JP2014035829A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear which is made to have an internal structure capable of contributing to stabilization of contact between a movable contact of movable-side electrode and a contractor of a fixing-side electrode, and miniaturization of a whole device.SOLUTION: In a built-in switching part 12, an insulation support cylinder 41 is inserted between respective electrode base parts of a movable-side electrode 13 and a fixing-side electrode 14 and both ends thereof are fixed to the respective electrode base parts 21, 31, respectively. In the insulation support cylinder 41, respective electrodes 13, 14 are insulated from each other, and connected and supported to each other.

Description

  The present invention relates to a gas insulated switchgear that opens and closes an electric circuit in a power system or the like.

2. Description of the Related Art Conventionally, a gas-insulated switchgear in which an open / close unit that opens and closes a high-voltage electric circuit, such as a disconnect switch and a ground switch, is installed in an insulating gas atmosphere for arc extinguishing.
For example, in the apparatus disclosed in Patent Document 1, a movable side electrode and a fixed side electrode are provided as an opening / closing part in an airtight container filled with an insulating gas, and the movable side electrode is movable while being always in contact with a contact of the movable side electrode. When the contact comes in contact with and separates from the contact of the fixed electrode, the electric circuit is opened and closed between the two electrodes.

  Further, the contact of each electrode is cylindrical and surrounded by a shield member (conductor), and further, an insulating coating (dielectric coating) is applied to the tip portions of each shield member facing each other. Has been. That is, the shield member main body and the insulating coating form a composite structure, and each electrode has a higher insulating performance.

Japanese Patent No. 3860553

  By the way, when an electrode having a contact or a shield member is supported in a cantilever manner at its base end, as in the apparatus of Document 1, a positional shift (core) between the contacts of both electrodes that the movable contact straddles over. There is a possibility that the contact state between the movable contact and the contact of the fixed electrode is not stable. In other words, in order to stabilize the contact state between the movable contact and the contact of the fixed electrode, high accuracy is required for assembling both electrodes.

  In addition, when the electrode is cantilevered, it is necessary to increase the strength of the support portion of the electrode proximal end. When the electrode is separately supported with respect to the sealed container at a portion other than the proximal end portion, the support portion In addition to its own arrangement / mounting space, a similar space for insulation of the support portion is required. This is detrimental to the downsizing of the opening / closing part and the entire apparatus.

Of course, it is desired to improve the insulation performance between the electrodes and reduce the distance between the electrodes, thereby reducing the size of the opening / closing section and the entire apparatus.
The present invention has been made to solve the above-mentioned problems, and its purpose is to stabilize the contact between the movable contact of the movable electrode and the contact of the fixed electrode, and to contribute to the downsizing of the entire apparatus. An object of the present invention is to provide a gas insulated switchgear having an internal structure.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the predetermined electric circuit is closed by the movable contact that contacts the contact of the movable side electrode contacting the contact of the fixed side electrode, A gas-insulated switchgear comprising an open / close part that opens the predetermined electric circuit by being separated from a contact of the fixed side electrode by an operation of a movable contact in an insulating gas atmosphere in a sealed container, A structure in which an insulating support member is interposed between each electrode base portion of the movable side electrode and the fixed side electrode and fixed to each electrode base portion, and the insulating support member connects and supports each other together with insulation of each electrode; did.

  According to the present invention, in the built-in opening / closing part, an insulating support member is interposed between the electrode bases of the movable side electrode and the fixed side electrode and fixed to the respective electrode bases. Together with insulation, they are connected and supported. That is, by adopting this structure, both electrodes can be assembled relatively accurately. For this reason, the relative positional accuracy of the contacts of both electrodes becomes high (the misalignment is small), and the contact state of each of the movable contacts contacting the contacts of both electrodes is stabilized. Further, by adopting the above structure, the support of the electrode is stabilized without increasing the strength and the number of support portions of the electrode with respect to the sealed container. Therefore, simplification of support of the electrode with respect to the hermetic container and insulation of the support portion can be omitted, which contributes to downsizing of the opening / closing portion and, consequently, downsizing of the gas insulated switching device as a whole.

