JPS62225114A - Gas insulated switchgear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] "Industrial application field" Related to gas insulated switchgear used in substations.

``Prior art'' Figure 5 shows a front view of an example of a gas-insulated switchgear conventionally used in a double-bus type substation. O, P of bus line part
A perspective view is shown in FIG. 6, and a single-line connection diagram for the three lines A and C is shown in FIG.

In addition, a single line diagram is also shown in FIGS. 5 and 6 to facilitate comparison with the single line diagram in FIG. 7 and as a substitute for showing the internal structure. In each figure, 1 is a circuit breaker, 2 is a connection busbar, 3 is a bus disconnector, 4 is a detachable busbar, and 5 is a movable busbar using an expandable container having a bellows structure. The insulating spacer supports the internal conductor 7, which is a current-carrying part, and also seals the insulating medium 8 such as SF6 sealed in each device part for each device. 9 is a current transformer, 10 is a disconnector for the sending and receiving ends, 11 is a grounding device for sending and receiving ends, 12 is a lightning arrester, and 13 is a cable connecting device.
Or, via an overhead line connection (not shown), the external electric wire 14
It is connected to the. Also, 15 is the first bus line, 16 is the second bus line,
It includes a bus disconnector 31, a detachable bus 4, a movable bus 5, an insulating spacer, and the like. Normally, either one of the first bus line 15 and the second bus line 16 is operated, and the other bus line is stopped as a standby line. Here, we will explain the scope of the accident and the work procedure for accident recovery in the event that an electrical accident occurs inside the bus disconnect switch at the third A entrance during power transmission on the A bus 15. The number 1 indicates the component equipment of the gas insulated switchgear.
．． 2. A and B added after 3, ... indicate the A bus line and the O bus line, respectively.

Also, A, 口, and C indicate line A, line day, and line C, respectively.

A case where an electrical accident occurs inside the busbar disconnector 3 inlet (shaded area in FIG. 6) will be explained with reference to FIG. 7.

The shaded area in FIG. 7 is the accident influence range corresponding to the shaded area in FIG.

When an electrical accident such as a short circuit occurs in the first bus disconnector 3, the circuit is interrupted by a circuit breaker (not shown) and the first bus 15 is stopped. Note that if the current flows from the cable connection device 13 in the direction of the upper bus bar 15, the current transformer 90
detects this and instructs the circuit breaker 10 to operate. As a result, the circuit breaker 10 is activated and the line port is also cut off. If you want to immediately resume power transmission on lines other than the faulty line, open the bus disconnector 3A on the bus 15 side of each line, and turn on the bus disconnector 3A on the bus 16 side of each line. Then, each line can be operated from the Otsu bus line 16.

However, the circuit port cannot be operated because it must be considered that the spacer 6-2 inlet is damaged. The busbar disconnector 3 O mouth must be left open.

Next, the case of restoration will be explained with reference to FIGS. 5 to 7. Collect the insulating medium 8 such as SF6 in the opening of the bus disconnector 3 where the accident occurred. At this time, the insulating medium 8 to the removable busbars 4A and 4A and the movable busbar 5A and 5A are also collected at the same time. Next, remove the removable busbar 4A, the blind i17A and 17A8 to the 4A, and take out the internal conductors 7A and 7A8. The elasticity of the movable bus bar 5 is used to reduce the size, and the detachable bus bar 4 A and the movable bus bar 5 A are separated from the disconnector 3 A and the detachable bus 4 A and 5 A are separated from the disconnector 3 A. Now, the third inlet of the disconnector can be removed. After repairs are completed, restore the device in the reverse order of removal. Furthermore, even during the restoration work,
Lines other than the line entrance where the accident occurred can be operated on Otsu bus line 16.

"Problems to be Solved by the Invention" In the conventional example described so far, the busbar disconnector 3 has an insulating medium 8 such as SF6 separated from other parts by an insulating spacer. By switching to the line, operation of all lines except the failed line can be resumed immediately, and there is an advantage that recovery work can be carried out without causing a power outage to other lines when recovering from an accident. However, since a removable busbar 4 and a movable busbar 5 are required on both sides of the busbar disconnector 3, the dimensions between each line must become large and there is a drawback that it is not practical.

Moreover, the fact that one connection busbar 2 and one spacer 6 are required only to connect the circuit breaker 1 and the two busbar disconnectors 3 is also a cause of loss of economic efficiency.

``Means for solving the problem'' In addition to directly connecting the circuit breaker and the bus disconnector without going through the bus, it is possible to connect the circuit breaker and the bus disconnect switch directly without going through the bus, and to attach and detach the bus bar at each connection point for the parts where adjacent bus disconnect switches are connected to each other. Expandable movable busbars are arranged alternately.

