CN117716460A - Gas-insulated switchgear - Google Patents
Gas-insulated switchgear Download PDFInfo
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- CN117716460A CN117716460A CN202280051088.2A CN202280051088A CN117716460A CN 117716460 A CN117716460 A CN 117716460A CN 202280051088 A CN202280051088 A CN 202280051088A CN 117716460 A CN117716460 A CN 117716460A
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- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 description 9
- 230000005684 electric field Effects 0.000 description 6
- 238000005339 levitation Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 5
- 239000003973 paint Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 101150012763 endA gene Proteins 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 230000000737 periodic effect Effects 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
Classifications
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- 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
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention provides a gas-insulated switchgear capable of suppressing voltage increase applied between a contact electrode on a voltage applying part side and an arc shield by increasing the potential of the arc shield of a vacuum circuit breaker. In a gas-insulated switchgear configured to support a vacuum circuit breaker in an insulated state in a grounded container, an arc shield voltage adjustment conductor (23) made of a conductive material is provided, and is configured such that one end is electrically connected to a high-voltage conductor (12C) on the power supply side of the vacuum circuit breaker, and the other end is located in the vicinity of the vacuum circuit breaker (11) with a predetermined spatial distance (D) therebetween.
Description
Technical Field
The present invention relates to a gas-insulated switchgear used in a transformer substation, a switchgear, and the like, and more particularly, to a gas-insulated switchgear using a vacuum circuit breaker.
Background
A gas-insulated switchgear is a device that plays an important role in protecting a power system from a short-circuit fault or the like during lightning strike, and for switching control for system operation. The phase 1 is composed of devices such as a vacuum circuit breaker, a disconnecting switch, a grounding switch, a high-speed grounding switch, a main bus, an instrument converter, an instrument transformer, a cable connecting part and the like. Then, 3 phases are arranged in parallel to form 1 circuit, and connected to the main bus.
Inside the grounded container of each device, SF6 gas, for example, having excellent insulation performance is sealed, and the high-voltage conductor is supported or fixed by an insulating spacer, an insulating tube, or the like. The gas-insulated switchgear is a sealed structure, and is not affected by the external environment, and therefore is widely used as a switchgear with high reliability. As an example of a conventional gas-insulated switchgear, a gas-insulated switchgear described in japanese patent application laid-open No. 2014-99381 (patent document 1) is known.
The invention in patent document 1 aims to provide a gas-insulated switchgear that can be miniaturized by reducing the height. The power receiving cable introduced from the cable head is electrically connected to the power receiving side disconnecting switch, the power receiving side grounding switch, and the lightning arrester.
In the region of the power receiving side, the circuit breaker is connected to the power receiving cable through a power receiving side disconnecting switch, and is connected to a disconnecting switch with a grounding switch arranged on the lower side via an insulating spacer, and the disconnecting switch with a grounding switch arranged on the lower side has a grounding electrode on the back side of the gas insulating container.
Further, the main circuit side electrode is connected to one of the bus bars via the main circuit side electrode with the disconnecting switch of the grounding switch disposed on the upper side. The disconnecting switch with grounding switch arranged on the upper side has a grounding electrode on the front surface side of the gas-insulated container, and the other bus bar is connected between the main circuit electrode of the disconnecting switch with grounding switch arranged on the upper side and the grounding electrode.
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2014-99381
Disclosure of Invention
Problems to be solved by the invention
Patent document 1 describes a gas-insulated switchgear including a circuit breaker, a disconnector, and the like provided in a closed container having a ground potential in which an insulating gas is sealed, and a supply unit for supplying power to a load side from a power receiving unit that receives power from a power system via the circuit breaker, the disconnector, and the like.
Then, in recent years, a vacuum circuit breaker is applied to a circuit breaker used in a gas-insulated switchgear, and a vacuum circuit breaker having a contact electrode housed in a gas-insulated container is disposed. In order to protect an insulating case forming a vacuum vessel from an arc (metal vapor) generated when the contact electrode cuts off a current, an arc shield is disposed around the contact electrode in a state of a floating potential.
