Nuclear power station DCS system channel signal simulation device and inspection device

Abstract

The utility model relates to the technical field of nuclear power station equipment, and especially relates to a nuclear power station DCS system channel signal simulation device and a nuclear power station DCS system channel signal inspection device. The utility model discloses a nuclear power station DCS system channel signal simulation device. The signal simulation device comprises a programmable controller, a signal generator socket and at least two types of signal generators, the signal generator socket is a detachable quick interface and comprises a plurality of hard wires, and the signal generator socket is respectively connected with the at least two types of signal generators and the programmable controller through the plurality of hard wires. A plurality of signal generators are controlled by using a programmable controller, and various signal types are simulated. The programmable controller is used for executing the automatic locking signal and the analog signal, calculating the test result and releasing the locking signal, and then the next channel test is executed in sequence. Therefore, the DCS channel signal precision verification time is shortened, human errors can be avoided, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant equipment, in particular to a channel signal simulation device and an inspection device for a DCS system of a nuclear power plant. Background Art

[0002] For the channel accuracy of the DCS system of a nuclear power plant, it is necessary to check and confirm both in the commissioning stage and the daily operation stage to prevent factors such as card aging from causing the accuracy not to meet the design requirements and affecting the safety and reliability of the unit operation.

[0003] Taking the safety-grade DCS system of domestic third-generation EPR units as an example, there are a total of 1,089 input channels. The traditional channel accuracy detection method is as follows: 1. Block the channel in the downstream logic to prevent equipment misoperation during the test; 2. Inject a standard signal at the front end of the signal modulation equipment; 3. Record the measured value on the DCS, calculate the deviation, and compare it with the standard; 4. Release the block in the logic and restore the sensor channel to be available. On average, it takes 20 minutes to conduct a test for each channel. The disadvantage of the original method is that it takes too long, and each channel needs to be blocked and unblocked in the DCS, which is extremely prone to human error. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is how to reduce the occurrence of human error. Aiming at the defects of the prior art, a channel accuracy inspection device for a DCS system of a nuclear power plant is provided.

[0005] The technical solution adopted by the utility model to solve its technical problem is: a channel signal simulation device for a DCS system of a nuclear power plant, the channel signal simulation device includes: a programmable controller, a signal generator socket, and at least two types of signal generators; the at least two types of signal generator sockets are detachable quick interfaces, including a number of hard wires, and the signal generator sockets are respectively connected to the at least two types of signal generators and the programmable controller through the number of hard wires.

[0006] Preferably, the at least two types of signal generators include:

[0007] At least two of a thermal resistance signal simulator, a thermocouple signal simulator, a pulse signal generator, an analog quantity signal generator, and a digital quantity signal generator.

[0008] Preferably, the at least two types of signal generators are connected to the programmable controller through a bus.

[0009] Preferably, the at least two types of signal generators perform data interaction with the programmable controller through a serial communication protocol.

[0010] Preferably, the inspection device further includes: a pin connector; the input ends of the pin connector are respectively connected to the at least two types of signal generators.

[0011] Preferably, the pin connector is the same as the front connector of the DCS system panel.

[0012] Preferably, the signal simulation device further includes: a data interface; the data interface is connected to the programmable controller; the data interface is used for the programmable controller to receive external instructions.

[0013] Preferably, the data interface includes a network connection interface; the network connection interface is used for connecting the programmable controller to the Ethernet and receiving Ethernet instructions.

[0014] This application also provides a device for inspecting the signal accuracy of a DCS system in a nuclear power plant, including the signal simulation device as described above.

[0015] Preferably, the inspection device further includes an external display; the external display is connected to the signal simulation device; the external display is used for displaying the simulation value of the signal simulation device and the feedback value of the DCS system.

