JP5389500B2 - Switch - Google Patents

Description

  The present invention relates to a switch that is inserted in the middle of an electric circuit such as a distribution system to open and close the electric circuit.

  In a power distribution system, a switch is inserted in the middle of a high-voltage distribution line so that the switch is opened in the event of an accident or a maintenance check of the distribution line. This type of switch includes a metal case to be mounted, and accommodates a three-phase blocking portion having a fixed electrode and a movable electrode in the case. Since this type of switch is mounted on a utility pole, it is preferable to make it as small as possible. However, when trying to reduce the size, between the three-phase blocking parts and between the blocking parts of the two-phases and the case (between ground) The distance becomes shorter and the insulation distance becomes insufficient.

  Therefore, in the switch disclosed in Patent Document 1, an insulating barrier having a shape covering a blocking portion made up of a fixed electrode and a movable electrode is provided for each phase blocking portion, and the three-phase blocking portions are mutually connected by these insulating barriers. Insulation between the gaps between both ends and both ends and the case is reinforced. In the switch shown in Patent Document 1, in order to prevent the adjacent insulation barriers from moving relative to each other, a locking means for locking each insulation barrier is provided.

  Also, in this type of switch, since the pressure in the case increases when a ground fault or short circuit accident occurs in the case, a means for releasing the pressure in the case is taken. In the switch shown in Patent Document 2, a case that accommodates a blocking portion is configured by a case main body having an open lower end, and a cover that closes the opening of the case main body through a packing, A tongue-shaped connecting portion that can be deformed is formed in each of the opening and the cover, and the cover and the case main body are connected by connecting these connecting portions to each other.

  In this switch, when the pressure in the case rises, the cover is displaced downward by plastically deforming the connecting portion that connects the case main body and the cover, thereby opening the case main body and the cover. A pressure-release gap is formed between them, and the pressure in the case is released through this gap.

JP 2002-84607 A JP-A-8-31275

  If constituted as shown in Patent Document 2, it is possible to perform a pressure releasing operation when the pressure in the case increases with a relatively simple configuration. However, when an insulating barrier as shown in Patent Document 1 is provided in the switch shown in Patent Document 2, if a ground fault occurs at one of the U, V, and W three-phase blocking portions, When a short circuit occurs between two phases, an abnormal pressure increase may occur locally in the insulating barrier covering the interrupting part where the accident occurred. When an abnormal pressure rise occurs locally in the case, not only the parts in the vicinity are damaged, but also in the connection part connecting the case body and the cover, near the place where the pressure rise has occurred. Since an unreasonable force is applied to the connecting portion, the connecting portion may be damaged, and the gap between the opening of the case body and the cover may be enlarged. In the worst case, the cover may be removed. When such a situation occurs, there is a risk that fragments of parts damaged in the case may be scattered outside the case.

  Therefore, when an insulating barrier is provided in a switch provided with a pressure release means as disclosed in Patent Document 2, it is necessary to take care not to cause a local abnormal pressure increase in the case.

  An object of the present invention is to provide a switch capable of strengthening insulation between circuit breakers and between grounds without causing a local abnormal pressure increase in a case at the time of an accident.

  The present invention provides a case body having a case body having a lower end opened and a cover that is provided so as to airtightly close the opening of the case body and is connected to the case body by a connecting portion, and the case body is arranged in one direction. A three-phase blocking portion housed in the case, and when the inside of the case becomes high pressure, the connecting portion is deformed to create a gap between the opening of the case body and the cover, thereby reducing the pressure in the case. It relates to a switch configured to be opened.

In the first invention disclosed in the present application, plate-like insulating barriers are disposed between the three-phase blocking portions housed in the case and outside the blocking portions of the both-end phases. Each insulating barrier is disposed with its width direction oriented in a direction perpendicular to the direction in which the plurality of blocking portions are arranged, and an upper portion at both ends in the width direction and a lower portion at one end in the width direction are provided via a support member. Supported by the case body. Further, when the pressure is released, the deformed portion of the insulating barrier is disposed in the vicinity of the opening.

