JPH0687610B2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a gas insulated switchgear used in a substation.

"Prior Art" Fig. 5 shows a front view of an example of a gas-insulated switchgear conventionally used in a double bus-type substation, and Fig. 5 shows three lines of lines a, b, and c. O of the busbar part,
Fig. 6 shows the P view, and Fig. 7 shows the single-line connection diagram for the three lines, line A, line B, and line C. Note that FIGS. 5 and 6 also show a single-line connection diagram for easy comparison with the single-line connection diagram of FIG. 7 and as an alternative to showing the internal structure. In each figure, 1 is a circuit breaker, 2 is a connecting busbar, 3 is a busbar disconnector, 4
Is a detachable bus bar, and 5 is a movable bus bar using an expandable container having a bellows structure. An insulating spacer 6 supports the inner conductor 7 which is a current-carrying portion, and seals an insulating medium 8 such as SF6 enclosed in each device portion for each device. 9 is a current transformer, 10 is a sending / disconnecting device for the receiving end, 11 is a sending / grounding device for the receiving end, 12 is a lightning arrester, a cable connecting device of 13 or an overhead line connecting part (not shown) Connected to wire 14. Further, 15 is an A bus, 16 is an Otsu bus, which is a bus disconnector 3, a detachable bus 4, a movable bus 5,
An insulating spacer 6 and the like are included. Normally, one of the Kobusen 15 and Otsubusen 16 is operated, and the other is stopped as a standby line. Here, a description will be given of an accident spread range in the case where an electric accident occurs inside the busbar disconnector with three openings while transmitting power on the Kobus15, and a work procedure for accident recovery. It should be noted that the numbers A, B attached after the numbers 1, 2, 3, ... Representing the components of the gas-insulated switchgear are for A and B, respectively. Also, a, b, and c indicate line a, line b, and line c, respectively.

A case where an electric accident occurs inside the busbar disconnector 3A (the hatched portion in FIG. 6) will be described with reference to FIG. The shaded area in FIG. 7 is the accident spread range corresponding to the shaded area in FIG.

If an electrical accident such as a short circuit occurs in the busbar disconnector 3 A, the circuit is interrupted by a circuit breaker (not shown), and the instep 15 is stopped. In addition, the current from the cable connection device 13,
When the current flows in the direction of the upper bus 15, the current transformer 9B detects this and instructs the circuit breaker 1B to operate. As a result, the circuit breaker 1B is activated and the circuit B is also cut off. If you want to immediately restart power transmission on lines other than the faulty line, use the Kobus of each line.
Open the bus disconnector 3 on the 15 side and open the O-bus for each line 16
If you connect the busbar disconnector 3 B on the side of, the lines will be able to operate from Otsu bus 16. However, line 6 is spacer 6
-I can't drive because I have to think that I and B are damaged. The busbar disconnector 3 B must be left open.

Next, the case of restoration will be described with reference to FIGS. Insulating medium 8 such as SF6 in the disconnector 3
Collect. At this time, the insulating mediums 8 of the detachable busbars 4 and 4, the movable busbars 5 and 5, and 5 are also collected at the same time.
Next, remove the detachable busbars 4 and 4, and the blind lids 17 and 17, and remove the inner conductors 7 and 7. The movable busbar 5 is contracted using the elasticity, and the removable busbar 4 and the movable busbar 5
Insulator B, detachable busbar 4 and movable busbar 5 and disconnector 3
Separate from A. The disconnector 3A is now ready for removal. Once repaired, restore in the reverse order of removal. Even during the restoration work, lines other than the line B where the accident occurred can be operated on Otsu bus 16.

"Problems to be Solved by the Invention" In the conventional example as described above, since the insulating medium 8 such as SF6 is separated from the other parts of the busbar disconnector 3 by the insulating spacer 6, the standby There is an advantage that all lines except the faulty line can be restarted immediately by switching to the line, and at the time of the fault recovery, the restoration work can be performed without power outage of other lines. However, since the detachable busbar 4 and the movable busbar 5 are required on both sides of the busbar disconnector 3, there is a drawback that the dimension between the lines must be large and it is not economical. Further, the fact that one connecting 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 impairing economy.

"Means for solving the problem" The circuit breaker and the busbar disconnector are directly connected without passing through the busbar, and a detachable busbar is provided at each connection point for the portion where adjacent busbar disconnectors are mutually connected. Stretchable movable busbars are arranged alternately.

