JPS5967803A - Gas insulated switching device - 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 [Technical Field of the Invention] The present invention relates to a double-bus type gas insulated switchgear, and more particularly to an improved gas insulated switchgear designed to reduce the size of the device.

[Background technology and its problems]

For the purpose of stably supplying power, a circuit configuration as shown in FIG. 1, that is, a double bus system is increasingly being adopted. In Figure 1, 1 and 2 are respectively bushings BG.
Intermediate and O busbars are connected to the power transmission line via I and BO2, respectively, and a breaker 5 is connected from each busbar 1 and 2 via respective disconnectors 3 and 4. A gas insulated switchgear that embodies the single line diagram in FIG. 1 is shown in FIGS. 2 and 3.

Here, in Figures 2 and 3, the case is shown in which gas-insulated equipment is installed as additional equipment in a substation where each component is air-insulated as existing substation equipment. It is listed. That is, in such a case, it may be necessary to place a switch 7 or a disconnector on one side of the bus bar, and install a bushing on the other side to connect to the existing overhead line. The figure was created in response to this, and branch busbars 8a, 8
Disconnectors 3 and 4 are arranged via b. A and B busbars 1.2 are horizontally arranged below the disconnectors 3 and 4 in a direction orthogonal to the axial direction of the circuit breaker 5. BG is a shishing for connecting to the power transmission line, and this shishing BC is established on the support tank 6, but the support tank 6 and the bus bar 1.
2 are connected via branch busbars 7, respectively. Here, the branch busbar 7 requires a predetermined length L in order to ensure the air insulation ratio r (tt) between the bushing BG and the disconnector 3. Therefore, the installation area of the entire device is required to be large. In addition, when connecting the bushing BG2 and the disconnector 4b in the illustrated embodiment, the branch busbar 7 must be pulled out avoiding the busbar 1, which makes the branch busbar 7 unnecessarily long. I had to.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object of the present invention is to obtain a gas insulated switchgear that can reduce the installation area.

[Summary of the invention]

In order to achieve this object, according to the present invention, in a double busbar system, a disconnector is installed below the busbar, and a shishing is installed above the busbar, so that the disconnector and the bushing are connected in a straight line through the busbar. They are arranged in a shape.

[Configuration of Example]

An embodiment of the present invention will be described with reference to FIGS. 4 to 6. The horizontal grounded tank type gas breaker 5 is arranged inside the tank together with the SF6 gas so that the breaker part is separated in the axial direction of the tank. At the end of this gas breaker 5,
One end of the branch busbar 8a extending in a straight line in the tank axial direction is connected. This branch bus bar 8a is constructed by inserting a conductor along with SF and gas into the pipe. The other end of the branch busbar 8a is connected to a disconnector 3 which houses a disconnector i% in a tank that approaches and separates in a direction perpendicular to the tank axis direction. A bus line I is arranged above the disconnector 3 so as to be parallel to the plane formed by the tank axis direction and perpendicular to the tank axis direction. A disconnector 4 having the same configuration as the disconnector 3 is arranged in parallel to the tank axial extension of the disconnector 3, and the both-end switches 3.4 are connected by a branch bus 8b. A second bus bar 2 is arranged on the disconnector 4 in parallel with the first bus bar 1.

However, in the above configuration, each bus 1 and 2 has multiple lines A.
, B are connected, and a bushing BG is established on the A and B bus lines 1.2 to be connected to an overhead line (not shown). Here, A fJ and line 1 are connected via a bushing terminal BGI established on A bus line 1 located above disconnector 3a in line A, as shown in FIG. Therefore, the disconnector 3a is arranged below the horizontally arranged bus line I, and the bushing BGJ is arranged above it in a straight line. On the other hand, the bus line 2 is connected to the overhead line via a bushing BGI established on the bus line 2 located above the disconnector 4b in the other line B, as shown in FIG.

A and B mentioned above (at iL' line 1.2, disconnector 3°4
In addition, the part to which the bushing BG is attached has a first opening for attaching a disconnector at one end of the busbar tank;
It is only necessary to provide a 4.2 opening for bushing attachment on the opposite side of the opening.

With this busbar tank configuration, it is possible to use disconnectors with the same shape for both the first and second busbars.

〔Effect of the invention〕

As explained above, according to the present invention, mutually parallel insteps are disposed horizontally on the installation surface on the - side in the extension direction of the breaker so as to be perpendicular to the breaker.

In a gas-insulated switchgear of a two-time bus system, in which a busbar is arranged and the busbars A and B are connected to the circuit breaker through a disconnect switch, the busbars A and B are bushed to the overhead line, respectively. When connecting via the bus bar, the disconnector is placed at the bottom of the bus bar, and a bushing is established at the top of the bus bar, so the total installation area of the device can be reduced, and the number of branch bus bars can be reduced. We can provide gas insulated switchgear.

[Brief explanation of drawings]

WJ2 Figure I [a-ITIa line arrow view, Figure 3 (h) is Figure 2 tubTrub line arrow view, Figure 4 is a plan view of one embodiment of the present invention, Figure 5 is Figure 4 v 6 is a view taken along the line ■-■ in FIG. 4. l... A bus line, 2... O bus line, 3, 4... Disconnector, 5... Breaker, BGI, BG2... Bushing. Applicant's agent Patent attorney Takehiko Suzue 1 Figure 2 Figure 3 (b) Figure 4 Each figure 5 Figure a Box 6WII

Claims (1)

[Claims] Arrange A and B bus lines that are parallel to each other and are arranged horizontally on the installation part and perpendicular to the breaker tank on the - side in the direction of extension of the breaker tank, and connect these A and B bus lines to the breaker. In a double-bus type gas insulated switchgear in which each of the busbars is connected via a disconnector, when connecting the busbars A and B to the overhead line through bushings, the disconnector is installed at the bottom of the busbar. A gas insulated switchgear characterized by having a bushing installed above the bus bar.