CN217388017U - A shielding component and cubical switchboard for cubical switchboard - Google Patents

Abstract

Embodiments of the present disclosure provide a shielding assembly for a switchgear and a switchgear. The shielding assembly includes: at least one shielding plate movable between a first position and a second position in association with movement of the handcart, the at least one shielding plate being adapted to shield a stationary contact of the switchgear cabinet at the first position so as to electrically isolate the stationary contact from an external environment, and to expose the stationary contact at the second position so as to enable the stationary contact to electrically contact a moving contact arm of the handcart; and a plurality of position sensing elements arranged along a direction of movement of the at least one shield plate and adapted to generate a signal indicating movement of the at least one shield plate to the first position and a signal indicating movement of the at least one shield plate to the second position. Through this disclosed scheme, can judge whether there is the anomaly in the shielding component of cubical switchboard to the security of cubical switchboard has been improved.

Description

A shielding component and cubical switchboard for cubical switchboard

Technical Field

The present disclosure relates to the field of power equipment technology, and more particularly, to a shielding assembly and a switchgear including the same.

Background

In an electric power system or a power distribution system, a switch cabinet is used for opening, closing, controlling and protecting electric equipment in the processes of power generation, power transmission, power distribution and electric energy conversion. The switchgear may be provided with a hand truck that is movable in and out of a cabinet body of the switchgear, and electrical equipment such as a circuit breaker, a contactor, an isolation switch, a transformer, and the like may be mounted on the hand truck. Therefore, when the handcart moves into the switch cabinet and the movable contact arm on the handcart is in electrical contact with the fixed contact in the switch cabinet, the switch cabinet can be normally operated, and when the handcart moves out of the switch cabinet, electrical equipment (such as a circuit breaker, a contactor, an isolating switch or a mutual inductor) on the handcart can be overhauled and replaced.

During the movement of the hand truck into and out of the switchgear cabinet or after the movement out of the switchgear cabinet, persons or their limbs can enter the switchgear cabinet close to the high-voltage live components with the switchgear cabinet live, which threatens the safety of the persons. For this purpose, shielding components can be provided in the switchgear cabinet (for example, a circuit breaker compartment accommodating a trolley) in order to shield the high-voltage live equipment. From this, can protect the safety of the personnel of unexpected entering cubical switchboard. However, there are still some problems with the current switchgear and its shielding components. For example, in some cases, abnormalities such as tilting, twisting, and jamming of the shielding member may occur, and such abnormalities are not easily discovered in a timely manner, which may cause the shielding member to fail to provide effective shielding, and may cause an accident to occur.

SUMMERY OF THE UTILITY MODEL

To at least partially address the above and other potential problems, embodiments of the present disclosure provide an improved shield assembly for a switchgear and a switchgear.

According to an aspect of the present disclosure, there is provided a shielding assembly for a switchgear, the shielding assembly comprising: at least one shielding plate capable of moving between a first position and a second position in association with movement of the hand truck, the at least one shielding plate being adapted to shield a stationary contact of the switchgear at the first position to electrically isolate the stationary contact from an external environment, and to expose the stationary contact at the second position to enable the stationary contact to electrically contact a moving contact arm of the hand truck; and a plurality of position sensing elements arranged along a direction of movement of the at least one shield plate and adapted to generate a signal indicating movement of the at least one shield plate to the first position and a signal indicating movement of the at least one shield plate to the second position.

In some embodiments of the present disclosure, the plurality of position sensing elements are arranged adjacent to an edge of the at least one shielding plate in a lateral direction, the lateral direction being orthogonal to a direction of movement of the at least one shielding plate.

In some embodiments of the present disclosure, the at least one shielding plate includes a first shielding plate and a second shielding plate respectively used for an upper static contact and a lower static contact of the static contacts, the first shielding plate and the second shielding plate move synchronously, and the plurality of position sensing elements includes a pair of position sensing elements for sensing a position of the first shielding plate or the second shielding plate, or includes two pairs of position sensing elements for sensing a position of the first shielding plate and the second shielding plate, respectively, and the two pairs of position sensing elements share a signal line.

In some embodiments of the present disclosure, each pair of position sensing elements comprises a first position sensing element arranged adjacent to an edge of the corresponding shield plate remote from the second position when the corresponding shield plate is in the first position, and a second position sensing element arranged adjacent to an edge of the corresponding shield plate remote from the first position when the corresponding shield plate is in the second position.

