JPS61203808A - 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] [Technical Field of the Invention] The present invention relates to a gas-insulated switchgear system comprising a plurality of switches such as a circuit breaker, a new line switch, and a grounding device, each of which is provided with an operation box. The present invention relates to devices, and particularly to gas-insulated switchgear that has been improved so that the status of internal components can be checked from the outside using optical fibers.

[Technical Background of the Invention] With the spread of gas insulated switchgear (hereinafter referred to as GIS) in recent years, increasingly advanced functions are required of GIS. In addition, there are still strong demands for economic efficiency and downsizing.

GIS is originally a product designed to be maintenance-free, but when maintaining each device, it is necessary to reliably visually check the open/closed state, that is, the contact parts themselves. For example, according to IEC PUBl 29, in order to confirm the opening/closing position of a disconnector or grounding device, the opening/closing state of the contact part must be visually visible, or the part must be mechanically connected reliably directly to the opening/closing part. It is stipulated that the open/close display of the GIS can be visually checked, and for overseas users, a transparent glass plate is attached to one end of the container so that the open/closed state of the contact part of the GIS disconnector, grounding device, etc. can be visually checked. In many cases, specifications are set to include a viewing window made of resin or the like that allows the interior to be seen through. In addition, some domestic industrial users use it to visually confirm whether or not power is being received at the disconnector, etc. installed on the line at the power receiving end in substation equipment that receives power from the power company.
In some cases, specifications may be established to install a viewing window to check the opening/closing status between poles, similar to the case described above, and in extreme cases, all disconnectors in a substation may be equipped with viewing windows to check the opening/closing status between poles. Some users specify that a .

Incidentally, the degree of miniaturization of GIS in recent years has been remarkable, and each manufacturer is aiming for a rational arrangement of each GIS component, further accelerating the competition for miniaturization. For example, reducing the dimension between each pay in a three-phase integrated GIS, reducing the dimension between phases in a single-phase separated GIS, miniaturizing each operating device, and integrating equipment in which components such as new circuits and grounding devices are housed in an integrated container. With this advancement, GIS has come to have containers filled with SF6 gas installed very close to each other.

[Problems with the Background Art] However, due to the recent trend toward downsizing of GIS as described above, and the provision of a viewing window for checking the opening/closing status of the equipment poles,
There is a trade-off with the requirement to see through the interior, as described below.

a. In order to see through the viewing window, a space must be secured around the viewing window where maintenance personnel can enter.

b. A maintenance stand such as an access floor to get close to the viewing window is required.

The limit to which C1 equipment can be reduced is determined by securing a space around each equipment that allows access to the viewing window, and in extreme cases, the access space may be larger than the equipment dimensions.

d. If you ignore access space and completely downsize the equipment, even if you attach a viewing window to the equipment, there will be other equipment in the vicinity, so it will be physically impossible to get close to the viewing window.

As described above, the provision of an access space for installing a viewing window for confirming the opening/closing status of disconnectors, grounding devices, etc. is a major hindrance to the downsizing of GIS.

Next, conventional GIS will be specifically explained using drawings.

. FIG. 5 is a typical single-line diagram of a double bus system GIS. Between each bus 110Bus 1120BuS and cable head 8CHd, there are disconnectors 1CB, disconnectors 4DS, 10DS, 11DS, 1 grounding device 3ES, 7ES, respectively.
, 9ES are connected.

FIG. 6 is a plan view showing an example of the configuration of the GIS corresponding to FIG. 5, in which the R phase, S phase, and ■ phase are arranged in this order from the lower side of the figure, which is the near side.

FIG. 7 is a side view of FIG. 6. In Figures 6 and 7, each switch 3ES and 4D except for gas breaker 1CB
S, 7ES, 9ES, l0DS.

11DS is provided with viewing windows 301, 401, 701, 901, 101° and 111 at one end in order to check the opening/closing status between the poles, and an access floor 13 for approaching these viewing windows is provided at the R. It is located in Aikai. Note that 12 in the figure is a GIS field control panel.

FIGS. 8 and 9 show schematic configurations of the new circuit device operation box 4DS and the earthing device operation box 3ES, representing each device.

