JP2007234377A - Aerial multicircuit switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a miniaturizable aerial multicircuit switch allowing design for ensuring an insulation distance between a common bus and the ground to be easily carried out. <P>SOLUTION: In this aerial multicircuit switch, the common bus 35 for the respective phases of a circuit switching part 10 is arranged between a main shaft 28 for applying drive force in switching to a moving contact 24 and the moving contact 24, and electrically connected to the moving contact 24. A fixed contact is arranged on the side opposite to the common bus 35 with the moving contact 24 interlaid. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an aerial multi-circuit switch.

  Conventionally, in a multi-circuit switch, a plurality of circuit switches unitized for each circuit are arranged in parallel in a switch case. The power supply side of each circuit switch is connected to a common bus for each phase. Since the multi-circuit switch is installed on the ground or the like, it has been conventionally required to be as compact as possible.

  Therefore, in the gas multi-circuit switch, the opening / closing part is disposed in a sealed case, and the arc extinguishing gas is sealed in the case, so that the power application site such as the opening / closing part and the sealed case (that is, By reducing the insulation distance from the ground), the entire multi-circuit switch is made compact.

In Patent Document 1, in a gas multi-circuit switch, a configuration is shown in which a bus bar is arranged at the upper part in the case of a switch unitized for each circuit switch.
Further, in Patent Document 2, a common bus is arranged in a sealed case that accommodates each circuit switching part of a gas multi-circuit switch, and a fixed contact is connected to the common bus, and the fixed contact The structure which has arrange | positioned the movable contact which contacts / separates is disclosed.

Further, Patent Document 3 discloses a configuration in which each phase common bus is arranged on the back side of the circuit switching unit in the air multi-circuit switch.
JP 2002-279863 A, (FIG. 1) Japanese Utility Model Publication No. 5-48348, (Fig. 2) Japanese Patent Laid-Open No. 2003-68173, (FIG. 2A)

  By the way, in recent years, in order to prevent global warming, the use of arc-extinguishing gas is avoided, and there is an increasing demand for a multi-circuit switch in the air. However, since the multi-circuit switch in the air does not use arc-extinguishing gas, there is a problem that it is difficult to make it compact because the insulation distance between the power application site such as the switch and the ground cannot be shortened.

  For example, in Patent Document 3, the common bus is configured to be provided on the back side of the circuit opening / closing section, but the insulation distance between the common bus and the back side wall of the switch case is secured to the ground. Therefore, a storage space dedicated to the common bus is required between the back side wall of the switch case and the circuit opening / closing part. Of course, apart from securing the insulation distance between the common bus and the ground, it is also necessary to secure the insulation area between the circuit switching part and the ground, so that the switch case as a whole Has the problem of becoming large.

  Similarly, in the case where the configuration in which the common bus is arranged at the upper portion in the switch case as in the configuration disclosed in the gas multi-circuit switch disclosed in Patent Document 1, the switch is similarly used. A storage space is required between the top plate of the case and the circuit opening / closing portion because of the common bus. Even in this case, as a matter of course, it is necessary to secure the insulation distance between the power supply part of the circuit switching part and the ground separately from the securing of the insulation distance between the common bus and the ground (that is, between the ground). Therefore, there is a problem that the switch case as a whole becomes large.

  Further, in the gas multi-circuit switch disclosed in Patent Document 2, a common bus is disposed in the upper space in a sealed case that accommodates each circuit switch, and an insulation distance a with respect to the top plate of the sealed case of the circuit switch. Are spaced apart. A movable contact that is connected to the common bus and contacts and separates from the fixed contact that extends downward is disposed in the lower space, and further, the main shaft of the lever that drives the movable contact (open / close drive) Ii) is arranged in the intermediate space with an insulation distance b from the common bus.