  As described above, plate-shaped insulating barriers are arranged between the three-phase blocking portions and outside the blocking portions of both end phases, respectively, and upper portions at both ends in the width direction of each insulating barrier and lower portions at one end in the width direction. Since the bottom of the other end in the width direction of each insulation barrier is not restrained, the insulation barrier can be used in the event that an accident occurs at the shut-off portion and the surrounding pressure rises. The lower part of the other end in the width direction can be displaced to release the pressure to the side. Therefore, it is possible to prevent a local abnormal pressure increase from occurring in the case at the time of an accident, and an excessive force is applied to the connection part between the case main body and the cover due to the local abnormal pressure increase. It is possible to prevent the gap between the gaps from being enlarged and the cover from being removed.

In the present application, the second invention is also disclosed. Also in the second invention, plate-like insulating barriers are disposed between the three-phase blocking portions housed in the case and outside the blocking portions of the both-end phases. Each insulating barrier is disposed with its width direction oriented perpendicular to the direction in which the plurality of blocking portions are arranged. In the second aspect of the invention, only the upper portions at both ends in the width direction of each insulating barrier are supported. It is supported by the case body via the member. Further, when the pressure is released, the deformed portion of the insulating barrier is disposed in the vicinity of the opening.

  As described above, if the structure is such that only the upper portions at both ends in the width direction of each insulating barrier are supported by the case via the support member, the lower portions at both ends in the width direction of each insulating barrier are not restrained, so an accident occurs at the blocking portion. When the pressure in the vicinity of the blocking portion is increased and the lower portions at both ends in the width direction of the respective insulation barriers are displaced together, the pressure can be released quickly, more reliably in the case than in the case of the first invention. A local abnormal pressure rise can be prevented from occurring.

  The upper portions at both ends in the width direction of each of the insulating barriers may be supported on the side wall of the case main body via a support member, or may be supported on the ceiling portion side of the case main body via the support member.

  According to the first invention, the plate-like insulating barriers are disposed between the three-phase blocking portions and outside the blocking portions of the two end phases, respectively, and upper portions at both ends in the width direction of each insulating barrier and one end in the width direction. Since the bottom of the other end in the width direction of each insulation barrier is not restrained, an accident occurs at the location of the blocking part in the case and the pressure in the vicinity is When raised, the lower part of the other end in the width direction of each insulating barrier can be displaced to release the pressure laterally. Therefore, it prevents the local abnormal pressure rise in the case at the time of the accident, the local abnormal pressure rise breaks the connection part of the case main body and the cover, and the gap between the case main body and the cover becomes It is possible to prevent enlargement or removal of the cover, and to improve safety.

  According to the second aspect of the invention, each insulating barrier is supported only at the upper part thereof, so that the lower parts at both ends in the width direction of the insulating barrier are not restrained together. Therefore, more reliably than in the case of the first invention. A local increase in pressure can be prevented, and safety can be improved.

(A) is a longitudinal cross-sectional view of the switch which concerns on one Embodiment of this invention, (B) is the II-II sectional view taken on the line of (A). (A) is the longitudinal cross-sectional view which abbreviate | omitted a part of component part of the switch concerning this embodiment, and showed only the principal part, (B) is the III-III sectional view taken on the line of (A). is there. (A) is a longitudinal cross-sectional view which shows the state of the principal part at the time of the pressure release of the switch concerning this embodiment, (B) is the IV-IV sectional view taken on the line of (A). (A) is the front view which showed the state of the principal part at the time of normal of the switch concerning this embodiment, (B) is the front view which showed the state of the principal part at the time of pressure release operation | movement.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1-4, 10 is a case of a switch. The case 10 is composed of a case main body 11 which is formed so as to form a substantially rectangular parallelepiped as a whole and whose lower end is opened, and a cover 12 which closes an opening at the lower end of the case main body 11. In this specification, the direction in which the length of the case 10 is long (the vertical direction in FIG. 1B) is the longitudinal direction of the case, and the direction perpendicular to both the longitudinal direction and the height direction is the width direction of the case. To do. In the present embodiment, by devising a coupling structure between the case body 11 and the cover 12 that closes the opening at the lower end, the opening at the lower end of the case body 11 and the cover 12 when the pressure in the case 10 rises. A pressure relief operation is performed by creating a gap therebetween. Details of the coupling structure of the cover body 11 and the cover 12 will be described later.

