Power supply circuit and power supply device for electrical panel of nuclear power unit

Abstract

The utility model provides a nuclear power unit electrical panel power supply circuit and a power supply device. The nuclear power unit electrical panel power supply circuit comprises a branch box, a downstream double-cut switch, a first column of electrical panels, a second column of electrical panels and a third column of electrical panels, the input end of the branch box is connected with the output end of the first column of electrical panels, and the output end of the branch box is connected with the input ends of electric equipment on the second column of electrical panels and the third column of electrical panels; the input end of the downstream double-cut switch is connected with the output end of the branch box and the second-column power distribution row of the second-column electrical panel or the third-column power distribution row of the third-column electrical panel, and the output end of the downstream double-cut switch is connected with electric equipment. According to the utility model, the electrical equipment on the first column of electrical panels, the second column of electrical panels and the third column of electrical panels are connected through the branch box, so that the power supply requirements of the electrical equipment on the second column of electrical panels and the third column of electrical panels in a parallel maintenance state are met; the problem of power supply requirements of corresponding equipment of a nuclear power unit during parallel maintenance of two rows of electrical panels is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power operation, in particular to an electrical panel power supply circuit and a power supply device for a nuclear power unit. Background Art

[0002] The power supply circuit of the electrical panel (electrical control panel) of the nuclear power unit is used to ensure the safety and stable operation of the nuclear power unit. During the major overhaul of the nuclear power unit, it is necessary to stop the third column of electrical panels for maintenance. Since the maintenance period is relatively long, on the basis of the previous serial maintenance of the third column of electrical panels, an improved parallel maintenance scheme for two columns of electrical panels is proposed to obtain the benefit of the major overhaul period.

[0003] During the parallel maintenance of two columns of electrical panels in the nuclear power unit, compared with the previous serial maintenance method, the situation where the first column of electrical panels does not operate is increased. Therefore, corresponding power supply measures need to be taken to ensure the power supply requirements of the corresponding equipment of the nuclear power unit during the parallel maintenance of the two columns of electrical panels.

[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present utility model and does not constitute any limitation to the present utility model. Summary of the Utility Model

[0005] In view of the above-mentioned disadvantages of the prior art, the present utility model provides an electrical panel power supply circuit and a power supply device for a nuclear power unit. The first column of electrical panels is connected to the electrical equipment on the second column of electrical panels and the third column of electrical panels through a tapping box, so as to meet the power supply requirements of the electrical equipment on the second column of electrical panels and the third column of electrical panels in the parallel maintenance state, and solve the problem of the power supply requirements of the corresponding equipment of the nuclear power unit during the parallel maintenance of the two columns of electrical panels.

[0006] The present utility model provides an electrical panel power supply circuit for a nuclear power unit, which includes a tapping box, and the first column of electrical panels, the second column of electrical panels, and the third column of electrical panels respectively connected with electrical equipment; the input end of the tapping box is connected to the output end of the first column of electrical panels, and the output end of the tapping box is connected to the input ends of the electrical equipment on the second column of electrical panels and the third column of electrical panels.

[0007] In an embodiment of the present utility model, the first column of electrical panels further includes a first column of distribution boards connected to its output end, and the input end of the tapping box is connected to the output end of the first column of distribution boards.

[0008] In an embodiment of the present utility model, a re-power supply interface is further provided on the line between the first column of electrical panels and the first column of distribution boards, and a re-power supply electrical panel is connected to the re-power supply interface.

[0009] In an embodiment of the present utility model, the output ends of the tap box are respectively connected to two electrical devices of the second column of electrical panels and two electrical devices of the third column of electrical panels.

[0010] In an embodiment of the present utility model, an upstream double-switch is used to connect the first column of electrical panels and the first column of power distribution rows, and a downstream double-switch is used to connect the tap box and the electrical devices.

[0011] In an embodiment of the present utility model, the input end of the upstream double-switch is connected to the output end of the first column of electrical panels or the re-power supply electrical panel, and the output end of the upstream cut-off switch is connected to the first column of power distribution rows.