[0016] Implementing the present utility model has the following beneficial effects:

[0017] The present utility model includes a programmable controller, a signal generator socket, and at least two types of signal generators. By using the programmable controller to control multiple signal generators, various signal types are simulated. The programmable controller is used to execute an automatic lock signal, simulate signals, calculate test results, release the lock signal, and then sequentially execute the next channel test. Thereby, the time for verifying the signal accuracy of the DCS system channels is shortened, and human error can be avoided, greatly improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0019] Figure 1 It is a schematic diagram of the simulation device in an embodiment;

[0020] Figure 2 It is a working principle diagram of the simulation device in an embodiment;

[0021] Figure 3 It is a communication diagram of the programmable controller and the signal generator in an embodiment;

[0022] Figure 4 It is a schematic diagram of the signal receiving card in the DCS system cabinet in an embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific implementation manners of the present utility model will now be described in detail with reference to the accompanying drawings.

[0024] A component is referred to as being "fixed to" or "disposed on" another component, and it can be directly or indirectly located on that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component.

[0025] The orientations or positions indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positions shown in the accompanying drawings.

[0026] The terms "axial direction" and "radial direction" take the length direction of the entire device or component as the "axial direction", and the direction perpendicular to the axial direction as the "radial direction".

[0027] The terms "first", "second", etc. are only used for the purpose of facilitating description and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0028] The above terms are only for the convenience of description and cannot be construed as limiting the technical solution of the present application.

[0029] A channel signal simulation device for a nuclear power plant DCS system provided by an embodiment of the present utility model.

[0030] In a feasible embodiment, as Figure 1 shown, the signal simulation device includes: a programmable logic controller 10, a signal generator socket 11, and at least two types of signal generators 12; the signal generator socket 11 is a detachable quick interface, including a plurality of hardwired connections, and the signal generator socket 11 is respectively connected to at least two types of signal generators 12 and the programmable logic controller through the plurality of hardwired connections.

[0031] In this embodiment, the programmable logic controller 10 is used to control the signal generator, and the signal generator is commanded to send a simulation signal of the DCS system channel signal. Then, the simulation signal is transmitted to the DCS cabinet through the signal generator socket 11. It should be noted that nuclear power plants have a large amount of high-frequency electromagnetic interference, which belongs to a harsh working environment for electronic products, and the programmable logic controller 10 can work continuously and reliably in this environment for a long time. Therefore, the signal simulation device in the present application can adapt to the working environment of nuclear power plants by using the programmable logic controller 10.

[0032] Meanwhile, this application can improve the reliability of the signal simulation device. Secondly, the programmable logic controller 10 is easy to use and simple to program. It adopts programming languages such as concise ladder diagrams, logic diagrams or statement lists without the need for computer knowledge. Therefore, the system development cycle is short and on-site debugging is easy. In addition, the programmable logic controller 10 can modify the program online and change the control scheme without removing the hardware. By connecting the programmable logic controller 10, this application improves the flexibility of the simulation signal, enables the simulation signal sent by the signal simulation device to quickly match the requirements of the channel signal, and improves the simulation efficiency and accuracy.

[0033] It should be noted that the signal generator is a very critical device in the field of electronic testing and measurement. It can provide electrical signals with various frequencies, waveforms and output levels. Usually, it can be classified according to working evaluation, frequency generation mechanism, output power, generated signal type and capabilities. And at least two types of signal generators 12 have multiple types of signal generators, and each type of signal generator includes at least one such signal generator.

[0034] In some feasible embodiments, the types of at least two types of signal generators 12 can be defined according to the differences between the signals to be simulated. When selecting at least two types of signal generators 12, the corresponding types and performances of signal generators should be selected according to the specific characteristics and requirements of the DCS system channel signals to ensure the accuracy and reliability of the test results. Usually, the signal generators in at least two types of signal generators 12 are classified by the generated signal type.

[0035] In some other feasible embodiments, this application can also write the inspection process into the programmable logic controller 10 in a software programming manner, so as to avoid human-induced mistakes and time losses in the generated simulation signal, switched simulation signal and switch lock, and greatly improve work efficiency and production reliability.

[0036] In addition, in some feasible embodiments, the number of signal generator sockets 11 is determined according to the number of signal generators in at least two types of signal generators 12. The number of signal generator sockets 11 should be greater than or equal to the number of signal transmitters.

