Nuclear power plant switchgear and power distribution system to prevent misoperation of an earth leakage protection device

Abstract

The application relates to a nuclear power station switch cabinet and power distribution system capable of preventing misoperation of an electric leakage protection device, the nuclear power station switch cabinet comprising a power distribution bin, a storage drawer and an electric leakage protection device, the power distribution bin comprising a bin body and a bin door, the bin door being rotationally connected with the bin body; the bin body is provided with an assembly cavity; the storage drawer is movably arranged in the assembly cavity; the storage drawer is provided with a containing cavity and a mounting hole in communication with the containing cavity; the mounting hole is located on the side of the storage drawer facing the bin door; the electric leakage protection device comprises an electric leakage sensor and an electric leakage relay; the electric leakage sensor is arranged in the containing cavity; the electric leakage relay is arranged in the mounting hole, and the electric leakage relay is electrically connected with the electric leakage sensor. The application can reduce the tripping caused by misoperation of the electric leakage relay.

Description

Technical Field

[0001] This application relates to the field of nuclear power plant power distribution equipment, and more particularly to a nuclear power plant switchgear and power distribution system for preventing malfunction of leakage protection devices. Background Technology

[0002] The low-voltage switchboard system is a core component of the nuclear power plant's electrical system, primarily responsible for distributing power to various equipment and systems to ensure the safe and stable operation of the nuclear power plant. This system not only provides reliable power to critical equipment in both the nuclear island and conventional island but also supports the normal operation of various protection, monitoring, and control systems. As the core of power distribution in a nuclear power plant, the low-voltage switchboard system plays a vital role in the plant's operational safety.

[0003] In related technologies, the leakage current relays of the power distribution switchgear in nuclear power plants are usually installed on the cable compartment panel. When the compartment door is opened, there is a possibility that the connecting cable between the leakage current relay and the leakage current sensor may be dragged, causing the leakage current disconnection protection to activate and resulting in false tripping. Utility Model Content

[0004] This application provides a nuclear power plant switchgear and power distribution system for preventing malfunction of leakage current protection devices, in order to solve the problem of leakage current relays tripping due to malfunction.

[0005] In a first aspect, this application provides a nuclear power plant switchgear for preventing malfunction of leakage protection devices, comprising:

[0006] A power distribution compartment includes a compartment body and a compartment door, the compartment door being rotatably connected to the compartment body; the compartment body has an assembly cavity.

[0007] A storage drawer is movably disposed within the assembly cavity; the storage drawer has a receiving cavity and a mounting hole communicating with the receiving cavity; the mounting hole is located on the side of the storage drawer facing the compartment door;

[0008] A leakage current protection device includes a leakage current sensor and a leakage current relay; the leakage current sensor is disposed in the receiving cavity; the leakage current relay passes through the mounting hole and is electrically connected to the leakage current sensor.

[0009] Furthermore, the leakage relay includes:

[0010] The main body is inserted through the mounting hole; the main body is electrically connected to the leakage current sensor.

[0011] A snap-fit ​​connector is provided on the side of the main body facing the compartment door and abuts against the storage drawer;

[0012] A locking member is movably disposed on the periphery of the main body and located within the receiving cavity; the locking member can move toward the snap-fit ​​member to abut against the storage drawer, so that the leakage relay is locked to the storage drawer.

[0013] Furthermore, the body component has a locking boss on its periphery, and the locking boss has a threaded hole; the locking member has an external thread; the locking member passes through the threaded hole and extends from the side of the locking boss facing the snap-fit ​​member.

[0014] Furthermore, the locking boss is provided on two opposing peripheral sides of the body component; each locking boss is threadedly connected to the locking member.

[0015] Furthermore, a wiring component is provided on the side of the main body away from the snap-fit ​​component; the main body is electrically connected to the leakage current sensor through the wiring component.