Here, the potential of the arc shield of the vacuum circuit breaker operating at the levitation potential is determined by the space capacitance with the surrounding high-voltage member, ground potential member, and insulating member, but since the vacuum circuit breaker is disposed near the closed container at the ground potential, the potential of the arc shield of the vacuum circuit breaker is reduced to half or less of the applied voltage on the power supply side.
In such a case, since the voltage (potential difference) applied between the contact electrode on the side of the voltage application unit and the arc shield increases, the insulation distance needs to be increased, and there is a problem that the size (volume) of the vacuum circuit breaker cannot be reduced.
The invention aims to provide a gas-insulated switchgear capable of suppressing the rise of voltage (potential difference) applied between a contact electrode on the side of a voltage applying part and an arc shielding cover by raising the potential of the arc shielding cover of a vacuum circuit breaker.
Means for solving the problems
In order to solve the above-described problems, according to the present invention, there is provided a gas-insulated switchgear configured to support a vacuum circuit breaker having a fixed-side electrode and a movable-side electrode and an arc shield disposed around the electrodes in a sealed container in which a ground potential of an insulating gas is sealed, in a state of being electrically insulated from the sealed container, wherein an arc shield voltage adjustment conductor made of a conductive material is provided, one end of which is electrically connected to a high-voltage conductor on a power supply side of the vacuum circuit breaker, and the other end of which is located in the vicinity of the vacuum circuit breaker with a predetermined space therebetween.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, by raising the potential of the arc shield of the vacuum circuit breaker, the voltage (potential difference) applied between the contact electrode on the voltage applying portion side and the electromagnetic shield can be suppressed from being raised. Further, problems, structures, and effects other than those described above will be described by the description of the embodiments described below.
Drawings
Fig. 1 is a sectional view of a gas-insulated switchgear of a first embodiment of the present invention.
Fig. 2 is a sectional view illustrating a structure of the vacuum circuit breaker shown in fig. 1.
Fig. 3 is a sectional view of a gas-insulated switchgear of a second embodiment of the present invention.
Fig. 4 is a sectional view of a gas-insulated switchgear of a third embodiment of the present invention.
Fig. 5 is a sectional view of a gas-insulated switchgear of a fourth embodiment of the present invention.
Fig. 6 is a sectional view of a gas-insulated switchgear of a fifth embodiment of the present invention.
Fig. 7A is a cross-sectional view of a first modification of the arc shield voltage adjustment conductor used in the embodiment of the present invention.
Fig. 7B is a cross-sectional view of a second modification of the arc shield voltage adjustment conductor used in the embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following embodiments, and various modifications and applications of the technical concept of the present invention are also included in the scope. Hereinafter, embodiments of the gas-insulated switchgear of the present invention will be described with reference to the drawings. In addition, in each embodiment, the same reference numerals are used for the same constituent members.
Example 1
Fig. 1 shows a side cross section of a gas insulated switchgear according to a first embodiment of the present invention. In a gas-insulated switchgear configured as a power receiving unit for general consumers, a structure is adopted in which a high-voltage device component is supported by an insulating support in a state of being electrically insulated from a sealed container in which an insulating gas is filled in each gas-partitioned space.
For example, in the first sealed container 10 shown in fig. 1, a vacuum circuit breaker (vacuum valve) 11 is disposed, and one end (movable electrode side) of the vacuum circuit breaker 11 is connected to a disconnecting switch side high voltage conductor 12B via a circuit breaker side high voltage conductor 12A and a disconnecting switch 13, and further the disconnecting switch side high voltage conductor 12B is connected to a cable head 14, led out of the first sealed container 10 in an insulated state, and finally connected to a cable 15. The cable 15 is connected to various load devices not shown.
In the first sealed container 10, a grounding switch 16 is disposed to ground the internal high-voltage conductor 12B on the disconnecting switch side at the time of periodic inspection or the like. In the first sealed container 10 in which the vacuum circuit breaker 11, the disconnecting switch 13, the grounding switch 16, and the high-voltage conductors 12A and 12B connecting them are housed and arranged, an insulating support member 17 having a predetermined insulating property is arranged, and the vacuum circuit breaker 11, the disconnecting switch 13, the grounding switch 16, and the high-voltage conductors 12A and 12B connecting them are supported by the insulating support member 17 in a state of being electrically insulated from the first sealed container 10. Thus, the first closed casing 10 becomes the ground potential.