  Reference numerals 13 and 14 denote bushings on the power supply side and the load side that are attached through the case main body 11. In the present embodiment, a total of six bushings, that is, a U, V, W three-phase power supply side bushing 13 and a U, V, W three-phase load side bushing 14 are provided. In this embodiment, in FIG. 1 (B), the three bushings 13 and 14 arranged in order from the bottom to the top are U, V, and W three-phase bushings, respectively.

  As shown in FIG. 1, one end of a power supply side lead conductor 13A is connected to the inner end portion of the power supply side bushing 13 by a bolt, and the load side lead conductor 14A is connected to the inner end portion of the load side bushing 14 similarly. One end of each is connected by a bolt.

  A mounting bracket 20 is fixed to the upper part of the case body 11, and the mounting bracket 20 has a three-phase first support lever 21 and a three-phase with the axis line in the vertical direction (the height direction of the case). The upper ends of the second support insulators 22 are respectively fixed by bolts. The support insulators 21 and 22 for each phase are disposed between the corresponding phase bushings 13 and 14.

  A fixed electrode 23 is connected to the lower end of the first support insulator 21 by a bolt (not shown), and an arc extinguishing chamber 24 is fixed so as to cover the fixed electrode 23. Furthermore, the other end of the power supply side lead conductor 13A having one end connected to the corresponding phase bushing 13 is connected to the fixed electrode 23 by a bolt (not shown).

  A movable electrode support conductor 25 is connected to the lower end portion of the second support insulator 22 by a bolt, and a proximal end portion of a movable electrode 26 formed in a substantially letter-shaped shape is connected to the movable electrode support member 25 via a shaft 27. It is connected so that it can rotate. The movable electrode 26 is operated by an operation mechanism to be described later, and a closed position where the tip of the movable electrode 26 comes into contact with the fixed electrode 23 through the arc extinguishing chamber 24 and the tip of the movable electrode 26 from the arc extinguishing chamber 24 as shown in FIG. It is rotated between the open position where it is separated and a predetermined insulation distance is separated from the fixed electrode 23. The other end of the load-side lead conductor 14A, one end of which is connected to the corresponding phase bushing 14, is connected to the movable electrode support conductor 25 by a bolt.

  Reference numeral 28 denotes a drive shaft that is provided so as to extend in the longitudinal direction of the switch case 10 and is rotatably supported with respect to the case 10. One end of the drive shaft 28 is connected to a drive mechanism K (not shown) that is operated by an operation handle (not shown) attached to the outside of the case 10. The drive mechanism K is provided with a fast-moving mechanism such as a toggle mechanism, and when the operating handle (not shown) is operated, the drive shaft 28 is driven to rotate at once in the opening direction and the closing direction. A rear end portion of a drive lever 29 is fixed to the drive shaft 28, and one end of a drive link 30 made of an insulating material is rotatably connected to a front end portion of the drive lever 29. The other end of the drive link 30 is rotatably connected to the movable electrode 26, and the rotational displacement of the drive shaft 26 is transmitted to the movable electrode 26 via the drive lever 29 and the drive link 30. The circuit can be rotated between the open position and the closed position.

  A blocking part is constituted by the fixed electrode and the arc extinguishing chamber supported by each first supporting insulator 21 and the movable electrode supported by the second supporting insulator 22, and a U, V, W three-phase blocking part is formed. The case 10 is arranged in the longitudinal direction.

  2, in order to clearly show the configuration of the insulating barrier 40, a part of the bushings 13, 14 shown in FIGS. 1A and 1B, the power supply side lead conductor 13A, and the load side lead conductor 14A. , Mounting bracket 20, first support lever 21, second support lever 22, fixed electrode 23, arc extinguishing chamber 24, movable electrode support member 25, movable electrode 26, shaft 27, drive shaft 28, drive lever 29, and drive The link 30 is not shown.

