JPH0570365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a gas insulated switchgear.

[Background of the invention]

FIG. 2 shows a conventional example of a gas insulated switchgear. As shown in the figure, one terminal of the disconnector 1 housed in a sealed container is connected to the first bushing 2a, and the other terminal is connected to the second bushing 2b via the disconnector 3. A vertical bushing lower container (hereinafter referred to as a lower container) 4 is provided at the bottom of the second bushing 2b, and a grounding switch 5a, 5b is provided. and lower container 4
As shown in FIG. 3, there is a current-carrying conductor 6 connecting the disconnector 3 and the center conductor 2c of the second bushing 2b, and a current-carrying conductor 6 disposed facing the current-carrying conductor 6 and provided externally. A voltage detection electrode 9 is provided, which is connected to a transformer 7 via a conductor 8.
This voltage detection electrode 9 is fixed with an insulating support 10. In addition, in FIG. 2, 11 is a lightning arrester.

In the gas insulated switchgear constructed as described above, the transformer 7 has conventionally been an amplification type capacitor type transformer 7 which is an amplification type transformer in which the voltage detected by the voltage detection electrode 9 is amplified by an amplifier. However, recently there has been an increasing demand from electric power companies to adopt a capacitor type transformer 7a, which will be described later, which detects the voltage without amplifying it. By the way, in order to satisfy this requirement, the capacitance of the voltage detection electrode 9 must be reduced to about the current level.
It is necessary to increase the voltage to approximately 170%, and to do so, the voltage detection electrode 9 must be made approximately 1.7 times longer than the current length. However, in order to lengthen the voltage detection electrode 9, the height of the device must be made taller, which would exceed the transport limit for ultra-high voltage insulation class devices such as those with a rated voltage of 500 kV, and this is not possible with the current design structure. It was possible.

[Purpose of the invention]

The present invention has been made in view of the above points,
It is an object of the present invention to provide a gas-insulated switchgear that makes it possible to increase the capacitance of a voltage detection electrode without causing any hindrance to transportation.

[Summary of the invention]

That is, the present invention connects one terminal of a disconnector housed in a sealed container to a first bushing, connects the other terminal to a second bushing via a disconnector, and connects the second bushing to the second bushing. A bushing lower container is provided in the lower part of the bushing, and inside this lower container there is a vertical current-carrying conductor connecting between the disconnector and the center conductor of the second bushing, and an external In the gas insulated switchgear, the voltage detection electrode is connected to a transformer provided in the bushing via a conductor, and the voltage detection electrode is supported by an insulating support. is formed of a plurality of removable divided containers and divided electrodes, and the voltage detection electrode is supported by the insulating support provided on at least one of the plurality of divided containers. Accordingly, the lower container and the voltage detection electrode are formed of a plurality of removable divided containers and divided electrodes, and the voltage detection electrode is formed by at least one of the plurality of divided containers. It comes to be supported by one divided container via an insulating support.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. An embodiment of the invention is shown in FIGS. 1 and 4. FIG. Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, there are two divided containers 4b and 4c, upper and lower, to which a lower container 4a and a voltage detection electrode 9a can be attached and detached, a divided electrode 9b,
9c, and voltage detection electrodes 9b, 9c.
was supported by an insulating support 10 provided on one of the two divided containers 4b and 4c. By doing so, the lower container 4a and the voltage detection electrode 9a are divided into two removable upper and lower divided containers 4.
b, 4c, and divided electrodes 9b, 9c, and the voltage detection electrode 9a is formed by two divided containers 4b, 4.
The gas insulation structure is supported by an insulating support 10 provided on one of the divided containers 4b in c, making it possible to increase the capacitance of the voltage detection electrode 9a without interfering with transportation. A switchgear can be obtained.