[0016] Furthermore, it also includes a buckle, which fits against the side of the storage drawer facing the door and is provided corresponding to the mounting hole; the buckle has an adapter hole communicating with the mounting hole; the leakage current relay passes through the adapter hole; wherein the size of the adapter hole is adapted to the outer peripheral size of the leakage current relay.

[0017] Furthermore, the buckle is made of PVC material.

[0018] Furthermore, the storage drawer includes a bottom plate, a left side plate and a right side plate disposed on the bottom plate and spaced apart, and a front plate and a rear plate disposed on the bottom plate and spaced apart; the bottom plate, the left side plate, the right side plate, the front plate and the rear plate enclose the receiving cavity;

[0019] The mounting holes are located on the front panel.

[0020] Furthermore, the front panel is provided with a handle;

[0021] And / or, the rear plate is provided with a first connector, the compartment body is provided with a second connector, and the first connector and the second connector are mated together.

[0022] Secondly, this application provides a power distribution system for a nuclear power plant, comprising:

[0023] The main body of the power distribution system;

[0024] The nuclear power plant switchgear described above is designed to prevent malfunction of leakage protection devices, and the nuclear power plant switchgear is located within the main body of the power distribution system.

[0025] The technical solution provided in this application has the following advantages compared with the prior art:

[0026] In the technical solution of this application, both the leakage current sensor and the leakage current relay are installed in the storage drawer. On the one hand, the rotation of the drawer door will not affect the leakage current relay; on the other hand, when the storage drawer is pulled out as a whole, the leakage current sensor and the leakage current relay move synchronously, and the connecting cable between the leakage current sensor and the leakage current relay will not be pulled. This can reduce the possibility of the leakage current relay tripping due to malfunction. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0030] Figure 1 A schematic diagram of the structure of a nuclear power plant switchgear for preventing malfunction of leakage protection devices provided in this application embodiment;

[0031] Figure 2 for Figure 1 Assembly diagram of the central storage drawer and leakage protection device;

[0032] Figure 3 for Figure 2 A schematic diagram of the leakage current relay in the diagram;

[0033] Figure 4 for Figure 3 Another angle diagram;

[0034] Figure 5 for Figure 2 A diagram illustrating the connection between the central latch and the storage drawer.

[0035] Explanation of reference numerals in the attached figures:

[0036] Nuclear power plant switchgear 100,

[0037] Distribution compartment 1, compartment body 11, compartment door 12,

[0038] Storage drawer 2, receiving cavity 2a, mounting hole 2b, bottom plate 21, left side plate 22, right side plate 23, front plate 24, rear plate 25, handle 26, first connector 27.

[0039] Leakage protection device 3, leakage sensor 31, leakage relay 32, body component 321, snap-fit ​​component 322, locking component 323, locking boss 324, wiring component 325.

[0040] 4. Clip, 4a. Adapter hole, 5. Electrical component. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0043] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0044] To address the technical problem in the prior art where the connecting cable between the leakage current sensor and the leakage current relay is easily pulled when the door is opened, causing the leakage current relay to malfunction and trip, this application provides a nuclear power plant switchgear that can be applied to the power distribution system of a nuclear power plant, thereby reducing the occurrence of leakage current relay tripping due to malfunction.

[0045] Firstly, Figures 1 to 5 A nuclear power plant switchgear 100 for preventing malfunction of a leakage current protection device, provided in this application embodiment, includes a power distribution compartment 1, a storage drawer 2, and a leakage current protection device 3. The power distribution compartment 1 includes a compartment body 11 and a compartment door 12, with the compartment door 12 rotatably connected to the compartment body 11. The compartment body 11 has an assembly cavity. When the compartment door 12 rotates toward the compartment body 11, it can rotate to close the assembly cavity. When the compartment door 12 rotates away from the compartment body 11, it can rotate to open the assembly cavity.

[0046] The storage drawer 2 is movably disposed within the assembly cavity; the storage drawer 2 can be moved to be stored within the assembly cavity, or the storage drawer 2 can be pulled out of the assembly cavity. When the assembly cavity is closed by the door 12, the storage drawer 2 is completely stored within the assembly cavity, and the electrical distribution compartment 1 can provide isolation and protection for the storage drawer 2.

