CN217690934U - Isolating switch base, double-break isolating switch and three-station isolating grounding switch - Google Patents

Abstract

The utility model relates to an isolator base, two break isolator and three station isolation earthing switch, this isolator base are used for gas-insulated metal-enclosed switchgear, and this isolator base includes: a housing; the first static contact seat and the second static contact seat are oppositely arranged on the inner surface of the shell; and the conductive support is arranged in the shell and is provided with a first connecting part and a second connecting part, the first connecting part is positioned on the inner surface of the shell and is positioned between the first static contact seat and the second static contact seat on the inner surface, the second connecting part is positioned at the center of the shell and is connected to a moving contact, so that the moving contact can rotate around the center of the second connecting part to be connected with or disconnected with the first static contact seat and/or the second static contact seat, the technical effects of providing a miniaturized isolating switch capable of switching larger bus conversion current and voltage and providing a miniaturized three-station isolating grounding switch are achieved.

Description

Isolating switch base, double-break isolating switch and three-station isolating grounding switch

Technical Field

The application relates to the field of isolating switches, in particular to an improved isolating switch base, a double-break isolating switch comprising the same and a three-position isolating grounding switch.

Background

The isolating switch is used for isolating a circuit at an opening position, reliably isolating a power failure part (such as a circuit breaker at the rear end) from a live part (such as a bus), ensuring that an insulating distance meeting the specified requirement exists between contacts and forming an obvious visible fracture; when the switch is closed, the live part and the power cut part are conducted to bear the working current under the normal loop condition and the short-circuit current under the abnormal condition (such as short circuit) within the specified time.

Single-break disconnectors are currently used in electrical systems, for example in gas-insulated metal-enclosed switchgear (GIS systems). For the single-break disconnecting switch, when the single-break disconnecting switch is located at a disconnecting position, a break is formed between the moving contact and the static contact base to realize internal electrical insulation, the actual working condition of the electrical equipment at the moment is that one side of the break is electrified, and the other side of the break can be powered off and grounded or subjected to a withstand voltage test. However, in the case of a single interruption, an interruption breakdown from the side of the interruption which runs live to the other side is liable to occur. Therefore, when the single-break disconnecting switch is used for the complete bus end extension interval, or used as a long-term interval extension interface together with the bus in one period, or used for a voltage withstand test after the extension equipment is installed, the whole bus or even the whole power station connected with the bus needs to be powered off, so that the use is inconvenient. Moreover, the bus that the single-break disconnector can open and close has limited switching current and voltage.

Therefore, an improved isolating switch which can realize the expansion of the end part of the bus without power failure, can switch larger bus conversion current and voltage and meets the miniaturization requirement is desired.

In addition, in the place where the high-voltage electrical apparatus is used, even if the live part is isolated by using the isolating switch, the voltage and current induced on the conductor of the equipment to be repaired are enough to cause damage to the maintainer, so that the equipment to be repaired may need to be reliably grounded by using the grounding switch. In view of practical application requirements, an improved three-position isolating grounding switch is further desired, so that the three-position isolating grounding switch can flexibly switch between the isolating switch and the grounding switch and simultaneously meet the miniaturization requirement.

SUMMERY OF THE UTILITY MODEL

The present application is proposed in view of the above problems, and a main object of the present application is to provide an improved isolator base and a dual-break isolator and a three-position isolation grounding switch including the same, so as to solve at least the technical problems that it is difficult to realize an isolator which satisfies the miniaturization requirement, can realize the extension of a bus end without power outage and can open and close a larger bus conversion current and voltage, and it is difficult to realize a miniaturized three-position isolation grounding switch in the prior art.

In order to achieve the above object, according to one aspect of the present application, there is provided a disconnection base for a gas insulated metal enclosed switchgear, the disconnection base including: a housing; the first static contact seat and the second static contact seat are oppositely arranged on the inner surface of the shell; and a conductive support installed in the housing and having a first connection part and a second connection part, the first connection part being located on an inner surface of the housing and between the first stationary contact and the second stationary contact on the inner surface, wherein the second connection part is located at a center of the housing and connected to a movable contact so that the movable contact can rotate about the center of the second connection part to be engaged with or disengaged from the first stationary contact and/or the second stationary contact.

In this way, the isolator base has a stable and compact structure, and the isolator base can be suitable for a double-break isolator and a three-position isolating grounding switch, so that the isolator base is easy to be widely applied.

Further, according to an embodiment of the present application, the movable contact rotates about a center of the second connection portion to be parallel to the conductive support or perpendicular to the conductive support.

