A priority selection driver cabinet for a safety class instrument control system of a nuclear power plant

Abstract

The utility model relates to nuclear power technology field, concretely relates to a priority selection drive machine cabinet for nuclear power plant safety level instrument control system, including the cabinet body, the cabinet body is equipped with machine cabinet power supply device, signal transmission device, equipment drive device and priority drive machine case from top to bottom in proper order in it, signal transmission device links with upstream control system, signal transmission device links with priority drive machine case, and priority drive machine case links with equipment drive device, priority drive machine case includes terminal unit, IO card spare and priority control module, and priority drive machine case sets up a plurality of priority control modules according to the controlled equipment quantity, and priority control module is configured as receiving drive command and according to the priority height selection output drive command, the utility model replaces the complex circuit of relay and other logic elements, can save a large number of spaces under the condition of realizing same selection drive logic, reduces the system complexity, improves the reliability, reaches shorter response time.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power technology, and more specifically, to a priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant. Background Technology

[0002] As a core component ensuring the safe and stable operation of nuclear power units, the reliability and accuracy of the drive signals in a nuclear power plant's safety-grade instrumentation and control system directly affect the plant's safety performance. In a nuclear power plant's control system, drive signals for field equipment (such as pumps and valves) typically originate from multiple independent control systems, including the safety-grade DCS, Emergency Control Panel (ECP), Backup Panel (BUP), Decentralized Control System (DAS), and Non-Safety-Grade DCS (NC-DCS). Due to differences in safety levels, signal priorities, and functional positioning among these systems, drive signals may encounter problems during transmission, such as signal conflicts and command confusion caused by partial system failures. This can lead to equipment malfunctions or failures to operate, threatening the safe operation of the nuclear power plant. Prioritizing multi-source drive signals is an effective means of resolving signal conflicts and preventing equipment malfunctions or failures to operate.

[0003] In existing technologies, this requirement is typically addressed using drive signal selection logic schemes based on discrete components such as relays. However, this traditional approach has significant drawbacks: Firstly, relay arrays rely on a large number of hardware contacts for logic judgment, resulting in complex structures and cumbersome wiring, leading to a large footprint within the cabinet and making it difficult to meet the compact design requirements of nuclear power plant instrumentation and control systems. Secondly, the action delay of relay mechanical contacts (such as engagement and release times) results in long signal processing response times, failing to meet the stringent real-time control requirements of safety-grade instrumentation and control systems. Furthermore, mechanical contacts are susceptible to environmental factors such as vibration and electromagnetic interference, leading to problems such as poor contact and low reliability. Additionally, the signal isolation and feedback mechanisms constructed from discrete components have weak anti-interference capabilities, making it difficult to achieve efficient communication and status monitoring across multiple chassis, further increasing system complexity and maintenance costs.

[0004] To address the aforementioned issues, there is an urgent need for a drive cabinet capable of efficiently processing multi-source drive signals and possessing highly reliable priority judgment capabilities, in order to achieve precise selection and stable output of drive signals. Utility Model Content

[0005] The purpose of this invention is to provide a priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant, in order to solve the technical problem of how to efficiently process multi-source drive signals and provide high-reliability priority judgment capabilities.

[0006] This utility model is achieved through the following technical solution: a priority selection drive cabinet for a safety-level instrumentation and control system in a nuclear power plant, comprising a cabinet body, wherein a cabinet power supply device, a signal transmission device, an equipment drive device, and a priority drive chassis are arranged sequentially from top to bottom inside the cabinet body;

[0007] The signal transmission device, the equipment driving device, and the priority driving chassis are all electrically connected to the cabinet power supply device. The signal input terminal of the signal transmission device is connected to the signal output terminal of the upstream control system. The signal output terminal of the signal transmission device is connected to the signal input terminal of the priority driving chassis. The signal output terminal of the priority driving chassis is connected to the signal input terminal of the equipment driving device.

[0008] The priority drive chassis and device drive device are configured in multiple ways according to the number of controlled devices. The priority drive chassis consists of a terminal unit, an I / O card and a priority control module. Each priority drive chassis is configured with multiple priority control modules according to the number of controlled devices. The hardware of the priority control module is an FPGA module, which is configured to receive drive commands and select the output drive commands according to the priority. The I / O card is bidirectionally connected to the priority control module, and the terminal unit is bidirectionally connected to the I / O card.

[0009] According to a preferred embodiment, the signal input terminal of the signal transmission device is connected to the signal output terminal of the upstream control system via hardwiring.