[0047] The storage drawer 2 has a receiving cavity 2a and a mounting hole 2b communicating with the receiving cavity 2a; the receiving cavity 2a is used to accommodate electrical components 5. The mounting hole 2b is located on the side of the storage drawer 2 facing the door 12; the leakage protection device 3 includes a leakage sensor 31 and a leakage relay 32; the leakage sensor 31 is located inside the receiving cavity 2a; the leakage relay 32 passes through the mounting hole 2b and is electrically connected to the leakage sensor 31. The leakage sensor 31 is used to detect whether leakage has occurred and controls the switching of the leakage relay 32 based on the detected leakage information.

[0048] Understandably, by installing both the leakage current sensor 31 and the leakage current relay 32 in the storage drawer 2, on the one hand, the rotation of the door 12 will not affect the leakage current relay 32; on the other hand, when the storage drawer 2 is pulled out as a whole, the leakage current sensor 31 and the leakage current relay 32 move synchronously, and the connecting cable between the leakage current sensor 31 and the leakage current relay 32 will not be pulled, thus reducing the possibility of the leakage current relay 32 tripping due to malfunction.

[0049] Meanwhile, the leakage current relay 32 is installed through the mounting hole 2b on the side of the storage drawer 2 facing the door 12. In this way, when the door 12 is opened, the leakage current relay 32 is exposed, which makes it convenient for the operator to manually operate the leakage current relay 32.

[0050] like Figure 2 and Figure 3As shown, in the technical solution of this embodiment, the leakage current relay 32 includes a body 321, a snap-fit ​​member 322, and a locking member 323. The body 321 passes through the mounting hole 2b; the body 321 is electrically connected to the leakage current sensor 31; the snap-fit ​​member 322 is located on the side of the body 321 facing the door 12 and abuts against the storage drawer 2; the locking member 323 is movably located on the periphery of the body 321 and is located in the receiving cavity 2a; the locking member 323 can move toward the snap-fit ​​member 322 to abut against the storage drawer 2, so that the leakage current relay 32 is locked in the storage drawer 2.

[0051] Understandably, the main body 321 is inserted into the mounting hole 2b from the side of the storage drawer 2 facing the compartment 11 until the snap-fit ​​322 abuts against the storage drawer 2. Then, the locking member 323 is turned so that the locking member 323 moves toward the snap-fit ​​322 and abuts against the storage drawer 2. In this way, the locking member 323 and the snap-fit ​​322 abut against the inner and outer sides of the storage drawer 2, thereby achieving the purpose of fixing the leakage current relay 32 to the storage drawer 2 and improving the installation stability of the leakage current relay 32.

[0052] After the position of the leakage relay 32 is fixed, the main body 321 extends into the receiving cavity 2a and can be electrically connected to the leakage sensor 31 located in the receiving cavity 2a via a cable. The connection is convenient, and since the leakage sensor 31 and the leakage relay 32 are close to each other, the leakage sensor 31 and the leakage relay 32 can be directly connected via a cable, reducing the use of intermediate connecting parts between the leakage sensor 31 and the leakage relay 32.

[0053] refer to Figure 3 and Figure 4 The snap-fit ​​component 322 protrudes from the peripheral wall of the end of the main body 321 facing the door 12, and the snap-fit ​​component 322 is integrally connected with the main body 321.

[0054] It should be noted that, Figure 2 and Figure 3 The external structure of the leakage current relay 32 is shown in the figure. The internal structure of the leakage current relay 32 can adopt the relay structure in the prior art. This application does not improve the principle structure of the leakage current relay 32.

[0055] like Figure 3 As shown, in the technical solution of this embodiment, the body 321 is provided with a locking boss 324 on its periphery, and the locking boss 324 is provided with a threaded hole; the locking member 323 is provided with an external thread; the locking member 323 passes through the threaded hole and extends from the side of the locking boss 324 facing the snap-fit ​​member 322.