In this way, the movable contact can rotate to engage with or disengage from the first stationary contact and/or the second stationary contact. For example, when the movable contact rotates to be parallel to the conductive support, the movable contact can be disconnected from both the first static contact and the second static contact; when the movable contact rotates to be perpendicular to the conductive support, the movable contact can be jointed with at least one of the first stationary contact and the second stationary contact.

Further, according to an embodiment of the present application, the first stationary contact and the second stationary contact are symmetrically arranged with respect to the conductive support.

In this way, the simultaneous engagement and the simultaneous disengagement of the movable contact with the first stationary contact and the second stationary contact are easily achieved.

Further, according to an embodiment of the present application, a guide ring and a spring contact finger are disposed in the second connecting portion of the conductive support, and the second connecting portion is connected to the movable contact via the guide ring and the spring contact finger.

In this way, it is possible to achieve electrical communication between the conductive support and the movable contact, and to enable the movable contact to rotate about the centre of the second connection portion of the conductive support.

Further, according to one embodiment of the present application, each of the first stationary contact, the second stationary contact, and the conductive support is mounted to the case via an insulating tub to be capable of electrically communicating with an outside of the case.

In this way, the first stationary contact, the second stationary contact, and the conductive support, which are conductive, can be maintained electrically isolated from the insulating housing by the insulating member at the periphery of the insulating tub, and the first stationary contact, the second stationary contact, and the conductive support can be electrically connected to the outside of the housing by the conductive contact block at the center of the insulating tub.

Further, according to an embodiment of the present application, the housing has an axisymmetric shape.

In this way, the first stationary contact, the second stationary contact, and the conductive support are easily arranged on the housing, and the disconnecting switch base can be made to have a stable and compact structure.

According to another aspect of the present application, there is also provided a dual-break isolator switch, including: the isolating switch base; a moving contact connected to the second connection part of the conductive holder of the disconnection switch base to rotate around the center of the second connection part; and a drive mechanism connected to the movable contact and configured to: the moving contact is driven to rotate, so that the moving contact is connected with the first static contact seat and the second static contact seat at the same time, or the moving contact is disconnected with the first static contact seat and the second static contact seat at the same time.

With this kind of mode, double break isolator is small, compact structure, and can effectively avoid the fracture breakdown between electrified generating line and the equipment of treating the power supply, consequently can realize the extension of not having a power failure of generating line tip and open and shut bigger generating line conversion current and voltage when satisfying the miniaturized requirement.

Further, according to an embodiment of the present application, the length of the movable contact is greater than a distance between the first stationary contact and the second stationary contact.

In this way, by rotating the moving contact, simultaneous engagement of the moving contact with the first stationary contact and the second stationary contact and simultaneous disconnection of the moving contact with the first stationary contact and the second stationary contact can be achieved.

Further, according to an embodiment of the present application, when the moving contact is parallel to the conductive support, the double-break disconnecting switch is in the opening position; when the moving contact is vertical to the conductive support, the double-break isolating switch is in a switching-on position.

In this way, the moving contact is rotated to be parallel or vertical to the conductive support, so that the switching-on and switching-off of the double-break isolating switch can be realized.

Further, according to an embodiment of the present application, one of the first stationary contact and the second stationary contact is connected to a live bus outside the housing, and the other of the first stationary contact and the second stationary contact is connected to a device to be powered outside the housing.

In this way, with the double break disconnector, it is possible to conduct the live bus from the device to be powered or to electrically isolate the live bus from the device to be powered.

According to yet another aspect of the present application, there is also provided a three-position isolating grounding switch, comprising: the isolating switch base; a moving contact connected to a second connection part of the conductive holder of the disconnection switch base to rotate around the center of the second connection part; and a drive mechanism connected to the movable contact and configured to: the moving contact is driven to rotate, so that the moving contact is only connected with the first static contact seat, only connected with the second static contact seat, or disconnected with both the first static contact seat and the second static contact seat.

In this way, the three-position disconnecting grounding switch has a miniaturized structure and can be flexibly switched between the disconnecting switch and the grounding switch.

Further, according to an embodiment of the present application, a length of the movable contact is smaller than a distance between the first stationary contact and the second stationary contact.

In this way, by rotating the movable contact, it is possible to achieve that the movable contact is engaged only with the first stationary contact, engaged only with the second stationary contact, or disengaged from both the first stationary contact and the second stationary contact.

