KR100611597B1 - Circuit breaker and support insulator - Google Patents

Abstract

The present invention provides a switchgear using a support insulator, which is compact and inexpensive, and a support insulator.

According to the present invention, the trolley 2, the conductors 21 and 22 connected to both ends of the switch body 7 and the conductors 21 and 22 are insulated from and supported on the trolley 2. In the switchgear provided with the insulating support part 30, the insulating support part 30 connects the through hole 31b formed in the vicinity of the mounting surface formed in the both ends, and the mounting hole which passes through the through hole 31b from the mounting surface, respectively. The branch has a support insulator 3l, a press plate 32 disposed inside the through hole 31b, and a bolt 33 for fastening the press plate 32 to be mounted from both sides of the support insulator 31. The conductors 21 and 22 are supported and fixed to the trolley | bogie 2 by fastening the crimping plate 32 with the bolt 33 inserted in the hole.

Insulator, pressing plate, conductor, bogie, insulation support, mounting hole, through hole, bogie, switchgear

Description

Switchgear and support insulator {CIRCUIT BREAKER AND SUPPORT INSULATOR}

1 is a side view showing an opening and closing device according to a first embodiment of the present invention.

2 is a cross-sectional view showing an insulating support of the switching device according to the first embodiment of the present invention.

3 is a plan view of FIG. 2 viewed from the arrow III direction.

FIG. 4 is a side view of FIG. 2 viewed from arrow IV direction. FIG.

5 is a view showing an example of a crimping plate used in the insulating support of the switching device according to the first embodiment of the present invention.

6 is a view showing another example of the pressing plate used in the insulating support of the switching device according to the first embodiment of the present invention.

7 is a view showing another example of the pressing plate used in the insulating support of the switching device according to the first embodiment of the present invention.

8 is a plan view showing another example of the insulating support of the switching device according to the first embodiment of the present invention.

9 is a view showing a mounting portion of a conventional conductor support insulator.

* Explanation of symbols in the drawings

2: balance 3: operating mechanism

7: Actuator body (vacuum valve)

21, 22: conductor 30: insulation support

31: support insulator 31a: mounting surface

31b: through hole 31d: mounting hole

31e: protrusion 31f: recess

32: crimp plate 32a: screw hole

33: bolt 36: plate

36a: bolt hole 37: nut

38: Plate 38a: Rivet Hole

39: rivet 40: support insulator

40b: through hole 41: pressing plate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support insulator for use in an electric switchgear, such as an electric power switchgear applied to a water distribution facility, and the like.

In the case of the high voltage circuit breaker using a vacuum valve, the switchgear is comprised insulated and supported by the conductor etc. which the conductor derived from both of the vacuum valve which has a fixed electrode and a movable electrode. Since the support insulator used for this insulation support part is usually an insulated resin material or a magnetic material, in order to ensure the fastening strength of the screw part for attaching a support object, for example, the metal embedded with screw hole processing Is molded integrally with the insulating resin material and molded. In such a structure, the interface between the mold insulating resin and the buried metal may be peeled off due to heat shrinkage or the like during use, resulting in a gap. If a gap is generated, corona is generated, leading to dielectric breakdown from partial discharge, and there is a problem in that insulation performance cannot be maintained. On the other hand, the conductor support insulator of the structure which does not use a buried metal was proposed. 9 is a partial view of such a conductor support insulator. As shown in the figure, the fixing portion for attaching the conductor supporting insulator 51 to the support member on the opposite side is a U-shaped slit portion 51b on a flange 51a integrally formed of an insulating resin material. Is formed. It is fixed by inserting a fastening bolt into the slit part 51b and fastening it with a support member. [Japanese Laid-Open Patent Publication No. 2000-322961 (see page 2, Figs. 1 and 2)]

Since the switchgear is comprised as mentioned above, when the support insulator which does not use a buried metal as shown in Unexamined-Japanese-Patent No. 2000-322961 is used for an insulation support part, the peeling of the interface of a mold insulation resin and a buried metal will be carried out. The problem is solved. However, in this structure, since the fastening bolt is exposed to the outside, the electric field is concentrated in the portion, it is necessary to ensure a corresponding insulation distance. That is, there is a problem that the length of the support insulator becomes longer than in the case of using a buried metal. For this reason, it was not suitable for use for switching devices, such as a power distribution, which strongly require compactness.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an opening and closing device having a support insulator, and a support insulator, which can realize a compact and low cost.

