JPH1079217A - Breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the inter-phase distance when breakers in three phases are laid in line and reduce the space for installation of the breakers. SOLUTION: A vessel 12 for the breaker part is fitted internally with a stationary arc contact 17 and stationary main contact 25 and a movable arc contact 29 and movable main contact 30 which are displaced in the axial directions of the contacts 17 and 25 and contact therewith. The contacts 17 and 25 are arranged so that they do not surround each other, and the outside dimension of the vessel 12 is reduced by installing contacts 17 and 25 in line in the vessel 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker having an arc contact and a main contact.

[0002]

2. Description of the Related Art In a circuit breaker having a relatively small rated breaking current, an arc contact can also serve as a contact for energization. However, in a circuit breaker having a large rated breaking current, in addition to the arc contact, It is necessary to provide a main contact for energization.

FIG. 3 shows an example of a conventional circuit breaker CB having an arc contact and a main contact. In FIG. 3, the right half shows the state at the time of shut-off, and the left half shows the state at the time of closing. As shown in FIG. 3, this type of circuit breaker CB includes a fixed arc contact 1 and a closing position (a position shown in the left half of FIG. 3) in contact with the fixed arc contact 1. In order to be displaceable along the axial direction of the fixed arc contact between an arcing contact and a breaking position (a position shown in the right half of FIG. 3) at a predetermined insulating distance from the arcing contact. The movable arc contact 2, the fixed main contact 3, and the closing position (FIG.
The fixed main contact between the interrupted position (the position shown in the right half of FIG. 3) and the cut-off position (the position shown in the right half of FIG. 3) in which a predetermined insulating distance is left between the fixed main contact and the fixed main contact. And a movable main contact 4 provided so as to be displaceable along the axial direction of the contact 3, and these contacts are housed in a cylindrical blocking unit container 6 together with a predetermined arc extinguishing mechanism 5. ing.

In a conventional circuit breaker of this type, a circuit breaker container 6
The fixed arc contact 1 is supported at the center of a fixed side main circuit conductor 7 provided so as to close the upper end of the
The movable arc contact 2 is provided at the tip of a movable conductor 8 provided so as to be able to displace the central portion of the movable conductor along the axial direction. The fixed main contact 3 is a fixed arc contact 1
Is concentrically surrounded from the outside and is connected to the fixed-side main circuit conductor 7.
Is provided at the distal end of the cylindrical conductor 9 connected to the second conductor.
The movable conductor 8 is connected to a movable main circuit conductor (not shown) via a current collecting electrode (not shown) that is in sliding contact with the movable conductor. SF ₆ gas is sealed in the blocking unit container 6 at a predetermined pressure.

[0005] In this type of circuit breaker, the movable main contact 4 comes into contact with the fixed main contact 3 after the movable arc contact 2 comes into contact with the fixed arc contact 1 at the time of closing, and the movable main contact 4 comes into contact at the time of interruption. The fixed arc contact 1 and the movable arc contact 2, and the fixed main contact 3, such that the movable arc contact 2 separates from the fixed arc contact 1 after leaving the fixed main contact 3.
And the movable main contact 4 are set to have a mutual positional relationship.

In the circuit breaker shown in FIG. 3, when in the closed state shown in the left half of the figure, the fixed main circuit conductor 7-fixed main contact 3-movable main contact 4-movable conductor 8-
The main circuit current flows through the path of the movable main circuit conductor (not shown) and the path of the fixed main circuit conductor 7-fixed arc contact 1-movable arc contact 2-movable conductor 8-movable main circuit conductor (not shown).

When the movable conductor 8 is displaced downward to cut off the main circuit current, the movable main contact 4 is separated from the fixed main contact 3 without generating an arc. Next, when the movable arc contact 2 separates from the fixed arc contact 1, an arc is generated between the two arc contacts, but the arc is extinguished at the current zero point by the operation of the arc extinguishing mechanism 5.

In the illustrated example, the arc extinguishing mechanism 5 is an arc-rotating type in which a magnetic flux generated by exciting an arc driving coil at the time of arc generation is linked to the arc, thereby rotating the arc at high speed and extinguishing the arc. The structure and operation of the arc extinguishing mechanism will be described in detail when describing the embodiment of the present invention.