"Function and Examples" Fig. 1 shows a front view of the gas insulated switchgear used in a double bus type substation of the present invention, and Fig. The M and N views of the generatrix portion in Figure 1 are
Furthermore, Fig. 3 shows a single-line connection diagram for three lines, lines A, C, and C. Note that a single line diagram is also shown in FIGS. 1 and 2 to facilitate comparison with FIG. 3 and as a substitute for showing the internal structure. Since the lines exceeding three lines are the same, their explanation will be omitted. The features of the present invention are that the circuit breaker and the bus disconnector are directly connected without using a connection bus, and that the bus disconnector is provided with a detachable device at one end and a movable busbar at the opposite end. . That is, one connection busbar, one detachable busbar, and one movable busbar are omitted for each line to improve economic efficiency, and the dimensions between the lines are reduced by the omitted portion, thereby reducing the installation area.

The details of the present invention will be explained below with reference to FIGS. 1 to 3. Note that a description of parts that are the same as those of a conventional gas insulated switchgear (hereinafter referred to as GIS) will be omitted.

In the present invention, the busbar disconnectors 3A and 3B are directly connected to the circuit breaker 1. 4 is a removable busbar, 5 is a movable busbar, and dan is an insulating spacer that supports the internal conductor 7, which is a live part, and SF6 enclosed in each device part.
An insulating medium 8 such as the above is sealed for each device. 9
10 is a current transformer, 10 is a disconnector for the sending and receiving end, 11 is a grounding device for the sending and receiving end, 12 is a lightning arrester, and is connected to an external electric wire via a cable connection device 13 or an overhead line connection part (not shown). 1
Connected to 4. Therefore, the circuit breaker 1 has the disconnector 3
There are three connections between A and B and current transformer 9. Note that if the current transformer 9 is not included, it will be directly connected to the disconnector 10 for the power transmission and reception ends. The bus disconnector 3 A side, that is, the A bus 15 side, and the bus disconnector 3 O side,
That is, since the side of the first bus bar 16 has the same structure, the explanation of the second bus bar side of the first bus bar 16 will be omitted, and the structure of the second bus bar 15 will be explained with reference to FIG. In Figure 2, which shows a side view of three lines, from the line A side, there are movable bus 5 A, bus disconnector 3 A, bus disconnector 4 A, removable bus 4 A, bus disconnector 3 A, movable bus 5. They are arranged in the following order: A-C, bus disconnector 3A-C, and detachable busbar 4A-2.

That is, the bus disconnector 3 is arranged such that the removable bus 4 is placed on one side of the bus disconnector 3, the movable bus 5 is placed on the opposite end, and the bus disconnector 3 for the next line is placed next to it. The removable busbars 4 and the movable busbars 5 are alternately arranged on both sides of the busbars. Even in the case of the present invention, normally the first bus line 15 or the second bus line 1
As in the past, one of the lines 6 is operated as a single line, and the other is a standby line and is in a stopped state. Here, we will explain the scope of the accident and the work procedure for accident recovery in the event that an electrical accident occurs inside the busbar disconnector 3A opening (shaded area in Figure 2) during power transmission on the busbar 15. Although these are the same as in the case of conventional GIS and will overlap, they will be explained in detail below. In Figure 3, disconnector 3
If an electrical accident such as a short circuit occurs inside the upper opening, the circuit will be interrupted by a circuit breaker (not shown) and the upper bus bar 15 will stop. Note that when current flows from the cable connection device 13 to the direction of the upper bus bar 15, the current transformer 90 detects this, the circuit breaker 10 is activated, and the line port is also stopped.

However, the area of the accident was the insulating spacer 6-1 inlet, 6-
Because it is contained locally by the 2nd and 6th inlet,
It has no effect on the bus line 16 at all. The shaded area in FIG. 3 is the accident range corresponding to the shaded area in FIG. Therefore, disconnectors 3A A and 3A of A bus line 15 are opened,
By turning on the bus disconnectors 3 Otsu A and 3 Otsu C for the O bus 16, operation from the O bus 16 becomes possible. At this time, if the insulating spacer 6-3 A port is not damaged in the accident, the line port can be operated by opening the bus disconnector 3 A port and inserting the bus disconnector 3 O port. However, in extremely downsized equipment like GIS,
It is unrealistic to think that the accident will not affect the insulating spacer 6-3 back opening. Furthermore, since the GIS is a sealed device and its internal condition cannot be seen from the outside, it is difficult to confirm whether the insulating spacer has been damaged. It is practical to assume that you cannot drive unless you are sure.