[0012] In an embodiment of the present utility model, the input end of the downstream double-switch is connected to the output end of the tap box and the second column of power distribution rows of the second column of electrical panels or the third column of power distribution rows of the third column of electrical panels, and the output end of the downstream double-switch is connected to the electrical devices.

[0013] In an embodiment of the present utility model, the first column of electrical panels and the re-power supply electrical panel are DC power sources.

[0014] In an embodiment of the present utility model, the electrical devices are network-related cabinets.

[0015] The present utility model also provides a power supply device for the electrical panels of a nuclear power unit, and the power supply device adopts the above-mentioned power supply circuit.

[0016] The beneficial effects of the present utility model are as follows: By using one column of electrically-operated electrical panels as the power source for the electrical devices on the two columns of electrical panels in the shutdown and maintenance state, the power supply requirements of the electrical devices during the parallel maintenance of the two columns of electrical panels under the overhaul condition are met, and the wiring method of the tap box is adopted to meet the power supply requirements through the third column of electrical panels when any two columns of electrical panels among the three columns of electrical panels perform parallel maintenance.

[0017] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with the present utility model, and are used together with the specification to explain the principles of the present utility model. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0019] Figure 1 It is a schematic diagram of the power supply circuit for the electrical panels of the nuclear power unit of the present utility model.

[0020] In the figure: 1. The first column of electrical panels; 10. The first column of distribution buses; 11. The re-power supply interface; 12. The upstream double-throw switch; 13. The downstream double-throw switch; 20. The second column of distribution buses; 30. The third column of distribution buses; 4. Electrical equipment; 5. Tap box; 6. Re-power supply electrical panel. Detailed implementation mode

[0021] The following uses specific specific examples to illustrate the implementation mode of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. It should also be understood that the terms used in the embodiments of the present invention are for describing specific specific implementation schemes, rather than for limiting the protection scope of the present invention.

[0022] Please refer to Figure 1 . It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limited conditions under which the present invention can be implemented. Therefore, they do not have technical substantive significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms used in this specification to refer to positions, quantity relationships, etc. are only for the convenience of clear narration, rather than for limiting the scope under which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0023] Please refer to Figure 1 , the present invention provides a power supply circuit for the electrical panel of a nuclear power unit, including a tap box 5 and the first column of electrical panels 1, the second column of electrical panels, and the third column of electrical panels respectively connected to electrical equipment 4; the input end of the tap box 5 is connected to the output end of the first column of electrical panels 1, and the output end of the tap box 5 is connected to the input ends of the electrical equipment 4 on the second column of electrical panels and the third column of electrical panels.

[0024] Specifically, when the three columns of electrical panels in the nuclear power unit adopt the two-column power supply parallel maintenance method, that is, two of the three columns of electrical panels are in the shutdown state for maintenance, and there is still one column of electrical panels in the live operating state. Therefore, one column of live operating electrical panels can be used as the power supply for the electrical equipment 4 on the two columns of electrical panels in the shutdown maintenance state, meeting the power supply requirements of the electrical equipment 4 during the parallel maintenance of the two columns of electrical panels under the overhaul working condition.

[0025] In the embodiment of the present utility model, the first column of electrical panels 1 is in an operating state during parallel maintenance, and the second column of electrical panels and the third column of electrical panels are the two columns of electrical panels for performing parallel maintenance. That is to say, the first column of electrical panels 1, the second column of electrical panels, and the third column of electrical panels do not specifically refer to a certain fixed column of electrical panels, but respectively represent a column of electrical panels in a live operating state and two columns of electrical panels in a parallel maintenance state under the overhaul condition of a nuclear power unit.

[0026] In this way, the present utility model realizes the connection between the first column of electrical panels 1 and the electrical equipment 4 on the second column of electrical panels and the third column of electrical panels through the tapping box 5, so as to meet the power supply requirements of the electrical equipment 4 on the second column of electrical panels and the third column of electrical panels in the parallel maintenance state.