[0009]

In the circuit breaker shown in FIG. 3, the fixed main contact 3 and the fixed arc contact 1 are concentric with the fixed main contact located outside the fixed arc contact. The outer diameter .phi.D2 of the shut-off container 6 cannot be avoided because it is placed in a cylindrical shape and is housed in the cylindrical shut-off container 6. Therefore, as shown in FIG. 4, when three-phase circuit breakers CBu to CBw are arranged in a line,
There has been a problem that the distance L 'between the phases becomes long and a large space is required to arrange the circuit breaker. In particular, when the three-phase circuit breaker is accommodated in the container of the gas insulated switchgear, the size of the container of the switchgear is unfavorable because of its large size.

[0010] It is an object of the present invention to provide a circuit breaker in which when three phases are arranged in a line, the distance between the phases can be made shorter than before.

[0011]

SUMMARY OF THE INVENTION The present invention is directed to a stationary main contact, which is displaced along the axial direction of the stationary main contact so as to come into contact with or separate from the stationary main contact (contact with the stationary main contact). Or
The movable main contact provided so as to move away from the fixed main contact, the fixed arc contact, and the movable main contact displaced along the axial direction of the fixed arc contact so as to come into contact with or separate from the fixed arc contact. The present invention relates to a circuit breaker in which a movable arc contact provided is housed in a circuit breaker container. In the present invention, the fixed main contact and the fixed arc contact are configured so as not to surround each other, and both contacts are arranged side by side in the blocking unit container with their respective axes parallel to each other. .

As described above, when the fixed main contact and the fixed arc contact are configured so as not to surround each other, and both contacts are arranged side by side, the fixed arc contact and the movable arc of the cut-off portion container are arranged. In the part where the contact is stored,
Since the outer diameter of the container can be reduced as compared with the case where the fixed main contacts and the fixed arc contacts are concentrically arranged, when the three-phase circuit breakers are arranged in a line, the The distance can be shorter than before.

[0013] The shut-off portion container has a cylindrical portion having a peripheral wall portion having a circular cross section and a projecting portion projecting outward from both circumferential ends of the peripheral wall portion of the cylindrical portion. The container can be constituted by an arc contact storage space and a main contact storage space on the inside and the inside of the projection, respectively.

In the case of using such a cutoff container, the fixed arc contact is placed in the arc contact receiving space in the cutoff container with its axis oriented in the same direction as the central axis of the cylindrical portion of the cutoff container. Deploy. The fixed main contact is arranged so that its axis is parallel to the axis of the fixed arc contact and does not surround the fixed arc contact, and is arranged in the main contact storage space in the shutoff portion container.

Further, the movable arc contact is provided at the tip of a movable conductor which is disposed in the arc contact storage space and is supported so as to be displaceable along the axis of the fixed arc contact. The contact main part is arranged in the main contact accommodating space and comes into contact with and separates from the fixed main contact, and the connecting part connects the contact main part to the movable conductor.

With the use of the above-mentioned circuit breaker container, the outer diameter of the circuit breaker container can be made smaller at the cylindrical portion thereof than that of the conventional circuit breaker circuit breaker container. Therefore, when the three-phase circuit breakers are arranged in a line, the distance between the phases can be shortened, and the space for installing the circuit breakers can be reduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the configuration of a main part of a circuit breaker according to the present invention. The right half of FIG. 1 shows a state when the circuit breaker CB is in a cutoff state, and the left half shows a state when the circuit breaker is turned on.

In FIG. 1, reference numeral 11 denotes a container body made of an insulating material. As shown in FIG. 2, the container body 11 has a cylindrical portion 11a having a peripheral wall portion having a circular cross section.
A protrusion 11b protruding outward from both circumferential ends of the peripheral wall of the cylindrical portion. A fixed main circuit conductor 13 is attached so as to hermetically close the opening at the upper end of the container body 11, and a movable main circuit conductor 14 is fixed to an intermediate portion of the container body 11 in the axial direction. The lower end of the container body 11 is airtightly closed by a bottom plate (not shown), and the container body 11, the main circuit conductor 13, and the bottom plate (not shown) form an airtight shutoff container 12. In the shut-off portion container 12, an arc contact accommodating space 12A is formed inside the cylindrical portion 11a of the container main body, and the projecting portion 11 is formed.
A main contact storage space 12B is formed inside b.

