JPH078087B2 - Gas insulated composite switchgear for switchyards - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a gas-insulated composite switchgear for switchyards, and more particularly to a double-bus type gas-insulated composite switchgear for switchgear.

[Background of the Invention]

Recently, gas-insulated composite switchgear has been generally adopted in order to reduce the size of switchgear by efficiently utilizing the site. As shown in Fig. 2, this type of device separates the gas circuit breakers 1A and 1B corresponding to the transmission-side bushings 5A and 5B, respectively, via the disconnector from the site of the service tower 10 part of the switchyard. I am trying to install each phase. And, between each of these gas circuit breakers 1A, 1B, connecting busbars 2 of two gas insulating structures arranged in parallel are connected at both ends by interposing gas insulated disconnecting switches 3A, 3B, a grounding switch, etc., The receiving side bushings 4A and 4B are established at symmetrical positions of the connecting busbars 2 near the gas circuit breakers 1A and 1B, respectively, so as to form a gas-insulated structure. Receiving side bushings for each phase of this equipment 4
Into A and 4B, the lead-in tower 10 is introduced. One transmission line 6A is connected via a drop line 7A, and the other transmission line 6B is connected.
Are connected via the service line 7B. As such a device-related device, there is, for example, JP-A-56-22505.

However, in the configuration of the switchyard by the above-mentioned device, one power transmission line 6A, the power receiving side bushing 4A, and the other power transmission line 6B.
The service lines 7A and 7B used to connect the power receiving side bushing 4B with the power receiving side bushing 4B need to secure a sufficient insulation distance between the respective phases.
The retracted positions of A and 6B must be located further outside. Therefore, the distance between the power receiving side bushings 4A, 4B and the power transmitting side bushings 5A, 5B and the distance between the power receiving side bushings 4A and 4B are increased,
Since the connecting bus bar 2 must be made large, and the entire apparatus becomes large, the installation area of the entire switchyard is significantly increased and it is not economically producible.

[Object of the Invention]

An object of the gas-insulated composite switchgear for switchgear of the present invention is to secure an insulation distance between a service wire and a bushing on the power transmission side, to reduce the size of the entire device, and to greatly reduce the installation area.

[Outline of Invention]

In the gas-insulated switchgear for switchgear according to the present invention, a service tower having end steel towers at both ends and an intermediate tower is used, and each end steel tower is provided above the service tower corresponding to the gas-insulated composite switchgear of at least one phase. And, on both sides of the intermediate tower, the anchors that fix one end respectively are provided facing each other, and the lead wire is locked between these opposing insulators, and this lead wire is connected to the transmission line by the connecting wire and the drop wire is connected. It is characterized in that it is connected to each of the power receiving-side bushings of the corresponding phase.

Example of Invention

Hereinafter, a gas-insulated composite switchgear for switchgear according to the present invention will be described with reference to FIG. 1, which is an embodiment thereof.

In this example, the end towers at both ends to achieve the retracted tower 10
The retracted steel tower 10 having 11A and the intermediate steel tower 11B is effectively utilized. That is, the end side steel tower 11A on the receiving side and the intermediate steel tower 1
Retaining insulators 12A and 12B having one ends fixed at opposing positions above 1B are provided so as to correspond to arbitrary phases. And, a lead wire 13A is placed between these anchors 13A,
In addition, a lead wire 13B is installed between the anchors 12B. Then, the power receiving side bushings 4A, 4B of the gas-insulated composite switchgear for each phase that are juxtaposed are set up on the respective connecting busbars 2 so as to be located below the respective anchors 12A, 12B protruding on both sides of the intermediate tower 11B. Then, it has a normal double busbar structure.

In the example of FIG. 1, the transmission lines 6A and 6B of the phase that reach the position closest to the intermediate tower 11B of the drop tower 10 are the drop lines 7A and 6A, respectively.
The transmission lines 6A and 6B for the other two phases which are connected to the receiving side bushings 4A and 4B via 7B are temporarily connected to the connection line 1
After connecting to the corresponding phase lead wires 13A, 13B by 4,
By connecting to the receiving side bushings 4A and 4B via the service lines 7A and 7B at positions close to the intermediate tower 11B, each phase is connected to each bushing at almost the same position without special consideration for insulation. be able to. The power transmission side bushings 5A and 5B of each phase are the support insulators 1 arranged in the service tower 10.
5A, 15B and the transmission lines 16A, 16B supported by the mooring insulators 17A, 17B provided on the end steel tower 11A are used by being connected.

In such an embodiment of the present invention, each power-receiving-side bushing 4
A and 4B are connecting busbars 2 that can secure both insulation distances.
Since it can be established at the axial position of, the size of the connecting bus bar 2 for gas insulation can be shortened. Also, the receiving side bushings 4A, 4B
Also, the dimension between the transmission side bushings 5A, 5B of the gas circuit breakers 1A, 1B is not affected by the service lines 7A, 7B, and can be reduced to a length that can secure the insulation distance between them. Therefore, the axial dimension of the gas insulated switchgear can be significantly shortened. Therefore, the installation area of the double-bus type gas-insulated switchgear in the switchyard can be reduced by about half compared to the conventional one.

In the above-described embodiment, the example in which the two-phase detention insulators 12A, 12B and the lead wires 13A, 13B are provided has been described, but all three phases have the same structure or are drawn farthest from the intermediate tower 11B. It can be arbitrarily changed, such as applied to only the phase.

〔The invention's effect〕

If the gas-insulated composite switchgear for switchgear is configured as in the present invention, a drop-in steel tower having end towers and intermediate iron towers at both ends is used, and at least an upper portion of the drop-in tower corresponding to the gas-insulated composite switchgear of one phase, On both sides of the end portion and the intermediate steel tower, there are provided porcelain insulators, one end of each of which is fixed, facing each other to lock the lead wire, and the lead wire is connected to the power transmission line,
Since each receiving side bushing is connected via the service wire, it is possible to secure a sufficient insulation distance between the service wire and each part of the device, so the overall length of the device can be shortened and miniaturized. There is an effect that it can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a gas-insulated composite switchgear for a switchyard according to the present invention, and FIG. 2 is a front view showing a conventional gas-insulated composite switchgear for a switchyard. 1A, 1B ... Gas circuit breaker, 2 ... Connection busbar, 3A, 3B ... Disconnector, 4
A, 4B ... Reception side bushing, 5A, 5B ... Transmission side bushing, 6
A, 6B ... Transmission line, 7A, 7B ... Service line, 10 ... Service tower, 11A ... End tower, 11B ... Intermediate tower, 12A, 12B ... Retaining insulator, 13A, 13B
… Lead wire, 14… Connection wire.

Claims (1)

[Claims] 1. A gas circuit breaker provided with a power transmission bushing that is vertically installed in a correspondingly spaced manner on a site of a service tower having an end tower and an intermediate tower at both ends,
A power transmission line that includes two connection buses connecting the gas circuit breakers via a disconnector and a power-reception-side bushing that stands vertically on each of the connection buses, and that leads to both sides of the intermediate tower. Is a gas-insulated composite switchgear for switchgear that is connected to each of the power-receiving-side bushings via a service line,
Above the lead-in tower corresponding to at least one phase of the gas-insulated composite switchgear, there are provided lead-insulators, one end of each of which is fixed at both ends of the end tower and the intermediate tower, facing each other, and between the facing lead-insulators. The wire is locked, the lead wire is connected to the power transmission line by a connection wire, and the insulation distance between the lead-in wire and each part of the switchgear is increased by connecting the corresponding power-receiving-side bushing through the lead-in wire. A gas-insulated composite switchgear for switchyards, which has been secured.