JPH05103404A - Gas-insulated switch - Google Patents

Abstract

PURPOSE:To provide an excellent gas-insulated switch capable of minimizing the suspension time in an accident to a gas-insulated bus. CONSTITUTION:Gas-insulated buses(GIB) 11 and 21 of a phase separation type and a GIB 31, a spare phase for one phase of the same mode as these buses, are arranged in parallel at least for one line inside the tunnel laid in the ground. The ends of the GIBs 11 and 21 of the phase separation type which are led out from the tunnel through a vertical shaft are connected to the closing facilities 14 and 24 of a sub-station or a closing station. For example, the ends of the GIBs 11 and 21 of the phase separation type are connected to the closing facilities 14 and 24 through first disconnectors 12 and 22. In this case, second disconnectors 13 and 23 are arranged on a branch line on the side of the closing facilities 14 and 24 of the first disconnectors 12 and 22, and the end of the spare phase GIB 31 is connected to the other ends of the second disconnetor 13 and 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear, and more particularly to a gas-insulated pipeline bus installed inside a cavern laid underground, and this gas-insulated pipeline bus and a substation or switchgear. The present invention relates to a gas-insulated switchgear having an improved connection structure with a power station.

[0002]

2. Description of the Related Art A gas-insulated switchgear is a high-voltage energizing conductor or switch between a grounding metal container and a grounding metal container by filling a grounding metal container with a gas having excellent insulating properties such as SF ₆ gas. This device is designed to reduce the insulation distance. Among such gas-insulated switchgear, the gas-insulated pipeline busbar is a unit unit by insulating and supporting a high-voltage conducting conductor inside a cylindrical grounded metal container by insulating support means such as an insulating spacer. Forming a plurality of unit units,
After assembling by various methods at the site, SF inside
It is completed by enclosing a gas with excellent insulation performance such as ₆ gas.

Conventionally, a gas-insulated pipeline bus has a gas-insulated switchgear which constitutes a main switchgear mainly in a substation or a switchgear, and a transformer or a transformer provided separately from the gas-insulated switchgear. It is used to connect to the air bushing. FIG. 5 is a diagram showing an example of such an application. In FIG. 5, an iron tower 53 for drawing in the overhead wire 52 is erected at a position away from the gas insulated switchgear 51.
2 is connected to the bushing 54. The gas-insulated switchgear 51 and the bushing 54 are connected by a gas-insulated pipeline bus 55. On the contrary,
In the past, overhead lines 52 or power cables as shown in FIG. 5 were adopted as transmission lines connecting substations and switchyards.

On the other hand, in recent years, the maximum transmission voltage is 5 in order to cope with the rapid increase in the electric power demand in the central area.
The introduction of the 00 kV system into the central part of the city has been planned, and the gas-insulated pipeline bus line is drawing attention as the power transmission line. In other words, the gas-insulated pipeline bus has the advantages that it does not require a steel tower, generates less heat when energized with a large current, and allows overload energization when it is applied to a transmission line. Therefore, it is beginning to be considered to install such a gas-insulated pipeline bus inside a cave laid underground.

[0005]

However, as described above, when the gas-insulated pipeline bus bar is installed inside a cave that is laid underground, it is very difficult to restore the gas-insulated pipeline bus bar in the event of an accident. Therefore, it is necessary to suspend the operation of the transmission line for a long time. Such long-term power line outages are a major obstacle to the social obligation of stable power supply.

The present invention has been proposed in order to solve the problems of the prior art as described above, and an object thereof is to install a gas-insulated pipeline bus bar inside a cavern laid underground. In the gas-insulated switchgear in which the switchgear of a substation or switchyard is connected to the end of this gas-insulated pipeline bus, it is possible to minimize the downtime of the transmission line in the event of a gas-insulated pipeline bus accident. , To provide an excellent gas-insulated switchgear.

[0007]

A gas-insulated switchgear according to the present invention encloses a gas having an excellent insulating property in a metal container at ground potential, and a high-voltage conductor by an insulating spacer or other insulating supporting means. At least one line of gas-insulated conduit busbar that is insulated and supported with respect to the metal container,
In a gas-insulated switchgear installed inside a cave that is laid underground, and at the end of the gas-insulated pipeline busbar is connected to a switchgear at a substation or switchyard, the gas-insulated pipeline busbar is , Each phase separation type gas insulated pipeline busbar, and
A gas-insulated pipeline busbar for one phase having the same form as that of each phase-separated gas insulated pipeline busbar is provided inside the cave, in parallel with each of the phase-separated gas insulated pipeline busbars, and a backup phase gas-insulated pipe. It is characterized as being installed as a road bus.

