Emergency safety power supply circuit and system for nuclear power plant

Abstract

The utility model relates to the technical field of nuclear power plant emergency power supply, and discloses a nuclear power plant emergency safety power supply circuit and system, and the circuit comprises a first emergency generator set which comprises two first emergency buses; the second emergency generator set comprises two second emergency buses; the switching unit comprises a first input end, a second input end and four output ends, two output ends are respectively connected with the two first emergency buses, and the other two output ends are respectively connected with the two second emergency buses; the switching unit is used for controlling the first input end to be connected with an output end and / or controlling the second input end to be connected with the output end; a first switching unit; the first power generation unit is connected to the first input end through the first switch unit so as to provide an emergency power supply; a second switching unit; and the second power generation unit is connected to the second input end through the second switch unit so as to provide an emergency power supply. According to the utility model, the emergency generator set can be overhauled during the operation period of the generator set.

Description

Technical Field

[0001] The utility model relates to the technical field of emergency power supply for nuclear power plants, in particular to an emergency safety power supply circuit and system for nuclear power plants. Background Art

[0002] The original safety power supply system of the nuclear power plant includes off-site power supply and in-plant power supply system. The in-plant power supply is mainly supplied by two emergency generator sets. Each emergency generator set carries different safety loads. During the operation of the nuclear power plant unit (referred to as the unit), according to the nuclear safety operation and maintenance supervision requirements, the emergency power supply system composed of the existing emergency generator sets must be required to remain available. Once the failure is unavailable for more than a certain period of time, the power plant unit will begin to withdraw power. Since the emergency generator set must remain available during the operation of the unit, the operation and maintenance of the emergency generator set can only be arranged during the unit refueling overhaul. However, the maintenance work of the emergency generator set during the refueling overhaul is complicated and the maintenance time is limited. In a certain nuclear power plant, it has happened many times that the maintenance of the emergency generator set affected the refueling overhaul period, causing significant economic losses to the nuclear power plant. Utility Model Content

[0003] The technical problem to be solved by the utility model is that, in view of the problem that the existing nuclear power plant emergency safety power supply system cannot be repaired during the operation of the nuclear power plant units, a nuclear power plant emergency safety power supply circuit and system are provided.

[0004] The technical solution adopted by the utility model to solve the technical problem is: constructing a nuclear power plant emergency safety power supply circuit, including:

[0005] A first emergency generator set, comprising two first emergency busbars;

[0006] A second emergency generator set, comprising two second emergency busbars;

[0007] A switching unit, comprising a first input end, a second input end and four output ends, two of the four output ends are respectively connected to the two first emergency busbars, and the other two output ends are respectively connected to the two second emergency busbars; the switching unit is used to control the first input end to be connected to one of the four output ends and / or control the second input end to be connected to one of the four output ends;

[0008] a first switch unit;

[0009] a first power generation unit, connected to the first input terminal via the first switch unit, for providing emergency power;

[0010] a second switching unit; and

[0011] The second power generation unit is connected to the second input terminal via the second switch unit, and is used to provide emergency power.

[0012] Preferably, the switching unit comprises:

[0013] A first sub-switching unit, comprising a first sub-input terminal and four first sub-output terminals, and configured to connect the first sub-input terminal to one of the four first sub-output terminals according to an operation;

[0014] A second sub-switching unit, comprising a second sub-input terminal and four second sub-output terminals, and configured to connect the second sub-input terminal to one of the four second sub-output terminals according to an operation;

[0015] The first sub-input end is connected to the first power generation unit via the first switch unit, the second sub-input end corresponds to the second input end, two of the four first sub-output ends are respectively connected to the two first emergency busbars, and the other two first sub-output ends are respectively connected to the two second emergency busbars;

[0016] Two of the four second sub-output terminals are connected to two second emergency busbars respectively, and the other two second sub-output terminals are connected to two first emergency busbars respectively.