The disconnector container 40 has a movable O-rad 4 grounded therein.
A disconnector viewing window 401 is provided between the opening and closing poles of the movable rod 41 for checking the opening and closing of the grounding device 1, and a grounding device viewing window 301 is provided for checking the opening and closing state of the movable iron of the grounding device (not shown). are similarly provided between the opening and closing poles. In the figure, 42 is an insulating rod, 43 is an insulating shield, and 44 is an insulating spacer.

Approaching the viewing window as shown in Figures 8 and 9,
As mentioned above, in order for maintenance personnel to directly look into the equipment,
An access space, ie an access floor 13 as shown in FIGS. 6 and 7, is required.

The equipment shown in the examples in Figures 6 and 7 is a three-phase batch operation type, and the viewing window is provided only on the R phase to represent each phase. In some cases, installation may also be required for the T-phase and T-phase.
Access space between 8 phases and between S phase and R phase, therefore,
An access floor 13 is required.

By the way, in FIG. 6, the line width W of GIS is the width of the access floor 13, that is, the dimension expanded by approximately 1 m. However, if the access floor 13 is secured for each phase, the line width W is It will expand further. Therefore, securing access space for the viewing window will lead to an increase in the size of the GIS, and if the number of line payouts is large, the length of the busbar will increase, resulting in an increase in the GIS ground space and an increase in cost. It was becoming a big problem.

[Object of the Invention] The present invention was proposed in order to solve the above-mentioned drawbacks of the prior art, and its purpose is to enable maintenance personnel to access the interior of the GIS at a remote location without having to approach the GIS. By enabling visual maintenance, it is possible to achieve highly accurate maintenance, and also to shorten the width and busbar length of the GIS by omitting the access floor, thereby realizing downsizing and cost reduction of the entire GIS. It is an object of the present invention to provide a gas insulated switchgear that has the following characteristics.

[Summary of the Invention] The gas insulated switchgear of the present invention includes a grounded metal container housing a fixed side electrode and a movable side electric bridge of at least one switch, and a movable element that opens and closes between these electrodes. The image receiving end of the image guide made of an optical fiber is placed in a gas-tight position in the vicinity of the opening/closing point of the movable element between the fixed side and movable side electrodes, or in a position where it is possible to monitor areas where products generated by the opening/closing operation tend to accumulate. The image guide is held and provided, and each image guide is guided to the outer edge of the device of the switch, and an eyepiece such as an eyepiece is provided at the end on the outer edge side.

With the above configuration, the opening/closing parts or the accumulation of arc products can be visually observed through the image guide, making it easier to perform more reliable GIS maintenance, and maintenance personnel can Since maintenance can be performed without getting close to the switch, the access floor can be omitted and the width of the GIS and busbar length can be shortened.

[Embodiments of the Invention] Examples of the gas insulated switchgear according to the present invention as described above will be specifically described with reference to FIGS. 1 to 4.

FIG. 1 shows that the present invention is applied to the configuration around the conventional disconnector container 40 shown in FIG. 8, and the portion corresponding to FIG.
FIG.

In FIG. 1, a disconnector viewing window 401 provided at one end of a container 40 is connected to a transparent plate 401 provided to maintain a gas seal.
04, the image receiving end of an image guide 403 made of an optical fiber and the end of a light guide 402 for internal illumination also made of an optical fiber are fixed adjacent to each other. The optical fiber is formed into an integrated optical fiber cable 15, which is fixed to the outer housing 405 and then guided to the outside of the container. The image guide 403 and the light guide 402 are set so that the area between the open and close poles of the disconnector can be partially or entirely within the field of view. Furthermore, an adsorbent 17 for preventing condensation is provided inside the space formed by the outer housing 405 and the transparent plate 404.
is provided.

Similarly, the grounding device viewing window 301 has a structure consisting of a light guide 302, an image guide 303, a transparent plate 304, an external housing 305, an optical fiber cable 16 that integrates these, and an adsorbent 17. .

Further, each optical fiber cable 15, 16 is connected to a conduit 40.
9 and is guided to the GISI 112. An eyepiece is provided at the end of each image guide 303, 403, and is configured so that maintenance personnel can easily view it through eyepieces 307, 407. Light guide light sources 308 and 408 are provided at the ends of the light guides 302 and 402, and light is emitted from this portion and guided into the viewing window 301 and 401.

