KR900006640B1 - Gas insulating switchgear - Google Patents

Abstract

High pressure resistant gas-filled thin vessel circuit suitchgear has a valve or notched flanged partition spacer. The switchgear includes airtight container sealed insulating gas having main circuit, insulating gas in the container partitioned at the gas partition spacer having a press discharge device.

Description

Gas Insulated Switchgear

1 is a cross-sectional side view showing a gas insulated switchgear according to an embodiment of the present invention.

2 is a partial enlarged view of FIG.

3 is a cross-sectional plan view showing only a sealed container of a gas insulated switchgear according to an embodiment of the present invention.

4 and 6 are a circuit diagram and a gas classification explanatory diagram of a gas insulated switchgear to which the present invention is applied.

5 and 7 show a conventional gas insulated switchgear, and FIG. 5 is a cross-sectional side view.

7 is a cross-sectional plan view showing only a sealed container.

8 and 9 are cross-sectional side views of an insulating spacer section showing different embodiments of the present invention.

10 is a cross-sectional side view of a gas insulated switchgear according to the embodiments of FIGS. 8 and 9.

* Explanation of symbols for main parts of the drawings

1: main bus 2: bus bar disconnector

3: breaker 4: transformer

8: Gas division 10: Line side gas division

11: main bus side gas classification 21: pressure release device

The present invention relates to pressure release at the time of an accident in a gas insulated switchgear.

4 is a general circuit diagram of a gas insulated switchgear, in which: (1) is the main bus, (2) is the bus-side disconnector, (3) is the breaker, (4) is the transformer, and (5) (6) is a short circuit composed of the main bus (1), bus bar side disconnector (2), breaker (3), transformer (4), cable head (5), and the like.

The short circuit 6 is a unit constituting the gas insulated switchgear, and the entire circuit is configured by connecting the units.

This unit is shown in FIG. In the drawing, reference numeral 7 denotes an airtight container that houses and attaches the apparatuses 1 to 5, and 8 denotes a main bus line 1 and a main bus line disconnector 2 as shown in FIG. Gas division part 5 which separates gas into the main bus line side 10 which consists of apparatuses, etc., and the line side 11 which consists of apparatuses, such as a circuit breaker 3, a transformer 4, and a cable head 5. 8A and 8B are insulating spacers and flanges constituting this gas separator.

In the conventional gas insulated switchgear, as shown in Fig. 7, the plate thickness of the container 7 is thick, and inside the main bus line side 10 and the line side 11 in any gas part due to internal premature accidents. The airtight container structure withstands the increase in internal pressure.

Since the conventional gas opening and closing device is constituted as described above, since the strength of the container is sufficient to withstand the pressure rise during an accident within each gas section, the thickness of the container is increased or the reinforcement is required. In terms of cost, the cost is high, or there is a problem in terms of weight during transportation or installation.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a gas insulated switchgear that is economical and has good handling by reducing the thickness of the container as compared with the conventional one or by reducing the reinforcement.

In the gas insulated switchgear according to the present invention, a pressure relief device is provided in the gas separator.

In the gas insulated switchgear according to the present invention, when the gas pressure in the compartment is abnormally increased during the internal separation accident, the gas insulated switchgear is released to the adjacent compartment through the pressure relief device, Alleviates the pressure rise in the compartment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In Fig. 1, reference numeral 21 denotes a pressure relief device attached to the flange 8a, and Figure 2 shows an enlarged cross-sectional view of the pressure relief device 21, and in Fig. 22, 23, 23 and 24, pressure relief devices are shown. 22 is a bursting plate, 23 is a pressing plate for fixing the bursting plate 22 to the flange 8b, and 24 is attached to the pressing plate 23 to protect the bursting plate 22. It is a protective cover. (30) is the zero ring for the gas compartment

Reference numeral 25 denotes a sealed container composed of a thin plate as compared with the conventional sealed container 7 as shown in FIG.

In the gas insulated switchgear configured as described above, if an internal derailment accident occurs in the line side gas section 10, the gas pressure in the container 25 rises, and the bursting plate 22 is destroyed at a certain pressure. Pressure is released to the side gas compartment 11.

Therefore, the pressure increase in the line side gas section 10 is restrained by a low gas pressure, whereas the pressure increase in the main bus line side gas section 11 allows the internal pressure at the time of an accident in only one gas section as in the prior art.

Therefore, the strength of the container can be lowered by that much.

Further, in the above embodiment, the pressure is discharged from the line side gas segment 10 to the main bus side gas segment 11, but may be pressure discharge in the opposite direction.

In addition, although the gas division part 8 is comprised by the insulation spacer 8a and the flange 8b in the said Example, as shown in FIG. 10, a partition member is an insulation spacer only and a pressure-protection apparatus is attached to the insulation spacer. You may also

In the above embodiment, the rupture plate 22 is used as the pressure relief device 21. However, as shown in FIG. 8, the pressure relief valve or a part of the insulating spacer 8a as shown in FIG. Similarly, a notch may be put in the insulating spacer 8a.

As described above, according to the present invention, in the gas insulated switchgear, the pressure is prevented from the pressure device installed in the gas section at different gas divisions at the time of internal break accident, so as to suppress the pressure rise in the gas section of the accident part. Since the container strength can be lowered as compared with the prior art, the plate pressure of the container can be reduced or the reinforcement can be reduced, so that the device can be made cheaper and the weight is reduced, thereby improving the handleability. There is.

Claims (7)

A gas insulated switchgear having a gas divider in which a main circuit portion is stored in an airtight container encapsulated with an insulating gas, and the insulating gas is divided into two or more places in the container, wherein the gas segment is provided with a pressure release device. Gas insulation switchgear characterized in that. The gas insulated switchgear according to claim 1, wherein the gas separator comprises an insulating spacer and a flange. The gas insulated switchgear according to claim 1, wherein the gas separator comprises an insulating spacer. The gas insulated switchgear according to claim 1, wherein a bursting plate is used as the pressure discharge device. The gas insulated switchgear according to claim 1, wherein a pressure relief valve is used as the pressure relief device. 2. The gas insulated switchgear according to claim 1, wherein an insulating spacer, which is partially thinned, is used as the pressure discharge device. The gas insulated switchgear according to claim 1, wherein an insulating spacer having a notch is used as the pressure discharge device.

Images