  Next, a connection structure between the case main body 11 and the cover 12 for performing a pressure releasing operation when the internal pressure of the case 10 increases will be described. The illustrated case body 11 includes a box-shaped portion 11A that is formed in a substantially rectangular parallelepiped shape and has an open lower end, a packing contact portion 11B that protrudes horizontally from the lower end of the box-shaped portion 11A, and a packing contact portion 11B. A skirt portion 11C that is bent at a right angle downward from the outer end portion is integrally provided.

  The skirt portion 11C is provided so as to extend over the entire peripheral edge of the lower end opening of the upper case 11 so that the cross section thereof has a rectangular shape similar to the cross section of the box-shaped portion 11A of the upper case 11. A total of four tongue-like case body side connecting portions 11D are provided in a state where the long side portions 11C1 and 11C2 facing each other of the long side portions 11C1 and 11C2 of the skirt portion 11C are formed to protrude downward. Yes.

  A packing 15 made of rubber or the like is in contact with the packing contact portion 11B.

  The ceiling portion 11A1 of the box-shaped portion 11A of the case body 11 is formed in a gable shape so as to facilitate the flow of rainwater.

  The side wall (side wall along the long side of the cross section of the box-shaped part) 11A2 and 11A3 of the box-shaped part 11A of the case body 11 has three bushing attachment holes arranged in the horizontal direction (horizontal direction). The three-phase bushings 13 and 14 are attached in a state where the bushing attachment holes are hermetically penetrated.

  The cover 12 includes a rectangular bottom wall portion 12A, a standing wall portion 12B that stands vertically upward from the peripheral edge of the bottom wall portion 12A, and a packing contact portion that projects horizontally outward from the upper end of the standing wall portion 12B. 12C and a folded portion 12D folded downward from the peripheral edge of the packing abutting portion 12C, and the standing wall portion 12B, the packing abutting portion 12C, and the folded portion 12D A frame portion 12E is formed.

  The outer frame portion 12E composed of the standing wall portion 12B, the overhang portion 12C, and the folded portion 12D of the cover 12 is provided so as to extend over the entire peripheral edge portion of the bottom wall portion 12A, and the opposed long side portions of the folded portion 12D. A total of four tongue-like cover-side connecting portions 12F projecting downward from positions corresponding to the upper case flexure portion 11D are provided at both ends in the longitudinal direction.

  The cover side connecting portion 12F is formed in the same shape as the case main body side connecting portion 11D, the folded portion 12D of the cover 12 is fitted inside the skirt portion 11C of the case main body 11, and the packing contact portion 12C is the packing. 15, the case 10 is disposed in a state in which the corresponding ones of the case main body side connecting portion 11 </ b> D and the cover side connecting portion 12 </ b> F are superposed with each other. It is formed.

  Bolt fitting holes that can be aligned with each other in a state where the case main body side coupling portion 11D and the cover side coupling portion 12F are respectively penetrated are provided, and the bolts 16 fitted into these bolt fitting holes, and the bolts 16 The superposed coupling portions 11D and 12F are fastened by the nut 17 screwed into the nut.

  The case main body side connecting portion 11D and the cover side connecting portion 12F are formed in a shape that can be bent when the internal pressure of the case 10 rises (in this embodiment, a tongue-like shape), and the pressure inside the case 10 has an allowable value. The strength of each of the connecting portions is set so that both connecting portions are plastically deformed and a pressure release gap is formed between the cover 12 and the opening at the lower end of the case main body 11 when exceeding.

  The case main body side connecting portion 11D, the cover side connecting portion 12F, the bolt 16, and the nut 17 constitute a pressure relief device.

