Nuclear power station low-voltage power distribution system

Abstract

The utility model discloses a low-voltage power distribution system of a nuclear power station. The low-voltage power distribution system comprises a cabinet body, a cabinet door, a positioning seat, a locking piece, a clamping piece and a locking assembly. When the low-voltage power distribution system of the nuclear power station is overhauled, the locking piece is used for shielding the isolation switch control hole, and the locking assembly is used for locking the relative position of the clamping piece and the locking piece, so that the problem that a worker opens the isolation switch through the isolation switch control hole due to misoperation is avoided; the locking assembly also limits the movement of the cabinet door relative to the positioning seat, can ensure that the cabinet door after power-off isolation cannot be opened, avoids the problem of electric shock risk caused by exposure of internal contacts of the cabinet body, achieves the effectiveness of isolation, protects a worker in charge, avoids the electric shock risk, and improves the safety in the maintenance process.

Description

Technical Field

[0001] The utility model relates to the field of maintenance of power distribution systems in nuclear power plants, in particular to a low-voltage power distribution system in a nuclear power plant. Background Art

[0002] The door of the low-voltage power distribution system integrated distribution switch used in a nuclear power plant can be opened after power failure and isolation, resulting in exposed contacts and failure to achieve effective isolation, which may cause electric shock risks. The existing technology is to directly lock the T-shaped keyhole of the low-voltage power distribution switch and hang an isolation sign to prohibit personnel from operating the low-voltage power distribution switch with warning information, but physical isolation cannot be achieved. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a low-voltage power distribution system for a nuclear power plant.

[0004] The technical solution adopted by the utility model to solve the technical problem is: construct a low-voltage power distribution system of a nuclear power plant, which includes a cabinet, a cabinet door, a positioning seat, a locking member, a positioning member and a locking assembly;

[0005] The cabinet door is movably connected to the cabinet body, and the cabinet door is provided with a through hole for the positioning seat to pass through;

[0006] The positioning seat is fixedly connected to the cabinet body. When the cabinet door is in a closed state relative to the cabinet body, the positioning seat is inserted into the through hole. The positioning seat is provided with an isolation knife switch control hole.

[0007] The locking member is limitedly connected to the positioning seat so that the locking member can only move along the length direction of the positioning seat to cover the isolation knife gate control hole or stagger with the isolation knife gate control hole, and the locking member is provided with a locking hole;

[0008] The clamping member is fixedly connected to the positioning seat, and a clamping hole is provided on the clamping member. When the locking member covers the isolation knife switch control hole, the locking hole is correspondingly connected to the clamping hole.

[0009] The locking assembly is connected to the locking member and the locking member to lock the relative positions of the locking member and the locking member and limit the movement of the cabinet door relative to the positioning seat.

[0010] In some embodiments, the locking assembly includes a first locking member and a second locking member, wherein the first locking member includes a main body, a connecting portion integrally formed with the main body, and a rotating shaft connected to the main body;

[0011] The second locking member includes a base portion and a connecting portion integrally formed with the base portion, and the base portion is rotatably connected to the main body portion through the rotating shaft.

[0012] In some embodiments, the width of the connecting portion is smaller than the diameter of the locking hole and the locking hole. When the locking member covers the isolation knife gate control hole, the connecting portion passes through the locking hole and the locking hole.

[0013] In some embodiments, at least one first locking hole is formed on the main body, and at least one second locking hole is formed on the base, and the first locking hole and the second locking hole are arranged correspondingly;

[0014] The base portion can rotate along the rotating shaft to connect the first locking hole with the second locking hole, or to stagger the first locking hole with the second locking hole.

[0015] In some embodiments, a diameter of the first locking hole is consistent with a diameter of the second locking hole.

[0016] In some embodiments, the main body portion has a main body side wall, the connecting portion has a connecting side wall, the base portion has a base side wall, and the connecting portion has a connecting side wall;

[0017] When the first locking hole is connected to the second locking hole, the main body side wall is flush with the base body side wall, and the connecting side wall is flush with the connecting side wall.

[0018] In some embodiments, the number of the first locking holes is three, and the three first locking holes are spaced apart and arranged along the length direction of the main body;

[0019] The number of the second locking holes is three, and the three second locking holes are spaced apart and arranged along the length direction of the base portion.

