JP2514554Y2 - Gas insulated switchgear - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a gas-insulated switchgear capable of easily inspecting the switchgear of a gas circuit breaker.

B. Outline of the Invention The present invention relates to a gas-insulated switchgear in which a gas breaker composed of an opening / closing part and an insulating cylinder surrounding the opening / closing part is housed in a sealed metal container filled with an insulating gas. By forming a working hole on the outer peripheral surface of the main body and locking a stopper in a mounting hole provided around the hole, an insulating lid for closing the hole is detachably provided to form an insulating cylinder. The opening and closing parts can be easily inspected simply by removing the insulating lid.

C. Conventional technology The structure of the gas insulated switchgear is shown in Fig. 5 (a) and (b).

As shown in the figure, the gas breaker 17 for three phases is housed in the metal container 1. As the gas circuit breaker, a puffer type gas circuit breaker is used which extinguishes arc by blowing compressed insulating gas to the arc. The gas circuit breaker 17 includes an opening / closing part 2, a conductor tube 3 for connecting the fixed contact side of the opening / closing part 2 to a load (not shown) via a conductor 4, and a movable contact side to a power source (not shown) via a conductor 6. It is composed of a conductor tube 5 for connection and an insulating tube 13 surrounding the opening / closing part 2. The insulating cylinder 13 diffuses the deteriorated insulating gas after being extinguished by being blown to the arc (direct contact with the metal container 1 or the opening / closing part of another phase reduces the insulation performance between the phases and between the top and bottom). It is provided in order to prevent this.

The inside of the metal container 1 is hermetically held via the lids 7 and 8, the lids 9a to 9c closing the handholes 16a to 16c, and the insulating spacers 10 and 11, and filled with an insulating gas. The conductor tube 5 and the like are supported on the lid 8 via a support 12 made of an insulating member.

The opening / closing part 2 needs to be regularly inspected and contacts are exchanged, and is performed as follows. As shown in FIG. 6, after removing the lid 7, the mounting plate 14 and the insulating cylinder 13 are removed.
Then, the conductor tube 3 and the fixed contact 15 are removed from the metal container 1 while the conductor tube 3 and the fixed contact 15 are connected, and the fixed contact 15 is inspected. On the other hand, the movable contact (not shown) located below the opening / closing part 2 in the figure is inspected in the same manner as described above with the lid 8 removed.

D. Problem to be solved by the device However, the conductor tube and the like have to be taken out of the metal container by the work in the narrow space inside the metal container, which requires a large number of detached parts and is poor in workability. Therefore, it takes a lot of time to inspect the opening / closing section and replace parts.

Then, this invention aims at providing the gas insulated switchgear which solved such a subject.

E. Means for Solving the Problems The structure of the present invention for achieving the above object is to fill an insulating gas in an airtight metal container with an insulating gas and to accommodate a gas circuit breaker, and to hold a hand in the metal container. A hole is formed and the handhole is closed with a removable lid, and the gas circuit breaker includes a fixed base and a movable base that are separated from each other.
In a gas-insulated switchgear composed of an opening / closing part provided between a fixed side base and a movable side base, and an insulating cylinder surrounding the opening / closing part, a work hole facing the hand hole is provided on the outer peripheral surface of the insulating cylinder body. While forming the mounting hole around the hole, a stopper is provided on the insulating lid that closes the hole, and the insulating lid is detachably provided on the insulating cylinder body by locking the stopper in the mounting hole. It is characterized in that an insulating cylinder is configured.

F. Operation When inspecting the opening / closing part, open the lid provided in the handhole of the metal container, and then remove the insulating lid, and then touch the inside of the insulating cylinder body through the hole in the insulating cylinder body from the handhole. Insert and check the open / close part in the insulating cylinder body.

After that, the insulating lid is attached in the reverse order to the above, and then the hand hole of the metal container is sealed with the lid, and the insulating gas is filled.

G. Embodiment Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. Since the present embodiment is an improvement of a part of the conventional gas-insulated switchgear, the same parts as those of the prior art are designated by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.

(A) First Embodiment First, a first embodiment will be described with reference to FIGS. 1 and 2. The present invention forms a working hole 20a in the insulating cylinder body 20,
The hole 20a is detachably closed by the insulating lid 20b.

As shown in FIG. 1, the fixed base 21 and the movable base
22 and 22 are provided so as to face each other. The fixed side base 21 is provided with a fixed main contact 23 and a fixed arcing contact 24, and the movable side base 22 is provided with a movable main contact 25, a movable arcing contact 26, a piston 27, a puffer chamber 28, and an insulating nozzle 29. Constitutes the opening / closing part 30.

The insulating cylinder body 20 is provided so as to surround the opening / closing portion 30.
As shown in FIG. 1A, female screws 31a and 32a are formed on opposite sides of the fixed-side base 21 and the movable-side base 22, and both ends of the insulating cylinder body 20 are screwed into the female screws 31a and 32a. As shown in FIG. 1 (b), the insulating cylinder body 20 is mounted by forming circular grooves 31 and 32 on the facing surfaces of the fixed base 21 and the movable base 22, respectively. May be fitted into the circular grooves 31 and 32. In this case, in order to fix the insulating cylinder main body 20, a through hole 33 is formed in the movable side base 22, a tap hole 34 is formed in the insulating cylinder main body 20, and a set screw 35 inserted in the through hole 33 is tapped into the tap hole 34. The insulating cylinder main body 20 is fixed to the movable side base 22 by screwing. A plurality of the set screws 35 are provided in the circumferential direction of the movable side base 22.

