JPS58224505A - 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 The present invention relates to a gas-insulated switchgear in which various types of switches are constructed in a sealed container filled with an insulating gas, and particularly to a gas-insulated switchgear having an air-insulated double busbar.

Gas insulated switchgear is a container filled with insulating gas.
This is a switch device such as a disconnector or circuit breaker, and by using an insulating gas, it can be made significantly smaller than an air-insulated switchgear. As the insulating gas, SF gas, which has excellent insulating properties, is generally used.

However, gas-insulated switchgears tend to be more expensive than conventional air-insulated switchgears. This is because a container filled with an insulating gas and an insulating support means to be supported within the container are required. For this reason, efforts have been made to reduce the number of containers in this type of opening/closing device.

We are also considering a switchgear that partially uses air insulation. For example, it is considered that the main bus bar is air-insulated, the switchgear is gas-insulated, and the two are connected by a bushing.

The present invention relates to this type of device, and an object of the present invention is to provide a gas insulated switchgear in which the installation area in the axial direction of the air-insulated main bus bar is reduced.

The present invention provides a gas-insulated switchgear in which the number of feeders on the power transmission line side is greater than the number of feeders on the transformer side, and which has a switchgear for connecting the main busbar (bustie unit). The transformer-side switchgear is configured on both sides of an integrated switchgear, and by configuring the busbar connection switchgear in a small size, a space is created in the axial direction, and this space is used to connect the busbar It is intended to be used as a space for inspection of the communication switchgear and both switchgears on the transformer side.

The present invention will be explained below with reference to embodiments shown in the drawings. First, the integrated structure of the power transmission line side and transformer side switchgear will be explained by representing one set.

Three bushings 1 and 2.3 are established on the same straight line. The end bushing 1 is connected to a power transmission line. The other bushings 2.3 are each connected to a double main busbar (not shown).

The double main busbars are arranged parallel to the phase direction of the gas insulated switchgear. When looking at gas insulated switchgear, its main configuration is on the straight line of bushing arrangement.

A breaker 4 on the power transmission line side is placed between the bushings 1 and 2, and a connection bus bar 5 is provided at the bushing 2.3m. The lower container of each bushing 1-3 constitutes a disconnector 6, 7.8, respectively. One end of the disconnector 6 is connected to a power transmission line, and the other end is connected to one end of the breaker 4. One end of the disconnector 7 is connected to the other end of the breaker 4 and one end of the connection bus bar 5, and the other end is connected to one main bus bar via the bushing 2. Further, one end of the disconnector 8 is connected to the other end of the connecting bus 5, and the other end is connected to the other main bus bar via the bushing 3. These constitute a feeder unit on the power transmission line side of the circuit. The remaining parts constitute a feeder unit on the transformer 9 side, and the circuit is the same as that on the power transmission line side.

The circuit is as shown in FIG. 2 in accordance with the layout shown in FIG.

Next, the feeder unit on the transformer 9 side will be explained. Disconnectors 10 and 11 are juxtaposed to the sides of the disconnectors 7 and 8, respectively. The two disconnectors 10.11 are connected by a connection busbar 12 that is substantially parallel to the connection busbar 5. The other ends of the two disconnectors 10.11 are respectively connected to the main busbars via bushings 2.3 by connecting busbars 13.14. The breaker 15 on the transformer side is
The bushings 1 to 3 are arranged on a straight line. One end of this breaker 15 is connected to the connection bus 12 by an L-shaped connection bus 16 . Further, the other end of the breaker 15 is connected to the transformer 9. Lightning arrester 17.18 is
It is connected to both ends of these integrated gas insulated switchgear.

In particular, the lightning arrester 18 is connected to the transformer 9 using a connection bus 19 whose level has been changed.

Three sets of switchgear having the above-mentioned configuration are arranged side by side with a predetermined air insulation distance between them. Three sets of switching devices 210 and 21v have the same structure as these.

Another set of 21W is configured. Between the two sets of switchgears having the same structure, there are integrated switchgears 22u and 22v for connecting the power transmission line side and the busbar, the details of which will be described later.

22W are arranged and configured. The present embodiment as a whole has four lines and two banks including one for bus line communication.

Next, one set of integrated switching devices for busbar connection and power transmission line will be explained.

In this switchgear, a bushing 1' for power transmission line connection and bushings 2/, 3/ for main bus connection are arranged at the same position as the bushings on both sides. Components that are the same as those of the above-mentioned switchgear are given the same reference numerals. What is particularly different is the disconnector 10'.

11', and a series connection body of the connection bus 12' and the circuit breaker 23 is arranged on a straight line parallel to the connection bus 5'. The details of the electrical connection are as shown in FIG. When configuring the power transmission line side and the busbar connection as one unit, the breaker 23 can be configured in various positions, but in this embodiment, since it is configured together with the connection busbar 12', the breaker 23 can be placed in the bushing 3'. An open space can be formed at the end on the transformer 9 side compared to the switchgear on both sides.

This open space can be used not only for maintenance and inspection of the circuit breaker 23 but also as a space for maintenance and inspection of the circuit breakers 15 on both adjacent transformer sides. Therefore, for other arrangements,
Since the space for maintenance and inspection cannot be consolidated, the installation area in the axial direction of the main bus bar or in the phase direction of each switchgear is increased, but according to this embodiment, the installation area in the same direction can be reduced. .

Transmission line side switchgear 24u, 24v+24 in Fig. 1
W is configured by itself. The basic configuration of this embodiment is three lines and two banks excluding this switchgear, and at least:
The present invention can be applied to a device having this basic configuration.

As explained above, the present invention provides two sets of switchgear that integrate the transmission line side and the transformer side, and between them, provides a switchgear that integrates the power transmission line side and busbar connection, and Each bushing connected to the air-insulated double main bus of the switchgear is connected to two substantially parallel bushings extending in the phase direction of each switchgear.
Because they are arranged in a straight line, the maintenance point plate angle and space for each switchgear's circuit breaker can be consolidated at one axial end of the central switchgear, resulting in gas insulation with a reduced phase direction overall. A switchgear is obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a gas insulated switchgear according to an embodiment of the present invention, and FIG. 2 is a circuit diagram modified to correspond to FIG. 1. 2.2', 3.3'... Bushing, 15.23.
...Continued from page 1 0 Inventor: Ken Takahashi, 5-1 Marunouchi-chome, Chiyoda-ku, Tokyo Inside Hitachi, Ltd. 0 Applicant: Hitachi, Ltd. 5-1 Marunouchi-chome, Chiyoda-ku, Tokyo

Claims (1)

[Claims] 1. In a gas-insulated switchgear consisting of two banks of at least three circuits, in which the switchgear is connected to the air-insulated double main busbar through a bushing, the transmission line side and the busbar connection are integrated. Switchgears that integrate the transmission line side and the transformer side are provided on both sides of the switchgear, and the bushings of the respective switchgears are arranged on two substantially parallel straight lines. Gas insulated switchgear.