Emergency power supply system of nuclear power plant
By setting up the nuclear island and the conventional island emergency power system separately, and setting up the emergency power system independently on the conventional island, using low-voltage and low-capacity conventional island diesel generators, the problem of high equipment costs of the nuclear power plant emergency power system is solved, and the effect of reducing engineering costs and improving the reliability of emergency power is achieved.
Patent Information
- Application Number
- CN202510320784.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2025-05-13
AI Technical Summary
The existing nuclear power plant emergency power system relies on high-level nuclear island emergency diesel generators, resulting in high equipment costs. As the design capacity of nuclear power plant units expands, emergency load increases, and the demand for diesel generator capacity increases, resulting in further increase in engineering costs.
By setting up the nuclear island and the conventional island emergency power system separately, there is no impact on each other, and an emergency power system is set up independently on the conventional island, using non-safe level low-voltage, low-capacity conventional island 380V diesel generators, the capacity and engineering cost of the nuclear island diesel generator are reduced.
It effectively reduces the capacity and engineering cost of the nuclear island diesel generator, while improving the reliability of the nuclear island emergency power supply, and ensuring the reliability of the conventional island emergency power supply.
Smart Images
Figure CN119995131A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of nuclear power, and more particularly to an emergency power supply system for a nuclear power plant. Background Art
[0002] The conventional island emergency power supply system of a nuclear power plant mainly provides safe, reliable and continuous power supply for the conventional island emergency load. The conventional island emergency load of a nuclear power plant refers to the load that should continue to be powered by the AC emergency power supply in the event of a power outage in the entire plant or when the unit loses power supply to the plant, in order to ensure the safe shutdown of the steam turbine generator set or to prevent endangerment to personal safety.
[0003] At present, the conventional island emergency power supply system of the nuclear power plant is composed of 10 / 0.4kV dry-type transformers and 380V low-voltage AC distribution panels. The 10kV power supply is connected to the 10kV emergency bus A of the nuclear island through cables. Under normal circumstances, the 10kV emergency bus is powered by the high-voltage plant working transformer through the 10kV working buses B and C respectively; in the event of an accident, it switches to the auxiliary transformer and still supplies power through the working buses B and C respectively; when both of the above two power sources are lost, the 10kV emergency diesel generator set of the nuclear island supplies power to the bus.
[0004] As the emergency safety power supply for the whole plant, the emergency diesel generator of a nuclear power plant is directly related to nuclear safety. Its purpose is to ensure the safe shutdown of the unit and prevent damage to key equipment when both the plant working power supply and auxiliary power supply of the nuclear power plant fail. It plays a very important role in protecting the fuel elements from damage and ensuring nuclear safety.
[0005] However, the nuclear island emergency diesel generator belongs to 1E-level equipment, using 10kV voltage level, and most of the system equipment it carries is of nuclear safety level. Due to the high safety level of the equipment, China currently does not have the ability to independently design and manufacture it. Almost all existing nuclear power diesel generator sets are imported from Germany's MTU / AREVA and France's ALSTOM, and the price is very expensive.
[0006] In recent years, as the design capacity of nuclear power plant units has continued to expand, the emergency loads of the nuclear island and conventional island have increased dramatically, and the required capacity of the nuclear island emergency diesel generators has also increased accordingly, which not only brings difficulties to the design and selection, but also increases the project cost.
[0007] Therefore, there is still a lack of solutions in the art for improving the reliability of the emergency power supply of the nuclear island in a more economical way while ensuring the reliability of the emergency power supply of the conventional island. Summary of the invention
[0008] The purpose of the present invention is to provide a nuclear power plant emergency power supply system, which can effectively reduce the capacity of nuclear island diesel generators, reduce project costs, and improve the reliability of nuclear island emergency power supply while ensuring the reliability of conventional island emergency power supply.
[0009] The present invention provides an emergency power supply system for a nuclear power plant, the system comprising:
[0010] The first emergency busbar;
[0011] a first working busbar, wherein the first working busbar is connected to the first emergency busbar;
[0012] a first auxiliary bus, the first auxiliary bus being connected to the first working bus, and being connected to the first emergency bus through the first working bus; and
[0013] A conventional island emergency power supply system, wherein the conventional island emergency power supply system is connected to the first working bus, and the conventional island emergency power supply system comprises a transformer connected to the first working bus, a conventional island 380V emergency bus connected to the transformer, and a conventional island 380V diesel generator connected to the conventional island 380V emergency bus.
