JPH0614368Y2 - Disconnector with ground switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a disconnecting switch with a grounding switch for use in a gas-insulated switchgear or the like.

[Prior Art] Since a gas-insulated switchgear used for a power receiving facility for buildings is installed in a limited space between columns, it is necessary to make a switchgear used for this switch as small as possible. Therefore, instead of providing the disconnecting switch and the grounding switch separately, a disconnecting switch with a grounding switch is often used.

FIG. 7 schematically shows the structure of a conventional disconnecting switch with a grounding switch. In FIG. 7, 1 and 2 are fixed blades for disconnecting switch and fixing blades for grounding switch respectively, and 3 is a rotary shaft 4. The movable blades 5 and 6 common to the disconnecting switch and the grounding switch provided so as to be rotatable between the fixed blades 1 and 2 are fixed contactors attached to the tips of the fixed blades 1 and 2, respectively. is there. One end of a flexible lead 7 is connected to the movable blade 3,
The other end of is connected to a terminal fitting 8 common to the disconnecting switch and the grounding switch.

In this disconnector with a ground switch, the movable blade 3, the fixed blade 1 and the fixed contactor 5 constitute a disconnector, and the movable blade 3, the fixed blade 2 and the fixed contactor 6 constitute a grounded switch. There is. In the state shown,
The movable blade 3 is not in contact with any of the fixed contacts 5 and 6, and both the disconnector and the ground switch are in the open state. When the movable blade 3 is rotated to the fixed blade 1 side from this state, the movable blade 3 moves the fixed contact 5
When the movable blade 3 is turned to the fixed blade 2 side, the movable blade comes into contact with the fixed contact 6 and the ground switch is turned on.

[Problems to be Solved by the Invention] In the above-described disconnecting switch with a grounding switch, the insulating distances l1 and l2 on both sides of the movable blade 3 in the open position, and the protruding length of the fixed contacts 5 and 6 from the fixed blade. l1 'and l2'
Since it is necessary to secure a distance including the above, there is a problem that a space required for arranging the movable blade and the fixed blade becomes large, which hinders miniaturization.

Further, since two sets of contacts 5 and 6 are required, there is a problem that the cost is increased.

Further, in the conventional disconnecting switch with a grounding switch, the flexible lead 7 is deformed by the rotation of the movable blade to change the insulation distance between the lead and the surrounding charging section, and the current path of the flexible lead is changed. Since the direction of the electromagnetic field changes and the direction of the electromagnetic force acting on the flexible lead changes, these must be taken into consideration when designing the insulation, and there is a problem that the design becomes a surface side.

It is an object of the present invention to provide a disconnecting switch with a grounding switch, which has a small size and a low cost and has an easy insulation design.

[Means for Solving Problems] The present invention, as shown in FIG.
A fixed blade 10 for disconnecting switch and a fixed blade 11 for grounding switch which are arranged with their plate surfaces located on the same plane, and a fixed blade 10 for disconnecting switch and a fixed blade 11 for grounding switch which are provided so as to be rotatable respectively. The movable blade 12 common to the disconnecting switch and the grounding switch, and the fixed blade 10 for the disconnecting switch or the fixing for the grounding switch from the direction along the plane by being attached to the tip of the movable blade 12 and rotating the movable blade. The contactors 13A and 13B that contact the blade 11 and the sliding contactor 14 that constantly contacts the movable blade 12 while the movable blade 12 rotates.
It has and. The contactor 13 is a fixed blade 1 for disconnector.
0 and the fixed blade 11 for the grounding switch, at least one pair of contact pieces arranged to face each other so as to sandwich each blade between them.

[Advantage of the Invention] With the above configuration, in order to secure the insulation distances l1 and l2 between the disconnecting switch fixed blade 10 and the earthing switch fixed blade 11 with the movable blade in the open position. Since the required minimum distance is sufficient, the space required for arranging the fixed blade and the movable blade can be reduced, and the disconnector with a grounding switch can be downsized. Further, since the contactor only needs to be provided on the movable blade side, the cost can be reduced. Further, as described above, by providing the sliding contactor 14 with which the movable blade 12 makes sliding contact in the process of its rotation, a flexible lead is not required, so that the insulation design can be facilitated.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 schematically shows an embodiment of the present invention. In FIG. 1, 10 and 11 are fixed blades for disconnecting switches and fixed blades for grounding switches, which are made of a conductive material, respectively. Are arranged in the same plane and are supported by an insulating support (not shown). Reference numeral 12 denotes a movable blade that is provided between the fixed blades 10 and 11 and is rotatable to the fixed blade 10 side and the fixed blade 11 side. This movable blade is composed of a disk-shaped base portion 12a and a strip-plate-shaped arm portion 12b provided so as to project from the outer peripheral portion of the base portion, and fixed blades 10 and 11 are arranged on the plate surface of the arm portion 12b. It is located on the same plane as the plane. The base portion 12a and the arm portion 12b are made of a conductive material, and a square hole penetrating the central portion of the base portion 12a is formed in the arm portion 12a.
The movable blade and the rotary shaft are joined by being fitted into a prismatic rotary shaft 15 extending in a direction orthogonal to the plate surface of b. The rotating shaft 15 is made of an insulating material, and metal shaft portions having a circular cross section fixed to both ends thereof are rotatably supported by bearing means (not shown), and the rotating shaft 15 is counterclockwise and clockwise in the drawing. By rotating each, the arm portion 12b of the movable blade 12 can be rotated to the disconnecting switch fixed blade 10 side and the grounding switch fixed blade 11 side, respectively.

The tip of the arm portion 12b of the movable blade 12 is an arc (rotating shaft 15) connecting the inner end edges of the fixed blades 10 and 11 so as not to come into contact with the fixed blades when they are rotated toward the fixed blades 10 and 11, respectively. (A circular arc centered on the center) and two sets of contactors 1 that extend at the tip of the arm 12b so as to project parallel to each other from the tip of the arm 12b.
3A and 13B are attached. Each contact has an arm 12
It is composed of a pair of contact piece 13a and 13a '(see FIG. 2) arranged so as to sandwich the tip of b from the thickness direction, and these contact pieces hold the tip of the arm 12b. A spring (not shown in FIGS. 1 and 2) supports and applies a biasing force to the contact pieces in a direction in which the contact pieces approach each other. Contact piece 13
Tapered portions 131 are provided at both ends in the width direction of a and 13a 'so as to open the gap between the contact piece pieces toward the corresponding fixed blade side in a divergent manner. When the fixed blades 10 and 11 are respectively sandwiched between the fixed blades 10 and 11, the fixed blades are brought into lateral contact with each other (from the direction along the plane in which the fixed blades 10 and 11 are arranged). .

When the two sets of contacts 13A and 13B are in sliding contact with the same positions of the fixed blades 10 and 11, the fixed blades are greatly worn. Therefore, in this embodiment, the contacts 13A and 13B are used.
The lengths of B are made different, and the positions of the contact portions of both contacts are made different, so that both contacts are fixed blades 10 and 11
It makes contact with different positions.

On the disk-shaped base portion 12a side of the movable blade 12, there is provided a sliding contact 14 which is in constant contact with the base portion 12a. The sliding contactor 14 is composed of a pair of contactor pieces arranged so as to face each other so as to sandwich the base portion 12a therebetween, and is connected to a fixed conductor 16 supported by an insulating support (not shown).

With the above-described structure, the insulating distances l1 and l between the movable blade 12 and the fixed blades 10 and 11 are maintained with the movable blade 12 placed at the open circuit position shown in the figure.
Since it is only necessary to secure 2, it is possible to reduce the space required for arranging the fixed side element and the movable side element as compared with the conventional disconnector with a grounding switch in which the contactor is arranged on the fixed blade side. It is possible to reduce the size. Further, since the contactor may be provided only on the movable side, the cost can be reduced.

When the base 12a of the movable blade is disc-shaped and the sliding contact 14 is brought into contact with the disc-shaped base as in the above-described embodiment, the sliding contact 14 is provided around the disc-shaped base 12a. Since it can be arranged at an arbitrary position, the sliding contact can be arranged at an appropriate position that does not interfere depending on the positions of the fixed blades 10 and 11, and the design can be facilitated.

Referring now to FIGS. 3 and 4, a more specific embodiment of the present invention is shown. 20 and 21 in FIG.
Is a container of a gas-insulated switchgear, these containers are connected via a partition plate 22, and a three-phase bushing 23 is attached so as to penetrate the partition plate 22 in an airtight manner. The three-phase bushings 23 are arranged side by side in a direction perpendicular to the paper surface of FIG. 3, and the disconnecting switch fixing blade 10 is attached to the end of the through conductor of each phase bushing 23 facing the container 21. A three-phase bushing 24 is attached to the ceiling of the container 21 in an airtight manner, and a fixed blade 11 for grounding switch is attached to the lower end of the through conductor 25 of the bushing 24 for each phase. The fixed blades 10 and 11 of each phase are arranged with their plate surfaces located on the same plane.

Bearings (not shown) provided on the side wall of the container 21 rotatably support the shaft portions 15a at both ends of the prismatic rotating shaft 15, and the three-phase movable blade 12 is attached to the rotating shaft 15. Has been. The structure of the movable blade 12 of each phase is the first
Similar to that described with reference to the drawings, it is composed of a disk-shaped base portion 12a and an arm portion 12b protruding from the outer peripheral portion of the base portion, and its plate surface is the same as the plane on which the stationary blades 10 and 11 of the corresponding phase are arranged. It is located on a plane.

Below the movable blade 12, a fixed conductor 16 supported by an insulating support 26 at the bottom of the container 21 is arranged,
A sliding contactor 14 is attached to the conductor 16 so that the base portion 12a of the movable blade is always in contact therewith. The sliding contact 14 comprises a pair of contact pieces 14a, 14a facing each other with the base 12a of the movable blade in between, and a spring (not shown) for urging the contact pieces 14a, 14a toward each other. And is attached to the conductor 16 by a pin 27. The fixed conductor 16 supporting the sliding contact 14 is connected to another device housed in the container 21 via a connection conductor (not shown). Further, the conductor 25 to which the fixed blade 11 for the ground switch is attached is connected to the ground potential portion outside the container 21 via the ground wire.

At the tip of the arm 12b of the movable blade 12, contactors 13A and 13B as shown in FIGS. 5 and 6 are attached. A pair of contact piece 13a, 1 which constitutes each contact piece
3a 'is consist strip made of a conductive material, contact pieces 13a, 13a' bent portion _13a 1, respectively in the central portion thereof is bent in a U-shaped, 13a ₁ 'are provided. Pair of contact child pieces 13a, 13a 'each bent portion _13a 1, 13a _1' are oppositely arranged in a state where the convex portion side butt back to back, is passed through the bottom of the bent portion _13a 1, 13a ₁ ' Bolts 28 loosely fitted in the holes provided
The contact pressure springs 30 and 30 ′ are fitted to each other. These contact pressure springs 30 and 30 'have bent portions 13a ₁ and
13a ₁ ′ is housed in a recess formed in
It is compressed by a nut 31 that is screwed into. Notches 13a ₂ and 13a are formed at the rear ends of the contact pieces 13a and 13a '.
₂ 'is provided, the bent portions 13a ₁ and 13b _1' is 'projections 13a ₃ and 13a ₃ formed in a hemispherical shape each between' the cutouts 13a ₂ and 13a ₂ are fixed. The contact portion 13 is provided at the tip of the contact piece 13a, 13a '.
a ₄ and 13 a ₄ ′ are provided, and these contact portions 13
The a ₄ , 13a ₄ ′ are adapted to contact the stationary blades 10 and 11. Recesses 12b ₁ and 12b ₁ ′ for accommodating substantially half of the contact pieces 13a and 13a ′ are formed on both surfaces of the front end of the arm 12b of the movable blade 12, and the recess 12 is formed.
b _1, 12b respectively contact the child piece 13a in ₁ ', 13
The rear half of a'is accommodated in a substantially half part. The recess _12b 1 in the front end portion of the arm portion 12b, 12b ₁ 'hemispherical recess _12b 2 formed in the bottom of, 12b _2' in contact child pieces 13a, 'projections _13a of the 3, 13a _3' 13a respectively Pin 3 fitted and provided with the arm portion 12b penetrating therethrough
2 is notches 13a ₂ and 13a of the contact pieces 13a and 13a '
It is fitted to the _{2 '.}

In this embodiment, the protruding length of the contactor 13A from the movable blade is set shorter than the protruding length of the contactor 13B, and the contact portions 13a ₄ , 13a ₄ ′ of both contactors come into contact with the fixed blades at different positions. It is like this.

In this embodiment, the movable blade 12 and the contacts 13A, 1
3B and the fixed blade 10 constitute a disconnector,
The movable blade 12, the contacts 13A and 13B, and the fixed blade 11 constitute a grounding switch.

A lever 32 is attached to the end of the rotary shaft 15, and the lever 32 is connected to an operating device (not shown) via a link 33.

In the containers 20 and 21 shown in FIG. 3, other devices constituting a switch insulation switch are housed, and SF ₆ is contained in each container.
Gas is enclosed at a predetermined pressure.

[Advantages of the Invention] As described above, according to the present invention, since the contactor is provided on the movable blade side, between the fixed blade for the disconnecting switch and the fixed blade for the contact switch, the movable blade in the open position is provided. The minimum distance required to secure the insulation distance between them is sufficient. Therefore, there is an advantage that the space required for arranging the fixed blade and the movable blade can be reduced, and the disconnector with a grounding switch can be downsized.
Further, since the contactor is provided only on the movable blade side, the cost can be reduced. Further, since the flexible lead is eliminated by providing the sliding contact for sliding contact of the movable blade in the process of its rotation, there is an advantage that the insulation design can be facilitated.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing a main part of an embodiment of the present invention, and FIG. 2 shows a cross section of a part of a contactor and a fixed blade with which the contactor contacts in the embodiment of FIG. Cross section, third
FIG. 4 is a cross-sectional view of an essential part showing another embodiment of the present invention, FIG. 4 is a perspective view schematically showing the structure of the movable side element used in the embodiment of FIG. 3, and FIG. 5 is the same embodiment. FIG. 6 is a top view showing the configuration of the contact used, FIG. 6 is a sectional view taken along line VI-VI of FIG. 5, and FIG. 7 is a schematic configuration diagram showing a conventional example. 10 ... Fixed blade for disconnecting switch, 11 ... Fixed blade for grounding switch, 12 ... Movable blade, 13A, 13B
...... Contacts, 13a, 13a '... Contact pieces, 14 ...
Sliding contact, 15 ... Rotating shaft.

Claims (2)

[Scope of utility model registration request] 1. A fixed blade for a disconnector and a fixed blade for a grounding switch, which are arranged with their plate surfaces on the same plane, and to be able to rotate to the fixed blade for the disconnector and the fixed blade for a grounding switch, respectively. A movable blade common to the disconnecting switch and the grounding switch provided in, and a fixed blade for the disconnecting switch or a fixed blade for the grounding switch mounted on the tip of the movable blade from the direction along the plane by the rotation of the movable blade. And a sliding contact which the movable blade constantly slides in contact with the movable blade when the movable blade rotates, and the contactor contacts the disconnecting switch fixed blade and the grounding switch fixed blade. With a grounding switch characterized by comprising at least one pair of contact pieces arranged so as to face each other so as to sandwich the blades between A disconnector. 2. The utility model registration claim, wherein the movable blade has a disk-shaped portion in a portion surrounding a rotation shaft thereof, and the disk-shaped portion contacts the sliding contact. The disconnector with a grounding switch according to item 1.