Power distribution device and maintenance system applied to power supply after overhaul of nuclear power unit

Abstract

The utility model provides a power distribution device and a maintenance system applied to power supply after overhaul of a nuclear power unit, and relates to the technical field of nuclear power operation, the power distribution device applied to power supply after overhaul of the nuclear power unit comprises an upstream switchboard unit; the first input ends of the two columns of parallel maintenance switchboards are electrically connected with the output end of the upstream switchboard unit; and the input end of the re-power supply panel unit is electrically connected with the output ends of the two columns of parallel maintenance switchboards, so that the re-power supply panel unit is re-powered through the two columns of parallel maintenance switchboards. According to the utility model, the implementation difficulty of re-power supply is greatly reduced through a mode of carrying out electrical connection on the newly added electrical panel cabinets of the two columns of parallel maintenance switchboards through the newly added standby intervals.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power operation, in particular to a power distribution device and a maintenance system used for overhaul and repowering of nuclear power units. Background Art

[0002] During the overhaul of nuclear power units, the switchboards are occupied, making it impossible to conveniently re-power the emergency equipment during maintenance for the switchboards of the corresponding columns, which increases the difficulty of implementing re-powering during the overhaul. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a distribution device and a maintenance system for overhaul and repowering of nuclear power units, which is used to solve the problem in the prior art that when a nuclear power unit is overhauled, it is impossible to conveniently provide repowering of emergency equipment for maintenance for the corresponding column of distribution boards, which increases the difficulty of implementing repowering during the overhaul.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a distribution device for overhaul and re-powering of nuclear power units, including: an upstream distribution panel unit; two rows of parallel maintenance distribution panels, the first input end of the two rows of parallel maintenance distribution panels being electrically connected to the output end of the upstream distribution panel unit; and a re-power panel unit, the input end of the re-power panel unit being electrically connected to the output end of the two rows of parallel maintenance distribution panels, so as to re-power the re-power panel unit through the two rows of parallel maintenance distribution panels.

[0005] In one embodiment of the utility model, the upstream distribution board unit includes: an upstream distribution board, a distribution main line, and a branch line. The upstream distribution board is electrically connected to the first end of the distribution main line, and the first ends of several branch lines are respectively electrically connected to the second ends of the distribution main line, and the second ends of the branch lines are respectively electrically connected to the corresponding two rows of parallel maintenance distribution boards.

[0006] In one embodiment of the present invention, the upstream switchboard is a LKZ (AA plant low voltage AC power supply 380V system) switchboard.

[0007] In one embodiment of the present invention, the second input ends of the two parallel maintenance switchboards are respectively connected to the corresponding nuclear island auxiliary switchboards.

[0008] In one embodiment of the utility model, two rows of parallel maintenance distribution boards include: LKD (electrical plant / BA building low-voltage AC power supply 380V system) distribution board, LKH (pump room 380V AC power supply system) distribution board, LKG (conventional island auxiliary equipment low-voltage AC power supply 380V system) distribution board and DEL (electrical plant chilled water system) distribution board, and the first input end of the LKD distribution board, the first input end of the LKH distribution board, the first input end of the LKG distribution board and the first input end of the DEL distribution board are electrically connected to the output end of the upstream distribution board unit respectively.

[0009] In one embodiment of the utility model, the nuclear island auxiliary distribution board includes: LKA (conventional island auxiliary equipment low-voltage AC power supply 380V system) distribution board, LKC (conventional island auxiliary equipment low-voltage AC power supply 380V system) distribution board, LKB (conventional island auxiliary equipment low-voltage AC power supply 380V system) distribution board and LMH (220V AC power distribution system) distribution board, the second input end of the LKD distribution board is electrically connected to the LKA distribution board, the second input end of the LKH distribution board is electrically connected to the LKC distribution board, the second input end of the LKG distribution board is electrically connected to the LKB distribution board, and the second input end of the DEL distribution board is electrically connected to the LMH distribution board.

[0010] In one embodiment of the utility model, two rows of parallel maintenance switchboards include a plurality of spare drawers, and the input end of the switchboard unit is connected to the spare drawer.

