A module-level testing device and testing method for nuclear reactor safety instrumentation and control equipment.

Abstract

This invention relates to the field of nuclear reactor safety instrumentation and control, and more particularly to a module-level testing device and method for nuclear reactor safety instrumentation and control equipment. The device includes: a housing with a front panel, a rear panel, and a testing module; the testing module is located inside the housing and includes a main controller module, and connected to the main controller module are a storage circuit, an analog electrical signal acquisition circuit, an analog electrical signal output circuit, an analog resistance output circuit, an impedance measurement circuit, an insulation detection circuit, and a power supply circuit; the main controller module is also connected to a display screen and a data export interface. This invention allows for the free addition and modification of test items according to the device under test and testing requirements, enabling comprehensive testing of all modules of the nuclear reactor safety instrumentation and control equipment. It achieves a high degree of integration and modular design, improving the portability of the equipment and enhancing testing efficiency and accuracy.

Description

Technical Field

[0001] This invention relates to the field of nuclear reactor safety instrumentation and control, and in particular to a module-level testing device and testing method for nuclear reactor safety instrumentation and control equipment. Background Technology

[0002] A nuclear reactor is a highly complex and energy-intensive system used to initiate, control, and sustain a nuclear fission or fusion chain reaction. Although nuclear reactors are designed with numerous safety features, the inherent nature of nuclear energy means that even minor malfunctions during system operation can lead to catastrophic consequences. The reactor's safety instrumentation and control (AEC) equipment is crucial for monitoring, controlling, and protecting the safe operation of the nuclear reactor. It is closely integrated with other reactor systems (such as the cooling system, reactor body, and control rod system) to ensure the reactor operates within safe limits, thereby minimizing the risks associated with nuclear energy use and protecting public health and environmental safety. Therefore, the accuracy of testing safety AEC equipment is paramount.

[0003] Existing nuclear reactor safety-critical instrumentation and control equipment typically consists of multiple complex modules that operate independently yet collaborate closely. Various sensors monitor key reactor parameters in real time. When a danger signal is detected or an anomaly occurs in reactor operation, relays quickly initiate an emergency shutdown to interrupt the nuclear fission reaction and rapidly reduce reactor power. In practical applications, some modules may fail. Module-level testing can verify whether the system has a robust fault isolation mechanism, preventing fault propagation and impacting other modules or systems. However, existing testing equipment fails to adequately consider the smoothness and real-time nature of operator-equipment interaction, leading to operational difficulties during testing. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a module-level testing device and testing method for nuclear reactor safety instrumentation and control equipment, which can freely add and modify test items according to the equipment under test and testing requirements, and conduct comprehensive testing on each module of the nuclear reactor safety instrumentation and control equipment. It can achieve a high degree of integration and modular design, improve the portability of the equipment, and improve testing efficiency and accuracy.

[0005] This invention provides a module-level testing device for nuclear reactor safety instrumentation and control equipment, comprising: a housing, the housing having a front panel, a rear panel, and a testing module;

[0006] The front panel has a display screen, below which are the power button and data export interface. On one side of the display screen are test interfaces, including an analog resistance output interface, an impedance measurement interface, an insulation resistance measurement interface, multiple analog electrical signal input interfaces, and an analog electrical signal output interface. The rear panel has a power switch and a power supply interface.

[0007] The test module is located inside the enclosure and includes a main controller module, as well as storage circuits, analog electrical signal acquisition circuits, analog electrical signal output circuits, analog resistance output circuits, impedance measurement circuits, insulation detection circuits, and power supply circuits connected to the main controller module; the main controller module is also connected to a display screen and a data export interface;

[0008] The main controller module is used to receive input data from the analog electrical signal acquisition circuit, impedance measurement circuit, and insulation detection circuit, and transmit the data to the display screen after measurement and analysis. It is also used to receive operation commands input through the display screen, send signal output commands to the analog electrical signal output circuit and analog resistance output circuit, save the measurement data to the storage circuit according to the operation commands, and send the measurement data to the data export interface for export.

