A signal selection device for testing response time of a reactor protection system in a nuclear power plant

Abstract

The present invention relates to the field of nuclear power system control technology, and specifically discloses a nuclear power plant reactor protection system response time test signal selection device, wherein the 1st to 4th wire cores of the control command fast interface are connected to the input port on the relay matrix, the 5th to 6th wire cores of the control command fast interface are connected to the CAN protocol communication card, the 7th to 14th wire cores of the control command fast interface are connected to the four-way shutdown command fast interface, and the other end of the 1st to 14th wire cores of the control command fast interface is connected to the test terminal. The signal channel selection device of the present invention has the function of transmitting a large number of hard-wired signals using one signal cable, and has a quick connector, which can quickly access the signal line to avoid manually disconnecting a large number of wire cores.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power system control, and in particular relates to a response time test signal selection device for a reactor protection system of a nuclear power plant. Background Art

[0002] The reactor protection system of a nuclear power plant generally adopts a nuclear-grade digital control system KCS. Its main function is to prevent or reduce damage to the core and coolant system components by shutting down the reactor and (or) starting up special safety facilities under abnormal or accident conditions, ensuring the integrity of the three major nuclear safety barriers, avoiding the escape of large amounts of radioactive materials, and protecting the environment around the nuclear power plant from pollution and the safety of personnel.

[0003] The KCS system consists of several KCS protection cabinets, each of which contains a large number of KCS signal channels. The KCS protection cabinets jointly perform the reactor shutdown protection function to form a protection channel. The KCS system has four protection channels; the KCS protection cabinets jointly perform the dedicated safety facility drive function to form a safety dedicated drive column. The KCS system has two safety dedicated drive columns. The communication within the KCS system is realized in the form of hard wiring and optical fiber.

[0004] According to the safety standards of nuclear power plants, in order to ensure the confidence of the KCS system in achieving the expected protection function, it is necessary to conduct regular tests on the response time of its protection channels, such as triggering the shutdown and triggering the action of safety facilities, to verify that the response time is within the limits given in the safety analysis report. At present, the regular response time test is basically completed manually. The test process relies on multiple manual replacements of wiring to select the channels to be tested and trigger the test signal. Due to the large number of channels involved in the test, the workload of disconnecting the wiring is large and the risk of human error is high.

[0005] Since the signal cables of the operating nuclear power plants are all non-twisted copper core cables, the cable tray capacity is full, and the cable laying path has been blocked by fire prevention, it is difficult to lay new cables. Therefore, it is necessary to develop a selection device that uses the limited spare signal cables between the cabinets of the on-site protection channel and the cabinets of the dedicated safety equipment drive system to realize automatic switching of the signal channel to be tested, so as to solve the problems caused by the above manual implementation of the test. Summary of the invention

[0006] The purpose of the present invention is to provide a test signal selection device for the response time of a reactor protection system of a nuclear power plant, which utilizes a small amount of signal cables laid on site to realize the switching and transmission of multiple on-site signals one by one.

[0007] The technical solution of the present invention is as follows:

[0008] A nuclear power plant reactor protection system response time test signal selection device, comprising a chassis, a relay matrix, a downlink signal link, an uplink signal link, a CAN protocol communication card, a selection signal analyzer and a power module;

[0009] The relay matrix, downlink signal link, uplink signal link, CAN protocol communication card, selection signal analyzer and power module are arranged on the front of the main control board, the main control board is installed on the crossbeam guide rail, and the crossbeam guide rail is fixed on the side wall of the chassis;

[0010] An operation panel is provided on the front of the chassis, on which are provided 66-way output signal quick interfaces, 4-way shutdown command quick interfaces, control command quick interfaces, a power switch, a reserved channel, a status display screen and a 220VAC power interface;

[0011] The power modules respectively supply power to the relay matrix, the CAN protocol communication card, the selection signal analyzer and the status display screen;

[0012] The sixty-six output signal quick interfaces each include two wire cores;

[0013] The four-way shutdown command quick interface each includes two wire cores;

[0014] The control command fast interface comprises 14 wire cores in total, of which wire cores 1 to 4 are used for downlink signal links to transmit simulation signals; wire cores 5 to 6 are used for transmitting CAN communication information; and wire cores 7 to 14 are used for uplink signal links to transmit four-way shutdown commands.