Further, according to an embodiment of the present application, when the movable contact is engaged with only one of the first stationary contact and the second stationary contact, the three-position disconnecting and grounding switch is in a disconnecting and switching position; when the moving contact is only jointed with the other one of the first static contact seat and the second static contact seat, the three-station isolation grounding switch is in a grounding switch-on position; when the moving contact is disconnected with the first static contact seat and the second static contact seat, the three-station isolation grounding switch is in a brake separating position.

In this manner, the three-position isolating grounding switch may operate as either an isolating switch or a grounding switch, and engagement of the movable contact with one of the first stationary contact and the second stationary contact may correspond to closing of the isolating switch, engagement with the other may correspond to closing of the grounding switch, and disengagement of both may correspond to opening of the isolating switch/grounding switch.

Further, according to an embodiment of the present application, one of the first stationary contact and the second stationary contact is connected to a live bus outside the housing, and the other of the first stationary contact and the second stationary contact is grounded.

In this way, the three-position isolating grounding switch can be operated as an isolating switch or a grounding switch.

Further, according to an embodiment of the present application, the first connecting portion of the conductive holder is connected to the device to be powered outside the housing.

In this way, when the movable contact is engaged with the first stationary contact, the device to be powered can be placed in electrical communication with the conductor to which the first stationary contact is connected; when the moving contact is connected with the second static contact base, the equipment to be powered can be in electric communication with the conductor connected with the second static contact base.

In an embodiment of the present application, there is provided a disconnector base for a gas insulated metal enclosed switchgear, the disconnector base comprising: a housing; the first static contact seat and the second static contact seat are oppositely arranged on the inner surface of the shell; and the conductive support is arranged in the shell and is provided with a first connecting part and a second connecting part, the first connecting part is positioned on the inner surface of the shell and is positioned between the first static contact seat and the second static contact seat on the inner surface, the second connecting part is positioned at the center of the shell and is connected to a moving contact, so that the moving contact can rotate around the second connecting part to be connected with or disconnected with the first static contact seat and/or the second static contact seat, the problems that in the prior art, an isolating switch which can realize uninterrupted power expansion of the end part of the bus while meeting the miniaturization requirement is difficult to realize, and a three-station isolating grounding switch which meets the miniaturization requirement is difficult to realize are solved, and the effects of providing a double-break isolating switch which can realize uninterrupted power expansion of the end part of the bus while meeting the miniaturization requirement and a three-station isolating grounding switch which can flexibly switch between the isolating switch and the grounding switch while meeting the miniaturization requirement are realized.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of a disconnector base and a double-break disconnector comprising the disconnector base in a breaking position according to an embodiment of the application;

FIG. 2 is a schematic structural diagram of a double break disconnector in a closed position according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a disconnecting switch base and a three-position disconnecting and grounding switch comprising the disconnecting switch base in an opening position according to an embodiment of the application;

fig. 4 is a schematic structural diagram of a three-position disconnecting-grounding switch in an disconnecting-switching position according to an embodiment of the application; and is provided with

Fig. 5 is a schematic structural diagram of a three-position disconnecting and grounding switch according to an embodiment of the present application in a grounding closing position.

Wherein the figures include the following reference numerals:

100: isolation switch base

200: double-fracture isolating switch

300: three-station isolation grounding switch

1. 5, 10: insulating basin

2: first stationary contact base

3: shell body

4: second stationary contact base

6: conductive support

6A: first connecting part of conductive support

6B: second connecting part of conductive support

6C: semi-open cavity of conductive support

7: guide ring

8: spring contact finger

9: moving contact

11: shielding cover

12: insulating shaft

13: driving mechanism

Detailed Description

In order to avoid conflict, the embodiments and features of the embodiments in the present application may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is to be noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In this application, where the contrary is not intended, directional words such as "upper, lower, top and bottom" are generally used with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, vertical or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the application.

The utility model provides an aim at provides a isolator base that can satisfy miniaturized requirement and including its two break isolator and three-station isolation earthing switch. This double break isolator makes can realize the extension of not having a power failure of bus-bar tip when satisfying the miniaturization requirement, and this three-station isolation earthing switch makes can switch in a flexible way between isolator and earthing switch when satisfying the miniaturization requirement.

Fig. 1 is a schematic structural diagram of a disconnector base and a double-break disconnector including the disconnector base in a breaking position according to an embodiment of the application. Specifically, (a) of fig. 1 shows a schematic plan (xy) cross-sectional view of a disconnector base 100 and a double break disconnector 200 comprising the same. Fig. 1 (b) showsbase:Sub>A schematic cross-sectional view of the disconnection switch base 100 and the double break disconnection switch 200 including the same, taken alongbase:Sub>A-base:Sub>A in fig. 1 (base:Sub>A).

