JPH0345966B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a reduced type opening/closing device.

In general, compact switchgear uses a highly electrically insulating gas such as SF ₆ gas to improve the insulation strength between electrical equipment housed in a sealed container compared to that in the air, thereby reducing the distance between electrical equipment. It is designed to reduce the size of the electric equipment and reduce the installation area of electrical equipment.

As shown in FIG. 1, this type of conventional reduced type switchgear has a shingle breaker 2 disposed inside a sealed container 1, and the shingle breaker 2 is connected to a grounding switchgear 3, 3a, 3b and a disconnector 4. , 4a, the power supply unit 5 and the load unit 6 are electrically connected to each other. In addition, 1
a, 8a, 8b indicate pushing. Since the power supply section 5 is always in a live state, it is isolated from the inside of the closed container 1 by a power supply room 8 partitioned by a shield plate 7.
An operation chamber 9 is integrally formed in the lower part of the airtight container 1 with the bottom plate 1a interposed therebetween, and an operation mechanism (not shown) for the sheath breaker 2 is housed in the operation chamber 9. And inside the airtight container 1 and power supply room 8
It was filled and sealed with an insulating gas 10 such as SF ₆ gas, and the breaker 2 was placed exposed in the atmosphere of this insulating gas 10.

However, according to this type of reduced type switchgear, when inspecting or replacing the shield breaker 2, the shield breaker 2 and the disconnectors 4, 4a are disconnected, and the earthing switch 3, 3a is turned on. After removing the insulating gas from the sealed container 1, the worker crawls into the sealed container 1 and disconnects the breaker 2.
Inspect or replace.

Therefore, according to the conventional reduced type switchgear,
Since a large amount of the insulating gas 10 in the closed container 1 must be removed and reinjected after the work is completed, the effort and expense required to inspect or replace the shingle breaker 2 becomes enormous, which is uneconomical. Furthermore, the sealed container 1 must be made large enough for workers to enter and exit, which not only increases costs, but also requires injecting more insulating gas than necessary. This also constitutes a major constraint on this type of device, which should be miniaturized.

In view of these circumstances, the present invention allows inspection and replacement of shields and disconnectors of a reduced type switchgear to be carried out simply, quickly and easily without the need for removing and injecting a large amount of insulating gas or requiring workers to go in and out. The purpose of the present invention is to provide a reduced type switching device that can be further downsized.

In order to achieve the above object, the present invention provides an airtight container that houses a disconnector for a power supply section and a load section, a grounding switch, a vacuum shield, and a disconnector, and also seals an insulating gas, and a lower end of the container is fixed to the bottom plate of the container. a pole column made of an insulating tube that is opened to the outside and into which the vacuum shield and disconnector are inserted, electrically connected to the earthing switch and the disconnector, and held airtight; and a box body which is connected by sandwiching the lower end of the base plate and the bottom plate, and stores therein the operation mechanism of the vacuum shield and disconnector and maintains the operation mechanism airtightly, and by removing the box body from the pole column part, This is a reduced type switching device that allows the vacuum shield and disconnector in the pole column to be pulled out to the outside of the sealed container without discharging the insulating gas from the sealed container.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 11.

FIG. 2 is a schematic configuration diagram similar to FIG. 1, and the same reference numerals indicate the same parts in the figure, and redundant explanation thereof will be omitted.

Reference numeral 11 denotes a pole column portion, and the pole column portion 11 is a vacuum shield and a disconnector 2.
It is mainly made of an insulating cylinder made of an insulating material and is erected on the bottom plate 1a. Reference numeral 12 denotes a box body that houses the operating mechanism of the vacuum shield disconnector 2, and is airtightly connected to the lower end of the pole column portion 11 and communicates with the inside of the pole column portion 11.