  When adopting the arrangement configuration of the common bus as in Patent Document 2 in the air multi-circuit switch, since the insulation distance a between the common bus and the top plate of the sealed case of the circuit switch is necessary, It is necessary to secure a space, and there is a problem that the entire switch is enlarged. In addition, an insulation distance a between the common bus and the top plate of the sealed case of the circuit switch, and an insulation distance b between the main shaft (opening / closing drive rod) for driving the movable contact and the common bus are secured. There is a problem that the design work becomes troublesome.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to reduce the size and facilitate the design for securing the insulation distance between the common bus and the ground. It is to provide a medium-multi-circuit switch.

  The invention according to claim 1 is an air multi-circuit switch in which a plurality of circuit opening / closing sections each including a fixed contact and a movable contact contacting and separating from the fixed contact are arranged in parallel. A common bus for each phase of the circuit opening / closing part is arranged between the movable contact and a main shaft that applies a driving force at the time of opening / closing to the movable contact, and is electrically connected to the movable contact, A gist of the air multi-circuit switch is characterized in that the fixed contact is disposed on the opposite side of the common bus with the movable contact in between.

  According to a second aspect of the present invention, in the first aspect, the movable contactor is operatively connected to the main shaft via a link mechanism having an insulating property, and the link mechanism and the common bus bar are contactlessly connected. It is arranged so as to intersect.

  According to a third aspect of the present invention, in the second aspect, the link mechanism includes a drive lever coupled to the main shaft, and an actuation link coupled between the drive lever and the movable contact. Is characterized in that a through part having a through space part through which the common bus bar penetrates without contact is provided.

  According to the first aspect of the present invention, it is only necessary to secure an insulation distance from the main shaft as an insulation distance between the common bus and the ground perpendicular to the phase direction. Work can be done easily. In addition, since the storage space for the common bus is between the main shaft and the movable contact and no storage space dedicated to the common bus is necessary, compared to the case where a storage space dedicated to the common bus is provided outside the circuit opening / closing part, There is an effect that the entire multi-circuit switch can be downsized.

  According to the invention of claim 2, by arranging the link mechanism and the common bus so as to intersect without contact, there is an effect that the operation of the link mechanism is not hindered by the common bus.

  According to the invention of claim 3, the operation link is provided with a penetrating portion having a penetrating space portion through which the common bus bar passes without contact, thereby allowing the common bus bar to pass through without contact, The effect of claim 3 can be easily realized.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, an outer box 2 of an aerial multi-circuit switch 1 installed on a sidewalk or the like is formed in a square box shape, and an opening / closing door (not shown) is provided in an opening 3 on the front surface thereof. In the vertical direction of the outer box 2, the upper space than the substantially central portion is a machine room 4, and the lower space is a cable connection chamber 5 that houses a cable terminal (not shown) for underground power distribution. In this specification, in FIG. 1, the left is left, the right is right, the upper is upper, and the lower is lower.

  In the machine room 4, the abbreviations shown in FIGS. 1, 2, and 6 with respect to the outer box 2 so that a plurality of (5 circuits in this embodiment) circuit opening / closing sections 10 are arranged in parallel in the left and right rows. It is supported via a body case 7 that forms a square box.

  In the main body case 7, switch units U for five circuits are accommodated and fixed in parallel. The switch unit U further includes an opening / closing part unit Us, an automatic drive mechanism unit Ua provided at the upper part of the opening / closing part unit Us, and a manual mechanism unit Uh provided at the front part of the opening / closing part unit Us. Yes.

(Opening / closing part unit Us)
The opening / closing part unit Us will be described.
As shown in FIG. 2 and FIG. 7, the three opening / closing parts 11, 12, 13 constituting the circuit opening / closing part 10 correspond to each phase (U phase, V phase, W phase) in the opening / closing part unit Us. Are arranged side by side in the front-rear direction. The opening / closing parts 11, 12, 13 of each phase are supported by the opening / closing part support frame 15. As shown in FIG. 7, the opening / closing part support frame 15 is separated by a predetermined interval so as to be opposed to each other and connects the pair of side plates 16, 17 disposed at the front and back and the upper ends of the side plates 16, 17. It consists of a top plate 14.