According to a second aspect of the present invention, in the gas insulated switchgear according to the first aspect, the insulating support member has a cylindrical shape and is disposed so as to accommodate the contacts of the electrodes.
In this invention, the insulating support member is formed in a cylindrical shape, and is disposed so as to accommodate the contacts of each electrode. That is, both the electrodes can be accurately and stably supported by one cylindrical insulating support member.

  According to a third aspect of the present invention, in the gas insulated switchgear according to the second aspect, the insulating support member includes a pair of cylindrical conductors surrounding the contacts of the electrodes, and the height h1 of the conductors. The height ratio h1 / h2 of the contactor height h2 was set to 0.8 to 1.4.

  In this invention, the insulating support member is provided with a pair of cylindrical conductors that surround the contacts of each electrode, and the height ratio h1 / h2 between the height h1 of the conductors and the height h2 of the contacts is It is set to 0.8 to 1.4. In other words, the conductor provided in the insulating support member functions as a shield member for the electrode contact that improves the insulation of the electrode, and the electric field around the electrode is set by setting the height ratio of the conductor to the contact to an appropriate value. (See FIG. 2), which can contribute to the improvement of the insulating properties of the electrode. If the insulating properties of the electrodes are improved, the distance between the electrodes can be reduced, which contributes to downsizing of the apparatus.

  According to a fourth aspect of the present invention, in the gas-insulated switchgear according to the second or third aspect, the outer surface of the cylindrical insulating support member is curved such that the central portion in the axial direction protrudes outward from the end portion. Shaped.

  In the present invention, the outer side surface of the insulating support member is formed in a curved shape in which the central portion in the axial direction is convex outward from the end portion. That is, by increasing the creepage distance of the insulating support member by making the outer surface curved, it is possible to contribute to the improvement of the insulating properties of the electrode and to the miniaturization of the device.

  According to a fifth aspect of the present invention, in the gas insulated switchgear according to any one of the second to fourth aspects, the axially central portion of the inner side surface of the cylindrical insulating support member is located inside the end portion. It was made into the inclination shape which becomes convex and expands gradually toward the end from the center.

  According to the present invention, on the inner side surface of the insulating support member, the central portion in the axial direction protrudes inward from the end portion, and is formed in an inclined shape that gradually expands from the central portion toward the end portion. In other words, when the insulating support member is used in a horizontal state (a state in which the axial direction is directed horizontally), dust or the like that has entered the inner side surface of the insulating support member is formed between the electrodes due to the inclined shape of the inner side surface. The movement toward the end side is facilitated without staying in the central portion of the insulating support member. Thereby, it can contribute to the insulation improvement of an electrode and can contribute to size reduction of an apparatus.

A sixth aspect of the present invention is the gas insulated switchgear according to any one of the first to fifth aspects, wherein the insulating support member is provided with a through-hole penetrating inside and outside.
In this invention, since the insulating support member is provided with a through-hole penetrating the inside and outside of the insulating support member, it is possible to check the internal state of the insulating support member with the insulating support member attached, for example, to check a movable contact or a contact. In addition, the pressure change in the insulating support member when the movable contact is operated can be reduced, the operation force of the movable contact can be reduced, and the heat can be efficiently exhausted in the insulating support member. .

  According to the present invention, it is possible to provide a gas insulated switchgear having an internal structure that can contribute to the stabilization of the contact between the movable contact of the movable electrode and the contact of the fixed electrode and the miniaturization of the entire device.