The other end (fixed electrode side) of the vacuum interrupter 11 is connected to an interrupter-side high-voltage conductor 12C, and the interrupter-side high-voltage conductor 12C is led out into a second sealed container 19, which is separated from the first sealed container 10 by an insulating spacer 18 and is connected to one end of a disconnecting switch 20.
The other end of the disconnecting switch 20 is connected to an adjacent device that is separated from the second closed vessel 19 by an insulating spacer 21 by a high-voltage conductor 12D. In the second sealed container 19 in which the disconnecting switch 20, the high-voltage conductor 12D, and the like are housed and arranged, an insulating support member 17 having a predetermined insulating performance is arranged, and the disconnecting switch 20, the high-voltage conductor 12D, and the like are supported by the insulating support member 17 in a state of being electrically insulated from the second sealed container 19. Thus, the second closed casing 19 becomes the ground potential.
The movable electrode side of the vacuum interrupter 11 (lower side of the vacuum interrupter), the movable side of the disconnector 13 (left side of the disconnector in the drawing), the movable side of the earthing switch 16 (left side of the earthing switch in the drawing), and the movable side of the disconnector 20 (left side of the disconnector in the drawing) are not shown in detail, and are led out while maintaining airtight of the first sealed container 10 and the second sealed container 19 via the connection mechanism, respectively, and are connected to the respective operation devices disposed in the operation cabinet 22.
Fig. 2 shows a cross section of the vacuum interrupter 11 shown in fig. 1. However, fig. 2 also shows an arc shield voltage adjusting conductor 23 which is a feature of the present embodiment, and will be described later.
In fig. 2, the vacuum interrupter 11 includes a fixed-side end plate 31 joined to one end of a cylindrical insulating case 30, a fixed-side conductor 32 penetrating the fixed-side end plate 31 in an airtight state, a movable-side end plate 33 joined to the other end of the cylindrical insulating case 30, and one endA bellows 34 connected to the movable-side end plate 33 and having a bellows shape allowing the movable portion to be driven, and a movable-side conductor 35 penetrating the bellows 34 in an airtight state, maintaining vacuum and being driven in the axial direction, wherein the internal pressure is maintained at about 10 -2 And a vacuum of Pa or less.
Further, inside the cylindrical insulating case 30, an arc shield 36 for suspending the potential supported by the cylindrical insulating case 30, a fixed-side electrode 37 fixed to an end of the fixed-side conductor 32, and a movable-side electrode 38 fixed to an end of the movable-side conductor 35 are arranged. The movable side conductor 35 is connected to an operating mechanism portion disposed outside the first closed casing 10 via an operating lever, not shown. The movable electrode 38 is driven in conjunction with the driving operation of the operation mechanism, and thus the contact separation between the fixed electrode 37 and the movable electrode 38, that is, the on state and the off state of the vacuum circuit breaker can be switched.
Here, the potential of the arc shield 36 of the vacuum interrupter 11 operated at the levitation potential is determined by the space capacitance around the high-voltage member, the ground potential member, and the insulating member disposed in the first sealed container 10. Therefore, since the vacuum circuit breaker 11 is disposed near the first sealed container 10 at the ground potential, the potential of the arc shield 36 of the vacuum circuit breaker 11 may be reduced to less than half the applied voltage, and the voltage (potential difference) applied between the fixed-side electrode 37 and the arc shield 36 may be increased, so that the insulation distance needs to be increased, and there is a problem that the size (volume) of the vacuum circuit breaker 11 cannot be reduced.
In order to solve this problem, the present embodiment proposes a configuration in which the electric potential of the arc shield 36 of the vacuum interrupter 11 is raised to suppress an increase in the voltage (potential difference) applied between the fixed-side electrode 37 and the arc shield 36.