As shown in FIGS. 2 and 4, a pair of support plates 18 and 19 are installed between the upper portions and the lower portions of the left ends of the side plates 16 and 17, respectively.
The opening / closing parts 11, 12, and 13 are the same except that they are attached and fixed to the support plates 18 and 19 with a predetermined distance from each other. The components of the other opening / closing parts 11 and 12 are denoted by the same reference numerals as the components of the opening / closing part 13, and the description thereof is omitted.

  As shown in FIG. 4, a support member 20 for a movable contact is attached and fixed to the support plate 18 along the front-rear direction by bolts. A support member 21 for a stationary contact is attached and fixed to the support plate 19 with bolts. Both support members 20 and 21 are formed of a synthetic resin material having insulation properties.

  A housing recess 22 is formed in the center in the front-rear direction from the lower surface of the front end of the support member 20 to the lower surface of the central portion. The connection terminal 23 is fixed to the front end of the support member 20 so that the lower end protrudes into the storage recess 22. A pair of movable contacts 24 spaced apart from each other by a predetermined distance are supported at the lower end of the connection terminal 23 by a shaft 25 (see FIG. 5). Both movable contactors 24 are formed as blade-type movable contact blades, and an arc-resistant metal 24 a is provided at the lower end of both movable contactors 24.

  A metal main shaft 28 is rotatably installed between the upper portions of the side plates 16 and 17. A portion of the main shaft 28 corresponding to the movable contact 24 is formed in a prismatic shape, and a drive lever 29 made of an insulating synthetic resin is attached and fixed to the portion so as to be integrated. The drive lever 29 includes an attachment portion 29a that is externally fitted to and attached to the main shaft 28, and a pair of lever portions 29b that protrude from both ends of the attachment portion 29a.

  An operating link 30 made of an insulating synthetic resin is connected to the drive lever 29 and the center of the movable contact 24 in the longitudinal direction. The operation link 30 is formed in a Y shape, and as shown in FIGS. 5 and 7, the lower part is inserted between the pair of movable contacts 24 and is rotated with respect to the movable contact 24 by a pin 30 a. It is connected freely. Further, the upper portion from the central portion of the operation link 30 is bifurcated to have a pair of branch portions 31. The space between the branch portions 31 is a space K as a through space portion. As shown in FIG. 5, the pair of branch portions 31 are rotatably connected to the outer surface of each lever portion 29 b by a pin 32.

The drive lever 29 and the operation link 30 constitute a link mechanism L.
The upper end portion of the connection terminal 23 is exposed on the upper surface of the support member 20. In each switch unit U, a common bus bar 35 is fastened and fixed to the upper end surface of the support member 20 by a bolt 36. The common bus bar 35 is arranged so as to extend linearly, and is arranged so as to be parallel to a plane including the movement locus of the movable contact 24. Further, the common bus bar 35 and the main shaft 28 are separated by an insulation distance R.

  That is, the common bus bar 35 is formed in a bar shape from a metal conductor and is open / closed except for the rightmost switch unit U (the leftmost switch unit U in FIG. 6). It arrange | positions so that the space K may be penetrated without contact with respect to the branch part 31 of the action | operation link 30 in the container unit U. The branch part 31 having the space K corresponds to a penetration part.

Note that the rightmost switch unit U is a direction with reference to FIG. 1, and in FIG. 6, is the rightmost switch unit U.
On the other hand, as shown in FIG. 4, a connection terminal 27 penetrates and is fixed to the tip of the support member 21 for the stationary contact. A fixed contact 37 is integrally provided at the upper end of the connection terminal 27. The fixed contact 37 is formed in a plate shape so as to be slightly thicker than the distance between the pair of movable contacts 24, and can be clamped and separated by the pair of movable contacts 24. Placed in position. In the stationary contact 37, an arc-resistant metal 37 a is provided on the surface side facing the movable contact 24 during opening / closing operation. An arc extinguishing device 38 is attached and fixed to the support member 21. The arc extinguishing device 38 is formed by laminating a plurality of magnetic plates having U-shaped notches that can pass through the movable contact 24 at predetermined intervals along the moving direction of the movable contact 24. Is supported by an insulating support member (not shown). The arc extinguishing device 38 is generated between the movable contact 24 and the fixed contact 37 when the movable contact 24 changes from the closing state indicated by the two-dotted line in FIG. 4 to the open state indicated by the solid line in FIG. The arc to be extinguished can be extinguished.

