JP2008228568A - Gas insulated switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas insulated switch for simplifying and facilitating an assembling work, and improving the flexibility in design. <P>SOLUTION: One of flanges 11, 12 disposed in first and second tank so as to face each other has a plurality of insertion holes 11b penetrated in a position different from a position of a plurality of fastening members 4 provided in the circumferential direction of the flanges to fasten the flanges through an insulating spacer 3. The insulating spacer has a plurality of engagement holes 33a provided in a position corresponding to the insertion holes. Insulating spacer fixing members 45 are inserted into the insertion holes in one flange and is engaged with the engagement holes in the insulating spacer to fix the insulating spacer to one tank by using the insertion holes provided in the outer flange section of the flange independent of the fastening members. The number of insulating spacer fixing members 45 is smaller than the number of the fastening members. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gas-insulated switchgear used for power transmission / distribution and power distribution.

  7 is a cross-sectional view showing a tank connecting portion through an insulating spacer of a conventional gas-insulated switchgear, and FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7 corresponds to a cross-sectional view taken along the line VII-VII in FIG. In the figure, 1 is a cylindrical first tank provided with a flange 11 at one end connection portion, 2 is a cylindrical second tank provided with a flange 21 at one end connection portion, and 3 is opposed. In this example, it is a disc-shaped insulating spacer interposed between the flanges 11 and 21.

  Reference numeral 31 denotes an outer peripheral portion of the insulating spacer 3 at a substantially equal angle in the circumferential direction, and in this example, six through holes are provided. The embedded metal having the provided screw holes 32 a, 11 a and 21 a are through holes provided at positions corresponding to the through holes 31 and the screw holes 32 a of the insulating spacer 3. 4 is a fastening member that fastens the flanges 11 and 21 through the insulating spacer 3. The through hole 11 a, the through hole 31 or the screw hole 32 a, and the screw rod 41 that sequentially passes through the through hole 21 a, the washer 42, and the nut 43. It is made up of.

5 is a central conductor embedded through the central portion of the insulating spacer 3 in the axial direction, 61 and 62 are conductors supported and fixed to the central conductor 5 by using fastening members such as bolts (not shown), for example. It is. The first and second tanks 1 and 2 are filled with an insulating medium such as SF ₆ (sulfur hexafluoride) gas, and the insulating spacer 3 forms a gas compartment inside the fastened tank. The conductors 61 and 62 are insulated and supported from the ground potential.

  In assembling the gas insulated switchgear, from the viewpoint of workability and safety, it is necessary that the insulating spacer 3 is first joined and fixed to one tank, and then the other tank is joined. In this case, the order of the tanks to be attached may be determined by the convenience of the configuration of the conductors 61 and 62.

  Therefore, when the tanks 1 and 2 are directly joined to both sides of the insulating spacer 3 as shown in FIG. 7, the insulating spacer 3 can be attached so that the insulating spacer 3 can be fixed to one tank. A screw hole 32a is formed, and it is necessary to use a screw rod 41 for fastening. Accordingly, as shown in the figure, the insulating spacer 3 has a through hole 31 dedicated for fastening between the flanges 11 and 21 and a screw hole 32a for attaching the insulating spacer 3 to one tank during assembly along the circumferential direction. Alternatingly arranged.

  The total number of the through holes 31 and the screw holes 32a is necessary to withstand the differential pressure when the screw rod 41 and the nut 43 attached to the through holes 31 and the nut 43 have a difference in the pressure of the insulating gas sealed in the tanks 1 and 2. It is set to be more than a certain number. It should be noted that the through holes 31 and the screw holes 32a do not necessarily have to be alternate, the balance of the load applied to the screw rod 41 by the internal pressure does not affect the strength, and is inconvenient for the tightening operation of the screw rod 41 and the nut 43. It is also allowed to shift the arrangement within a range where no occurrence occurs.

  In the screw hole 32a, it is necessary to withstand the differential pressure when the thread portion of the screw has a difference in the pressure of the insulating gas sealed in the tanks 1 and 2, but the material constituting the insulating spacer 3 has strength. Since it is weak, it is usually configured by embedding a metal filling 32 provided with a screw hole 32 a in the insulating spacer 3.