Returning to fig. 1, in the present embodiment, an arc shield voltage adjusting conductor 23 electrically connected to a breaker-side high voltage conductor 12C disposed in a first sealed container 10 is provided in a gas-insulated switchgear in which a vacuum interrupter 11 is supported in an insulated state in a first grounded container 10.
That is, one end 23S of the arc-shield voltage adjustment conductor 23 is electrically connected to the breaker-side high-voltage conductor 12C disposed in the first sealed container 10 on the power supply side of the vacuum circuit breaker 11, and the other end 23E is disposed in the vicinity of the vacuum circuit breaker 11 with a "predetermined space distance" therebetween.
As shown in fig. 2, the arc shield voltage adjusting conductor 23 has a "rod-like" shape made of a conductive material such as aluminum or copper, and has a circular cross section. The tip is formed as a spherical surface or an arc surface other than a spherical surface. The shape is used to avoid electric field concentration and discharge when forming the corner. In the present embodiment, the spherical surface is regarded as an arc surface.
The arc-shield voltage adjusting conductor 23 is disposed so as to extend to the point P where the arc shield 36 is located. Further, the direction (axis direction) in which the arc-shield voltage adjusting conductor 23 extends is determined to be the same direction as the longitudinal direction of the arc shield 36. Here, the predetermined spatial distance (D) shown in fig. 2 is a distance that can ensure predetermined insulation performance to the extent that no discharge occurs between the vacuum interrupter 11 and the arc-shield voltage adjusting conductor 23. The distance is a value appropriately determined according to the specification of the gas-insulated switchgear.
In the gas-insulated switchgear of the present embodiment configured as described above, the arc-shield voltage-adjusting conductor 23 is disposed near the vacuum interrupter 11 (with a predetermined spatial distance therebetween), and thus, a capacitance is generated between the arc-shield 36 of the levitation potential disposed inside the cylindrical insulating case 30 and the arc-shield voltage-adjusting conductor 23, so that the potential of the arc-shield 36 of the levitation potential rises.
Here, when the arc shield voltage adjusting conductor 23 is not disposed, the potential of the arc shield 36 for suspending the potential is determined by the partial pressure of the electrostatic capacitance determined by the distance and the relative area between the high voltage conductors 12A to 12C around the vacuum interrupter 11 and the first sealed container 10 for the ground potential.
Since the capacitance between the first closed container 10 at the ground potential and the arc shield 36 at the levitation potential is larger than the capacitance between the high-voltage conductors 12A to 12C and the arc shield 36, the impedance between the first closed container 10 at the ground potential and the arc shield 36 at the levitation potential is smaller than the capacitance between the high-voltage conductors 12A to 12C and the arc shield 36, and the potential of the arc shield 36 is biased toward the ground potential (near the ground potential).
That is, the potential difference between the high-voltage conductors 12A to 12C and the arc shield 36 is larger than the potential difference between the first closed container 10 and the arc shield 36. In this case, since a high electric field is necessarily generated between the high-voltage conductors 12A to 12C having a large potential difference and the arc shield 36, the insulation distance needs to be increased, and as a result, the size of the vacuum interrupter 11 and the size of the gas-insulated switchgear are increased.
As shown in the present embodiment, the arc shield voltage adjusting conductor 23 is disposed near the vacuum interrupter 11 to raise the potential of the arc shield 36, and the potential difference between the closed vessel 10 and the arc shield 36 is made substantially equal to the potential difference between the high voltage conductors 12A to 12C and the arc shield 36, whereby the potential of the arc shield 36 of the vacuum interrupter 11 is raised, and the voltage applied to the voltage applying portion, that is, between the fixed-side electrode 37 and the arc shield 36 can be suppressed from being raised. As a result, the distance between the fixed-side electrode 37 and the arc shield 36 can be shortened, so that the vacuum circuit breaker can be miniaturized.
Further, since the arc shield voltage adjustment conductor 23 is connected to the breaker-side high voltage conductor 12C, the arc shield voltage adjustment conductor 23 can function as a heat radiation fin for joule heat generated by a current flowing through the breaker-side high voltage conductor 12C, and therefore, the diameter of the breaker-side high voltage conductor 12C can be reduced, which contributes to downsizing and weight saving of the gas-insulated switchgear.