[0015] The power interface includes 3 wire cores and is controlled by a power switch;

[0016] The wire cores 1 to 4 of the control command fast interface are connected to the input port on the relay matrix, the wire cores 5 to 6 of the control command fast interface are connected to the CAN protocol communication card, the wire cores 7 to 14 of the control command fast interface are connected to the four-way shutdown command fast interface, and the other end of the wire cores 1 to 14 of the control command fast interface is connected to the test terminal;

[0017] The sixty-six output signal fast interfaces are connected to the output ports on the relay matrix;

[0018] The reserved channel is connected to the CAN protocol communication card;

[0019] The relay matrix is ​​an integrated relay circuit board, which constitutes the preset channel of the selection device, and includes relays and a minimum replaceable relay board; the relays and the minimum replaceable relay board are installed on the back of the main control board;

[0020] 24 relays are sequentially arranged on each of the minimum replaceable relay boards;

[0021] The relay matrix is ​​installed on the crossbeam guide rail and connected to the selection signal analyzer through a signal cable; the relay output contacts of the relay are respectively connected to the sixty-six output signal quick interfaces through the signal cables;

[0022] The relay matrix receives two simulated input signals and controls the two relays in the relay matrix to operate according to the instructions of the selected signal analyzer, connects two signal channels in the sixty-six output signals, and injects the two simulated input signals into the corresponding KCS signal channels, so as to trigger the protection logic in the KCS system and generate the expected output instructions;

[0023] The selection signal analyzer is composed of a micro industrial control system with multiple output channels and a CAN bus protocol communication card. The selection signal analyzer uses the CAN bus as the communication protocol and a 2-core copper twisted pair as the communication medium to receive instructions from the test terminal and feed back its own fault and status information to the test terminal.

[0024] The test terminal has the functions of a simulation signal source and a high-speed recorder.

[0025] The selection signal analyzer multiplies the X by Y relay numbers in the relay matrix, controls the actions of relays with different numbers, and further controls the on and off of Y signal channels among the X signal channels, thereby forming an analyzer with the ability to select X out of Y signals;

[0026] The selection signal analyzer is connected to the status display screen;

[0027] The uplink signal link is used to receive the four-way command signal output of the KCS protection machine, send the four-way command signal to the control command fast interface through the four-way shutdown command fast interface, and transmit the signal to the test terminal through the control command fast interface for calculating the response time;

[0028] The downlink signal link is used to transmit the response time test simulation source signal and has a hard-wired interface; the downlink signal link is connected to the test terminal through a control instruction fast interface, and is connected to the KCS protection machine through a sixty-six-way output signal fast interface. The test terminal simulates signals and selection instructions, enters the relay matrix and CAN protocol communication card through the control instruction fast interface, and then selects and connects the corresponding signal channel in the sixty-six-way output signal fast interface to inject the simulation signal into the KCS protection machine.

[0029] The status display screen displays "CNNC" after the equipment is powered on and ready, and displays "CHx" after receiving the selection command from the test terminal, where x ranges from 1 to 66, meaning that the connection command for the x-th output signal has been received, and the corresponding relay has been controlled to connect the corresponding signal circuit.

[0030] The relay is provided with an indicator light when it is powered on. When the test light switch is closed to generate a test light signal, the corresponding relay LED indicator light is turned on, which facilitates visual inspection of whether the relay is in a normal state.

[0031] The reserved channels include DI, AI and AO channels without function division.

[0032] The sixty-six-channel output signal quick interface is a standard BNC interface, the four-channel shutdown command quick interface is a standard BNC interface, and the power supply interface adopts a BNC interface.

[0033] The relay matrix has an X-to-Y format, which is a 66-to-2 matrix topology.

[0034] The minimum replaceable relay board is plug-and-play, and the topology type can be changed to achieve different X-to-Y selection requirements.

[0035] It also includes a device nameplate arranged on the chassis operation panel, wherein the device nameplate displays characters of "signal channel selection device" and the color is RAL5000.

[0036] When working, the selection signal analyzer performs self-check and reads its own ID after power-on; then reads the number of times each relay channel is lit to determine whether the number of relay actions exceeds the threshold. If it exceeds the threshold, it prompts to replace the relay with the corresponding number. If it does not exceed the threshold, it feeds back its own ready status information to the test terminal, and then enters the standby state, waiting for the test terminal to issue a selection instruction; after receiving the selection instruction issued by the test terminal, it calculates the relay coding instruction, so that the relay with the corresponding number is energized and actuated, the relay output contact is closed, the corresponding signal channel is connected, and this selection is recorded in the EEPROM for life prediction.

