EP4277056A1 - Gas-insulated switching device - Google Patents
Gas-insulated switching device Download PDFInfo
- Publication number
- EP4277056A1 EP4277056A1 EP21917457.0A EP21917457A EP4277056A1 EP 4277056 A1 EP4277056 A1 EP 4277056A1 EP 21917457 A EP21917457 A EP 21917457A EP 4277056 A1 EP4277056 A1 EP 4277056A1
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- EP
- European Patent Office
- Prior art keywords
- movable
- side terminal
- electric field
- electrode
- field relaxing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 230000005684 electric field Effects 0.000 claims abstract description 58
- 230000002040 relaxant effect Effects 0.000 claims abstract description 52
- 230000000903 blocking effect Effects 0.000 claims abstract description 51
- 238000009413 insulation Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 9
- 230000000630 rising effect Effects 0.000 abstract description 4
- 239000004020 conductor Substances 0.000 description 15
- 239000000470 constituent Substances 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
- H01H33/121—Load break switches
- H01H33/122—Load break switches both breaker and sectionaliser being enclosed, e.g. in SF6-filled container
Definitions
- the present disclosure relates to a gas-insulated switchgear.
- Patent Document 1 discloses that, in a disconnector in which a fixed-side terminal and a movable-side terminal including a movable electrode rod are arranged opposite to each other, a quick acting mechanism for interrupting current is provided in the fixed-side terminal.
- the quick acting mechanism includes a shaft rod electrically connected to the fixed-side terminal, a blocking electrode disposed at a shaft rod tip for receiving an arc generated when current is interrupted, an engaging unit for engaging the shaft rod with the movable electrode rod, and an opening spring that drives the blocking electrode along with the shaft rod in a direction opposite to the movable electrode rod.
- the quick acting mechanism has such a configuration that: when a circuit between the fixed-side terminal and the movable-side terminal is closed by the movable electrode rod, the movable electrode rod and the shaft rod are engaged; and when the circuit is opened, the shaft rod is pulled by the movable electrode rod to compress the opening spring so as to store a force, the engaging unit is caused to perform separation at a predetermined position, and the opening spring is released to drive the shaft rod, whereby the blocking electrode is separated in a direction opposite to the movable electrode rod to interrupt current.
- Patent Document 1 Japanese Patent No. 519278
- Patent Document 1 in a condition in which the circuit between the fixed-side terminal and the movable-side terminal is opened, the circuit is a circuit between disconnecting electrodes, and thus needs to have withstand voltage performance higher than that between earth electrodes and that between phases. Accordingly, the distance between the fixed-side terminal and the movable-side terminal is relatively long.
- a solution to relax an electric field between terminals by storing the blocking electrode inside the fixed-side terminal is provided.
- the disconnecting electrodes are separated from each other, and thus the blocking electrode needs to be quickly driven to be stored into the fixed-side terminal in a short time.
- the blocking electrode needs to be more quickly driven.
- the present disclosure has been made to solve the above problem, and an object of the present disclosure is to provide a configuration of a gas-insulated switchgear that enables reduction in a speed for driving the blocking electrode compared to that of the conventional configuration even when an interruption involving a recovery voltage is performed.
- a gas-insulated switchgear includes: a fixed-side terminal disposed inside an airtight container with insulation gas sealed therein; a movable-side terminal that is arranged opposite to the fixed-side terminal and includes a movable electrode rod contactable to ensure electrical conduction with the fixed-side terminal; and a driving mechanism for interrupting the electrical conduction between the movable-side terminal and the fixed-side terminal.
- the fixed-side terminal includes a movable blocking electrode that is engaged with the movable electrode rod when a circuit is closed, and a movable electric field relaxing shield. When the movable electrode rod and the blocking electrode are disengaged, the electric field relaxing shield operates in conjunction with operation of the blocking electrode to store the blocking electrode at an inside of the electric field relaxing shield.
- the blocking electrode is stored in the electric field relaxing shield.
- an electric field of the blocking electrode is relaxed and a restrike due to a rising recovery voltage can be restrained, thereby enabling reduction in a speed for driving the blocking electrode.
- FIG. 1 is a sectional view of a major part of a gas-insulated switchgear according to Embodiment 1, when a disconnector is in an open-circuit condition.
- a basic function for opening and closing an electrical path is configured by a fixed-side terminal 1, a movable-side terminal 2, and a movable electrode rod 3. These components are arranged inside an airtight container with insulation gas sealed therein. Hereinafter, each component will be described in detail.
- a cylindrical conductor 11 has one end surface mechanically and electrically connected coaxially to one end of a fixed-side terminal 1.
- the other end surface is mechanically and electrically connected to a base conductor 5b.
- a mechanical connection method bolt fixing may be performed, and a contact surface may be silver plated to obtain electrical connection.
- a base conductor 5a having an outer periphery formed by a curved surface is fixed so as to cover a base conductor 5b.
- a piston 6 is mechanically and electrically connected perpendicularly to the base conductor 5b and coaxially with an opening formed in the fixed-side terminal 1.
- the piston 6 is fixed and does not move.
- bolt fixing may be performed, and a contact surface may be silver plated to obtain electrical connection.
- a cylinder 7 having a cylindrical shape is inserted in the piston 6, and a contact 9 for piston ensures electrical conduction between the cylinder 7 and the piston 6.
- the cylinder 7 slides along the piston 6, and the details of the operation will be described below.
- a projection 13 is formed or arranged at an outer circumference of an opening end portion of the cylinder 7.
- the projection 13 has an outer diameter approximately the same as an inner diameter of the cylindrical conductor 11, and thus can move on an inner circumferential surface of the cylindrical conductor 11 in the right and left directions, as the cylinder 7 moves.