[0009] The input terminal of the analog electrical signal acquisition circuit is connected to the corresponding analog electrical signal input interface; the output terminal of the analog electrical signal output circuit is connected to multiple analog electrical signal output interfaces; the output terminal of the analog resistance output circuit is connected to the analog resistance output interface; the input terminal of the impedance measurement circuit is connected to the impedance measurement interface; the input terminal of the insulation detection circuit is connected to the insulation resistance measurement interface; the input terminal of the power supply circuit is connected to the power interface, and the output terminal is connected to each circuit of the test module to provide power to each circuit.

[0010] In one specific embodiment of the present invention, the analog electrical signal acquisition circuit is used to acquire and convert the input voltage or current analog signal, and includes a signal conditioning unit, a gain control unit, an active filter unit, an ADC acquisition unit and an opto-isolation unit connected in sequence.

[0011] The signal conditioning unit provides electrical isolation between the external input signal and the analog electrical signal acquisition circuit, and also converts the input current signal into a voltage signal for input to the gain control unit. The gain control unit controls the gain of the analog voltage signal to ensure that the signal strength meets the preset input range. The active filtering unit removes noise interference from the signal. The ADC acquisition unit converts the analog voltage signal into a digital signal. The opto-isolation unit provides electrical isolation between the analog electrical signal acquisition circuit and the main controller module.

[0012] The signal conditioning unit includes an optocoupler and a load resistor. One end of the load resistor is connected to the analog electrical signal input interface, and the other end is connected to the output end of the optocoupler. The control end of the optocoupler is electrically connected to the signal output port of the main controller module.

[0013] In one specific embodiment of the present invention, the analog electrical signal output circuit uses a first digital-to-analog converter module and a second digital-to-analog converter module for dual-channel control output, and the input terminals of both the first digital-to-analog converter module and the second digital-to-analog converter module are connected to the main controller module;

[0014] The first digital-to-analog converter module is a multi-channel output module used to output analog voltage signals and uses electronic switches to switch signals between different channels.

[0015] The second digital-to-analog converter module is a single-channel output module used to output analog current signals.

[0016] In one specific embodiment of the present invention, the first digital-to-analog conversion module is a DAC81416 chip; the second digital-to-analog conversion module is an AD5422 chip.

[0017] In one specific embodiment of the present invention, the analog resistor output circuit uses an electronically simulated synthesized resistor to realize the output of the thermal resistor; it includes an input operational amplifier A1, a DA converter, an output operational amplifier A2, an inverting amplifier A3, and a standard resistor R0;

[0018] One end of the standard resistor R0 is connected to the positive input port of the input operational amplifier A1, and the other end is connected to the negative input port and the output port of the output operational amplifier A2.

[0019] The negative input port of input operational amplifier A1 is connected to the input port of the DA converter. The output port of the DA converter is connected to the inverting amplifier A3 through resistors R1 and R2 to form a proportional amplifier circuit. The output port of inverting amplifier A3 is connected to the positive input port of output operational amplifier A2.

[0020] In one specific embodiment of the present invention, the impedance measurement circuit is implemented using a proportional measurement circuit, including a voltage divider resistor R3 and an AD module;

[0021] One end of the voltage divider resistor R3 is connected to the reference voltage, and the other end is connected to one end of the input impedance Rx and the positive input terminal of the AD module; the other end of the input impedance Rx is grounded; the negative input terminal of the AD module is grounded.

[0022] In one specific embodiment of the present invention, the power supply circuit includes an AC-DC module, wherein the input terminal of the AC-DC module is connected to a power interface, and the output terminal is connected to a DC-DC isolation conversion module and a boost module.

[0023] The AC-DC module is used to convert 220V AC power input through the power interface into 24V DC power and input it to the DC isolation conversion module and the boost module;

[0024] The DC-DC isolation converter module is used to convert 24V DC power to DC voltage, with an output voltage range of -15V to +15V. The converted output voltage is supplied to the main controller module, storage circuit, analog electrical signal acquisition circuit, analog electrical signal output circuit, analog resistance output circuit, impedance measurement circuit, and insulation detection circuit.