As shown in fig. 1 (a), the disconnection switch base 100 according to the embodiment of the present application includes: a housing 3; a first stationary contact 2 and a second stationary contact 4 which are oppositely disposed on an inner surface of the housing 3; and a conductive support 6 installed in the housing 3 and having a first connection portion 6A and a second connection portion 6B, the first connection portion 6A being located on an inner surface of the housing 3 and between the first stationary contact 2 and the second stationary contact 4 on the inner surface, wherein the second connection portion 6B is located at a center of the housing 3 and connected to a movable contact 9 such that the movable contact 9 can rotate about the center of the second connection portion 6B to be engaged with or disengaged from the first stationary contact 2 and/or the second stationary contact 4.

Further, the movable contact 9 can rotate about the center of the second connection portion 6B to be parallel to the conductive support 6, or perpendicular to the conductive support 6.

Further, the first stationary contact 2 and the second stationary contact 4 are symmetrically arranged with respect to the conductive support 6. In fig. 1, the first stationary contact 2 and the second stationary contact 4 are shown as being symmetrically arranged in the horizontal (x) direction, and the conductive support 6 is arranged in the vertical (y) direction. Alternatively, the conductive support 6 may be arranged in the horizontal direction, and the first stationary contact 2 and the second stationary contact 4 may be arranged symmetrically in the vertical direction. In addition, in fig. 1, the first connection portion 6A of the conductive holder 6 is located on the inner surface of the bottom of the case 3. Alternatively, the first connecting portion 6A may be located on the inner surface of the top of the housing 3 as long as the first connecting portion 6A is located between the first stationary contact 2 and the second stationary contact 4.

The disconnector base 100 may also comprise an insulating basin. The insulating basin includes a conductive contact block and an insulator, the conductive contact block being located in the center of the insulating basin and surrounded by the insulator. Each of the first stationary contact 2, the second stationary contact 4, and the conductive support 6 is mounted to the housing 3 via an insulating tub. As shown in fig. 1, the first stationary contact 2 is mounted to the housing 3 via an insulating tub 1, the second stationary contact 4 via an insulating tub 5, and the conductive mount 6 via an insulating tub 10.

In the present application, the housing 3 is insulated, and the movable contact 9, the first stationary contact 2, the second stationary contact 4, and the conductive support 6 are all conductive. Therefore, the first stationary contact 2, the second stationary contact 4, and the conductive support 6, which are conductive, can be kept electrically isolated from the insulating housing 3 by the insulating member of the insulating pot, and the first stationary contact 2, the second stationary contact 4, and the conductive support 6 can be electrically connected to the outside of the housing 3 via the conductive contact block at the center of the insulating pot by the conductive contact block.

As shown in fig. 1 (b), the conductive support 6 has an upper vertical section, a middle arc section (shown as a left circular arc section in fig. 1 (b)), and a lower vertical section, and the first connection portion 6A is located at the end of the lower vertical section. The conductive support 6 is in the form of a semi-open frame structure. The upper vertical section, the middle arcuate section and the lower vertical section together define a semi-open chamber 6C. The second connection portion 6B of the conductive holder 6 is formed by extending inward (in the z direction in the drawing) from the intermediate arc-shaped section. As shown in fig. 1 (B), the second connecting portion 6B is located at a substantially center inside the housing 3, and has a circular tube shape to accommodate a part of the movable contact 9. The open end of the semi-open chamber 6C is opposite the middle arcuate segment and is defined by an upper vertical segment and a lower vertical segment. The disconnection switch base 100 may further include a shield cover 11, and the open end is connected to the shield cover 11 (as shown by the right circular arc section in fig. 1 (b)). That is, the shield cover 11 is connected to the upper and lower vertical sections to close the semi-open cavity 6C. The shielding cover 11 and the conductive support 6 thus form a closed frame structure. The shield cover 11 functions to uniform an electric field.

It should be noted that the conductive support 6 may also be connected to the top of the housing 3 via an insulating basin (not shown in fig. 1). Thus, the conductive support 6 can also be electrically connected with an external device from the top of the housing 3 via the insulating pot.