In some embodiments of the present disclosure, the shielding assembly further comprises: a frame comprising a first section on which the at least one shield plate is movably disposed and a second section adapted to movably receive the hand truck, and on which the plurality of position sensing elements are mounted; a transmission member coupled between the at least one shield plate and the hand truck to correlate movement of the hand truck with movement of the at least one shield plate; and a locking member adapted to lock and unlock the at least one shielding plate.

In some embodiments of the present disclosure, the at least one shield plate is made of an electrically conductive material and is adapted to be grounded.

In some embodiments of the present disclosure, the plurality of position sensing elements includes at least one of a photo-sensing element, a proximity sensing element, and a micro-switch element.

According to an aspect of the present disclosure, there is provided a switchgear comprising: a shielding assembly according to the first aspect; and a controller communicatively coupled to the plurality of position sensing elements.

In some embodiments of the present disclosure, the switchgear further comprises: a hand truck position detection component communicatively connected to the controller and adapted to generate a signal indicative of a position of the hand truck, wherein the controller is configured to determine an abnormal state of the at least one shielding plate based on at least one of: a signal indicative of at least one shield plate being locked or unlocked, a signal from a plurality of position sensing elements, and a signal from a hand truck position detection component.

In some embodiments of the present disclosure, the switchgear further comprises: a voltage detection component communicatively connected to the controller, the voltage sensing element being adapted to generate a sensing signal indicative of a voltage of the stationary contact; and a cabinet door position detection component communicatively connected to the controller, the cabinet door position detection component adapted to generate a signal indicative of opening and closing of a cabinet door of the switchgear, wherein the controller is further configured to generate a safety alarm signal based on at least one of: a signal indicative of at least one shield plate being locked or unlocked, a signal from the plurality of position sensing elements, a signal from the hand truck position detection component, a signal from the voltage detection component, and a signal from the cabinet door position detection component.

The summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The summary is not intended to identify key features or essential features of the disclosure, nor is it intended to limit the scope of the disclosure.

Drawings

The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.

Fig. 1A, 1B, and 1C show schematic diagrams of a switchgear according to embodiments of the present disclosure.

Fig. 2 shows a schematic view of a shielding assembly according to an embodiment of the disclosure.

Fig. 3 illustrates a perspective view of a shield assembly according to an embodiment of the present disclosure.

FIG. 4 illustrates a front view and a partial magnified view of a shield assembly employing a photo-sensing element according to an embodiment of the disclosure.

Fig. 5 illustrates a front view and a partial enlarged view of a shield assembly employing a micro-switch element according to an embodiment of the present disclosure.

Fig. 6 shows a control block diagram of a switchgear according to an embodiment of the present disclosure.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Alternative embodiments will become apparent to those skilled in the art from the following description without departing from the spirit and scope of the disclosure.

The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". Other explicit and implicit definitions are also possible below.

In an embodiment of the present disclosure, an improved shielding assembly for a switchgear and a switchgear comprising the shielding assembly are presented. By providing a low-cost position sensing element, it is possible to determine whether the shield plate reaches a desired position, and thus to judge whether there is an abnormal situation such as jamming, tilting, and twisting of the shield assembly, so as to perform maintenance or replacement in time, which effectively avoids and reduces malfunction and safety accidents of the switchgear.

Fig. 1A, 1B, and 1C show schematic diagrams of a switchgear 1000 in accordance with embodiments of the present disclosure. As an example, the switch 1000 may include a stationary contact 300 and a plurality of compartments including, for example, a bus bar compartment 400, a cable compartment 500, and a breaker compartment 600. An upper one of the stationary contacts 300 is located in the bus bar compartment 400 and connected to the bus bar, and a lower one of the stationary contacts 300 is located in the cable compartment 500 and connected to the cable. During operation of the switchgear 1000, the bus bars within the bus bar compartment 400 may be connected to a power source, such as a utility grid, and the cables within the cable compartment 500 may be connected to the powered devices. The switchgear 1000 may also include a trolley 200 that can be moved in and out of the circuit breaker compartment 600. In fig. 1A, 1B and 1C, the hand truck 200 is in a removed position, a testing/isolation position and an operating position, respectively. The trolley 200 may be, for example, a circuit breaker trolley, so that the moving contact arm 210 of the circuit breaker may be in electrical contact with the stationary contact 300 when the trolley 200 is in the operating position. For example, the upper movable contact arm of the movable contact arm 210 is electrically contacted with the upper stationary contact, and the lower movable contact arm of the movable contact arm 210 is electrically contacted with the lower stationary contact. In this way, the circuit breaker on the hand truck 200 is switched into the primary circuit between the power source and the electric equipment, and thus the opening and closing operations can be performed on the primary circuit. It should be noted that the type of the hand truck 200 is not limited thereto, and may be other types of hand trucks, such as a voltage transformer hand truck, a contactor hand truck, an isolation switch hand truck, and the like.

