are connected to the instep busbar 1 and the Otsu busbar 2 in consideration of the insulation distance. Thus, the entire GCS of each phase can be installed collectively within a certain range without changing the steel tower structure.

The gas circuit breaker 20 and disconnector 23 that form part of GCS are
An installation foundation configured as shown in FIG.
Install on top of 29. The gas circuit breaker 20 accommodates the circuit breaker 20A inside, and is connected to a disconnector 23 that divides the gas by an insulating spacer 32 at one end side in the longitudinal direction, and a disconnecting portion 23A of the disconnector 23 is movable. A child that moves horizontally as shown by an arrow or vertically moves is appropriately used. In this example, the auxiliary conductor 15 such as a lightning arrester or a transformer on the transmission line side is connected to the central conductor 24A of the bushing 24 connected to the disconnecting portion 23A via the gas-insulated buses 33 and 34. Is appropriately installed in the lateral space of the disconnector 23. In this gas circuit breaker 20, a connection portion 32 with a juxtaposed disconnector unit is provided on one of the side surfaces on the other end side in the longitudinal direction, and electrical connection is made by a conductor 31 arranged inside. I have to. The connecting portion 32 has a structure in which the gas is partitioned by an insulating spacer as is generally done so that connection and disconnection can be performed without affecting the gas circuit breaker 20 side and the disconnector unit side. In the embodiment, the connection portion 32 is provided on the side surface of the gas circuit breaker 32 so that the connection with the disconnecting unit can be performed more easily, and the position of the connection portion 32 is, for example, the operating device of the cutoff portion 20A. By changing the mounting location of 20B to the side surface or the lower side, it is also possible to make it the longitudinal end of the gas circuit breaker 20, and the gas circuit breaker 20 is located on the left side in the figure. , It can be configured without any problem even if it is inverted and placed on the right side.

The disconnector part that constitutes the other part of the GCS is an insulating spacer in which the bus-side disconnectors 21 and 22 partition the gas as shown in FIG.
Branch busbar with busbar conductor 27A arranged inside via 27B and 27C
It is connected and integrated at 27, and is installed on the installation base 29 by the stand 35.36. The disconnectors 21 and 22 on each bus side are
In this example, insulating spacers 21B and 22B are interposed between the bushings 25 and 26, and the disconnecting portions 21A and 22A move vertically so that the overall longitudinal dimension is reduced. Although it is possible, the disconnector as described in the example of FIG. 3 can also be used. When the movable part of the disconnecting part 21A of the disconnecting device 21 on the busbar side is in the vertical direction as shown in FIG. 4, the connecting part between the disconnecting unit and the gas circuit breaker 20 is not limited to the opposing surfaces of both, but its longitudinal end. It is also possible to provide the conductor 31 for electrical connection.

GCS, which is an embodiment of the present invention, has a gas circuit breaker 20 and one disconnector 23 part, and a disconnector unit part having two busbar-side disconnectors 21 and 22 arranged in parallel, and viewed from the side. With the bushing 24, which is the transmission line side, as the center, the bushing 25 connected to the instep bus 1 and the bushing 26 connected to the Otsu bus 2 are located on the left and right, so the overall length is significantly Therefore, it is possible to update each substation equipment in an air insulation type substation without any trouble and in a short time.

〔The invention's effect〕

If the GCS is configured as in the present invention, it can be manufactured to have an optimal structure for the construction of a steel tower in an air-insulated substation. Therefore, by effectively utilizing the existing installation foundation of the air-insulated substation equipment, it is possible to easily update the substation from the air-insulated system to GCS in a short period of time.

[Brief description of drawings]

1 is a front view showing a gas-insulated composite switchgear according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG.
Fig. 3 is a vertical sectional view taken along line III-III, Fig. 4 is a vertical sectional view taken along line IV-IV in Fig. 2, and Fig. 5 is a front view of a conventional air-insulated substation.
FIG. 6 is a front view of a conventional gas-insulated composite switchgear. 1 …… Ko Bus, 2 …… Otsu Bus, 15 …… Auxiliary equipment, 20 ……
Gas circuit breaker, 20A ... Breaker, 21, 22, 23 ... Disconnector, 24,
25,26 …… Bushing, 27 …… Branch busbar, 32 …… Connection part.

Claims (3)

[Claims] 1. A double busbar in which two air-insulated busbars are connected to one of the circuit breakers via a disconnector and a bushing, respectively, and a power transmission line or the like is connected to the other via a disconnector and a bushing. A gas-insulated composite switchgear used in a substation of the method, wherein the circuit breaker is a gas circuit breaker containing a circuit breaker in a tank, and the busbar-side disconnectors are both ends of a gas-insulated branch busbar. Are connected to each other and integrally configured as a disconnector unit, and the disconnector unit is arranged so as to be juxtaposed with the gas circuit breaker at a predetermined interval, and the disconnector on the power transmission line side is the A gas breaker is attached to one end in the longitudinal direction of the gas circuit breaker and is connected in series to form a disconnector that establishes the bushing. One disconnector side of the disconnector unit and the other longitudinal end of the gas circuit breaker. With the department And a bushing established in the disconnector on the side of the power transmission line is located in a portion corresponding to the bushing of the disconnector unit. 2. The gas-insulated composite according to claim 1, wherein a connecting portion to a disconnecting switch unit arranged in parallel is provided on a side surface of the other end portion in the longitudinal direction of the gas circuit breaker. Switchgear. 3. A gas-insulated composite switchgear according to claim 1, wherein an auxiliary device on the side of the power transmission line is installed in a disconnector part connected to one end of the gas circuit breaker in the longitudinal direction. apparatus.