Nuclear reactor protection channel signal injection device

Abstract

The invention particularly relates to a nuclear reactor protection channel signal injection device. The device comprises a test host; the nuclear reactor protection system comprises a main control system and a protection channel, the test host is in network communication connection with the main control system and is used for receiving a protection channel variable value issued by the main control system in real time and judging whether the protection channel variable value is updated or not in real time; after it is judged that the variable value of the protection channel is updated, electrical signals of the corresponding type are generated and output to the corresponding protection channel so that the corresponding protection channel can reach the trigger condition of tripping, and meanwhile a trigger signal is generated and sent to the main control system; receiving a test instruction sent by the main control system, and synchronously collecting a trip signal of the protection channel; and calculating an edge change time difference between the test instruction and the trip signal to obtain a protection channel time response result. According to the invention, adaptation of different physical quantity signals is realized.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear reactor protection channel response time testing, in particular to a nuclear reactor protection channel signal injection device. Background Art

[0002] The nuclear reactor protection system generally adopts a nuclear-grade DCS system, which is connected to instruments or sensors at the upper end. It receives the physical signals sent back by the instruments or sensors in real time and performs logical processing. When the requirements of the logical combination are met, a protection action signal is given to drive the shutdown circuit breaker to operate and complete the protection function.

[0003] According to the safety standards of nuclear power plants, in order to ensure the confidence of the nuclear reactor protection system in achieving the expected protection function, the response time of its protection channel needs to be tested regularly. The response time test requires simulating the real protection logic trigger and measuring the time from signal injection to the control system generating action output to verify that the response time is within the limits given in the safety analysis report.

[0004] In order to meet the design requirements for the protection system response time, nuclear power plants need to conduct regular protection system response time test experiments. In the past, this experiment was done manually, requiring an external data recorder, a signal generator, and a large number of special cables to read data through the data recorder. The entire experiment required a lot of manpower and time capital, and there was also a human error trap of disconnecting and wiring errors.

[0005] Traditional time measurement devices need to find the starting signal of the signal change, and usually use one of the two poles of the relay to control it. Due to the characteristics of the relay itself, the two poles are not switched synchronously, and as time goes by, the time will change, resulting in uncertainty in the measurement results.

[0006] In view of this, it is necessary to develop a protection channel signal injection device with controllable trigger signal to achieve different delay threshold configurations, adapt to the output of different characteristic signals, and obtain more accurate time values, thereby greatly improving the test accuracy. Summary of the invention

[0007] The object of the present invention is to provide a nuclear reactor protection channel signal injection device to achieve the adaptation of different physical quantity signals.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A nuclear reactor protection channel signal injection device includes a test host; a nuclear reactor protection system includes a main control system and a protection channel;

[0010] The test host is connected to the main control system through network communication, and is used to receive the protection channel variable values ​​issued by the main control system in real time and determine whether the protection channel variable values ​​are updated in real time; after determining that the protection channel variable values ​​are updated, generate the corresponding type of electrical signal and output it to the corresponding protection channel so that the corresponding protection channel reaches the trigger condition for tripping, and generate a trigger signal to send to the main control system; receive the test instructions sent by the main control system, and synchronously collect the tripping signal of the protection channel; calculate the time difference between the test instructions and the tripping signal, and obtain the protection channel time response result.

[0011] As one of the achievable methods, the test host includes an embedded host, an electrical signal generating module, a triggering module and a multi-channel acquisition module;

[0012] The embedded host is connected to the main control system through a network communication, and is used to receive the protection channel variable value sent by the main control system in real time and determine in real time whether the protection channel variable value is updated; after determining that the protection channel variable value is updated, the electrical signal generation module is controlled to generate an electrical signal of the corresponding type and output it to the corresponding protection channel so that the corresponding protection channel reaches the trigger condition for tripping, and at the same time, the trigger module is controlled to generate a trigger signal and send it to the main control system; the test instruction sent by the main control system is received, and the multi-channel acquisition module is controlled to synchronously acquire the tripping signal of the protection channel; the time difference between the test instruction and the tripping signal is calculated to obtain the time response result of the protection channel.

