JP6618874B2 - Vacuum circuit breaker - Google Patents

Description

  The present invention relates to a vacuum circuit breaker suitable for use in a power receiving / transforming facility.

  There exists a thing of patent document 1 as background art of this technical field. In the abstract of this document, the structure that allows stroke adjustment with the vacuum switch assembled is “movable drawn from a vacuum vessel containing a fixed-side conductor having a fixed contact and a movable-side conductor having a movable contact”. A cylindrical insulating frame that houses a vacuum valve with a stroke adjustment part that adjusts the contact pressure between the fixed contact and the movable contact between the side conductor and the insulating rod connected to the drive mechanism of the movable side conductor. A fixed-side terminal connected to the fixed-side conductor and a movable-side terminal connected to the movable-side conductor are provided on the side surface thereof, and the side surface is opposed to the stroke adjusting portion. An insulating frame for a vacuum switchgear that is provided and has an opening that can be adjusted by entering a tool necessary for adjusting the adjusting portion is described.

JP 2008-293865A

  In Patent Document 1 described above, as shown in FIG. 2 and the like of the same document, the fixed-side conductor connected to the fixed side of the vacuum valve has a lead-out port provided on one side of the insulating frame, and the opposite side, That is, there is described a vacuum switchgear having a structure in which two points are supported by an inner surface depression of an insulating frame provided on the side surface on the operation mechanism side and then bolted in the vicinity of the outlet.

  In this configuration, since the fixed-side conductor, which is the power application unit, is fitted in the inner surface depression of the insulating frame facing the operation mechanism, there is a possibility that a discharge from the ground potential to the operation mechanism case may occur. In order to avoid this, it is effective to sufficiently increase the insulation distance from the inner surface depression of the insulating frame to the facing position of the operation mechanism case. In Patent Document 1, the distance from the inner surface depression of the insulation frame to the upper end is effective. This has been achieved for a long time.

  However, as a result, in Patent Document 1, the size of the insulating frame is increased, leading to an increase in size of the vacuum switchgear main body using the insulating frame and a power receiving panel for storing the main body.

  An object of the present invention is to provide a vacuum circuit breaker that can achieve downsizing while ensuring insulation performance between a fixed-side conductor and a ground potential case.

In order to solve the above-described problems, a vacuum circuit breaker according to the present invention includes a vacuum valve that is energized when a fixed-side contact and a movable-side contact included therein are brought into contact, and a fixed that is electrically connected to the fixed-side contact. A side conductor plate, an insulating frame that covers the vacuum valve, and a drive mechanism unit that is adjacent to the insulating frame and drives the movable contact, and the fixed side conductor plate is opposite to the drive mechanism unit side. cantilever structure der fixed to the insulating frame on the side is, the fixed-side conductor plate, so that the connection portion between the stationary contact is positioned lower than the fixed portion between the insulating frame, a plurality of locations and it features that you have bent at.

  ADVANTAGE OF THE INVENTION According to this invention, the vacuum circuit breaker which can improve insulation performance and assembly work efficiency can be provided. Problems, configurations, and effects other than those described above will be described in the following examples.

It is a sectional side view of the vacuum circuit breaker of Example 1. It is a front view for one phase of the vacuum circuit breaker of Example 1. It is a top view for one phase of the vacuum circuit breaker of Example 1. It is a sectional side view of the vacuum circuit breaker of Example 2. It is a front view for one phase of the vacuum circuit breaker of Example 2. It is a top view for one phase of the vacuum circuit breaker of Example 2. It is a sectional side view of the vacuum circuit breaker of Example 3. It is a sectional side view of the vacuum circuit breaker of Example 3. It is a sectional side view of the vacuum circuit breaker of Example 4. It is a front view for one phase of the vacuum circuit breaker of Example 4. It is a top view for one phase of the vacuum circuit breaker of Example 4.

  The vacuum circuit breaker of the present invention will be described below based on the illustrated embodiment. In addition, the following is an Example suitable for implementation of this invention to the last, and is not the meaning which intends limiting the application object of this invention.

  1 to 3 show Embodiment 1 of the vacuum circuit breaker according to the present invention. 1 is a side sectional view of the vacuum circuit breaker according to the first embodiment, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a sectional view taken along the line BB in FIG.