Therefore, the pole portion 11 and the box body 12 will be explained in detail with reference to FIGS. 3 to 10. In FIGS. 3 and 4, reference numeral 13 denotes a mounting flange, and the mounting flange 13 is an annular seat that surrounds a hole 1b formed in the bottom plate 1a and is hermetically fixed to the bottom plate 1a. Reference numeral 14 denotes a lower insulating cylinder, which is fitted inside the mounting flange 13 and fixed with adhesive or the like. Reference numeral 15 denotes a lower terminal tube, and the lower terminal tube 15 is fitted onto the upper part of the lower insulating tube 14 and fixed with adhesive or the like. Reference numeral 16 denotes an upper insulating tube, and the upper insulating tube 16 is fitted onto the upper part of the lower terminal tube 15 and fixed with adhesive or the like. Reference numeral 17 denotes an upper terminal cover, and the upper terminal cover 17 is fitted onto the upper part of the upper insulating cylinder 16 and fixed with adhesive or the like. The lower terminal tube 15 and the upper terminal cover 17 are each made of conductive metal, and the lower insulating tube 14 and the upper insulating tube 16 are insulating tubes made of a pressure-resistant synthetic resin material such as FRP. A vacuum shield breaker 2 is inserted and fixed within this upper insulating cylinder 16. Upper terminal 2 of vacuum disconnector 2
a passes through the fixing plate 18 and is fitted and coupled with a current collector contact 20 attached to the upper terminal cover 17, and the lower terminal 2b is a current collector contact 20a attached to the fixing plate 19 connected to the lower terminal tube 15. It is mated and connected. The upper terminal cover 17 is electrically connected to the load section 6, and the lower terminal tube 15 is electrically connected to the power supply section 5.

The fixing plates 18 and 19 have inner step portions 17c formed on the upper terminal cover 17 and the lower terminal sleeve 15, respectively.
It abuts on the lower end surface of 15a and is fastened via bolts 21 and 22. Figure 5 is B-B of Figure 3.
6 is an enlarged view of section C in FIG. 4. FIG. These fixing plates 18 and 19 are rectangular plates with both short sides formed in an arc shape.
4, 16 and the lower terminal tube 15 in a horizontal position.

In FIGS. 7 to 10 showing the upper terminal cover 17 in detail, 17b is a cover that constitutes the upper terminal cover 17 and is fixed to the main body 17a via screws 23, and the inner surface of the cover 17b is The current collector contact 20 is fixed to the axial center of the housing via a screw 24. Reference numeral 18a denotes a through hole, and the through hole 18a is bored at both ends of the fixing plate 18 on the longitudinal axis. Further, a screw hole 17d is bored in the upper terminal cover 17 facing the through hole 18a.

The fixing plates 18 and 19 are installed so as to cross each other at 90 degrees (see Figures 3 and 4).
), this intersecting arrangement allows the fixing plate 1
A gap 25 is formed in which a long jig can be inserted into the upper insulating cylinder 16 in order to attach and detach the bolt 22 that fastens the terminal cover 8 to the upper terminal cover 17 (FIG. 3).

In FIGS. 3 and 4, reference numeral 26 denotes an insulating connecting portion, and the insulating connecting portion 26 is detachably connected to the lower terminal 2b of the vacuum shield disconnector 2.
Reference numeral 27 denotes an insulating rod, and the insulating rod 27 is integrally formed with the insulating connecting portion 26. Reference numeral 28 denotes an insulating connecting portion, which is integrally formed with the insulating rod 27 and has a connecting fitting 29 at its lower portion. A drive section 32 of a sheath breaker operating mechanism 31 is removably connected to the connecting fitting 29 via a pin 30. Reference numeral 33 denotes a pressure contact spring that constantly presses the insulating rod 27 upward. The box body 12 that houses the breaker operating mechanism 31 is attached to the bottom plate 1 with bolts 34.
It is concluded in a. Reference numeral 35 denotes a case housing an interlocking mechanism, and the interlocking mechanism (not shown) is a known mechanism for simultaneously opening and closing the vacuum shields and disconnectors 2 of the pole column portions 11 arranged in three phases in parallel.