[0037] Specifically, the signal generator socket 11 can be a signal generator matrix capable of inserting at least two types of signal generators 12. The number of sockets of the signal generator socket 11 can be expanded.

[0038] Secondly, in some executable embodiments, the signal generator socket 11 can be composed of multiple sub-sockets, and each sub-socket can be connected to one signal generator among at least two types of signal generators 12. Meanwhile, according to the types and connection requirements of the signal generators, there can be multiple types of the signal generator socket 11. It is specifically determined according to the access type of the signal generator and will not be limited herein.

[0039] In an executable embodiment, at least two types of signal generators 12 include at least two of a thermal resistance signal simulator, a thermocouple signal simulator, a pulse signal generator, an analog quantity signal generator, and a digital quantity signal generator.

[0040] Specifically, the thermal resistance signal simulator is used to simulate temperature signals; the thermocouple signal is used to simulate the signals of the thermocouples collected by the DCS system; the pulse signal generator is used to simulate the rotational speed signals collected by the DCS system; the analog quantity signal generator is used to simulate the signals output by the transmitters collected by the DCS system; and the digital quantity signal generator is used to simulate the digital quantity signals collected by the DCS system. This application can meet the requirements of the DCS system for signal types through the free combination of the above-mentioned multiple signal generators, making the types of simulation signals more perfect, and at the same time being able to avoid unnecessary signal generators.

[0041] In an executable embodiment, at least two types of signal generators are connected to the programmable controller 10 through a bus.

[0042] Specifically, the signal generator is plugged into the signal generator socket 11 and then connected to the programmable controller 10 through a bus. Through the bus connection, high-speed data transmission between at least two types of signal generators 12 and the programmable controller 10 can be achieved, enabling real-time control and signal generation, and improving the reliability of data transmission. At the same time, the reconfigurability of the signal generator enables this application to adjust the logic according to needs to adapt to different application requirements, increasing the applicability and flexibility of the signal simulation device, and better meeting the channel signal requirements of the nuclear power plant DCS system. In addition, the bus system usually has the ability of error detection and correction, which can improve the reliability of the signal simulation device.

[0043] As Figure 2 shown, in an executable embodiment, the signal simulation device includes a programmable controller 10, and the programmable controller 10 is connected to the signal generator among at least two types of signal generators 12 through a bus (BUS). The programmable controller 10 receives the signals from the DCS server through Ethernet, and controls the signal generator to output the signal types required for simulation according to the test requirements. The DCS cabinet receives the simulation signals sent by the signal generator and transmits the processed information to the DCS server through Ethernet and / or the DCS network.

[0044] In some other executable embodiments, other devices are added to the signal simulation device of the present application to form a new device. At this time, the state of an external display may exist. Through bus connection, the user can remotely control the parameter settings of the signal simulation device, such as frequency adjustment, phase adjustment, etc., improving the convenience of operation. It can also provide real-time feedback on the current working state and parameters, facilitating user monitoring and adjustment.

[0045] In some other feasible embodiments, the design of the bus can also make future expansion or upgrade easier. At the same time, due to this scalability, the compatibility of the signal simulation device is also improved.

[0046] In a feasible embodiment, at least two types of signal generators 12 perform data interaction with the programmable controller 10 through a serial communication protocol.

[0047] Specifically, compared with parallel communication, the significant feature of serial communication is that it reduces the occupation of pin resources, reduces the number of required wiring, simplifies the design of the communication interface, and also reduces the complexity of the interface and the corresponding hardware cost.

[0048] According to the different data transmission directions, serial communication can be divided into three forms: simplex, half-duplex, and full-duplex. Among them, the full-duplex mode allows data to be transmitted simultaneously in two directions, which is suitable for application scenarios that require high-speed data exchange. The serial communication protocol supports multiple communication methods and can be flexibly selected according to the simulation requirements of the DCS system communication signal to adapt to different application scenarios. At the same time, the configuration and debugging of serial communication are relatively simple, easy to implement and maintain, reducing the complexity and cost of technical support.