JP 2000-50438 A

  Since the conventional gas-insulated switchgear is configured as described above, for example, one of the tank 1 and the tank 2 is a tank having an outer flange shape, and the other has a so-called inner screw hole having a bottomed screw hole. When a tank composed of a flange shape and the insulating spacer 3 is composed of an outer flange shape for the convenience of the construction of the conductors 61 and 62 must be constructed first, the joining itself becomes impossible. There was a point.

  For example, in Patent Document 1, in a tank connection part of a gas insulated switchgear in which an insulating spacer is interposed between an outer flange and an inner flange, two types of play having different sizes for the M20 and M16 are provided on the outer flange. A hole is provided, and an insulating spacer is provided with a screw hole of M20 and a play hole of M16, and the insulating spacer is fixed to an arbitrary flange.

  However, since the holes for fastening the flanges are also used as holes for temporarily stopping the insulating spacers on one flange, the bolts for fastening the flanges and the diameter and length for fixing the insulating spacers. In addition to preparing bolts with different heights and head shapes, it is necessary to remove the bolts that have already been attached and re-select the target bolts for both assembly and removal. There is a problem that becomes complicated.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a gas insulated switchgear that is easy and easy to assemble and has improved design freedom.

  The gas-insulated switchgear according to the present invention includes a first tank and a second tank that are disposed with flanges provided at respective connecting portions facing each other, and the first tank and the second tank. A plurality of insulating spacers interposed between opposing flanges and partitioning the inside of the tank from each other, at least one of which is provided at a predetermined interval in the circumferential direction of the flange having an outer flange portion, and sandwiching the insulating spacers between the flanges In the gas insulated switchgear including a fastening member to be fastened, a plurality of fastenings provided in the circumferential direction are provided on a flange having an outer flange portion provided in one of the first tank and the second tank. A plurality of insertion holes penetrating at positions different from the positions of the members, and the insulating spacer has a plurality of engagement holes provided at positions corresponding to the insertion holes, One tank using an insertion hole provided in the outer flange portion of the flange independently of the fastening member, and through the insertion hole of the other flange and engaging with the engagement hole of the insulation spacer. Insulating spacer fixing members fewer than the number of the fastening members to be fixed to are provided.

  The flanges of the first tank and the second tank are characterized in that one tank is an outer flange and the other tank is an inner flange.

  Further, the engagement hole provided in the insulating spacer is a screw hole directly screwed into the material of the insulating spacer.

  According to the present invention, the insulating spacer is fixed to one tank by using the insertion hole provided in the outer flange portion of the flange independently of the flange mutual fastening member, at least one of which has the outer flange portion. Since the insulating spacer fixing members are provided in a number smaller than the number of fastening members, it is possible to provide a gas insulated switchgear that is easy and easy to assemble and has improved design freedom.

Embodiment 1 FIG.
1 is a cross-sectional view showing a tank connecting portion through an insulating spacer of a gas-insulated switchgear according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 1 corresponds to a cross-sectional view taken along line II in FIG. In the figure, 2 is a second tank having a flange 22 consisting of an inner flange at one end, and 22 a is a bottomed screw hole provided in the flange 22.

  Reference numeral 3 denotes an insulating spacer. As shown in FIG. 2, a total of twelve through holes 31 are provided in the peripheral portion at substantially equal angles in the circumferential direction in this example, and in this example, the circumferential direction is separate from the through holes 31. Have a buried metal 33 having screw holes 33a which are engagement holes provided at four positions at substantially equal angles. The flange 11 of the first tank 1 has 12 through holes 11a corresponding to the through holes 31 of the insulating spacer 3 shown in FIG. 2 in the circumferential direction and insertion holes 11b corresponding to the screw holes 33a. Four locations are provided in the direction.

  Reference numeral 45 denotes a bolt as an insulating spacer fixing member. When the insulating spacer 3 is first joined to one first tank 1 during assembly, an insertion hole 11b provided in the washer 42 and the flange of the first tank 1 is provided. Is inserted into the screw hole 33 a of the insulating spacer 3 to attach the insulating spacer 3 to the first tank 1.