The switchgear according to the present invention is a switchgear provided with a trolley for accommodating an operation mechanism for opening and closing the switch body, a conductor connected to both ends of the switch body, and an insulating support portion for insulating and supporting each of the conductors to the trolley. The insulating support portion includes a support insulator having a through hole formed in the vicinity of the mounting surface formed at both ends and a mounting hole passing from the mounting surface to the through hole, a pressing plate disposed inside the through hole, and a fastening plate for fastening the pressing plate. The pressing plate is fastened by the fastening member inserted into the mounting hole from both sides of the support insulator inserted between the bogie and the conductor, so that the conductor is supported and fixed to the bogie.

Moreover, the support insulator which concerns on this invention has the mounting surface which mounts a support member in both ends in the support insulator which insulates and supports two support members which are at least one charging part at predetermined intervals, Through-holes are provided in the vicinity to install the press plates, and mounting holes for fastening the press plates from both mounting surfaces side penetrate from the mounting surfaces to the through holes.

First embodiment

1 is a side view showing an opening and closing device according to a first embodiment of the present invention, partially broken to show the inside. The opening and closing apparatus of this embodiment will be described taking an example of a circuit breaker using a vacuum valve in the main body of the switch.

As shown in the figure, the trolley | bogie 2 covered by the frame 1 has the operation mechanism 3 which opens and closes a circuit breaker. The output from the operating mechanism 3 is transmitted to the insulating operating rod 6 via an output link 4 and a crossbar 5. The vacuum valve 7 which is the main body part of a circuit breaker has the fixed electrode 7a and the movable electrode 7b. The upper fixing plate 8, the upper terminal 9, and the main circuit conductor 10 are connected to the fixed electrode 7a side. The upper fixing plate 8, the upper terminal 9, and the main circuit conductor 10 constitute a conductor 21 connected to the fixed electrode 7a. At the end of the main circuit conductor 10, a contactor 11 for connecting to the conductor subsequent thereto is provided.

On the other hand, the movable electrode 7b side of the vacuum valve 7 is connected to the lower terminal 14 through the flexible conductor 13 connected and supported by the split terminal 12, and the main circuit conductor to the lower terminal 14. (15) is connected. The conductor 22 connected to the movable electrode 7b by the split terminal 12, the flexible conductor 13, the lower terminal 14, and the main circuit conductor 15 is constituted. The contact 16 is provided in the front-end | tip of the main circuit conductor 15 similarly to the upper part. The insulating operation rod 6 is connected to the movable electrode 7b, and with the output of the operation mechanism 3, the movable electrode 7b is driven, and the movable electrode 7b and the fixed electrode 7a are contacted and separated. do. An insulation support 17 is interposed between the conductors 2l and 22 to support them.

The conductor 21 connected to the fixed electrode 7a is provided by a support insulator 31, a pressing plate 32, a bolt 33 as a fastening member, and an insulating support portion 30 made of a metal plate and a spring metal plate. It is fixed to 2). Similarly, the conductor 22 connected to the movable electrode 7b is also fixed to the cart 2 by the insulating support part 30. The structure of the insulating support part 30 and the mounting method to the trolley | bogie 2 and the conductors 21 and 22 are demonstrated in detail below.

First, the insulation support part 30 is demonstrated. 2 to 4 are views showing the insulating support part 30, FIG. 2 is a cross-sectional view, FIG. 3 is a plan view seen from the arrow III direction of FIG. 2, and FIG. 4 is a side view seen from the arrow IV direction of FIG.