[0037] Each of the four protection channels and two dedicated safety facility drive trains of the nuclear power plant's KCS system requires a signal channel selection device, for a total of six signal channel selection devices; each signal channel selection device has a unique identification code, so that when these devices are connected to the test terminal at the same time, the test terminal can inject the simulation signal into a specific signal channel selection device, and the test terminal can also receive the feedback signal of the corresponding signal channel selection device according to these identifications.

[0038] The remarkable effects of the present invention are:

[0039] (1) The signal channel selection device of the present invention has the function of transmitting a large number of hard-wired signals using one signal cable, such as injecting 66 channels of simulation signals into the KCS protection cabinet through one two-core cable.

[0040] (2) The signal channel selection device of the present invention is provided with a quick connector, which can quickly connect the signal line and avoid manually disconnecting a large number of wire cores.

[0041] (3) The relays in the signal channel selection device of the present invention can be used to estimate their lifespan. At the same time, the relay matrix is ​​provided with a switch for manually triggering the relays and is equipped with a signal light, so that faulty relays in the matrix can be quickly checked.

[0042] (4) The signal channel selection device of the present invention is provided with a minimum replaceable relay board, and components can be replaced when necessary without replacing all components.

[0043] (5) The signal selection mode in the signal channel selection device of the present invention can realize a variety of signal selection modes by replacing the topology board, such as selecting 2 channels from 66 input channels, or selecting 5 channels from 25 input channels, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the structure of the selection device;

[0045] Figure 2 This is a schematic diagram of the operation panel of the selection device;

[0046] Figure 3 It is a schematic diagram of the internal layout of the selection device;

[0047] Figure 4 It is a schematic diagram of the relay matrix;

[0048] Figure 5 This is a schematic diagram of the smallest replaceable relay board;

[0049] Figure 6 Schematic diagram of the 66-to-2 signal selection relay matrix;

[0050] Figure 7 This is the schematic diagram of the relay test light;

[0051] Figure 8 Schematic diagram of the workflow for selecting a signal analyzer.

[0052] In the figure: 1. KCS protection cabinet; 2. Chassis; 3. Relay matrix; 4. Downlink signal link; 5. Uplink signal link; 6. Test terminal; 7. CAN protocol communication card; 8. Select signal analyzer; 9. Power module; 10. Main control board; 11. Minimum replaceable relay board; 12. Relay; 13. Sixty-six output signals; 14. Two-way simulation input signal; 15. Relay output contact; 16. Relay LED indicator; 17. Test light switch; 18. Sixty-six output signal quick interface; 19. Four-way shutdown command quick interface; 20. Device nameplate; 21. Control command quick interface; 22. Power switch; 23. Reserved channel; 24. Status display screen; 25. Power interface; 26. Beam guide rail. DETAILED DESCRIPTION

[0053] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] like Figure 1 A nuclear power plant reactor protection system response time test signal selection device is shown, comprising a chassis (2), a relay matrix (3), a downlink signal link (4), an uplink signal link (5), a CAN protocol communication card (7), a selection signal analyzer (8) and a power module (9).

[0055] The relay matrix (3), downlink signal link (4), uplink signal link (5), CAN protocol communication card (7), selection signal analyzer (8) and power module (9) are arranged on the front of the main control board (10), the main control board (10) is installed on the crossbeam guide rail (26), and the crossbeam guide rail (26) is fixed on the side wall of the chassis (2).

[0056] like Figure 2 , 3 As shown, an operation panel is provided on the front of the chassis (2), and a sixty-six-way output signal quick interface (18), a four-way shutdown command quick interface (19), a device nameplate (20), a control command quick interface (21), a power switch (22), a reserved channel (23), a status display screen (24) and a 220VAC power interface (25) are provided on the operation panel. The power module (9) respectively supplies power to the relay matrix (3), the CAN protocol communication card (7), the selection signal analyzer (8) and the status display screen (24).

[0057] The sixty-six output signal quick interfaces (18) are standard BNC interfaces, each including two wire cores. The four-way shutdown command quick interfaces (19) are standard BNC interfaces, each including two wire cores. The device nameplate (20) displays the characters "Signal channel selection device" in RAL5000 color.

[0058] The control command fast interface (21) comprises 14 wire cores in total, of which wire cores 1 to 4 are used for downlink signal link (4) to transmit simulation signals; wire cores 5 to 6 are used for transmitting CAN communication information; and wire cores 7 to 14 are used for uplink signal link (5) to transmit four-way shutdown instructions. The power interface (25) adopts a BNC interface, comprises 3 wire cores, and is controlled by a power switch (22).