[0020] In some embodiments, the low-voltage power distribution system of a nuclear power plant further includes a padlock, and when the first locking hole is connected to the second locking hole, a locking beam of the padlock is inserted through the first locking hole and the second locking hole;

[0021] When the locking beam of the padlock is inserted into the first locking hole and the second locking hole, the lower portion of the locking assembly abuts against the surface of the cabinet door.

[0022] In some embodiments, the low-voltage power distribution system of the nuclear power plant also includes a circuit breaker installed in the cabinet and a switch handle connected to the circuit breaker and capable of controlling the operation of the circuit breaker, and the cabinet door is provided with a connecting hole for the switch handle to pass through.

[0023] In some embodiments, the low-voltage power distribution system of the nuclear power plant further includes an isolation knife switch installed in the cabinet and connected to the isolation knife switch control hole and a control key;

[0024] The control key can be inserted into the isolation knife switch control hole to control the action of the isolation knife switch.

[0025] The implementation of the utility model has the following beneficial effects: when the low-voltage power distribution system of a nuclear power plant is under maintenance, the isolation knife switch control hole is shielded by a locking piece, and the locking assembly is used to lock the relative positions of the positioning piece and the locking piece, thereby avoiding the problem of staff operating incorrectly and opening the isolation knife switch through the isolation knife switch control hole. At the same time, the locking assembly also limits the movement of the cabinet door relative to the positioning seat, which can ensure that the cabinet door cannot be opened after power failure and isolation, avoiding the risk of electric shock caused by exposed internal contacts of the cabinet, thereby achieving the effectiveness of isolation, protecting the person in charge of the work, avoiding the risk of electric shock, and improving safety during the maintenance process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0027] Figure 1 It is a schematic diagram of the overall structure of the low-voltage power distribution system of a nuclear power plant of the utility model;

[0028] Figure 2 yes Figure 1 The enlarged schematic diagram of point A in the middle;

[0029] Figure 3 It is a structural schematic diagram when the locking member and the isolation knife switch control hole are staggered;

[0030] Figure 4 It is a structural schematic diagram of the first locking member of the utility model;

[0031] Figure 5 It is a structural schematic diagram of the second locking member of the utility model;

[0032] Figure 6 It is a structural schematic diagram of the locking assembly of the utility model in an unlocked state;

[0033] Figure 7 It is a structural schematic diagram of the locking assembly of the utility model in a locked state. DETAILED DESCRIPTION

[0034] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0035] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0036] Reference Figures 1 to 7 , is a low-voltage power distribution system for a nuclear power plant in some embodiments of the utility model, which includes a cabinet body 1, a cabinet door 2, a positioning seat 3, a locking member 4, a positioning member 5 and a locking assembly 6.

[0037] like Figures 1 to 3 As shown, the cabinet door 2 is movably connected to the cabinet body 1, and the cabinet door 2 is provided with a through hole 21 for the positioning seat 3 to pass through. The positioning seat 3 is fixedly connected to the cabinet body 1. When the cabinet door 2 is in a closed state relative to the cabinet body 1, the positioning seat 3 passes through the through hole 21, and the positioning seat 3 is provided with an isolation knife switch control hole 31.

[0038] like Figure 3As shown, the locking member 4 is limitedly connected to the positioning seat 3, so that the locking member 4 only moves along the length direction of the positioning seat 3 to cover the isolation knife gate control hole 31 or staggered with the isolation knife gate control hole 31, and a locking hole 41 is provided on the locking member 4, and the locking member 5 is fixedly connected to the positioning seat 3, and a locking hole 51 is provided on the locking member 5. When the locking member 4 covers the isolation knife gate control hole 31, the locking hole 41 is correspondingly connected with the locking hole 51, and the locking assembly 6 is connected to the locking member 5 and the locking member 4 to lock the relative positions of the locking member 5 and the locking member 4, and limit the movement of the cabinet door 2 relative to the positioning seat 3.