[0025] The boost module is used to boost 24V DC to 500V high voltage DC to supply the insulation resistance measurement circuit.

[0026] In one specific embodiment of the present invention, the insulation resistance measurement circuit includes a protection unit, a measurement unit, and a self-test unit; the measurement unit is connected to the protection unit and the self-test unit, the input terminals of the self-test unit and the measurement unit are both connected to the insulation resistance measurement interface, and the output terminals of the self-test unit and the measurement unit are both connected to the main controller module; the input terminal of the protection unit is connected to the power supply circuit, and the output terminal is connected to the measurement unit.

[0027] The self-test unit is used to detect the 500V DC input voltage value when powered on, ensuring that the voltage value is within the preset safety range;

[0028] The protection unit is used to protect the back-end circuitry from damage caused by voltage fluctuations;

[0029] The measurement unit is used to detect the current flowing through the device under test based on 500V high voltage DC power in order to calculate the resistance of the device under test.

[0030] This invention provides a module-level testing method for nuclear reactor safety instrumentation and control equipment, comprising the following steps:

[0031] After powering on, the device performs a self-test to confirm that it is in normal working condition.

[0032] Receive test scheme configuration and baseline characteristic data via the display;

[0033] The signal channel was determined according to the test plan configuration, and its normal operation was confirmed by internal DA output and AD signal acquisition.

[0034] When the plug-in under test is detected, the impedance measurement circuit is used to check whether there is a short circuit in the power signal line of the plug-in under test.

[0035] If no power signal short circuit occurs, the data signal impedance is tested through the impedance measurement circuit to determine whether the signal impedance is consistent with the reference characteristic data. If the data is consistent, the test is passed.

[0036] After the test is passed, power on the plug-in under test and perform real-time functional testing on the plug-in under test according to the test plan;

[0037] Summarize and analyze the test data from all tests, output a test report, and disconnect from the plugin under test.

[0038] In one specific embodiment of the present invention, the test scheme configuration includes test type configuration and test execution configuration;

[0039] The test type configuration includes analog signal testing and data acquisition signal testing; the signal flow direction of analog signal testing is from the output of the test device to the device under test, and the signal flow direction of data acquisition signal testing is from the device under test to the test device.

[0040] The test run configuration includes automatic test mode and manual test mode. In automatic test mode, the modular test steps stored in the device are called to perform tests on the device under test. In manual test mode, the test step input interface is provided through the display screen, and the device under test is tested according to the obtained test steps.

[0041] Compared with the prior art, the module-level testing device and testing method for nuclear reactor safety instrumentation and control equipment of the present invention have the following beneficial effects:

[0042] 1. This device has a simple design. Operators can input commands through the display screen on the front panel, export test data through the data export interface, and perform corresponding equipment tests through different test interfaces. This facilitates centralized management and operation of the equipment. Through integrated and modular settings, the convenience and real-time performance of operation are improved.

[0043] 2. Provides comprehensive testing for signal acquisition and output. The device provides testing for isolator signal accuracy, input / output impedance, insulation impedance, response time, power consumption, etc., all using independent interfaces for easy user connection. Users can choose the appropriate interface based on the model or type of the module being tested.

[0044] 3. Through a unified control unit, input data from various circuits is received and analyzed, corresponding operation commands are generated, and control and adjustment are performed, making data processing during the testing process more efficient and accurate. This ensures real-time data display and subsequent storage and export, improving the transparency and traceability of the testing process.

[0045] 4. Through software and hardware configuration, test items can be freely added, modified, and deleted according to the specifications of the product under test. Test and judgment parameters for each test item can also be edited. The one-click start test function can be selected to realize automatic testing of various functions, store relevant inspection and testing data, and output standard reports.

[0046] 5. As an open system, users can add and adjust hardware devices to expand the testing capabilities of the automated testing system. Report formats can be edited according to test report requirements.

[0047] 6. Highly integrated and automated, with a user-friendly human-machine interface, adjustable test items and parameters, while providing reliability analysis of security-grade isolation cards and developing corresponding preventive maintenance strategies.