- a stopper 14 has an inner diameter smaller than the outer diameter of the projection 13, and is formed at a predetermined position inside the cylinder of the cylindrical conductor 11. This predetermined position is determined according to an elastic force of an opening spring 10 or the like.
- the opening spring 10 having a helical shape is arranged along an outer circumference of the cylinder 7.
- the opening spring 10 has one end fixed to a spring holder disposed at an end portion of the projection 13 and the other end fixed to a spring holder disposed inside the cylinder on the fixed-side terminal 1 side.
- FIG. 2 is a sectional view of a major part of the blocking electrode 8.
- the blocking electrode 8 is composed of a shaft rod base end 8a as a base, a shaft rod 8b extending from the shaft rod base end 8a, a contact-pressure spring 8c arranged around the shaft rod 8b, a male-side engagement part 8d mounted to the shaft rod 8b, and an auxiliary electrode 8e slidable on the shaft rod 8b.
- the contact-pressure spring 8c is helical, is arranged around the shaft rod 8b coaxially with the male-side engagement part 8d, and has one end fixed to the shaft rod base end 8a and the other end fixed to the auxiliary electrode 8e.
- a contact end surface 8f that comes into contact with a contact end surface 12e disposed at an electric field relaxing shield base end 12a described below according to a state of the opening spring 10 described below is formed.
- One end portion of the male-side engagement part 8d is inserted into the shaft rod 8b and mounted thereto. The other end portion thereof is engaged with a female-side engagement part 3a of the movable electrode rod 3 described below when the circuit is closed.
- a distal end of the male-side engagement part 8d is positioned on the inner side from the auxiliary electrode 8e.
- the auxiliary electrode 8e has a ring shape having, at the center, a hole part through which the shaft rod 8b can penetrate, and is slidable on the shaft rod 8b in the axial direction.
- FIG. 3 is a sectional view of a major part of an electric field relaxing shield unit 12.
- the electric field relaxing shield unit 12 is composed of an electric field relaxing shield base end 12a as a base, a pillar 12b extending from the electric field relaxing shield base end 12a, a shield spring 12c arranged around the pillar 12b, and an electric field relaxing shield 12d mounted to a distal end of the pillar 12b.
- the electric field relaxing shield base end 12a has, at the center, a hole part 12g through which the cylinder 7 can penetrate. Further, when the circuit is open as in FIG. 1 , since an end portion of the electric field relaxing shield base end 12a is in contact with the cylindrical conductor 11 and an elastic force of the opening spring 10 is set greater than that of the shield spring 12c, a contact end surface 12f is engaged so as to press a contact end surface 8g formed on the shaft rod base end 8a.
- the pillar 12b penetrates the fixed-side terminal 1 and has the distal end to which the electric field relaxing shield 12d is mounted.
- the shield spring 12c has one end connected to the pillar 12b and the other end connected to a recess formed in an outer part of the fixed-side terminal 1.
- the electric field relaxing shield 12d has a surface formed by a smooth curved surface so as to relax concentration of an electric field.
- a distal end of the electric field relaxing shield 12d is located closer to the movable-side terminal 2 side than a distal end of the auxiliary electrode 8e, so that the blocking electrode 8 is stored at an inside of the electric field relaxing shield 12d.
- the movable electrode rod 3 mounted to the movable-side terminal 2 is formed into a hollow shape, and the female-side engagement part 3a is provided in this hollow part.
- the female-side engagement part 3a has a contact 4 for movable electrode rod at an outer circumferential surface thereof and is electrically connected to the movable-side terminal 2.
- the movable electrode rod 3 is configured to be slidable inside a through hole 2a penetrating the movable-side terminal 2, in the right and left directions of the drawing sheet of FIG. 1 . In such a configuration, as described below in FIG.
- the movable electrode rod 3 is moved to an inside of the fixed-side terminal 1 when the circuit is closed, the female-side engagement part 3a is engaged with the male-side engagement part 8d on the fixed-side terminal 1 side, and the movable-side terminal 2 and the fixed-side terminal 1 are electrically connected, so that an electrical path is formed.
- the opening spring 10 is set to have an elastic force stronger than that of the shield spring 12c in a compressed state when the circuit is open as shown in FIG. 1 . Accordingly, a force in the left direction of the drawing sheet is generated to the shaft rod base end 8a mechanically connected to the cylinder 7 that receives the elastic force of the opening spring 10, and thus the blocking electrode 8 is maintained in the vicinity of an end surface of the cylindrical conductor 11 together with the electric field relaxing shield unit 12.
- the shield spring 12c is in a compressed state.
- the piston 6 is inserted to the deepest position of the cylinder 7, the auxiliary electrode 8e is positioned at a distal end of the shaft rod 8b, and the male-side engagement part 8d is provided inside the auxiliary electrode 8e.
- FIG. 4 shows a closed-circuit condition in which a driving unit not shown drives the movable electrode rod 3 to move from the through hole 2a of the movable-side terminal 2 toward the fixed-side terminal 1 in the left direction of the drawing sheet, whereby the movable electrode rod 3 and the auxiliary electrode 8e are abutted on each other.
- the auxiliary electrode 8e is pushed by the movable electrode rod 3, is pushed in a left side of the drawing sheet, and moves on the shaft rod 8b.
- the contact-pressure spring 8c having one end fixed to the auxiliary electrode 8e is also pushed in the left side of the drawing sheet along with the auxiliary electrode 8e and compressed.
- the male-side engagement part 8d protrudes from the auxiliary electrode 8e and enters the hollow part of the movable electrode rod 3.
- An outer diameter of the male-side engagement part 8d is smaller than an inner diameter of the female-side engagement part, and thus the male-side engagement part 8d smoothly enters the inside of the movable electrode rod 3.