The conductive support 6 is used for supporting the movable contact 9 and is electrically connected with the movable contact 9. Specifically, a part of the movable contact 9 is rotatably fitted in the second connecting portion 6B of the conductive holder 6 so that the movable contact 9 can rotate in a vertical plane (xy plane shown in fig. 1) about the center (or central axis) of the second connecting portion 6B. Thus, the movable contact 9 can rotate so as to be parallel to the conductive support 6 (i.e. not connected to both the first stationary contact 2 and the second stationary contact 4), or so as to be connected to at least one of the first stationary contact 2 and the second stationary contact 4.

Further, a guide ring 7 and a spring contact finger 8 are provided in the second connecting portion 6B of the conductive support 6, and the second connecting portion 6B is connected to the movable contact 9 via the guide ring 7 and the spring contact finger 8 (i.e., a portion of the movable contact 9 is rotatably engaged with the second connecting portion 6B via the guide ring 7 and the spring contact finger 8), so that the conductive support 6 is in electrical communication with the movable contact 9 and the movable contact 9 can rotate about the center (or central axis) of the second connecting portion 6B.

The disconnector base 100 may also comprise an insulating shaft 12. The insulating shaft 12 is used to mechanically connect the movable contact 9 with a driving mechanism 13 outside the housing 3, so that the driving mechanism 13 can drive the movable contact 9 to rotate by driving the insulating shaft 12 to rotate. As shown in fig. 1 (b), an insulating shaft 12 penetrates the shield cover 11 to mechanically connect the movable contact 9 and the driving mechanism 13.

In the present application, the housing 3 may have an axisymmetric shape. In addition, the first stationary contact 2 and the second stationary contact 4 may be symmetrically arranged on the housing 3 around a central axis (e.g., y-axis) of the housing 3, and the conductive support 6 and the movable contact 9 may be arranged along the central axis of the housing 3. Thus, the disconnection switch base 100 and the double break disconnection switch 200 including the same may have a stable and compact structure.

The structure and function of the isolator base 100 according to the embodiments of the present application are described above with reference to fig. 1. Next, a double break disconnector 200 including the disconnector base 100 according to an embodiment of the present application will be described with reference to fig. 1 and 2. Fig. 2 is a schematic structural diagram of a double-break disconnector in a closing position according to an embodiment of the application. The double break disconnector 200 shown in fig. 2 is identical to that shown in fig. 1. Specifically, (a) of fig. 2 shows a schematic plan (xy) cross-sectional view of a double break isolator switch 200. Fig. 2 (B) shows a schematic cross-sectional view of the double break isolator switch 200 taken along B-B in fig. 2 (a).

As shown in fig. 1 and 2, a double break isolator switch 200 according to an embodiment of the present application includes: the above-mentioned isolator switch base 100; a movable contact 9 connected to the second connection part 6B of the conductive holder 6 of the disconnection switch base 100 to rotate around the center of the second connection part 6B; and a driving mechanism 13 connected to the movable contacts 9 and configured to: the moving contact 9 is driven to rotate, so that the moving contact 9 is simultaneously connected with the first static contact seat 2 and the second static contact seat 4, or the moving contact 9 is simultaneously disconnected with the first static contact seat 2 and the second static contact seat 4.

Further, when the driving mechanism 13 drives the movable contact 9 to be simultaneously engaged with the first stationary contact 2 and the second stationary contact 4, the double-break disconnecting switch 200 is in the switching-on position. When the driving mechanism 13 drives the movable contact 9 to be disconnected from the first stationary contact 2 and the second stationary contact 4 simultaneously, the dual-break disconnecting switch 200 is in the opening position.

Fig. 1 shows the movable contact 9 in a vertical position (i.e. parallel to the conductive support 6). At this time, the movable contact 9 is disconnected from the first stationary contact 2 and the second stationary contact 4 at the same time, so that the dual-break disconnecting switch 200 is in the disconnecting position.

Fig. 2 shows the movable contact 9 in a horizontal position (i.e. perpendicular to the conductive support 6). At this time, the movable contact 9 is simultaneously engaged with the first stationary contact 2 and the second stationary contact 4, so that the dual-break disconnecting switch 200 is in the closing position.

Therefore, the movable contact 9 can be driven by the driving mechanism 13 to rotate clockwise or counterclockwise by 90 degrees, so that the movable contact 9 rotates to the horizontal position or the vertical position, and the double-break disconnecting switch 200 is in the closing or opening position.

Further, since both the first stationary contact 2 and the second stationary contact 4 can be in electrical communication with the outside of the housing 3, it is possible to connect one of the first stationary contact 2 and the second stationary contact 4 to an electrified bus outside the housing 3, and connect the other of the first stationary contact 2 and the second stationary contact 4 to a device to be powered outside the housing 3. Thus, when the double break disconnector 200 is in the switched-on position, the live bus may supply power to the device to be powered via the double break disconnector 200. When the dual break disconnect switch 200 is in the open position, the live bus can be electrically isolated from the device to be powered.

It should be noted that, in this application, because two stationary contact bases, namely the first stationary contact base 2 and the second stationary contact base 4, are adopted, when the double-break isolating switch 200 is located at the switching-off position, the moving contact 9 and the first stationary contact base 2 and the second stationary contact base 4 respectively form a fracture, namely, two series-connected fractures are formed between the live bus and the equipment to be powered, so that the insulating distance between the live bus and the equipment to be powered is increased, and the fracture breakdown of the live bus to the equipment to be powered is avoided.

The double break disconnector 200 according to the present application, due to its two breaks, can open/engage larger bus switching currents and voltages. Therefore, no matter the expansion connector is used for expanding the end part of the bus at a complete interval or is used as a long-term interval expansion interface together with the bus at one stage, the expansion can be realized without power failure by using the double-break isolating switch 200. That is, when the equipment to be fed is expanded, the bus end can be expanded or a withstand voltage test can be performed on the equipment to be fed with the bus charged without disconnecting the bus side.

Also, since the disconnection base 100 of the double break disconnection switch 200 has a stable and compact structure, the double break disconnection switch 200 according to the embodiment of the present application may also have a stable and compact structure, thereby satisfying the miniaturization requirement.

It should be noted that in the case of the double break disconnector 200, the first connection portion 6A of the conductive support 6 is not electrically connected with any device outside the housing 3.

In addition, the first stationary contact 2 and the insulating tub 1, and the second stationary contact 4 and the insulating tub 5 may be detachably mounted to the housing 3. When the large bus is not required to be switched to convert current and voltage, one of the first stationary contact seat 2 and the second stationary contact seat 4 (or one of the first stationary contact seat and the second stationary contact seat is not connected with external equipment) can be omitted, and the length of the movable contact 9 is shortened by half, so that the double-break isolating switch 200 can also be used as a single-break isolating switch.

Fig. 3-5 show isolator base and three-position isolation earthing switch including it according to the embodiment of this application. The isolator switch base 100 shown in fig. 3-5 is the same as that shown in fig. 1-2, and therefore, the description thereof is omitted. In fact, the three-position isolating grounding switch 300 shown in fig. 3 to 5 differs from the double-break isolating switch 200 shown in fig. 1 to 2 only in that: the movable contact 9 shown in fig. 3 to 5 is different from the movable contact 9 shown in fig. 1 to 2, and the devices outside the housing 3 to which the first stationary contact 2, the second stationary contact 4 and the conductive support 6 are connected in fig. 3 to 5 are different from those in fig. 1 to 2. Specifically, the length of the movable contact 9 shown in fig. 1 to 2 is greater than the distance between the first stationary contact 2 and the second stationary contact 4, while the length of the movable contact 9 shown in fig. 3 to 5 (the length of which is about half of the length of the movable contact shown in fig. 1 to 2) is smaller than the distance between the first stationary contact 2 and the second stationary contact 4.

Specifically, fig. 3 is a schematic structural diagram of an isolator base and a three-position isolating grounding switch including the isolator base in an opening position according to an embodiment of the present application. Fig. 3 (base:Sub>A) showsbase:Sub>A schematic plan (xy) cross-sectional view of the three-position disconnecting-grounding switch 300 in the opening position, and fig. 3 (b) showsbase:Sub>A schematic cross-sectional view of the three-position disconnecting-grounding switch 300 taken alongbase:Sub>A-base:Sub>A in fig. 3 (base:Sub>A). Fig. 4 is a schematic structural diagram of a three-position disconnecting and grounding switch in an disconnecting and closing position according to an embodiment of the application. Fig. 4 (a) shows a schematic plan (xy) cross-sectional view of the three-position disconnecting-grounding switch 300 in the disconnecting-switching position, and fig. 4 (B) shows a schematic cross-sectional view of the three-position disconnecting-grounding switch 300 taken along B-B in fig. 4 (a). Fig. 5 is a schematic structural diagram of a three-position disconnecting-grounding switch according to an embodiment of the present application in a grounding-closing position. Fig. 5 (a) shows a schematic plan (xy) cross-sectional view of the three-position disconnecting-grounding switch 300 in a grounding-on position, and fig. 5 (b) shows a schematic cross-sectional view of the three-position disconnecting-grounding switch 300 taken along C-C in fig. 5 (a).

As shown in fig. 3 to 5, the three-position isolating ground switch 300 according to the embodiment of the present application includes: the above-mentioned isolator switch base 100; a movable contact 9 connected to the second connection part 6B of the conductive support 6 of the disconnection switch base 100 to rotate around the center of the second connection part 6B; and a driving mechanism 13 connected to the movable contacts 9 and configured to: the movable contact 9 is driven to rotate, so that the movable contact 9 is only connected with the first stationary contact 2, only connected with the second stationary contact 4, or disconnected with both the first stationary contact 2 and the second stationary contact 4.

The movable contact 9 shown in fig. 3 to 5 has a shorter length than the movable contact 9 shown in fig. 1 to 2, so that the movable contact 9 cannot be engaged with one of the first stationary contact 2 and the second stationary contact 4 when engaged with the other of the first stationary contact 2 and the second stationary contact 4. It can be preset so that when the driving mechanism 13 drives the movable contact 9 to rotate, the movable contact 9 rotates 90 degrees or 180 degrees to be in a vertical position (as shown in fig. 3), or a horizontal left position (as shown in fig. 4), or a horizontal right position (as shown in fig. 5).

Further, when the movable contact 9 is engaged with one of the first stationary contact 2 and the second stationary contact 4, the three-position isolation grounding switch 300 is in the isolation closing position; when the movable contact 9 is engaged with the other of the first stationary contact 2 and the second stationary contact 4, the three-position isolation grounding switch 300 is in a grounding switch-on position; when the moving contact 9 is disconnected from both the first stationary contact 2 and the second stationary contact 4, the three-position disconnecting and grounding switch 300 is in a switching-off position. For example, when the movable contact 9 is engaged with the first stationary contact 2 (as shown in fig. 4), the three-position disconnecting and grounding switch 300 is in the disconnecting and closing position; when the movable contact 9 is engaged with the second stationary contact 4 (as shown in fig. 5), the three-position disconnecting and grounding switch 300 is in a grounding switch-on position; when the movable contact 9 is parallel to the conductive support 6 (i.e., disconnected from both the first stationary contact 2 and the second stationary contact 4, as shown in fig. 3), the three-position isolation grounding switch 300 is in the isolation/grounding disconnecting position.

Further, the first stationary contact 2 may be connected to a live bus outside the housing 3, the second stationary contact 4 may be grounded, and the conductive support 6 may be connected to a device to be powered outside the housing 3 via the insulating tub 10. Therefore, when the moving contact 9 is connected with the first stationary contact 2, the live bus can supply power to the equipment to be powered through the three-position isolation grounding switch 300; when the moving contact 9 is connected with the second stationary contact 4, the live bus can be electrically isolated from the equipment to be powered, and the equipment to be powered is grounded; when the movable contact 9 is parallel to the conductive support 6 (i.e. disconnected from both the first stationary contact 2 and the second stationary contact 4), the live bus can be electrically isolated from the device to be powered and the device to be powered is not grounded.

Thus, the three-position isolating grounding switch 300 according to the embodiment of the application can be flexibly switched between the isolating switch and the grounding switch. Also, the three-position disconnecting ground switch 300 can satisfy the miniaturization requirement by using the disconnecting switch base 100 having a stable and compact structure.

In the present application, when only one of the conductive support 6 and the first stationary contact 2 and the second stationary contact 4 is connected to the external live bus and the device to be powered, respectively (i.e., grounding is omitted at this time), the three-position disconnecting and grounding switch 300 can be used as a single-break disconnecting switch. For example, the first stationary contact 2 may be connected to a live bus outside the housing 3, the first connection portion 6A of the conductive support 6 may be connected to a device to be powered outside the housing 3, and the second stationary contact 4 is not connected to a device outside the housing 3, or the second stationary contact 4 and the corresponding insulating tub 5 are shielded with an insulator.

Therefore, the isolating switch base according to the embodiment of the application can be used for realizing an expected double-break isolating switch, a three-station isolating grounding switch and a single-break isolating switch by combining different moving contacts and different electric connection modes, so that the isolating switch base can be suitable for various different use scenes.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (15)

1. Disconnector base for gas-insulated metal-enclosed switchgear, characterized in that the disconnector base (100) comprises:

a housing (3);

a first stationary contact (2) and a second stationary contact (4) oppositely disposed on an inner surface of the housing (3); and

an electrically conductive support (6) mounted within the housing (3) and having a first connection portion (6A) and a second connection portion (6B), the first connection portion (6A) being located on the inner surface of the housing (3) and between the first stationary contact (2) and the second stationary contact (4) on the inner surface,

wherein the second connecting portion (6B) is located in the center of the housing (3) and is connected to a movable contact (9) such that the movable contact (9) can rotate around the center of the second connecting portion (6B) to engage with or disengage from the first stationary contact (2) and/or the second stationary contact (4).