[0017] Preferably, the first sub-switching unit includes:

[0018] Four first switch bays, wherein the first ends of two of the four first switch bays are respectively connected to the two first emergency busbars, the first ends of the other two first switch bays are respectively connected to the two second emergency busbars, and the node after the second end of each first switch bay is connected is connected to the first power generation unit via the first switch unit; and

[0019] A first closing mechanism, used for controlling one of the four first switch intervals to close according to operation;

[0020] The second sub-switching unit comprises:

[0021] Four second switch bays, wherein the first ends of two of the four second switch bays are respectively connected to the two second emergency busbars, the first ends of the other two second switch bays are respectively connected to the two first emergency busbars, and the node after the second end of each second switch bay is connected is connected to the second power generation unit via the second switch unit; and

[0022] The second closing mechanism is used for controlling one of the four second switch intervals to close according to operation.

[0023] Preferably, each of the first switch bays and each of the second switch bays is a medium-voltage switch cabinet; and the first closing mechanism and the second closing mechanism are both isolating trolleys capable of controlling the medium-voltage switch cabinet to be turned on or off.

[0024] Preferably, the first power generation unit and the second power generation unit are both diesel generators.

[0025] Preferably, the first emergency generator set further comprises a third switch unit, a fourth switch unit, a first emergency generator EDG1, a second emergency generator EDG2, and two fifth switch units;

[0026] The first emergency generator EDG1 is connected to one of the two first emergency busbars via the third switch unit, and the second emergency generator EDG2 is connected to the other first emergency busbar via the fourth switch unit. The two first emergency busbars are also respectively connected to the second ends of the two fifth switch units, and the first ends of the two fifth switch units are respectively used to output emergency power supplies;

[0027] The second emergency generator set further includes a sixth switch unit, a seventh switch unit, a third emergency generator EDG3, a fourth emergency generator EDG4, and two eighth switch units;

[0028] The third emergency generator EDG3 is connected to one of the two second emergency busbars via the sixth switch unit, and the fourth emergency generator EDG4 is connected to the other second emergency busbar via the seventh switch unit. The two second emergency busbars are also respectively connected to the second ends of the two eighth switch units, and the first ends of the two eighth switch units are respectively used to output emergency power supplies.

[0029] Preferably, the nuclear power plant emergency safety power supply circuit further includes four emergency bus switch units;

[0030] Each of the emergency bus switch units is respectively connected in series between each of the output ends and two of the first emergency bus bars and two of the second emergency bus bars.

[0031] Preferably, the first switch unit, the second switch unit and each of the emergency bus switch units include a circuit breaker respectively.

[0032] Preferably, the nuclear power plant emergency safety power supply circuit also includes:

[0033] A first input control switch connected between the first input terminal and the first switch unit; and

[0034] The second input control switch is connected between the second input terminal and the second switch unit.

[0035] The utility model also constructs a nuclear power plant emergency safety power supply system, which comprises the nuclear power plant emergency safety power supply circuit described above.

[0036] The implementation of the utility model has the following beneficial effects: the first power generation unit and the second power generation unit can temporarily replace the functions of the corresponding emergency power generation set, so that the emergency power generation set can be overhauled during the operation of the nuclear power plant unit, which improves the flexibility of the overhaul of the emergency power generation set and significantly improves the operating stability and economic benefits of the nuclear power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0038] Figure 1 It is a circuit schematic diagram of a nuclear power plant emergency safety power supply circuit in some embodiments of the utility model;

[0039] Figure 2 It is a structural schematic diagram of a nuclear power plant emergency safety power supply system in some embodiments of the utility model. DETAILED DESCRIPTION

[0040] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0041] The utility model provides a nuclear power plant emergency safety power supply circuit, such as Figure 1 As shown, the emergency safety power supply circuit of the nuclear power plant includes a first emergency generator set 10, a second emergency generator set 20, a switching unit 1, a first switch unit 2, a first power generation unit 3, a second switch unit 4 and a second power generation unit 5.

[0042] See also Figure 1 The first emergency generator set 10 includes two first emergency busbars 30. Specifically, when an abnormality occurs in the external power supply of the nuclear power plant unit, the first emergency generator set 10 will work to provide two emergency power supplies to the nuclear power plant unit through the two first emergency busbars 30 respectively.