[0011] In one embodiment of the present invention, the emergency equipment switchboards corresponding to the adjacent two rows of parallel maintenance switchboards without spare drawers are connected to the spare drawers of the two rows of parallel maintenance switchboards with spare drawers.

[0012] In one embodiment of the present invention, two parallel maintenance switchboards include a plurality of spare drawers, which are arranged on the LKH switchboard and the LKG switchboard, and the emergency equipment switchboard corresponding to the LKA switchboard is connected to the spare drawer of the LKH switchboard.

[0013] The utility model also provides a maintenance system, comprising the above-mentioned power distribution device used for overhaul and re-powering of nuclear power units.

[0014] Beneficial effects of the utility model: The utility model proposes a power distribution device and maintenance system for overhaul and repowering of nuclear power units. The power distribution device and maintenance system can realize simultaneous overhaul of two rows of electrical panels by supplying power to two rows of parallel maintenance switchboards through an upstream switchboard unit. At the same time, by adding equipment drawers to the two rows of parallel maintenance switchboards with relatively small loads, the spare drawers can be electrically connected to the corresponding repowering switchboard units to realize repowering of the emergency equipment corresponding to the two rows of parallel maintenance switchboards in the same row. Similarly, repowering can also be provided for the emergency equipment corresponding to the two adjacent rows of parallel maintenance switchboards with relatively large loads, greatly reducing the difficulty of implementing repowering. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the power distribution device of the utility model.

[0016] Figure 2 Shown is a schematic structural diagram of a power distribution device in a preferred embodiment of the utility model.

[0017] Component number description

[0018] Upstream switchboard unit 1; two parallel maintenance switchboards 2; resupply switchboard unit 3; nuclear island auxiliary switchboard 4; distribution line 5; upstream switchboard 11; main distribution line 12; and branch line 13; first input terminal 21; second input terminal 22; LKD switchboard 23; LKH switchboard 24; LKG switchboard 25; DEL switchboard 26; spare drawer 27; emergency equipment switchboard 28; LKA switchboard 41, LKC switchboard 42, LKB switchboard 43 and LMH switchboard 44. DETAILED DESCRIPTION

[0019] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0021] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0022] See also Figure 1 The utility model provides a power distribution device for overhaul and re-powering of a nuclear power unit, comprising: an upstream switchboard unit 1; two parallel maintenance switchboards 2, wherein the first input terminals 21 of the two parallel maintenance switchboards 2 are electrically connected to the output terminals of the upstream switchboard unit 1; and a re-powering switchboard unit 3, wherein the input terminals of the re-powering switchboard unit 3 are electrically connected to the output terminals of the two parallel maintenance switchboards 2, so as to re-power the re-powering switchboard unit 3 through the two parallel maintenance switchboards 2.

[0023] It is not difficult to find from the above content that in the process of re-powering and distributing power during the overhaul of the nuclear power unit, the upstream switchboard unit 1 can realize the power supply to the two parallel maintenance switchboards 2, so as to realize the re-powering of the two parallel maintenance switchboards during the overhaul. At the same time, when the upstream switchboard unit 1 re-powers the two parallel maintenance switchboards 2, the two parallel maintenance switchboards 2 further realize the power supply to the re-powering switchboard unit 3, so as to realize the re-powering of the relevant emergency equipment of the two parallel maintenance switchboards 2 of each column through the re-powering switchboard unit 3. Thereby reducing the difficulty of re-powering the emergency equipment during the overhaul.

[0024] It is worth noting that during the overhaul period, since some two-column parallel maintenance switchboards 2 bear a relatively large load when re-powering, a re-powering switchboard unit 3 can be added to other adjacent or non-adjacent two-column parallel maintenance switchboards 2 with relatively small loads to provide re-power for the emergency equipment of the two-column parallel maintenance switchboards 2 in the column. At the same time, it can also provide re-power for the emergency equipment of other two-column parallel maintenance switchboards 2 with larger loads. The above method can effectively reduce the difficulty of re-powering during overhaul. Specifically, the re-powering switchboard unit 3 includes a re-powering switchboard corresponding to the two-column parallel maintenance switchboard 2 in each column.