The support insulator 31 has a substantially cylindrical shape, and end surfaces of both ends in the axial direction are parallel to each other to form a mounting surface 31a of the support member. In the vicinity of each mounting surface 31a, a through hole 31b having a surface parallel to the mounting surface 31a is formed. As shown in FIG. 3, the through-hole 31b is formed perpendicularly to the axial direction of the support insulator 31, the cross section seen from the plane is substantially rectangular, and the surface 31c facing the mounting surface 31a. It is formed in parallel with this mounting surface 31a. In the inner surface of the through hole 31b, the side facing the surface 31c forms a slight subtraction gradient during molding. The mounting surface 31a is provided with a mounting hole 31d through the through hole 31b.

The support insulator 31 is made of an epoxy resin, a bulk molding compound (BMC), a ceramic, or the like, and is produced by a mold or the like.

The pressing plate 32 is inserted and disposed inside the through hole 31b. 5 is a view showing an example of the pressing plate. Fig. 5A is a front view and Fig. 5B is a sectional side view seen from the arrow direction of Fig. 5A. As shown in the figure, the pressing plate 32 is made of a plate-shaped member, and a screw hole 32a corresponding to the mounting hole 31d of the support insulator 31 is processed. The outer shape is the size which does not protrude from the through hole 31b of the support insulator 31, and the plate thickness is about the thickness of the nut corresponding to the size of a screw hole. In addition, the material is preferably a metal such as iron or aluminum in terms of strength.

The insulating support part 30 is comprised by the said support insulator 31, the crimping plate 32, the bolt 33 which is a fastening member, the metal plate 34, and the spring metal plate 35. As shown in FIG.

Next, the mounting method of the insulating support part 30 is demonstrated. As shown in FIG. 2, the support insulator 31 is inserted between the bogie 2, the upper fixing plate 8 of the conductor 21, and the lower terminal 14 of the conductor 22, and the mounting surface 31a is inserted. In combination with the mounting surface on the mating side, the bolt 33 is inserted into the mounting hole 31d through the metal plate 34 and the spring metal plate 35 from both sides of the support insulator 31, thereby screwing the screw hole of the crimp plate 32. Screw on (32a). In this state, the crimping plate 32 is fastened by fastening the bolts 33, and the trolley 2, the upper fixing plate 8, and the lower terminal 14 are firmly supported and fixed.

Next, the operation will be described. Since the support insulator basically insulates and supports live parts, such as a conductor, at least one of a support member is a live part normally. In the case of this embodiment, the upper fixing plate 8 and the lower terminal 14 are charging portions. If the metal part is exposed near the live parts, the electric field is concentrated. In the support insulator 31 according to the present embodiment, since the pressing plate 32 is accommodated in the through hole 31b formed in the support insulator 31, there is no metal part exposed to the outside, so that the electric field is concentrated. In addition, the surface insulation distance from the charging part side to the ground side can also be sufficiently secured.

In the above description, what constituted the press plate of the insulating support part 30 from one sheet member is described. Next, other press plates will be described. 6 is a view showing another example of the pressing plate. Fig. 6 (a) shows a plan view, and Fig. 6 (b) shows a side sectional view seen from the arrow direction in Fig. 6 (a). As shown in the figure, the nut 37 is centered on the thin plate member 36 having the bolt hole 36a corresponding to the mounting hole 31d of the support insulator 31. Is fixed by welding or adhesion. As for the material of the board | plate material 36, the steel plate which is excellent also in intensity | strength with the easy to weld nut 37 is preferable.

Similarly to the case where the crimping plate 32 is used by fastening the crimping plate having such a configuration by the bolt 33 serving as the fastening member via the metal plate 34 and the spring metal plate 35 in the same manner as in FIG. 2. It can exert the effect of.

