JPS5826246B2 - gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement of a gas-insulated switchgear in which a bushing disposed on the upper part of the transformer unit, such as a disconnector unit and a grounding device, is electrically connected to the disconnector unit attached to the breaker unit. Regarding.

Generally, a breaker unit for a gas-insulated switchgear has a contact point housed together with an insulating gas in a sealed container, a bushing mounting part on the outer periphery of the sealed container, and a converter mounting part formed at the end of the sealed container. Some transformer equipment mounting portions are combined with other transformer equipment units such as disconnector units, busbar units, and grounding devices.

In such a configuration, conventionally, the substation equipment unit is supported by support legs formed on the side of the tank, a flange is formed on the top of the substation equipment unit, and the substation equipment unit and the electric The bushing that connects to the

Therefore, since the weight of the bushing is directly used for the tank and support legs of the substation equipment unit, there is a drawback that the tank and support legs of the substation equipment unit must have sufficient mechanical strength to withstand the weight of the bushing.

In addition, when performing maintenance and inspection of the substation equipment unit to which the bushing is attached, the bushing must be removed from the substation equipment unit, which is inefficient and economically undesirable.

In addition, when bushings are attached to the breaker unit and the disconnector unit connected in series with this breaker unit, insulation problems occur because the heights of the left and right bushings are different, which causes disconnection. Since the tank height of the disconnector unit must be made equal to the height of the breaker tank, the disconnector unit case must be made unnecessarily large.

This invention was made in view of the above circumstances, and it is not necessary to increase the mechanical strength of the tank of the disconnector unit, without increasing the size of the tank, the inspection work of the disconnector unit is easy, and it is economical. It is an object of the present invention to provide a gas insulated switchgear which is advantageous for

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 ayb is a front view and a side view showing the entire device of this invention.

A breaker unit GOB is supported almost horizontally from an approximately center position to one end side of the mount SD, and an aerial bushing BG1 is mounted at right angles to one end side of this breaker unit GOB.
is installed.

A current transformer OT1 is inserted through the root of the bushing BG1.

The other end side of the gantry SD (that is, the breaker unit) GO
Pneumatic bushing BG2 is installed on the frame SD on the other end side of B.
A current transformer CT2 is inserted through the base of the bushing BG2, and a transformer unit (for example, a disconnector unit) DS is supported at the bottom of the bushing flange BG2.

The above-mentioned disconnector unit) DS has an operating mechanism M for operating it.
D8 and a grounding device ES are respectively installed, and an insulating gas such as SF8 gas is sealed in the disconnector unit DS.

On the other hand, a substation equipment unit mounting portion ST is formed at the other end of the breaker unit GCB, and this unit mounting portion 8T
The disconnector unit DS is attached to the disconnector unit DS.

Further, inside the airtight container of the breaker unit GOH, two sets of contacts are filled with an insulating gas, for example, SF6 gas,
An operating mechanism MOB for opening and closing the contact is attached to the lower surface of the sealed container, and two bushing mounting portions BGIT, BG2T and a manhole are formed on the upper surface of the sealed container, and the bushing mounting portion BG
Bushing BG1 is attached to IT.

An end portion of the center conductor supported by an insulating spacer (not shown) is located inside near the bushing attachment portion BG2T in order to be connected to the bushing BG2.

Furthermore, blind covers ORI and OR2 are removably installed on the manhole and bushing attachment portion BG2T by means of fastening members (positions indicated by dashed lines in the figure).

FIG. 2 shows an electrical connection diagram of a gas insulated switchgear having such a configuration.

FIG. 3 is a partial sectional view showing a state in which the disconnector unit DS and the bushing BG2 are attached to the stand SD in FIG. 1.

That is, the pedestal SD has a truss-like frame at the bottom and the circumference, for example, by members having a cross-sectional shape, and has a circular hole bored in the upper part.

The pedestal SD is fixed to the floor surface, and a flange BF2F formed on the lower surface of the bushing BG2 is placed on the upper edge of the pedestal SD with the circular hole.
The upper edges of F and frame SD are removably fastened to each other by means of BT.

Also, on the bottom surface of 7 lunge BG2F of bushing BG2,
Disconnector unit) Apply the insulating spacer SR fixed to the 7-lunge DSF on the bushing side of the DS, and connect it with the one-dot chain line B1 shown in the figure.
Install a bolt at the position and tighten with a nut.

In this case, the horizontal part of the case of the disconnector unit B8 passes through the inside of the pedestal DS.

In the figure, TB and TGOB are terminals for electrically connecting to the bushing G2 and the breaker unit (GOH), respectively, and B2 indicates the bolt position used to connect the breaker GOB and the disconnector unit DS, 0ONI, 0O.
N2 indicates a conductor.

As described above, according to the present invention, the bushing BG2 is supported by a fastening member such as a bolt on the stand SD fixed on the ground, and the flange BG2 at the lower part of the bushing BG2
Since the disconnector unit (disconnector unit) DS is supported by a fastening member such as a bolt on F, the weight of bushing BG2 is
Since the tank of the disconnector unit DS does not require much mechanical strength because it is added to the disconnector unit DS)
In order to carry out the maintenance inspection of S, it is only necessary to disconnect the disconnector unit DS and the bushing BG2 without removing the bushing BG2, so the inspection work is easy and economically advantageous.

That is, the disconnector unit DS can be removed by removing the bolt at the connection between the bushing BG2 and the breaker GOB, so that inspection of the disconnector unit DS can be easily performed.

Furthermore, since bushing BG2 is attached to the stand (disconnector unit DS side) SD, the breaker unit) GO
B and disconnector unit) Even if the height of the bushing installed on the DS is different, just by changing the height of the stand, there is no need to increase the height of the tank of the disconnector unit DS. There is no need to increase the size of the tank.

Note that the present invention is not limited to the embodiments described above, and can be implemented with the following modifications, for example.

That is, in the above-mentioned embodiment, the disconnector unit DS was removably attached to the lower end of the bushing BG2, but the disconnector unit DS was not attached to the lower end of the bushing BG2, but was removably attached to the lower surface of the stand SD. May be installed.

Furthermore, in the above-mentioned embodiment, the disconnector unit DS was arranged linearly with respect to the breaker unit GOB, but the disconnector unit was arranged perpendicularly to the pipe axis of the breaker unit GOB. You may.

In addition, various modifications can be made without changing the gist of the invention.

[Brief Description of the Drawings] Figures 1a and 1b are front and side views showing an embodiment of the gas insulated switchgear of the present invention, Figure 2 is a wiring diagram of the same embodiment, and Figure 3 is the first embodiment of the gas insulated switchgear of the present invention. FIG. 3 is a partial cross-sectional view showing how the bushing is attached to the frame shown in FIG. GOB...breaker unit, ST...substation equipment unit mounting part, BGl, BO2...bushing, D
S...disconnector unit, SD...mount, BT...
Bolt, SR...Insulation spacer, Bl, B2...Bolt mounting position.

Claims (1)

[Claims] 1. In a gas-insulated switchgear in which a breaker unit is connected in series with a breaker unit and a bushing is disposed above the breaker unit, the bushing is erected and supported on a pedestal fixed to a fixed part, and the breaker unit is connected in series with the breaker unit. A gas insulated switchgear in which the weight of the unit is supported by the pedestal.