[0059] The reserved channels (23) include DI, AI and AO channels without function division.

[0060] The wire cores No. 1 to No. 4 of the control command quick interface (21) are connected to the input port on the relay matrix (3), the wire cores No. 5 to No. 6 of the control command quick interface (21) are connected to the CAN protocol communication card (7), the wire cores No. 7 to No. 14 of the control command quick interface (21) are connected to the four-way shutdown command quick interface (19), the other end of the wire cores No. 1 to No. 14 of the control command quick interface (21) is connected to the test terminal (6), and the sixty-six-way output signal quick interface (18) is connected to the output port on the relay matrix (3); the reserved channel (23) is connected to the CAN protocol communication card (7).

[0061] The status display screen (24) displays "CNNC" after the device is powered on and ready, and displays "CHx" after receiving the selection command from the test terminal (6), where x is a value of 1 to 66, meaning that the connection command for the x-th output signal has been received and the corresponding relay (12) has been controlled to operate and connect the corresponding signal circuit.

[0062] like Figure 4 As shown, the relay matrix (3) is an integrated relay circuit board, which constitutes a preset channel of the selection device, and includes a relay (12) and a minimum replaceable relay board (11). The relay (12) and the minimum replaceable relay board (11) are installed on the back of the main control board (10). 24 relays (12) are arranged in sequence on each of the minimum replaceable relay boards (11). Figure 5 As shown, the minimum replaceable relay board (11) is plug-and-play, and the topology type can be changed to meet different X-to-Y selection requirements.

[0063] The relay matrix (3) is mounted on a crossbeam guide rail (26) and connected to a selection signal analyzer (8) via a signal cable. The relay output contacts (15) of the relay (12) are respectively connected to sixty-six output signal quick interfaces (18) via signal cables.

[0064] The relay matrix (3) has the form of X taking Y, such as Figure 6The 66 out of 2 matrix topology is shown. The relay matrix (3) receives two simulated input signals (14) as injection, such as two downlink simulated signals r0 to r1, and controls the two relays in the relay matrix (3) to operate according to the instruction of the selection signal analyzer (8), connects two signal channels in the sixty-six output signals (13), and injects the two simulated input signals (14) into the corresponding KCS signal channels, so as to trigger the protection logic in the KCS system and generate the expected output instruction.

[0065] The relay (12) is provided with an indicator light when it is energized. Figure 7 As shown, when the test light switch (17) is closed to generate a test light signal, the corresponding relay LED indicator (16) is lit, so as to facilitate visual inspection of whether the relay (12) is in a normal state.

[0066] The selective signal analyzer (8) is composed of a micro industrial control system with multiple output channels and a CAN bus protocol communication card. The selective signal analyzer (8) uses the CAN bus as a communication protocol and a 2-core copper twisted pair as a communication medium to receive instructions from the test terminal (6) and feed back its own fault and status information to the test terminal (6). The test terminal (6) has the functions of a simulation signal source and a high-speed recorder.

[0067] The selection signal analyzer (8) numbers the X times Y relays (12) in the relay matrix (3), controls the actions of the relays (12) with different numbers, and further controls the on and off of Y signal channels among the X signal channels, thereby forming an analyzer with the ability to select X out of Y signals. The selection signal analyzer (8) is connected to the status display screen (24).

[0068] The uplink signal link (5) is used to receive the four-way command signal output of the KCS protection machine (1), send the four-way command signal to the control command fast interface (21) through the four-way shutdown command fast interface (19), and transmit the signal to the test terminal (6) through the control command fast interface (21) for calculating the response time.

[0069] The downlink signal link (4) is used to transmit the response time test simulation source signal and has a hard-wired interface. The downlink signal link (4) is connected to the test terminal (6) through the control command fast interface (21), and is connected to the KCS protection machine (1) through the sixty-six-way output signal fast interface (18). The test terminal (6) simulates the signal and selects the instruction, enters the relay matrix (3) and the CAN protocol communication card (7) through the control command fast interface (21), and then selects the corresponding signal channel in the sixty-six-way output signal fast interface (18) to inject the simulation signal into the KCS protection machine (1).