The insulating cylinder body 20 has a working hole 20a shown in FIG. 2 (b).
The second part is formed at four places around the hole 20a with the formation of
Mounting hole 20c for mounting the insulating lid 20b shown in FIG.
Is formed. The mounting hole 20c is formed of an insertion hole 20d and a hooking hole 20e formed by cutting out a lower portion of the insertion hole 20d. The insulating lid 20b has a size capable of closing the hole 20a.
In the position corresponding to the mounting hole 20c, four pins 20h having a large diameter portion 20f smaller than the insertion hole 20d and a small diameter portion 20g smaller than the hook hole 20e are formed.

The insulating cylinder body 20 is set so that the holes 20a face the handholes 16a to 16c, respectively, as shown in FIG. 3 (a).
An insulating lid 20b that closes the hole 20a is attached. When the pin 20h is inserted into the mounting hole 20c, the pin 20h is lowered due to its own weight of the insulating lid 20b and is positioned in the hooking hole 20e. Since the large diameter portion 20f is larger than the hooking hole 20e, the insulating lid 20b does not come off.

 The operation of such a gas insulated switchgear will be described.

When inspecting the opening / closing part 30, the lids 9a to 9c of the handholes 16a to 16c are removed as shown in FIG. 3B, and then the insulating lid 20b is lifted and pulled forward. Then pin 2
Since the large diameter part 20f of 0h becomes the height of the insertion hole 20d, the pin 20h
Comes out of the mounting hole 20c. After this, hand hole 16a ~
Inspection and the like are performed by inserting a hand from 16c into the opening / closing part 30 through the hole 20a.

(B) Second Embodiment The second embodiment is for the case where the metal container 1 has only one handhole 16d, and as shown in FIG. 4 (a), each hole 20a is a single handhole. The insulating cylinder main body 20 for three phases is installed so as to face the direction of 16d. Except for the difference in the number of handholes and the direction of the holes 20a of the insulating cylinder body 20, the same as in the first embodiment, and the description of the structure and operation is omitted.

Compared to the first embodiment, if only the lid 9d is opened at the time of inspection, the second embodiment allows the three-phase insulating lid 20b to be opened from the single handhole 16d as shown in FIG. 4 (b). There is a merit that the opening / closing part 30 can be inspected.

H. Effects of the Invention As can be seen from the above description, the gas insulated switchgear according to the present invention has the following effects.

(A) Since the hole is formed in the insulating cylinder body surrounding the opening / closing part and the insulating cover is detachably attached to the hole, the opening / closing part can be directly inspected and parts can be replaced through the hole. Therefore, it is not necessary to take out a part of the opening / closing part to the outside of the insulating cylinder as in the conventional case, and the working time is significantly shortened.

(B) If, for example, a metal container is provided with only one handhole, it is possible to inspect the opening / closing parts for three phases from a single handhole, which reduces the work time for inspection and gas Insulation switchgear manufacturing cost is low.

[Brief description of drawings]

1 to 3 relate to a first embodiment of a gas insulated switchgear according to the present invention. FIGS. 1 (a) and 1 (b) are sectional views of a gas circuit breaker and FIG. 2 (a) is in operation. Fig. 2 (b) is a configuration diagram of the insulating cylinder during inspection, Fig. 3 (a) is a plan view of the gas-insulated switchgear during operation, and Fig. 3 (b) is during inspection. 4A is a plan view of the gas-insulated switchgear of FIG. 4, FIG. 4A and FIG. 4B are related to a second embodiment of the gas-insulated switchgear, and FIG. 4A is a plan view during operation, and FIG. ) Is a plan view during inspection, No. 5
FIGS. 5 and 6 relate to a conventional gas-insulated switchgear, FIG. 5 (a) is a plan view, FIG. 5 (b) is a front sectional view, and FIG. 1 ... Metal container, 17 ... Gas circuit breaker, 20 ... Insulating cylinder body, 20a ... Hole, 20b ... Insulating lid, 20c ... Mounting hole, 20h ...
… Pin, 21 …… Fixed side base, 22 …… Movable side base, 30
...... Opening and closing part.

Claims (1)

(57) [Scope of utility model registration request] 1. A gas shield is provided by filling an insulating gas into an airtight metal container and accommodating a gas circuit breaker, forming a handhole in the metal container, and closing the handhole with a removable lid. The gas insulated switchgear is composed of a fixed base and a movable base that are separated from each other, an opening / closing unit provided between the fixed base and the movable base, and an insulating cylinder surrounding the opening / closing unit. A work hole facing the hand hole is formed on the outer peripheral surface of the main body, and a mounting hole is formed around the hole, while a stopper is provided on the insulating lid that closes the hole, and the stopper is locked in the mounting hole. By so doing, an insulating lid is detachably provided on the insulating cylinder body to form the insulating cylinder, and the gas-insulated switchgear is characterized in that.