Example 2
Next, a second embodiment of the present invention will be described. In the first embodiment, since the second sealed container 19 side is the power supply side, the arc shield voltage adjusting conductor 23 is connected to the breaker side high voltage conductor 12C. In contrast, in the second embodiment, the breaker-side high-voltage conductor 12A of the first sealed container 10 is used as the power source side. The same components as those of the first embodiment will not be described.
In fig. 3, the present embodiment is characterized in that an arc shield voltage adjusting conductor 24 electrically connected to a breaker-side high voltage conductor 12A disposed in the first sealed container 10 is provided in the gas-insulated switchgear in which the vacuum interrupter 11 is supported in an insulated state in the first grounded container 10.
That is, one end 24S of the arc shield voltage adjusting conductor 24 is electrically connected to the breaker-side high voltage conductor 12A disposed in the first sealed container 10 on the power supply side of the vacuum circuit breaker 11, and the other end 24E is disposed in the vicinity of the vacuum circuit breaker 11 with a predetermined space therebetween. The arrangement of the arc shield voltage adjusting conductor 24 and the vacuum interrupter 11 is the same as that of the first embodiment.
In the present embodiment, the arc shield voltage adjusting conductor 24 is also disposed near the vacuum interrupter 11 to raise the potential of the arc shield 36, and the potential difference between the closed vessel 10 and the arc shield 36 is made substantially equal to the potential difference between the high voltage conductors 12A to 12C and the arc shield 36, so that the potential of the arc shield 36 of the vacuum interrupter 11 is raised, and the voltage applied to the voltage applying portion, that is, between the fixed-side electrode 37 and the arc shield 36 can be suppressed from being raised. As a result, the distance between the fixed-side electrode 37 and the arc shield 36 can be shortened, so that the vacuum circuit breaker can be miniaturized.
Example 3
Next, a third embodiment of the present invention will be described. In the first embodiment, the surface of the arc shield voltage adjusting conductor 23 is exposed to the conductive material. In contrast, in the third embodiment, an insulating paint is applied to the surface of the arc-shield voltage-adjusting conductor 23. The same components as those of the first embodiment will not be described.
In fig. 4, an insulating coating layer 25C made of an insulating paint is formed on the surface of the arc shield voltage adjusting conductor 25 of the gas-insulated switchgear of the present embodiment. The insulating coating 25C may be formed on the entire surface of the arc-shield voltage-adjusting conductor 25 or may be formed only on a necessary portion.
The gas-insulated switchgear having such a structure can suppress the electric field on the surface of the arc-shield voltage-regulating conductor 25 connected to the breaker-side high-voltage conductor 12C, and thus can improve the insulation performance. As a result, the insulation distance between the arc-shield voltage adjusting conductor 25 and the surrounding components can be shortened, and therefore the gas-insulated switchgear can be further miniaturized.
Example 4
Next, a fourth embodiment of the present invention will be described. In the second embodiment, the surface of the arc shield voltage adjusting conductor 24 is exposed to the conductive material. In contrast, in the fourth embodiment, an insulating paint is applied to the surface of the arc-shield voltage-adjusting conductor 24. The same components as those of the second embodiment will not be described.
In fig. 5, an insulating coating 26C made of an insulating paint is formed on the surface of the arc shield voltage adjusting conductor 26 of the gas-insulated switchgear of the present embodiment. The insulating coating 26C may be formed on the entire surface of the arc-shield voltage-regulating conductor 26 or only on a necessary portion.
The gas-insulated switchgear having such a structure can suppress the electric field on the surface of the arc-shield voltage-regulating conductor 26 connected to the breaker-side high-voltage conductor 12A, and thus can improve the insulation performance. As a result, the insulation distance between the arc-shield voltage adjusting conductor 26 and the surrounding components can be shortened, and therefore the gas-insulated switchgear can be further miniaturized.