[0070] At work, if Figure 8 As shown, the selection signal analyzer (8) performs self-checking and reads its own ID after power-on; then reads the number of times each relay channel is lit, and determines whether the number of times the relay (12) operates exceeds a threshold value. If it exceeds the threshold value, it prompts to replace the relay (12) with the corresponding number; if it does not exceed the threshold value, it feeds back its own ready state information to the test terminal (6), and then enters a standby state, waiting for the test terminal (6) to issue a selection instruction; after receiving the selection instruction issued by the test terminal (6), it calculates the relay (12) coding instruction, so that the relay (12) with the corresponding number is energized and operated, the relay output contact (15) is closed, the corresponding signal channel is connected, and the current selection is recorded in the EEPROM for life prediction.

[0071] The four protection channels and two safety-specific facility drive trains of the nuclear power plant KCS system each require a signal channel selection device, for a total of six signal channel selection devices. Each signal channel selection device has a unique identification code, so that when these devices are connected to the test terminal (6) at the same time, the test terminal (6) can inject a simulation signal into a specific signal channel selection device, and the test terminal (6) can also receive feedback signals from the corresponding signal channel selection device according to these identifications.

[0072] The examples of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, which all belong to the protection scope of the present invention.

Claims

1. A test signal selection device for response time of a reactor protection system in a nuclear power plant, characterized in that: It includes a chassis (2), a relay matrix (3), a downlink signal link (4), an uplink signal link (5), a CAN protocol communication card (7), a selection signal analyzer (8) and a power module (9); The relay matrix (3), downlink signal link (4), uplink signal link (5), CAN protocol communication card (7), selection signal analyzer (8) and power module (9) are arranged on the front of the main control board (10), the main control board (10) is installed on the crossbeam guide rail (26), and the crossbeam guide rail (26) is fixed on the side wall of the chassis (2); An operation panel is provided on the front of the chassis (2), and is provided with sixty-six output signal quick interfaces (18), four shutdown command quick interfaces (19), a control command quick interface (21), a power switch (22), a reserved channel (23), a status display screen (24) and a 220VAC power interface (25); The power supply module (9) supplies power to the relay matrix (3), the CAN protocol communication card (7), the selection signal analyzer (8) and the status display screen (24) respectively; The sixty-six output signal quick interfaces (18) each include two wire cores; The four-way shutdown command quick interface (19) each comprises two wire cores; The control command fast interface (21) comprises a total of 14 wire cores, wherein wire cores 1 to 4 are used for a downlink signal link (4) to transmit simulation signals; wire cores 5 to 6 are used for transmitting CAN communication information; and wire cores 7 to 14 are used for an uplink signal link (5) to transmit four-way shutdown commands. The power interface (25) comprises three wire cores and is controlled by a power switch (22); The wire cores No. 1 to No. 4 of the control command fast interface (21) are connected to the input port on the relay matrix (3), the wire cores No. 5 to No. 6 of the control command fast interface (21) are connected to the CAN protocol communication card (7), the wire cores No. 7 to No. 14 of the control command fast interface (21) are connected to the four-way shutdown command fast interface (19), and the other end of the wire cores No. 1 to No. 14 of the control command fast interface (21) is connected to the test terminal (6); The sixty-six output signal quick interfaces (18) are connected to the output ports on the relay matrix (3); The reserved channel (23) is connected to the CAN protocol communication card (7); The relay matrix (3) is an integrated relay circuit board, constituting a preset channel of the selection device, and comprising a relay (12) and a minimum replaceable relay board (11); the relay (12) and the minimum replaceable relay board (11) are mounted on the back of the main control board (10); 24 relays (12) are sequentially arranged on each of the minimum replaceable relay boards (11); The relay matrix (3) is mounted on a crossbeam guide rail (26) and connected to a selection signal analyzer (8) via a signal cable; the relay output contacts (15) of the relays (12) are respectively connected to sixty-six output signal quick interfaces (18) via signal cables; The relay matrix (3) receives two simulated input signals (14) and controls the two relays in the relay matrix (3) to operate according to the instructions of the selected signal analyzer (8), connects two signal channels in the sixty-six output signals (13), and injects the two simulated input signals (14) into the corresponding KCS signal channels, so as to trigger the protection logic in the KCS system and generate the expected output instructions; The selection signal analyzer (8) is composed of a micro industrial control system with multiple output channels and a CAN bus protocol communication card. The selection signal analyzer (8) uses the CAN bus as a communication protocol and a 2-core copper twisted pair as a communication medium to receive instructions from the test terminal (6) and feed back its own fault and status information to the test terminal (6); The test terminal (6) has the functions of a simulation signal source and a high-speed recorder; The selection signal analyzer (8) numbers the X times Y relays (12) in the relay matrix (3), controls the actions of the relays (12) with different numbers, and further controls the on and off of Y signal channels among the X signal channels, thereby forming an analyzer with the ability to select X out of Y signals; The selection signal analyzer (8) is connected to the status display screen (24); The uplink signal link (5) is used to receive the four-way command signal output of the KCS protection machine (1), send the four-way command signal to the control command fast interface (21) through the four-way shutdown command fast interface (19), and transmit the signal to the test terminal (6) through the control command fast interface (21) for calculating the response time; The downlink signal link (4) is used to transmit the response time test simulation source signal and has a hard-wired interface; the downlink signal link (4) is connected to the test terminal (6) through the control command fast interface (21), and is connected to the KCS protection machine (1) through the sixty-six-way output signal fast interface (18); the test terminal (6) simulates the signal and selects the instruction, enters the relay matrix (3) and the CAN protocol communication card (7) through the control command fast interface (21), and then selects and connects the corresponding signal channel in the sixty-six-way output signal fast interface (18), and injects the simulation signal into the KCS protection machine (1).