[0013] As one of the achievable methods, the embedded host locally stores the protection channel variable value; the embedded host determines whether the protection channel variable value is updated, including the following steps:

[0014] The embedded host compares the protection channel variable value sent by the main control system with the protection channel variable value stored locally;

[0015] If the protection channel variable value sent by the main control system is different from the protection channel variable value stored locally in the embedded host, it is determined that the protection channel variable value is updated.

[0016] As one of the achievable methods, the electrical signal generation module includes an analog pulse signal generation module, a digital pulse signal generation module, a current signal generation module and an RTD signal generation module; the protection channel includes an analog pulse signal protection channel, a digital pulse signal protection channel, a current signal protection channel and an RTD signal protection channel; the test host also includes a single-chip microcomputer;

[0017] The embedded host is connected to the analog pulse signal generation module and the digital pulse signal generation module through network communication respectively; the embedded host controls the analog pulse signal generation module to generate an analog pulse signal and outputs it to the analog pulse signal protection channel; the embedded host controls the digital pulse signal generation module to generate a digital pulse signal and outputs it to the digital pulse signal protection channel;

[0018] The embedded host is connected to the current signal generating module and the RTD signal generating module through the single-chip microcomputer respectively; the embedded host controls the single-chip microcomputer through the serial port to control the current signal generating module to generate a current signal output to the current signal protection channel, and the embedded host controls the single-chip microcomputer through the serial port to control the RTD signal generating module to generate an RTD signal output to the RTD signal protection channel;

[0019] Analog pulse signals, digital pulse signals, current signals and RTD signals are all prefabricated conditions, which are output to the corresponding protection channel to enable the corresponding protection channel to reach the trigger condition for tripping; when the trigger signal is a certain protection channel as the trigger source, the mark signal is output synchronously with the change of the trigger source, marking the change time of the signal of the input protection channel and the time when the signal completes the change.

[0020] As one of the feasible ways, the embedded host is connected to the control system via an aviation plug to realize power supply control; the embedded host communicates with the main control system via the aviation plug through CAN, and a CAN protocol conversion chip is set between the embedded host and the main control system for conversion between DTL protocol and CAN protocol.

[0021] As one of the feasible ways, the CAN protocol conversion chip is a CSM300A chip.

[0022] As one possible implementation, the trigger module includes a first trigger signal generating unit and a second trigger signal generating unit;

[0023] Wherein, the first trigger signal generating unit is used for the embedded host to generate a trigger signal to upload to the main control system when determining that the RTD signal, digital pulse signal or analog pulse signal sent by the main control system is updated;

[0024] The second trigger signal generating unit is used to generate a trigger signal to upload to the main control system when the embedded host determines that the current signal is updated.

[0025] As one of the feasible ways, the embedded host includes FPGA; the digital pulse signal generation module includes DIO chip and the first isolation chip; the main control system sends the digital pulse signal to FPGA through network communication, and after the FPGA parses the variables, it controls the DIO chip to send the TTL signal to the first isolation chip, and the first isolation chip converts the TTL signal into RS422 signal and outputs it to the digital pulse signal protection channel.

[0026] As one of the feasible methods, the analog pulse signal generation module includes a high-speed DAC, an AO chip and a second isolation chip; the FPGA controls the AO chip to output a digital pulse signal to the high-speed DAC, the high-speed DAC converts the digital pulse signal into an analog pulse signal and outputs it to the second isolation chip, the second isolation chip isolates the analog pulse signal and outputs it to the analog pulse signal protection channel; the high-speed DAC controls the clock to 50Mz and the update rate to 50K.

[0027] As one of the feasible ways, the current signal generation module includes a low-speed DAC, an SPI-DAC and a space-time DAC; the single-chip microcomputer outputs a (0-5)V voltage signal to the low-speed DAC through the SPI-DAC according to the test instruction of the main control system, and the low-speed DAC converts the (0-5)V voltage signal into a (0-20)mA current signal and outputs it to the space-time DAC, and the space-time DAC converts the (0-20)mA current signal into an LDAC signal and outputs it to the protection channel, thereby realizing the synchronous output of multiple DACs; the update frequency of the low-speed DAC is 10Hz.