[0043] Furthermore, if Figure 1 As shown, the first emergency generator set 10 may further include a third switch unit 51 , a fourth switch unit 61 , a first emergency generator EDG1 , a second emergency generator EDG2 , and two fifth switch units 71 .

[0044] Specifically, the first emergency generator EDG1 is connected to one of the two first emergency busbars 30 via the third switch unit 51, and the second emergency generator EDG2 is connected to the other first emergency busbar 30 via the fourth switch unit 61. The two first emergency busbars 30 are also respectively connected to the second ends of the two fifth switch units 71, and the first ends of the two fifth switch units 71 are respectively used to output emergency power supplies.

[0045] It can be understood that when the first emergency generator EDG1 is started and the third switch unit 51 and the fifth switch unit 71 on the first emergency bus 30 connected to the third switch unit 51 are closed at the same time, the output power of the first emergency generator EDG1 will be input to the nuclear power unit through the first end of the fifth switch unit 71 to serve as an emergency power supply; similarly, when the first emergency generator EDG1 is started and the fourth switch unit 61 and another fifth switch unit 71 are closed at the same time, the output of the second emergency generator EDG2 will be input to the nuclear power unit through the other fifth switch unit 71 to serve as another emergency power supply.

[0046] See also Figure 1 The second emergency generator set 20 includes two second emergency busbars 40. Specifically, when an abnormality occurs to the external power supply of the nuclear power plant unit, the second emergency generator set 20 will work to provide two emergency power supplies to the nuclear power plant unit through the two second emergency busbars 40 respectively.

[0047] Furthermore, if Figure 1 As shown, the second emergency generator set 20 may further include a sixth switch unit 52 , a seventh switch unit 62 , a third emergency generator EDG3 , a fourth emergency generator EDG4 , and two eighth switch units 72 .

[0048] Specifically, the third emergency generator EDG3 is connected to one of the two second emergency busbars 40 via the sixth switch unit 52, and the fourth emergency generator EDG4 is connected to the other second emergency busbar 40 via the seventh switch unit 62. The two second emergency busbars 40 are also respectively connected to the second ends of the two eighth switch units 72, and the first ends of the two eighth switch units 72 are respectively used to output emergency power supplies.

[0049] It should be understood that the working principle of the second emergency generator set 20 is the same as that of the first emergency generator set 10, which will not be described in detail here.

[0050] Optionally, the first emergency generator EDG1, the second emergency generator EDG2, the third emergency generator EDG3 and the fourth emergency generator EDG4 are all existing diesel generators.

[0051] It should be noted that when an abnormality occurs in the external power supply of a nuclear power plant unit, the corresponding emergency generator set (including the first emergency generator set 10 and the second emergency generator set 20) is activated first to prevent the nuclear power plant unit from losing power.

[0052] The switching unit 1 includes a first input end, a second input end, and four output ends, two of the four output ends are respectively connected to two first emergency busbars 30, and the other two output ends are respectively connected to two second emergency busbars 40. The switching unit 1 is used to control the first input end to be connected to one of the four output ends and / or control the second input end to be connected to one of the four output ends.

[0053] In some embodiments, Figure 1 As shown, the switching unit 1 includes a first sub-switching unit 11 and a second sub-switching unit 12 .

[0054] The first sub-switching unit 11 includes a first sub-input terminal and four first sub-output terminals, and the first sub-switching unit 11 is used to connect the first sub-input terminal with one of the four first sub-output terminals according to an operation. Moreover, the second sub-switching unit 12 includes a second sub-input terminal and four second sub-output terminals, and the second sub-switching unit 12 is used to connect the second sub-input terminal with one of the four second sub-output terminals according to an operation.

[0055] Specifically, the first sub-input end of the first sub-switching unit is connected to the first generating unit 3 (i.e., serving as the first input end of the switching unit 1) via the first switch unit 2, the second sub-input end of the second sub-switching unit 12 is connected to the second generating unit 5 (i.e., serving as the second input end of the switching unit 1) via the second switch unit 4, two first sub-output ends of the four first sub-output ends (respectively serving as the two output ends) are respectively connected to the two first emergency busbars 30, and the other two first sub-output ends are respectively connected to the two second emergency busbars 40; two second sub-output ends of the four first sub-output ends (respectively serving as the other two output ends) are respectively connected to the two second emergency busbars 40, and the other two second sub-output ends are respectively connected to the two first emergency busbars 30.