[0010] According to a preferred embodiment, the signal transmission device is equipped with a signal acquisition and isolation module, which consists of a signal isolator and an active isolation relay. The signal input terminals of the signal isolator and the active isolation relay are connected to the signal output terminals of the upstream control system, and the signal output terminals of the signal isolator and the active isolation relay are connected to the signal input terminals of the terminal unit.

[0011] According to a preferred embodiment, the priority drive chassis is further configured with a management card, which is connected to each priority control module via the chassis back panel and cascaded with each priority drive chassis via fiber optic patch cords.

[0012] According to a preferred embodiment, the signal transmission device is further configured with an optical fiber communication module. In each priority drive chassis, the signal output terminal of the management card of one of the priority drive chassis is connected to the signal input terminal of the optical fiber communication module. The signal output terminal of the optical fiber communication module is connected to the signal input terminal of the upstream control system to output the feedback signal of the controlled device to the upstream control system.

[0013] According to a preferred embodiment, the optical fiber communication module comprises a splitter, a protocol conversion module, and an optical fiber terminal box. The signal output terminal of the management card is connected to the signal input terminal of the splitter. The first signal output terminal of the splitter is connected to the signal input terminal of the protocol conversion module. The second signal output terminal of the splitter is connected to the first signal input terminal of the optical fiber terminal box. The signal output terminal of the protocol conversion module is connected to the second signal input terminal of the optical fiber terminal box.

[0014] According to a preferred embodiment, the device drive has two outputs, one of which is equipped with a drive terminal and the other is equipped with a solid-state relay.

[0015] According to a preferred embodiment, the cabinet power supply device consists of an internal power supply module, a drive power supply module, and a control circuit breaker. The priority drive chassis is also equipped with a power supply card. The internal power supply module is electrically connected to the power supply card via the control circuit breaker, and the drive power supply module is electrically connected to the equipment drive device.

[0016] According to a preferred embodiment, each of the priority drive chassis is equipped with a cooling fan.

[0017] According to a preferred embodiment, the system further includes a status monitoring device and a rack status light. The status monitoring device consists of a temperature monitoring module, a power monitoring module, and a cooling fan monitoring module configured in the corresponding position of the rack. The temperature monitoring module, power monitoring module, and fan monitoring module are all electrically connected to the rack status light.

[0018] The technical solution provided by this utility model for a priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant has at least the following advantages and beneficial effects: This priority selection drive cabinet replaces the complex circuits of logic elements such as relays. Under the same selection drive logic, it can save a lot of space, reduce system complexity, improve reliability, and achieve a shorter response time. Attached Figure Description

[0019] Figure 1 An architectural diagram of the priority selection drive cabinet provided in Embodiment 1 of this utility model;

[0020] Figure 2 A front view of the priority selection drive cabinet provided in Embodiment 1 of this utility model;

[0021] Figure 3 Rear view of the priority selection drive cabinet provided in Embodiment 1 of this utility model;

[0022] Figure 4 for Figure 2 Schematic diagram of section AA;

[0023] Figure 5 for Figure 2 Schematic diagram of the BB section;

[0024] Reference numerals: 1-Rack power supply device, 11-Rack power supply module, 12-Drive power supply module, 13-Control circuit breaker, 2-Signal transmission device, 21-Signal isolator, 22-Active isolation relay, 23-Optical splitter, 24-Protocol conversion module, 25-Fiber optic terminal box, 3-Priority drive chassis, 31-Power supply card, 32-Management card, 33-Priority control module, 34-IO card, 35-Terminal unit, 4-Equipment drive device, 41-Solid-state relay, 42-Drive terminal, 5-Rack auxiliary device, 51-Cooling fan, 52-Temperature monitoring module, 53-Power supply monitoring module, 54-Cooling fan monitoring module, 55-Rack status light. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Example 1

[0027] This utility model embodiment provides a priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant. (See also...) Figure 1 As shown, the cabinet consists of five main parts: a cabinet power supply unit 1, a signal transmission unit 2, an equipment drive unit 4, a priority drive chassis 3, and cabinet auxiliary devices 5; see also Figures 2 to 5 As shown, the cabinet power supply device 1, signal transmission device 2, equipment drive device 4, and priority drive chassis 3 are arranged sequentially inside the cabinet from top to bottom.