[0027] In one embodiment, the first column of electrical panels 1 further includes a first column of distribution buses 10 connected to its output end, and the input end of the tapping box 5 is connected to the output end of the first column of distribution buses 10.

[0028] Specifically, there is a certain distance between the specific positions of each column of electrical panels in the nuclear power unit corresponding to the plant rooms. For the tapping box 5 solution, corresponding wiring needs to be carried out between different columns of electrical panels. Therefore, the first column of distribution buses 10 close to the second column of electrical panels and the third column of electrical panels in the first column of electrical panels 1 can be selected for wiring operations, or according to the civil engineering situation of the on-site facilities, the one in the first column of electrical panels 1 that is easy to carry out wiring operations can be selected as the first column of distribution buses 10 for use. In this way, the wiring operation with the tapping box 5 can be carried out conveniently.

[0029] In one embodiment, a re-power supply interface 11 is further provided on the line between the first column of electrical panels 1 and the first column of distribution buses 10, and a re-power supply electrical panel 6 is connected to the re-power supply interface 11.

[0030] Furthermore, the first column of electrical panels 1 and the first column of distribution buses 10 are connected by an upstream double-switch 12, and the tapping box 5 and the electrical equipment 4 are connected by a downstream double-switch 13. The first column of electrical panels 1 and the re-power supply electrical panel 6 are DC power sources. The electrical equipment 4 is a network-connected cabinet.

[0031] Even further, the input end of the upstream double-switch 12 is connected to the output end of the first column of electrical panels 1 or the re-power supply electrical panel 6, and the output end of the upstream cut-off switch is connected to the first column of distribution buses 10. The input end of the downstream double-switch 13 is connected to the output end of the tapping box 5 and the second column of distribution buses 20 of the second column of electrical panels or the third column of distribution buses 30 of the third column of electrical panels, and the output end of the downstream double-switch 13 is connected to the electrical equipment 4.

[0032] Specifically, in the embodiment of the present utility model, the re-power supply interface 11 and the upstream double-switch 12 are provided to connect to an external re-power supply, so as to form two power supplies together with the first electrical panel as the power supply, meeting the requirement in the national standard that the DC power supplies of two sets of devices are taken from different columns of power supplies. By setting the connection terminals of the downstream double-switch 13, when the second-column electrical panel and the third-column electrical panel are in a de-energized maintenance state in parallel, the electrical equipment 4 on their respective second-column distribution boards 20 and third-column distribution boards 30 is connected to the tapping box 5 through the downstream double-switch 13, so as to realize the connection with the energized first-column electrical panel 1 and the re-power supply, meeting their power consumption requirements.

[0033] It should be noted that through the downstream double-switch 13 wired in this way, when the two columns of electrical panels undergoing parallel maintenance among the first-column electrical panel 1, the second-column electrical panel and the third-column electrical panel change, for example, the first-column electrical panel 1 and the third-column electrical panel are the two columns of electrical panels undergoing parallel maintenance, without changing the circuit wiring of the tapping box 5, it is also possible to supply power with the second-column distribution board 20 on the energized second-column electrical panel as the input terminal of the tapping box 5, and supply power to the first-column distribution board 10 of the first-column electrical panel 1 and the third-column distribution board 30 of the third-column electrical panel connected to the output terminal, meeting the power consumption requirements of the electrical equipment 4 thereon.

[0034] In one embodiment, the output terminals of the tapping box 5 are respectively connected to two downstream double-switches 13 of two second-column distribution boards 20 and two downstream double-switches 13 of two third-column electrical panels.