[0056] In some embodiments, Figure 1 As shown, the first sub-switching unit 11 includes a first closing mechanism 112 and four first switch intervals 111 .

[0057] Specifically, the first closing mechanism 112 is used to control the closing of one of the two first switch intervals 111 according to the operation of the staff; the first ends of two of the four first switch intervals 111 are respectively connected to the two first emergency busbars 30, and the first ends of the other two first switch intervals 111 are respectively connected to the two second emergency busbars 40, and the node after the second end of each first switch interval 111 is connected (as the first sub-input end of the first sub-switching unit 11) is connected to the first power generation unit 3 via the first switch unit 2.

[0058] In some embodiments, Figure 1 As shown, the second sub-switching unit 12 includes a second closing mechanism 122 and four second switch intervals 121 .

[0059] Specifically, the second closing mechanism 122 is used to control the closing of one of the four second switch intervals 121 according to operation; the first ends of two of the four second switch intervals 121 are respectively connected to the two second emergency busbars 40, and the first ends of the other two second switch intervals 121 are respectively connected to the two first emergency busbars 30, and the node after the second end of each second switch interval 121 is connected (as the second sub-input end of the second sub-switching unit 12) is connected to the second power generation unit 5 via the second switch unit 4.

[0060] In some embodiments, each first switch compartment 111 and each second switch compartment 121 are medium-voltage switch cabinets, and the first closing mechanism 112 and the second closing mechanism 122 are isolation trolleys that can control the medium-voltage switch cabinet to be turned on or off. In this embodiment, the isolation trolley and each medium-voltage switch cabinet can be existing or customized switchgear that can match each other. The staff can control the medium-voltage switch cabinet to be turned on by pushing the isolation trolley into a certain medium-voltage switch cabinet, and control the medium-voltage switch cabinet to be turned off by pushing the isolation trolley out of the medium-voltage switch cabinet.

[0061] The first switch unit 2 and the second switch unit 4 are respectively used to control the on and off of the lines. Further, the first switch unit 2 and the second switch unit 4 may respectively include existing circuit breakers, and the control mode of the first switch unit 2 and the second switch unit 4 may be manual control or electronic control through an existing circuit breaker control circuit, which is not limited here.

[0062] The first power generation unit 3 is connected to the first input terminal via the first switch unit 2, and the first power generation unit 3 is used to provide emergency power during operation.

[0063] The second power generation unit 5 is connected to the second input terminal via the second switch unit 4, and the second power generation unit 5 is used to provide emergency power during operation.

[0064] Optionally, the first power generation unit 3 and the second power generation unit 5 are diesel generators respectively.

[0065] In some embodiments, Figure 1 As shown, the nuclear power plant emergency safety power supply circuit further includes four emergency bus switch units 6. Each emergency bus switch unit 6 may include a circuit breaker.

[0066] Specifically, each emergency bus switch unit 6 is connected in series between each output end and two first emergency buses 30 and two second emergency buses 40 .

[0067] In this embodiment, each emergency bus switch unit 6 is used to control whether the corresponding output terminal is connected to the emergency bus, so that the emergency bus and the relevant output terminals can be completely isolated, so that when the first emergency generator set 10 or the second emergency generator set 20 is being repaired, it can prevent the staff from mistakenly connecting a certain input terminal with the output terminal, causing the emergency generator set being repaired to be energized, thereby preventing electric shock accidents.

[0068] In some embodiments, Figure 1 As shown, the emergency safety power supply circuit of the nuclear power plant also includes a first input control switch 7 and a second input control switch 8. The first input control switch 7 and the second input control switch 8 may include circuit breakers, respectively. Specifically, the first input control switch 7 is connected between the first input terminal and the first switch unit 2, and the first input control switch 7 is used to control the on-off of the line; the second input control switch 8 is connected between the second input terminal and the second switch unit 4, and the second input control switch 8 is used to control the on-off of the line.