The block diagram of the gas insulated switchgear in one Embodiment. The graph which shows the relationship of the electric field strength with respect to ratio of a buried conductor height / contactor height. The block diagram of the gas insulated switchgear in another example. The block diagram of the gas insulated switchgear in another example.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, the gas insulated switchgear 10 includes an open / close unit 12 that opens and closes a high-voltage electric circuit such as a disconnect switch or a ground switch in a sealed container 11 filled with an insulating gas for arc extinguishing. It becomes. The opening / closing part 12 includes a movable side electrode 13 and a fixed side electrode 14 connected to the respective electric paths, and is supported with respect to the sealed container 11.

  The movable side electrode 13 is integrally provided with a cylindrical contact 22 on an electrode base 21. A cylindrical movable contact 23 is inserted inside the contact 22, and the tip contact portion of the contact 22 and the outer surface of the movable contact 23 are brought into contact with each other. In addition, the movable contact 23 is connected to the insulating operation rod 24 at the base end, and can move forward and backward in the axial direction of the contact 22 while contacting the contact 22 in conjunction with the operation of the operation rod 24. Yes.

  Similarly to the contact 22 of the movable electrode 13, the fixed electrode 14 is integrally provided with a cylindrical contact 32 on the electrode base 31. The fixed-side electrode 14 and the movable-side electrode 13 are arranged so that the axes of the contacts 32 and 22 are on the same straight line and the tips of the contacts 32 and 22 face each other.

  The axial length L1 of the movable contact 23 is longer than the inter-electrode distance L2 between the tips of the contacts 22 and 32 of the electrodes 13 and 14. Therefore, at the position where the movable contact 23 of the movable side electrode 13 is most advanced (the state shown in FIG. 1), the distal end portion of the movable contact 23 is inserted into the contact 32 of the fixed side electrode 14. Contact the part. That is, both the electrodes 13 and 14 are in a connected state (closed state) by the contacts 22 and 32 and the movable contact 23. On the other hand, at the position where the movable contact 23 is most retracted, the movable contact 23 is retracted into the contact 22 of the movable electrode 13 and is separated from the contact 32 of the fixed electrode 14. That is, both electrodes 13 and 14 are in a disconnected state (open circuit state).

  An insulating support cylinder 41 is interposed between the electrode bases 21 and 31 of the movable side electrode 13 and the fixed side electrode 14. The insulating support cylinder 41 is an insert-molded product formed into a cylindrical shape with an insulating resin (for example, epoxy resin) so that the cylindrical embedded conductors 42 and 43 are embedded at both ends in the axial direction. The embedded conductors 42 and 43 at both ends are fixed to the electrode bases 21 and 31 by fixing bolts 44 so that the insulating support cylinder 41 is positioned on the outer peripheral side with a predetermined distance from each contact 22 and 32. Has been. The insulating support cylinder 41 is structured to support the electrode bases 21 and 31 by connecting the electrode bases 21 and 31 with a rigid body while insulating between the electrodes 13 and 14.

  Further, regarding the cylindrical shape of the insulating support cylinder 41, the inner surface 41a of the support cylinder 41 is linear in the axial direction in which the inner diameter r1 of the central portion in the axial direction and the inner diameter r2 of both end portions in the axial direction are equal. The outer surface 41b of the support cylinder 41 has a curved shape that protrudes radially outward in which the outer diameter r3 at the central portion in the axial direction is larger than the outer diameter r4 at both end portions in the axial direction. The insulating support cylinder 41 has a curved shape that protrudes outward on the outer surface 41b, makes the creeping distance L3 as long as possible, and has an outer surface shape that is nearly perpendicular to the equipotential line between the electrodes 13 and 14. . The insulating support cylinder 41 has a shape with improved insulation resistance while keeping its axial length L4 (interelectrode distance L2) small.

Further, the embedded conductors 42 and 43 at both ends of the insulating support cylinder 41 function as shield members for the respective contacts 22 and 32 located inside thereof.
Here, FIG. 2 shows a change in electric field strength with respect to a ratio h1 / h2 between the height h1 of the embedded conductor 42 and the height h2 of the contactor 22. The height ratio h1 / h2 is “1”, that is, the electric field strength when the embedded conductor 42 and the contactor 22 have the same height is indicated by a relative value “1”. Since the results of the embedded conductor 43 and the contact 32 are the same, the embedded conductor 42 and the contact 22 side will be described as a representative.