[0028] Specifically, the signal input terminal of the signal transmission device 2 is connected to the signal output terminal of the upstream control system to receive drive commands issued by multiple independent control systems, such as safety-level DCS, emergency control panel (ECP), backup panel (BUP), diversified control system (DAS), and non-safety-level DCS (NC-DCS), to realize the input of external signals; the signal output terminal of the signal transmission device 2 is connected to the signal input terminal of the priority drive chassis 3 to send the drive commands to the priority drive chassis 3 for priority judgment and priority logic processing; the signal output terminal of the priority drive chassis 3 is connected to the signal input terminal of the device drive device 4 to output the highest priority drive command to the controlled device through the device drive device 4, thereby realizing device drive externally.

[0029] The following provides a detailed explanation of each of the main components:

[0030] Regarding the priority drive chassis 3, in this embodiment, multiple priority drive chassis 3 are provided according to the number of controlled devices. For example, in this embodiment, there are a total of 3 priority drive chassis 3. Each priority drive chassis 3 is composed of a power supply card 31, a management card 32, a terminal unit 35, an IO card 34, and a priority control module 33. Among them, the power supply card 31 and the management card 32 are redundantly configured, with 2 of each. Each priority drive chassis 3 is provided with multiple priority control modules 33 according to the number of controlled devices. Specifically, in this embodiment, there are 12 priority control modules 33, and each priority control module 33 corresponds to one controlled device, such as a pump or valve.

[0031] The hardware of the priority control module 33 is an FPGA module, which is configured to receive drive commands and select output drive commands according to their priority. The priority control module 33 integrates hardware and priority judgment algorithms to ensure reasonable output of device drive signals. In this embodiment, the priority control module 33 uses a preset priority order, such as the highest priority for safety-level DCS signals and the lowest priority for NC-DCS signals, and adopts an "interrupt trigger + polling" mechanism to process signals. When a high-priority signal (such as an emergency signal issued by ECP) ​​is detected, the processing of low-priority signals is immediately interrupted, and the drive command corresponding to the high-priority signal is output first to ensure that emergency operations are executed first. If there is no high-priority signal, other signals are processed in sequence to ensure that each signal has a chance to be processed. The above is only a preferred embodiment, and no specific limitation is made to the priority judgment logic here.

[0032] Terminal unit 35 is the physical interface module for external wiring of the cabinet. It is used to realize the electrical connection between external hard-wired signals and internal cards, and has the functions of signal distribution and wiring fixation. As an intermediate link for signal conversion, IO card 34 needs to support both input signal acquisition and output command driving. The input function converts the signal input to terminal unit 35 into a level signal that can be processed by priority control module 33. The output function converts the logic level output by priority control module 33 into a drive signal suitable for the controlled device, and then outputs it through terminal unit 35.

[0033] The IO card 34 is bidirectionally connected to the priority control module 33, and the terminal unit 35 is bidirectionally connected to the IO card 34. Specifically, the bidirectional connection between the terminal unit 35 and the IO card 34 is manifested in the following way: the drive commands from the external control system (such as a safety-grade DCS or ECP) ​​are accessed through the terminal terminals of the terminal unit 35, transmitted to the input channel of the IO card 34 via cable, and then the IO card 34 converts the accessed signal into a level signal that the priority control module 33 can process, and then transmits the level signal to the priority control module 33 for priority judgment processing; the highest priority drive command processed by the priority control module 33 is transmitted through the output channel of the IO card 34, and then the IO card 34 converts the logic level into a drive signal suitable for the controlled device, and then transmits it to the controlled device through the terminal block of the terminal unit 35.

[0034] The management card 32 is connected to each priority control module 33 via the chassis back panel, and is cascaded with each priority drive chassis 3 via fiber optic patch cords. It is used to cooperate with the signal transmission device 2 to realize the status feedback of the controlled equipment and the periodic test feedback function. For details, please refer to the subsequent description of the signal transmission device 2.

[0035] In addition, the priority drive chassis 3 can also receive periodic test output lockout signals transmitted from the upstream control system; a set of local operation components are configured on the priority control module 33 to realize the output of local control drive commands, which will not be elaborated on here.

[0036] Regarding the signal transmission device 2, in this embodiment, the signal transmission device 2 is connected to the signal output terminal of the upstream control system and the signal output terminal of the controlled device through hard wiring, and is used to collect the drive commands of the upstream control system and the feedback signals of the controlled device.