The fixed-side main circuit conductor 13 has a contact base 13a for supporting a fixed arc contact protruding inside the cylindrical portion 11a of the cut-off portion container, and a fixed protruding portion protruding inside the protruding portion 11b of the cut-off portion container. A contact base 13b for supporting the main contact is provided. The contact bases 13a and 13b are formed in a columnar shape, and are used to support fixed arc contacts.
a is provided in a state where its central axis coincides with the central axis of the cylindrical portion 11a of the shut-off portion container, and the contact base 13b for supporting the fixed main contact has its central axis parallel to the central axis of the contact base 13a. It is provided in a state where it is made to be.

A contact mounting groove 13a1 is provided on the outer periphery near the tip of the contact base 13a. In the contact mounting groove 13a1, a large number of contact pieces 14,
A projection provided at the rear end of each of the fittings 14 is fitted, and a ring-shaped holding spring 15 and a contact pressure spring 16 are attached so as to surround the contact pieces 14 from the outside. Have been. The contact pieces 14, 14,..., The holding spring 15 and the contact pressure spring 16 constitute a well-known tulip contact, and the tulip contact constitutes a fixed arc contact 17. In this example, the center axis of the contact base 13a and the cylindrical portion 1
Since the center axis of the fixed arc contact 1a coincides with the center axis of the cylindrical portion 11a, the fixed arc contact 17 is disposed inside the cylindrical portion with the center axis thereof coincident with the central axis of the cylindrical portion 11a.

The fixed main circuit conductor 13 is also connected to one end of a cylindrical coil mount 18 that concentrically surrounds the contact base 13a and substantially half of the fixed arc contact 17. The coil mount 18 is made of a highly conductive metal material, and an arc drive coil 19 is fixed to a flange 18a formed at the other end of the coil mount 18. The arc drive coil 19 is provided so as to concentrically surround the fixed arc contact 17, and the lower end of the coil 19 has an arc-shaped traveling plate 2 formed in an annular shape.
0 is attached. One end of the arc drive coil 19 is electrically connected to the coil mount 18 and the other end is electrically connected to the arc traveling plate 20. Coil mount 18, arc drive coil 19, arc traveling plate 20
Thus, a known arc rotating type arc extinguishing mechanism 21 is configured. This arc extinguishing mechanism 21 is similar to the arc extinguishing mechanism 5 used in the circuit breaker shown in FIG.

A contact mounting groove 13b1 is provided on the outer periphery near the tip of the contact base 13b provided on the fixed main circuit conductor 13.
Are provided, and a large number of contact pieces 2 are arranged in a ring.
Each of the projections provided at the rear end of each of 2, 2, ... is fitted in the groove 13b1, and comes into contact with a holding spring 23 formed in a ring shape so as to surround the contact pieces 22, 22, ... from outside. A pressure spring 24 is attached. Contact piece 22,
, And a fixed main contact 25 is constituted by a tulip contact comprising a holding spring 23 and a contact pressure spring 24. The fixed main contact 25 has its central axis lined in the protruding portion 11b of the shut-off portion container with the fixed arc contact 17
Are arranged in a state where they face the same direction as the central axis line of the.

The fixed main contact 2 is also provided on the contact base 13b.
5 is attached, and the potential of the shield 26 is fixed to the same potential as the fixed-side main circuit conductor 13.

A movable conductor 28 formed in a tubular shape is arranged inside the cylindrical portion 11 a of the shut-off portion container with its central axis aligned with the central axis of the fixed arc contact 17. The movable conductor 28 is supported so as to be displaced along the axis of the fixed arc contact 17 while being in sliding contact with the current collecting contact 31 attached to the movable main circuit conductor 14. The tip is a movable arc contact 29 that contacts the fixed arc contact 17 from the inside.
At the tip of the movable arc contact 29, a contact portion 29a made of arc-resistant metal is attached.

The movable conductor 28 is connected to an output of a breaker operating device via an insulating operating rod (not shown) and a suitable connecting mechanism, and the movable conductor 28 is driven by the operating device, thereby forming a movable arc contact. A predetermined position 29 is provided between the input position where the fixed arc contact 17 is brought into contact with the fixed arc contact 17 as shown in the left half of FIG. 1 and the fixed arc contact 17 as shown in the right half of FIG. Can be displaced between the cut-off position and the insulation distance.