[0049] In some other executable embodiments, the serial communication standard is determined according to the usage environment of the present application. For example, a serial communication standard using a differential standard is adopted to provide better anti-interference performance. Specifically, the serial communication standard changes according to the environment and is not limited here.

[0050] In some other executable embodiments, as Figure 3 shown, a Modbus communication protocol is adopted between the programmable controller 10 and at least two types of signal generators 12. Among them, at least two types of signal generators 12 include: a thermal resistance signal simulator, a thermocouple signal simulator, a pulse signal generator, an analog quantity signal generator, and a digital quantity signal generator. The programmable controller 10 receives an upstream instruction and sends commands to the thermal resistance signal simulator, the thermocouple signal simulator, the pulse signal generator, the analog quantity signal generator, and the digital quantity signal generator through Modbus communication. The thermal resistance signal simulator, the thermocouple signal simulator, the pulse signal generator, the analog quantity signal generator, and the digital quantity signal generator perform signal simulation and analog according to the commands.

[0051] In some executable embodiments, the signal generator is hard-wired to the DCS cabinet, and the calculated signals are collected by the DCS server. In the DCS server, the sequence control logic software is written through software and sent to the programmable controller 10. The programmable controller 10 is used to implement automatic locking signals, analog signals, calculate test results, release locking signals, then sequentially execute the next channel test, and finally print out the test report.

[0052] In an executable embodiment, the signal simulation device further includes: a pin connector. The input end of the pin connector is connected to at least two types of signal generators 12.

[0053] Specifically, the pin connector is connected to at least two types of signal generators 12 through the signal generator socket 11. The signal generators in at least two types of signal generators 12 are all inserted into the signal generator socket 11. The signal generator socket 11 is connected to the pin connector. The analog signals generated by the signal generators are transmitted to the pin connector through the signal generator socket 11, and then connected to the DCS cabinet through the pin connector, and at the same time, the simulation signals are output to the DCS system. The metal pins and slots of the pin connector ensure the stability and reliability of the electrical connection, reducing the risk of connection failure. Also, the pin connector can be quickly disconnected and reconnected, simplifying the maintenance process.

[0054] Furthermore, the manufacturing cost of the pin connector is relatively low, and due to its reliability and ease of maintenance, the overall usage cost can be reduced. At the same time, the operation of the pin connector is very simple, and users can easily learn its operation, thereby reducing the possibility of operation errors and improving work efficiency.

[0055] In an executable embodiment, the pin connector is the same as the front-mounted connector of the DCS system panel.

[0056] By using the same connector standard, it can be ensured that each connection point on the panel can be seamlessly docked with this application, thus simplifying the integration process of the entire system. In addition, the standardized connector reduces errors caused by interface mismatches during installation, speeds up the configuration speed, and reduces the need for technical support.

[0057] As Figure 4 shown, in some executable embodiments, the front-mounted connector of the DCS system panel is an 8-pin connector. The matching common connector is the interface of the model MC 1,5 / 8-STF-3,81 of Phonix Company. Therefore, the pin connector used in this embodiment is an 8-pin connector.

[0058] However, when facing different pin connectors provided by the front panels of different DCS systems and different common connectors, the pin connector of the present application will change along with the provided pin connector or common connector.

[0059] In a feasible embodiment, the signal simulation device further includes: a data interface; the data interface is connected to the programmable controller 10; the data interface is used for the programmable controller 10 to receive external instructions.

[0060] The data interface not only improves the reliability of communication and the flexibility of the system, but also enhances the data processing ability, simplifies the integration of the signal simulation device, supports remote control and monitoring, promotes information transparency, and reduces the requirements for the signal simulation device. By making full use of the advantages of the data interface, the efficient operation of the automation system can be ensured, and the requirements for simulating the communication signals of the DCS system can be met. When selecting and using the data interface, the compatibility between the data interface and the programmable controller 10 and the required functional characteristics should be considered to ensure the best system performance and long-term stable operation.

[0061] In some executable embodiments, in order to adapt to the requirements of different DCS system communication signals in nuclear power plants and the differences in the environments where DCS cabinets are located, the data interface can be a traditional serial port, an Ethernet interface, or a more advanced wireless communication interface such as Wi-Fi or Bluetooth. These data interfaces improve the interoperability between the signal simulation device and the DCS system and the DCS cabinet.