- a main circuit current flows through the movable-side terminal 2, the movable electrode rod 3, and the fixed-side terminal 1.
- the movable electrode rod 3 is moved to the movable-side terminal 2 side in the right direction of the drawing sheet, while the closed-circuit condition in FIG. 4 is returned to the open-circuit condition.
- the blocking electrode 8 is also moved to the movable-side terminal 2 side while the male-side engagement part 8d and the female-side engagement part 3a are maintained to be engaged with each other.
- the movable electrode rod 3 and the blocking electrode 8 are in contact with each other and are maintained to be electrically connected with each other.
- FIG. 6 shows a state immediately before the movable electrode rod 3 is about to return to the movable-side terminal 2 side along with the blocking electrode 8 and returned to an open-circuit predetermined position, that is, immediately before an engaged part is separated.
- FIG. 6 shows the final position in the open-circuit operation in a state in which the male-side engagement part 8d and the female-side engagement part 3a are engaged, and the stopper 14 and the projection 13 are in contact with each other. At this time, the opening spring 10 is in the most compressed state. Even if the movable electrode rod 3 is made to further move to the right side of the drawing sheet, the cylinder 7 is obstructed by the stopper 14 and cannot be moved to the right side.
- the stopper 14 and the projection 13 function as release means, so that the male-side engagement part 8d and the female-side engagement part 3a are no longer able to hold the engagement, and thus start to release the engagement thereof.
- the main circuit current path is as follows: the movable-side terminal 2; the movable electrode rod 3; the auxiliary electrode 8e; the male-side engagement part 8d; the shaft rod 8b; the cylinder 7; the piston 6; the base conductors 5b, 5a; the cylindrical conductor 11; and the fixed-side terminal 1.
- FIG. 7 shows a state immediately after the engaged part has been separated.
- the male-side engagement part 8d and the female-side engagement part 3a are disengaged, whereby the opening spring 10 is released and starts extending.
- the male-side engagement part 8d, the shaft rod 8b, the contact-pressure spring 8c, and the cylinder 7 swiftly start to move to the left side of the drawing sheet.
- the auxiliary electrode 8e to which a contact pressure to the movable electrode rod 3 side is applied by the contact-pressure spring 8c is in contact with the movable electrode rod 3 and maintains electrical connection, until the contact-pressure spring 8c extends to its end.
- the electric field relaxing shield unit 12 does not move from a position shown in FIG. 6 and is in a state of being closest to the movable-side terminal 2.
- the contact-pressure spring 8c extends to its end, the movable electrode rod 3 and the auxiliary electrode 8e start to separate. In this way, the use of the contact-pressure spring 8c allows the auxiliary electrode 8e and the movable electrode rod 3 to maintain electrical connection for a certain time period even immediately after the engaged part has been released and separated, thereby delaying a recovery voltage rising timing and increasing an initial separating speed of the blocking electrode.
- the opening spring 10 is released, the blocking electrode 8 that includes the auxiliary electrode 8e separated from the movable electrode rod 3 moves to the inner side of the electric field relaxing shield 12d, and the electric field relaxing shield base end 12a is in contact with the shaft rod base end 8a.
- the recovery voltage rises because the auxiliary electrode 8e has been separated from the movable electrode rod 3, the blocking electrode 8 has already been stored at the inside of the electric field relaxing shield 12d.
- a surface of the electric field relaxing shield 12d on the fixed-side terminal 1 side faces a surface on the movable-side terminal 2 side, that is, two smooth metal surfaces are facing each other.
- the electric field is suppressed from becoming stronger, and a possibility of occurrence of a restrike can be decreased.
- the opening spring 10 is further released, and the shaft rod base end 8a pushes the electric field relaxing shield base end 12a up to the end surface of the cylindrical conductor 11, thereby returning to the open-circuit condition shown in FIG. 1 .
- the blocking electrode 8 is stored at the inside of the electric field relaxing shield 12d that operates to a predetermined position.
- the electric field of the blocking electrode 8 is relaxed and a restrike due to a rising recovery voltage can be restrained, thereby enabling reduction in a speed for driving the blocking electrode 8. Since the speed for driving the blocking electrode 8 is lowered, an elastic force of the opening spring 10 can be lowered and the lowered elastic force of the opening spring lowers an impact due to the operation.
- the mechanical strength of each component of the disconnector can be designed to be relatively lower, and thus simplification and size reduction of the configuration can be expected compared to the conventional configuration.
- the shaft rod base end 8a of the blocking electrode 8 in FIG. 2 and the electric field relaxing shield base end 12a of the electric field relaxing shield unit 12 in FIG. 3 are arranged such that two cylindrical bases each having a bottom portion are partially stacked in the open-circuit condition as shown in FIG. 1 . That is, with reference to FIG. 2 and FIG.
- the contact end surface 8f formed on the shaft rod base end 8a and the contact end surface 12e formed on the electric field relaxing shield base end 12a come into contact with each other at surfaces parallel to each moving direction
- the contact end surface 8g formed on a bottom portion of the shaft rod base end 8a and the contact end surface 12f formed on a bottom portion of the electric field relaxing shield base end 12a come into contact with each other at surfaces perpendicular to each moving direction.
- the elastic forces of the opening spring 10 and the shield spring 12c are applied on only the contact end surface 8g and the contact end surface 12f, and thus, repeating the open-circuit condition and the closed-circuit condition may cause damage.
- a shaft rod base end 8a and an electric field relaxing shield base end are caused to come into contact with each other at inclined surfaces thereof such that two truncated cone shaped bases are stacked, whereby the elastic force is dispersed in two directions.
- an inclined contact surface 8h formed on the shaft rod base end 8a and an inclined contact surface 12h formed on an electric field relaxing shield base end 12a are engaged, whereby the elastic force can be dispersed in a direction parallel to and a direction perpendicular to each moving direction.