[0014] In another preferred example, the first emergency bus is connected to the first nuclear island diesel generator.
[0015] In another preferred example, the first nuclear island diesel generator is a nuclear island 10kV diesel generator.
[0016] In another preferred example, the first emergency bus is a 10kV emergency bus.
[0017] In another preferred example, the first working bus is a 10kV working bus.
[0018] In another preferred example, the first auxiliary bus is a 10kV auxiliary bus.
[0019] In another preferred example, the first auxiliary bus is connected to a first auxiliary transformer.
[0020] In another preferred example, the system further includes a second emergency bus, a second working bus and a second auxiliary bus, wherein the second emergency bus is connected to the second working bus, the second auxiliary bus is connected to the second working bus, and is connected to the second emergency bus through the second working bus.
[0021] In another preferred example, the second emergency bus is a 10kV emergency bus.
[0022] In another preferred example, the second working bus is a 10kV working bus.
[0023] In another preferred example, the second auxiliary bus is a 10kV auxiliary bus.
[0024] In another preferred example, the second emergency bus is connected to the second nuclear island diesel generator.
[0025] In another preferred example, the second nuclear island diesel generator is a nuclear island 10kV diesel generator.
[0026] In another preferred example, the second auxiliary bus is connected to a second auxiliary transformer.
[0027] In another preferred example, the first auxiliary busbar and the second auxiliary busbar are connected.
[0028] In another preferred example, the first working bus is connected to a high-voltage plant transformer.
[0029] In another preferred example, the first working bus is connected to the high-voltage plant transformer through a third working bus.
[0030] In another preferred example, the third working bus is a 10kV working bus.
[0031] In another preferred example, the second working bus is connected to a high-voltage plant transformer.
[0032] In another preferred example, the second working bus is connected to the high-voltage plant transformer via a fourth working bus.
[0033] In another preferred example, the fourth working bus is a 10kV working bus.
[0034] In another preferred example, the high-voltage plant transformer is connected to the main line and is connected between the main transformer and the generator on the main line.
[0035] In another preferred example, the conventional island 380V diesel generator is arranged in a dedicated diesel generator room near the conventional island plant, and supplies power to the conventional island 380V emergency bus through a cable.
[0036] It should be understood that within the scope of the present invention, the above-mentioned technical features of the present invention and the technical features specifically described below (such as embodiments) can be combined with each other to form a new or preferred technical solution. Due to space limitations, they will not be described one by one here. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0038] Figure 1It is a circuit diagram of a nuclear power plant emergency power supply system in one example of the present invention. DETAILED DESCRIPTION
[0039] After extensive and in-depth research and a large number of screenings, the inventor has developed a nuclear power plant emergency power supply system for the first time. Compared with the prior art, the present invention sets up the nuclear island and conventional island emergency power supply systems separately without affecting each other, which not only reduces the capacity of the nuclear island diesel generator, but also improves the reliability of the nuclear island emergency power supply. At the same time, the circuits and equipment are simplified, and the reliability of the conventional island emergency power supply is also guaranteed because the conventional island has an independent emergency power supply system. The present invention was completed on this basis.
[0040] The main advantages of the present invention include:
[0041] (a) It can effectively reduce the capacity of nuclear island diesel generators, simplify the lines, and reduce the project cost;
[0042] (b) While ensuring the reliability of the emergency power supply for the conventional island, the reliability of the emergency power supply for the nuclear island is improved;
[0043] (c) The emergency power supply systems of the nuclear island and the conventional island are set up separately without affecting each other, thus reducing the requirements for emergency power supply.
[0044] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, the accompanying drawings are schematic diagrams, so the device and apparatus of the present invention are not limited by the size or ratio of the schematic diagrams.