[0025] like Figure 1 As shown, the upstream distribution board unit 1 includes: an upstream distribution board 11, a main distribution line 12, and a branch line 13. The upstream distribution board 11 is electrically connected to the first end of the main distribution line 12, and the first ends of several branch lines 13 are respectively electrically connected to the second ends of the main distribution line 12, and the second ends of the branch lines 13 are respectively electrically connected to the corresponding two columns of parallel maintenance distribution boards 2.

[0026] In one embodiment of the utility model, when the upstream switchboard unit 1 is used as a power supply to provide power to two parallel maintenance switchboards 2 respectively, the upstream switchboard 11 is used as a power input power source. The power is transmitted to the branch line 13 corresponding to each of the two parallel maintenance switchboards 2 through the power distribution main line 12, and finally the two parallel maintenance switchboards 2 are powered, thereby ensuring the repowering of the two parallel maintenance switchboards 2 during the overhaul. Moreover, the power supply of the upstream switchboard 11 to the two parallel maintenance switchboards 2 can also realize the further repowering of the repowering switchboard unit 3.

[0027] Preferably, the upstream switchboard 11 is an LKZ switchboard. In this embodiment, when the upstream switchboard 11 is used to provide power to the two parallel maintenance switchboards 2, the upstream switchboard 11 can be powered by the 9LGI switchboard (public and plant area 6.6KV switchboard system) to the 1LKZ switchboard (AA plant low voltage AC power supply 380V system), and then the 1LKZ switchboard further supplies power to the two parallel maintenance switchboards 2 through the distribution main line 12.

[0028] Furthermore, the second input terminals 22 of the two parallel maintenance switchboards 2 are respectively connected to the corresponding nuclear island auxiliary switchboards 4. In this embodiment, under normal working conditions, the power on the two parallel maintenance switchboards 2 is provided by the original nuclear island auxiliary switchboard 4.

[0029] Specifically, the two parallel maintenance distribution boards 2 include: LKD distribution board 23, LKH distribution board 24, LKG distribution board 25 and DEL distribution board 26, and the first input end 21 of LKD distribution board 23, the first input end 21 of LKH distribution board 24, the first input end 21 of LKG distribution board 25 and the first input end 21 of DEL distribution board 26 are electrically connected to the output end of the upstream distribution board unit 1 respectively.

[0030] In one embodiment of the utility model, during the parallel maintenance of two columns, the parallel maintenance switchboards 2 of the two columns include LKD switchboard 23, LKH switchboard 24, LKG switchboard 25 and DEL switchboard 26. Moreover, the first input end 21 of LKD switchboard 23, the first input end 21 of LKH switchboard 24, the first input end 21 of LKG switchboard 25 and the first input end 21 of DEL switchboard 26 are also electrically connected to the output end of the upstream switchboard unit 1, so as to realize the re-powering of LKD switchboard 23, LKH switchboard 24, LKG switchboard 25 and DEL switchboard 26 during maintenance through the upstream switchboard unit 1. Moreover, when not in maintenance, the second input end 22 of LKH switchboard 24, the second input end 22 of LKG switchboard 25 and the second input end 22 of DEL switchboard 26 are also respectively powered through the auxiliary switchboard 4 of the nuclear island.

[0031] Preferably, the nuclear island auxiliary distribution board 4 includes: an LKA distribution board 41, an LKC distribution board 42, an LKB distribution board 43 and an LMH distribution board 44, the second input end 22 of the LKD distribution board 23 is electrically connected to the LKA distribution board 41, the second input end 22 of the LKH distribution board 24 is electrically connected to the LKC distribution board 42, the second input end 22 of the LKG distribution board 25 is electrically connected to the LKB distribution board 43, and the second input end 22 of the DEL distribution board 26 is electrically connected to the LMH distribution board 44.