  As shown in FIG. 2, when the height ratio h1 / h2 between the buried conductor 42 and the contact 22 is smaller than “1”, that is, when the contact 22 is set higher than the buried conductor 42. As the maximum electric field at the tip of the contactor 22 increases and the ratio h1 / h2 decreases (the contactor 22 increases), the electric field strength gradually increases from “1”. On the other hand, when the height ratio h1 / h2 between the embedded conductor 42 and the contactor 22 is larger than “1”, that is, when the embedded conductor 42 is set to be higher than the contactor 22, the embedded conductor 42 is As the creeping electric field of the insulating support cylinder 41 has a larger ratio h1 / h2 (the higher the embedded conductor 42), the electric field strength in this case gradually increases from "1". The electric field strength is the smallest when the height ratio h1 / h2 is in the range of “1” to “1.2”, and the electric field strength is even when the height ratio h1 / h2 is within the range of “0.8” to “1.4”. Is a sufficiently small preferred range. In the present embodiment, the buried conductor 42 is slightly higher than the contact 22 and the height ratio h1 / h2 of the contact 22 and the buried conductor 42 is minimized so that the electric field strength becomes the smallest near “1.1”. The height dimension is set. The contact 32 and the embedded conductor 43 are also set to the same height.

  Next, with respect to the operation of the present embodiment, an insulating support cylinder 41 is inserted between the electrode bases 21 and 31, and both the electrode bases 21 and 31 are connected by a rigid body while achieving electrical insulation. The relative displacement between the electrodes 13 and 14 is small, and both the electrodes 13 and 14 can be assembled with high accuracy. Therefore, the relative positional accuracy of the contacts 22 and 32 of both the electrodes 13 and 14 is high (the core misalignment is small), and the contact 22 and 32 of the movable contact 23 that is in contact with both the contacts 22 and 32 is in contact with each of the contacts 22 and 32. The contact state is stable.

  Further, by adopting the above structure, the support of the electrodes 13 and 14 is stabilized without increasing the strength and the number of support portions of the electrodes 13 and 14 with respect to the sealed container 11. Therefore, simplification of support of the electrodes 13 and 14 with respect to the sealed container 11 and insulation of the support part can be omitted, which contributes to downsizing of the opening / closing part 12 and further downsizing of the gas insulated switchgear 10 as a whole.

  Further, the insulation support cylinder 41 has high insulation resistance by optimizing the heights h1 and h2 of the contacts 22 and 32 and the embedded conductors 42 and 43 and optimizing the shape of the outer surface 41b of the insulation support cylinder 41. As a result, it is possible to shorten the axial length L4 of the insulating support cylinder 41 when the insulating performance is equivalent to that of the existing one. Therefore, the inter-electrode distance L2 between the contacts 22 and 32 of the electrodes 13 and 14 can be reduced, which contributes to the downsizing of the switching unit 12 and the downsizing of the entire switching device 10.

Next, characteristic effects of the present embodiment will be described.
(1) In the built-in opening / closing part 12, an insulating support cylinder 41 is inserted between the electrode bases 21 and 31 of the movable side electrode 13 and the fixed side electrode 14 and fixed to the electrode bases 21 and 31, respectively. The support cylinder 41 is connected and supported together with the insulation of the electrodes 13 and 14. That is, by adopting this structure, both the electrodes 13 and 14 can be assembled relatively accurately. For this reason, the relative positional accuracy of the contacts 22 and 32 of both electrodes 13 and 14 is high (the core misalignment is small), and each contact of the movable contact 23 that contacts the contacts 22 and 32 of both electrodes 13 and 14. The contact state with 22 and 32 can be made stable.