- such an inclined surface is formed by cutting a part of the vertical surface of the conventional shaft rod base end 8a, thus leading to the shaft rod base end 8a having a light weight and also contributing to improving the speed for driving the blocking electrode 8.
- the contact part formed in an inclined shape allows the elastic forces of the opening spring and the shield spring to be dispersed in a movement direction of the spring and a direction perpendicular to the movement when the surfaces mechanically come into contact with each other after the opening spring has been released, and an improved speed for driving the blocking electrode can be expected by reducing the material.
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- Arc-Extinguishing Devices That Are Switches (AREA)
- Processing Of Terminals (AREA)
- Transformer Cooling (AREA)
- Sampling And Sample Adjustment (AREA)
- Circuit Breakers (AREA)
Abstract
Description
- The present disclosure relates to a gas-insulated switchgear.
- A disconnector stored in a gas-insulated switchgear does not have a function of interrupting current in most cases. For example,
Patent Document 1 discloses that, in a disconnector in which a fixed-side terminal and a movable-side terminal including a movable electrode rod are arranged opposite to each other, a quick acting mechanism for interrupting current is provided in the fixed-side terminal. - The quick acting mechanism includes a shaft rod electrically connected to the fixed-side terminal, a blocking electrode disposed at a shaft rod tip for receiving an arc generated when current is interrupted, an engaging unit for engaging the shaft rod with the movable electrode rod, and an opening spring that drives the blocking electrode along with the shaft rod in a direction opposite to the movable electrode rod.
- The quick acting mechanism has such a configuration that: when a circuit between the fixed-side terminal and the movable-side terminal is closed by the movable electrode rod, the movable electrode rod and the shaft rod are engaged; and when the circuit is opened, the shaft rod is pulled by the movable electrode rod to compress the opening spring so as to store a force, the engaging unit is caused to perform separation at a predetermined position, and the opening spring is released to drive the shaft rod, whereby the blocking electrode is separated in a direction opposite to the movable electrode rod to interrupt current.
- Patent Document 1:
Japanese Patent No. 519278 - In
Patent Document 1, in a condition in which the circuit between the fixed-side terminal and the movable-side terminal is opened, the circuit is a circuit between disconnecting electrodes, and thus needs to have withstand voltage performance higher than that between earth electrodes and that between phases. Accordingly, the distance between the fixed-side terminal and the movable-side terminal is relatively long. - In addition, in interruption of current, in order to restrain a restrike of arc due to a recovery voltage generated after current interruption, the withstand voltage performance required for the recovery voltage that rises immediately after the movable electrode rod has been separated from the blocking electrode needs to be ensured.
- As one of measures to ensure the withstand voltage performance, a solution to relax an electric field between terminals by storing the blocking electrode inside the fixed-side terminal is provided. However, as described above, the disconnecting electrodes are separated from each other, and thus the blocking electrode needs to be quickly driven to be stored into the fixed-side terminal in a short time. Particularly, when interruption involving a relatively high recovery voltage is performed as in current interruption during cable charging, the blocking electrode needs to be more quickly driven.
- The present disclosure has been made to solve the above problem, and an object of the present disclosure is to provide a configuration of a gas-insulated switchgear that enables reduction in a speed for driving the blocking electrode compared to that of the conventional configuration even when an interruption involving a recovery voltage is performed.
- A gas-insulated switchgear according to the present disclosure includes: a fixed-side terminal disposed inside an airtight container with insulation gas sealed therein; a movable-side terminal that is arranged opposite to the fixed-side terminal and includes a movable electrode rod contactable to ensure electrical conduction with the fixed-side terminal; and a driving mechanism for interrupting the electrical conduction between the movable-side terminal and the fixed-side terminal. The fixed-side terminal includes a movable blocking electrode that is engaged with the movable electrode rod when a circuit is closed, and a movable electric field relaxing shield. When the movable electrode rod and the blocking electrode are disengaged, the electric field relaxing shield operates in conjunction with operation of the blocking electrode to store the blocking electrode at an inside of the electric field relaxing shield.
- In the gas-insulated switchgear according to the present disclosure, the blocking electrode is stored in the electric field relaxing shield. Thus, when the movable-side terminal and the fixed-side terminal are relatively close to each other, an electric field of the blocking electrode is relaxed and a restrike due to a rising recovery voltage can be restrained, thereby enabling reduction in a speed for driving the blocking electrode.
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- [
FIG. 1] FIG. 1 is a sectional view of a major part of a gas-insulated switchgear according toEmbodiment 1, when a disconnector is in an open-circuit condition. - [
FIG. 2] FIG. 2 is a sectional view of a major part of a blocking electrode mounted to the disconnector of the gas-insulated switchgear according toEmbodiment 1. - [
FIG. 3] FIG. 3 is a sectional view of a major part of an electric field relaxing shield unit mounted to the disconnector of the gas-insulated switchgear according toEmbodiment 1. - [
FIG. 4] FIG. 4 is a sectional view of a major part of the gas-insulated switchgear according toEmbodiment 1, when the disconnector is in a closed-circuit condition. - [
FIG. 5] FIG. 5 is a sectional view of a major part of the gas-insulated switchgear according toEmbodiment 1, immediately after an engaged part has been engaged in the middle of switching from the closed-circuit condition of the disconnector to the open-circuit condition thereof. - [
FIG. 6] FIG. 6 is a sectional view of a major part of the gas-insulated switchgear according toEmbodiment 1, immediately before the engaged part of the disconnector is released and separated. - [
FIG. 7] FIG. 7 is a sectional view of a major part of the gas-insulated switchgear according toEmbodiment 1, immediately after the engaged part of the disconnector has been released and separated. - [
FIG. 8] FIG. 8 is a sectional view of a major part of the gas-insulated switchgear according toEmbodiment 1, immediately after the blocking electrode mounted to the disconnector has been stored at an inside of an electric field relaxing shield. - [
FIG. 9] FIG. 9 is a sectional view of a major part of a shaft rod base end and an electric field relaxing shield base end mounted to a disconnector of a gas-insulated switchgear according toEmbodiment 2. - Hereinafter, a preferred embodiment of a gas-insulated switchgear according to the present disclosure will be described with reference to the drawings. In the drawings, the same reference characters denote the same or corresponding parts, and detailed description thereof will be omitted. Similarly, also in the subsequent embodiment, redundant description of the components denoted by the same reference characters is omitted.