[0045] It should be noted that in the claims and description of this patent, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0046] Example
[0047] The nuclear power plant emergency power supply system of this embodiment is as follows Figure 1As shown. In the emergency power supply system of the nuclear power plant, the high-voltage plant transformer is connected to the main line and is connected between the main transformer and the generator on the main line. The system has four working buses, namely 10kV working bus A, 10kV working bus B, 10kV working bus C and 10kV working bus D. Among them, 10kV working bus A and 10kV working bus D are directly connected to the high-voltage plant transformer, 10kV working bus B is connected to 10kV working bus A, and 10kV working bus C is connected to 10kV working bus D. 10kV emergency bus A is connected to 10kV working bus B, and 10kV emergency bus B is connected to 10kV working bus C. 10kV emergency bus A and 10kV emergency bus B are also connected to a 10kV diesel generator of a nuclear island respectively. In addition, the 10kV working bus B is connected to a 10kV auxiliary bus A, and the 10kV working bus C is connected to a 10kV auxiliary bus B. The 10kV auxiliary bus A is connected to the auxiliary transformer A, and the 10kV auxiliary bus B is connected to the auxiliary transformer B. The 10kV auxiliary bus A is connected to the 10kV auxiliary bus B.
[0048] The conventional island emergency power supply system is connected to the 10kV working bus B, where the transformer is directly connected to the 10kV working bus B, the conventional island 380V emergency bus is connected to the transformer, and the conventional island 380V diesel generator is connected to the conventional island 380V emergency bus.
[0049] The high-voltage side power supply of the 10 / 0.4kV emergency transformer of the conventional island is connected to the 10kV working bus B or 10kV working bus C, and a 380V diesel generator with quick start dedicated to the conventional island is set up on the conventional island. Under normal circumstances, the emergency power supply of the conventional island is connected by cables from the 10kV working bus B or C, and the 10kV working bus B or C is powered by the high-voltage plant working transformer; when the high-voltage plant transformer loses power, the 10kV working bus B or C is switched to the auxiliary transformer; when both of the above two power supplies are lost, the 380V diesel generator connected to the 380V emergency bus of the conventional island is used for power supply.
[0050] The diesel generator is considered to be arranged in a special diesel generator room near the conventional island plant, and supply power to the 380V emergency busbar of the conventional island through cables. This diesel generator is a non-safety-grade device with low voltage, small capacity and low cost.
[0051] Nuclear island emergency plant equipment is safety-level (1E-level) plant equipment used to prevent, limit and reduce the leakage of radioactive materials, while conventional island emergency plant equipment is non-safety-level equipment used to ensure the safe shutdown of steam turbine generator sets.
[0052] The present invention utilizes this feature to set up the emergency power supply systems of the nuclear island and the conventional island separately without affecting each other, which not only reduces the capacity of the nuclear island diesel generator, but also improves the reliability of the nuclear island emergency power supply. At the same time, since the conventional island is independently equipped with an emergency power supply system, the reliability of the conventional island emergency power supply is also guaranteed.
[0053] All documents mentioned in the present invention are cited as references in this application, just as each document is cited as reference individually. In addition, it should be understood that after reading the above teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.
Claims
1. A nuclear power plant emergency power supply system, characterized in that: The system comprises: The first emergency busbar; a first working busbar, wherein the first working busbar is connected to the first emergency busbar; a first auxiliary bus, the first auxiliary bus being connected to the first working bus, and being connected to the first emergency bus through the first working bus; and A conventional island emergency power supply system, wherein the conventional island emergency power supply system is connected to the first working bus, and the conventional island emergency power supply system comprises a transformer connected to the first working bus, a conventional island 380V emergency bus connected to the transformer, and a conventional island 380V diesel generator connected to the conventional island 380V emergency bus.
2. The system according to claim 1, characterized in that The first emergency bus is connected to the first nuclear island diesel generator.
3. The system according to claim 1, characterized in that The system further comprises a second emergency bus, a second working bus and a second auxiliary bus, wherein the second emergency bus is connected to the second working bus, and the second auxiliary bus is connected to the second working bus and connected to the second emergency bus through the second working bus.
4. The system according to claim 3, characterized in that The second emergency bus is connected to the second nuclear island diesel generator.
5. The system according to claim 3, characterized in that The first auxiliary bus is connected to a first auxiliary transformer, and the second auxiliary bus is connected to a second auxiliary transformer.
6. The system according to claim 1, wherein: The first working bus is connected to the high-voltage plant transformer.
7. The system according to claim 6, characterized in that The first working bus is connected to the high-voltage plant transformer via a third working bus.
8. The system according to claim 3, characterized in that The second working bus is connected to the high-voltage plant transformer.
9. The system according to claim 8, characterized in that The second working bus is connected to the high-voltage plant transformer via a fourth working bus.
10. The system according to claim 1, wherein: The conventional island 380V diesel generator is arranged in a special diesel generator room near the conventional island plant, and supplies power to the conventional island 380V emergency busbar through cables.