According to embodiments of the present disclosure, the switchgear 1000 may include the shielding assembly 100. As an example, the shielding assembly 100 is provided in a switchgear cabinet 1000, for example in a circuit breaker chamber 600, to shield the stationary contact 300 when the hand truck 200 is in the removed position and the testing/isolation position. By means of the shielding assembly 100, it is possible to protect personnel in case of accidental access to the switchgear 1000 by personnel or their limbs.

Fig. 2 shows a schematic view of a shielding assembly 100 according to an embodiment of the disclosure. According to an embodiment of the present disclosure, the shielding assembly 100 comprises at least one shielding plate 110, the at least one shielding plate 110 being movable between a first position and a second position in association with the movement of the handcart 200, the at least one shielding plate 110 being adapted to shield the stationary contact 300 of the switchgear 1000 at the first position to electrically isolate the stationary contact 300 from the external environment, and to expose the stationary contact 300 at the second position to enable the stationary contact 300 to electrically contact the movable contact arm 210 of the handcart 200.

As an example, the location of the shield plate 110 may be correlated to the location of the hand truck 200. When the handcart 200 moves out of the cabinet body of the switch cabinet 1000 (as shown in fig. 1A), the shielding plate 110 closes the stationary contact 300 at the first position, i.e., the shielding plate 110 in fig. 2 is at the solid line position; when the hand truck 200 moves into the cabinet and is in the testing/isolating position (as shown in fig. 1B), the shielding plate 110 may still remain in the first position to enclose the stationary contact 300. Subsequently, as the hand truck 200 continues to advance inwardly, the shield plate 110 begins to move from the closed first position to the second position. When the shielding plate 110 is moved to the second position, i.e. the shielding plate 110 in fig. 2 is in the position of the dotted line, the stationary contact 300 is completely uncovered by the shielding plate 110. Thereby, the hand truck 200 continues to advance and brings the contact arm 210 into contact with the stationary contact 300 (as shown in fig. 1C). By providing the shielding plate 110, the stationary contact 300 is isolated from the external environment at least when the hand truck 200 is in the testing/isolating position and the removed position, thereby protecting the safety of personnel. In some embodiments of the present disclosure, at least one shield plate 110 is made of a conductive material and is adapted to be grounded. In this way, the stationary contact 300 can be effectively electrically isolated from the external environment, thereby protecting the safety of the operator.

According to an embodiment of the present disclosure, the shielding assembly 100 comprises a plurality of position sensing elements 120, the plurality of position sensing elements 120 being arranged along the moving direction D1 of the at least one shielding plate 110 and being adapted to generate a signal indicating that the at least one shielding plate 110 is moved to the first position and a signal indicating that the at least one shielding plate 110 is moved to the second position.

As an example, the plurality of position sensing elements 120 may be arranged along the moving direction D1 of the shield plate 110. Thereby, it may be determined by means of the position sensing element 120 whether the shielding plate 110 has moved to the first position or to the second position. In this way, it is possible to help determine whether an abnormal condition occurs in the shield plate 110, such as whether it is jammed during movement from the first position to the second position or from the second position to the first position. For example, as the hand truck 200 continues to advance inwardly from the testing/isolation position, the shield plate 110 should move from the closed first position to the open second position in association with movement of the hand truck 200. However, if the plurality of position sensing elements 120 determine that the shielding plate 110 remains at the first position or does not reach the second position for a long time, it may be determined that the shielding assembly 100 is abnormal, for example, the shielding plate 110 is jammed. Alternatively, the sensing result of the position sensing element 120 may be combined with other signals (e.g., a signal indicating the position of the hand truck) to determine whether the shielding plate 110 has an abnormality.