[0048] This invention provides comprehensive testing of signal acquisition and output, supporting independent testing of multiple indicators such as accuracy, impedance, response time, and power consumption. It facilitates connection with different modules to meet diverse testing needs. A unified control unit efficiently receives and analyzes data, generating precise operating instructions to ensure real-time display, storage, and export of test data, enhancing the transparency and traceability of the testing process. Simultaneously, the system supports flexible configuration, allowing users to freely add and modify test items and set judgment parameters according to the specifications of the product under test, achieving automated testing, reducing human intervention, and improving testing efficiency and accuracy. As an open system, users can also expand hardware devices and adjust test functions as needed, customizing report output, further enhancing the system's flexibility and scalability. Furthermore, the device features a user-friendly human-machine interface, secure isolation cards provide reliability analysis, and preventative maintenance strategies can be developed to ensure long-term stable operation of the equipment. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the module-level testing device for nuclear reactor instrumentation and control equipment provided by the present invention;

[0050] Figure 2 A schematic diagram of the back panel of the testing device is provided for this invention;

[0051] Figure 3 This is a schematic diagram of the structure of the test module provided by the present invention;

[0052] Figure 4 This is a schematic diagram of the structure of the analog electrical signal acquisition circuit provided by the present invention;

[0053] Figure 5 This is a schematic diagram of an analog electrical signal acquisition circuit including the internal structure of a signal conditioning unit provided by the present invention;

[0054] Figure 6 This is a schematic diagram of the structure of the analog electrical signal output circuit provided by the present invention;

[0055] Figure 7 A schematic diagram of the structure of the analog resistor output circuit provided by the present invention;

[0056] Figure 8 A schematic diagram of the structure of the analog resistor output circuit provided by the present invention;

[0057] Figure 9 This is a schematic diagram of the power supply circuit structure provided by the present invention;

[0058] Figure 10 A flowchart illustrating the module-level testing method for nuclear reactor instrumentation and control equipment provided by this invention;

[0059] Figure 11 This is a schematic diagram of the test project interface provided by the present invention;

[0060] In the diagram, 1-box, 2-front panel, 3-rear panel, 4-test module, 5-display screen, 6-power button, 7-data export interface, 8-test interface, 9-resistance output interface, 10-impedance measurement interface, 11-insulation resistance measurement interface, 12-analog electrical signal input interface, 13-analog electrical signal output interface, 14-power switch, 15-power supply interface. Detailed Implementation

[0061] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.

[0062] Example 1

[0063] Please see Figure 1 The module-level testing device for nuclear reactor instrumentation and control equipment provided in this embodiment includes a housing 1, which is provided with a front panel 2, a rear panel 3 and a testing module 4.

[0064] The front panel 2 is equipped with a display screen 5. Below the display screen 5 are a power button 6 and a data export interface 7. A test interface 8 is located on one side of the display screen 5. The test interface 8 includes an analog resistance output interface 9, an impedance measurement interface 10, an insulation resistance measurement interface 11, multiple analog electrical signal input interfaces 12, and an analog electrical signal output interface 13. Figure 2 As shown, the rear panel 2 is equipped with a power switch 14 and a power supply interface 15;

[0065] Test module 4 is located inside housing 1, such as Figure 3 As shown, the test module 4 includes a main controller module, as well as a storage circuit, an analog electrical signal acquisition circuit, an analog electrical signal output circuit, an analog resistance output circuit, an impedance measurement circuit, an insulation detection circuit, and a power supply circuit connected to the main controller module; the main controller module is also connected to the display screen 5 and the data export interface 7.

[0066] The main controller module is used to receive input data from the analog electrical signal acquisition circuit, impedance measurement circuit, and insulation detection circuit, and transmit the data to the display screen after measurement and analysis. It is also used to receive operation commands input through the display screen, send signal output commands to the analog electrical signal output circuit and analog resistance output circuit, save the measurement data to the storage circuit according to the operation commands, and send the measurement data to the data export interface for export.