[0032] In one embodiment of the utility model, when the LKD distribution board 23, the LKH distribution board 24, the LKG distribution board 25 and the DEL distribution board 26 are respectively powered by the nuclear island auxiliary distribution board 4, the LKA distribution board 41 can be powered by the LKD distribution board 23; the LKC distribution board 42 can be powered by the LKH distribution board 24; the LKB distribution board 43 can be powered by the LKG distribution board 25; and the LMH distribution board 44 can be powered by the DEL distribution board 26.

[0033] Furthermore, the two parallel maintenance switchboards 2 include a plurality of spare drawers 27, and the input end of the re-supply switchboard unit 3 is connected to the spare drawer 27. In this embodiment, when re-supplying power through the two parallel maintenance switchboards 2, by adding a spare drawer 27 to the two parallel maintenance switchboards 2, the re-supply switchboard unit 3 can be further re-supplyed through the two parallel maintenance switchboards 2.

[0034] Specifically, the emergency equipment switchboards 28 corresponding to the adjacent two-column parallel maintenance switchboards 2 without spare drawers 27 are connected to the spare drawers 27 of the two-column parallel maintenance switchboards 2 with spare drawers 27. In other words, when there are emergency equipment in the two-column parallel maintenance switchboards 2 without spare drawers 27 that need to be re-powered, the corresponding emergency equipment can be connected to the corresponding spare drawers 27 of the two-column parallel maintenance switchboards 2 with spare drawers 27 to reduce the operating load of the two-column parallel maintenance switchboards 2 without spare drawers 27.

[0035] Preferably, the two parallel maintenance switchboards 2 include a plurality of spare drawers 27 , which are arranged on the LKH switchboard 24 and the LKG switchboard 25 , and the emergency equipment switchboard 28 corresponding to the LKA switchboard 41 is connected to the spare drawer 27 of the LKH switchboard 24 .

[0036] In one embodiment of the utility model, in the two parallel maintenance switchboards 2 composed of the LKD switchboard 23, the LKH switchboard 24, the LKG switchboard 25 and the DEL switchboard 26, the LKD switchboard 23 can only be re-powered through the spare interval. However, there are fewer spare intervals on the LKD switchboard 23. In order to further reduce the pressure on the spare intervals, the load on the LKD switchboard 23 can be optimized and transferred to the spare drawer 27 of the LKH switchboard 24, which can effectively reduce the difficulty of re-powering. Moreover, the LKD switchboard 23 does not have spare cable holes and embedded parts, so it is impossible to increase the cabinet. The LKG switchboard 25 can increase 3 cabinets, and the LKH switchboard 24 can increase 1 cabinet.

[0037] See also Figure 2 In a preferred embodiment, the LLA1 distribution panel supplies power to the LLD2 distribution panel, i.e., two columns of parallel maintenance distribution panel 2; the LLC1 distribution panel, LLI1 (column B) distribution panel, and LLF1 (column A) distribution panel supply power to the LLJ2 distribution panel, i.e., two columns of parallel maintenance distribution panel 2; and the LLB1 supplies power to the LLG2, i.e., two columns of parallel maintenance distribution panel 2. A repowering panel unit 3 is added to the LLJ2 distribution panel to realize repowering of the emergency equipment in this column. The LLG2 distribution panel realizes repowering of the emergency equipment in this column by adding a repowering panel unit 3. At the same time, the LLG2 distribution panel is also electrically connected to the LLD2 distribution panel through the distribution line 5 to realize repowering of the LLD2 distribution panel, and further, a repowering panel unit 3 is added to the LLD2 distribution panel to realize repowering of the emergency equipment in this column.

[0038] The utility model also provides a maintenance system, comprising the above-mentioned power distribution device used for overhaul and re-powering of nuclear power units.