[0039] It is understandable that when the low-voltage power distribution system of the nuclear power plant needs to be overhauled, the circuit breaker and the knife switch need to be disconnected to realize the power-off operation of the power distribution switch. During the overhaul process, there is a problem that the cabinet door 2 can be opened, resulting in the exposure of the internal contacts of the cabinet body 1, which may cause the risk of electric shock and fail to achieve effective isolation. At the same time, there is a problem that the staff mistakenly opens the isolation knife switch through the isolation knife switch control hole 31, which also causes the risk of electric shock. Therefore, in this embodiment, when the low-voltage power distribution system of the nuclear power plant is overhauled, the locking member 4 is used to cover the isolation knife switch control hole 31, and the locking assembly 6 is used to lock the relative position of the positioning member 5 and the locking member 4, so as to avoid the problem that the staff mistakenly opens the isolation knife switch through the isolation knife switch control hole 31. At the same time, the locking assembly 6 also limits the movement of the cabinet door 2 relative to the positioning seat 3, which can ensure that the cabinet door 2 cannot be opened after power-off isolation, and avoid the problem of the risk of electric shock caused by the exposure of the internal contacts of the cabinet body 1, so as to achieve the effectiveness of isolation, protect the person in charge of the work, avoid the risk of electric shock, and improve the safety during the overhaul process.

[0040] like Figure 4 and Figure 5 As shown, the locking assembly 6 includes a first locking member 61 and a second locking member 62. The first locking member 61 includes a main body 611, a connecting portion 612 integrally formed with the main body 611, and a rotating shaft 613 connected to the main body 611. The second locking member 62 includes a base portion 621 and a connecting portion 622 integrally formed with the base portion 621. The base portion 621 is rotatably connected to the main body 611 via the rotating shaft 613. The first locking member 61 is generally J-shaped, and the second locking member 62 is generally L-shaped. The second locking member 62 can freely rotate relative to the first locking member 61.

[0041] Furthermore, the width of the connecting portion 612 is smaller than the diameter of the locking hole 41 and the locking hole 51. When the locking member 4 covers the isolation knife switch control hole 31, the connecting portion 612 is passed through the locking hole 41 and the locking hole 51, and the connecting portion 612 can be freely inserted into and pulled out of the locking hole 41 and the locking hole 51.

[0042] like Figures 4 to 7As shown, at least one first locking hole 6111 is formed on the main body 611, and at least one second locking hole 6211 is formed on the base 621. The first locking hole 6111 and the second locking hole 6211 are arranged correspondingly. The base 621 can rotate along the rotating shaft 613 to make the first locking hole 6111 communicate with the second locking hole 6211, or to make the first locking hole 6111 staggered with the second locking hole 6211. The main body 611 has a main body side wall 6112, the connecting part 612 has a connecting side wall 6121, the base 621 has a base side wall 6212, and the connecting part 622 has a connecting side wall 6221. When the first locking hole 6111 is connected with the second locking hole 6211, the main body side wall 6112 is arranged flush with the base side wall 6212, and the connecting side wall 6121 is arranged flush with the connecting side wall 6221. When the main body side wall 6112 is flush with the base side wall 6212 and the connecting side wall 6121 is flush with the connecting side wall 6221, the locking assembly 6 as a whole forms a rectangular structure, and the lower part of the rectangular structure can block the cabinet door 2 so that the cabinet door 2 cannot be opened.

[0043] like Figure 2 As shown, the low-voltage power distribution system of the nuclear power plant further includes a padlock 7. When the first locking hole 6111 is connected to the second locking hole 6211, the lock beam of the padlock 7 is inserted through the first locking hole 6111 and the second locking hole 6211. It can be understood that when the low-voltage power distribution system of the nuclear power plant needs to be repaired, the connecting portion 612 can be used to be inserted through the locking hole 41 and the positioning hole 51, and then the main body 611 is kept stationary, and the base 621 is rotated around the rotating shaft 613 until the first locking hole 6111 is connected to the second locking hole 6211, and then the padlock 7 is locked by inserting the lock beam of the padlock 7 through the first locking hole 6111 and the second locking hole 6211. At the same time, when the locking beam of the padlock 7 is inserted into the first locking hole 6111 and the second locking hole 6211, the lower part of the locking assembly 6 abuts against the surface of the cabinet door 2, limiting the movement of the cabinet door 2 relative to the positioning seat 3, thereby ensuring that the cabinet door 2 cannot be opened after power failure and isolation, avoiding the risk of electric shock caused by exposed internal contacts of the cabinet body 1, and achieving the effectiveness of isolation.