[0067] The input terminal of the analog electrical signal acquisition circuit is connected to the corresponding analog electrical signal input interface 12; the output terminal of the analog electrical signal output circuit is connected to multiple analog electrical signal output interfaces 13; the output terminal of the analog resistance output circuit is connected to the analog resistance output interface 9; the input terminal of the impedance measurement circuit is connected to the impedance measurement interface 10; the input terminal of the insulation detection circuit is connected to the insulation resistance measurement interface 11; the input terminal of the power supply circuit is connected to the power interface 15, and the output terminal is connected to each circuit of the test module to provide power to each circuit.

[0068] This embodiment proposes a simple design that facilitates operator input of test commands and export of test data via a data export interface. Different test interfaces enable corresponding equipment testing, aiding in centralized equipment management and operation. The integrated and modular design enhances operational convenience and real-time performance. The device provides testing for isolator signal accuracy, input / output impedance, insulation impedance, response time, and power consumption, all using independent interfaces for easy user connection based on the module model or type under test. A unified control unit receives and analyzes input data from various circuits, generating corresponding operation commands for control and adjustment, making data processing more efficient and accurate during testing. This ensures real-time data display and subsequent storage and export, improving the transparency and traceability of the testing process.

[0069] Specifically, to increase the portability of the device, the entire unit is designed as a portable, handheld chassis (400mm × 310mm × 130mm (L × H × D)), weighing no more than 10kg. A carrying handle is provided on the top of the chassis for easy transport to the field. All four corners of the chassis are rounded to avoid sharp protrusions, and protective sleeves are installed on impact-prone areas (such as the corners) to prevent damage during transportation. This device allows for online monitoring of field equipment without disassembly, and will not cause destructive damage to the isolation components during the monitoring process.

[0070] The data export interface includes a USB port and a LAN port, allowing users to interact with the computer and export and transmit experimental data via an external mouse and keyboard.

[0071] Example 2

[0072] Analog electrical signal acquisition circuits are used to acquire and convert input analog voltage or current signals, such as... Figure 4 As shown, the analog electrical signal acquisition circuit includes a signal conditioning unit, a gain control unit, an active filter unit, an ADC acquisition unit, and an opto-isolation unit connected in sequence.

[0073] The signal conditioning unit provides electrical isolation between the external input signal and the analog electrical signal acquisition circuit, and also converts the input current signal into a voltage signal for input to the gain control unit. The gain control unit controls the gain of the analog voltage signal to ensure that the signal strength meets the preset input range. The active filtering unit removes noise interference from the signal. The ADC acquisition unit converts the analog voltage signal into a digital signal. The opto-isolation unit provides electrical isolation between the analog electrical signal acquisition circuit and the main controller module.

[0074] Analog input signal front-end conditioning not only includes signal conditioning, but also, for current-mode signal acquisition, achieves current-to-voltage conversion in the front-end conditioning circuit. This means that during the back-end circuit acquisition and processing, the actual signal processed is a voltage signal. Furthermore, ESD (electrostatic discharge) protection measures are implemented to effectively prevent electrostatic damage to the entire acquisition channel.

[0075] Among them, such as Figure 5 As shown, the signal conditioning unit includes an optocoupler and a load resistor. One end of the load resistor is connected to the analog electrical signal input interface, and the other end is connected to the output end of the optocoupler. The control end of the optocoupler is electrically connected to the signal output port of the main controller module.

[0076] Figure 5 In this test, the selected ADC has a voltage acquisition range of up to ±10V. After the front-end current is converted into voltage, the voltage is 24mA × 100Ω = 2.4V. Therefore, it can meet the voltage acquisition range requirement of 0 to 20mA.

[0077] To further enhance the integration of the device, the ADC acquisition circuit uses Analog Devices' AD7610. The input range and operating mode of this device can be configured via hardware or a dedicated write-only serial configuration port. The AD7610 integrates a 16-bit high-speed sampling ADC, an internal conversion clock, an internal reference voltage source (with buffer), error correction circuitry, and serial and parallel system interface ports. Using the AD7610 simplifies the design, improves the stability of the device, and ensures normal operation in complex and harsh environments, demonstrating excellent performance in nuclear reactor safety instrumentation and control scenarios requiring high precision and reliability.