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FIG. 1 is a sectional view of a major part of a gas-insulated switchgear according toEmbodiment 1, when a disconnector is in an open-circuit condition. A basic function for opening and closing an electrical path is configured by a fixed-side terminal 1, a movable-side terminal 2, and amovable electrode rod 3. These components are arranged inside an airtight container with insulation gas sealed therein. Hereinafter, each component will be described in detail. - A
cylindrical conductor 11 has one end surface mechanically and electrically connected coaxially to one end of a fixed-side terminal 1. In addition, the other end surface is mechanically and electrically connected to abase conductor 5b. As a mechanical connection method, bolt fixing may be performed, and a contact surface may be silver plated to obtain electrical connection. In addition, abase conductor 5a having an outer periphery formed by a curved surface is fixed so as to cover abase conductor 5b. - A
piston 6 is mechanically and electrically connected perpendicularly to thebase conductor 5b and coaxially with an opening formed in the fixed-side terminal 1. Thus, needless to say, thepiston 6 is fixed and does not move. As a mechanical connection method, bolt fixing may be performed, and a contact surface may be silver plated to obtain electrical connection. - A
cylinder 7 having a cylindrical shape is inserted in thepiston 6, and acontact 9 for piston ensures electrical conduction between thecylinder 7 and thepiston 6. Thecylinder 7 slides along thepiston 6, and the details of the operation will be described below. - A
projection 13 is formed or arranged at an outer circumference of an opening end portion of thecylinder 7. Theprojection 13 has an outer diameter approximately the same as an inner diameter of thecylindrical conductor 11, and thus can move on an inner circumferential surface of thecylindrical conductor 11 in the right and left directions, as thecylinder 7 moves. - A
stopper 14 has an inner diameter smaller than the outer diameter of theprojection 13, and is formed at a predetermined position inside the cylinder of thecylindrical conductor 11. This predetermined position is determined according to an elastic force of anopening spring 10 or the like. In addition, theopening spring 10 having a helical shape is arranged along an outer circumference of thecylinder 7. Theopening spring 10 has one end fixed to a spring holder disposed at an end portion of theprojection 13 and the other end fixed to a spring holder disposed inside the cylinder on the fixed-side terminal 1 side. - A rod-
like blocking electrode 8 mechanically and electrically connected coaxially to thecylinder 7 is connected at a distal end on the fixed-side terminal 1 side of thecylinder 7.FIG. 2 is a sectional view of a major part of the blockingelectrode 8. The blockingelectrode 8 is composed of a shaftrod base end 8a as a base, ashaft rod 8b extending from the shaftrod base end 8a, a contact-pressure spring 8c arranged around theshaft rod 8b, a male-side engagement part 8d mounted to theshaft rod 8b, and anauxiliary electrode 8e slidable on theshaft rod 8b. The contact-pressure spring 8c is helical, is arranged around theshaft rod 8b coaxially with the male-side engagement part 8d, and has one end fixed to the shaftrod base end 8a and the other end fixed to theauxiliary electrode 8e. On the shaftrod base end 8a, acontact end surface 8f that comes into contact with acontact end surface 12e disposed at an electric field relaxingshield base end 12a described below according to a state of the openingspring 10 described below is formed. - One end portion of the male-
side engagement part 8d is inserted into theshaft rod 8b and mounted thereto. The other end portion thereof is engaged with a female-side engagement part 3a of themovable electrode rod 3 described below when the circuit is closed. In addition, when the contact-pressure spring 8c is in a released state, a distal end of the male-side engagement part 8d is positioned on the inner side from theauxiliary electrode 8e. - The
auxiliary electrode 8e has a ring shape having, at the center, a hole part through which theshaft rod 8b can penetrate, and is slidable on theshaft rod 8b in the axial direction. With such a configuration, when themovable electrode rod 3 described below is moved from right to left of the drawing sheet ofFIG. 1 to come into contact with theauxiliary electrode 8e and theauxiliary electrode 8e is further pressed, the contact-pressure spring 8c having one end mounted to theauxiliary electrode 8e is contracted to move theauxiliary electrode 8e to the shaft rodbase end 8a side, whereby the male-side engagement part 8d protrudes from an opening of theauxiliary electrode 8e to be engaged with the female-side engagement part 3a (seeFIG. 4 described below). When the contact-pressure spring 8c is contracted, a load for abutting theauxiliary electrode 8e on themovable electrode rod 3 is applied, whereby theauxiliary electrode 8e serves as conduction from themovable electrode rod 3 to the blockingelectrode 8. -
FIG. 3 is a sectional view of a major part of an electric field relaxingshield unit 12. The electric field relaxingshield unit 12 is composed of an electric field relaxing shieldbase end 12a as a base, apillar 12b extending from the electric field relaxing shieldbase end 12a, ashield spring 12c arranged around thepillar 12b, and an electricfield relaxing shield 12d mounted to a distal end of thepillar 12b. - The electric field relaxing shield
base end 12a has, at the center, ahole part 12g through which thecylinder 7 can penetrate. Further, when the circuit is open as inFIG. 1 , since an end portion of the electric field relaxing shieldbase end 12a is in contact with thecylindrical conductor 11 and an elastic force of theopening spring 10 is set greater than that of theshield spring 12c, acontact end surface 12f is engaged so as to press acontact end surface 8g formed on the shaft rodbase end 8a. Thepillar 12b penetrates the fixed-side terminal 1 and has the distal end to which the electricfield relaxing shield 12d is mounted. Theshield spring 12c has one end connected to thepillar 12b and the other end connected to a recess formed in an outer part of the fixed-side terminal 1. The electricfield relaxing shield 12d has a surface formed by a smooth curved surface so as to relax concentration of an electric field. When the circuit is open as shown inFIG. 1 and after disengagement as shown inFIG. 8 , a distal end of the electricfield relaxing shield 12d is located closer to the movable-side terminal 2 side than a distal end of theauxiliary electrode 8e, so that the blockingelectrode 8 is stored at an inside of the electricfield relaxing shield 12d. - Next, the movable-