  The connection conductors 39 are fixed to the lower ends of the connection terminals 27 of the respective phases by bolts 39a, and are connected to the bushings 41 protruding from the lower front surface of the main body case 7 via the connection conductors 39. ing.

  Each bushing 41 is connected to a power supply source, a consumer, and other multi-circuit switches (not shown) via a trunk cable, a load connection cable, and a branch cable (not shown), respectively. ing.

  When the switching units 11, 12, and 13 of each switch unit U are in the on state, the power from the trunk cable is sent to each of the remaining four switch units U through each switch unit U and the common bus 35. They are branched and supplied to customers and other multi-circuit switches via branch cables and load connection cables. That is, of the five switch units U, two switch units U function as main circuit switches, and the remaining three switch units U function as branch switches.

  A box-shaped insulating barrier 43 is attached and fixed inside the opening / closing unit Us for each phase. The insulating barrier 43 is made of an insulating synthetic resin. As shown in FIGS. 3A and 7, the insulating barrier 43 is a pair of side walls 43a and 43b that are positioned in the front-rear direction and extend in the vertical direction, and the side walls 43a and 43b. The top plate 43c and the bottom plate 43d that connect the upper and lower portions of the two and the side wall 43e that closes the right side of the side walls 43a and 43b. The insulating barrier 43 has an opening on the left side and is disposed so as to cover the movable contact 24, the arc extinguishing device 38, and the support members 20 and 21, as shown in FIG. .

  Further, as shown in FIG. 6, a plate-shaped insulating barrier 44 is fixed to the left end surfaces of the side plates 16 and 17. The insulating barrier 44 is formed from an insulating synthetic resin, and insulates each other adjacent switch unit U and the main body case 7. In FIG. 3B, the insulating barriers 43 and 44 are omitted for convenience of explanation. In FIG. 2, the insulation barrier 44 is omitted.

  Further, as shown in FIG. 8A, the main shaft 28 has a protruding end 33 that protrudes forward from the side plate 16 through one end of the side plate 16, and the driven lever 34 is provided at the protruding end 33. Is fixed. The main shaft 28 can be turned on and off by the manual mechanism 40 constituting the manual mechanism unit Uh via the driven lever 34, and the automatic drive mechanism constituting the automatic drive mechanism unit Ua. The unit 90 can be turned on and off.

(Manual mechanism unit Uh)
Next, the manual mechanism unit Uh for driving the main shaft 28 will be described with reference to FIGS. 8 (a) and 8 (b).

  The manual mechanism unit 40 constituting the manual mechanism unit Uh includes a handle link 50, an operation lever 52, a spring guide member 54, a compression coil spring 56, and a connection link 57 assembled to the support plate 45 and the auxiliary plate 48. Etc.

  When the manual mechanism 40 is manually turned on, the opening / closing operation handle (not shown) is attached to the handle shaft 49 that is rotatably supported by the support plate 45 and the auxiliary plate 48, that is, from the open position to the closing position, that is, The handle shaft 49 in FIG. 8B is rotated clockwise. Then, the handle link 50 is rotated clockwise while compressing the compression coil spring 56. When the handle link 50 passes the dead point connecting the pins 51 at both ends of the operating lever 52, the operating lever 52 is rotated counterclockwise by the urging force of the compression coil spring 56. As a result, the driven lever 34 is rotated via the connecting link 57, the main shaft 28 is rotated in the closing direction, and the opening / closing parts 11, 12, 13 of the switch unit U are inserted.

  On the other hand, when the opening / closing operation handle (not shown) is attached to the handle shaft 49 when manually opened, the handle shaft 49 in FIG. 8B rotates the opening / closing operation counterclockwise from the closing position to the open position. Rotate in the direction. Then, the handle link 50 is rotated in the counterclockwise direction, the operating lever 52 is rotated in the clockwise direction, and the main shaft 28 is rotated in the opening direction via the connecting link 57 and the driven lever 34. The opening / closing parts 11, 12, 13 of the switch unit U are opened.