The movable conductor 28 has a fixed main contact 25
The movable main contact 30 which comes in contact with and separates from the main body is attached. The movable main contact 30 connects the contact main portion 30a disposed in the main contact housing space 12B with the axis shared with the fixed main contact 25, and connects the contact main portion 30a to the movable conductor 28. A connection position where the contact main portion 30a comes into contact with the fixed main contact 25 from inside with the displacement of the movable conductor 28;
0a can be displaced between a fixed main contact and a cut-off position where a predetermined insulation distance is provided between the main contact and the fixed main contact. SF ₆ gas is sealed at a predetermined pressure inside the shut-off portion container 12.

In the above-described circuit breaker, the movable conductor 28 is fixed to the fixed arc contact from the closed state in which the movable arc contact 29 and the movable main contact 30 are in contact with the fixed arc contact 17 and the fixed main contact 25, respectively. When displaced away from the contact 17, the movable arc contact 29 separates from the fixed arc contact 17 after the movable main contact 30 separates from the fixed main contact 25, and the movable arc contact 29 and the movable main contact When the movable conductor 28 is displaced toward the fixed arc contact 17 from the interrupted state in which the contact 30 is located at a predetermined insulating distance between the fixed arc contact 17 and the fixed main contact 25, respectively. The movable arc contact 29
Contact with the fixed arc contact 17 after the movable main contact 3
0 and fixed arc contact 17 and movable arc contact 29 and fixed main contact 2
5 and the movable main contact 30 are set.

In the above-described circuit breaker, when the movable arc contact 29 and the movable main contact 30 are in contact with the fixed arc contact 17 and the fixed main contact 25, respectively (the closed state), the fixed main circuit conductor 13- Fixed Main Contact 25-
Path of movable main contact 30-movable conductor 28-current collecting contact 31-movable main circuit conductor 14 and fixed main circuit conductor 13
The main circuit current flows through the path of the fixed arc contact 17, the movable arc contact 29, the movable conductor 28, the current collecting contact 31, and the movable main circuit conductor 14. When the movable conductor 28 is displaced away from the fixed arc contact 17 from this state,
First, the movable main contact 30 separates from the fixed main contact 25 without generating an arc.
Move away from the fixed arc contact 17. At the moment when the movable arc contact 29 is separated from the fixed arc contact 17, an arc is generated between the two arc contacts. From the moment the arc contacts the arc traveling plate 20, an arc current flows as an exciting current to the arc driving coil 19, and the arc driving coil 19
Generates magnetic flux. Since this magnetic flux links at right angles to the arc, a strong electromagnetic force acts on the arc, and the arc is rotated at high speed along the arc traveling plate 20. Since the rotation of the arc causes the SF ₆ gas to be blown relatively to the arc, the arc is cooled by the cooling action of the SF ₆ gas, and the arc is extinguished at the current zero point.

The movable main contact 30 and the movable arc contact 2
9 is a fixed main contact 25 and a fixed arc contact 1, respectively.
When the movable conductor 28 is displaced toward the fixed arc contact 17 from a state where a predetermined insulation distance is provided between the fixed arc contact 17 and the movable arc contact 29, the movable arc contact 29 is first moved to the fixed arc contact 17. , And then the movable main contact 30 comes into contact with the fixed main contact 25 to be in the closed state as shown in the left half of FIG. As described above, when the fixed arc contact 17 and the fixed main contact 25 are provided so as not to surround each other, and both fixed contacts are arranged side by side in the shutoff container, the cutoff container container The outer diameter dimension φD1 of the portion (cylindrical portion 11a) where the fixed arc contact 17 and the movable arc contact 29 are arranged is determined by the conventional circuit breaker in which the fixed arc contact and the fixed main contact are arranged concentrically. It can be made smaller than the outer diameter dimension φD2 of the partial container. Therefore, as shown in FIG.
When u, CBv, and CBw are arranged in a line, the projecting portions 11b of the circuit breaker containers of the respective circuit breakers are located on the same side, and the respective cylindrical portions 11a are arranged adjacent to each other. The distance L between the phases can be shortened, and the space for arranging the three-phase circuit breaker can be reduced.