[0035] Specifically, a large number of electrical equipment 4 are connected to each column of electrical panels of the nuclear power unit, and the electrical equipment 4 are respectively connected to different-column distribution boards of each column of electrical panels. At the same time, in the overhaul condition, among the electrical equipment 4, there are network-related cabinets that need to maintain power supply, and there are also plant ventilation equipment that does not need to maintain power supply. Similarly, according to the civil engineering conditions of the corresponding facilities of each column of electrical panels, the distribution boards of each column of electrical equipment 4 that need to maintain power supply are directly connected to the tapping box 5 to meet the power supply requirements. That is to say, the two second-column distribution boards 20 and the two third-column distribution boards 30 respectively connected to the output terminal of the tapping box 5 are for illustration, and they can represent multiple distribution boards of each column connected.

[0036] The present utility model also provides a power supply device for the electrical panel of a nuclear power unit, and the power supply device adopts the above-mentioned power supply circuit. In this way, it can meet the power supply requirements of the electrical equipment 4 on each column of electrical panels under the condition of parallel maintenance of two columns of electrical panels during the overhaul of the nuclear power unit.

[0037] In summary, a power supply circuit and a power supply device for an electrical panel of a nuclear power unit provided by the present utility model utilize a row of energized electrical panels as the power source for the electrical equipment on two rows of electrical panels in the shutdown and maintenance state, meeting the power supply requirements of the electrical equipment when two rows of electrical panels are overhauled in parallel under the overhaul condition. The connection between the first row of electrical panels and the electrical equipment on the second row of electrical panels and the third row of electrical panels is realized through a tapping box, meeting the power supply requirements of the electrical equipment on the second row of electrical panels and the third row of electrical panels in the parallel overhaul state.

[0038] The above embodiments are only illustrative of the principles and effects of the present utility model and are not intended to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A power supply circuit for an electrical panel of a nuclear power unit, characterized in that: include: The first row of electrical panels (1), the second row of electrical panels and the third row of electrical panels are respectively connected with electrical equipment (4); A branch box (5), wherein the input end of the branch box (5) is connected to the output end of the first row of electrical panels (1), and the output end of the branch box (5) is connected to the input end of the electrical equipment (4) on the second row of electrical panels and the third row of electrical panels.

2. The power supply circuit according to claim 1, characterized in that: The first row of electrical panels (1) further comprises a first row of distribution bars (10) connected to the output end thereof, and the input end of the junction box (5) is connected to the output end of the first row of distribution bars (10).

3. The power supply circuit according to claim 2, characterized in that: A repower supply interface (11) is also provided on the line between the first row of electrical panels (1) and the first row of distribution bars (10), and the repower supply interface (11) is connected to a repower supply electrical panel (6).

4. The power supply circuit according to claim 1, characterized in that: The output end of the junction box (5) is respectively connected to the two electrical devices (4) of the second row of electrical panels and the two electrical devices (4) of the third row of electrical panels.

5. The power supply circuit according to claim 3, characterized in that: The first row of electrical panels (1) and the first row of distribution bars (10) are connected by an upstream double-cut switch (12), and the branch box (5) and the electrical equipment (4) are connected by a downstream double-cut switch (13).

6. The power supply circuit according to claim 5, characterized in that: The input end of the upstream double cut switch (12) is connected to the output end of the first column electrical panel (1) or the re-supply electrical panel (6), and the output end of the upstream double cut switch (12) is connected to the first column distribution bar (10).

7. The power supply circuit according to claim 5, characterized in that: The input end of the downstream double cut switch (13) is connected to the output end of the junction box (5) and the second row distribution bar (20) of the second row electrical panel or the third row distribution bar (30) of the third row electrical panel, and the output end of the downstream double cut switch (13) is connected to the electrical equipment (4).

8. The power supply circuit according to any one of claims 3 or 5-7, characterized in that: The first row of electrical panels (1) and the repowering electrical panel (6) are direct current power sources.

9. The power supply circuit according to any one of claims 1 to 7, characterized in that: The electrical equipment (4) is a network-related cabinet.

10. A power supply device for an electrical panel of a nuclear power unit, characterized in that: The power supply device adopts the power supply circuit as described in any one of claims 1-9.

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