[0069] In this embodiment, the first input control switch 7 and the second input control switch 8 are respectively used as redundantly designed circuit breakers on the corresponding lines, and can be manually controlled circuit breakers. This ensures that the corresponding lines can be disconnected even when the first switch unit 2 or the second switch unit 4 fails, thereby improving safety.

[0070] See also Figure 1 The working principle of the utility model is as follows: if the first emergency generator set 10 needs to be repaired during the operation of the nuclear power plant unit, the first closing mechanism 112 can be pushed into Figure 1 The leftmost first switch interval 111 is turned on to close the first switch interval, and then the second closing mechanism 122 is pushed into the Figure 1The second second switch interval 121 from the left in the figure is closed to make the second switch interval 121 conductive, and then the two emergency bus switch units 6, the first input control switch 7 and the first switch unit 2 connected to the first emergency generator set 10 are closed, and the third switch unit 51 and the fourth switch unit 61 are disconnected, so that the first power generation unit 3 and the second power generation unit 5 can replace the first emergency generator EDG1 and the second emergency generator EDG2 in turn, so that even if an external power failure occurs during the maintenance of the first emergency generator set 10, as long as the first power generation unit 3 and the second power generation unit 5 are controlled to work, the emergency power supply can be provided to the corresponding nuclear power plant unit; if any emergency generator in the first emergency generator set 10 is found to be faulty after maintenance, the first power generation unit 3 or the second power generation unit 5 can temporarily replace the function of the faulty emergency generator through the above method, thereby providing sufficient maintenance time for the faulty emergency generator without affecting the operation of the nuclear power plant. It is understandable that when the second emergency generator set 20 is inspected or repaired, the first power generation unit 3 and the second power generation unit 5 replace the third emergency generator EDG3 and the fourth emergency generator EDG4 in a manner similar to the above-mentioned manner, which will not be repeated here.

[0071] It can be understood that the implementation of the technical solution of the utility model can enable the first power generation unit and the second power generation unit to temporarily replace the functions of the corresponding emergency power generation units (including the first emergency power generation unit and the second emergency power generation unit), so that the emergency power generation units can be overhauled during the operation of the nuclear power plant units, thereby improving the flexibility of the overhaul of the emergency power generation units and significantly improving the operating stability and economic benefits of the nuclear power plant.

[0072] like Figure 2 As shown, the utility model also provides a nuclear power plant emergency safety power supply system, including the nuclear power plant emergency safety power supply circuit provided by the utility model.

[0073] 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 belong to the scope covered by the claims of the utility model.

Claims

1. A nuclear power plant emergency safety power supply circuit, characterized in that: include: A first emergency generator set (10), comprising two first emergency busbars (30); A second emergency generator set (20), comprising two second emergency busbars (40); A switching unit (1), comprising a first input end, a second input end and four output ends, two of the four output ends being respectively connected to two of the first emergency busbars (30), and the other two of the output ends being respectively connected to two of the second emergency busbars (40); The switching unit (1) is used to control the first input end to be connected to one of the four output ends and / or to control the second input end to be connected to one of the four output ends; A first switch unit (2); A first power generation unit (3), connected to the first input terminal via the first switch unit (2), for providing emergency power; A second switch unit (4); as well as The second power generation unit (5) is connected to the second input terminal via the second switch unit (4) and is used to provide emergency power.

2. The nuclear power plant emergency safety power supply circuit according to claim 1, characterized in that: The switching unit (1) comprises: A first sub-switching unit (11), comprising a first sub-input terminal and four first sub-output terminals, and used for connecting the first sub-input terminal to one of the four first sub-output terminals according to an operation; A second sub-switching unit (12), comprising a second sub-input terminal and four second sub-output terminals, and used for connecting the second sub-input terminal to one of the four second sub-output terminals according to an operation; The first sub-input end is connected to the first power generation unit (3) via the first switch unit (2), the second sub-input end is connected to the second power generation unit (5) via the second switch unit (4), two of the four first sub-output ends are respectively connected to two of the first emergency busbars (30), and the other two first sub-output ends are respectively connected to two of the second emergency busbars (40); Two of the four second sub-output terminals are respectively connected to two second emergency busbars (40), and the other two second sub-output terminals are respectively connected to two first emergency busbars (30).