  As shown in FIGS. 1 to 3, the vacuum circuit breaker according to the present embodiment includes a main circuit switching unit 1 shown on the left side of FIG. 1, a drive mechanism unit 2 shown on the right side of FIG. 1, and a link mechanism shown on the lower side of FIG. The unit 3 is schematically configured. The main circuit opening / closing part 1 is covered with an insulating frame 7, and the drive mechanism part 2 and the link mechanism part 3 are respectively covered with a drive mechanism part case 4 and a link mechanism part case 5, which are metal cases of ground potential. ing. The insulating frame 7 of the main circuit opening / closing unit 1 is fixed to either the link mechanism unit case 5 or the drive mechanism unit case 4 or both. In FIG. 1, as an example, a configuration in which the main circuit opening / closing portion 1 is fixed to the link mechanism portion case 5 is shown. In FIG. 1, a one-phase circuit breaker is illustrated as a vacuum circuit breaker. However, a three-phase circuit breaker may be used, and in this case, the main circuit switching unit 1 for three phases is arranged in the depth direction of FIG. 1. It becomes the structure arranged side by side. Moreover, since the drive mechanism part 2 and the link mechanism part 3 should just use a well-known thing, detailed description, such as those internal structures, is abbreviate | omitted below.

  The main circuit opening / closing part 1 includes a vacuum valve 6 having a pair of contactable and separable contacts, and each conductive plate connected to the fixed side and the movable side of the vacuum valve 6 (movable side conductive plate 16 and fixed side conductive plate 17). And an insulating frame 7 that electrically insulates them from the drive mechanism section 2 and the link mechanism section 3, an insulating rod 9 that moves the movable side of the vacuum valve 6 in the vertical direction, and contact loads on the contacts in the vacuum valve 6. It is comprised by the wiping mechanism 8, such as a spring which adds.

On the upper side of the vacuum valve 6, a fixed side end plate 10 joined to the upper end of the cylindrical insulating material 12 and a fixed side conductor 15 penetrating the fixed side end plate 10 in an airtight manner are fastened by bolts 17c. Also, on the lower side of the vacuum valve 6, a movable side end plate 11 joined to the lower end of the cylindrical insulating material 12, and one end joined to the movable side end plate 11, and a bellows-shaped bellows permitting driving of the movable part. 13 and a movable-side conductor 14 that passes through the bellows 13 in an airtight manner and is driven in the axial direction while maintaining a vacuum. The internal pressure of the vacuum container configured as described above is maintained at a vacuum of about 10 ⁻² Pa or less.

  Inside the vacuum vessel, a fixed side contact connected to the end of the fixed side conductor 15 and a movable side contact connected to the end of the movable side conductor 14 are arranged. The movable side conductor 14 is connected to the drive mechanism unit 2 via the link mechanism unit 3 by connecting the insulating rod 9 to the end portion to which the movable side contact is not connected and the wipe mechanism 8 for applying a contact load to the contact pair. The axial drive of the valve 6 is possible. Thereby, the fixed side contact and the movable side contact of the vacuum valve 6 are switched, that is, the open state and the closed state of the vacuum circuit breaker are switched.

  The movable conductor 14 of the vacuum valve 6 is connected to a flexible flexible conductor 18, and the flexible conductor 18 is connected to the movable conductor plate 16. Since the flexible conductor 18 has flexibility, the electrical connection can be maintained even when the movable conductor 14 of the vacuum valve 6 operates in the axial direction.

  The insulating frame 7 fixed to the link mechanism case 5 has a fixed conductor plate 17 fixed to the upper part thereof, and the fixed conductor plate 17 is connected to the fixed conductor 15 of the vacuum valve 6.

  As is apparent from FIG. 1, in this embodiment, the fixed-side conductor plate 17 serving as the power application portion has one end at the left side of the vacuum valve 6 in FIG. 1 (the side opposite to the drive mechanism portion 2 side) and a bolt 17a. The bolt 17 is bolted to the insulating frame 7 by a nut 17b, and the other end is bolted to the vacuum valve 6 by a bolt 17c. That is, the fixed-side conductor plate 17 has a cantilever structure in which the fixed end is located on the opposite side of the drive mechanism portion 2 and supports the vacuum valve 6 in a cantilever manner.

  In this way, in the vacuum circuit breaker of this embodiment in which the fixed-side conductor plate 17 is fixed to the insulating frame 7 on the opposite side of the drive mechanism portion 2, the fixed-side conductor plate 17 is fixed to the insulating frame 7 on the drive mechanism portion 2 side. Compared to the structure described above, as shown in FIG. 1, there are two gaps (gap 22a, In addition to being able to increase to 22b), as shown in FIG. 1 and FIG. 3, the distance between the bolt 17a, which is the electric power application part outside the insulating frame 7, and the drive mechanism part case 4 can be made longer. That is, according to the configuration of the present embodiment, the number of gaps between the power application unit in the insulating frame 7 and the installation potential is increased, and the distance between the power application unit outside the insulation frame 7 and the ground potential is increased. Insulation performance can be improved.

  As a result, unlike Patent Document 1, it is not necessary to extend the height of the insulating frame 7 above the fixed-side conductor plate 17 in order to secure a predetermined insulating distance, and the height of the insulating frame 7 is set to the fixed-side conductor. The position can be reduced to the position where the plate 17 is fixed, and the vacuum circuit breaker can be downsized, and further the downsized power receiving panel for housing it can be realized.