[0078] The analog electrical signal output circuit uses a first digital-to-analog converter module and a second digital-to-analog converter module for dual-channel control output. The input terminals of both the first digital-to-analog converter module and the second digital-to-analog converter module are connected to the main controller module.

[0079] The first digital-to-analog converter module is a multi-channel output module used to output analog voltage signals and uses electronic switches to switch signals between different channels.

[0080] The second digital-to-analog converter module is a single-channel output module used to output analog current signals.

[0081] like Figure 6 As shown, the first digital-to-analog converter module DA1 is designed with 16 channels. It works with electronic switches to switch the signals between channels and finally outputs the signals to the board under test through the wiring network. DA1 can output voltage signals from 0V to 10V. The second digital-to-analog converter module is used to output current signals from 0mA to 20mA.

[0082] Specifically, the first digital-to-analog converter (DAC) module is a DAC81416 chip; the second DAC module is an AD5422 chip. The DA1 analog output chip is the TI DAC81416, a 16-channel, 16-bit DAC chip with an output voltage range of up to 40V and a drive current of ±25mA, meeting user requirements. The DA2 analog output chip is the Analog Devices AD5422, a precision, fully integrated 16-bit digital-to-analog converter (DAC) with a built-in programmable current source and programmable voltage output, designed to meet the needs of industrial process control applications. Testing shows that the device's current output range is 0–20mA with an accuracy ≤0.05%FS; the voltage output range is 0–10V with an accuracy ≤0.05%FS.

[0083] Furthermore, the analog signal output circuit features short-circuit and open-circuit protection and can drive a 1μF capacitive load. The device's AVDD operating voltage range is 10.8V to 40V. The output loop compliance voltage range is 0V to AVDD-2.5V. The circuit also includes a power-on reset function to ensure the device powers on under known conditions. An asynchronous clear pin is also provided to set the output to a zero / intermediate level voltage output or to the lower end of a selected current range.

[0084] Example 3

[0085] like Figure 7 As shown, the analog resistor output circuit uses an electronically simulated synthesized resistor to achieve the output of the thermal resistor; it includes an input operational amplifier A1, a DA converter, an output operational amplifier A2, an inverting amplifier A3, and a standard resistor R0;

[0086] One end of the standard resistor R0 is connected to the positive input port of the input operational amplifier A1, and the other end is connected to the negative input port and the output port of the output operational amplifier A2.

[0087] The negative input port of input operational amplifier A1 is connected to the input port of the DA converter. The output port of the DA converter is connected to the inverting amplifier A3 through resistors R1 and R2 to form a proportional amplifier circuit. The output port of inverting amplifier A3 is connected to the positive input port of output operational amplifier A2.

[0088] from Figure 7 It can be seen that the output resistance of the analog resistor output circuit is R = R0 / (1+K), meaning the standard resistor is attenuated by 1 / (1+K) times. When K = 0, the resistance value remains unchanged; when K = 1.0, the resistance value is halved. By selecting standard resistors R0 with different resistance values, the simulation of RTD signals with different ranges can be achieved.

[0089] The analog resistor output circuit in this embodiment can simulate the signals of Pt100 RTD, Pt1000 RTD, and Cu50 RTD. The resistance value can be customized and optimized according to the user's needs, and the output accuracy can reach ≤0.05%FS.

[0090] The impedance measurement circuit is implemented using a proportional measurement circuit, such as... Figure 8 As shown, the circuit includes a voltage divider resistor R3 and an AD module; one end of the voltage divider resistor R3 is connected to a reference voltage, and the other end is connected to one end of the input impedance Rx and the positive input terminal of the AD module; the other end of the input impedance Rx is grounded; the negative input terminal of the AD module is grounded.