  As shown in FIG. 2, a total of four rectangular plate-like insulating barriers 40A to 40D made of an insulating material are disposed between the three-phase blocking portions and outside the blocking portions of the two end phases, respectively. Has been placed. The four insulating barriers 40A to 40D have their plate surfaces directed in the direction in which the three-phase blocking portions are arranged in parallel (the longitudinal direction of the case 10), and the width direction is perpendicular to the direction in which the three-phase blocking portions are arranged in parallel. It is arranged in a state where it is oriented in a certain direction (width direction of the case 10). A rectangular cut A for allowing the drive shaft 28 to pass therethrough is provided at a part of the upper end of each of the insulation barriers 40A to 40D.

  The insulating barriers 40 </ b> A to 40 </ b> D are supported at the upper portions at both ends in the width direction by the upper portions of the side walls of the case body 11 via the support members 41, and at the lower portions at the respective one ends in the width direction through the support members 41. By being supported by the lower part of the side wall of the case body, the case body 11 is supported. Since the lower part of the other end in the width direction of each insulating barrier 40 is not restrained, it can be freely displaced when subjected to pressure.

  The method of supporting each part of the insulation barrier 40 is arbitrary, but in the example shown in the figure, the supported parts of the two adjacent insulation barriers 40A and 40B are supported on the side wall of the case body by the common support member 41, and adjacent to each other. The supported portions of the other two insulating barriers 40C and 40D are supported on the side wall of the case body by a common support member 41.

  The support member 41 used in the illustrated example has a strip-like base portion 41A which is arranged so as to face the longitudinal direction of the case body and welded to the side wall of the case body, and insulation corresponding to both ends of the base portion in the longitudinal direction. It consists of a U-shaped bracket integrally having a pair of arm portions 41B and 41C standing up on the barrier side, and one or a plurality of fasteners (insulating barriers corresponding to the arm portions 41B and 41C at both ends thereof) The corresponding insulation barrier is supported by fixing with screws or rivets.

  In the illustrated example, a ground-to-ground barrier 50 (see FIG. 2A) having an L-shaped cross section is provided to ensure insulation between the case 10 and the movable electrode 26 when the movable electrode 26 is displaced to the open position. ing. This ground-to-ground barrier is fixed to the cover 12 via a support tool 51. The ground-to-ground barrier 50 is disposed so as to cover the inside of the bottom wall portion 12A, the inside of the standing wall portion 12B, and the inside of the upper case side wall 11A3, and its depth direction (from the front of the drawing in FIG. 1A). The dimension in the direction toward the back is a dimension that covers the blocking portion for three phases.

  In the switch according to the present embodiment, the tongue-like connecting portions 11D and 12F are oriented substantially vertically as shown in FIGS. 1, 2, and 4A at the normal time when no accident occurs. Therefore, airtightness in the case 10 is maintained by the packing 15.

  When a ground fault or short circuit accident occurs in the case 10, the pressure in the case 10 rises abnormally due to the occurrence of an arc, so that the cover 12 moves downward as shown in FIGS. 3 and 4B. While being pushed, the connecting portions 11D and 12F are plastically deformed so as to open outward, and a gap D for gas discharge (see FIG. 4B) is formed between the outer frame portion 12E of the cover 12 and the lower end of the upper case 11. Is done.

  Therefore, the gas in the case 10 flows out through the gap D as shown by the arrows in FIGS. 3 and 4B, and the explosion of the case 10 is prevented.

  In the present embodiment, the other end in the width direction of each insulating barrier 40 (the end located at the lower right in FIGS. 2A and 3A) is not constrained and can move freely. Therefore, if a ground fault occurs in the V phase, for example, the unconstrained ends of the barriers 40A to 40D are deformed as shown in FIG. The gas is released between the phases.

  Since the barriers 40A to 40D are deformed as described above, the gas in the vicinity of each blocking portion flows smoothly to the gap D formed between the lower end of the case body 11 and the cover 12, so that the gas is locally within the case. Therefore, there is no possibility that a high pressure part having an abnormally high pressure is generated, and it is possible to prevent the member from being damaged or the cover 12 from being subjected to an impact. Therefore, it is possible to prevent the cover from coming off and fly and parts in the case from being scattered, and safety can be improved.