Therefore, in the above configuration, an example of inspecting or replacing the vacuum shield and disconnector 2 will be explained based on FIG. 4 and FIG. , remove the box body 12 from the bottom plate 1a, remove the pin 30, and remove the shingle breaker operating mechanism 31 from the connecting fitting 29. Then, a long guide rod 3 is inserted from the hole 1b of the bottom plate 1a.
6 is inserted into the pole column portion 11 and passed through the gap 25 between the fixed plate 19 and the lower terminal tube 15 to reach the vicinity of the upper terminal cover 17. The upper end of the guide rod 36 is provided with a threaded portion that can engage with the threaded hole 17d (FIG. 9) of the upper terminal cover 17, and the through hole 17d of the fixing plate 18.
8a (FIGS. 9 and 10) has a diameter that allows loose fitting. Therefore, the upper end of the guide rod 36 is passed through the through hole 18a of the fixed plate 18, and the upper terminal cover 17 is inserted.
screw into the screw hole 17d. It is also conceivable that the guide rod 38 may be divided as appropriate and connected when in use.

When the guide rod 36 is installed, the fixing plate 1
8 to the upper terminal cover 17, and bolts 22 to fasten the fixing plate 19 to the lower terminal tube 15.
1 using a long jig. The long jig is operated in substantially the same manner as the guide rod 36 is inserted into the pole section 11 and operated.

When the fixing plates 18 and 19 are free, the insulating rod 27 is pulled downward and the vacuum shield and disconnector 2 are pulled out, as shown in FIG. 11B. At this time, the fixed plate 18 moves horizontally downward along the guide rod 36 through its through hole 18a. Then, when the insulating rod 27 is pulled out almost completely from the pole section 11, the connection between the insulating connecting part 26 and the lower terminal 2b is released, and the insulating rod 27 is removed. Once the insulating rod 27 is removed, the vacuum shield breaker 2 is pulled downward along the guide rod 36 (FIG. 11C) and completely removed from the pole section 11 (FIG. 11D).

Vacuum shields and disconnectors can be inspected in a large area outside the switchgear. After that, in order to store the vacuum shield and disconnector in the pole section 11 again, as shown in FIG. Attach the guide rod 3 to the through hole 18a of the fixing plate 18.
6 through the lower end of the first
Attach the vacuum shield breaker 2 to the pole column 11 by following the steps C→B→A in Figure 1. As shown in FIG. 11A, when the vacuum shield breaker 2 is completely inserted into the pole section 11, the upper terminal 2a is tightly fitted into the current collector contact 20 of the upper terminal cover 17. Therefore, the fixed plate 18,
19 are screwed with bolts 21 and 22 via jigs, respectively, and fastened to the upper terminal cover 17 and the lower terminal tube 15, respectively. When the vacuum shield disconnector 2 is fixed in the pole section 11 in this way, the guide rod 36 is removed, and the vacuum shield disconnector operating mechanism 31 and the connecting fitting 29 are removed.
are connected with pins 30, and the box body 12 is fastened to the bottom plate 1a with bolts 36, and insulating gas is injected into the pole section 11.