  Reference numeral 4 denotes a fastening member between adjacent tanks, which includes a headed bolt 44 and a washer 42. The bolt 44 is inserted through the washer 42, the through hole 11a provided in the flange of the first tank 1 and the through hole 31 provided in the insulating spacer 3 in order, and is screwed into the screw hole 22a of the second tank. The tanks 1 and 2 are fastened to each other at 12 points in the circumferential direction. Since other configurations are the same as those of the conventional apparatus, description thereof is omitted. Note that the same or corresponding parts are denoted by the same reference numerals throughout the drawings, and description thereof is omitted.

  The total number of the through holes 11a is more than the number necessary for withstanding the differential pressure when the bolts 44 attached thereto have a difference in the pressure of the insulating gas sealed in the tanks 1 and 2. Is set to Moreover, although the screw holes 33a are shown in the case where four screw holes 33a are equally arranged on the arrangement circumference as shown in FIG. 2, the screw holes 33a may be increased or decreased within a range not causing inconvenience in the joining work. It may not be evenly arranged as long as no inconvenience occurs in the joining operation.

  Further, as shown in FIGS. 1 and 2, the screw hole 33a provided in the insulating spacer 3 is screwed into the metal pad 33 provided in the insulating spacer 3, but the bolt 44 is a tank. Since there are more than the number required to withstand the differential pressure when there is a difference in the pressure of the insulating gas sealed in 1 and 2, the thread of the screw hole 33a for mounting the insulating spacer during assembly is different. It is not necessary to withstand the pressure, and the body of the insulating spacer 3 itself may be directly threaded.

  Since the first embodiment is configured as described above, the insulating spacer 3 must be joined to the first tank 1 first for the convenience of the connection conductors 61 and 62, and the second Even when the tank 2 is configured with an inner flange shape, the bolt 45 is inserted into the insertion hole 11b of the flange 11, and is screwed into the screw hole 33a of the insulating spacer 3 to be fastened. It can be easily attached to one tank 1. Further, the bolt 45 as the insulating spacer mounting member does not need to be removed when the second tank 2 and the conductor 62 are attached and then assembled, so that the assembly is easy.

  As a result, the degree of freedom in designing the gas insulated switchgear is improved, and production can be rationalized. Further, when the screw hole 33a provided in the insulating spacer 3 is constituted by the body of the insulating spacer 3 directly screw-machined, conventional filling is not required, and the production cost can be reduced. .

Embodiment 2. FIG.
3 is a cross-sectional view showing a tank connecting portion through an insulating spacer of a gas-insulated switchgear according to Embodiment 2, and FIG. 4 is a side cross-sectional view taken along the line IV-IV in FIG. 3 corresponds to a cross-sectional view taken along line III-III in FIG. In the figure, reference numeral 1 denotes a first tank, which is provided with a flange 12 having an outer flange portion 12O and an inner flange portion 12I alternately at two locations in the circumferential direction at one end (right side in the figure).

  The tank 1 has a shape such that a part of two large and small cylinders having different inner diameters are integrally combined as shown in the figure, but can be easily obtained by a known molding technique such as casting. it can. The second tank 2 has a flange 21 made of a general outer flange. Further, the insulating spacer 3 is exactly the same as that used in the first embodiment, and 12 pieces are provided in the circumferential direction. The through-hole 31 and the buried metal 33 having four screw holes 33a as the engaging holes are provided, and the buried metal 33 having the through-hole 31 and the screw hole 33a is the same as that shown in FIG. The illustration is omitted.

  12Oa is a fastening through-hole provided in the outer flange portion 12O (upper and lower parts in FIG. 4), and is provided at three positions in the upper part and three in the lower part at an angle of 30 degrees in the circumferential direction. It has been. 12Ia is a bottomed screw hole for fastening which is provided in the inner flange portion 12I, and is provided in a total of six locations at three positions on the left and right at an angle of 30 degrees in the circumferential direction. A total of twelve through holes 12Oa and tapped holes 12Ia are provided around the flange 12 at substantially equal angles.