"Operation and Examples" FIG. 1 is a front view of a gas-insulated switchgear used in a double bus-type substation of the present invention, and FIG.
FIG. 3 shows a view of M and N of the bus lines in FIG. 1 for the three lines B and C, and FIG. 3 shows a single-line connection diagram for the three lines A, B, and C. Note that FIGS. 1 and 2 also show a single-line connection diagram for easy comparison with FIG. 3 and as an alternative to showing the internal structure. The lines that exceed three lines are the same, and a description thereof will be omitted. A feature of the present invention is that the circuit breaker and the busbar disconnector are directly connected to each other without a connecting busbar, and an attaching / detaching device at one end of the busbar disconnector,
That is, a movable bus bar is arranged at the opposite end. That is, there is a feature that one connecting busbar, one detachable busbar, and one movable busbar are omitted for each line to improve the economical efficiency, and the dimension between lines is reduced by the omitted amount to reduce the installation area.

The details of the present invention will be described below with reference to FIGS. The description of the same parts as those of the conventional gas insulated switchgear (hereinafter referred to as GIS) will be partially omitted.

In the present invention, the circuit breaker 1 is directly connected to the busbar disconnectors 3A and 3B. 4 is a detachable bus bar, 5 is a movable bus bar, 6 is an insulating spacer, which supports the internal conductor 7 which is a charging part, and also seals the insulating medium 8 such as SF6 enclosed in each device part for each device. It has stopped. 9 is a current transformer, 10 is a sending / disconnecting device for the receiving end, 11 is a sending / grounding device for the receiving end, 12 is a lightning arrester, a cable connecting device 13 or an overhead line connecting part (not shown) Connected to wire 14. Therefore, the circuit breaker 1 has three connection parts between the circuit breakers 3 and 3, and the current transformer 9. If the current transformer 9 is not attached, it will be directly connected to the disconnector 10 for the sending and receiving ends. Since the busbar disconnecting switch 3 side, that is, the side of the busbar 15 and the busbar disconnecting device 3 O side, that is, the Otsubus 16 side, have the same structure, the description of the 16 Otsubus side is omitted. The structure of the former bus line will be described with reference to FIG.
In FIG. 2 which shows a side view of three lines, from the side of the line a, the movable busbar 5a, the busbar disconnector 3a, and the detachable busbar 4 are shown.
Instep B, busbar disconnector 3A, movable busbar 5A, busbar disconnector 3A, and detachable busbar 4A are arranged in this order. That is, the detachable busbar 4 is arranged on one side of the busbar disconnector 3, the movable busbar 5 is arranged at the opposite end, and the busbar disconnector 3 of the next line is arranged next to it. Sandwich it,
The removable busbars 4 and the movable busbars 5 are arranged alternately. In the case of the present invention as well, it is the same as in the prior art that the system is normally operated by either one of the Kobusen 15 or Otsubus 16 and the other is a standby line and is in a stopped state. Here, a description will be given of an accident spread range and an operation recovery procedure in the case where an electric accident occurs inside the busbar disconnector 3A (indicated by a shaded portion in FIG. 2) while the power is being transmitted through the Kobus15. These are the same as in the case of conventional GIS and will be duplicated, but will be described in detail below. In FIG. 3, when an electrical accident such as a short circuit occurs inside the disconnector 3B, the circuit is interrupted by a circuit breaker (not shown) and the instep bus 15 is stopped. When the current flows from the cable connecting device 13 in the direction of the upper bus 15, the current transformer 9B detects this, the circuit breaker 1B operates, and the circuit B also stops. However, since the accident area is confined locally by the insulating spacers 6-1 A, 6-2, and 6-3, it does not affect the Otsu bus line 16 at all. The shaded area in FIG. 3 is the accident area corresponding to the shaded area in FIG. Therefore, by opening circuit breakers 3A and 3A of A bus 15, and disconnecting bus disconnectors 3A and 3A of O16, it becomes possible to operate from O16. If this happens, the insulation spacer 6
-3 If the line B is not damaged, the line B can be operated by opening the bus line disconnector 3 A and inserting the bus line disconnector 3 B, but it is extremely reduced like GIS. It is impractical to assume that the impact of the accident will not affect the insulating spacers 6-3 in the modified equipment. GI
Since S is a hermetically sealed device and the internal state is completely invisible from the outside, it is difficult to confirm the state of damage to the insulating spacer 6. It is practical to think that you cannot drive more than you can confirm.