2. A nuclear power plant reactor protection system response time test signal selection device as claimed in claim 1, characterized in that: The status display screen (24) displays "CNNC" after the device is powered on and ready, and displays "CHx" after receiving the selection command from the test terminal (6), where x is a value from 1 to 66, meaning that the connection command for the x-th output signal has been received and the corresponding relay (12) has been controlled to operate, connecting the corresponding signal circuit.

3. A nuclear power plant reactor protection system response time test signal selection device as claimed in claim 2, characterized in that: The relay (12) is provided with an indicator light when it is powered on, and when the test light switch (17) is closed to generate a test light signal, the corresponding relay LED indicator light (16) is lit, so as to facilitate visual inspection of whether the relay (12) is in a normal state.

4. A device for selecting a response time test signal for a reactor protection system in a nuclear power plant according to claim 3, characterized in that: The reserved channels (23) include DI, AI and AO channels without function division.

5. A device for selecting a response time test signal for a reactor protection system of a nuclear power plant according to claim 4, characterized in that: The sixty-six-channel output signal quick interface (18) is a standard BNC interface, the four-channel shutdown command quick interface (19) is a standard BNC interface, and the power supply interface (25) adopts a BNC interface.

6. A device for selecting a response time test signal for a reactor protection system in a nuclear power plant according to claim 5, characterized in that: The relay matrix (3) has an X-to-Y format, which is a 66-to-2 matrix topology.

7. A device for selecting a response time test signal for a reactor protection system of a nuclear power plant according to claim 6, characterized in that: The minimum replaceable relay board (11) is plug-and-play, and the topology type can be changed to meet different X-to-Y selection requirements.

8. A device for selecting a response time test signal for a reactor protection system in a nuclear power plant according to claim 7, characterized in that: It also includes a device nameplate (20) arranged on the operating panel of the chassis (2), wherein the device nameplate (20) displays characters "signal channel selection device" and has a color of RAL5000.

9. A device for selecting a response time test signal for a reactor protection system in a nuclear power plant according to any one of claims 1 to 8, characterized in that: When working, the selection signal analyzer (8) performs self-checking and reads its own ID after power-on; then reads the number of times each relay channel is lit, and determines whether the number of times the relay (12) operates exceeds a threshold value; if it exceeds the threshold value, it prompts to replace the corresponding numbered relay (12); if it does not exceed the threshold value, it feeds back its own ready state information to the test terminal (6), and then enters a standby state, waiting for the test terminal (6) to issue a selection instruction; after receiving the selection instruction issued by the test terminal (6), it calculates the relay (12) coding instruction, so that the corresponding numbered relay (12) is energized and operated, the relay output contact (15) is closed, the corresponding signal channel is connected, and the current selection is recorded in the EEPROM for life prediction.

10. A nuclear power plant reactor protection system response time test signal selection device as claimed in claim 9, characterized in that: Each of the four protection channels and two dedicated safety facility drive trains of the KCS system of a nuclear power plant requires a signal channel selection device, for a total of six signal channel selection devices; each signal channel selection device has a unique identification code, so that when these devices are connected to the test terminal (6) at the same time, the test terminal (6) can inject a simulation signal into a specific signal channel selection device, and the test terminal (6) can also receive feedback signals from the corresponding signal channel selection devices according to these identifications.

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