JP2878762B2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a gas insulated switchgear having an improved gas monitoring section.

(Prior art) A high-voltage charging section is indicated in an insulated state using an insulating spacer inside a sealed grounded metal container, and an insulating gas such as SF6 gas is sealed in the metal container. Switchgears are widely used in substations, switchgears, and the like for reasons such as miniaturization of equipment and improvement in reliability.

FIG. 3 shows a general single-line connection diagram of a gas insulated switchgear having a double bus bypass circuit including a bus, an auxiliary bus, a bypass disconnector, and the like as one of such gas insulated switchgears. That is, in FIG. 3, A is the first transmission line circuit,
B indicates a second transmission line circuit, and a transmission system has a plurality of such transmission line circuits. These lines A,
B is connected to the main bus 1 and the auxiliary bus 2 respectively, and a bus connecting line 3 is provided for electrically connecting and disconnecting the main bus 1 and the auxiliary bus 2. Further, the transmission line circuit A includes a line disconnector 4, a circuit breaker 5, a bypass disconnector 6, a main bus disconnector 7, and an auxiliary bus disconnector 8.

FIG. 4 shows a conventional gas monitoring section in such a gas insulated switchgear with a double bus bypass circuit. That is, the fourth
In the figure, the line disconnector 4 and the bypass disconnector 6 are in the line side device gas monitoring section 11, the auxiliary bus disconnector 8 is in the auxiliary bus disconnector gas monitoring section 12, and the main bus disconnector 7 is the main bus. It is classified into the disconnector gas monitoring category 13. Also,
Generally, the circuit breaker 5 has a different rated gas pressure from other disconnectors and the like, and is therefore individually classified into a circuit breaker gas monitoring section 14.

(Problems to be Solved by the Invention) By the way, in such a conventional gas monitoring section, the number of gas monitoring sections per line requires four sections 11 to 14 per line, and accordingly, a pressure gauge is provided for each gas monitoring section. , A pressure switch, a failure indicator, and the like are required, and the number of these components increases, resulting in a drawback that the device becomes complicated. Also, the number of connection points increases, which is not preferable in terms of reliability.

However, if the gas section is simply extinguished in consideration of such a point, a gas section straddling the main bus 1 and the auxiliary bus 2 is formed, and maintenance of each device included in the gas section is performed. At the time of inspection, both the main bus 1 and the auxiliary bus 2 need to be stopped. However, there is a disadvantage that the demand for power demand such that the operation stop range is within one line and one side bus cannot be satisfied.

The present invention solves the above-mentioned problems of the prior art, and ensures that the bus and circuit operation and power transmission stop ranges during maintenance and inspection are the same as before, and that the number of gas monitoring sections is eliminated, which is necessary. It is an object of the present invention to provide a gas insulated switchgear capable of eliminating equipment to be replaced and improving reliability.

[Structure of the Invention] (Means for Solving the Problems) A gas insulated switchgear according to the present invention includes a line disconnector,
1st batch of disconnector for bypass and disconnector for auxiliary bus
The configuration is characterized in that only the main bus disconnector is used as the second gas monitoring section.

(Operation) In the present invention having the above-described configuration, the line disconnector bypass disconnector and the auxiliary bus disconnector connected to the auxiliary bus are collectively assigned to the first gas monitoring section and to the main bus. Since only the connected main bus disconnector is used as the second gas monitoring section, the number of gas monitoring sections conventionally provided for each device is reduced, and any of the first and second gas monitoring sections is used. Does not straddle the main bus and the auxiliary bus,
The operation stop range at the time of maintenance and inspection can be either one of the main bus or the auxiliary bus as in the related art.

In addition, since the gas monitoring sections are integrated, the overall volume of the container of the gas insulated switchgear constituting the gas monitoring sections is increased, so that even in the event of a leak accident, the rate of gas pressure reduction is reduced.

(Example) Hereinafter, the present invention will be described with reference to an example shown in FIGS. 1 and 2. FIG. In FIG. 1, the same symbols as those in FIG. 4 indicate the same parts.

In the gas insulated switchgear of the present embodiment, as shown in the single-line diagram of FIG. 1, the line disconnecting switch 4, the bypass disconnecting switch 6, and the auxiliary bus disconnecting switch 8 are collectively provided with the first gas. It is classified into monitoring category 15. The other gas monitoring sections include a main bus disconnector gas monitoring section 13 (corresponding to a second gas section of the present invention) and a circuit breaker gas monitoring section 14 as in the prior art.
It is divided into.