A first disconnector for connecting the phase-separated gas-insulated pipeline bus bar to the switchgear is provided at an end of the phase-separated gas-insulated pipeline bus bar on the side of the switchgear. A second disconnector is installed on the switchgear side of the first disconnector, branching from a main circuit from the phase-separated gas-insulated pipeline bus to the switchgear. It is desirable that the end of the backup phase gas insulation conduit busbar is connected to the lead-out end of the second disconnector opposite to the main circuit.

[0009]

The operation of the gas-insulated switchgear of the present invention having the above construction is as follows. That is, first, even if an accident occurs in the gas-insulated pipeline bus installed inside the cave, the gas-insulated pipeline bus of the present invention is a phase-separated type gas-insulated pipeline bus. It is possible to minimize the spread range. In addition, in the present invention, since the phase-separated gas-insulated pipeline busbars constituting the circuit have the same phase of the spare phase gas-insulated pipeline busbars, the accidental phase is separated in the event of an accident. , The operation can be continued by switching to the spare phase, while the recovery work of the accident phase can be performed. Therefore, the operation stop time of the power transmission line can be reduced to only the time required to switch from the accident phase to the backup phase.

Particularly, when the first and second disconnectors are installed in connecting the switchgear at the substation or switchgear to the gas-insulated pipe busbar, switching from the accident phase to the backup phase is performed by the gas. It can be easily carried out only by opening and closing the disconnector, without disassembling the insulating conduit busbar. In this case, the switching time is only the time required for the opening / closing operation of the disconnector, so that the operation stop time of the power transmission line can be shortened to the minimum.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A typical embodiment of the gas-insulated switchgear according to the present invention will be described below with reference to FIGS. First, FIG. 1 is a cross-sectional view showing a gas-insulated conduit bus bar (hereinafter abbreviated as GIB) installed inside a cave according to the present invention. As shown in FIG. 1, the phase-separated GIBs 11 and 21 for two lines and the spare-phase GIB
31 is installed horizontally in a horizontal cavern 41. The phase-separated GIBs 11 and 21 and the spare phase GIB 31 for two lines are arranged so that the axes of the phases are parallel to each other. More specifically, each phase-separated GIB for two lines
11 and 21 are arranged on both sides of the axis of the cavern 41 so that the axes of the respective phases in the respective lines are arranged in a line in the vertical direction.
They are arranged symmetrically with respect to this axis. Further, the backup phase GIB31 is arranged at a position higher than the uppermost phase of each of the phase-separated GIBs 11 and 21 for two lines, just above the axis of the cave 41. In addition, these GIB11-31 are GIB provided in the cave 41.
It is supported and fixed at the predetermined position as described above by the supporting means 42.

FIG. 2 and FIG. 3 are constructed at the connecting portions between the ends of the phase-separated GIB 11 and 21 and the backup phase GIB 31 for the two lines shown in FIG. 1 and the main switching equipment of the substation or switching station. FIG. 3 is a plan view showing a layout configuration of the switching equipment for switching the GIB, and a side view taken along arrow A thereof. That is,
Each phase-separated GIB11, 21 for two lines and spare phase GI
B31 is led to the ground from the inside of the cavern 41 as shown in FIG. 1 through the shaft 43 as shown in FIGS. 2 and 3. And each phase separation type GIB11,21 for two lines
At the end of each phase of the first disconnector 1 according to the invention
2 and 22 are installed, and the first disconnector 12 and 2
A main circuit is formed via 2 to the main switchgear of a substation or switchgear (not shown). Further, on the main switching equipment side (not shown) of the first disconnectors 12 and 22, second disconnectors 13 and 23 branching from the main circuit are installed, and further, the second disconnector 13 is provided. , 23 are connected to the lead-out ends on the opposite side of the main circuit from the spare phase GIB31.

FIG. 4 is a single wire connection diagram of the gas-insulated switchgear shown in FIGS. 1 to 3, and 14 and 24 in the figure are circuit breakers constituting the main switchgear at a substation or switchgear. As shown in FIG. 4, the second disconnectors 13 and 23 are arranged at a branch portion between the first disconnectors 12 and 22 and the circuit breakers 14 and 24.

The operation of the gas-insulated switchgear according to this embodiment having the above-mentioned structure is as follows. That is, in the cave 41, the phase-separated GIBs 11 and 21 for two lines are separated.
If an accident occurs in each of the phase-separated GIBs 11 and 21 for two lines by installing the spare phase GIB31 of the same form as the above, the GIB of the accident phase is separated and the spare phase GIB
The operation can be continued by switching to the IB31, while the GIB recovery work in the accident phase can be performed. Therefore,
The operation stop time of the power transmission line in this embodiment is G in the accident phase.
Since only the time required to switch from the IB to the spare phase GIB31 is required, the operation stop time at the time of an accident can be reduced compared to the conventional technology that requires a long time to stop the operation of the transmission line until the restoration work is completed. It can be reduced significantly.