That is, the lower container 4a below the bushing 2b
is formed of two removable divided containers 4b and 4c, and inside these are arranged divided electrodes 9b and 9c, which are also removable and have a two-part structure, and these divided electrodes 9b and 9c are electrically connected. did. The divided electrodes 9b and 9c were supported in one divided container 4b via an insulating support 10. Further, the divided electrode 9b and the capacitor type transformer 7a are connected via a conductor 8. By doing so, the voltage detection electrode 9a is formed of two divided electrodes 9b and 9c,
Moreover, even if the divided electrodes 9b are fixed to the divided container 4b and the divided electrodes 9b are formed to a size that limits transportation during transportation, the structure of the gas insulated switchgear during transportation with the current-carrying conductor 6 removed is not shown. As shown in FIGS. 5 and 6, the divided container 4c and polarization voltage 9c (see FIG. 1) are removed, and the transport cover 12 is attached to the removed portion for transportation. Even if the length of the voltage detection electrode 9a is made longer than the transportation limit by the amount of time it is removed, transportation will not be impossible, and the voltage detection electrode 9a can be removed.
The capacitance of a can be increased without violating transportation restrictions, and on-site assembly work can be facilitated. Note that this embodiment uses the lower container 4a.
and voltage detection electrode 9a into two divided containers 4b,
4c and the case where the electrodes are formed by divided electrodes 9b and 9c have been described, but it goes without saying that the invention is not limited to this only, and the same implementation can be carried out even when the electrodes are divided into two or more.

Then, as shown in FIG. 4, an insulating support 10 for fixing the two divided electrodes 9b and 9c is
Since it is provided on the divided container 4b obliquely with respect to the axis of the divided containers 4b and 4c, it is possible to arrange the high voltage side electrode 10a and the container side electrode 10b of the insulating support 10 with an optimum insulation distance. Therefore, the voltage detection electrode 9a can be arranged without increasing the diameter of the lower container 4a. Note that the electrodes 10a,
10b is a metal fitting embedded in the insulating support 10 with a mold in order to fix the insulating support 10 to another object by tightening bolts; I used it because it was convenient.

〔Effect of the invention〕

As mentioned above, the present invention is a gas-insulated structure that does not hinder transportation even if the voltage detection electrode is lengthened, and makes it possible to increase the capacitance of the voltage detection electrode without hindering transportation. A switchgear can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view of the area surrounding the voltage detection electrode of an embodiment of the gas insulated switchgear of the present invention, Fig. 2 is a longitudinal side view showing the configuration of a conventional gas insulated switchgear, and Fig. 3 is a longitudinal side view of the area around the voltage detection electrode of an embodiment of the gas insulated switchgear of the present invention. FIG. 4 is a longitudinal side view of the area around the voltage detection electrode of the insulated switchgear; FIG.
FIG. 5 is an explanatory view showing the configuration of the gas insulated switchgear during transportation according to the same embodiment, and FIG. 6 is a right vertical side view of FIG. 5. 1...Shiya disconnector, 2a...First butsing,
2b...second bushing, 2c...center conductor,
3... Disconnector, 4a... Lower bushing container, 4
b, 4c... Divided container, 5a, 5b... Earthing switch, 6... Current-carrying conductor, 7a... Capacitor type transformer, 8... Conductor, 9a... Voltage detection electrode, 9b,
9c...Divided electrode, 10...Insulating support, 10a
...High voltage side electrode, 10b...Container side electrode.

Claims (1)

[Claims] 1. One terminal of a disconnector housed in a sealed container is connected to a first bushing, and the other terminal is connected to a second bushing via a disconnector,
A bushing lower container is provided in the lower part of the second bushing, and in this lower container there is a vertical current-carrying conductor connecting the disconnector and the center conductor of the second bushing, and a porous conductor and a vertical conductor connecting the disconnector and the center conductor of the second bushing. In the gas insulated switchgear, a voltage detection electrode is provided and connected to an externally provided transformer via a conductor, and the voltage detection electrode is supported by an insulating support. The voltage detection electrode is formed of a plurality of removable divided containers and divided electrodes, and the voltage detection electrode is formed of the insulating support provided in at least one of the plurality of divided containers. A gas insulated switchgear characterized in that it is supported. 2. The gas insulated switchgear according to claim 1, wherein the bushing lower container and the voltage detection electrode are formed of two upper and lower divided containers and divided electrodes. 3. The gas insulated switchgear according to claim 1, wherein the insulating support is disposed obliquely to the axis of the bushing lower container.