Power distribution device of nuclear power station cabinet

Abstract

The utility model discloses a power distribution device of a nuclear power station cabinet, the device comprises a box power supply, a power distribution assembly and assembly boxes, the box power supply is connected with the power distribution assembly, each assembly box is internally provided with a power distribution card, the power distribution cards are connected in parallel, and two power distribution cards are connected with the power distribution assembly. According to the scheme, when a downstream card is powered off due to an open circuit of a doubling wire nose, power can be directly supplied to the power distribution cards connected with the power distribution assembly through the power distribution assembly, and compared with a power supply mode that the power distribution cards are simply connected in series in the prior art, the scheme has higher reliability, and the power supply failure rate of each layer of assembly box can be reduced.

Description

Technical Field

[0001] This application belongs to the field of non-safety equipment modification of nuclear power plants, and specifically relates to a power distribution device for a nuclear power plant cabinet. Background Technology

[0002] The nuclear power plant process instrumentation control cabinet system is not a conventional process or flow control system. This system fundamentally addresses the design of some equipment, such as electrical cabinets and instrument panels, whose channels are shared with other basic systems. The system's function is to process measurement signals from control and protection instruments of other process systems. The ±15V power distribution path within the nuclear power plant process instrumentation control cabinet system is as follows: power is distributed sequentially from the power bus to each power distribution card. If there is an open circuit in the power line or parallel line lug, it will cause power loss to downstream cards. Existing power supply methods for nuclear power plant cabinets have relatively low power reliability.

[0003] Existing patent CN110021890A discloses a power distribution box for server racks, including a box body. The box body includes a front panel and a rear panel. The front panel has a front window, and the rear panel has several cable outlet holes and several incoming terminal blocks. Several circuit breakers are installed inside the box body, and the switching parts of the circuit breakers protrude through the front window. The ends of the several incoming terminal blocks located inside the box body are electrically connected to the corresponding incoming terminals of the circuit breakers. Incoming lines are connected to the ends of the several incoming terminal blocks located outside the box body. Outgoing lines are connected to the outgoing terminals of the several circuit breakers. The power distribution box also includes a cantilever section, which is detachably connected to the rear panel. Several outgoing terminal blocks are installed on the cantilever section. The outgoing lines pass through the cable outlet holes and connect to the incoming terminals of the corresponding outgoing terminal blocks.

[0004] Existing patent CN112153849B discloses a power distribution box for a communication equipment cabinet, relating to the field of communication technology. Specifically, it is a power distribution box for a communication equipment cabinet, including a lightning protection base shell with an inwardly recessed rectangular groove inside. This power distribution box for communication equipment cabinet, by creating a groove on the top of a protective smooth base and movably connecting a line circuit breaker within the groove, and movably connecting symmetrically distributed shock-absorbing and stabilizing plates inside the protective smooth base, uses fixing nuts at the bottom of the shock-absorbing and stabilizing plates to stably fix symmetrically distributed external positioning plates to the outside of the line circuit breaker. Simultaneously, an anti-sway top plate is movably connected to the inside of the external positioning plates. This ensures that maintenance personnel can quickly repair the line circuit breaker inside the device when it malfunctions.

[0005] In summary, neither of the two existing patents mentioned above has solved the problem of low power supply reliability in nuclear power plant cabinets in the prior art. Summary of the Invention

[0006] To achieve the above objectives, this application proposes a power distribution device for a nuclear power plant cabinet, which solves the problem of low power supply reliability of nuclear power plant cabinets in the prior art.

[0007] A power distribution device for a nuclear power plant cabinet includes a box power supply, a power distribution component and a component box. The box power supply is connected to the power distribution component. Each component box contains a power distribution card. The power distribution cards are connected in parallel with each other, and there are two power distribution cards connected to the power distribution component.

[0008] Furthermore, the component boxes are arranged sequentially from top to bottom, and the power distribution cards located at the beginning and end of the component boxes are connected to the power distribution components.

[0009] Furthermore, the power distribution component includes several channels, with the first, second, and third channels all connected to the power distribution cards located in the component boxes at both ends via cables.

[0010] Furthermore, the first channel, the second channel, and the third channel are respectively a +15V DC voltage channel, a -15V DC voltage channel, and a COM ground channel.

[0011] Furthermore, the power distribution card includes three power interfaces: a +15V DC voltage interface, a COM interface, and a -15V DC voltage interface.

[0012] Furthermore, the channel is equipped with eight power interfaces. The fifth power interface of the first, second and third channels are connected in sequence to the +15V DC voltage interface, -15V DC voltage interface and COM interface of the power distribution card located in the component box at the head end.

[0013] Furthermore, the eighth power interface of the first, second, and third channels are sequentially connected to the +15V DC voltage interface, -15V DC voltage interface, and COM interface of the power distribution card located in the component box at the end.