Moreover, the other example of a crimping plate is shown in FIG. Fig. 7A shows a partial cross-sectional view of a mounted state, and Fig. 7B shows a rivet that is a fastening member. In the drawing, the crimping plate disposed inside the through hole 31b is a thin plate 38 having substantially the same shape as the plate 36 of FIG. 6, and the mounting hole 31d of the support insulator 31. Correspondingly, the rivet hole 38a is formed. As shown in Fig. 7 (b), the rivet 39 uses a type of blind rivet that can be caulked only by work from one side. It consists of the shaft 39a, the flange 39b, and the sleeve 39c.

Next, the mounting method will be described. First, the support insulator 31 is inserted between the bogie 2 and the upper fixing plate 8 or the lower terminal 14 to assemble the mounting holes with each other, and then the shaft of the rivet 39 using a dedicated tool. The part 39a is gripped and inserted into the mounting hole 31d and the rivet hole 38a from both sides of the support insulator 31, and the flange 39b is brought into contact with the surface of the mounting part. Next, the tool is operated to introduce the shaft 39a into the tool, and the tip of the sleeve 39c is deformed. In addition, when the shaft 39a is pulled in, the shaft 39a is cut to a state as shown in Fig. 7A, and the mating support member and the support insulator 31 are firmly fastened.

In the mounting work of the support insulator 31 as described above, the mounting surface 31a of the support insulator 31, the trolley 2 which is the support member on the opposite side, the upper fixing plate 8, and the lower terminal 14 side The structure which makes alignment easy at the time of combining the mounting surface of this is demonstrated. As shown in FIG. 2, the projection part 31e is formed in the mounting surface 31a of the conductor side of the support insulator 31, and is shown in the corresponding position of the upper fixing plate 8 (or lower terminal 14). As shown in Fig. 4, the locking holes 8a (or 14a) are formed. On the other hand, the recessed part 31f is formed in the mounting surface 31a of the trolley | bogie 2 side, and the protrusion part is formed in the corresponding position on the trolley | bogie 2 side.

With such a configuration, the mating portion is engaged with the mating portion at the protrusion or the recess, and the relative movement between the support insulator 31 and the mating support member is prevented and positioned. In addition, both mounting surfaces 31a may be protrusions, and both may be only recesses.

Next, another example of the support insulator will be described. 8 shows another example of the support insulator. Parts equivalent to those in Figs. 2 to 4 are denoted by the same reference numerals and description thereof is omitted. The difference is the shape of the through hole. Although the cross section seen from the plane of the through hole 31b of the support insulator 31 shown to FIGS. 2-4 is a substantially rectangular shape with the surface 31c parallel to the mounting surface 31a, the support insulator shown in FIG. 8 ( The through hole 40b of the 40 has the surface 40c facing the mounting surface 40a as an arc-shaped curved surface. One surface of the crimping plate 41 disposed therein is also a curved surface aligned with the opposing surface 40c. Moreover, it is good also as an inclined surface shape (shape like the two inclined surfaces of an isosceles triangle) which pointed the center part instead of an arc shape.

Using a support insulator having such a through hole and a pressing plate corresponding thereto makes positioning of the pressing plate easy during assembly.

In addition, in the above description, although the case of the circuit breaker which used the vacuum valve for the switch body as a switchgear was demonstrated, it is not limited to this.

Moreover, the support insulator used for the insulation support part demonstrated above can be widely applied as a support insulator which insulates and supports two support members which are at least one charging part at predetermined intervals besides a switching device.

As described above, according to the switchgear according to the present embodiment, in the switchgear configured with a bogie, a conductor connected to both ends of the switch body, and an insulation support for insulating and supporting each of the conductors on the bogie, the insulation support is provided at both ends. A support insulator having a through hole formed in the vicinity of the mounting surface formed on the mounting surface, and a mounting hole passing from the mounting surface to the through hole, a pressing plate disposed inside the through hole, and a fastening member for fastening the pressing plate, Since the pressing plate was fastened by the fastening member inserted in the mounting hole from both sides of the support insulator inserted between the trolley | bogie and the conductor, and the conductor was supported and fixed to the trolley | bogie, the support insulator which fixes the conductor part of an opening-and-closing apparatus is attached to a mounting part. As we made structure not to need buried metal requiring high casting technique, we can manufacture at low cost, and support insulator side is support insulator Since there is no metal member exposed to the outside from the external shape of the structure, since the electric field is not concentrated, it can be made compact. Therefore, cost reduction and compactness of the whole switchgear can be realized.