side terminal 2 inFIG. 1 will be described. Themovable electrode rod 3 mounted to the movable-side terminal 2 is formed into a hollow shape, and the female-side engagement part 3a is provided in this hollow part. The female-side engagement part 3a has acontact 4 for movable electrode rod at an outer circumferential surface thereof and is electrically connected to the movable-side terminal 2. Themovable electrode rod 3 is configured to be slidable inside a throughhole 2a penetrating the movable-side terminal 2, in the right and left directions of the drawing sheet ofFIG. 1 . In such a configuration, as described below inFIG. 4 , themovable electrode rod 3 is moved to an inside of the fixed-side terminal 1 when the circuit is closed, the female-side engagement part 3a is engaged with the male-side engagement part 8d on the fixed-side terminal 1 side, and the movable-side terminal 2 and the fixed-side terminal 1 are electrically connected, so that an electrical path is formed. - Operation of the disconnector of the gas-insulated switchgear configured as described above will be described.
- The
opening spring 10 is set to have an elastic force stronger than that of theshield spring 12c in a compressed state when the circuit is open as shown inFIG. 1 . Accordingly, a force in the left direction of the drawing sheet is generated to the shaft rodbase end 8a mechanically connected to thecylinder 7 that receives the elastic force of theopening spring 10, and thus the blockingelectrode 8 is maintained in the vicinity of an end surface of thecylindrical conductor 11 together with the electric field relaxingshield unit 12. Theshield spring 12c is in a compressed state. Thepiston 6 is inserted to the deepest position of thecylinder 7, theauxiliary electrode 8e is positioned at a distal end of theshaft rod 8b, and the male-side engagement part 8d is provided inside theauxiliary electrode 8e. -
FIG. 4 shows a closed-circuit condition in which a driving unit not shown drives themovable electrode rod 3 to move from the throughhole 2a of the movable-side terminal 2 toward the fixed-side terminal 1 in the left direction of the drawing sheet, whereby themovable electrode rod 3 and theauxiliary electrode 8e are abutted on each other. In this condition, theauxiliary electrode 8e is pushed by themovable electrode rod 3, is pushed in a left side of the drawing sheet, and moves on theshaft rod 8b. Accordingly, the contact-pressure spring 8c having one end fixed to theauxiliary electrode 8e is also pushed in the left side of the drawing sheet along with theauxiliary electrode 8e and compressed. At this time, the male-side engagement part 8d protrudes from theauxiliary electrode 8e and enters the hollow part of themovable electrode rod 3. An outer diameter of the male-side engagement part 8d is smaller than an inner diameter of the female-side engagement part, and thus the male-side engagement part 8d smoothly enters the inside of themovable electrode rod 3. In this closed-circuit condition, a main circuit current flows through the movable-side terminal 2, themovable electrode rod 3, and the fixed-side terminal 1. - Next, open-circuit operation will be described. In
FIG. 5 , themovable electrode rod 3 is moved to the movable-side terminal 2 side in the right direction of the drawing sheet, while the closed-circuit condition inFIG. 4 is returned to the open-circuit condition. Until themovable electrode rod 3 has been moved to the movable-side terminal 2 side, the blockingelectrode 8 is also moved to the movable-side terminal 2 side while the male-side engagement part 8d and the female-side engagement part 3a are maintained to be engaged with each other. In addition, themovable electrode rod 3 and the blockingelectrode 8 are in contact with each other and are maintained to be electrically connected with each other. In such a state, as themovable electrode rod 3 and the blockingelectrode 8 are moved from a state inFIG. 5 to a state inFIG. 6 , that is, to the movable-side terminal 2 side, a series of components, such as theshaft rod 8b, theauxiliary electrode 8e, the contact-pressure spring 8c, andcylinder 7, which are fixed to the male-side engagement part 8d are also moved to a right side of the drawing sheet along with themovable electrode rod 3 and the female-side engagement part 3a. As thecylinder 7 moves, theopening spring 10 is compressed so as to store a force. In addition, when the blockingelectrode 8 is moved, the electric field relaxing shieldbase end 12a is released from a force received from the shaft rodbase end 8a. Thus, theshield spring 12c is released, and the electric field relaxingshield unit 12 is moved to the movable-side terminal 2 side. -
FIG. 6 shows a state immediately before themovable electrode rod 3 is about to return to the movable-side terminal 2 side along with the blockingelectrode 8 and returned to an open-circuit predetermined position, that is, immediately before an engaged part is separated.FIG. 6 shows the final position in the open-circuit operation in a state in which the male-side engagement part 8d and the female-side engagement part 3a are engaged, and thestopper 14 and theprojection 13 are in contact with each other. At this time, theopening spring 10 is in the most compressed state. Even if themovable electrode rod 3 is made to further move to the right side of the drawing sheet, thecylinder 7 is obstructed by thestopper 14 and cannot be moved to the right side. Thestopper 14 and theprojection 13 function as release means, so that the male-side engagement part 8d and the female-side engagement part 3a are no longer able to hold the engagement, and thus start to release the engagement thereof. - In a state of