In some embodiments of the present disclosure, the plurality of position sensing elements 120 are disposed adjacent to an edge of the at least one shielding plate 110 in a lateral direction D2, the lateral direction D2 being orthogonal to the direction of movement D1 of the at least one shielding plate 110. As an example, the plurality of position sensing elements 120 may be disposed at a left or right edge of the shield plate 110, i.e., an edge in the lateral direction D2. Arranging the position sensing element at the edge of the shielding plate 110 is more advantageous to detect the twist and inclination of the shielding plate 110. For example, when the shielding plate 110 is tilted, the corresponding position sensor 120 may not sense the presence of the shielding plate 110 even though the shielding plate 110 is already substantially located at the first position. If it is not detected that the shielding plate 110 reaches the predetermined position for a long time or the hand truck 200 has been in place without detecting the shielding plate 110, it can be determined that an abnormal condition such as tilting of the shielding plate 110 has occurred.

In some embodiments of the present disclosure, the at least one shielding plate 110 includes a first shielding plate and a second shielding plate respectively used for an upper static contact and a lower static contact of the static contacts 300, the first shielding plate and the second shielding plate move synchronously, and the plurality of position sensing elements 120 includes a pair of position sensing elements for sensing the position of the first shielding plate or the second shielding plate, or includes two pairs of position sensing elements for sensing the position of the first shielding plate and the second shielding plate, respectively, and the two pairs of position sensing elements share a signal line. Specifically, two shielding plates may be used to shield the upper fixed contact and the lower fixed contact in the fixed contact 300, respectively. Since the two shield plates are moved between the first position and the second position in synchronization, a pair of position sensing elements may be provided only for one of the shield plates. That is, sensing movement of only one of the two shield plates is sufficient to determine movement of both shield plates. Alternatively, two pairs of position sensing elements may also be provided for two shield plates, whereby both shield plates are position sensed. In this case, the two pairs of position sensing elements may share signal lines in order to reduce wiring, thereby saving space and cost.

In some embodiments of the present disclosure, each pair of position sensing elements comprises a first position sensing element and a second position sensing element. The first position sensing element is arranged to: when the corresponding shielding plate is in the first position, the edge of the corresponding shielding plate far away from the second position is adjacent. The second position sensing element is arranged to: when the corresponding shielding plate is in the second position, the edge of the corresponding shielding plate far from the first position is adjacent. Specifically, the two position sensing elements for each shield plate may be positioned at the edges of the movement range of the shield plate, i.e., the uppermost edge and the lowermost edge in the direction D1. Thus, the first position sensing element may sense the shield plate only when the shield plate reaches or is in the first position, and the second position sensing element may sense the shield plate only when the shield plate reaches or is in the second position. In this way, whether the shielding plate reaches the desired position can be judged more accurately, and thus whether the shielding plate is abnormal or not can be determined.

Fig. 3 illustrates a perspective view of the shield assembly 100 according to an embodiment of the present disclosure. The shielding assembly 100 may include a frame 130, the frame 130 including a first section 131 and a second section 132, the at least one shielding plate 110 movably disposed on the first section 131, the second section 132 adapted to movably receive the hand truck 200, and the plurality of position sensing elements 120 mounted on the first section 131. As an example, the first and second sections 131, 132 of the frame 130 may be provided with guiding means such as sliding rails, whereby the shielding plate 110 and the hand truck 200 may move or slide on the first and second sections 131, 132, respectively. In addition, the position sensing element 120 disposed on the first section 131 may effectively sense the first and second positions of the shield plate 110.

The shielding assembly may further include a transmission member 140, the transmission member 140 being coupled between the at least one shielding plate 110 and the hand truck 200 to correlate movement of the hand truck 200 with movement of the at least one shielding plate 110. As an example, the transmission member 140 may be a link mechanism. As the hand truck 200 moves on the second section 132, the push rod may act and thus drive the shield plate 110 to move. When the handcart 200 moves from the testing/isolating position or the removing position to the working position, the handcart 200 drives the shielding plate 110 to move from the closed first position to the open second position through the transmission member 140, so that the movable contact arm 210 of the handcart 200 can contact the fixed contact 300; and when the hand truck 200 moves from the working position to the testing/isolating position and the removing position, the hand truck 200 moves from the open second position to the closed first position via the transmission member 140 to shield the stationary contact 300.