Particularly, in this embodiment, FIG. 2 to FIG.
As shown in FIG. 1, the first line is attached to the end of each of the phase-separated GIBs 11 and 21 for two lines derived from the cave 41 through the shaft 43.
The disconnectors 12 and 22 are provided, and the second disconnector is branched from between the first disconnector 12 and 22 and the circuit breaker 14 and 24.
Since the second disconnectors 13, 23 are provided and the second disconnectors 13, 23 are connected to the preliminary phase GIB31, the first disconnectors 12, 22 and the second disconnectors 13, 23 are The switching from the accident phase GIB to the spare phase GIB31 can be quickly performed by appropriately opening and closing the disconnecting switch corresponding to the accident phase. For example, when an accident occurs in the first phase of the phase-separated GIB11 of one line, this GIB
When 11 becomes unusable, the first phase of the first disconnecting switch 12 is opened and the first phase of the second disconnecting switch 13 is closed, thereby preserving the GIB 11 of this accident phase. Phase GI
You can quickly switch to B31. Therefore, the power transmission stop time can be shortened to the minimum.

The present invention is not limited to the above-mentioned embodiment, and the specific arrangement of GIBs can be selected as appropriate, and the arrangement for switching the preliminary phase GIBs can be changed as appropriate. Further, the present invention is not limited to the configuration in which the GIBs for two lines are installed in the cave, and is similarly applicable to the configuration in which GIBs for one line or three or more lines are installed, and a spare for two or more phases is provided. A configuration in which the phase GIB is provided is also possible.

[0017]

As described above, according to the present invention, each phase-separated gas-insulated pipeline bus is installed inside the cave, and a spare-phase gas-insulated pipeline for one phase of the same form as these is provided. The busbars are installed in parallel, and further, between these gas-insulated pipeline busbars and the switching equipment of the substation or switchyard, the first,
By installing the second disconnector, it is possible to provide an excellent gas-insulated switchgear that can minimize the downtime of the power transmission line when the gas-insulated line bus accident occurs.

[Brief description of drawings]

FIG. 1 is a view showing a typical embodiment of a gas-insulated switchgear according to the present invention, and in particular, a cross-sectional view showing a gas-insulated pipeline bus (GIB) installed inside a cave.

2 shows the same embodiment as FIG. 1, in particular FIG.
GI, which is configured to connect the end of the gas-insulated pipeline bus (GIB) to the main switching equipment of the substation or switchyard.
The top view which shows the arrangement structure of the switching equipment for B switching.

FIG. 3 is a side view taken along the arrow A of FIG.

FIG. 4 is a single wire connection diagram of the gas-insulated switchgear shown in FIGS. 1 to 3.

FIG. 5 is a plan view showing a conventional gas-insulated switchgear.

[Explanation of symbols]

11, 21 ... Phase-separated GIB (phase-separated gas-insulated pipeline bus) 12, 22 ... First disconnector 13, 23 ... Second disconnector 14, 24 ... Circuit breaker 31 ... Preliminary phase GIB ( Preliminary phase gas-insulated pipeline bus) 41 ... Cave 42 ... GIB support means 43 ... Vertical shaft

Claims (2)

[Claims] 1. At least one line in which a gas having an excellent insulating property is sealed in a metal container at ground potential, and a high-voltage conductor is insulated and supported with respect to the metal container by an insulating spacer or other insulating supporting means. Gas insulated pipeline busbar is installed inside a cave that is laid underground, and a switchgear of a substation or switchyard is connected to the end of the gas insulated pipeline busbar. In the above, the gas insulation pipeline bus bar is each phase separation type gas insulation pipeline bus bar, and the gas insulation pipeline bus line for one phase of the same form as each phase separation type gas insulation pipeline bus bar is A gas-insulated switchgear installed inside a cave as a backup phase gas-insulated pipeline bus parallel to the phase-separated gas-insulated pipeline bus. 2. A first disconnector for connecting the phase-separated gas-insulated pipeline bus bar to the switchgear is provided at an end of the phase-separated gas-insulated pipeline bus bar on the side of the switchgear. A second disconnector is installed on the switchgear side of the first disconnector, branching from a main circuit from the phase-separated gas-insulated pipeline bus to the switchgear. The gas insulated switchgear according to claim 1, wherein an end of the backup phase gas insulation conduit busbar is connected to a lead-out end of the second disconnector opposite to the main circuit.