[0028] As one of the feasible ways, the RTD signal generation module includes a resistor network and a relay; the embedded host controls the single-chip microcomputer through the serial port, and the single-chip microcomputer controls the precision resistor network and the relay to switch and output the required RTD signal according to the test instructions of the main control system.

[0029] As one of the feasible ways, the trigger module includes two counters; FPGA controls the two counters to record the moment when the protection channel signal changes and the moment when the signal completes the change; the trigger signal marks the beginning of the change of the protection channel signal; wherein, the synchronous trigger generation corresponding to the RTD signal, digital pulse signal, and analog pulse signal output is all controlled by FPGA, and another DO of FPGA is used to mark the change of each channel quantity; the synchronous trigger signal corresponding to the current signal is generated by FPGA by controlling the synchronous output port of the low-speed DAC to mark the moment when the DAC is updated.

[0030] As one of the feasible ways, the single chip microcomputer is an STM32 chip.

[0031] As one of the feasible ways, the protection channel signal injection device also includes a display screen, which is communicatively connected with the single-chip computer, and is used to respectively acquire the current signal output by the current signal generating module and the thermal resistance signal output by the thermal resistance signal generating module in real time and display them in real time respectively, so as to view the current value of each protection channel of the nuclear reactor protection system in real time.

[0032] As one of the possible implementations, the display screen is an OLED display screen.

[0033] Beneficial technical effects of the present invention:

[0034] The protection channel signal injection device of the present invention provides a corresponding electrical signal for the protection channel according to the test instruction of the main control system, realizes the adaptation of various existing DCS systems, realizes the configuration of different delay thresholds according to different working conditions, adapts the output of different electrical signals, avoids the manual preparation of signal generators and a large number of special cables, and avoids human errors; analyzes the time difference between the edge change of the trigger signal and each trip signal through an algorithm, thereby obtaining a more accurate time value, greatly improving the test accuracy, and avoiding the result uncertainty caused by the relay in the traditional measurement method; by automatically injecting the test signal and synchronously outputting the trigger signal, a trigger condition is provided for subsequent acquisition, and the test result acquisition and the automatic test of various working conditions are realized, thereby avoiding the consumption of a large amount of human capital and time capital. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of an embodiment of a protection channel signal injection device of the present invention;

[0036] Figure 2 A circuit diagram of an embodiment of a protection channel signal injection device of the present invention;

[0037] Figure 3 A schematic diagram of the structure of an embodiment of an RTD signal generating module. DETAILED DESCRIPTION

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0039] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0041] See also Figure 1-2 , This embodiment provides a nuclear reactor protection channel signal injection device, including a test host; the nuclear reactor protection system includes a main control system and a protection channel;

[0042] The test host is connected to the main control system through network communication, and is used to receive the protection channel variable values ​​issued by the main control system in real time and determine whether the protection channel variable values ​​are updated in real time; after determining that the protection channel variable values ​​are updated, generate the corresponding type of electrical signal and output it to the corresponding protection channel so that the corresponding protection channel reaches the trigger condition for tripping, and generate a trigger signal to send to the main control system; receive the test instructions sent by the main control system, and synchronously collect the tripping signal of the protection channel; calculate the time difference between the test instructions and the tripping signal, and obtain the protection channel time response result.

[0043] In this embodiment, as one of the achievable methods, the test host includes an embedded host, an electrical signal generating module, a trigger module and a multi-channel acquisition module;

[0044] The embedded host is connected to the main control system through a network communication, and is used to receive the protection channel variable value sent by the main control system in real time and determine in real time whether the protection channel variable value is updated; after determining that the protection channel variable value is updated, the electrical signal generation module is controlled to generate an electrical signal of the corresponding type and output it to the corresponding protection channel so that the corresponding protection channel reaches the trigger condition for tripping, and at the same time, the trigger module is controlled to generate a trigger signal and send it to the main control system; the test instruction sent by the main control system is received, and the multi-channel acquisition module is controlled to synchronously acquire the tripping signal of the protection channel; the time difference between the test instruction and the tripping signal is calculated to obtain the time response result of the protection channel.