[0056] Understandably, the locking boss 324 provides an installation position for the locking member 323. By turning the locking member 323, the leakage current relay 32 can be locked or unlocked from the storage drawer 2. The threaded connection between the locking member 323 and the locking boss 324 provides high connection stability, allowing the leakage current relay 32 to be stably mounted in the mounting hole 2b.

[0057] like Figure 4 As shown, in the technical solution of this embodiment, the two opposing peripheral sides of the main body 321 are respectively provided with locking bosses 324; each locking boss 324 is threadedly connected to a locking member 323. In this way, the stability of the leakage relay 32 when fixed to the storage drawer 2 can be further improved.

[0058] like Figure 3 As shown, in the technical solution of this embodiment, a connector 325 is provided on the side of the main body 321 away from the snap-fit ​​connector 322; the main body 321 is electrically connected to the leakage current sensor 31 through the connector 325. It can be understood that the connector 325 is located in the receiving cavity 2a, which facilitates connection with the leakage current sensor 31 via cable and facilitates cable arrangement.

[0059] like Figure 1 and Figure 5 As shown, in the technical solution of this embodiment, a buckle 4 is also included. The buckle 4 is attached to the side of the storage drawer 2 facing the door 12 and is set corresponding to the mounting hole 2b. The buckle 4 is provided with an adapter hole 4a that communicates with the mounting hole 2b. The leakage current relay 32 passes through the adapter hole 4a. The size of the adapter hole 4a is adapted to the outer peripheral size of the leakage current relay 32.

[0060] The clip 4 fits snugly against the outer wall of the storage drawer 2, and the adapter hole 4a of the clip 4 matches the outer peripheral dimensions of the leakage current relay 32, thus serving to cover the mounting hole 2b, prevent dust, and improve the appearance. This improves the applicability of the mounting hole 2b of the storage drawer 2, allowing for the installation of leakage current relays 32 of different sizes.

[0061] In this embodiment, the buckle 4 is sleeved on the main body and located between the snap fastener 322 and the storage drawer 2. The snap fastener 4 is stably pressed against the storage drawer 2 by the snap fastener 322, thereby improving the positional stability of the buckle 4.

[0062] In the technical solution of this embodiment, the buckle 4 is made of PVC (polyvinyl chloride), which is low in cost and easy to process.

[0063] like Figure 2As shown, in this embodiment, the storage drawer 2 includes a base plate 21, a left side plate 22 and a right side plate 23 disposed on the base plate 21 and spaced apart, and a front plate 24 and a rear plate 25 disposed on the base plate 21 and spaced apart; the base plate 21, left side plate 22, right side plate 23, front plate 24 and rear plate 25 enclose a receiving cavity 2a; a mounting hole 2b is provided on the front plate 24. This storage drawer 2 has a simple structure, and the receiving cavity 2a is open, which facilitates the assembly of electrical components 5 within the receiving cavity 2a and also facilitates the removal of the storage drawer 2 for inspection.

[0064] It should be noted that the front panel 24 is also provided with other components (not shown in the figure) that are connected to the electrical components 5 in the receiving cavity 2a.

[0065] like Figure 1 As shown, in the technical solution of this embodiment, the front panel 24 is provided with a handle 26, which facilitates pulling the storage drawer 2.

[0066] like Figure 2 As shown, in this embodiment, the rear plate 25 is provided with a first connector 27, which is electrically connected to the electrical component 5 inside the receiving cavity 2a. The compartment 11 is provided with a second connector, and the first connector 27 is connected to the second connector. It can be understood that the electrical connection is achieved through the connection of the first connector 27 and the second connector.

[0067] Secondly, this application also provides a power distribution system for a nuclear power plant, including a power distribution system body and a nuclear power plant switchgear 100 for preventing malfunction of the leakage current protection device as described above. The specific structure of the nuclear power plant switchgear 100 is as described in the above embodiments. Since the power distribution system of this nuclear power plant adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The nuclear power plant switchgear 100 is located in the power distribution system body.