Line B is an accidental line, and even if a power failure is unavoidable, it is extremely short while other lines, that is, line A and line C, open and close the bus line disconnectors of each line. The fact that power can be restored simply by a power outage over a long period of time has a significant impact on society due to a power outage.

Next, the case of accident recovery will be described. Collect the insulating medium 8 such as SF6 in the busbar disconnector 3A and the circuit breaker 1B where the accident occurred. At this time, the insulating medium 8 of the detachable bus bar 4B and the movable bus bar 5C is also collected. Next, the removable lid 4 blinds 17
Remove the upper shell and take out the inner conductor 7th shell. The inner conductor 7A of the detachable busbar 4B is configured so that it can be easily attached and detached by using a commonly used automatic connection type contact portion structure such as a tulip contactor.
Next, disconnect the detachable busbar 4A and the busbar disconnector 3A by disconnecting the bolts, etc., and use the elasticity of the movable busbar 5C to temporarily move the busbar disconnector 3A. Move in the direction of joint 5 The detachable bus bar 4A is now ready for removal. After detaching the detachable busbar 4A, remove the busbar disconnector 3A to the opposite side, that is, send it to the side where the space is formed. However, insulating spacers 6-1 A, 6-
Do not remove the 1st c.

Insulating spacer 6-2 Insulating medium 8 such as SF6 on one side
Since it has been removed, even if the busbar disconnector 3A is released and the busbar disconnector 3B is inserted, the circuit B cannot be energized. However, if the busbar disconnector 3A is opened, both the insulating spacers 6-2A and 6-2A remain filled with the sound insulating medium 8. Ha can be operated without any difference from Otomo Line 16. That is, even if one pair of detachable busbars and movable busbars are not provided on both sides of the busbar disconnector, if one set of detachable busbars and movable busbars is arranged on both sides of the busbar disconnector, the busbar disconnector 3 The range of power outages that can be placed during an internal electrical accident
It is possible to keep the same range as the conventional one, that is, only to the accident line. This can be dealt with in the same manner even in the case of an internal electrical accident in the busbar disconnector 3B, and even when an accident occurs on the line a or the line c, the removable busbar and the movable line to and from the adjacent line respectively. The same results are obtained by treating the busbar exactly as described above. In the first place, considering that the main purpose of the substation is to configure the dual bus system is to prevent the spread to other lines as much as possible at the time of an accident and at the time of restoration, in the event of an accident and restoration. The configuration, which sometimes does not affect other lines at all, can be said to be extremely suitable for its intended purpose.

FIG. 4 shows another embodiment of the present invention. The busbar disconnecting switches 3 and 3 and the circuit breaker are the same as in FIG.

"Effect of the invention" -Economical because the required number of removable busbars and movable busbars is reduced by one for each line.

-Economical because no bus bar connecting the bus bar disconnectors is required.

-The line-to-line size can be reduced by the amount of the removable busbars and movable busbars.

And other effects.

[Brief description of drawings]

1 is a front view showing an embodiment of the present invention, FIG. 2 is a side view of three lines showing an essential part of FIG. 1, FIG. 3 is a single line connection diagram of three lines of the present invention, and FIG. FIG. 5 is a front view showing another embodiment of the present invention, FIG. 5 is a front view showing a conventional example, FIG. 6 is a side view of three lines showing an essential part of FIG. 5, and FIG. 7 is a conventional example. 3 is a single-line connection diagram for three lines. 1 ... Circuit breaker, 2 ... Connection busbar, 3 ... Busbar disconnector,
4 ... detachable busbar, 5 ... movable busbar, 6 ... insulating spacer, 7 ... inner conductor, 8 ... insulating medium, 9 ... current transformer,
10 …… Sending and disconnecting switch for receiving end, 11 …… Sending and grounding device for receiving end, 12 …… Lightning arrester, 13 …… Cable connecting device, 14 …… External electric wire, 15 …… Ko bus, 16 …… Otsu Busbar, 17 ... blind lid

Claims (1)

[Claims] 1. A gas-insulated switchgear for use in a double-bus type substation consisting of A and O bus lines, which is connected to a plurality of lines, wherein the circuit breaker for each line includes the A and O bus lines. Directly connecting each busbar disconnector, in any of the above-mentioned instep, Otsu busbar, between the adjacent busbar disconnectors, one of the removable busbar and the expandable telescopic movable busbar is alternately arranged. A gas-insulated switchgear characterized by interconnecting these busbar disconnectors.