  In addition to the through hole 12Oa and the screw hole 12Ia, the flange 12 of the first tank 1 has four insertion holes 12Ob for attaching the insulating spacer 3 at substantially equal angles in the circumferential direction (FIG. 4). See) provided.

  Reference numeral 45 shown in FIG. 4 denotes a bolt as an insulating spacer fixing member. From the insertion holes 12Ob provided in a total of four locations on the outer flange portion 12O, the screw holes 33a of the insulating spacer 3 are formed as in the first embodiment. The insulating spacer 3 can be attached to the first tank 1 first.

  44 is a bolt constituting the fastening means 4 for fastening the first and second tanks 1 and 2, and the screw hole of the inner flange portion 12 </ b> I of the first tank 1 from the flange 21 side of the second tank 2. Screwed into 12Ia, the tanks 1 and 2 are fastened together. The outer flange portion 12O fastens the tanks with bolts 46 and nuts 43. Since other reference numerals and configurations are the same as those in the first embodiment, description thereof is omitted.

  In Embodiment 2 configured as described above, it is necessary to join the insulating spacer 3 to the first tank 1 first, and the other second tank 2 has an outer flange shape. Also, the insulating spacer 3 is obtained by inserting the bolt 45 into the through hole 12Ob (shown by a broken line in FIG. 4) of the outer flange portion 12O, screwing it into the screw hole 33a not shown in the drawing of the insulating spacer 3, and fastening. In addition, the conductor 61 on the first tank 1 side can be attached in advance. As a result, the degree of freedom in designing the gas insulated switchgear is improved, and production can be rationalized.

Embodiment 3 FIG.
5 is a cross-sectional view showing a tank connecting portion through an insulating spacer of a gas-insulated switchgear according to Embodiment 3 of the present invention, and FIG. 6 is a cross-sectional side view taken along the line VI-VI in FIG. The cross-sectional view of FIG. 5 corresponds to the cross-sectional view taken along the line VV of FIG. In the figure, the first tank 1 is exactly the same as the first tank shown in the second embodiment.

  Reference numeral 2 denotes a second tank, which also has a flange similar to the first tank shown in the second embodiment, and the flanges are connected to each other in a state where the angle is rotated by 90 degrees with respect to the first tank 1. They are arranged in a manner to face each other. That is, the second tank 2 is provided with a flange 23 in which one end portion (left side in the drawing) is provided with a total of two outer flange portions 23O and inner flange portions 23I in the circumferential direction. The insulating spacer 3 is the same as that used in the first and second embodiments.

  23Oa is a fastening through-hole provided in the outer flange portion 23O, and is provided at a position of 30 degrees in the circumferential direction at a position indicated by the bolts 44 on the left side and right side in FIG. It has been. 23Ia is a bottomed screw hole for fastening provided in the inner flange 23I. As shown by a broken line in FIG. 6, a total of six places are provided in the upper and lower portions at an angle of 30 degrees in the circumferential direction. ing. A total of twelve through holes 23Oa and tapped holes 23Ia are provided around the flange 23 at equal angles as a whole.

  In addition to the through hole 23Oa and the screw hole 23Ia, the flange 23 of the second tank 2 has four insertion holes 23Ob used when the insulating spacer 3 is first attached at substantially equal angles in the circumferential direction (see FIG. 6). Other reference numerals and configurations are the same as those in the second embodiment, and a description thereof will be omitted.

In the third embodiment configured as described above, the flanges having two outer flange portions and two inner flange portions in the circumferential direction are opposed to each other by changing the angle by 90 degrees, and the outer flange portions 12O and 23O are opposed to each other. Since the insertion holes (12Ob and 23Ob) for attaching the insulating spacer 3 are provided in the part, the bolt 45 is inserted into the insertion holes (12Ob and 23Ob) not appearing in the drawing of the outer flange portion 12O or 23O, The insulating spacer 3, the conductor 61, or 62 can be attached to any one of the tanks first by being screwed into a screw hole 33 a as an engagement hole not shown in the drawing of the insulating spacer 3 and fastening.
As a result, the degree of freedom in designing the gas insulated switchgear is further improved, and the production can be rationalized.