[0014] Furthermore, the power supply of the box is connected to the first power interface of the first channel, the second channel, and the third channel, respectively.

[0015] Furthermore, the power supply unit is connected to an external power source, which supplies power to the power supply unit.

[0016] Furthermore, the external power supply is a 220V, 50Hz three-phase power supply.

[0017] Based on the above technical solution, this application has at least the following beneficial effects:

[0018] 1. This application solves the problem of low power supply reliability of nuclear power plant cabinets in the prior art by connecting the power distribution components corresponding to the component box in parallel and connecting two power distribution cards to the power distribution components. When the parallel line lug is open and the downstream card loses power, the power distribution components directly supply power to the power distribution cards connected to the power distribution components.

[0019] 2. Compared with the existing technology that simply connects each power distribution card in series, this application has higher reliability. The power supply failure rate of the component box at the first end is reduced by about 80%, the power supply failure rate of the component box at the second layer is reduced by about 70%, and the power supply failure rate of the component box at the third layer is reduced by about 60%. The overall power supply reliability of the cabinet is significantly improved. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is a schematic diagram of a power distribution device for a nuclear power plant P cabinet in a specific embodiment of this application;

[0022] Figure 2 This is a schematic diagram of a power distribution device for a nuclear power plant C cabinet in a specific embodiment of this application.

[0023] The above figures include the following reference numerals:

[0024] 100. Power supply box; 101. First power distribution card; 102. Second power distribution card; 103. Third power distribution card; 104. Fourth power distribution card; 105. Fifth power distribution card; 110. First component box; 111. Second component box; 112. Third component box; 113. Fourth component box; 114. Fifth component box; 115. Sixth component box; 200. Power distribution component; 201. First channel; 202. Second channel; 203. Third channel; 204. Fourth channel; 205. Fifth channel; 300. External power supply; 400. Chassis. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0027] In this description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0028] Example

[0029] The nuclear power plant process instrumentation and control cabinet system comprises 16 protection cabinets (P cabinets) and 20 control cabinets (C cabinets). Both types of cabinets include a power distribution unit, which consists of a power supply box, power distribution components, and component boxes. The power supply box is connected to the power distribution components. Each component box contains a power distribution card, and the power distribution cards are connected in parallel. Two power distribution cards are also connected to the power distribution components. When an open circuit in the parallel line leads to a power loss in a downstream card, power can be directly supplied to the power distribution card connected to the power distribution components through the power distribution components, thereby reducing the probability of failure in each component box.

[0030] like Figure 1 The diagram shows a schematic of a power distribution device for a nuclear power plant P-cabinet according to a specific embodiment of this application. Figure 1 As can be seen from the diagram, the device includes a power supply box 100, a power distribution assembly 200, and five component boxes (first component box 110, second component box 111, third component box 112, fourth component box 113, and fifth component box 114). The power supply box 100 is connected to the power distribution assembly 200. The five component boxes are arranged sequentially from top to bottom, and each component box contains a corresponding power distribution card. The power distribution cards are connected in parallel. Specifically, the power distribution cards are named, from top to bottom, first power distribution card 101, second power distribution card 102, third power distribution card 103, fourth power distribution card 104, and fifth power distribution card 105. Figure 1 As can be seen from the diagram, the fourth power distribution card 104 is connected in parallel with the third power distribution card 103 and the fifth power distribution card 105 via three cables.

[0031] It should be noted that this application defines the position of the topmost component box as the beginning and the position of the bottommost component box as the end. For example, in this embodiment, the first component box 110 is located at the beginning, and the fifth component box 114 is located at the end. The first power distribution card 101 of the first component box 110 and the fifth power distribution card 105 of the fifth component box 114 are both connected to the power distribution component 200. In specific implementation, a double-pressure process is used at the first component box 110. After stripping the wires between the first power distribution card 101 of the first component box 110 and the power distribution component 200, and between the first power distribution card 101 of the first component box 110 and the second power distribution card 102 of the second component box 111, the wires are inserted into the same lug and crimped or soldered, and finally connected to the terminal block without changing the existing terminal block state.

[0032] Furthermore, each power distribution card in this embodiment includes three power interfaces: a +15V DC voltage interface, a COM interface, and a -15V DC voltage interface.

[0033] The power distribution component 200 includes five channels, corresponding to... Figure 1 The circuit consists of five channels: 201 (first channel), 202 (second channel), 203 (third channel), 204 (fourth channel), and 205 (fifth channel). This solution only involves the first channel (201), the second channel (202), and the third channel (203). Specifically, the first, second, and third channels are respectively a +15V DC voltage channel, a -15V DC voltage channel, and a COM ground channel. Furthermore, the first channel (201), the second channel (202), and the third channel (203) are all connected to the first power distribution card 101 and the fifth power distribution card 105.