[0045] In this embodiment, as one of the achievable methods, the embedded host locally stores the protection channel variable value; the embedded host determines whether the protection channel variable value is updated, including the following steps:

[0046] The embedded host compares the protection channel variable value sent by the main control system with the protection channel variable value stored locally;

[0047] If the protection channel variable value sent by the main control system is different from the protection channel variable value stored locally in the embedded host, it is determined that the protection channel variable value is updated.

[0048] In this embodiment, as one of the achievable methods, the electrical signal generating module includes an analog pulse signal generating module, a digital pulse signal generating module, a current signal generating module and an RTD signal generating module; the protection channel includes an analog pulse signal protection channel, a digital pulse signal protection channel, a current signal protection channel and an RTD signal protection channel; the test host also includes a single-chip microcomputer;

[0049] The embedded host is connected to the analog pulse signal generation module and the digital pulse signal generation module through network communication respectively; the embedded host controls the analog pulse signal generation module to generate an analog pulse signal and outputs it to the analog pulse signal protection channel; the embedded host controls the digital pulse signal generation module to generate a digital pulse signal and outputs it to the digital pulse signal protection channel;

[0050] The embedded host is connected to the current signal generating module and the RTD signal generating module through the single-chip microcomputer respectively; the embedded host controls the single-chip microcomputer through the serial port to control the current signal generating module to generate a current signal output to the current signal protection channel, and the embedded host controls the single-chip microcomputer through the serial port to control the RTD signal generating module to generate an RTD signal output to the RTD signal protection channel;

[0051] Analog pulse signals, digital pulse signals, current signals and RTD signals are all prefabricated conditions, which are output to the corresponding protection channels to enable the corresponding protection channels to reach the triggering conditions for tripping;

[0052] When the trigger signal is a certain protection channel as the trigger source, the marker signal is output synchronously with the change of the trigger source, marking the change moment of the signal input to the protection channel and the moment when the signal completes the change;

[0053] During each test, the protection channel signal injection device selects to output a type of electrical signal according to each test instruction, and generates a corresponding trigger signal through the coordination of a specific circuit according to the corresponding type of electrical signal, thereby ensuring measurement accuracy while realizing automated testing of various working conditions.

[0054] In this embodiment, as one of the feasible ways, the embedded host and the main control system are connected through the CAN bus protocol for network communication, and the embedded host receives the protection channel variable value sent by the main control system through the CAN bus protocol.

[0055] In this embodiment, as one of the achievable methods, the embedded host is connected to the control system via an aviation plug to realize power supply control;

[0056] The embedded host communicates with the main control system via the aviation plug through CAN. Since the embedded host does not support direct processing of the CAN protocol, a CAN protocol conversion chip is set between the embedded host and the main control system for conversion between the DTL protocol and the CAN protocol.

[0057] The embedded host is connected to the main control system via an aviation plug to feedback a trigger signal to the main control system.

[0058] In this embodiment, as one of the implementable ways, the CAN protocol conversion chip is a CSM300A chip.

[0059] In this embodiment, as one of the implementable ways, the trigger module includes a first trigger signal generating unit and a second trigger signal generating unit;

[0060] Wherein, the first trigger signal generating unit is used for the embedded host to generate a trigger signal to upload to the main control system when determining that the RTD signal, digital pulse signal or analog pulse signal sent by the main control system is updated;

[0061] The second trigger signal generating unit is used to generate a trigger signal to upload to the main control system when the embedded host determines that the current signal is updated.

[0062] In this embodiment, as one of the feasible methods, the embedded host includes FPGA; the digital pulse signal generation module includes a DIO chip and a first isolation chip; the main control system sends the digital pulse signal to the FPGA through network communication, and after the FPGA parses the variables, it controls the DIO chip to send a TTL signal to the first isolation chip, and the first isolation chip converts the TTL signal into an RS422 signal and outputs it to the digital pulse signal protection channel.

[0063] In this embodiment, as one of the feasible methods, the analog pulse signal generation module includes a high-speed DAC, an AO chip and a second isolation chip; the FPGA controls the AO chip to output a digital pulse signal to the high-speed DAC, the high-speed DAC converts the digital pulse signal into an analog pulse signal and outputs it to the second isolation chip, the second isolation chip isolates the analog pulse signal and outputs it to the analog pulse signal protection channel; the high-speed DAC controls the clock to 50Mz and the update rate to 50K.

