JPH03261312A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To reduce the number of gas monitoring section and necessary machine while ensuring power interruption range of bus or line at the time of maintenance or inspection by integrally setting line machines, bypass disconnector and an auxiliary bus disconnector in a first gas monitoring section whereas setting only a main bus disconnector in a second gas monitoring section. CONSTITUTION:A line disconnector 4, a bypass disconnector 6 and an auxiliary bus disconnector 8 are integrally set in a first gas monitoring section by employing insulating spacers 6a, 6b, 6c which can communicate gas freely, whereas only a main bus disconnector 7 is set in a second gas monitoring section. Consequently, construction of each machine and associated monitoring units can be simplified as compared with conventional system where each machine is set in individual gas monitoring section. Furthermore, since first and second gas monitoring sections are set independently at the sides of main bus 1 and auxiliary bus 2, power interruption is required at only one gas monitoring section at the time of maintenance or inspection of machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Field of Industrial Application) The present invention relates to a gas insulated switchgear with an improved gas monitoring section.

(Prior art) Gas insulation is a method in which a high-voltage charging part is supported in an insulated state inside a sealed grounded metal container using an insulating spacer, and an insulating gas such as SF6 gas is sealed in the metal container. Switchgears are widely used in substations, switchyards, etc. for reasons such as downsizing equipment and improving reliability.

As one such gas insulated switchgear, FIG. 3 shows a general single line diagram of a gas insulated switchgear with a double bus bypass circuit consisting of a busbar, an auxiliary busbar, a bypass disconnector, etc. That is, in FIG. 3, A is the first power transmission line circuit, and B is the first power transmission line circuit.
indicates a second power transmission line circuit, and a plurality of such power transmission line circuits exist in the power transmission system. These lines A,
B is connected to the main bus 1 and the auxiliary bus 2, respectively, and a bus connection line 3 is provided to electrically connect and disconnect between the main bus 1 and the auxiliary bus 2. Further, the power 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.

A conventional gas monitoring section in such a gas insulated switchgear with a double busbar bypass circuit is shown in FIG. That is, the fourth
In the figure, the line disconnector 4 and bypass disconnector 6 are placed in the line side equipment gas monitoring section 11, the auxiliary bus disconnector 8 is placed in the auxiliary bus disconnector gas monitor section 12, and the main bus disconnector 7 is placed in the main bus disconnector 7. It is divided into bus disconnector gas monitoring section 13. Further, since the rated gas pressure of the circuit breaker 5 is generally different from that of other circuit breakers, etc., the circuit breaker 5 is individually classified into a circuit breaker gas monitoring section 14.

(Problem to be Solved by the Invention) By the way, in such a conventional gas monitoring section, the number of gas monitoring sections of the - line is required to be 4 sections 11 to 14 in one line, and accordingly, a pressure gauge is required for each gas monitoring section. , a pressure switch, a fault indicator, and other devices are required, which increases the number of these parts and makes the device complicated. Furthermore, since the number of connection points increases, it is not desirable in terms of reliability.

However, if the number of gas divisions is simply reduced in consideration of these points, a gas division will be formed that straddles main bus 1 and auxiliary bus 2, and maintenance of each equipment included in that gas division will be required. It is necessary to stop both the main bus 1 and the auxiliary bus 2 during inspection, but there is also the drawback that it is impossible to meet the demand for power, such as limiting the range of operation to one line and one bus.

The present invention solves the problems of the prior art as described above, secures the same range of operation and power transmission stoppage of busbars and lines during maintenance and inspection as before, and reduces the number of gas monitoring sections so that the required The objective is to provide a gas-insulated switchgear that reduces the amount of equipment used and improves reliability.

[Structure of the Invention] (Means for Solving the Problems) The gas-insulated switchgear of the present invention collectively includes line equipment, bypass disconnectors, and auxiliary bus disconnectors as a first waste monitoring category, and The configuration is characterized in that only the busbar disconnector is included in the second gas monitoring section.

(Function) In the present invention having the above-described configuration, the line equipment, the bypass disconnector, and the auxiliary bus disconnector connected to the auxiliary bus are collectively placed in the first gas monitoring category, and the main bus is connected to the main bus. Since only the connected main bus disconnect switch is set as the second gas monitoring category, the number of gas monitoring categories that were conventionally provided for each device is reduced, and it is possible to reduce the number of gas monitoring categories provided for each device. Since the main busbar and the auxiliary busbar are not crossed over, the operation stop range during maintenance and inspection is limited to either the main busbar or the auxiliary busbar, as in the past.

Furthermore, by consolidating the gas monitoring sections, the overall volume of the container of the gas insulated switchgear constituting the gas monitoring section becomes larger, so even in the unlikely event of a leak accident, the rate of decrease in gas pressure will be slowed down.