This point will be described with reference to the arrangement of the actual equipment shown in FIG. 2. The container of the main bus 1 is provided with a T-shaped container 20 of the disconnector 7 for the main bus via a gas-tight insulating spacer 1a. Connected. Further, the container 21 of the bypass disconnector 6 is connected to the container of the auxiliary bus 2 via an insulating spacer 2a which is also gas-tight. Bypass disconnector 6
The container 22 of the auxiliary bus disconnector 8 is connected to the lower side outlet of the container through an insulating spacer 6a that allows gas to flow freely.
The container 22 is connected to one side opening of the T-shaped container 20 of the main bus disconnector 7 via an air-tight insulating spacer 8a. On the other hand, the horizontal outlet of the main bus disconnector 7 opposite to the T-shaped container 20 is the container of the vertical circuit breaker 5.
The lower outlet of the circuit breaker 5 is connected via an airtight insulating spacer 7a, and the upper outlet of the container 23 of the circuit breaker 5 is connected to the container 24 of the line disconnector 4 via the airtight insulating spacer 5a. Is connected. One end of a T-shaped container 25 for line connection is connected to an end of the container 24 of the line disconnector 4 opposite to the circuit breaker 7 via an insulating spacer 4a through which gas can flow freely. The upper end of the container 21 of the bypass disconnector 6 is connected to the opposite end of the T-shaped container 25 via an insulating spacer 6b through which gas can flow freely.

In this embodiment having such a configuration, the line disconnector 4, the bypass disconnector 6, and the auxiliary bus disconnector 8
The insulating spacers 6a, 6b, 4a between them are free of gas flow, so that the first gas monitoring section is collectively used and only the main bus disconnector 20 is used as the second gas monitoring section. Therefore, as compared with the conventional gas insulated switchgear in which the gas monitoring section is configured for each individual device, the configuration of each device and the monitoring device attached thereto is simplified. In addition, since the first and second gas monitoring sections are independent gas sections on the main bus 1 and the auxiliary bus 2 side, during maintenance and inspection of the equipment of one of the gas monitoring sections, the bus on that side is used. It is only necessary to stop the operation of.

In particular, when performing a maintenance inspection such as an internal inspection of a disconnector or a replacement of parts, it is necessary to remove the internal insulating gas and open a hand hole or the like to perform the above-mentioned work. Is accompanied by a temporary suspension of operation. Table 1 shows a comparison of the stop range between the present embodiment and the conventional technique.

As shown in Table 1, the operation stop range of the bus and the line in the present embodiment is completely the same as that of the prior art, and according to the present embodiment, the operation stop range of the bus and the line is one even during maintenance and inspection. It is possible to satisfy demands of consumers, such as within the line and one-side bus.

[Effects of the Invention] As described above, according to the present invention, it is possible to eliminate the number of gas monitoring sections without impairing maintenance and inspection performance, and to provide a highly reliable gas insulated switchgear. Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a single-line diagram showing a gas monitoring section according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing an arrangement of each device in the embodiment of FIG. The figure is a single-line diagram of a general gas-insulated switchgear with a double-bus bypass circuit, and FIG. 4 is a single-line diagram showing gas monitoring sections of a conventional gas-insulated switchgear. 1 ... main bus, 2 ... auxiliary bus, 3 ... bus connection line,
4 ... track disconnector, 5 ... breaker, 6 ... bypass disconnector, 7 ... main bus disconnector, 8 ... auxiliary bus disconnector, 11-15 ... gas monitoring classification, 20 ~ 25 ... Metal container.

Claims (1)

(57) [Claims] 1. A main bus, an auxiliary bus provided therewith, a line for a line drawn from the main bus, a disconnector and a circuit breaker for the main bus sequentially provided on the line for the line from the main bus side. And a line disconnector, an auxiliary bus-side line connected to the main bus side of the disconnector of the line from the auxiliary bus, and an auxiliary bus disconnector provided on the auxiliary bus-side line. A gas insulated switchgear comprising a bypass line drawn from an auxiliary bus to a line for a line and a bypass disconnector provided on the bypass line, wherein the line disconnector, the bypass disconnector and the auxiliary A gas insulated switchgear, wherein the bus disconnectors are collectively used as a first gas monitoring section, and only the main bus disconnectors are used as a second gas monitoring section.