  Further, by adopting the above structure, the support of the electrodes 13 and 14 is stabilized without increasing the strength and the number of support portions of the electrodes 13 and 14 with respect to the sealed container 11. Therefore, simplification of support of the electrodes 13 and 14 with respect to the sealed container 11 and insulation of the support portion can be omitted, which can contribute to downsizing of the opening / closing unit 12 and further downsizing of the gas insulated switchgear 10 as a whole.

(2) The two electrodes 13 and 14 can be accurately and stably supported by the single insulating support cylinder 41 disposed so as to accommodate the contacts 22 and 32 of the electrodes 13 and 14.
(3) The insulating support cylinder 41 is provided with a pair of cylindrical embedded conductors 42 and 43 surrounding the contacts 22 and 32 of the electrodes 13 and 14 respectively. The height h1 of the conductors 42 and 43 and the contact 22 , 32 and the height ratio h1 / h2 with respect to the height h2 is set within a range of 0.8 to 1.4. That is, the conductors 42 and 43 provided in the insulating support cylinder 41 function as a shield member for the contacts 22 and 32 of the electrodes 13 and 14 that improve the insulation of the electrodes 13 and 14, and the conductors 42 and 43 and the contact 22 , 32 can be set to an appropriate value, the electric field around the electrodes 13, 14 can be reduced (see FIG. 2), and the insulation of the electrodes 13, 14 can be improved. If the insulating properties of the electrodes 13 and 14 are improved, the distance L2 between the electrodes 13 and 14 can be reduced, which can contribute to the downsizing of the opening / closing part 12 and the opening / closing device 10.

  (4) On the outer surface 41b of the insulating support cylinder 41, the central portion in the axial direction is formed in a curved shape that protrudes outward from the end portion. That is, by making the outer surface 41b curved and increasing the creepage distance L3 of the insulating support cylinder 41, it is possible to contribute to the improvement of the insulation properties of the electrodes 13 and 14, and to contribute to the miniaturization of the opening / closing part 12 and the opening / closing device 10. Can do.

(5) Since the insulating support cylinder 41 is made of an insert-molded product of the conductors 42 and 43 made of insulating resin, it can contribute to the improvement of the assembling property of the opening / closing part 12 (opening / closing device 10).
(6) The insulating support cylinder 41 is fixed to the electrode bases 21 and 31 with conductors 42 and 43 inserted in an insulating resin. That is, since the conductors 42 and 43 functioning as shield members also serve as the fixing portion of the insulating support cylinder 41, there is no need to separately use a fixing member.

In addition, you may change embodiment of this invention as follows.
Although the inner side surface 41a of the insulating support cylinder 41 is linear in the axial direction, for example, as shown in FIG. 3, the inner diameter r1a of the central portion of the inner side surface 41a is made smaller than the inner diameter r2 of the end portion (axial direction). The inner surface 41a may be an inclined surface 41c that gradually expands from the axial center to the end. According to this configuration, when the insulating support cylinder 41 is used in a horizontal state (a state in which the axial direction is oriented horizontally), dust or the like that has entered the inner side surface 41a side of the insulating support cylinder 41 is changed to the inner side surface 41a. Due to the inclined shape (inclined surface 41c), the movement toward the end side is promoted without staying in the central portion of the insulating support cylinder 41 between the electrodes 13,14. Thereby, it can contribute to the insulation improvement of the electrodes 13 and 14, and can contribute also to size reduction of the opening-and-closing part 12 and the switchgear 10. FIG.

  -As shown in FIG. 4, you may provide the through-hole 41d which penetrates the inner surface 41a and the outer surface 41b of the insulation support cylinder 41. As shown in FIG. According to this configuration, it is possible to check the state of the inside of the insulating support cylinder 41 with the insulating support cylinder 41 attached, for example, to check the movable contact 23 and the contacts 22 and 32, or to insulate the movable contact 23 when it is operated. It is expected that the pressure change in the support cylinder 41 can be reduced, the operating force of the movable contact 23 (the operation force of the operation rod 24) can be reduced, and the heat exhaust in the insulating support cylinder 41 can be efficiently performed. it can. The shape, position, and number of the through holes 41d are determined according to the expected effect.