[0064] In this embodiment, as one of the feasible methods, the current signal generating module includes a low-speed DAC, an SPI-DAC and a space-time DAC; the single-chip microcomputer outputs a (0-5)V voltage signal to the low-speed DAC through the SPI-DAC according to the test instruction of the main control system, and the low-speed DAC converts the (0-5)V voltage signal into a (0-20)mA current signal and outputs it to the space-time DAC, and the space-time DAC converts the (0-20)mA current signal into an LDAC signal and outputs it to the protection channel, thereby realizing the synchronous output of multiple DACs; the update frequency of the low-speed DAC is 10Hz.

[0065] See also Figure 3 In this embodiment, as one of the feasible methods, the RTD signal generating module includes a resistor network and a relay; the embedded host controls the single-chip microcomputer through the serial port, and the single-chip microcomputer controls the precision resistor network and the relay to switch and output the required RTD signal according to the test instructions of the main control system.

[0066] In this embodiment, as one of the feasible methods, the trigger module includes two counters; the FPGA controls the two counters to record the moment when the protection channel signal changes and the moment when the signal completes the change; the trigger signal marks the beginning of the change of the protection channel signal; wherein, the synchronous trigger generation corresponding to the RTD signal, digital pulse signal, and analog pulse signal output is controlled by the FPGA, and another DO of the FPGA is used to mark the changes in each channel quantity; the synchronous trigger signal corresponding to the current signal is generated by the FPGA by controlling the synchronous output port of the low-speed DAC to mark the moment when the DAC is updated.

[0067] In this embodiment, as one of the achievable ways, the single chip microcomputer is an STM32 chip.

[0068] In this embodiment, as one of the feasible methods, the protection channel signal injection device also includes a display screen, which is communicatively connected to the single-chip computer, and is used to respectively acquire the current signal output by the current signal generating module and the thermal resistance signal output by the thermal resistance signal generating module in real time and display them in real time respectively, so as to view the current value of each protection channel of the nuclear reactor protection system in real time.

[0069] In this embodiment, as one of the achievable ways, the display screen is an OLED display screen.

[0070] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A nuclear reactor protection channel signal injection device, wherein: The nuclear reactor protection system includes a main control system and a protection channel; and is characterized in that it includes a test host; The test host is connected to the main control system through network communication, and is used to receive the protection channel variable values ​​issued by the main control system in real time and determine whether the protection channel variable values ​​are updated in real time; after determining that the protection channel variable values ​​are updated, generate the corresponding type of electrical signal and output it to the corresponding protection channel so that the corresponding protection channel reaches the trigger condition for tripping, and generate a trigger signal to send to the main control system; receive the test instructions sent by the main control system, and synchronously collect the tripping signal of the protection channel; calculate the time difference between the test instructions and the tripping signal, and obtain the protection channel time response result.

2. The nuclear reactor protection channel signal injection device according to claim 1, characterized in that: The test host includes an embedded host, an electrical signal generating module and a triggering module; The embedded host is connected to the main control system through a network communication, and is used to receive the protection channel variable value sent by the main control system in real time and determine in real time whether the protection channel variable value is updated; After determining that the protection channel variable value is updated, the electrical signal generation module is controlled to generate an electrical signal of the corresponding type and output it to the corresponding protection channel so that the corresponding protection channel reaches the trigger condition for tripping. At the same time, the trigger module is controlled to generate a trigger signal and send it to the main control system; the test instruction sent by the main control system is received, and the tripping signal of the protection channel is synchronously collected; the time difference between the test instruction and the tripping signal is calculated to obtain the protection channel time response result.

3. The nuclear reactor protection channel signal injection device according to claim 2, characterized in that: The embedded host local storage protects the channel variable value; The embedded host determines whether the protection channel variable value is updated, including the following steps: The embedded host compares the protection channel variable value sent by the main control system with the protection channel variable value stored locally; If the protection channel variable value sent by the main control system is different from the protection channel variable value stored locally in the embedded host, it is determined that the protection channel variable value is updated.