The shield assembly may further comprise a locking member adapted to lock and unlock the at least one shield plate 110. Specifically, the shielding plate 110 may be locked with a locking member as needed so that the shielding plate 110 is locked at the first position or the second position. Further, the locking member may also generate a locking signal or an unlocking signal as needed to achieve the provision of functions such as abnormality judgment and security alarm in cooperation with other signals.

Fig. 4 illustrates a front view and a partial enlarged view of the shield assembly 100 employing a photo sensing element according to an embodiment of the present disclosure, and fig. 5 illustrates a front view and a partial enlarged view of the shield assembly 100 employing a micro switching element according to an embodiment of the present disclosure. In some embodiments of the present disclosure, the plurality of position sensing elements 120 includes at least one of a photo sensing element, a proximity sensing element, and a micro switch element. As an example, in the case of employing the photo sensing element, when the shielding plate 110 is moved to the first position or the second position, the shielding plate 110 will be interposed between the light emitting device and the light receiving device of the photo sensing element, so that the light receiving device cannot receive the light emitted from the light emitting device, whereby the photo sensing element will emit a signal indicating that the shielding plate 110 is sensed. In the case of employing a micro-switch element or a proximity sensing element, the presence of the shield plate 110 may be sensed by pressing the micro-switch element by the shield plate 110 or approaching the proximity sensing element.

Fig. 6 shows a control block diagram of a switchgear 1000 according to an embodiment of the present disclosure. According to an embodiment of the present disclosure, the switchgear 1000 may include a controller 700, the controller 700 communicatively connected to the position sensing element 120. As an example, the controller 700 may receive sensing signals from the position sensing element 120 and determine whether the shielding plate 110 of the shielding assembly 100 moves to the first position and the second position as required based on the sensing signals, and thus determine whether there is an abnormality in the shielding plate 110.

In some embodiments of the present disclosure, the switchgear 1000 may comprise a hand truck position detection component 701, the hand truck position detection component 701 being communicatively connected to the controller 700 and adapted to generate a signal indicative of a position of the hand truck 200, wherein the controller 700 is configured to determine an abnormal state of the at least one shielding plate 110 based on at least one of: a signal indicating that at least one shield plate 110 is locked or unlocked, a signal from the plurality of position sensing elements 120, and a signal from the hand truck position detection component 701. Specifically, the controller 700 may determine whether an abnormality occurs in the shielding plate 110 of the shielding assembly 100 through a combination of various signals. For example, when the controller 700 receives the unlocking signal of the shield door locking member 703 and receives the signal that the hand truck 200 reaches the test/isolation position, if the position sensing element 120 fails to detect that the shield door 110 reaches the closed first position, it may be determined that the shield door 110 is abnormal.

In some embodiments of the present disclosure, the switchgear 1000 may further include a voltage detection component 702 and a cabinet door position detection component 704. The voltage detection means 702 is communicatively connected to the controller 700 and is adapted to generate a sensing signal indicative of the voltage of the stationary contact 300. The cabinet door position detection component 704 is communicatively connected to the controller 700 and is adapted to generate a signal indicative of the opening and closing of a cabinet door of the switchgear 1000. The controller 700 is further configured to generate a safety alarm signal based on at least one of: a signal indicating that at least one of the screen doors 110 is locked or unlocked, a signal from the plurality of position sensing elements 120, a signal from the hand truck position detection component 701, a signal from the voltage detection component 702, and a signal from the cabinet door position detection component 704. Specifically, through a combination of various signals, the controller 700 may determine whether there is a problem with the switchgear 1000 that may affect the safety of personnel, and thus alert peripheral devices or operators. For example, when it is determined that the shielding door 110 is abnormal, the fixed contact 300 is charged, and the cabinet door is not closed, an alarm may be sent to an operator to prevent the operator from approaching the switch cabinet 1000.