3. The nuclear power plant emergency safety power supply circuit according to claim 2, characterized in that: The first sub-switching unit (11) comprises: Four first switch bays (111), wherein the first ends of two of the four first switch bays (111) are respectively connected to the two first emergency busbars (30), and the first ends of the other two first switch bays (111) are respectively connected to the two second emergency busbars (40), and the node after the second end of each first switch bay (111) is connected to the first power generation unit (3) via the first switch unit (2); and A first closing mechanism (112) for controlling one of the four first switch intervals (111) to close according to an operation; The second sub-switching unit (12) comprises: Four second switch bays (121), wherein the first ends of two of the four second switch bays (121) are respectively connected to the two second emergency busbars (40), and the first ends of the other two second switch bays (121) are respectively connected to the two first emergency busbars (30), and the node after the second end of each second switch bay (121) is connected to the second power generation unit (5) via the second switch unit (4); and A second closing mechanism (122) is used for controlling one of the four second switch intervals (121) to close according to operation.

4. The nuclear power plant emergency safety power supply circuit according to claim 3, characterized in that: Each of the first switch bays (111) and each of the second switch bays (121) is a medium voltage switch cabinet; The first closing mechanism (112) and the second closing mechanism (122) are both isolation trolleys capable of controlling the medium voltage switch cabinet to be turned on or off.

5. The nuclear power plant emergency safety power supply circuit according to claim 1, characterized in that: The first power generation unit (3) and the second power generation unit (5) are both diesel generators.

6. The nuclear power plant emergency safety power supply circuit according to claim 1, characterized in that: The first emergency generator set (10) further comprises a third switch unit (51), a fourth switch unit (61), a first emergency generator EDG1, a second emergency generator EDG2, and two fifth switch units (71); The first emergency generator EDG1 is connected to one of the two first emergency busbars (30) via the third switch unit (51), and the second emergency generator EDG2 is connected to the other first emergency busbar (30) via the fourth switch unit (61), and the two first emergency busbars (30) are also respectively connected to the second ends of the two fifth switch units (71), and the first ends of the two fifth switch units (71) are respectively used to output emergency power; The second emergency generator set (20) further comprises a sixth switch unit (52), a seventh switch unit (62), a third emergency generator EDG3, a fourth emergency generator EDG4, and two eighth switch units (72); The third emergency generator EDG3 is connected to one of the two second emergency busbars (40) via the sixth switch unit (52), and the fourth emergency generator EDG4 is connected to the other second emergency busbar (40) via the seventh switch unit (62). The two second emergency busbars (40) are also respectively connected to the second ends of the two eighth switch units (72), and the first ends of the two eighth switch units (72) are respectively used to output emergency power.

7. The nuclear power plant emergency safety power supply circuit according to any one of claims 1 to 6, characterized in that: The nuclear power plant emergency safety power supply circuit also includes four emergency bus switch units (6); Each of the emergency bus switch units (6) is respectively connected in series between each of the output ends and two of the first emergency bus bars (30) and two of the second emergency bus bars (40).

8. The nuclear power plant emergency safety power supply circuit according to claim 7, characterized in that: The first switch unit (2), the second switch unit (4) and each of the emergency bus switch units (6) respectively comprise a circuit breaker.

9. The nuclear power plant emergency safety power supply circuit according to any one of claims 1 to 6, characterized in that: The nuclear power plant emergency safety power supply circuit also includes: a first input control switch (7), connected between the first input terminal and the first switch unit (2); and A second input control switch (8) is connected between the second input terminal and the second switch unit (4).

10. A nuclear power plant emergency safety power supply system, characterized in that: It comprises the emergency safety power supply circuit of a nuclear power plant as claimed in any one of claims 1 to 9.

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