In the above example, one protruding portion 11b protruding to one side from the cylindrical portion 11a is provided on the blocking portion container 11, and the fixed main contact and the movable main contact are arranged in the protruding portion. However, when the current flowing through the main contact is large and the current capacity of the main contact is not sufficient just by providing the fixed main contact and the movable main contact on one side, the peripheral wall of the cylindrical portion 11a of the shutoff unit container 11 may be used. Two protruding portions that protrude outward from two positions 180 degrees apart from each other may be provided symmetrically, and the fixed main contact and the movable main contact may be disposed in both protruding portions.

In the above example, the arc rotary type arc extinguishing mechanism is used. However, as the arc extinguishing mechanism, the internal volume is reduced when the movable arc contact is displaced away from the fixed arc contact. A puffer cylinder is provided, and a puffer type arc-extinguishing mechanism that extinguishes the arc by blowing gas ejected from the inside of the puffer cylinder through a nozzle to the arc, and a booster chamber near the arc generating space is provided to generate arc. Sometimes the self-extinguishing type that raises the pressure in the pressurized chamber by the heat energy and then extinguishes the arc by blowing a high-speed gas flow flowing out of the pressurized chamber to the arc when the pressure rise exceeds a peak. Various types such as an arc extinguishing mechanism or an arc extinguishing mechanism that appropriately combines the principles of these arc extinguishing mechanisms can be used.

[0032]

As described above, according to the present invention, the fixed main contact and the fixed arc contact are configured so as not to surround each other, and both contacts are arranged side by side in the shut-off portion container. When the fixed arc contact and the movable arc contact of the blocking unit container are accommodated, the outer diameter of the container is set so that the fixed main contact and the fixed arc contact are arranged concentrically. It can be made smaller than.
Therefore, when three-phase circuit breakers are arranged in a line,
The distance between the phases can be made shorter than before, and there is an advantage that the space required for arranging the circuit breaker can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration example of a main part of a circuit breaker according to the present invention.

FIG. 2 is a top view showing a state in which the circuit breakers of FIG. 1 are arranged in a line for three phases.

FIG. 3 is a cross-sectional view showing a configuration example of a main part of a conventional circuit breaker.

FIG. 4 is a top view showing a state in which the circuit breakers of FIG. 3 are arranged in a line for three phases.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Container main body which comprises a blocking part container 11a Cylindrical part 11b Projection part 12 Breaking part container 12A Arc contact storage space 12B Main contact storage space 13 Fixed main circuit conductor 14 Movable main circuit conductor 17 Fixed arc contact 21 Arc mechanism 25 Fixed main contact 28 Movable conductor 29 Movable arc contact 30 Movable main contact

Claims (2)

[Claims] A fixed main contact; a movable main contact provided so as to be displaced along the axial direction of the fixed main contact so as to come into contact with and separate from the fixed main contact; and a fixed arc contact. ,
A circuit breaker in which a movable arc contact provided so as to be displaced along the axial direction of the fixed arc contact so as to come into contact with and separate from the fixed arc contact is accommodated in a breaker container, wherein the fixed main contact And the fixed arc contacts are configured so as not to surround each other, and are arranged side by side in the blocking unit container with their respective axes parallel to each other. 2. A fixed main contact, a movable main contact provided so as to be displaced along the axial direction of the fixed main contact so as to come into contact with and separate from the fixed main contact, and a fixed arc contact. ,
In a circuit breaker in which a movable arc contact provided so as to be displaced along the axial direction of the fixed arc contact and to come into contact with and separate from the fixed arc contact is housed in a cut-off container, the cut-off container is A cylindrical portion having a peripheral wall portion having a circular cross section and a projection projecting outward from both ends in the circumferential direction of the peripheral wall portion of the cylindrical portion, and the inside of the cylindrical portion and the inside of the projection portion are formed. Each of the fixed arc contacts has a container having an arc contact storage space and a main contact storage space, and the fixed arc contact has the axis thereof oriented in the same direction as the central axis of the cylindrical portion of the cut-off container. The fixed main contact is configured such that its axis is parallel to the axis of the fixed arc contact and does not surround the fixed arc contact, and the fixed main contact is closed. Inside the container The movable arc contact is disposed in the main contact accommodating space, and the movable arc contact is disposed in the arc contact accommodating space and supported at a tip end of a movable conductor supported so as to be displaceable along an axis of the fixed arc contact. The movable main contact is provided in the main contact storage space, and a contact main part that comes into contact with and separates from the fixed main contact, and a connection part that connects the contact main part to the movable conductor. A circuit breaker characterized by comprising: