CN117316694A

CN117316694A - High-voltage switchgear interlocking mechanism and high-voltage switchgear

Info

Publication number: CN117316694A
Application number: CN202210699398.7A
Authority: CN
Inventors: 仲鹏; 吴浩; 张保义; 史书轩
Original assignee: ABB Schweiz AG
Current assignee: ABB Schweiz AG
Priority date: 2022-06-20
Filing date: 2022-06-20
Publication date: 2023-12-29

Abstract

Embodiments of the present disclosure relate to a high voltage switchgear interlock mechanism and a high voltage switchgear. The high voltage switchgear interlock mechanism includes a first interlock member, a second interlock member, and a door lock member. The first interlock member is coupled to the ground operating shaft and moves in response to the ground operating shaft rotating. The second interlock component is coupled to the selector and moves based on a change in state of the selector. The door lock member is coupled to a cabinet door of the ring main unit and, in response to the cabinet door being opened, prevents movement of the first and second interlock members through the first and second intersection points at the first and second intersection points, respectively, that are capable of abutting the first and second interlock members, such that the selector prevents rotation of the ground operating shaft from the ground position and prevents rotation of the isolation operating shaft from the split-gate position. In this way, the ground operating shaft and the selector cannot be operated by interlocking the door lock member with the first interlocking member and the second interlocking member when the cabinet door is opened, thereby avoiding erroneous operation when the cabinet door is opened.

Description

High-voltage switchgear interlocking mechanism and high-voltage switchgear

Technical Field

Embodiments of the present disclosure relate generally to the field of electrical, and more particularly, to a high voltage switchgear interlock mechanism and a high voltage switchgear.

Background

High voltage switchgear generally refers to electrical equipment with an operating voltage above 3.6 kV. For example, the ring main unit is a group of high-voltage electrical equipment in which the high-voltage switching device is installed in the metal main unit or made into an assembled and spaced ring main unit. The ring main unit is an important switch device for ring network power supply and terminal power supply. With the development of technology, the two independent components of the isolating switch and the grounding switch in the high-voltage switch device can be combined into one isolating/grounding switch three-station combined component, namely a three-station switch. The drive mechanism for driving the three-position switch is commonly referred to as a three-position mechanism. The three stations refer to three working positions: 1. a closing position of the isolating switch, a separating position of the isolating switch, a grounding position of the grounding side. The three-position switch is usually completed by one knife, thereby realizing mechanical locking and avoiding the possibility of misoperation.

Since high voltage switchgear is typically used in a high voltage environment, safety regulations are put forward on its use. For example, in some standards it is required that the grounding switch cannot be operated when the disconnector is in the closed position, but that the grounding switch is operated to be closed only when the disconnector is in the open position. Likewise, the isolating switch can be operated to close only when the grounding switch is in the opening position. Conventionally, to meet this requirement on the same mechanism, it is necessary to achieve interlocking between the manual and electrically operated disconnectors and the manual and electrically operated earthing switches. Therefore, how to make three-position switch and cabinet door more effective to meet protection requirements is a challenge facing the designer.

Disclosure of Invention

Embodiments of the present disclosure provide a high voltage switchgear interlock device that is intended to overcome at least the problems of the prior art.

A first aspect of the present disclosure relates to a high voltage switchgear interlock. The high-voltage switchgear interlock includes a first interlock component coupled to a ground operating shaft and configured to move in response to rotation of the ground operating shaft, the ground operating shaft configured to rotate to ground or ungrounded the ring main unit; a second interlock component coupled to the selector and configured to move based on a change in state of the selector; and a door lock member coupled to a cabinet door of the ring main unit and configured to prevent the first and second interlocking members from moving through the first and second intersection points at the first and second intersection points respectively abuttable with the first and second interlocking members in response to the cabinet door being opened, such that the selector prevents the ground operating shaft from rotating away from the ground position and prevents the isolation operating shaft from rotating away from the open position, the isolation operating shaft configured to rotate to turn the ring main unit on or off.

According to an embodiment of the present invention, in the high voltage switchgear interlock apparatus, there are provided a first interlock part movable in response to rotation of the ground operation shaft, a second interlock part movable in response to a change in state of the selector, and a door lock part movable in response to opening and closing of the cabinet door. The movement paths of the first interlocking part and the second interlocking part intersect with the movement path of the door lock part at a first intersection point and a second intersection point, respectively. The movement of the door lock member can be restricted when the first interlocking member and the second interlocking member are located at the intersection point, and the movement of the first interlocking member and the second interlocking member can be restricted when the door lock member is located at the intersection point. Thereby, an interlocking between the first and second interlocking parts and the door lock part is achieved, whereby an interlocking between the ground operating shaft, the selector and the cabinet door, respectively, associated with their movements is achieved. Specifically, when the cabinet door is opened, the door lock member prevents movement of the first interlocking member and the second interlocking member at the first intersection point and the second intersection point, so that the ground operating shaft and the selector are locked in a state before the cabinet door is opened. In this way, the safety of the cabinet door when open is ensured.

Here, the state change of the selector may refer to a change in its position or a change in direction. The selector may include three predetermined states, i.e., a state in which the rotation of the ground operating shaft is prevented and the rotation of the insulating operating shaft is allowed, a state in which the rotation of the insulating operating shaft is prevented and the rotation of the ground operating shaft is allowed, and a state in which the rotation of the insulating operating shaft and the rotation of the ground operating shaft are prevented.

In some embodiments, the door lock component is further configured to remain stationary with the cabinet door in response to the cabinet door being closed. In such embodiments, failure of the interlock due to movement of the door lock member affecting movement of the interlock member can be avoided by disabling movement of the door lock member when the door is closed.

In some embodiments, the first interlock component is configured to move past the first intersection in response to the door lock component remaining stationary with the cabinet door, thereby preventing the door lock component from moving to the first intersection to limit opening and closing of the cabinet door. In such an embodiment, the movement path of the door lock member is blocked at the first intersection point by moving the first interlocking member through the first intersection point, thereby preventing the door lock member from moving to or through the first intersection point. The door lock component can limit the movement of the cabinet door, so that the limitation of the cabinet door switch is realized.

In some embodiments, the second interlock component is configured to move past the second intersection in response to the door lock component remaining stationary with the cabinet door, thereby preventing the door lock component from moving to the second intersection to limit opening and closing of the cabinet door. Similarly, in such embodiments, the movement path of the door lock member is blocked at the second intersection point by moving the second interlock member through the second intersection point, thereby preventing the door lock member from moving to or through the intersection point. The door lock component can limit the movement of the cabinet door, so that the limitation of the cabinet door switch is realized. Furthermore, by providing two interlocking parts, which can independently realize the restriction of the door lock parts, the adaptation to different operating phases is improved, so that the safety guarantee can be improved for all operating phases.

In some embodiments, the first and second interlocking members are configured to move in parallel directions. In some embodiments, the first path and the second path may extend side-by-side. In such an embodiment, the first and second interlocking members may be moved at the same angle due to the parallel movement paths of the first and second interlocking members, thereby simplifying the interlocking design of the door locking member and the interlocking member. Further, in some embodiments, the first path is adjacent to the second path such that the first intersection is adjacent to the second intersection, further simplifying the design. In this way, the interlocking member and the door lock mechanism can be made more compact as a whole.

It should be appreciated that the path of movement of the interlocking and door lock components may be a straight path or an arcuate path. For example, the arcuate path may be formed by guidance of an arcuate track. The shape of the path may be set according to the space in the cabinet and the relative positions of the components.

In some embodiments, the door lock component includes a first slider slidably disposed in the high voltage switchgear and connected to a first reset secured in the high voltage switchgear, the first reset configured to pull the first slider to move to the first intersection point and the second intersection point in response to the door opening. In such an embodiment, the first slider is pulled by the first return member (e.g. spring) to the first and second intersection point after the absence of the pressure exerted by the door, such that an automatic restriction of the movement of the first and second interlocking parts by the door lock part is achieved.

In some embodiments, the first slider comprises a groove and the door comprises a tab configured to snap into the groove to close the door. In such an embodiment, the relative restriction of the door and the door lock member is achieved by the engagement of the projection with the recess, such that the door lock member can prevent the door from being opened when being abutted by the interlocking member, and can prevent the door lock member from being moved when the door is closed.

In some embodiments, the first interlocking part comprises a second slider which is slidingly arranged in the high-voltage switching device and is connected to the ground operating shaft via a first transmission, the second slider being connected to a second reset element fixed in the high-voltage switching device. In such an embodiment, by providing the first transmission mechanism and the second return member, the linkage of the second slider with the ground operation shaft is achieved.

In some embodiments, the second slide is configured to be moved away from the first intersection by the first transmission mechanism in response to rotation of the ground operating shaft to the ground position to allow the door lock component to move to the first intersection. In such an embodiment, the second slider is moved away from the first intersection point when the ground operating shaft is in the ground position, releasing the restriction on the movement of the door lock member.

In some embodiments, the second slider is further configured to be moved by the second reset member past the first intersection point in response to rotation of the ground engaging operating shaft to the ground release position to prevent movement of the door lock member to the first intersection point. In such an embodiment, the second slider moves past the first intersection when the ground operating shaft is in the ground release position, limiting movement of the door lock member, thereby ensuring that the cabinet door cannot be opened in the high voltage switchgear in the non-grounded state.

In some embodiments, the first transmission includes: a cam provided at an outer periphery of the ground operation shaft and configured to rotate with the ground operation shaft; a pivot arm configured to abut the cam and pivot in response to cam rotation; and a traction member having one end coupled with the pivot arm and the other end coupled with the second slider. In such an embodiment, the cam rotates together, for example, during rotation of the ground operating shaft, and the pivot arm is always in abutment with the cam, and thus will be pushed to pivot when in abutment with the protruding portion of the cam. At the same time, as the pivot arm pivots, the traction member will be pulled, causing the traction member to pull the second slider. In this way, the linkage of the second slider with the ground operation shaft is achieved.

In some embodiments, the second interlock component includes a third slider slidably disposed in the high voltage switchgear and connected to the selector via a second transmission. In such an embodiment, by providing a slide, the mobility of the second interlocking part is achieved, and the sliding can be achieved in a variety of ways, increasing the flexibility of the design.

In some embodiments, the third slider is configured to be moved away from the second intersection by the second transmission mechanism to allow the door lock member to move to the second intersection in response to the selector changing to a state that prevents rotation of the ground operating shaft and the isolation operating shaft. In such an embodiment, in a state where the selector prevents the ground operation shaft and the isolation operation shaft from being operated at the same time, it is ensured that the ground operation shaft and the gate operation shaft cannot be operated, at which time the door lock member is allowed to move to release the restriction of the cabinet door.

In some embodiments, the third slider is further configured to be moved by the second transmission mechanism to a second intersection point to prevent movement of the door lock component past the second intersection point in response to the selector changing to a state that prevents rotation of the isolation operating shaft. In such an embodiment, in a state where the selector prevents the rotation of the isolation operating shaft while allowing the rotation of the ground operating shaft, it is necessary to ensure that the door is not opened, and therefore the slider moves through the second intersection to restrict the movement of the door lock member, thereby preventing the door from opening.

In some embodiments, the second transmission includes: a rotation shaft coupled to the selector and configured to rotate in response to a state change of the selector; and a toggle lever coupled to the rotation shaft and configured to pivot in response to rotation of the rotation shaft to toggle the third slider. In such an embodiment, as the state of the selector changes, the shaft coupled thereto rotates in response to the state change, thereby driving the lever coupled to the shaft. At this time, the shift lever pivots about the rotation axis to shift the third slider to move through the second intersection point or to move away from the second intersection point. In this way, the linkage of the third slider with the selector is achieved.

In some embodiments, the high voltage switching device further comprises: a motor configured to operate the ground operation shaft and the isolation operation shaft; and a motor switch coupled to the motor and disposed in a moving path of the door lock part. In such an embodiment, the ground operation shaft and the isolation operation shaft of the high-voltage switching device can also be operated by the motor to achieve the ground operation and the opening and closing operation. By providing a motor switch for controlling the power supply of the motor in the movement path of the door lock member, the motor switch can be controlled by the movement of the door lock member.

In some embodiments, the motor switch is configured to be operated by the door lock component to prevent the motor from being powered in response to the door opening. In such an embodiment, safety is improved by preventing the motor from being energized to avoid any manipulation of the operating shaft when the door is opened.

In some embodiments, the motor switch is configured to be operated by the door lock component in response to closing of the cabinet door to allow the motor to be powered. In such an embodiment, once the door is confirmed to be closed, the motor may be allowed to be energized, so that the operating shaft can be normally operated with the motor.

It will be appreciated that the high voltage switching device or interlock mechanism may comprise one motor for controlling both operating shafts, or may comprise two motors for controlling one operating shaft separately.

A second aspect of the present disclosure relates to a high voltage switchgear. The high voltage switching device comprises a three-position mechanism adapted to drive a three-position switch. The three-station mechanism comprises: the grounding operation shaft is configured to rotate to ground or ungrounded the high-voltage switching device; and the isolation operation shaft is configured to rotate to turn on or off the high voltage switching device. The high voltage switching device further includes: a selector configured to change, in response to an operation, between a state in which at least one of the ground operation shaft and the isolation operation shaft is blocked; a cabinet door adapted to be installed at a cable compartment of the high voltage switchgear; an interlock mechanism. The interlocking mechanism includes: a first interlocking member coupled to the ground operating shaft and configured to move in response to the ground operating shaft rotating; a second interlock component coupled to the selector and configured to move based on a change in state of the selector; and a door lock member coupled to the cabinet door and configured to prevent the first and second interlocking members from moving through the first and second intersection points at the first and second intersection points respectively abuttable with the first and second interlocking members in response to the cabinet door being opened, such that the selector prevents the ground operating shaft from rotating away from the ground position and the isolation operating shaft from rotating away from the break-in position.

In some embodiments, the door lock component is further configured to remain stationary with the door in response to the door being closed, wherein the first interlocking component is configured to move through a first intersection in response to the door lock component remaining stationary with the door to limit movement of the door lock component to limit opening and closing of the door, and/or the second interlocking component is configured to move through a second intersection in response to the door lock component remaining stationary with the door to limit movement of the door lock component to limit opening and closing of the door.

In some embodiments, the first and second interlocking members are configured to move in parallel directions.

In some embodiments, the door lock assembly includes: a first slider slidably disposed in the high voltage switchgear and connected to a first reset member fixed in the high voltage switchgear, the first reset member configured to pull the first slider to move to a first intersection point and a second intersection point in response to the door opening.

In some embodiments, the first slider comprises a groove, and the door comprises a tab configured to snap into the groove to close the door.

In some embodiments, the first interlock component includes a second slider slidably disposed in the high voltage switchgear and connected to the ground operating shaft via a first transmission mechanism, the second slider being connected to a second reset member fixed in the high voltage switchgear, wherein the second slider is configured to be moved away from the first intersection by the first transmission mechanism in response to rotation of the ground operating shaft to the ground position to allow the door lock component to move to the first intersection, and/or the second slider is configured to be moved past the first intersection by the second reset member in response to rotation of the ground operating shaft to the ground release position to prevent the door lock component from moving to the first intersection.

In some embodiments, the first transmission includes: a cam provided at an outer periphery of the ground operation shaft and configured to rotate with the ground operation shaft; a pivot arm configured to abut the cam and pivot in response to cam rotation; and a traction member having one end coupled with the pivot arm and the other end coupled with the second slider.

In some embodiments, the second interlock component includes a third slider slidably disposed in the high voltage switchgear and connected to the selector via a second transmission mechanism, wherein the third slider is configured to be moved away from the second intersection by the second transmission mechanism to allow the door lock component to move to the second intersection in response to the selector changing to a state that prevents rotation of the ground operating shaft and the isolation operating shaft, and/or to be moved to the second intersection by the second transmission mechanism to prevent the door lock component from moving through the second intersection in response to the selector changing to a state that prevents rotation of the isolation operating shaft.

In some embodiments, the second transmission includes: a rotation shaft coupled to the selector and configured to rotate in response to a state change of the selector; and a toggle lever coupled to the rotation shaft and configured to pivot in response to rotation of the rotation shaft to toggle the third slider.

In some embodiments, the interlock mechanism further comprises: a motor configured to operate the ground operation shaft and the isolation operation shaft; and a motor switch coupled to the motor and disposed in a movement path of the door lock member, wherein the motor switch is configured to be operated by the door lock member to prevent the motor from being powered in response to the door opening, and/or the motor switch is configured to be operated by the door lock member to allow the motor to be powered in response to the door closing.

The description of the first aspect of the present disclosure and its advantages are equally applicable to the relevant components of the second aspect.

Drawings

The above and other objects, features and advantages of embodiments of the present disclosure will become more readily apparent from the following detailed description with reference to the accompanying drawings. Embodiments of the present disclosure will now be described, by way of example and not limitation, in the figures of the accompanying drawings, in which:

1A-1D illustrate partial schematic views of a high voltage switchgear in accordance with an exemplary embodiment of the present disclosure at multiple viewing angles before opening a cabinet door;

2A-2D illustrate partial schematic views of a plurality of view angles of a selector of a high voltage switching device according to one exemplary embodiment of the present disclosure after being operated;

3A-3C illustrate partial cross-sectional views of a high voltage switching device according to one exemplary embodiment of the present disclosure at multiple perspectives after a ground operating shaft is operated;

4A-4D illustrate partial schematic views of a high voltage switching device at multiple viewing angles when a selector is reset, according to one exemplary embodiment of the present disclosure; and

fig. 5A-5B illustrate partial schematic views of a high voltage switchgear according to an exemplary embodiment of the present disclosure at various viewing angles when a cabinet door is open.

Detailed Description

The principles of the present disclosure will now be described with reference to various exemplary embodiments shown in the drawings. It should be understood that these embodiments are merely provided to enable those skilled in the art to better understand and further practice the present disclosure and are not intended to limit the scope of the present disclosure in any way. It should be noted that similar or identical reference numerals may be used, where possible, in the figures and similar or identical reference numerals may designate similar or identical functions. Those skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

As used herein, the term "comprising" and variants thereof are to be construed as meaning open-ended terms including, but not limited to. The term "based on" will be read as "based at least in part on". The terms "one embodiment" and "an embodiment" should be understood as "at least one embodiment". The term "another embodiment" should be understood as "at least one other embodiment". The terms "first," "second," and the like, may refer to different or the same object. Other explicit and implicit definitions may be included below. Unless the context clearly indicates otherwise, the definition of terms is consistent throughout the specification.

As discussed above, the interlocking of the three-position mechanism with the cabinet door should be provided in a high voltage switchgear, such as a ring main unit, to improve safety. According to the standard, the cabinet door should not be opened during the operation of the three-position mechanism, and the cabinet door can be opened only if it is confirmed that the three-position mechanism is grounded while the operation shaft can no longer be operated. After the cabinet door is opened, the operation shafts of the three-station mechanism are not allowed to operate.

Although the existing interlocking device can realize a certain degree of interlocking, the safety of the existing interlocking device is still insufficient. For example, the existing interlocking device does not have a reverse interlocking function, that is, after the cabinet door is opened, the operation shafts cannot be guaranteed not to be operated, at this time, due to the opening of the cabinet door, a user may still operate each operation shaft in the cabinet door by mistake, which easily causes operation risks. In this regard, the present disclosure provides an interlocking structure of a three-position mechanism and a cabinet door. The interlocking component and the door lock component which are respectively linked with the three-station mechanism and the cabinet door are arranged, and the moving paths of the interlocking component and the door lock component are intersected, so that various mutual constraint mechanisms can be realized, and the comprehensive interlocking mechanism in each operation stage can be realized, so that misoperation is avoided. The opening process of the cabinet door of the high voltage switchgear according to the exemplary embodiment of the present disclosure and the interlocking mechanism at each stage will be described below with reference to fig. 1A to 5B.

Fig. 1A to 1D show a partial schematic view of a high-voltage switching apparatus before opening a cabinet door according to an exemplary embodiment of the present disclosure, wherein fig. 1A shows a schematic view of a portion including a three-position mechanism 10, fig. 1B shows a schematic view of a portion including a three-position mechanism 10 after removing a selector 20, fig. 1C shows a partial schematic view of a portion including a three-position mechanism 10 from a side rear view, and fig. 1D shows a top view of a portion including an interlocking member. Before the cabinet door is opened, the three-station mechanism is in a brake separating position and needs to be grounded. As shown in fig. 1A, the high voltage switchgear includes a three-position mechanism 10. In this embodiment, the three-position mechanism 10 includes a ground operation shaft 11 and an isolation operation shaft 12 (not shown) as input shafts. An operation panel 30 is provided on the side of the three-position mechanism 10 facing the outside of the high-voltage switchgear. Two operation holes 31, 32 are opened on the operation panel 30, and the positions of the operation holes 31, 32 correspond to the ground operation shaft 11 and the isolation operation shaft 12, respectively, to allow an operator to extend the handles into the corresponding operation holes 31, 32 to achieve the operations of the ground operation shaft 11 and the isolation operation shaft 12. The selector 20 is provided on the operation panel 30. The selector 20 includes an operation lever 21 and a shutter 22. The operation lever 21 is configured to move along a guide rail 33 provided on the operation panel 30 in response to being operated. When the operation lever 21 moves along the guide rail 33, the shutter 22 connected to the operation lever 21 moves together. As shown in fig. 1A, the operation lever 21 is located in the middle of the guide rail, and the shutter 22 simultaneously blocks the operation holes of the ground operation shaft 11 and the isolation operation shaft 12, i.e., the selector 20 is in a state of simultaneously preventing the rotation of the ground operation shaft 11 and the isolation operation shaft 12. When the operation lever 21 moves in the forward direction (as indicated by the arrow in the figure) in the X direction shown in fig. 1A, the shutter 22 moves to give way to the operation hole 31 of the ground operation shaft 11 and continues to block the operation hole 32 of the isolation operation shaft 12, i.e., the selector 20 is in a state of blocking the isolation operation shaft 12. Correspondingly, when the operation lever 21 is moved in the reverse direction of the X direction (direction opposite to the arrow direction), the shutter 22 is moved to open the operation hole of the isolation operation shaft 12 and continue to block the operation hole of the ground operation shaft 11, that is, the selector 20 is in a state of blocking the ground operation shaft 11.

As shown in fig. 1B, a first interlocking member 30 and a second interlocking member 40 are provided below the three-position mechanism 10. A cabinet door 60 is also provided on the same side of the high voltage switchgear as the three-position mechanism 10 for protecting various electrical devices inside the high voltage switchgear and needs to be opened when the high voltage switchgear is maintained. The cabinet door 60 is movable in the Z direction and opens in the Y direction after the reverse direction of the Z direction reaches the highest point. It should be understood that the cabinet door 60 described in this embodiment is only exemplary, and the technical solution of the present disclosure is equally applicable to cabinet doors that are opened and closed in other ways.

In the illustrated embodiment, the first interlocking member 30 may be coupled with the ground operating shaft 11 via a first transmission mechanism 70. The first transmission mechanism 70 includes a cam 71 that is provided at the outer periphery of the ground operation shaft 11 and is configured to rotate with the ground operation shaft 11. The first transmission 70 further includes a pivot arm 72, the pivot arm 72 being rotatable about a pivot axis 74. As shown in fig. 1B, the pivot arm 72 may abut the cam 71 and be able to pivot about the pivot shaft 74 as the cam 71 rotates. For example, when the cam 71 rotates in the clockwise direction, the pivot arm 72 is pushed by the cam 71 to pivot in a direction away from the ground operating shaft 11. In addition, the first transmission mechanism 70 further includes a traction member 73, one end 731 of the traction member 73 being coupled to the free end 721 of the pivot arm 72, and the other end 732 of the traction member 73 being coupled to the first interlocking part 30. As the pivot arm 72 pivots, the traction member 73 pulls the first interlock 30 with the pivoting of the pivot arm 72. In some embodiments, the pulling member 73 may be a flexible cable. In some embodiments, the pulling member 73 may also be a rigid cable.

As shown in fig. 1B, the second interlock component 40 may be coupled with the selector 20 via a second transmission mechanism 80. The second transmission mechanism 80 includes a rotation shaft 81. In the embodiment shown in fig. 1B, the shaft 81 extends generally in the Y-direction and is coupled to the selector 20 by a certain transmission. It should be appreciated that the shaft 81 may be through any transmission mechanism capable of implementing the linkage mechanism described in this disclosure. The rotation shaft 81 may be used to rotate as the state of the selector 20 changes. For example, when the selector 20 is changed from a state in which the ground operation shaft 11 and the isolation operation shaft 12 are simultaneously blocked to a state in which the isolation operation shaft 12 is blocked, the rotation shaft 80 rotates in the counterclockwise direction. The second transmission 80 also includes a lever 82. A toggle lever 82 is coupled to the rotation shaft 81 and is pivotable with the rotation of the rotation shaft 81 to toggle the second interlock component 40. In the embodiment shown in fig. 1B, an open slot 42 is provided in the second interlocking part 40 at a position corresponding to the lever 82, and the lever 82 protrudes into the open slot 42 and is in a vertical state. When the lever 82 pivots about the shaft 81, the sidewall of the lever 82 abuts against the wall of the open slot 42 to toggle the second interlock component 40.

Fig. 1C shows a detailed structure of the first interlocking part 30, the second interlocking part 40 and the door lock part 50. The first interlocking part 30 comprises a second slider 31. The second slider 31 is slidably disposed over the frame of the cabinet door 60 in the X direction. The second interlocking part 40 comprises a third slide 41. The third slider 41 is slidably disposed above the frame of the cabinet door 60 in the X direction and is disposed side by side with the second slider 31 so that the first slider 51 can simultaneously abut against the third slider 41 and the second slider 31 at the same position of its moving path. In this way, the structure can be made more compact. The door lock member 50 includes a first slider 51. The first slider 51 is slidably disposed in the high-voltage switching device and is connected to a first reset member 91 fixed in the high-voltage switching device. The first restoring member 91 is configured to pull the first slider 51 in a reverse direction of the Z-direction in response to the cabinet door 60 being opened. In some embodiments, the first restoring member 91 may be an extension spring, one end of which is fixedly connected in the high voltage switching device, and the other end of which is coupled with the first slider 51. The first slider 51 includes a groove 52. The cabinet door 60 includes a door panel 62 and a protrusion 61 provided at an edge of the door panel 62. The projection 61 is configured to snap into the recess 52 to achieve mutual confinement of the cabinet door 60 and the first slider 51. As shown in fig. 1C, the second slider 31 is now located above the first slider 51. That is, the second slider 31 moves in the X direction through an overlapping portion (also referred to as a first intersection point) of the movement path thereof and the movement path of the first slider 51, thereby restricting the reverse movement of the first slider 51 in the Z direction, while the first slider 51 restricts the reverse movement of the cabinet door 60 in the Z direction by the snap-fit, so that the cabinet door 60 cannot be opened.

As shown in fig. 1D, the second slider 31 is coupled with a second reset member 92 fixed to the high voltage switching device. The second slider 31 moves forward in the X direction through the intersection plane Y where the first intersection point is located, above the first slider 51, by the pull of the second return member 92, which means that the second slider 31 has moved onto the movement path of the first slider 51 at this time, thereby preventing the movement of the first slider 51. At this time, the third slider 41 does not pass through the intersection plane a, which means that the third slider 41 does not move onto the movement path of the first slider 51 at this time, and therefore, the restriction of the movement of the first slider 51 is not caused.

Before the cabinet door 60 is to be opened, the grounding operation shaft 11 is located at the ground release position, and at this time, the cabinet door 60 cannot be opened because the second sliding member 31 of the first interlocking member 30 is located above the first sliding member 51 all the time, so that the safety during the switching-on and switching-off operation of the high-voltage switch device is ensured. In order to open the cabinet door 60, a grounding operation is required, and first the selector 20 is operated to allow the grounding operation shaft 11 to be operated. The operation of the selector 20 will be described in detail below with reference to fig. 2A to 2D. Hereinafter, for the sake of brevity, the same components will not be described in detail later.

Fig. 2A to 2D illustrate partial schematic views of a plurality of views after the selector 20 of the high-voltage switching apparatus according to an exemplary embodiment of the present disclosure is operated, wherein fig. 2A illustrates an end view schematic diagram of a portion including the three-position mechanism 10, fig. 2B illustrates a cross-sectional schematic diagram of a portion including the three-position mechanism 10, fig. 2C illustrates a partial schematic diagram of a portion including the three-position mechanism 10 viewed from a side rear view, and fig. 2D illustrates a top view schematic diagram of a portion including an interlocking member. In order to be able to operate the ground operating shaft 11, the operating lever 21 is pushed to a state that prevents the rotation of the insulating operating shaft 12 and allows the rotation of the ground operating shaft 11. The lever 82 of the second transmission mechanism 80 is pivotable in the counterclockwise direction from the vertical direction as the state of the selector 20 changes.

As shown in fig. 2B, the rotation shaft 81 rotates in the counterclockwise direction in response to the state change of the selector 20. The lever 82 pivots in a counterclockwise direction about the rotation shaft 81 in response to the rotation of the rotation shaft 81 to toggle the third slider 41. The third slider 41 moves through a first intersection point where it can abut against the first slider 51, that is, a position where the movement path of the third slider 41 overlaps with the movement path of the first slider 51, and reaches above the first slider 51. At this time, the ground operation shaft 11 is located at the ground release position, and the first rotating mechanism 70 has not pulled the second slider 31 yet.

As shown in fig. 2C, with the second slider 31, similarly to the case of fig. 1C, the second slider 31 is located above the first slider 51 and prevents the movement of the first slider 51. As for the third slider 41, it moves in the X direction through the overlapping portion (also referred to as a second intersection point) of the movement path thereof and the movement path of the first slider 51, so that the reverse movement of the first slider 51 in the Z direction can also be restricted, while the reverse movement of the cabinet door 60 in the Z direction is restricted by the first slider 51 by the snap fit, so that the cabinet door 60 cannot be opened.

As shown in fig. 2D, the third slider 41 moves forward in the X direction through the intersection plane a where the second intersection is located, to reach above the first slider 51. This means that the third slider 41 has now moved onto the path of movement of the first slider 51, thereby preventing movement of the first slider 51. At this time, both the second slider 31 and the third slider 41 move through the intersection plane a, which means that both the second slider 31 and the third slider 41 move onto the movement path of the first slider 51 at this time, thus simultaneously causing restriction of the movement of the first slider 51.

By operating the selector 20 such that the third slider 41 restricts the movement of the first slider 51, it is ensured that the third slider 41 is always above the first slider 51 and restricts the movement of the first slider 51 when the ground operation shaft 11 is operated later, so that the cabinet door 60 cannot be opened, providing safety assurance for the ground operation shaft 11 to be operated later. Accordingly, the ground operating shaft 11 can be safely operated with the cabinet door 60 kept closed, thereby ensuring safety of the high-voltage switching apparatus and the operator. The operation of the ground operation shaft 11 will be described in detail below with reference to fig. 3A to 3C.

Fig. 3A to 3C illustrate partial schematic views of a high voltage switching apparatus according to an exemplary embodiment of the present disclosure at a plurality of viewing angles after the ground operation shaft 11 is operated, wherein fig. 3A illustrates a sectional schematic view of a portion including the three-position mechanism 10, fig. 3B illustrates a partial schematic view of a portion including the three-position mechanism 10 viewed from a side rear viewing angle, and fig. 3C illustrates a top schematic view of a portion including an interlocking part. As shown in fig. 3A, the ground operation shaft 11 is rotatable in a clockwise direction by a user operation such that the outer peripheral cam 71 provided on the ground operation shaft 11 rotates in the clockwise direction with the ground operation shaft 11. The pivot arm 72 abuts against the cam 71, and as the cam 71 rotates clockwise, the pivot arm 72 is urged to pivot about the pivot shaft 74 in the opposite direction of the X direction. As the pivot arm 72 pivots, the traction member 73, to which the free end 721 thereof is connected, moves in the reverse direction of the X direction, thereby pulling the second slider 31 coupled to the other end 732 of the traction member 73.

As shown in fig. 3B, the second slider 31 has moved away from the first intersection point by the pull of the pulling member 73, so that the movement of the first slider 51 is not restricted any more. However, as for the third slider 41, similar to the case of fig. 2C, the third slider 41 is still located above the first slider 51 and restricts the movement of the first slider 51 and the cabinet door 60.

As shown in fig. 3C, the second slider 31 is moved away from the first intersection point in the reverse direction of the X direction by the pulling force of the pulling member 73 exceeding the pulling force of the second restoring member 92. That is, at this time, the second slider 31 does not move on the moving path of the first slider 51, and therefore, the restriction of the movement of the first slider 51 is not caused. In contrast, the third slider 41 is still at a position beyond the intersection plane a, which means that the third slider 41 is moved onto the movement path of the first slider 51 at this time, thus causing restriction of the movement of the first slider 51.

In the case where it is ensured that the third slider 41 is always located above the first slider 51 such that the cabinet door 60 cannot be opened, the user can rotate the ground operation shaft 11 to the ground position, at which time the condition that the cabinet door 60 is opened is satisfied. In order to open the cabinet door 60, the third slider 41 needs to leave the second intersection to release the movement restriction of the first slider 51. The movement of the third slider 41 will be described below with reference to fig. 4A to 4D.

Fig. 4A to 4D illustrate partial schematic views of a high voltage switching apparatus according to an exemplary embodiment of the present disclosure at a plurality of viewing angles when a selector is reset, wherein fig. 4A illustrates an end view schematic diagram of a portion including a three-position mechanism 10, fig. 4B illustrates a cross-sectional schematic diagram of a portion including the three-position mechanism 10, fig. 4C illustrates a partial schematic view of a portion including the three-position mechanism 10 viewed from a side rear view angle, and fig. 4D illustrates a top view schematic diagram of a portion including an interlocking member. In order to remove the third slider 41, the operation lever 21 is pushed to change the selector 20 to a state in which the ground operation shaft 11 and the isolation operation shaft 12 are simultaneously prevented from being operated, that is, the shutter 22 of the selector 20 simultaneously blocks the operation holes of the ground operation shaft 11 and the isolation operation shaft 12. In this case, the lever 82 pivots in a clockwise direction to a vertical position in the embodiment shown in fig. 1A. At this time, the states of the selector 20, the second interlock member 40, and the second transmission mechanism 80 are the same as those of the embodiment shown in fig. 1A.

As shown in fig. 4B, the rotation shaft 81 rotates in the clockwise direction in response to the state change of the selector 20. The lever 82 pivots in a clockwise direction about the rotation shaft 81 in response to the rotation of the rotation shaft 81 to toggle the third slider 41 to move away from the second intersection point to release the movement restriction of the first slider 51.

As shown in fig. 4C, with the second slider 31, similarly to the case of fig. 3B, the second slider 31 is not located above the first slider 51, and thus does not cause restriction of the movement of the first slider 51. As for the third slider 41, similarly to the case of fig. 1C, the third slider 41 is also not located above the first slider 51, and therefore, no restriction is made to the movement of the first slider 51.

As shown in fig. 4D, the reverse movement of the third slider 41 in the X direction is away from the intersection plane a, which means that the third slider 41 is not moved onto the movement path of the first slider 51 at this time, and therefore, the restriction of the movement of the first slider 51 is not caused. At this time, the second slider 31 still does not pass through the intersection plane a, which means that the second slider 31 does not move onto the moving path of the first slider 51 at this time, and therefore, the restriction of the movement of the first slider 51 is not caused.

Thereby, the movement of the first slider 51 in the reverse direction of the Z direction is no longer restricted by the second slider 31 and the third slider 41 from above. Thereby, the restriction of opening the cabinet door 60 is released, and the cabinet door 60 can be opened at this time. The process of opening the cabinet door 60 will be described with reference to fig. 5A to 5B.

Fig. 5A-5B illustrate partial schematic views of a high voltage switchgear according to one exemplary embodiment of the present disclosure at various angles of view when a cabinet door 60 is open. As shown in fig. 5A, the cabinet door 60 moves in the reverse direction in the Z direction, and since the forward pressure in the Z direction applied by the cabinet door 60 is no longer applied, the first slider 51 also moves in the reverse direction in the Z direction by the pull of the first restoring member 91, and at the same time, the forward pressure in the Z direction is no longer applied to the cabinet door 60, so that the cabinet door 60 can move to the outwardly opened position.

As shown in fig. 5B, both the first slider 51 and the cabinet door 60 are moved to the extreme positions in the reverse direction of the Z direction, and the cabinet door 60 can be opened outward in the forward direction of the Y direction.

The first slider 51 moves to the first and second intersection points in response to the door 60 being opened, preventing the second and third sliders 31 and 41 from moving through the first and second intersection points, thereby restricting the ground operating shaft 11 and the selector 20 coupled with the second and third sliders 31 and 41, respectively, the operating lever 21 cannot move forward or backward in the X direction, the shutter 22 blocks the operating holes opening the ground operating shaft 11 and the isolating operating shaft 12, prevents the ground operating shaft 11 from rotating away from the ground position, and prevents the isolating operating shaft 12 from rotating away from the isolating brake separating position.

Corresponding to the opening of the cabinet door 60, the closing operation can be performed under the safety assurance only by performing the steps opposite to those of the embodiment shown in fig. 1A to 5B when closing the cabinet door 60. It should also be noted that, although the steps of operating the high-voltage switchgear are described above substantially in the order of fig. 1A to 5B, this is merely for convenience of description and does not mean that the user must control the operation of the cabinet door 60 of the high-voltage switchgear completely in such order. Further, while specific structures according to embodiments of the present disclosure have been described in connection with the various figures, this is merely illustrative, and in a specific use scenario, these specific structures may be varied depending on space arrangement, cost considerations, and the like, so long as the intended purpose can be achieved.

Additionally or alternatively, in some embodiments, the interlock mechanism of the high voltage switchgear further comprises a motor and a motor switch. The motor is adapted to operate the ground operating shaft and the isolation operating shaft with electric drive. The motor switch is coupled to the motor and is disposed in a moving path of the door lock part. The motor switch is operable by the door lock member moving in the moving path to prevent the motor from being energized when the door is opened. By disabling the motor to any operation of the operating shaft when the door is opened, safety is improved. In addition, the motor switch is also capable of operating the door lock assembly to allow the motor to be energized when the cabinet door is closed. It should be understood that the interlocking mechanism of the high voltage switchgear may comprise one motor for controlling two operating shafts, or may comprise two motors for controlling one operating shaft respectively.

In this way, through the interlocking mechanism in each operation stage, the ring main unit can be ensured to be safely operated in each stage, and the overall safety of the ring main unit is improved.

Although claims have been formulated in this application to particular combinations of features, it should be understood that the scope of the disclosure also includes any novel feature or any novel combination of features disclosed herein either explicitly or implicitly or any generalisation thereof, whether or not it relates to the same in any claim as presently claimed.

Claims

1. A high voltage switchgear interlock mechanism comprising:

a first interlocking part (30) coupled to a ground operation shaft (11) and configured to move in response to rotation of the ground operation shaft (11), the ground operation shaft (11) configured to rotate to ground or ungrounded a high voltage switching device;

a second interlock component (40) coupled to the selector (20) and configured to move based on a change in state of the selector (20); and

a door lock member (50) coupled to a cabinet door (60) of the high voltage switching device and configured to prevent movement of the first and second interlocking members (30, 40) through first and second intersection points at which the first and second interlocking members (30, 40) can abut, respectively, in response to the cabinet door (60) being opened, such that the selector (20) prevents rotation of the ground operating shaft (11) from a ground position and prevents rotation of the isolation operating shaft (12) from a break-gate position, the isolation operating shaft (12) being configured to rotate to turn the high voltage switching device on or off.

2. The high voltage switchgear interlock mechanism of claim 1 wherein the door lock member (50) is further configured to remain stationary with the door (60) in response to the door (60) being closed, wherein the first interlock member (30) is configured to move through the first intersection point in response to the door lock member remaining stationary with the door (60) to limit movement of the door lock member (50) to limit opening and closing of the door (60), and/or the second interlock member (40) is configured to move through the second intersection point in response to the door lock member remaining stationary with the door (60) to limit movement of the door lock member (50) to limit opening and closing of the door (60).

3. The high voltage switchgear interlock mechanism of claim 1 wherein the first interlock component (30) and the second interlock component (40) are configured to move in parallel directions.

4. The high voltage switchgear interlock mechanism of claim 1 wherein said door lock assembly (50) comprises:

a first slider (51) slidingly arranged in the high voltage switchgear and connected with a first reset (91) fixed in the high voltage switchgear, the first reset (91) being configured to pull the first slider (51) to move to the first and second intersection in response to the cabinet door (60) opening.

5. The high voltage switchgear interlock mechanism of claim 4 wherein said first slider (51) comprises a groove (52), and

the cabinet door (60) comprises a protrusion (61), the protrusion (61) being configured to be snapped into the groove (52) to close the cabinet door (60).

6. The high voltage switchgear interlock mechanism according to claim 1, wherein the first interlock member (30) comprises a second slider (31) slidingly arranged in the high voltage switchgear and connected with the ground operation shaft (11) via a first transmission mechanism (70), the second slider (31) being connected with a second reset member (92) fixed in the high voltage switchgear, wherein the second slider (31) is configured to be moved away from the first intersection point by the first transmission mechanism (70) in response to the ground operation shaft (11) being rotated to the ground position to allow the door lock member (50) to be moved to the first intersection point, and/or the second slider (31) is configured to be moved by the second reset member (32) through the first intersection point in response to the ground operation shaft (11) being rotated to a ground release position to prevent the door lock member (50) from being moved to the first intersection point.

7. The high voltage switchgear interlock mechanism of claim 6 wherein said first transmission mechanism (70) comprises:

a cam (71) provided on the outer periphery of the ground operation shaft (11) and configured to rotate with the ground operation shaft (11);

a pivot arm (72) configured to abut the cam (71) and pivot in response to rotation of the cam (71); and

a traction member (73) having one end coupled with the pivot arm (72) and the other end coupled with the second slider (31).

8. The high voltage switchgear interlock mechanism according to claim 1, wherein the second interlock member (40) comprises a third slider (41) slidingly disposed in the high voltage switchgear and connected with the selector (20) via a second transmission mechanism (80), wherein the third slider (41) is configured to be moved away from the second intersection by the second transmission mechanism (80) to allow the door lock member (50) to move to the second intersection in response to the selector (20) changing to a state preventing rotation of the earthing operation shaft (11) and the isolating operation shaft (12), and/or the third slider (41) is configured to be moved to the second intersection by the second transmission mechanism (80) to prevent the door lock member (50) from moving through the second intersection in response to the selector (20) changing to a state preventing rotation of the isolating operation shaft (12).

9. The high voltage switchgear interlock mechanism of claim 8 wherein said second transmission mechanism (80) comprises:

a spindle (81) coupled to the selector (20) and configured to rotate in response to a change in state of the selector (20); and

a toggle lever (82) coupled to the rotary shaft (81) and configured to pivot in response to rotation of the rotary shaft (81) to toggle the third slider (41).

10. The high voltage switchgear interlock mechanism of claim 1, further comprising:

a motor configured to operate the ground operation shaft (11) and the isolation operation shaft (12); and

a motor switch coupled to the motor and disposed in a path of movement of the door lock member (50), wherein the motor switch is configured to be operated by the door lock member (50) to prevent the motor from being powered in response to the door (60) being opened, and/or the motor switch is configured to be operated by the door lock member (50) to allow the motor to be powered in response to the door (60) being closed.

11. A high voltage switchgear comprising:

three station mechanism (10), be suitable for driving three station switches, include:

The grounding operation shaft (11) is configured to rotate to ground or ungrounded a high-voltage switching device; and

the isolation operating shaft (12) is configured to rotate to turn the high-voltage switching device on or off;

a selector (20) configured to change, in response to an operation, between a state in which at least one of the ground operation shaft (11) and the isolation operation shaft (12) is blocked;

a cabinet door (60) adapted to be mounted at a cable compartment of the high voltage switchgear; and

an interlock mechanism, comprising:

a first interlocking member (30) coupled to the ground operation shaft (11) and configured to move in response to rotation of the ground operation shaft (11);

a door lock member (50) coupled to the cabinet door (60) and configured to prevent movement of the first and second interlock members (30, 40) through first and second intersection points at which the first and second interlock members (30, 40) are respectively abuttable in response to the cabinet door (60) being opened, such that the selector (20) prevents rotation of the ground operating shaft (11) from the ground position and prevents rotation of the isolation operating shaft (12) from the break-open position.

12. The high voltage switchgear of claim 11 wherein said door lock member (50) is further configured to remain stationary with said door (60) in response to said door (60) being closed, wherein said first interlocking member (30) is configured to move through said first intersection point in response to said door lock member remaining stationary with said door (60) to limit movement of said door lock member (50) to limit opening and closing of said door (60), and/or said second interlocking member (40) is configured to move through said second intersection point in response to said door lock member remaining stationary with said door (60) to limit movement of said door lock member (50) to limit opening and closing of said door (60).

13. The high voltage switchgear of claim 11 wherein said first interlocking part (30) and said second interlocking part (40) are configured to move in parallel directions.

14. The high voltage switchgear of claim 11 wherein said door lock component (50) comprises:

15. The high voltage switchgear of claim 14 wherein said first slider (51) comprises a groove (52), and

16. The high voltage switchgear of claim 11 wherein the first interlocking part (30) comprises a second slider (31) slidingly disposed in the high voltage switchgear and connected with the ground operation shaft (11) via a first transmission mechanism (70), the second slider (31) being connected with a second reset (92) fixed in the high voltage switchgear, wherein the second slider (31) is configured to be moved away from the first intersection point by the first transmission mechanism (70) in response to the ground operation shaft (11) rotating to the ground position to allow the door lock part (50) to move to the first intersection point, and/or the second slider (31) is configured to be moved through the first intersection point by the second reset (32) in response to the ground operation shaft (11) rotating to a ground release position to prevent the part (50) from moving to the first intersection point.

17. The high voltage switchgear of claim 16 wherein said first transmission mechanism (70) comprises:

18. The high voltage switchgear according to claim 11, wherein the second interlock part (40) comprises a third slide (41) slidingly arranged in the high voltage switchgear and connected with the selector (20) via a second transmission mechanism (80), wherein the third slide (41) is configured to be moved away from the second intersection by the second transmission mechanism (80) to allow the door lock part (50) to move to the second intersection in response to the selector (20) changing to a state preventing rotation of the earthing operation shaft (11) and the isolating operation shaft (12), and/or the third slide (41) is configured to be moved to the second intersection by the second transmission mechanism (80) to prevent movement of the door lock part (50) through the second intersection in response to the selector (20) changing to a state preventing rotation of the isolating operation shaft (12).

19. The high voltage switchgear of claim 18 wherein said second transmission mechanism (80) comprises:

20. The high voltage switching device of claim 11, wherein the interlock mechanism further comprises:

a motor switch coupled to the motor and disposed in a moving path of the door lock part (50),

wherein the motor switch is configured to be operated by the door lock member (50) in response to the cabinet door (60) being opened to prevent the motor from being powered, and/or the motor switch is configured to be operated by the door lock member (50) in response to the cabinet door (60) being closed to allow the motor to be powered.