Many modifications and other embodiments of the disclosure set forth herein will come to mind to one skilled in the art to which this disclosure pertains having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the embodiments of the disclosure are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the disclosure. Moreover, while the above description and the related figures describe example embodiments in the context of certain example combinations of components and/or functions, it should be appreciated that different combinations of components and/or functions may be provided by alternative embodiments without departing from the scope of the present disclosure. In this regard, for example, other combinations of components and/or functions than those explicitly described above are also contemplated as within the scope of the present disclosure. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (10)

1. A shielding assembly for a switchgear cabinet, comprising:

at least one shielding plate (110) movable between a first position and a second position in association with a movement of a hand truck (200), said at least one shielding plate (110) being adapted to shield a stationary contact (300) of said switchgear cabinet (1000) at said first position to electrically isolate said stationary contact (300) from an external environment, and to expose said stationary contact (300) at said second position to enable said stationary contact (300) to electrically contact a movable contact arm (210) of said hand truck (200); and

a plurality of position sensing elements (120) arranged along a direction of movement (D1) of the at least one shielding plate (110) and adapted to generate a signal indicating that the at least one shielding plate (110) is moved to the first position and a signal indicating that the at least one shielding plate (110) is moved to the second position.

2. The shielding assembly according to claim 1, characterized in that the plurality of position sensing elements (120) are arranged adjacent to an edge of the at least one shielding plate (110) in a lateral direction (D2), the lateral direction (D2) being orthogonal to a moving direction (D1) of the at least one shielding plate (110).

3. The shielding assembly according to claim 1 or 2, wherein the at least one shielding plate (110) comprises a first shielding plate and a second shielding plate for an upper static contact and a lower static contact, respectively, of the static contacts (300), the first shielding plate and the second shielding plate moving synchronously, and

the plurality of position sensing elements (120) include one pair of position sensing elements for sensing the position of the first shield plate or the second shield plate, or two pairs of position sensing elements for sensing the position of the first shield plate and the second shield plate, respectively, the two pairs of position sensing elements sharing a signal line.

4. The shielding assembly of claim 3, wherein each pair of position sensing elements includes a first position sensing element and a second position sensing element,

wherein the first position sensing element is arranged adjacent an edge of the corresponding shield plate distal from the second position when the corresponding shield plate is in the first position; the second position sensing element is arranged adjacent an edge of the corresponding shield plate remote from the first position when the corresponding shield plate is in the second position.

5. The shielding assembly of claim 1, further comprising:

a frame (130) comprising a first section (131) and a second section (132), the at least one shield plate (110) being movably disposed on the first section (131), the second section (132) being adapted to movably receive the hand truck (200), and the plurality of position sensing elements (120) being mounted on the first section (131);

a transmission member (140) coupled between the at least one shield plate (110) and the hand truck (200) to correlate movement of the hand truck (200) with movement of the at least one shield plate (110); and

a locking member adapted to lock and unlock the at least one shielding plate (110).

6. The shielding assembly according to claim 1, characterized in that said at least one shielding plate (110) is made of an electrically conductive material and is adapted to be grounded.

7. The shielding assembly of claim 1, wherein the plurality of position sensing elements (120) comprises at least one of a photo sensing element, a proximity sensing element, and a micro switch element.

8. A switchgear, comprising:

the shielding assembly (100) according to any one of claims 1-7; and

a controller (700) communicatively connected to the plurality of position sensing elements (120).

9. The switchgear cabinet of claim 8, further comprising:

a hand truck position detection component (701) communicatively connected to the controller (700) and adapted to generate a signal indicative of a position of the hand truck (200),

wherein the controller (700) is configured to determine an abnormal state of the at least one shielding plate (110) based on at least one of: a signal indicating that the at least one shield plate (110) is locked or unlocked, a signal from the plurality of position sensing elements (120), and a signal from the hand truck position detection component (701).

10. The switchgear cabinet of claim 9, further comprising:

-a voltage detection means (702) communicatively connected to said controller (700) and adapted to generate a signal indicative of the voltage of said stationary contact (300); and

a cabinet door position detection component (704) communicatively connected to the controller (700) and adapted to generate a signal indicative of the opening and closing of a cabinet door of the switchgear cabinet (1000),

wherein the controller (700) is further configured to generate a safety alert signal based on at least one of: a signal indicating that the at least one shielding plate (110) is locked or unlocked, a signal from the plurality of position sensing elements (120), a signal from the hand truck position detection component (701), a signal from the voltage detection component (702), and a signal from the cabinet door position detection component (704).

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