  As shown in FIG. 1, in the present embodiment, the fastening portion with the fixed-side conductor 15 is positioned below the fastening portion with the insulating frame 7 by bending the fixed-side conductor plate 17 at a plurality of locations. I tried to do it. Thereby, since the gap between 17c which is a power application part and the insulation frame 7 can be enlarged, insulation performance can be improved. Further, the vacuum valve 6 was disposed at a height lower than the height of the drive mechanism case 4. As described above, by arranging the ground potential at any position on the side of the vacuum valve 6, an effect of stabilizing the electric field distribution of the vacuum valve 6 can be obtained.

  4 to 6 show a second embodiment of the present invention. 4 is a side sectional view of the vacuum circuit breaker of Example 2, FIG. 5 is a sectional view taken along the line AA in FIG. 4, and FIG. 6 is a sectional view taken along the line BB in FIG. A description of the same parts as those in the first embodiment will be omitted.

  In the vacuum circuit breaker of the present embodiment, as shown in FIG. 4, a protruding portion 19 is provided on the lower surface of the upper plate of the insulating frame 7 on the side opposite to the drive mechanism portion 2. As shown in FIG. 5, the protruding portion 19 is disposed so as to define the position with the fixed-side conductor plate 17 interposed therebetween.

  The vacuum circuit breaker of this embodiment provided with the protrusions 19 can not only obtain the same effects as in the first embodiment, but also the protrusions 19 serve as guides for mounting the fixed-side conductor plate 17, so that the fixed side The positioning of the conductor plate 17 is facilitated and the rotation of the fixed conductor plate 17 in the tightening direction when the bolt 17a is bolted to the insulating frame 7 can be prevented. It is also possible to obtain an effect of improving the work efficiency that can be shortened.

  Here, as an example, the example in which the protrusions 19 are provided on both sides of the fixed-side conductor plate 17 is shown, but the protrusion 19 may be provided on one side of the fixed-side conductor plate 17. Here, an example in which the protruding portion 19 separate from the insulating frame 7 is disposed by bonding or the like is shown, but a configuration in which both are integrally formed may be employed.

  As a modification of the second embodiment, FIG. 7 to FIG. 8 show a third embodiment of the present invention. In the second embodiment, the fixed-side conductor plate 17 is bolted to the upper plate of the insulating frame 7 on the side opposite to the drive mechanism portion 2, but in this embodiment, the fixed-side conductor plate 17 is extended as shown in FIG. The insulating frame 7 is brought into contact with the lower surface of the upper plate by being bent at a plurality of positions. Since other configurations are the same as those of the second embodiment, detailed description thereof is omitted.

  As is well known, when the vacuum valve 6 is changed from the open state to the closed state, the drive mechanism unit 2 and the link mechanism unit 3 act so as to lift the insulating rod 9 upward from below, so that the movable member interlocks with the insulating rod 9. The movable side contact of the side conductor 14 collides with the fixed side contact of the fixed side conductor 15, and both the conductors are electrically connected. The impact when the two contacts collide is transmitted to the fixed-side conductor plate 17 via the fixed-side conductor 15, but in the configuration of the present embodiment, the fixed-side conductor plate on both the drive mechanism unit 2 side and the opposite side thereof. 17 and the insulating frame 7 are in contact with each other, and the impact at the time of contact collision is shared by each and transmitted to the insulating frame 7, so that problems such as deformation of the fixed-side conductor plate 17 can be avoided.

  Further, when the fixed-side conductor plate 17 of the present embodiment in contact with the insulating frame 7 is used also on the drive mechanism portion 2 side, instead of the projecting portion 19 (or in addition to the projecting portion 19), insulation is performed as shown in FIG. It is good also as a structure which prescribes | regulates a position by pinching the stationary-side conductor board 17 with the protrusion part 20 provided in the drive mechanism part 2 side upper surface of the flame | frame 7 side. Also with this configuration, the effect of improving work efficiency can be obtained as in the second embodiment.

  The protruding portion 20 may be arranged between the fixed side conductor plate 17 and the insulating frame 7. In this case, since the protruding portion 20 also acts as a buffer portion, it can withstand a greater impact than the configuration of FIG.

  9 to 11 show a fourth embodiment of the present invention. 9 shows a side sectional view of the vacuum circuit breaker of Example 4, FIG. 10 shows an AA sectional arrow view of FIG. 9, and FIG. 11 shows an BB sectional arrow view of FIG. A description of the same parts as those in the above-described embodiment will be omitted.