[0062] In some executable embodiments, the data interface can incorporate algorithms to optimize the received data, filter out noise and outliers, ensure that the data transmitted to the programmable controller 10 is accurate and reliable, and thus improve the stability and performance of the entire signal simulation device.

[0063] In a feasible embodiment, the data interface includes a network connection interface; the network connection interface is used to connect the programmable controller 10 to the Ethernet and receive Ethernet instructions.

[0064] Specifically, the support of the data interface enables the programmable controller 10 to implement remote monitoring and control functions. Operators can access the programmable controller 10 through the network for system debugging, parameter setting, and maintenance, and issue simulation instructions without having to be on-site.

[0065] In some executable embodiments, in order to protect the security of data transmission, the data interface can support data encryption and user authentication mechanisms to prevent unauthorized access and data leakage and ensure the security of the signal simulation device.

[0066] Furthermore, the data interface can adopt a dedicated security protocol, such as SFTP or TLS, which can further enhance the security of the data transmission process and protect the system from network attacks and threats.

[0067] This application also provides a device for checking the signal accuracy of the DCS system in a nuclear power plant.

[0068] In a feasible embodiment, the device for checking the signal accuracy of the DCS system in a nuclear power plant includes the signal simulation device as described above. Therefore, the checking device has all the functions and beneficial effects of the aforementioned simulation device.

[0069] For example, the checking device can automatically complete processes such as automatically locking signals, simulating signals, calculating test results, unlocking signals, and then sequentially performing the next channel test.

[0070] In some other feasible embodiments, the signal generators used by the checking device are as shown in the following table:

[0071]

[0072] In a feasible embodiment, the checking device further includes an external display; the external display is connected to the signal simulation device; the external display is used to display the simulation value of the signal simulation device and the feedback value of the DCS system.

[0073] This application can automatically enforce signals, simulate signals in program order, calculate channel accuracy, release the enforced signals, etc., which greatly improves work efficiency and avoids human errors.

[0074] The above embodiments only represent the preferred embodiments of the present utility model, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above technical features can be freely combined, and several deformations and improvements can also be made, all of which belong to the protection scope of the present utility model; therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. A channel signal simulation device for a nuclear power plant DCS system, characterized in that The signal simulation device includes: a programmable controller, a signal generator socket, and at least two types of signal generators; the signal generator socket is a detachable quick interface and includes a number of hard wires; the signal generator socket is respectively connected to the at least two types of signal generators and the programmable controller through the number of hard wires.

2. The signal simulation device according to claim 1, wherein The at least two types of signal generators include: a thermal resistance signal simulator, a thermocouple signal simulator; at least two of a pulse signal generator, an analog quantity signal generator, and a digital quantity signal generator.

3. The signal simulation device according to claim 2, wherein The at least two types of signal generators are connected to the programmable controller through a bus.

4. The signal simulation device according to claim 3, wherein, The at least two types of signal generators perform data interaction with the programmable controller through a serial communication protocol.

5. The signal simulation device according to claim 2, characterized in that It further includes: a pin connector; the input end of the pin connector is connected to the at least two types of signal generators.

6. The signal simulation device according to claim 5, wherein The pin connector is consistent with the front connector of the DCS system panel.

7. The signal simulation device according to claim 1, wherein The signal simulation device further includes: a data interface; the data interface is connected to the programmable controller; the data interface is used for the programmable controller to receive external instructions.

8. The signal simulation device according to claim 7, wherein The data interface includes a network connection interface; the network connection interface is used for connecting the programmable controller to an Ethernet and receiving Ethernet instructions.

9. A channel signal accuracy inspection device for a nuclear power plant DCS system, characterized in that, It includes the signal simulation device according to any one of claims 1 to 8.

10. The inspection device according to claim 9, characterized in that, The inspection device further includes an external display; the external display is connected to the signal simulation device; the external display is used for displaying the simulation value of the signal simulation device and the feedback value of the DCS system.

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