[0039] In summary, the utility model provides power to two parallel maintenance switchboards 2 by the upstream switchboard unit 1 to achieve simultaneous maintenance of two rows of electrical panels. At the same time, by adding equipment drawers 27 to the two parallel maintenance switchboards 2 with relatively small loads, the spare drawers 27 can be electrically connected to the corresponding re-supply switchboard unit 3 to achieve re-supply of emergency equipment corresponding to the two parallel maintenance switchboards 2 in this row. Similarly, re-supply can also be provided for emergency equipment corresponding to two adjacent parallel maintenance switchboards 2 with relatively large loads, greatly reducing the difficulty of implementing re-supply. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0040] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A power distribution device used for overhaul and repowering of nuclear power units, characterized in that: include: upstream switchboard unit (1); Two parallel maintenance switchboards (2), wherein the first input terminals (21) of the two parallel maintenance switchboards (2) are electrically connected to the output terminals of the upstream switchboard unit (1); as well as A re-supply panel unit (3) is provided, wherein the input end of the re-supply panel unit (3) is electrically connected to the output end of the two parallel maintenance switchboards (2), so as to re-supply the re-supply panel unit (3) through the two parallel maintenance switchboards (2).

2. The power distribution device for overhaul and repowering of nuclear power units according to claim 1 is characterized in that: The upstream distribution panel unit (1) comprises: an upstream distribution panel (11), a main distribution line (12), and a branch line (13); the upstream distribution panel (11) is electrically connected to a first end of the main distribution line (12); the first ends of a plurality of branch lines (13) are respectively electrically connected to a second end of the main distribution line (12); and the second ends of the branch lines (13) are respectively electrically connected to the corresponding two rows of parallel maintenance distribution panels (2).

3. The power distribution device for overhaul and repowering of nuclear power units according to claim 2 is characterized in that: The upstream switchboard (11) is an LKZ switchboard.

4. The power distribution device for overhaul and repowering of nuclear power units according to claim 1 is characterized in that: The second input ends (22) of the two parallel maintenance switchboards (2) are respectively connected to corresponding nuclear island auxiliary switchboards (4).

5. The power distribution device for overhaul and repowering of nuclear power units according to claim 4 is characterized in that: The two parallel maintenance switchboards (2) comprise: an LKD switchboard (23), an LKH switchboard (24), an LKG switchboard (25) and a DEL switchboard (26); the first input end (21) of the LKD switchboard (23), the first input end (21) of the LKH switchboard (24), the first input end (21) of the LKG switchboard (25) and the first input end (21) of the DEL switchboard (26) are respectively electrically connected to the output end of the upstream switchboard unit (1).

6. The power distribution device for overhaul and repowering of nuclear power units according to claim 5 is characterized in that: The nuclear island auxiliary switchboard (4) comprises: an LKA switchboard (41), an LKC switchboard (42), an LKB switchboard (43) and an LMH switchboard (44); the second input end (22) of the LKD switchboard (23) is electrically connected to the LKA switchboard (41); the second input end (22) of the LKH switchboard (24) is electrically connected to the LKC switchboard (42); the second input end (22) of the LKG switchboard (25) is electrically connected to the LKB switchboard (43); and the second input end (22) of the DEL switchboard (26) is electrically connected to the LMH switchboard (44).

7. The power distribution device for overhaul and repowering of nuclear power units according to claim 1 is characterized in that: The two parallel maintenance switchboards (2) include a plurality of spare drawers (27), and the input end of the re-supply switchboard unit (3) is connected to the spare drawer (27).

8. The power distribution device for overhaul and repowering of nuclear power units according to claim 7 is characterized in that: The emergency equipment switchboards (28) corresponding to the two adjacent parallel maintenance switchboards (2) without the spare drawers (27) are connected to the spare drawers (27) of the two adjacent parallel maintenance switchboards (2) with the spare drawers (27).

9. The power distribution device for overhaul and repowering of nuclear power units according to claim 6, characterized in that: The two parallel maintenance switchboards (2) include a plurality of spare drawers (27), the spare drawers (27) being arranged on the LKH switchboard (24) and the LKG switchboard (25), and the emergency equipment switchboard (28) corresponding to the LKA switchboard (41) being connected to the spare drawer (27) of the LKH switchboard (24).

10. A maintenance system, characterized in that: It comprises the power distribution device for overhaul and re-powering of nuclear power units as described in any one of claims 1-9.

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