  When the ground-to-ground barrier 50 having an L-shaped cross section is provided as in the present embodiment, when the pressure in the case increases and the pressure release operation is performed, the ground-to-ground barrier 50 is When the four corners of the insulating barriers 40A to 40D are constrained to block a part of the gap D formed between the lower end of the cover 11 and the cover 12, the pressure in the vicinity of each blocking portion is released smoothly. However, in the present invention, the barrier between the ground is formed between the lower end of the case body 11 and the cover 12 so that the lower portion of one end in the width direction of the insulating barriers 40A to 40D is not restrained. Even when the gap D is partially closed, the pressure relief operation can be performed smoothly.

  In the above embodiment, the upper portions of both ends of each insulating barrier in the width direction are supported by the upper portions of the side walls of the case body 11, but the upper portions of both ends of each insulating barrier in the width direction are on the ceiling portion side of the case body 11. You may make it support.

  In the above embodiment, the upper and lower ends of each insulating barrier 40 in the width direction and the lower end of the width direction are supported on the case body 11 via the support member 41. However, in the above embodiment, The support member 41 that supports the lower portion of one end in the width direction of each insulating barrier 40 is omitted, and only the upper portions at both ends in the width direction of each insulating barrier 40 are supported to the case body 11 via the support member 41. You may make it do.

  If comprised in this way, since the lower part of the both ends of the width direction of each insulation barrier 40 will be put in the state which is not restrained, it can carry out more smoothly the pressure release operation | movement when an accident generate | occur | produces in the interruption | blocking part of each phase. It is possible to enhance the effect of preventing a locally abnormal high pressure part from being generated in the case.

  In the above embodiment, the support member 41 is formed in a U-shape, but the support member 41 may have a function of supporting each insulating barrier, and its structure is arbitrary.

  In the above example, the three-phase blocking portion is accommodated in the case. However, the present invention can be applied to a case where a single-phase (two) blocking portion is accommodated in the case. Of course.

11 Case Body 12 Cover 15 Packing 23 Fixed Electrode 26 Movable Electrode 40 Insulation Barrier 41 Support Member

Claims (4)

A case body having a case body having a lower end opened and a cover that is provided so as to close the opening of the case body in an airtight manner and connected to the case body by a connecting portion; A three-phase blocking portion housed therein, and deforming the connecting portion when the inside of the case becomes high in pressure, thereby creating a gap between the opening of the case body and the cover. In a switch configured to release the pressure inside,
Plate-like insulating barriers are disposed between the three-phase blocking portions housed in the case and outside the blocking portions of both end phases, respectively.
Each insulating barrier is arranged with its width direction oriented in a direction perpendicular to the direction in which the blocking portions are arranged, and an upper portion at both ends in the width direction and a lower portion at one end in the width direction are interposed through the support member. Supported by the case body ,
The switch according to claim 1, wherein the deformed portion of the insulating barrier is disposed in the vicinity of the opening when the pressure is released .
A case body having a case body having a lower end opened and a cover that is provided so as to close the opening of the case body in an airtight manner and connected to the case body by a connecting portion; A three-phase blocking portion housed therein, and deforming the connecting portion when the inside of the case becomes high in pressure, thereby creating a gap between the opening of the case body and the cover. In a switch configured to release the pressure inside,
Plate-like insulating barriers are disposed between the three-phase blocking portions housed in the case and outside the blocking portions of both end phases, respectively.
Each insulating barrier is disposed with its width direction oriented in a direction perpendicular to the direction in which the blocking portions are arranged, and only upper portions at both ends in the width direction are supported by the case body via support members ,
The switch according to claim 1, wherein the deformed portion of the insulating barrier is disposed in the vicinity of the opening when the pressure is released .
  The switch according to claim 1 or 2, wherein upper portions of both ends in the width direction of the respective insulation barriers are supported by side walls of the case body via the support members.   3. The switch according to claim 1, wherein upper portions of both ends in the width direction of each insulating barrier are supported on the ceiling portion side of the case body via the support member.

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