2. The disconnector base of claim 1, characterized in that the movable contact (9) rotates around the centre of the second connection portion (6B) to be parallel to the conductive support (6), or perpendicular to the conductive support (6).

3. The disconnector base of claim 1, characterized in that the first stationary contact (2) and the second stationary contact (4) are arranged symmetrically with respect to the electrically conductive support (6).

4. The disconnector base of any one of claims 1 to 3, characterized in that a guide ring (7) and a spring contact finger (8) are provided in the second connection portion (6B) of the electrically conductive support (6), the second connection portion (6B) being connected to the movable contact (9) via the guide ring (7) and the spring contact finger (8).

5. The disconnector base of any one of claims 1 to 3, characterized in that each of the first stationary contact (2), the second stationary contact (4), and the electrically conductive support (6) is mounted to the housing (3) via an insulating basin so as to be able to be in electrical communication with the outside of the housing (3).

6. A disconnector base according to any one of claims 1 to 3, characterized in that the housing (3) has an axisymmetric shape.

7. Double fracture isolator, its characterized in that includes:

the disconnector base (100) of any one of claims 1 to 6;

a movable contact (9) connected to a second connection portion (6B) of the conductive support (6) of the disconnector base (100) to rotate around the center of the second connection portion (6B); and

a drive mechanism (13) connected to the movable contact (9) and configured to: the moving contact (9) is driven to rotate, so that the moving contact (9) is simultaneously jointed with the first static contact seat (2) and the second static contact seat (4), or the moving contact (9) is simultaneously disconnected with the first static contact seat (2) and the second static contact seat (4).

8. Double break disconnector according to claim 7, characterized in that said movable contact (9) has a length greater than the distance between said first stationary contact (2) and said second stationary contact (4).

9. The double break disconnector according to claim 7, characterized in that said double break disconnector is in the open position when said movable contact (9) is parallel to said conductive support (6); when the moving contact (9) is perpendicular to the conductive support (6), the double-fracture isolating switch is in a switching-on position.

10. Double break disconnector according to any of claims 7-9, characterized in that one of said first stationary contact holder (2) and said second stationary contact holder (4) is connected to a live bus outside the housing (3), and the other of said first stationary contact holder (2) and said second stationary contact holder (4) is connected to a device to be powered outside the housing (3).

11. Three station isolation earthing switch, its characterized in that includes:

the disconnector base (100) of any one of claims 1 to 6;

a movable contact (9) connected to a second connection portion (6B) of the conductive support (6) of the disconnector base (100) to rotate around the center of the second connection portion (6B); and

a drive mechanism (13) connected to the movable contact (9) and configured to: the movable contact (9) is driven to rotate, so that the movable contact (9) is only connected with the first stationary contact (2), only connected with the second stationary contact (4), or disconnected with both the first stationary contact (2) and the second stationary contact (4).

12. The three-position isolating earthing switch of claim 11, characterized in that the length of said movable contact (9) is smaller than the distance between said first stationary contact (2) and said second stationary contact (4).

13. The three-position disconnecting and grounding switch according to claim 11, wherein when said movable contact (9) is engaged with only one of said first stationary contact (2) and said second stationary contact (4), said three-position disconnecting and grounding switch is in an disconnecting and closing position; when the movable contact (9) is only jointed with the other one of the first static contact seat (2) and the second static contact seat (4), the three-position isolation grounding switch is in a grounding switch-on position; when the moving contact (9) is disconnected with the first static contact seat (2) and the second static contact seat (4), the three-position isolation grounding switch is in a brake separating position.

14. Three-position disconnecting earthing switch according to any of claims 11 to 13, characterized in that one of said first stationary contact base (2) and said second stationary contact base (4) is connected to a live bus outside the housing (3) and the other of said first stationary contact base (2) and said second stationary contact base (4) is earthed.

15. Three-position isolating earthing switch according to any of claims 11 to 13, characterized in that the first connection portion (6A) of the electrically conductive support (6) is connected to the equipment to be powered outside the housing (3).

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