Even though the line inlet is the fault line and a power outage is unavoidable, the time required for the other lines, that is, line A and line A, to open and close the bus disconnect switch for each line is extremely short. The fact that it is possible to recover from a power outage for just an hour has great significance today, as power outages have a greater impact on society.

Next, the case of accident recovery will be explained. Collect the insulating medium 8 such as SF6 in the bus disconnector 3 and the circuit breaker 10 where the accident occurred. At this time, also collect the insulating medium 8 of the exit line 4 A and the movable bus bar 5 A.

Next, remove the blind M17 opening of the detachable busbar 4 opening and take out the internal conductor 7 opening. The inner conductor 7 inlet of the detachable bus 4 is configured to be easily attachable and detachable by using a commonly used automatic connection type contact structure such as a tulip contact. Next, release the connection with the bolts connecting the removable bus 4 inlet and the bus disconnector 3 inlet, and use the elasticity of the movable bus 5 to temporarily move the bus disconnector 3 inlet. Move it in the direction of joint 5A and C.

Now the @ bus bar 4 back opening can be removed.

After removing the removable busbar 4 inlet, send the busbar disconnector 3 inlet to the opposite side, that is, to the side where there is space, and remove it.

However, do not remove the insulating spacers 6-1 A and 6-1 A.

One side of the insulating spacer 6-2's first opening is handled by the insulating medium 8 such as SF6 and is damaged, so even if you release the bus disconnector 3's opening and insert the bus disconnector 3's opening Power cannot be applied to the line port. However, if the bus disconnector 3A opening is left open, a healthy insulating medium 8 remains sealed on both sides of the insulating spacers 6-2A A and 6-2A C, so that the line A and the line C can be operated without any problem from bus line 16. In other words, instead of placing one set of removable busbars and one set of movable busbars on each side of the bus disconnector, if one set of removable busbars and one set of movable busbars are placed on both sides of the busbar disconnector, it is possible to It is possible to limit the range of power outage that can occur in the event of an internal electrical accident to the same range as in the past, that is, only to the line in question. This can be handled in exactly the same way even in the case of an internal electrical accident at the busbar disconnector 3 Otsu exit.
Even if an accident occurs on line A or line C, the same result can be obtained by treating the removable bus and the movable bus between each adjacent line in exactly the same manner as described above. In the first place, the main purpose of creating a substation with a double bus bar configuration is to prevent the spread of an accident to other lines as much as possible in the event of an accident or during recovery. Sometimes the configuration does not affect other lines at all,
It can be said that it fits the purpose extremely well.

Note that FIG. 4 shows another embodiment of the present invention. The connection positions of the busbar disconnectors 3A and 3B and the circuit breaker are the same as in FIG. 1 except that they are different from each other, so a description thereof will be omitted.

"Effects of the invention" - The required number of removable busbars and movable busbars is reduced by one each for each line, making it economical.

・It is economical because there is no need for a bus bar to connect the bus disconnect switches.

・The line-to-line dimension can be reduced by the reduction in the number of detached busbars and movable busbars.

This produces effects such as:

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a side view of three lines showing the main part of FIG. 1, FIG. 3 is a single-line connection diagram for three lines of the present invention, and FIG. Figure 5 is a front view showing another embodiment of the present invention, Figure 5 is a front view showing a conventional example, Figure 6 is a side view of three line segments showing the main part of Figure 5, and Figure 7 is a conventional example. It is a single line diagram for three lines. 1 = Circuit breaker 2 = Connection busbar 3 = Line disconnector 4 = Detachable busbar 5 = Movable busbar 6 = Insulation spacer 7 = Internal conductor 8 = Insulator 9 = Current transformer 10 = Disconnector for sending and receiving ends 11=Grounding device for sending and receiving ends 12=Surge arrester 13
= Cable connection device 14 = External electric wire 15 = Upper bus wire
16=Oto bus line 17=Blind lid patent applicant Takagaku Seisakusho Co., Ltd., +3111 x'7vIJ 弗Z1] Chikuni Sai, i! 5I! 211 Chi-ot area

Claims (1)

[Claims] In electrical equipment used in double bus substations,
In addition to providing a connection to the circuit breaker for each line, a connection to the receiving end equipment, and a connection to the bus disconnectors of A and B, there is no adjacent line between each line on either the A bus or the B bus. A gas insulated switchgear characterized in that removable busbars and extendable movable busbars that connect the busbar disconnectors to each other are arranged alternately.