As described above, according to the present invention, the bottom plate 1a has an opening on the bottom plate 1a in the closed container 1 filled with the insulating gas 10, and the vacuum shield breaker 2 is made up of the insulating cylinders 14 and 16. Since the pole section 11 is equipped with a
To easily and quickly remove a vacuum shield breaker 2 to the outside of a sealed container 1 by only removing a very small amount of insulating gas from a pole part 11 without removing a large amount of insulating gas 10 inside the sealed container 1. I can do it. Therefore, the effort and expense of removing and re-injecting a large amount of insulating gas 10 from the closed container 1 can be omitted, so that the cost of inspection and replacement work can be reduced. Furthermore,
Since the vacuum shield and disconnector 2 can be taken out and inspected outside the sealed container 1, reliable inspection is possible, and there is no need to create a space for workers to crawl into the sealed container 1, so the tightness of the sealed container 1 is reduced accordingly. It is possible to achieve further downsizing, and the amount of insulating gas sealed in the closed container 1 can be reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a conventional example, FIG. 2 is a schematic configuration diagram of an embodiment of the present invention, FIG. 3 is a longitudinal sectional front view of a pole column portion according to the present invention, and FIG. AA sectional view, FIG. 5 is a BB-B arrow view in FIG. 3, FIG. 6 is a partially enlarged view of section C in FIG. 4, and FIG. 7 is a plan view of the head half of the pole section. , Fig. 8 is a cross-sectional view taken along line B-B in Fig. 7, Fig. 9 is a cross-sectional view taken along line A-A in Fig. 7, Fig. 10 is a half bottom view of Fig. 9, and Fig. 11 A to D are pole views. It is a longitudinal cross-sectional view showing the replacement work process of the vacuum shield and disconnector of the column part. 1...Airtight container, 2...Vacuum chamber disconnector, 3,3
a...Earthing switchgear, 4, 4a...Disconnector, 5...
...Power supply section, 6...Load section, 10...Insulating gas, 1
1...Pole column part, 12...Box body, 13...Lower end part,
14... Insulating tube, 15... Lower terminal tube, 16...
Upper insulating tube, 17... Upper terminal cover, 18, 19...
...fixing plate, 36...guide rod.

Claims (1)

[Claims] 1. A current collector contact 20 is fixed to the upper terminal cover 17 of the pole column part 11, a current collector contact 20a is fixed to the lower terminal tube 15 of the pole column part 11, and the lower end of the pole column part 11 is fixed. are airtightly connected around a hole 1b drilled in the bottom plate 1a, and the upper terminal 2a and lower terminal 2b of the sheath disconnector 2 are respectively fitted to the current collector contacts 20, 20a and housed in the upper insulating cylinder 16. In addition, an insulating rod 27 for opening and closing the sheath breaker 2 is connected to the lower terminal 2b, and a box body 12 housing an operating mechanism 31 of the insulating rod 27 is removably fixed around the hole 1b of the bottom plate 1a. , it is characterized by having a pole column part 11 in which the opening exposed by removing the box body 12 allows the mustard cutter 2 to be moved in the axial direction of the pole column part 11 and pulled out from the bottom plate 1a side. Reduced type switchgear. 2. Fixing the current collector contact 20 to the upper terminal cover 17 airtightly connected to the upper insulating cylinder 16,
A fixing plate 18 having through-holes 18a at both ends is inserted in the lower part thereof, a screw hole 17d matching the through-holes 18a is provided in the upper terminal cover, and the upper insulating cylinder 16
The fixing plate 1 is attached to the lower terminal tube 15 which is airtightly connected to the lower terminal tube 15.
Insert the fixing plate 19 that abuts the inner step 15a in an arrangement that intersects with 8, and fix the current collector contact 20a to the fixing plate 19. The terminals 2b are fitted and housed in the upper insulating tube 16, and the lower end of the lower insulating tube 14, which is airtightly connected to the lower terminal tube 15, is airtightly connected by surrounding the hole 1b bored in the bottom plate 1a. An insulating rod 27 for opening and closing the shingle breaker 2 is connected to the lower terminal 2b that forms the pole column part 11 and protrudes from the fixing plate 19, and the inside of the pole column part 11 is exposed by removing the operating mechanism 31 of the insulating rod 27. A pair of guide rods 36 are respectively passed through the through holes 18a of the fixing plate 18 and screwed into the screw holes 17d to be fixed, and the shingle breaker 2 can be pulled out from the pole section 11 through the guide rods 36. A reduced type switchgear characterized by having a pole section 11 having the following structure.