4. The nuclear reactor protection channel signal injection device according to claim 2, characterized in that: The electrical signal generation module includes an analog pulse signal generation module, a digital pulse signal generation module, a current signal generation module and an RTD signal generation module; the protection channel includes an analog pulse signal protection channel, a digital pulse signal protection channel, a current signal protection channel and an RTD signal protection channel; the test host also includes a single-chip microcomputer; The embedded host is connected to the analog pulse signal generation module and the digital pulse signal generation module through network communication respectively; the embedded host controls the analog pulse signal generation module to generate an analog pulse signal and outputs it to the analog pulse signal protection channel; the embedded host controls the digital pulse signal generation module to generate a digital pulse signal and outputs it to the digital pulse signal protection channel; The embedded host is connected to the current signal generating module and the RTD signal generating module through the single-chip microcomputer respectively; the embedded host controls the single-chip microcomputer through the serial port to control the current signal generating module to generate a current signal output to the current signal protection channel, and the embedded host controls the single-chip microcomputer through the serial port to control the RTD signal generating module to generate an RTD signal output to the RTD signal protection channel; Analog pulse signals, digital pulse signals, current signals and RTD signals are all prefabricated conditions, which are output to the corresponding protection channel to enable the corresponding protection channel to reach the trigger condition for tripping; when the trigger signal is a certain protection channel as the trigger source, the mark signal is output synchronously with the change of the trigger source, marking the change time of the signal of the input protection channel and the time when the signal completes the change.

5. The nuclear reactor protection channel signal injection device according to claim 4, characterized in that: The RTD signal generation module includes a resistor network and a relay; the embedded host controls the single-chip microcomputer through the serial port, and the single-chip microcomputer controls the precision resistor network and the relay to switch and output the required RTD signal according to the test instructions of the main control system.

6. The nuclear reactor protection channel signal injection device according to claim 4, characterized in that: The current signal generation module includes a low-speed DAC, an SPI-DAC and a space-time DAC; the single-chip microcomputer outputs a (0-5)V voltage signal to the low-speed DAC through the SPI-DAC according to the test instructions of the main control system, and the low-speed DAC converts the (0-5)V voltage signal into a (0-20)mA current signal and outputs it to the space-time DAC, and the space-time DAC converts the (0-20)mA current signal into an LDAC signal and outputs it to the protection channel, thereby realizing the synchronous output of multiple DACs.

7. The nuclear reactor protection channel signal injection device according to claim 6, characterized in that: The embedded host includes an FPGA; the digital pulse signal generation module includes a DIO chip and a first isolation chip; The main control system sends the digital pulse signal to the FPGA through network communication. After the FPGA analyzes the variables, it controls the DIO chip to send the TTL signal to the first isolation chip. The first isolation chip converts the TTL signal into an RS422 signal and outputs it to the digital pulse signal protection channel.

8. The nuclear reactor protection channel signal injection device according to claim 6, characterized in that: The trigger module includes a first trigger signal generating unit and a second trigger signal generating unit; Wherein, the first trigger signal generating unit is used for the embedded host to generate a trigger signal to upload to the main control system when determining that the RTD signal, digital pulse signal or analog pulse signal sent by the main control system is updated; The second trigger signal generating unit is used to generate a trigger signal to upload to the main control system when the embedded host determines that the current signal is updated.

9. The nuclear reactor protection channel signal injection device according to claim 8, characterized in that: The trigger module includes two counters; FPGA controls the two counters to record the moment when the protection channel signal changes and the moment when the signal completes the change; the trigger signal marks the beginning of the change of the protection channel signal; among them, the synchronous trigger generation corresponding to the RTD signal, digital pulse signal, and analog pulse signal output is controlled by FPGA, and another DO of FPGA is used to mark the changes of each channel quantity; the synchronous trigger signal corresponding to the current signal is generated by FPGA by controlling the synchronous output port of the low-speed DAC to mark the moment when the DAC is updated.

10. The nuclear reactor protection channel signal injection device according to claim 7, characterized in that: The analog pulse signal generation module includes a high-speed DAC, an AO chip and a second isolation chip; the FPGA controls the AO chip to output a digital pulse signal to the high-speed DAC, the high-speed DAC converts the digital pulse signal into an analog pulse signal and outputs it to the second isolation chip, the second isolation chip isolates the analog pulse signal and outputs it to the analog pulse signal protection channel.

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