FIG. 6 , the main circuit current path is as follows: the movable-side terminal 2; themovable electrode rod 3; theauxiliary electrode 8e; the male-side engagement part 8d; theshaft rod 8b; thecylinder 7; thepiston 6; thebase conductors cylindrical conductor 11; and the fixed-side terminal 1. -
FIG. 7 shows a state immediately after the engaged part has been separated. The male-side engagement part 8d and the female-side engagement part 3a are disengaged, whereby theopening spring 10 is released and starts extending. The male-side engagement part 8d, theshaft rod 8b, the contact-pressure spring 8c, and thecylinder 7 swiftly start to move to the left side of the drawing sheet. However, theauxiliary electrode 8e to which a contact pressure to themovable electrode rod 3 side is applied by the contact-pressure spring 8c is in contact with themovable electrode rod 3 and maintains electrical connection, until the contact-pressure spring 8c extends to its end. In addition, since the electric field relaxing shieldbase end 12a and the shaft rodbase end 8a remain separated, the electric field relaxingshield unit 12 does not move from a position shown inFIG. 6 and is in a state of being closest to the movable-side terminal 2. When the contact-pressure spring 8c extends to its end, themovable electrode rod 3 and theauxiliary electrode 8e start to separate. In this way, the use of the contact-pressure spring 8c allows theauxiliary electrode 8e and themovable electrode rod 3 to maintain electrical connection for a certain time period even immediately after the engaged part has been released and separated, thereby delaying a recovery voltage rising timing and increasing an initial separating speed of the blocking electrode. - In
FIG. 8 , theopening spring 10 is released, the blockingelectrode 8 that includes theauxiliary electrode 8e separated from themovable electrode rod 3 moves to the inner side of the electricfield relaxing shield 12d, and the electric field relaxing shieldbase end 12a is in contact with the shaft rodbase end 8a. Although the recovery voltage rises because theauxiliary electrode 8e has been separated from themovable electrode rod 3, the blockingelectrode 8 has already been stored at the inside of the electricfield relaxing shield 12d. In such arrangement, a surface of the electricfield relaxing shield 12d on the fixed-side terminal 1 side faces a surface on the movable-side terminal 2 side, that is, two smooth metal surfaces are facing each other. Thus, the electric field is suppressed from becoming stronger, and a possibility of occurrence of a restrike can be decreased. Subsequently, theopening spring 10 is further released, and the shaft rodbase end 8a pushes the electric field relaxing shieldbase end 12a up to the end surface of thecylindrical conductor 11, thereby returning to the open-circuit condition shown inFIG. 1 . - According to the present embodiment as described above, the blocking
electrode 8 is stored at the inside of the electricfield relaxing shield 12d that operates to a predetermined position. Thus, even when the fixed-side terminal 1 and the movable-side terminal 2 are relatively close to each other, the electric field of the blockingelectrode 8 is relaxed and a restrike due to a rising recovery voltage can be restrained, thereby enabling reduction in a speed for driving the blockingelectrode 8. Since the speed for driving the blockingelectrode 8 is lowered, an elastic force of theopening spring 10 can be lowered and the lowered elastic force of the opening spring lowers an impact due to the operation. When the impact during operation is lowered, the mechanical strength of each component of the disconnector can be designed to be relatively lower, and thus simplification and size reduction of the configuration can be expected compared to the conventional configuration. - The shaft rod
base end 8a of the blockingelectrode 8 inFIG. 2 and the electric field relaxing shieldbase end 12a of the electric field relaxingshield unit 12 inFIG. 3 are arranged such that two cylindrical bases each having a bottom portion are partially stacked in the open-circuit condition as shown inFIG. 1 . That is, with reference toFIG. 2 and FIG. 3 , thecontact end surface 8f formed on the shaft rodbase end 8a and thecontact end surface 12e formed on the electric field relaxing shieldbase end 12a come into contact with each other at surfaces parallel to each moving direction, and thecontact end surface 8g formed on a bottom portion of the shaft rodbase end 8a and thecontact end surface 12f formed on a bottom portion of the electric field relaxing shieldbase end 12a come into contact with each other at surfaces perpendicular to each moving direction. In this case, the elastic forces of theopening spring 10 and theshield spring 12c are applied on only thecontact end surface 8g and thecontact end surface 12f, and thus, repeating the open-circuit condition and the closed-circuit condition may cause damage. - Meanwhile, a shaft rod
base end 8a and an electric field relaxing shield base end are caused to come into contact with each other at inclined surfaces thereof such that two truncated cone shaped bases are stacked, whereby the elastic force is dispersed in two directions. Specifically, as shown inFIG. 9 , aninclined contact surface 8h formed on the shaft rodbase end 8a and aninclined contact surface 12h formed on an electric field relaxing shieldbase end 12a are engaged, whereby the elastic force can be dispersed in a direction parallel to and a direction perpendicular to each moving direction. For example, such an inclined surface is formed by cutting a part of the vertical surface of the conventional shaft rodbase end 8a, thus leading to the shaft rodbase end 8a having a light weight and also contributing to improving the speed for driving the blockingelectrode 8. - As described above, the contact part formed in an inclined shape allows the elastic forces of the opening spring and the shield spring to be dispersed in a movement direction of the spring and a direction perpendicular to the movement when the surfaces mechanically come into contact with each other after the opening spring has been released, and an improved speed for driving the blocking electrode can be expected by reducing the material.