[0037] Considering the low signal security level of upstream control systems such as DAS and NC-DCS, isolation processing is required. Therefore, in this embodiment, the signal transmission device 2 is equipped with a signal acquisition and isolation module. The signal acquisition and isolation module consists of a signal isolator 21 and an active isolation relay 22. The signal input terminals of the signal isolator 21 and the active isolation relay 22 are connected to the signal output terminals of the upstream control system, and the signal output terminals of the signal isolator 21 and the active isolation relay 22 are connected to the signal input terminals of the terminal unit 35. The signals from upstream control systems with low security levels, such as DAS and NC-DCS, are first isolated by the signal acquisition and isolation module before being input to the terminal unit 35.

[0038] For the feedback signals from the controlled devices, the signal transmission device 2 is also equipped with an optical fiber communication module. In each priority drive chassis 3, the signal output terminal of the management card 32 of one of the priority drive chassis 3 is connected to the signal input terminal of the optical fiber communication module. Specifically, in this embodiment, all feedback signals from the controlled devices received by the priority drive chassis 3 are output to the optical fiber communication module through the TX port of the management card 32 of the first priority drive chassis 3. The signal output terminal of the optical fiber communication module is connected to the signal input terminal of the upstream control system to output the feedback signals from the controlled devices to the upstream control system.

[0039] Specifically, in this embodiment, the optical fiber communication module consists of a splitter 23, a protocol conversion module 24, and an optical fiber terminal box 25; the signal output end of the management card 32 is connected to the signal input end of the splitter 23, and the signal is split into two paths by the splitter 23.

[0040] The first signal output terminal of the optical splitter 23 is connected to the signal input terminal of the protocol conversion module 24. The protocol conversion module 24 performs protocol conversion processing on the feedback signal. The signal output terminal of the protocol conversion module 24 is connected to the second signal input terminal of the fiber optic terminal box 25, so that the second feedback signal is output to the upstream non-security-level instrumentation and control system through the fiber optic terminal box 25 to achieve unidirectional transmission. The second signal output terminal of the optical splitter 23 is connected to the first signal input terminal of the fiber optic terminal box 25. After fiber splicing, the first feedback signal is output to the upstream security-level instrumentation and control system through the fiber optic terminal box 25. The security-level instrumentation and control system then transmits the collected and received signals back to the management card 32TX port of the No. 1 priority drive chassis 3 through the optical cable.

[0041] Regarding the device drive 4, in this embodiment, multiple device drive 4 are provided according to the number of controlled devices; further, the device drive 4 has two outputs, one of which is equipped with a drive terminal 42, and the other is equipped with a solid-state relay 41. When it is necessary to increase the drive power, the solid-state relay 41 is used for output, and in other cases, the output is through the drive terminal 42.

[0042] Regarding the cabinet power supply device 1, in this embodiment, the cabinet power supply device 1 consists of an internal power supply module 11, a drive power supply module 12, and a control circuit breaker 13. The internal power supply module 11 is electrically connected to the power supply card 31 via the control circuit breaker, and the drive power supply module 12 is electrically connected to the device drive device 4. In some preferred embodiments, the internal power supply module 11 provides redundant 24VDC power supply for two channels. For single-channel wired devices, it is connected via diode coupling, while for dual-channel wired devices, it is directly connected and coupled inside the device. The drive power supply module 12 is either 48VDC power supply (for some solenoid valves) or 24VDC power supply, depending on whether it is a direct or indirect drive. The drive power supply module 12 is connected to the output circuit of the priority drive chassis 3 via a protection circuit breaker to drive the controlled device.

[0043] Regarding the rack auxiliary device 5, in this embodiment, the rack auxiliary device 5 includes a cooling fan 51, a status monitoring device, and a rack status light 55. The status monitoring device is composed of a temperature monitoring module 52, a power monitoring module 53, and a cooling fan 51 monitoring module. The cooling fan 51 is configured on each of the priority drive chassis 3. In addition, a door fan is configured on the rack door to achieve rack heat dissipation. The temperature monitoring module 52, the power monitoring module 53, and the cooling fan 51 monitoring module are configured in corresponding positions in the rack to achieve signal acquisition. The temperature monitoring module 52, the power monitoring module 53, and the fan monitoring module are all electrically connected to the rack status light 55. When the status monitoring device detects an abnormality in the rack, it will report it through the rack status light 55. In addition, it can also report it through the communication network, thereby realizing the detection and diagnostic alarm of the rack status.