[0068] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0069] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0071] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0072] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0074] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0075] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A nuclear power plant switchgear (100) for preventing malfunction of leakage current protection devices, characterized in that, include: The power distribution compartment (1) includes a compartment body (11) and a compartment door (12), wherein the compartment door (12) is rotatably connected to the compartment body (11); the compartment body (11) has an assembly cavity; A storage drawer (2) is movably disposed within the assembly cavity; the storage drawer (2) is provided with a receiving cavity (2a) and a mounting hole (2b) communicating with the receiving cavity (2a); the mounting hole (2b) is located on the side of the storage drawer (2) facing the door (12); The leakage current protection device (3) includes a leakage current sensor (31) and a leakage current relay (32); the leakage current sensor (31) is disposed in the receiving cavity (2a); the leakage current relay (32) is disposed in the mounting hole (2b) and is electrically connected to the leakage current sensor (31).

2. The nuclear power plant switchgear (100) according to claim 1, characterized in that, The leakage relay (32) includes: The main body (321) is inserted through the mounting hole (2b); the main body (321) is electrically connected to the leakage current sensor (31); A snap-fit ​​component (322) is provided on the side of the main body (321) facing the door (12) and abuts against the storage drawer (2); A locking member (323) is movably disposed on the periphery of the body member (321) and located in the receiving cavity (2a); the locking member (323) can move toward the snap-fit ​​member (322) to abut against the storage drawer (2) so that the leakage relay (32) is locked in the storage drawer (2).

3. The nuclear power plant switchgear (100) according to claim 2, characterized in that, The body component (321) has a locking boss (324) on its periphery, and the locking boss (324) has a threaded hole; the locking member (323) has an external thread; the locking member (323) passes through the threaded hole and extends from the side of the locking boss (324) facing the snap-fit ​​member (322).

4. The nuclear power plant switchgear (100) according to claim 3, characterized in that, The locking boss (324) is provided on two opposing peripheral sides of the body component (321); each locking boss (324) is threadedly connected to the locking member (323).

5. The nuclear power plant switchgear (100) according to claim 2, characterized in that, The main body (321) has a connector (325) on the side opposite to the snap-fit ​​(322); the main body (321) is electrically connected to the leakage current sensor (31) through the connector (325).

6. The nuclear power plant switchgear (100) according to claim 1, characterized in that, It also includes a buckle (4), which fits against the side of the storage drawer (2) facing the door (12) and is set corresponding to the mounting hole (2b); the buckle (4) is provided with an adapter hole (4a) communicating with the mounting hole (2b); the leakage current relay (32) passes through the adapter hole (4a); wherein the size of the adapter hole (4a) is adapted to the outer peripheral size of the leakage current relay (32).

7. The nuclear power plant switchgear (100) according to claim 6, characterized in that, The buckle (4) is made of PVC material.

8. The nuclear power plant switchgear (100) according to claim 2, characterized in that, The storage drawer (2) includes a bottom plate (21), a left side plate (22) and a right side plate (23) disposed on the bottom plate (21) and spaced apart, and a front plate (24) and a rear plate (25) disposed on the bottom plate (21) and spaced apart; the bottom plate (21), the left side plate (22), the right side plate (23), the front plate (24) and the rear plate (25) together form the receiving cavity (2a); The mounting hole (2b) is provided on the front plate (24).

9. The nuclear power plant switchgear (100) according to claim 8, characterized in that, The front panel (24) is provided with a handle (26); And / or, the rear plate (25) is provided with a first connector (27), and the compartment body (11) is provided with a second connector, wherein the first connector (27) is connected to the second connector.

10. A power distribution system for a nuclear power plant, characterized in that, include: The main body of the power distribution system; The nuclear power plant switchgear (100) for preventing malfunction of leakage protection device as described in any one of claims 1 to 9, wherein the nuclear power plant switchgear (100) is located on the main body of the power distribution system.

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