- Although the disclosure is described above in terms of various exemplary embodiments and implementations, it should be understood that the various features, aspects, and functionality described in one or more of the individual embodiments are not limited in their applicability to the particular embodiment with which they are described, but instead can be applied, alone or in various combinations to one or more of the embodiments of the disclosure.
- It is therefore understood that numerous modifications which have not been exemplified can be devised without departing from the scope of the present disclosure. For example, at least one of the constituent components may be modified, added, or eliminated. At least one of the constituent components mentioned in at least one of the preferred embodiments may be selected and combined with the constituent components mentioned in another preferred embodiment.
-
- 1
- fixed-side terminal
- 2
- movable-side terminal
- 3
- movable electrode rod
- 3a
- female-side engagement part
- 4
- contact for movable electrode rod
- 5a, 5b
- base conductor
- 6
- piston
- 7
- cylinder
- 8
- blocking electrode
- 8a
- shaft rod base end
- 8b
- shaft rod
- 8c
- contact-pressure spring
- 8d
- male-side engagement part
- 8e
- auxiliary electrode
- 8f, 8g
- contact end surface
- 8h
- inclined contact surface
- 9
- contact for piston
- 10
- opening spring
- 11
- cylindrical conductor
- 12
- electric field relaxing shield unit
- 12a
- electric field relaxing shield base end
- 12b
- pillar
- 12c
- shield spring
- 12d
- electric field relaxing shield
- 12e, 12f
- contact end surface
- 12g
- hole part
- 12h
- inclined contact surface
Claims (5)
- A gas-insulated switchgear comprising:a fixed-side terminal disposed inside an airtight container with insulation gas sealed therein;a movable-side terminal that is arranged opposite to the fixed-side terminal and includes a movable electrode rod contactable to ensure electrical conduction with the fixed-side terminal; anda driving mechanism for interrupting the electrical conduction between the movable-side terminal and the fixed-side terminal, whereinthe fixed-side terminal includes a movable blocking electrode that is engaged with the movable electrode rod when a circuit is closed, and a movable electric field relaxing shield, andwhen the movable electrode rod and the blocking electrode are disengaged, the electric field relaxing shield operates in conjunction with operation of the blocking electrode to store the blocking electrode at an inside of the electric field relaxing shield.
- The gas-insulated switchgear according to claim 1, wherein, when the movable electrode rod and the blocking electrode are disengaged, the electric field relaxing shield moves toward the movable-side terminal.
- The gas-insulated switchgear according to claim 2, wherein, after the blocking electrode is stored at the inside of the electric field relaxing shield, the blocking electrode and the electric field relaxing shield move toward the fixed-side terminal.
- The gas-insulated switchgear according to any one of claims 1 to 3, wherein
the blocking electrode includesan auxiliary electrode that comes into contact with an end portion of the movable electrode rod when the circuit is closed,a male-side engagement part that is engaged with a female-side engagement part in the movable electrode rod, anda contact-pressure spring that energizes the auxiliary electrode so as to maintain contact with the movable electrode rod end portion for a certain time period even if the female-side engagement part and the male-side engagement part are separated, when the movable electrode rod and the blocking electrode are disengaged. - The gas-insulated switchgear according to any one of claims 1 to 4, whereina shaft rod base end serving as a base for the blocking electrode and an electric field relaxing shield base end serving as a base for the electric field relaxing shield each include a wall surface having an inclined surface, andwhen the shaft rod base end is engaged with the electric field relaxing shield base end, the inclined surfaces are in contact with each other.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2021/000290 WO2022149230A1 (en) | 2021-01-07 | 2021-01-07 | Gas-insulated switching device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP4277056A1 true EP4277056A1 (en) | 2023-11-15 |
EP4277056A4 EP4277056A4 (en) | 2024-02-14 |
Family
ID=81259458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21917457.0A Pending EP4277056A4 (en) | 2021-01-07 | 2021-01-07 | Gas-insulated switching device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4277056A4 (en) |
JP (1) | JP7051011B1 (en) |
TW (1) | TWI797809B (en) |
WO (1) | WO2022149230A1 (en) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS519278B1 (en) | 1968-01-25 | 1976-03-25 | ||
JPH01104626U (en) * | 1988-01-05 | 1989-07-14 | ||
JP5179278B2 (en) * | 2008-07-23 | 2013-04-10 | 三菱電機株式会社 | Switch |
JP5419606B2 (en) * | 2009-09-15 | 2014-02-19 | 三菱電機株式会社 | Gas insulated switchgear |
JP5210367B2 (en) * | 2010-10-27 | 2013-06-12 | フジパックシステム株式会社 | Method for producing molded product using wood mold |
JP2016100204A (en) * | 2014-11-21 | 2016-05-30 | 株式会社東芝 | Disconnector |
JP2016208809A (en) * | 2015-04-23 | 2016-12-08 | 株式会社日立製作所 | Switch gear |
JP2017158397A (en) * | 2016-03-04 | 2017-09-07 | 三菱電機株式会社 | Gas insulation switching apparatus |
-
2021
- 2021-01-07 WO PCT/JP2021/000290 patent/WO2022149230A1/en unknown
- 2021-01-07 JP JP2021525578A patent/JP7051011B1/en active Active
- 2021-01-07 EP EP21917457.0A patent/EP4277056A4/en active Pending
- 2021-11-03 TW TW110140874A patent/TWI797809B/en active
Also Published As
Publication number | Publication date |
---|---|
TW202228350A (en) | 2022-07-16 |
WO2022149230A1 (en) | 2022-07-14 |
TWI797809B (en) | 2023-04-01 |
JP7051011B1 (en) | 2022-04-08 |
EP4277056A4 (en) | 2024-02-14 |
JPWO2022149230A1 (en) | 2022-07-14 |
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