[0034] Each channel is equipped with eight power interfaces. The fifth power interface of the first channel 201, the second channel 202, and the third channel 203 is sequentially connected to the +15V DC voltage interface, the -15V DC voltage interface, and the COM interface of the first power distribution card 101. The eighth power interface of the first channel 201, the second channel 202, and the third channel 203 is sequentially connected to the +15V DC voltage interface, the -15V DC voltage interface, and the COM interface of the fifth power distribution card.

[0035] Furthermore, three cables—+15V, -15V, and COM—are drawn from the power supply unit 100 and respectively enter the first power interface of the first channel 201, the second channel 202, and the third channel 203. The power supply unit 100 distributes power through the power distribution component 200. Subsequently, two power supplies are drawn from the fifth and eighth power interfaces of the first, second, and third channels 201 and 202, and 203, respectively, to power the component boxes in the cabinet. The third and fourth power interfaces of the first, second, and third channels 201 and 202, and 203, respectively, provide power to other devices.

[0036] Furthermore, the power supply box 100 is connected to the external power supply 300, which supplies power to the power distribution component 200 through the power supply box 100. In this embodiment, the external power supply is a 220V, 50Hz three-phase four-wire power supply. After being transformed by the power supply box 100, it outputs ±15V power, which is then distributed by the power distribution component 200 according to power demand. Specifically, in this embodiment, the neutral wire of the four wires of the external power supply 300 is grounded, and the three live wires are connected to the power supply box 100. After transformation, the output is +15V, -15V, and COM power, and a grounding wire is also led out. Figure 1 and Figure 2 The rectangular strips on both sides and the bottom are grounding copper busbars, serving as grounding protection. In addition, Figure 1 The chassis 400 shown is a third-party device without signal and connected to an external power supply 300, which is arranged in the cabinet and is independent of this system, so it will not be described in detail.

[0037] like Figure 2 The diagram shows a schematic of a power distribution device for a nuclear power plant C-cabinet according to a specific embodiment of this application. The device includes a cabinet power supply 100, a power distribution assembly 200, and six assembly boxes (first assembly box 110, second assembly box 111, third assembly box 112, fourth assembly box 113, fifth assembly box 114, and sixth assembly box 115). The power distribution principle of this cabinet is similar to... Figure 1 The power distribution principle of the P cabinet shown is basically the same, so it will not be described again here.

[0038] In summary, as can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0039] 1. This application solves the problem of low power supply reliability of nuclear power plant cabinets in the prior art by connecting the power distribution components corresponding to the component box in parallel and connecting two power distribution cards to the power distribution components. When the parallel line lug is open and the downstream card loses power, the power distribution components directly supply power to the power distribution cards connected to the power distribution components.

[0040] 2. Compared with the existing technology that simply connects each power distribution card in series, this application has higher reliability. The power supply failure rate of the component box at the first end is reduced by about 80%, the power supply failure rate of the component box at the second layer is reduced by about 70%, and the power supply failure rate of the component box at the third layer is reduced by about 60%. The overall power supply reliability of the cabinet is significantly improved.

[0041] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power distribution device for a nuclear power plant cabinet, the device comprising a cabinet power supply, power distribution components, and component boxes, wherein the cabinet power supply is connected to the power distribution components, and each component box contains a power distribution card, characterized in that, The power distribution cards are connected in parallel, and two power distribution cards are connected to the power distribution assembly.

2. The apparatus according to claim 1, characterized in that, The component boxes are arranged sequentially from top to bottom, and the power distribution cards located in the component boxes at both ends are connected to the power distribution components.

3. The apparatus according to claim 2, characterized in that, The power distribution component includes several channels, and the first channel, the second channel and the third channel are all connected to the power distribution card located in the component box at both ends via cables.

4. The apparatus according to claim 3, characterized in that, The first channel, the second channel, and the third channel are respectively a +15V DC voltage channel, a -15V DC voltage channel, and a COM ground channel.

5. The apparatus according to claim 4, characterized in that, The power distribution card includes three power interfaces: a +15V DC voltage interface, a COM interface, and a -15V DC voltage interface.

6. The apparatus according to claim 5, characterized in that, The channel is provided with eight power interfaces. The fifth power interface of the first channel, the second channel and the third channel are connected in sequence to the +15V DC voltage interface, the -15V DC voltage interface and the COM interface of the power distribution card located in the component box at the head end.

7. The apparatus according to claim 6, characterized in that, The eighth power interface of the first channel, the second channel, and the third channel are sequentially connected to the +15V DC voltage interface, the -15V DC voltage interface, and the COM interface of the power distribution card located in the component box at the end.

8. The apparatus according to claim 6, characterized in that, The power supply of the box is connected to the first power interface of the first channel, the second channel, and the third channel, respectively.

9. The apparatus according to any one of claims 1 to 8, characterized in that, The power supply unit is connected to an external power source, which provides power to the power supply unit.

10. The apparatus according to claim 9, characterized in that, The external power supply is a 220V, 50Hz three-phase power supply.

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