[0044] In addition, the diameter of the first locking hole 6111 is consistent with the diameter of the second locking hole 6211, and the diameter of the first locking hole 6111 and the diameter of the second locking hole 6211 are larger than the diameter of the locking beam of the padlock 7, which can accommodate the free entry and exit of the locking beam of the padlock 7, and can also prevent the relative movement of the first locking member 61 and the second locking member 62 after the padlock 7 is locked. Preferably, the diameter of the first locking hole 6111 and the diameter of the second locking hole 6211 can be 9 mm.

[0045] In this embodiment, the number of the first locking holes 6111 is three, and the three first locking holes 6111 are separated and arranged along the length direction of the main body 611. The number of the second locking holes 6211 is three, and the three second locking holes 6211 are separated and arranged along the length direction of the base 621. The locking beam of the padlock 7 can be passed through one of the first locking holes 6111 and the corresponding second locking hole 6211. In some other embodiments, the number of the first locking holes 6111 and the second locking holes 6211 can be set according to actual conditions, and no specific limitation is made here. Preferably, the center distance between each adjacent first locking hole 6111 or each adjacent second locking hole 6211 is 9 mm.

[0046] In addition, the low-voltage power distribution system of the nuclear power plant also includes a circuit breaker installed in the cabinet 1 and a switch handle 8 connected to the circuit breaker and capable of controlling the operation of the circuit breaker. The cabinet door 2 is provided with a connecting hole for the switch handle 8 to pass through. The low-voltage power distribution system of the nuclear power plant also includes an isolating knife switch installed in the cabinet 1 and connected to the isolating knife switch control hole 31, and a control key. The control key can be inserted into the isolating knife switch control hole 31 to control the operation of the isolating knife switch. Rotating the switch handle 8 can control the connection and disconnection of the circuit breaker, and the control key can control the connection and disconnection of the isolating knife switch. The above-mentioned use of the switch handle 8 to control the operation of the circuit breaker and the use of the control key inserted into the isolating knife switch control hole to control the operation of the isolating knife switch are both existing mature technologies of the distribution system, which will not be repeated here.

[0047] The specific maintenance process of the low-voltage power distribution system of the nuclear power plant is as follows:

[0048] 1. First, rotate the switch handle 8 to disconnect the circuit breaker, then use the control key to insert the isolation knife control hole 31 and rotate the isolation knife to disconnect it, so as to realize the power-off operation of the distribution switch;

[0049] 2. Move the locking member 4 to cover the isolation knife gate control hole 31, and at the same time, the locking hole 41 is connected to the locking hole 51. At this time, the connecting part 612 can be used to penetrate the locking hole 41 and the locking hole 51, and then keep the main body 611 immobile, press Figure 6 In the direction shown, the base portion 621 is rotated around the rotating shaft 613 until the first locking hole 6111 is connected to the second locking hole 6211;

[0050] 3. The lock beam of the padlock 7 is passed through the first locking hole 6111 and the second locking hole 6211, and the padlock 7 is locked. At this time, the lower part of the locking assembly 6 abuts against the surface of the cabinet door 2, restricting the movement of the cabinet door 2 relative to the positioning seat 3, and ensuring that the cabinet door 2 cannot be opened after power failure and isolation;

[0051] 4. When the maintenance work is completed, unlock the padlock 7, rotate the base 621, and then make the connecting part 612 withdraw from the locking hole 41 and the positioning hole 51, and then move the locking part 4 to make it misaligned with the isolation switch control hole 31, insert the control key into the isolation switch control hole 31 and rotate the isolation switch to turn it on, and finally use the rotary switch handle 8 to turn on the circuit breaker. At this time, the low-voltage power distribution system of the nuclear power plant resumes normal power distribution function.