By the way, in the description of the above embodiment, the case where a bolt that is screwed into the screw hole 33a as the engagement hole provided in the insulating spacer 3 is used as the insulating spacer fixing member 45 is exemplified. In short, other fixing means may be used as long as the insulating spacer 3 can be fixed to the flange.
Moreover, although the case where a volt | bolt or a volt | bolt and a nut is used was illustrated as the fastening member 4 between flanges, it is not limited to these, You may use another means as long as a flange can be mutually fastened.

  Further, it goes without saying that the number of the fastening members 4 and the insulating spacer fixing members 45 installed on the flanges is not limited to that of the embodiment. Further, in the case of the second and third embodiments, the buried metal 33 having the screw hole 33a as the engagement hole can be omitted by providing an engagement hole such as a screw hole in the material of the insulating spacer 3 itself. be able to. In addition, it goes without saying that various modifications and changes can be made within the spirit of the present invention, such as the shape of the insulating spacer 3 and the number of conductors 61.

  As described above, according to the present invention, the following effects can be obtained.

  According to the first aspect of the present invention, the insulating spacer is formed by using the insertion hole provided in the outer flange portion of the flange independently of the fastening member between the flanges, at least one of which has the outer flange portion. Since there are provided the insulating spacer fixing members that are fixed to one of the tanks, and there are fewer insulating spacer fixing members, it is possible to provide a gas insulated switchgear that is easy and easy to assemble and has improved design freedom. .

  According to the second invention described in claim 2, since one of the flanges of the first tank and the second tank is an outer flange and the other is an inner flange, in addition to the effects of the first invention, The degree of freedom in design is further improved, production can be streamlined, and production costs can be reduced.

  According to the third aspect of the present invention, since the screw hole is directly screwed in the material of the insulating spacer, the production cost can be reduced in addition to the effect of the first aspect. .

It is sectional drawing which shows the tank connection part through the insulation spacer of the gas insulated switchgear by Embodiment 1. FIG. It is an arrow sectional view which follows the II-II line of FIG. 1, and is a figure which shows an insulating spacer. It is sectional drawing which shows the tank connection part through the insulation spacer of the gas insulated switchgear which becomes Embodiment 2. FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. It is sectional drawing which shows the tank connection part through the insulation spacer of the gas insulated switchgear which becomes Embodiment 3. It is arrow sectional drawing in the VI-VI line of FIG. It is sectional drawing which shows the tank connection part through the insulation spacer of the conventional gas insulation switchgear. It is an arrow directional cross-sectional side view in the VIII-VIII line of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 1st tank 11, 11 flange, 11a through-hole, 11b insertion hole, 12O outer flange part, 12I inner flange part, 2 2nd tank, 22, 23 flange, 23O outer flange part, 23I inner flange part, 3 Insulating spacer, 31 Through hole, 33 Filling, 33a Engagement hole (screw hole), 4 Fastening member, 44, 46 bolt, 45 Insulating spacer fixing member (bolt), 61, 62 Conductor.

Claims (3)

  Tanks interposed between the first and second tanks, which are disposed with the flanges provided at the connecting portions facing each other, and between the flanges facing the first and second tanks. Gas insulation comprising an insulating spacer that divides the interior from each other, and a fastening member that is provided in plural at predetermined intervals in the circumferential direction of the flange having at least one outer flange portion and fastens the flanges with the insulating spacer interposed therebetween In the switchgear, a flange having an outer flange portion provided in one of the first tank and the second tank is penetrated to a position different from the positions of the plurality of fastening members provided in the circumferential direction. The insulating spacer has a plurality of engagement holes provided at positions corresponding to the insertion holes, and is inserted through the insertion hole of the one flange. Less than the number of the fastening members that engage with the engagement holes of the insulating spacer and fix the insulating spacers to one tank using the insertion holes provided in the outer flange portion of the flange independently of the fastening members. A gas insulated switchgear comprising an insulating spacer fixing member.   2. The gas insulated switchgear according to claim 1, wherein one of the flanges of the first tank and the second tank is an outer flange and the other tank is an inner flange.   The gas insulated switchgear according to claim 1 or 2, wherein the engagement hole provided in the insulating spacer is a screw hole directly screwed into a material of the insulating spacer.

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