By having the above configuration, the light guide light source 303 of each light guide 302, 402 is
．． When 403 is turned on, light is irradiated between the open and closed poles through the light guides 302 and 402, and the reflected light is again sent to the GrS board 1 side and 2 sides by the image guide 303 and 403. Therefore, in this way, the light guide light source 308,
When 408 is turned on, if you look through Ivy 307 and 407, you can directly see the open and closed states of each device.

By the way, when the moisture contained in the air inside the external housing 305, 405 condenses due to changes in temperature, this condensation forms on the surfaces of the light guides 302, 402, image guides 303, 403, and transparent plates 304, 404. Not only does it become impossible to irradiate the inside with a sufficient amount of light, but the transparent plate and the image guide receiver become cloudy, making it impossible to guide a clear image to the image guide. In contrast, in this embodiment, as described above, in each viewing window 301, 401, the outer housing 305.405 and the transparent plate 304.40
The above problem is solved by providing an adsorbent 17 for preventing dew condensation inside the space constituted by 4 and 4, respectively.

Furthermore, it is not necessary to use a light guide for internal illumination; for example, the same effect can be obtained by providing a lamp near the transparent plate of the viewing window 301 and 401 and lighting this lamp.

2 and 3 show configuration examples of a GIS in which the present invention is implemented corresponding to the single line diagram in FIG. 5, with FIG. 2 being a plan view and FIG. 3 being a side view. In Fig. 3, operation boxes 3ESj7ES, 9ES of each earthing device and operation 11 of each disconnector are shown.
Optical fiber cable 15 for 4Ds, 10DS, 1108
Through the image guide and light guide at 0.151,
- Leading to GIS board 12. Although not shown in Figure 3, these eyepieces are arranged in the order of the viewing windows of each device.
If it is installed in the IS board 12, maintenance personnel can check the open/closed state of the electrodes inside each device on the GIS board 1 side and the 2 side without having to approach the GIS main body, which simplifies maintenance work.

Therefore, since the open/closed state of the GIS equipment can be checked from the GIS panel side, there is no need for any kind of maintenance work on the Is itself, and therefore no access floor is required at all.

That is, FIGS. 2 and 3 show configuration examples in which no access floor is provided, and in FIG. 2, the line width W is equal to the width of the access floor 13 compared to that in FIG.
It is about 1m narrower.

Therefore, the GIS can be downsized and the length of the main bus bar can also be shortened, which greatly improves economic efficiency.

In addition, in Fig. 3, the eyepiece is provided on the GIS board 12, but these are connected to the GI by using a low-loss optical fiber cable.
It is also possible to lead to the S central monitoring station, etc. In this case, 018
Since the necessary maintenance work can be performed without getting close to the surrounding area, it is possible to effectively utilize human resources by reducing the number of maintenance personnel, which is a huge benefit.

Figure 4 shows the busbar side disconnector 10DS or 1 in Figure 5.
Another embodiment in which the present invention is applied to 1DS will be shown.

In FIG. 4, the disconnector container 30 includes a movable side current collector 3.
1 and a fixed-side collector 32 are disposed to face each other, and a movable member 33 is provided between the art collection electrons 31 and 32 to open and close the art collection electrons.

The mover 33 is connected to the disconnector container 30 via an insulating rod 34.
It is connected to a drive section 35 provided on the upper part of the door, and the opening and closing operations are performed by this drive section 35. Note that 36 is an insulating spacer that supports the conductor.

Further, a viewing window 37 is provided on the side of the container 30, and a transparent plate 371, an image guide 372, a light guide 373, and an optical fiber cable 374 are installed, similar to the embodiment shown in FIG. There is.

Such a bus-side disconnector may cut off the loop current when switching the electric circuit. A loop current interrupter has a relatively long arcing time because a current of an order close to the rated current of the disconnector is interrupted by a new circuit switch having a relatively slow switching speed. Therefore, in the disconnector, arc products due to current switching and metal powder due to switching are generated. As shown in FIG. 4, this product 38 is deposited along the surface of the insulating spacer 36. However, if the product 38 accumulates on the insulating spacer 36, it will reduce its creeping dielectric strength and cause insulation failure. For maintenance purposes, it is necessary to check the amount of i, and when the deposited l reaches a predetermined level according to the number of current interruptions, to disassemble and clean it.