Other than the modification of the insulating support cylinder 41 shown in FIGS. 3 and 4, for example, an insulating resin other than the epoxy resin may be used for the insulating support cylinder 41.
Although the insulating support cylinder 41 is an insert-molded product of the conductors 42 and 43 made of insulating resin, the insulating resin portion and the conductors 42 and 43 may be assembled separately.

  The conductors 42 and 43 embedded in the insulating support cylinder 41 are fixed to the electrode bases 21 and 31 by the fixing bolts 44, but may be fixed at portions other than the conductors 42 and 43. In that case, you may prepare the member for fixation separately. Further, a fixing member other than the fixing bolt 44 may be used.

Although the outer side surface 41b of the insulating support cylinder 41 has a curved shape with a convex central portion in the axial direction, the outer side surface 41b may be a linear outer side surface in the axial direction.
A cylindrical insulating support cylinder 41 is used as an insulating support member for insulating and supporting the electrodes 13 and 14 (electrode bases 21 and 31), but other shapes such as a plurality of rod-shaped or plate-shaped members are used. It is good.

Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
(A) In the gas insulated switchgear according to claim 3,
The gas-insulated switchgear according to claim 1, wherein the insulating support member is an insert molded product of the conductor made of an insulating resin.

(B) In the gas insulated switchgear described in (a) above,
The gas insulated switchgear characterized in that the insulating support member is fixed to the electrode base with the conductor inserted into the insulating resin.

  DESCRIPTION OF SYMBOLS 10 ... Gas insulation switchgear, 11 ... Sealed container, 12 ... Opening / closing part, 13 ... Movable side electrode, 14 ... Fixed side electrode, 21, 31 ... Electrode base, 22, 32 ... Contact, 23 ... Movable contact, 41 ... Insulating support cylinder (insulating support member), 41a ... inner side surface, 41b ... outer side surface, 41c ... inclined surface, 41d ... through hole, 42, 43 ... embedded conductor (conductor).

Claims (6)

The movable contact that contacts the contact of the movable side electrode also contacts the contact of the fixed side electrode, thereby closing the predetermined electric circuit and separating the contact of the fixed side electrode by operating the movable contact. A gas-insulated switchgear in which an opening / closing part having the predetermined electric circuit as an open circuit is installed in an insulating gas atmosphere in a sealed container,
A structure in which an insulating support member is interposed between each electrode base portion of the movable side electrode and the fixed side electrode and fixed to each electrode base portion, and the insulating support member connects and supports each other together with each other's insulation. A gas insulated switchgear characterized by the above. The gas insulated switchgear according to claim 1,
A gas insulated switchgear characterized in that the insulating support member has a cylindrical shape and is arranged so as to accommodate the contacts of each electrode. The gas insulated switchgear according to claim 2,
The insulating support member includes a pair of cylindrical conductors surrounding the contacts of the electrodes, and a height ratio h1 / h2 between the height h1 of the conductors and the height h2 of the contacts is set to 0. A gas insulated switchgear characterized by being set to 8-1.4. The gas insulated switchgear according to claim 2 or 3,
A gas-insulated switchgear characterized in that the outer surface of the cylindrical insulating support member has a curved shape with an axially central portion protruding outward from the end. The gas insulated switchgear according to any one of claims 2 to 4,
A gas-insulated opening / closing feature characterized in that the inner side surface of the insulating support member having a cylindrical shape has an inclined shape in which the central portion in the axial direction protrudes inward from the end portion and gradually expands from the central portion toward the end portion. apparatus. In the gas insulated switchgear according to any one of claims 1 to 5,
A gas insulated switchgear characterized in that the insulating support member is provided with a through-hole penetrating inside and outside.