Moreover, since the crimping board arrange | positioned at the through-hole of the support insulator of an insulating support part is comprised from the board member which has a screw hole corresponding to the mounting hole of a support insulator, and it is made to fasten with a bolt, manufacture of a crimping board becomes simple.

Moreover, since a crimping board was comprised by fixing a bolt to a thin board | plate material, and it is made to fasten by bolt fastening, the weight of a crimping board can be reduced and weight of an insulating support part can be reduced.

In addition, since the pressing plate is fastened with a thin plate and rivets, looseness does not occur due to vibration or the like, and a reliable switching device can be provided.

Moreover, since the protrusion part or the recessed part which engages with a support member is formed in the mounting surface of a support insulator, the relative movement between a support insulator and the support member of an opponent side is prevented, and the workability at the time of attachment is improved.

Further, according to the support insulator of the present embodiment, the support insulator which insulates and supports two support members at least one of which are charging parts at a predetermined interval, has mounting surfaces for mounting the support members at both ends, and is in the vicinity of each mounting surface. The through-hole yoke for mounting the compression plate was formed in the mounting hole, and mounting holes for fastening the compression plate from both mounting surface sides were formed by penetrating from the mounting surface into the through hole. Since it is a simple structure which is not required, manufacturing cost can be reduced and a compact support insulator can be provided at low cost.

It can be widely applied to a power switchgear applied to a water distribution facility and the like, and a support insulator supporting and fixing a charging unit such as a main circuit conductor of a high voltage device.

According to the switchgear of this invention, the insulated support part which insulates and supports the conductor connected to the both ends of a switch body to a trolley | bogie is a support insulator which has the through-hole formed in the vicinity of the mounting surface of both ends, and the mounting hole formed in the mounting surface, A pressing plate disposed inside the hole and a fastening member, and inserting the fastening member into the mounting hole from both sides of the support insulator inserted between the bogie and the conductor to fasten the pressing plate so that the conductor can be fixed to the bogie. Since the support insulator for fixing the conductor part of the switchgear can be manufactured at low cost because it does not require a buried metal requiring high molding technology in the mounting part, the electric field is not concentrated because there is no metal exposed part on the support insulator side. This makes it compact. Therefore, cost reduction and compactness of the whole switchgear can be aimed at.

Moreover, according to the support insulator of this invention, it has a mounting surface which mounts a support member at both ends, the through-hole for installing a crimping plate is formed in the vicinity of each mounting surface, and the mounting hole for fastening a crimping plate is Since it is formed penetrating from the mounting surface to the through-hole, it has a simple structure which does not require a buried metal requiring high casting technology in the mounting portion of the support insulator, thereby reducing the manufacturing cost.

Claims (4)

In the switchgear provided with the trolley which accommodates the operation mechanism which opens and closes a switch body, the conductor connected to the both ends of the said switch body, and the insulation support part which insulates each of the said conductors to the said trolley | bogie, The said insulating support part is a support insulator which has through-holes formed in the vicinity of the mounting surface formed in the both ends, and the mounting hole which passes from the said mounting surface to the said through-hole, the crimping board arrange | positioned inside the said through-hole, and the said crimping board And a clamping member for fastening the clamping plate, and the pressing plate is fastened by the fastening member inserted into the mounting hole from both sides of the support insulator inserted between the cart and the conductor so that the conductor is supported and fixed to the cart. Opening and closing device characterized in that. The method of claim 1, The crimping plate is a plate having a screw hole corresponding to the mounting hole, and the fastening member is characterized by using a bolt. The method of claim 1, The pressing plate is configured by fixing a nut to a plate member having a bolt hole corresponding to the mounting hole in accordance with the bolt hole, and using a bolt as the fastening member. delete

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