(Automatic drive mechanism unit Ua)
Next, the automatic drive mechanism unit Ua installed on the top plate 14 will be described with reference to FIGS. 8 (a), 9, 10 (a), and 10 (b).

  The automatic drive mechanism unit 90 constituting the automatic drive mechanism unit Ua includes a closing coil 60, a trip coil 63, an automatic trip link 65, an operation plate 66, a first closing lever 69, a first closing link 70, and a second. The closing link 72, the second closing lever 77, the connecting lever 83, the latch member 80, and the like.

  10B, when the plunger 74 of the closing coil 60 is instantaneously excited and protrudes, the plunger 74 causes the first closing link 70 and the second closing link 72 to be projected. 9 moves to the position shown in FIG.

  As the plunger pin 73 moves, the second closing link 72 rotates the second closing lever 77 and the solenoid shaft 76 fixed to the second closing lever 77 in the clockwise direction. By this rotation, the connecting lever 83 shown in FIG. 8 (a) is rotated in the same direction, and the connecting member 85 connected to the connecting lever 83 is operated, so that the operating lever 52 is manually turned on. By rotating in the counterclockwise direction, the driven lever 34 is rotated through the connecting link 57, and the main shaft 28 is rotated in the closing direction. As a result, the switching units 11, 12, 13 of the switch unit U are turned on. FIG. 9 shows the position of each member when the automatic drive mechanism 90 is in the closing state, and the automatic trip link 65 is held in contact with the trip pin 71 fixed to the first closing lever 69. Has been.

  In the automatic closing state of FIG. 9, when the automatic release is performed, the plunger (not shown) of the trip coil 63 instantaneously presses the front end portion of the operation plate 66. As a result, the operating plate 66 is rotated in the counterclockwise direction in FIG. 9, so that the latch of the automatic trip link 65 with respect to the trip pin 71 is released. As a result, the actuating lever 52 is rotated in the clockwise direction by the biasing force of the compression coil spring 56, and the driven lever 34 is rotated in the opening direction via the connecting link 57. As the driven lever 34 rotates in the opening direction, the main shaft 28 is rotated in the opening direction. As a result, the opening / closing parts 11, 12, 13 of the switch unit U are opened. Also, the actuating lever 52 shown in FIGS. 8A and 8B is rotated in the clockwise direction, and the second closing lever 77 is rotated in the counterclockwise direction in FIG. It is rotated. As a result, the second closing link 72 is pushed rearward, and the state shown in FIG.

Now, according to the present embodiment, the following effects can be obtained.
(1) In the aerial multi-circuit switch according to the present embodiment, each phase of the circuit opening / closing unit 10 is common between the main shaft 28 that applies a driving force for opening and closing the movable contact 24 and the movable contact 24. A bus bar 35 is arranged to be electrically connected to the movable contact 24. And the fixed contact 37 was arrange | positioned on the opposite side to the common bus-line 35 with the movable contact 24 in between.

  As a result, it is only necessary to secure an insulation distance R (see FIG. 3A) with the main shaft 28 as an insulation distance between the common bus 35 and the ground perpendicular to the interphase direction. The circuit switch design work can be done easily. Further, the storage space for the common bus 35 is a space between the main shaft 28 and the movable contact 24, and a storage space dedicated to the common bus is not necessary. Therefore, a storage space dedicated to the common bus is provided outside the circuit opening / closing unit 10. Compared to the case, the entire aerial multi-circuit switch can be miniaturized.

(2) In the aerial multi-circuit switch of the present embodiment, the common bus bar 35 is arranged in parallel to the plane including the movement locus of the movable contact 24.
As a result, by disposing the common bus 35 parallel to the plane including the movement locus of the movable contact 24, a mechanism for transmitting the driving force of the main shaft 28 to the movable contact 24 (that is, the drive lever 29 and the operating link 30). The interference between the movement locus of the link mechanism L) and the common bus 35 can be eliminated. Further, even when the mechanism is assembled, it is only necessary to arrange the mechanism in parallel with the common bus bar 35. Therefore, the assembly can be easily performed.