Therefore, the viewing window 37 in the embodiment shown in FIG. 4 is arranged on the side surface of the lower part of the container so that the creeping surface of the insulating spacer 36 below the electrode can be visually observed.

Therefore, as in the embodiment shown in Fig. 1, it is possible to check the creeping state of the insulating spacer 36 of the disconnector without providing an access space, so maintenance can be carried out with a high level of management precision that was previously impossible. It can greatly contribute to the reliability of GIS.

[Effects of the Invention] As explained above, according to the present invention, maintenance personnel can easily access the equipment by providing a simple structure in which an image guide made of optical fiber is provided inside the switch container and the other side is pulled out to the outside of the equipment. Provides gas-insulated rMWi equipment that allows for easy and reliable maintenance without having to get close to the gas-insulated switchgear and reduces the width and bus bar length of the gas-insulated switchgear, resulting in significant downsizing and cost reduction. can.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a disconnector to which the gas insulated switchgear according to the present invention is applied, and FIGS. 2 and 3 respectively show the entire gas insulated switchgear to which the gas insulated switchgear according to the present invention is applied. FIG. 4 is a cross-sectional view showing an embodiment of a new bus line switch to which the gas insulated switchgear according to the present invention is applied, and FIG. 5 is a typical double bus type gas insulated switchgear. Figure 6 is a plan view showing an example of a conventional gas insulated switchgear corresponding to Figure 5, Figure 7 is a side view of Figure 6, and Figure 8 is a diagram of a conventional gas insulated switchgear. FIG. 9 is a cross-sectional view showing a schematic configuration around the disconnector container, and FIG. 9 is a cross-sectional view taken along the line II in FIG. 8. 110Bus, 120Bus...Main bus, 8CHd.
... Cable head, 10B... Breaker, 3ES. 7ES, 9ES...Grounding device, 4DS, 10D8゜1
1O8...Disconnector, 12...Gas insulated switchgear field control panel, 13...Access floor, 15.16,15
0.151...Fiber cable, 17...Adsorbent, 301.401,701,901,101.111・
...Peeping window, 302,402...Light guide, 30
3.403... Image guide, 304.404...
・Transparent plate, 305.405...External housing, 30
7.407... Ivy, 308.408... Light guide light source, 409... Conduit. Figure 1 Figure 3 Figure 4 Figure 5 Figure 7 Figure 6 Figure 8 Figure 9

Claims (6)

[Claims] (1) In a gas-insulated switchgear equipped with multiple switches such as circuit breakers, disconnectors, and grounding devices, at least one switch has a fixed electrode and a movable electrode, and a movable switch that opens and closes between these electrodes. The grounded metal container housing the movable element should be connected to an optical fiber at a position close to the opening/closing point of the movable element between the fixed side and movable side electrodes, or at a position where it is possible to monitor areas where products generated by the opening/closing operation are likely to accumulate. The image receiving end of the image guide is provided in a gas-tight manner, and each of the image guides is led to the outer edge of the device of the switch, and an eyepiece such as an eye bead is provided at the end on the outer edge side. gas insulated switchgear. (2) An image guide is provided corresponding to a plurality of switches, and the eyepiece of each image guide is installed in one place, such as in a storage box or gas-insulated switchgear field control panel, etc. Claim 1, which is contained in
Gas insulated switchgear as described in . (3) The gas insulated switchgear according to claim 1, wherein the grounded metal container is provided with an image guide and internal lighting around the image guide. (4) The gas insulated switchgear according to claim 3, wherein the internal illumination provided around the image guide in the grounded metal container is a light guide made of optical fiber. (5) The image receiving end of the image guide is located in a sealed space formed between a transparent plate installed in a gas-tight manner on the wall of a grounded metal container and an outer cover provided on the outside of this transparent plate. 2. The gas insulated switchgear according to claim 1, wherein the gas insulated switchgear is housed together with a humidity absorbent and is installed facing a transparent plate. (6) The gas insulated switchgear according to claim 1, wherein the eyepiece of the image guide is guided by an optical fiber cable to a substation monitoring station remote from the installation location of the gas insulated switchgear.