[0044] In summary, this priority selection drive cabinet replaces the complex circuitry of logic components such as relays. Compared to implementing the same selection drive logic using a large number of relays and other components, it can save a significant amount of space, reduce system complexity, improve reliability, and achieve a shorter response time.

[0045] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant, characterized in that, The cabinet includes a cabinet body, and inside the cabinet body, from top to bottom, are arranged a cabinet power supply device (1), a signal transmission device (2), an equipment drive device (4), and a priority drive chassis (3); The signal transmission device (2), the equipment driving device (4) and the priority driving chassis (3) are all electrically connected to the cabinet power supply device (1). The signal input terminal of the signal transmission device (2) is connected to the signal output terminal of the upstream control system. The signal output terminal of the signal transmission device (2) is connected to the signal input terminal of the priority driving chassis (3). The signal output terminal of the priority driving chassis (3) is connected to the signal input terminal of the equipment driving device (4). The priority drive chassis (3) and the device drive device (4) are configured in multiple ways according to the number of controlled devices. The priority drive chassis (3) consists of a terminal unit (35), an IO card (34) and a priority control module (33). Each priority drive chassis (3) is configured with multiple priority control modules (33) according to the number of controlled devices. The hardware of the priority control module (33) is an FPGA module, which is configured to receive drive commands and select the output drive commands according to the priority. The IO card (34) is bidirectionally connected to the priority control module (33), and the terminal unit (35) is bidirectionally connected to the IO card (34).

2. The priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant as described in claim 1, characterized in that, The signal input terminal of the signal transmission device (2) is connected to the signal output terminal of the upstream control system via hard wiring.

3. The priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant as described in claim 1, characterized in that, The signal transmission device (2) is equipped with a signal acquisition and isolation module, which consists of a signal isolator (21) and an active isolation relay (22). The signal input terminals of the signal isolator (21) and the active isolation relay (22) are connected to the signal output terminals of the upstream control system, and the signal output terminals of the signal isolator (21) and the active isolation relay (22) are connected to the signal input terminals of the terminal unit (35).

4. The priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant as described in claim 1, characterized in that, The priority drive chassis (3) is also equipped with a management card (32), which is connected to each priority control module (33) via the chassis back panel and cascaded with each priority drive chassis (3) via fiber optic patch cords.

5. The priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant as described in claim 4, characterized in that, The signal transmission device (2) is also equipped with an optical fiber communication module. In the priority drive chassis (3) of each level, the signal output terminal of the management card (32) of one of the priority drive chassis (3) is connected to the signal input terminal of the optical fiber communication module. The signal output terminal of the optical fiber communication module is connected to the signal input terminal of the upstream control system so as to output the feedback signal of the controlled device to the upstream control system.

6. The priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant as described in claim 5, characterized in that, The optical fiber communication module consists of a splitter (23), a protocol conversion module (24), and an optical fiber terminal box (25). The signal output terminal of the management card (32) is connected to the signal input terminal of the splitter (23). The first signal output terminal of the splitter (23) is connected to the signal input terminal of the protocol conversion module (24). The second signal output terminal of the splitter (23) is connected to the first signal input terminal of the optical fiber terminal box (25). The signal output terminal of the protocol conversion module (24) is connected to the second signal input terminal of the optical fiber terminal box (25).

7. The priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant as described in claim 1, characterized in that, The device drive (4) has two outputs, one of which is equipped with a drive terminal (42) and the other is equipped with a solid-state relay (41).

8. The priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant as described in claim 1, characterized in that, The cabinet power supply device (1) consists of an in-cabinet power supply module (11), a drive power supply module (12), and a control circuit breaker (13). The priority drive chassis (3) is also equipped with a power supply card (31). The in-cabinet power supply module (11) is electrically connected to the power supply card (31) via the control circuit breaker. The drive power supply module (12) is electrically connected to the equipment drive device (4).

9. The priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant as described in claim 1, characterized in that, Each of the priority drive chassis (3) is equipped with a cooling fan (51).

10. The priority selection drive cabinet for a safety-grade instrumentation and control system in a nuclear power plant as described in claim 9, characterized in that, It also includes a status monitoring device and a cabinet status light (55). The status monitoring device consists of a temperature monitoring module (52), a power monitoring module (53), and a cooling fan (51) monitoring module configured in the corresponding position of the cabinet. The temperature monitoring module (52), the power monitoring module (53), and the fan monitoring module are all electrically connected to the cabinet status light (55).

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