  As shown in FIG. 9, in the vacuum circuit breaker of the present embodiment, the upper surface of the upper side of the insulating frame 7 opposite to the drive mechanism unit 2 has a predetermined thickness at a position closer to the drive mechanism unit 2 than the bolt 17a. A protruding portion 21 having a thickness is provided. As shown in FIGS. 10 and 11, the protruding portion 21 is arranged over the entire width so as to extend in the width direction of the insulating frame 7.

  The vacuum circuit breaker of the present embodiment provided with the protrusions 21 can not only obtain the same effects as in the first embodiment, but also the protrusions 21 serve as reinforcing members for the insulating frame 7, so that the machine of the insulating frame 7 The mechanical strength can be increased, and the insulating frame 7 can be prevented from being damaged by an impact at the time of contact collision when the vacuum valve 6 is changed from the open state to the closed state.

  In addition, although the fixed side conductor plate 17 of FIGS. 9-11 has illustrated the thing of the structure fastened with a volt | bolt to the upper surface of the insulation frame 7 on the opposite side to the drive mechanism part 2, it is fixed like Example 3. You may use combining the insulating frame 7 of the shape which extended | stretched the side conductor board 17, and was made to contact the upper surface of the insulating frame 7 by the side of the drive mechanism part 2, and the protrusion part 21 shown in FIGS.

1 ... main circuit switching part,
2 ... Drive mechanism,
3 ... Link mechanism part,
3a ... Lever 4 ... Drive mechanism case,
5 ... Link mechanism part case,
6 ... Vacuum valve,
7 ... Insulating frame,
8 ... Wipe mechanism,
9 ... Insulating rod,
10: Fixed end plate,
11 ... movable side end plate,
12 ... Cylinder insulation,
13 ... Bellows,
14 ... movable side conductor,
15: Fixed side conductor,
16 ... movable side conductor plate,
17: Fixed side conductor plate,
16a, 17a, 17c ... bolts,
16b, 17b ... nuts,
18 ... Flexible conductor,
19, 20, 21 ... projecting portions 22a, 22b ... gaps

Claims (5)

A vacuum valve that is energized when the fixed side contact and the movable side contact inside are brought into contact;
A fixed-side conductor plate electrically connected to the fixed-side contact;
An insulating frame covering the vacuum valve;
A drive mechanism unit that is adjacent to the insulating frame and drives the movable contact;
In the vacuum circuit breaker which is a cantilever structure fixed to the insulating frame on the opposite side of the drive mechanism portion, the fixed side conductor plate ,
The vacuum circuit breaker, wherein the fixed-side conductor plate is bent at a plurality of locations such that a connection portion with the fixed-side contact is positioned below a fixed portion with the insulating frame. A vacuum valve that is energized when the fixed-side contact and the movable-side contact inside are brought into contact;
A fixed-side conductor plate electrically connected to the fixed-side contact;
An insulating frame covering the vacuum valve;
A drive mechanism unit that is adjacent to the insulating frame and drives the movable contact;
In the vacuum circuit breaker which is a cantilever structure fixed to the insulating frame on the opposite side of the drive mechanism portion, the fixed side conductor plate ,
A vacuum circuit breaker characterized in that a first projecting portion for defining the position of the fixed-side conductor plate is provided on the lower surface of the upper plate opposite to the drive mechanism portion of the insulating frame. A vacuum valve that is energized when the fixed-side contact and the movable-side contact inside are brought into contact;
A fixed-side conductor plate electrically connected to the fixed-side contact;
An insulating frame covering the vacuum valve;
A drive mechanism unit that is adjacent to the insulating frame and drives the movable contact;
In the vacuum circuit breaker which is a cantilever structure fixed to the insulating frame on the opposite side of the drive mechanism portion, the fixed side conductor plate ,
The vacuum circuit breaker characterized in that the fixed-side conductor plate is in contact with the lower surface of the upper plate on the drive mechanism side of the insulating frame. The vacuum circuit breaker according to claim 3 ,
A vacuum circuit breaker characterized in that a second protrusion for defining the position of the fixed-side conductor plate is provided on the lower surface of the upper plate of the insulating frame on the drive mechanism portion side. A vacuum valve that is energized when the fixed-side contact and the movable-side contact inside are brought into contact;
A fixed-side conductor plate electrically connected to the fixed-side contact;
An insulating frame covering the vacuum valve;
A drive mechanism unit that is adjacent to the insulating frame and drives the movable contact;
In the vacuum circuit breaker which is a cantilever structure fixed to the insulating frame on the opposite side of the drive mechanism portion, the fixed side conductor plate ,
A third protrusion that extends in the width direction is provided on the upper plate upper surface of the insulating frame on the opposite side of the drive mechanism portion, closer to the drive mechanism portion than the fixed position of the fixed conductor plate. A vacuum circuit breaker.

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