Example 5
Next, a fifth embodiment of the present invention will be described. In the first to fourth embodiments, arc shield voltage adjustment conductors 23 to 26 are connected to the breaker-side high voltage conductors 12C and 12A connected to the vacuum circuit breaker 11. In contrast, in the fifth embodiment, the high-voltage conductor 12B on the disconnecting switch side of the first closed vessel 10 is set as the power source side, and the arc-shield voltage adjusting conductor 27 is connected thereto. The same components as those of the first embodiment will not be described.
In fig. 6, an arc shield voltage adjusting conductor 27 is provided, which is electrically connected to the high-voltage conductor 12B on the disconnecting switch side connected to the disconnecting switch 13, which is disposed in the first sealed container 10.
That is, one end 27S of the arc shield voltage adjusting conductor 27 is electrically connected to the disconnecting switch side high voltage conductor 12B disposed in the first sealed container 10 on the power supply side of the vacuum interrupter 11, and the other end 27E is disposed in the vicinity of the vacuum interrupter 11 with a "predetermined space distance" therebetween. The arrangement structure of the arc shield voltage adjusting conductor 27 and the vacuum interrupter 11 is different from the above embodiment in that it is arranged in a direction orthogonal to the longitudinal direction of the arc shield 36.
In the present embodiment, too, the arc shield voltage adjusting conductor 27 is disposed near the vacuum interrupter 11 to raise the potential of the arc shield 36, and the potential difference between the closed vessel 10 and the arc shield 36 is made substantially equal to the potential difference between the high voltage conductors 12A to 12C and the arc shield 36, whereby the potential of the arc shield 36 of the vacuum interrupter 11 is raised, and the voltage applied to the voltage applying portion, that is, between the movable side electrode 38 and the arc shield 36 can be suppressed from being raised. As a result, the distance between the movable electrode 38 and the arc shield 36 can be shortened, so that the vacuum circuit breaker can be miniaturized.
Example 6
Next, a modification of the shape of the arc shield voltage adjustment conductors 23 to 26 will be described. The arc shield voltage adjusting conductors 23 to 26 are solid bars made of conductive material and have a circular cross section. In contrast, the shape may be changed as described below. In the following, arc shield voltage adjustment conductors 23 to 26 are drawn in an exaggerated manner to facilitate understanding.
In fig. 7A, arc shield voltage adjusting conductors 23 to 26 are solid bars made of conductive material and have an elliptical cross section. With this shape, the electric potential of the arc shield 36 of the vacuum interrupter 11 can be raised. In addition, since there is no corner, electric field concentration can be suppressed.
In fig. 7B, the arc shield voltage adjusting conductors 23 to 26 are solid bars made of a conductive material and have an arc-shaped or arc-shaped cross section. With this shape, the electric potential of the arc shield 36 of the vacuum interrupter 11 can be raised. In addition, since there is no corner, electric field concentration can be suppressed. In the present embodiment, the arc shape is regarded as an arc shape.
As described above, according to the present invention, there is provided a gas-insulated switchgear configured to support a vacuum circuit breaker having a fixed-side electrode and a movable-side electrode in a sealed container having a ground potential in which an insulating gas is sealed, and an arc shield disposed around these electrodes, in a state of being electrically insulated from the sealed container, wherein an arc shield voltage adjustment conductor made of a conductive material is provided, one end of which is electrically connected to a high-voltage conductor on a power supply side of the vacuum circuit breaker, and the other end of which is located near the vacuum circuit breaker with a predetermined space distance therebetween.
Thus, by raising the arc shield potential of the vacuum circuit breaker, the voltage increase applied between the contact electrode on the voltage applying portion side and the arc shield can be suppressed.
The present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments are specifically described for the purpose of easily understanding the present invention, and are not limited to the configuration in which all the description is necessary. In addition, a part of the structure of one embodiment may be replaced with a part of the structure of another embodiment. In addition, the structure of another embodiment may be added to the structure of a certain embodiment. In addition, a part of the structure of each embodiment may be deleted, added, or replaced with a part of another structure.