[0052] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A low voltage power distribution system for a nuclear power plant, characterized in that: It comprises a cabinet body (1), a cabinet door (2), a positioning seat (3), a locking member (4), a locking member (5) and a locking assembly (6); The cabinet door (2) is movably connected to the cabinet body (1), and the cabinet door (2) is provided with a through hole (21) for the positioning seat (3) to pass through; The positioning seat (3) is fixedly connected to the cabinet body (1); when the cabinet door (2) is in a closed state relative to the cabinet body (1), the positioning seat (3) is inserted into the through hole (21); an isolation knife switch control hole (31) is provided on the positioning seat (3); The locking member (4) is connected to the positioning seat (3) in a limiting manner so that the locking member (4) only moves along the length direction of the positioning seat (3) to cover the isolation knife gate control hole (31) or stagger with the isolation knife gate control hole (31), and a locking hole (41) is provided on the locking member (4); The locking member (5) is fixedly connected to the positioning seat (3), and a locking hole (51) is provided on the locking member (5). When the locking member (4) covers the isolation knife switch control hole (31), the locking hole (41) is correspondingly connected to the locking hole (51); The locking assembly (6) is connected to the locking member (5) and the locking member (4) to lock the relative positions of the locking member (5) and the locking member (4) and to limit the movement of the cabinet door (2) relative to the positioning seat (3).

2. The low-voltage power distribution system of a nuclear power plant according to claim 1, characterized in that: The locking assembly (6) comprises a first locking member (61) and a second locking member (62); the first locking member (61) comprises a main body (611), a connecting portion (612) integrally formed with the main body (611), and a rotating shaft (613) connected to the main body (611); The second locking member (62) comprises a base portion (621) and a connecting portion (622) formed integrally with the base portion (621), and the base portion (621) is rotatably connected to the main body portion (611) via the rotating shaft (613).

3. The low-voltage power distribution system of a nuclear power plant according to claim 2, characterized in that: The width of the connecting portion (612) is smaller than the diameters of the locking hole (41) and the locking hole (51); when the locking member (4) covers the isolation knife switch control hole (31), the connecting portion (612) is inserted into the locking hole (41) and the locking hole (51).

4. The low-voltage power distribution system of a nuclear power plant according to claim 3, characterized in that: The main body (611) is provided with at least one first locking hole (6111), and the base (621) is provided with at least one second locking hole (6211), and the first locking hole (6111) and the second locking hole (6211) are arranged correspondingly; The base portion (621) is capable of rotating along the rotating shaft (613) so that the first locking hole (6111) is connected to the second locking hole (6211), or the first locking hole (6111) is staggered with the second locking hole (6211).

5. The low-voltage power distribution system of a nuclear power plant according to claim 4, characterized in that: The diameter of the first locking hole (6111) is consistent with the diameter of the second locking hole (6211).

6. The low voltage power distribution system of a nuclear power plant according to claim 4, characterized in that: The main body portion (611) has a main body side wall (6112), the connecting portion (612) has a connecting side wall (6121), the base portion (621) has a base side wall (6212), and the connecting portion (622) has a connecting side wall (6221); When the first locking hole (6111) is connected to the second locking hole (6211), the main body side wall (6112) is flush with the base side wall (6212), and the connecting side wall (6121) is flush with the connecting side wall (6221).

7. The low voltage power distribution system of a nuclear power plant according to claim 4, characterized in that: The number of the first locking holes (6111) is three, and the three first locking holes (6111) are arranged separately along the length direction of the main body (611); The number of the second locking holes (6211) is three, and the three second locking holes (6211) are spaced apart along the length direction of the base portion (621).

8. The low voltage power distribution system of a nuclear power plant according to claim 4, characterized in that: The nuclear power plant low-voltage power distribution system further comprises a padlock (7), and when the first locking hole (6111) is connected to the second locking hole (6211), a locking beam of the padlock (7) is inserted into the first locking hole (6111) and the second locking hole (6211); When the locking beam of the padlock (7) is inserted into the first locking hole (6111) and the second locking hole (6211), the lower part of the locking assembly (6) abuts against the surface of the cabinet door (2).

9. The low-voltage power distribution system of a nuclear power plant according to claim 1, characterized in that: The low-voltage power distribution system of the nuclear power plant further comprises a circuit breaker installed in the cabinet (1) and a switch handle (8) connected to the circuit breaker and capable of controlling the operation of the circuit breaker. The cabinet door (2) is provided with a connecting hole for the switch handle (8) to pass through.

10. The low voltage power distribution system of a nuclear power plant according to claim 1, characterized in that: The low-voltage power distribution system of the nuclear power plant further comprises an isolation knife switch installed in the cabinet (1) and connected to the isolation knife switch control hole (31), and a control key; The control key can be inserted into the isolation knife switch control hole (31) to control the action of the isolation knife switch.

Images