(Example) The present invention will be described below with reference to the example shown in FIGS. 1 and 2. Note that in FIG. 1, the same reference numerals as in FIG. 4 indicate the same parts.

In the gas insulated switchgear of this embodiment, as shown in the single line diagram in FIG. It is classified into monitoring category 15.

Other gas monitoring sections are divided into a main bus disconnector gas monitoring section 13 (corresponding to the second gas section of the present invention) and a circuit breaker gas monitoring section 14, as in the prior art.

To explain this point using the actual equipment arrangement shown in FIG. 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. An auxiliary bus disconnector 8 is connected to the outlet of the bypass disconnector 6 at the lower side of the container via an insulating spacer 6a that allows free gas flow.
A container 22 is connected to the T-shaped container 2 of the main bus disconnector 7 via an airtight insulating spacer 8a.
It is connected to one side outlet of 0. On the other hand, the side outlet on the opposite side of the T-shaped container 20 of the main bus disconnector 7 is
It is connected to the lower outlet of the container 23 of the vertical circuit breaker 5 via an airtight insulating spacer 7a, and furthermore, an airtight insulating spacer 5a is connected to the upper outlet of the container 23 of this circuit breaker 5.
The container 24 of the line disconnector 4 is connected through the line.

One end of a T-shaped container 25 for line connection is connected to the end of the container 24 of this line disconnector 4 on the opposite side from the circuit breaker 7 via an insulating spacer 4a through which gas can flow freely. The upper outlet 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 freely flow.

In this embodiment having such a configuration, the line disconnector 4, the bypass disconnector 6, and the auxiliary bus disconnector 8 are
Insulating spacers 6a, 5b between them.

4a is made to have free gas flow, it is collectively designated as the first gas monitoring division, and only the main bus disconnect switch 20 is designated as the second gas monitoring division, so that gas monitoring is performed for each individual device. Compared to the conventional gas-insulated switchgear, which consists of separate sections, the configuration of each device and the monitoring equipment attached to it is simplified. In addition, the first and second gas monitoring sections are independent gas sections on the main bus 1 and auxiliary bus 2 sides, so when performing maintenance or inspection of equipment in one gas monitoring section, it is necessary to It is only necessary to stop the operation of the

In particular, when performing maintenance inspections such as internal inspection and parts replacement of disconnectors, it is necessary to remove the internal insulating gas and open a hand hole, etc., and perform the above work. accompanied by a temporary suspension of driving. Table 1 shows a comparison of this stopping range between this embodiment and the prior art.
Shown below.

Table 1 As shown in Table 1, the operation stop range of bus bars and lines in this embodiment is exactly the same as that of the conventional technology, and according to this embodiment, even during maintenance inspection, the operation stop range of bus bars and lines It is possible to satisfy the customer's request that the line be within one circuit and one busbar.

[Effects of the Invention] As described above, according to the present invention, it is possible to reduce the number of gas monitoring sections without impairing maintainability.
We can provide highly reliable gas insulated switchgear.

[Brief Description of the Drawings] Fig. 1 is a single line diagram showing the waste monitoring section in an embodiment of the present invention, Fig. 2 is a sectional view showing the arrangement of each device in the embodiment of Fig. The figure is a single line diagram of a typical gas insulated switchgear with a double bus bypass circuit, and FIG. 4 is a single line diagram showing a gas monitoring section of a conventional gas insulated switchgear. 1... Main busbar, 2... Auxiliary busbar, 3... Busbar connection line, 4... Line disconnector, 5... Circuit breaker, 6...
・Bypass disconnector, 7... Main bus disconnector, 8...
・Auxiliary bus disconnect switch, 11-15...Gas monitoring classification,
20-25...Metal container.

Claims (1)

[Claims] (1) A main bus bar, an auxiliary bus bar attached to the main bus bar, a track line drawn out from the main bus bar, a main bus disconnect switch, a circuit breaker, and a line installed in this line line sequentially from the main bus side. equipment, an auxiliary bus side track line connected from the auxiliary bus bar to the main bus side of a track line disconnector, an auxiliary bus line disconnector provided on the auxiliary bus line line, and an auxiliary bus line. In a gas-insulated switchgear equipped with a bypass line drawn out to a line circuit from a line, and a bypass disconnector provided on the bypass line, the line equipment, the bypass disconnector, and the auxiliary bus disconnector A gas insulated switchgear characterized in that the gas insulating switchgear is characterized in that the gas insulated switchgear is collectively designated as a first gas monitoring classification, and only the main bus disconnector is designated as a second gas monitoring classification.