Description of the reference numerals
10 … first closed vessel, 11 … vacuum interrupter (vacuum valve), 12a … interrupter side high voltage conductor, 12B … disconnector side high voltage conductor, 12C … interrupter side high voltage conductor, 12D … high voltage conductor, 13 … disconnector, 14 … cable head, 15 … cable, 16 … grounded switch, 17 … insulating support member, 18 … insulating spacer, 19 … second closed vessel, 20 … disconnector, 22 … operating cabinet, 23 … arc shield voltage adjustment conductor, 25C, 26C … insulating coating, 30 … cylinder insulating housing, 31 … fixed side end plate, 32 … fixed side conductor, 33 … movable side end plate, 34 … bellows, 35 … movable side conductor, 36 … arc shield, 37 … fixed side electrode, 38 … movable side electrode.
Claims (4)
1. A gas-insulated switchgear configured to support a vacuum circuit breaker having a fixed-side electrode and a movable-side electrode and an arc shield disposed around the electrodes in a sealed container having a ground potential in which an insulating gas is sealed, in a state of being electrically insulated from the sealed container, the gas-insulated switchgear characterized by:
an arc shield voltage adjusting conductor made of a conductive material is provided, and one end of the arc shield voltage adjusting conductor is electrically connected to a high-voltage conductor on a power supply side of the vacuum circuit breaker, and the other end of the arc shield voltage adjusting conductor is positioned in the vicinity of the vacuum circuit breaker with a predetermined spatial distance therebetween.
2. The gas-insulated switchgear as claimed in claim 1, wherein:
the high-voltage conductor is a breaker-side high-voltage conductor connected to the vacuum breaker.
3. A gas-insulated switchgear as claimed in claim 1 or 2, wherein:
the arc shield voltage adjustment conductor extends along the length direction of the arc shield, and the cross section of the arc shield voltage adjustment conductor is any one of round, elliptical and arc.
4. A gas-insulated switchgear as claimed in claim 1 or 2, wherein:
an insulating coating is formed on a surface of the arc shield voltage adjustment conductor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-134078 | 2021-08-19 | ||
| JP2021134078A JP2023028398A (en) | 2021-08-19 | 2021-08-19 | gas insulated switchgear |
| PCT/JP2022/025233 WO2023021842A1 (en) | 2021-08-19 | 2022-06-24 | Gas-insulated switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117716460A true CN117716460A (en) | 2024-03-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280051088.2A Pending CN117716460A (en) | 2021-08-19 | 2022-06-24 | Gas-insulated switchgear |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2023028398A (en) |
| CN (1) | CN117716460A (en) |
| WO (1) | WO2023021842A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116666150B (en) * | 2023-08-02 | 2023-10-03 | 四川宝光电器设备有限公司 | Vacuum circuit breaker and switchgear |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001312948A (en) * | 2000-04-28 | 2001-11-09 | Toshiba Corp | Switching device |
| JP2006080036A (en) * | 2004-09-13 | 2006-03-23 | Toshiba Corp | Vacuum circuit breaker |
| JP4234125B2 (en) * | 2005-09-27 | 2009-03-04 | 株式会社日立製作所 | Multi-circuit selection switchgear |
| JP5175516B2 (en) * | 2007-10-09 | 2013-04-03 | 株式会社東芝 | Vacuum valve |
| JP2013055738A (en) * | 2011-09-01 | 2013-03-21 | Hitachi Ltd | Switching device |
| JP5619044B2 (en) * | 2012-02-09 | 2014-11-05 | 株式会社日立製作所 | Switch unit complex or switchgear |
| EP3217416A4 (en) * | 2014-11-07 | 2018-07-04 | Mitsubishi Electric Corporation | Vacuum circuit breaker and direct current circuit breaker |
-
2021
- 2021-08-19 JP JP2021134078A patent/JP2023028398A/en active Pending
-
2022
- 2022-06-24 CN CN202280051088.2A patent/CN117716460A/en active Pending
- 2022-06-24 WO PCT/JP2022/025233 patent/WO2023021842A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| JP2023028398A (en) | 2023-03-03 |
| WO2023021842A1 (en) | 2023-02-23 |
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