  (3) In the present embodiment, the movable contact 24 is operatively connected to the main shaft 28 via the link mechanism L having insulation. Then, the link mechanism L and the common bus 35 are arranged so as to intersect without contact.

As a result, by disposing the link mechanism L and the common bus 35 so as to intersect without contact, the operation of the link mechanism L is not hindered by the common bus 35.
(4) In the present embodiment, the link mechanism L includes the drive lever 29 connected to the main shaft 28 and the operation link 30 connected between the drive lever 29 and the movable contactor 24. The operating link 30 is provided with a branch portion 31 (penetrating portion) having a space K (penetrating space portion) through which the common bus bar 35 penetrates without contact.

As a result, the operating link 30 is provided with the branch portion 31 having the space K through which the common bus 35 penetrates without contact, so that the common bus 35 can penetrate without contact.
(5) In the present embodiment, the common bus bar 35 is formed in a straight line.

  As a result, since the common bus 35 is formed in a straight line shape, when the link mechanism L is assembled, the link mechanism L of any circuit switch is arranged when the common bus 35 is arranged in a contactless manner on the assembled link mechanism L. However, the common bus 35 can be easily arranged without interfering with the link mechanism L.

In addition, you may implement the said embodiment as follows.
In the above embodiment, the branch portion 31 is used as the penetrating portion, but the shape is not limited to this. For example, instead of providing a branch portion as the operation link 30, a through hole through which the common bus bar 35 penetrates the operation link 30 in a non-contact state may be provided.

  Furthermore, it is good also considering a pair of operation link as a penetration part spaced apart, and the space part formed by the separation | spacing as a penetration space part. In this case, the penetrating portion serves as the entire pair of operating links.

  In the above embodiment, each switch unit U is provided for 5 circuits, but 2 to 4 circuits or 6 or more switch units may be provided.

The front view of the air multi-circuit switch of 5th Embodiment. Similarly, the left view of a circuit switch. (A) is a partially omitted sectional view of the circuit switch as seen from the back, and (b) is a partially omitted rear view of the circuit switch. Similarly principal part sectional drawing of a circuit switch. The movable contact of a circuit switch and a perspective view of a common bus. Similarly, the principal part rear view which shows the state which arranged the circuit switch in parallel. The right side view of a circuit switch. (A) is a front view of the switch unit U, (b) is a front view of the manual mechanism unit Uh. Sectional drawing which shows the outline of the automatic drive mechanism unit Ua. (A) is explanatory drawing which shows the transfer from insertion of automatic drive mechanism unit Ua to opening, (b) is explanatory drawing which shows the automatic open state of automatic drive mechanism unit Ua.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Circuit opening / closing part, 24 ... Movable contact, 28 ... Main axis | shaft, 29 ... Drive lever,
30 ... Operating link, 31 ... Branching part (penetrating part), 35 ... Common bus,
37: fixed contact, L: link mechanism, K: space (penetrating space).

Claims (3)

In the air multi-circuit switch in which a plurality of circuit switching units provided with a fixed contact and a movable contact contacting and separating from the fixed contact are arranged in parallel.
A common bus for each phase of the circuit opening / closing part is disposed between the movable contact and a main shaft that applies a driving force to the movable contact during opening and closing, and is electrically connected to the movable contact. ,
An airborne multi-circuit switch, wherein the fixed contact is disposed on the opposite side of the common bus with the movable contact in between. The movable contact is operatively connected to the main shaft via a link mechanism having insulation;
The air multi-circuit switch according to claim 1, wherein the link mechanism and the common bus are arranged so as to intersect without contact. The link mechanism includes a drive lever coupled to the main shaft, and an actuation link coupled between the drive lever and the movable contact;
The air multi-circuit switch according to claim 2, wherein the operating link is provided with a penetrating portion having a penetrating space portion through which the common bus bar penetrates without contact.

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