JPH0676698A - Disconnecting switch and cubicle for enclosing it - Google Patents

Abstract

PURPOSE:To reduce the operating force for a disconnecting switch and to make the switch compact by causing a movable conductor to be rotated to the middle portion between opposite main circuit conductors with its center of rotation located on a plane parallel to a current passing surface, thus connecting and disconnecting the main circuit conductors. CONSTITUTION:Metal fittings 13 are used to hold insulating bases 5a, 6a in place and to secure a disconnecting switch to a cubicle or the like. Main circuit conductors 2, 3 held in place on the respective bases 5a, 6a are arranged in a straight line. Contacts 14, 15, assembled to conductors 2, 3, with contact forces maintained by contact springs 8a, 8b, 9a, 9b, and enclosed in storage portions provided in the respective conductors 2, 3, each comprise a plurality of independent portions. A movable conductor 1a, secured to a shaft 10 (center of rotation) guided by bearing portions 16,17 provided on the respective bases 5a, 6a, has contact planes 1b, 1c each taking the form of an arc located at equal distances from the center of the shaft 10 and whose center is located at the shaft 10. The movable conductor 1a can be rotated from a connecting position A to disconnecting position B by rotating a shaft end portion 10a of the shaft 10 by about 90 degrees using a control mechanism for the shaft 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disconnector and a disconnector storage cubicle.

[0002]

2. Description of the Related Art FIG. 4 shows a disconnector disclosed in Japanese Patent Laid-Open No. 42-1307.
A conventional example as disclosed in the publication is shown. As shown in the figure, the movable conductor 1 that performs the movable opening / closing operation is joined to one side of the main circuit conductors 2 and 3 by a rotatable mechanical means and becomes an electrically conductive body. It is connected.
That is, the main circuit conductors 2 and 3 are fixed to the insulators 5 and 6 fixed to the base 4, and the main circuit conductor 3 is movable mechanically and electrically contacted by the rotation fulcrum pin 7 and the contact spring 8. The conductor 1 is incorporated, and the other side of the movable conductor 1 has a contact spring 9
Thus, the main circuit conductor 2 can be opened and contacted while maintaining necessary contact.

[0003]

The conventional disconnector as described above has the following problems.

(1) In order to increase the current, it is necessary to increase the contact spring force, which increases the operating force.

(2) At a place apart from the center of gravity of the movable conductor,
A large operating force is required because there is the center of rotation of the movable conductor. If the size of the movable conductor is increased in order to cope with a larger current, the operating force is correspondingly increased.

(3) Since there is only one open point, the moving dimension (moving dimension from A to B in FIG. 4) of the movable conductor for maintaining insulation becomes large, and the disconnector installation space becomes large.

(4) The electromagnetic force acting on the movable conductor acts as a torque around the center of rotation of the movable conductor, but this torque becomes a torque for rotating the movable conductor in one direction.
An increase in mechanical strength against the torque and a mechanical structure are required.

(5) Further, the cubicle for accommodating such a disconnector is also large because the disconnector is large.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a disconnecting switch for large currents and a disconnecting switch housing cubicle that can be compact with a low operating force.

[0010]

The above-mentioned object is to make the movable conductor longer in the direction of the axis of rotation than the width in the direction perpendicular to the axis of rotation, and to provide the intermediate portion between the main circuit conductors arranged opposite to each other. This can be achieved by rotating around a plane parallel to the current-carrying surface with a center of rotation and contacting and separating the main circuit conductors via multipoint sliding contacts.

Further, a disconnecting switch to be housed is provided with a movable conductor for contacting and separating at least a pair of main circuit conductors arranged opposite to each other, and a movable conductor parallel to a current-carrying surface at an intermediate portion between the pair of main circuit conductors arranged opposite to each other. This is achieved by arranging so as to have the center of rotation on a flat surface.

That is, according to the first aspect of the present invention, the structure in which the center of rotation of the movable conductor is arranged at a point where the weight of the movable conductor is balanced is adopted to eliminate the rotational torque acting on the movable conductor due to electromagnetic force.

According to a second aspect of the present invention, a structure is provided in which the center of rotation of the movable conductor is provided while keeping a part of the insulating base insulated.

According to a third aspect of the present invention, the electromagnetic force generated in the movable conductor by the energization becomes the same on the left and right sides of the rotation center of the movable conductor, and the direction of the force for rotating the movable conductor is opposite. I am trying.

According to the fourth and fifth aspects, the sliding type multi-point contactor structure is adopted.

In the sixth and seventh aspects, the cubicle is downsized by the mounting arrangement of the disconnector of the present invention.

[0017]

Since the above-mentioned means is provided, not only the weight of the movable conductor can be balanced, but also there is no influence of the torque due to the electromagnetic force, and the installation space can be reduced.

That is, (1) By adjusting the weight balance of the movable conductor, the operating force does not increase even if the movable conductor is made large to cope with a large current.

(2) Since the electromagnetic force acting on the movable conductor is balanced on the left and right with the rotation axis of the movable conductor as the central axis, it does not become a torque for rotating the movable conductor. Therefore, it is possible to eliminate the load force due to the electromagnetic force that acts on the operation means of the disconnector and the erroneous disconnection prevention means when the disconnector is closed.

(3) By using a part of the insulating base as a bearing for the center of rotation of the movable conductor, downsizing and reduction in the number of parts can be achieved.

(4) Since the contactor is a sliding type multipoint contactor, the contact stability is improved while the contact force is reduced.

(5) By using the disconnector of the present invention,
The disconnector arrangement can be facilitated, and the degree of freedom of the cubicle arrangement is improved.

[0023]

EXAMPLES Next, the present invention will be specifically described with reference to Examples.

[Embodiment 1] FIGS. 1 to 3 show an embodiment of the present invention. Since the same parts as those of the prior art are designated by the same reference numerals, the description thereof will be omitted. In the present embodiment, the movable conductor 1a is rotated with the rotation center 10 on a plane parallel to the current-carrying surface in the middle portion between the main circuit conductors 2 and 3 which are arranged opposite to each other, and the movable conductor 1a is moved between It was made to contact and separate (see FIG. 1). Further, the disconnecting switches 11a to 11f to be housed are provided with a movable conductor that connects and separates at least a pair of main circuit conductors that are arranged to face each other, and a movable conductor that is parallel to a current-carrying surface at an intermediate portion between the pair of main circuit conductors that are arranged to face each other. It is configured to rotate with a center of rotation on a flat surface (see FIGS. 2 and 3). By doing so, the electromagnetic force acting on the movable conductor 1a when the current i flows as shown in FIG.
electromagnetic force F1 acting between b and the center of rotation and the movable conductor 1
The electromagnetic force F2 acting between the tip 1c of a and the center of rotation is of the same magnitude and in the same direction on the paper surface. As the rotational force acting on the movable conductor 1a, F1 is clockwise and F2 is counterclockwise. Cancel each other out. Therefore, the movable conductor 1a
The rotating force due to the electromagnetic force does not act on, and the influence of the electromagnetic force can be eliminated. Further, since the movable conductor 1a is balanced in weight with respect to the center of rotation, the rotating force due to gravity can be eliminated. Further, since the installation space can be reduced, it is possible to obtain the large-current disconnectors 11a to 11f and the disconnector storage cubicles 12a to 12c that can be made compact with a low operating force.

That is, in FIG. 1 showing the disconnector of the present embodiment, 13 is a metal fitting for fixing the insulating bases 5a, 6a, and this metal fitting 13 is used for fixing the disconnector to a cubicle or the like. The main circuit conductors 2 and 3 fixed on the insulating bases 5a and 6a are arranged in a straight line. Contact springs 8a, 8b, 9a, 9b are provided on the main circuit conductors 2, 3 while keeping contact force with the contact springs 8a, 8b, 9a, 9b. It is composed of. The contact surfaces 1b, 1c of the movable conductor 1a fixed to the shaft 10 (center of rotation) guided by the bearings 16, 17 provided on the insulating bases 5a, 6a are
Is equidistant from the center and has an arc shape centered on the axis 10. The shaft 10 can rotate the movable conductor 1a from the closed state A to the open state B by rotating the shaft end portion 10a of the shaft 10 by about 90 ° by an operating mechanism (not shown).

The movable conductor 1a is in a position parallel to the main circuit conductors 2 and 3 in the closed state, and has a right angle in the opened state.

FIG. 2 is a single-line connection diagram when a cubicle incorporating the disconnector of the present invention is used, and FIG. 3 is a structural diagram of a cubicle incorporating the disconnector of the present invention.

In FIG. 2, 12a, 12b, 12c
Shows a cubicle incorporating a feeder circuit breaker 18, and 12d shows cubicles 12a, 12b, 12
The spare cubicle when one of the c has a power failure is shown. 19 is each cubicle 12a, 12b, 12
Reference numeral 20 denotes a bus connecting the c and 12d, and 20 denotes an output of the standby cubicle 12d and the feeder cubicles 12a to 12a.
It is a backup bus that outputs to 2c. Disconnector 11a,
Reference numerals 11b and 11c are normally closed, and open when the spare cubicle 12d is used. Disconnector 1
1d, 11e, and 11f are normally open, and are closed only when the spare cubicle 12d is used.

In FIG. 3, a conductor 21 connects between the circuit breaker 18 and the bus bar 19. The disconnector 11a is the conductor 2
2 is connected to the circuit breaker 18. The disconnector 11d is connected to the disconnector 11a by a conductor 23 and also serves as an external cable terminal connection terminal. The spare bus bar 20 connected to the disconnector 11d is fixed only by the disconnector 11d without using a supporting insulator in the middle. Disconnector 11
"a" and "11d" are installed on the same plane so as to move in parallel.

As described above, according to this embodiment, the following effects can be obtained.

(1) The electromagnetic force acting on the movable conductor of the disconnector has the same magnitude on the left and right sides of the center of rotation and the direction of the rotational torque is opposite, so that it does not act on the movable conductor as a rotational force. Therefore, it is possible to eliminate the load force due to the electromagnetic force that acts on the operation means of the disconnector and the erroneous opening prevention means when the disconnector is closed. That is, it can be the same as the unloaded state, and the operating means can be downsized.

(2) Since the contact surface of the movable conductor is arcuate, the operating force due to the sliding friction with the contact is small, and it can be used for low operation.

(3) A large current can be easily dealt with by increasing the length of the movable conductor and the number of contacts.

(4) Since the disconnector is fixed to the surface parallel to the axis of the movable conductor, the movable conductor may be lengthened even if the current increases, and the dimension in the depth direction does not need to be changed. The same applies when a plurality of disconnecting switches are provided side by side.

(5) As for the insulation dimension between the main circuit conductors in the open state, since the two points are in the open state, the open dimension per point can be made small and the disconnecting switch as a whole can be downsized. The distance from the ground metal in the installed state can be reduced, and the cubicle can be downsized.

(6) Board width 5 even for large currents of 4000 A, etc.
Since two units can be mounted in a cubicle in parallel with each other at 00 mm, and the main circuit conductor can have a function of a supporting insulator, the degree of freedom in arranging the cubicles can be improved.

[0037]

As described above, according to the present invention, the movable conductor is rotated with the center of rotation on a plane parallel to the current-carrying surface in the middle portion between the main circuit conductors arranged to face each other, and Since it is configured to contact and separate, the weight of the movable conductor can be balanced, the torque due to electromagnetic force does not affect the installation space, and the installation space can be reduced. A disconnector and a disconnector storage cubicle for electric current can be obtained.

[Brief description of drawings]

1 shows an embodiment of the disconnector of the present invention (a)
Is a side view and (b) is a plan view.

FIG. 2 is a single wire connection diagram of a cubicle incorporating the disconnector of the present invention as an embodiment of the disconnector storage cubicle of the present invention.

3A and 3B show an embodiment of a disconnector storage cubicle of the present invention, wherein (A) is a front view and (B) is a side view.

FIG. 4 is a plan view showing a conventional disconnector;
(B) is a side view.

[Explanation of symbols]

1a ... Movable conductors, 2, 3 ... Main circuit conductors, 5a, 6a ...
... Insulation base, 10 ... Shaft (center of rotation), 11a-11
f ... disconnector, 12a-12c ... cubicle, 12d ...
Spare cubicles, 14, 15 ... Contactors, 16, 17 ...
Bearing part.

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Haruo Honda 1-1-1, Kokubun-cho, Hitachi-shi, Ibaraki Hitachi Co., Ltd. Kokubun factory (72) Inventor Takashi Shiina 1-1-1, Kokubun-cho, Hitachi-shi, Ibaraki No. 1 inside the Kokubun Plant of Hitachi, Ltd. (72) Inventor Yukio Kugo 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubun Plant of Hitachi, Ltd. (72) Tsutomu Sugano 1-chome, Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 No. 1 in Hitachi Kokubu Plant, Ltd.

Claims (7)

[Claims] 1. An insulating base, at least a pair of main circuit conductors fixed on the insulating base and facing each other with a predetermined distance therebetween, and a movable conductor for contacting and separating the main circuit conductors. In a disconnecting switch provided, the movable conductor is supported on an insulating base in a freely rotatable state, and main circuit conductors that electrically open and close both ends of the movable conductor are mounted on the insulating base, and a rotation axis of the movable conductor is provided. A disconnector which is characterized in that the lengths of the movable conductor and the main circuit conductor in the direction are longer than the width of the width direction of the movable conductor in the direction perpendicular to the rotation axis. 2. The disconnector according to claim 1, wherein a bearing portion that supports the movable conductor is provided on a part of an insulating base that fixes the main circuit conductor. 3. An electromagnetic force generating means for exerting an electromagnetic force of the same force in the same direction on both sides of the movable conductor when a current flows through the main circuit conductor and the movable conductor. The disconnector according to Item 2. 4. The disconnector according to claim 1, wherein the disconnector has a contact on the main circuit conductor side that comes into contact with the movable conductor as a multipoint sliding contact. 5. The multi-point sliding contact on the main circuit conductor side has contact points on the movable conductor side and is arranged so that the contact points are in a straight line. The disconnector according to 4. 6. A disconnector storage cubicle for storing a disconnector, wherein the disconnector to be stored is one of claims 1 and 2.
The disconnector disconnecting cubicle according to claim 3 or 4, which is mounted on the same plane such that the rotating axes of the movable conductors are parallel to each other. 7. The disconnector storage cubicle according to claim 6, wherein the disconnector storage cubicle comprises a plurality of row boards.