[0091] Figure 8 In this circuit, the reference voltage is the same as that used in the AD module, and the current flowing through the voltage divider resistor R3 and the measured resistor Rx is equal. Therefore, the input impedance Rx and the voltage divider resistor R3 have the following relationship:

[0092] Rx = (UIN / UREF-1) * R3

[0093] Therefore, different ranges can be set using R3 to measure resistances in different ranges.

[0094] like Figure 9 As shown, the power supply circuit includes an AC-DC module, the input terminal of which is connected to the power interface, and the output terminal of which is connected to the DC-DC isolation conversion module and the boost module.

[0095] The AC-DC module is used to convert 220V AC power input through the power interface into 24V DC power and input it to the DC isolation conversion module and the boost module;

[0096] The DC-DC isolation converter module is used to convert 24V DC power to DC voltage, with an output voltage range of -15V to +15V. The converted output voltage is supplied to the main controller module, storage circuit, analog electrical signal acquisition circuit, analog electrical signal output circuit, analog resistance output circuit, impedance measurement circuit, and insulation detection circuit.

[0097] The boost module is used to boost 24V DC to 500V high voltage DC to supply the insulation resistance measurement circuit.

[0098] It should be noted that the ±15V voltage of the DC isolation conversion module supplies the analog electrical signal acquisition circuit, the 24V DC power supplies the insulation detection circuit for boosting, and the commonly used logic voltages such as 3.3V, 5V, 9V and 12V are supplied to the corresponding devices in each circuit.

[0099] In a preferred embodiment, the insulation resistance measurement circuit includes a protection unit, a measurement unit, and a self-test unit; the measurement unit is connected to the protection unit and the self-test unit, the input terminals of the self-test unit and the measurement unit are both connected to the insulation resistance measurement interface, and the output terminals of the self-test unit and the measurement unit are both connected to the main controller module; the input terminal of the protection unit is connected to the power supply circuit, and the output terminal is connected to the measurement unit.

[0100] The self-test unit is used to detect the 500V DC input voltage value when powered on, ensuring that the voltage value is within the preset safety range;

[0101] The protection unit is used to protect the back-end circuitry from damage caused by voltage fluctuations;

[0102] The measurement unit is used to detect the current flowing through the device under test based on 500V high voltage DC power in order to calculate the resistance of the device under test.

[0103] After receiving 220V AC power from an external source, the DC power is first converted to 24V DC power through an isolated AC / DC module. Then, the 24V DC power is boosted to 500V high voltage DC power through an isolated DC / DC boost module. The 500V high voltage DC power output in this way is then output to the back end after passing through the onboard power protection circuit for insulation resistance measurement.

[0104] In actual operation, the insulation resistance measuring circuit will detect the voltage value every time 500V DC power is applied. If the voltage value is high, low, or there is no voltage, the fault indicator light of the high voltage power supply plug will light up red and the specific fault type will be displayed on the display.

[0105] Example 4

[0106] This embodiment also provides a module-level testing method for nuclear reactor instrumentation and control equipment, applied to a module-level testing device for nuclear reactor instrumentation and control equipment as shown in any of the above schemes, including:

[0107] After powering on, the device performs a self-test to confirm that it is in normal working condition.

[0108] Receive test scheme configuration and baseline characteristic data via the display;

[0109] The signal channel was determined according to the test plan configuration, and its normal operation was confirmed by internal DA output and AD signal acquisition.

[0110] When the plug-in under test is detected, the impedance measurement circuit is used to check whether there is a short circuit in the power signal line of the plug-in under test.

[0111] If no power signal short circuit occurs, the data signal impedance is tested through the impedance measurement circuit to determine whether the signal impedance is consistent with the reference characteristic data. If the data is consistent, the test is passed.

[0112] After the test is passed, power on the plug-in under test and perform real-time functional testing on the plug-in under test according to the test plan;

[0113] Summarize and analyze the test data from all tests, output a test report, and disconnect from the plugin under test.

[0114] Furthermore, the test plan configuration includes test type configuration and test execution configuration;

[0115] The test type configuration includes analog signal testing and data acquisition signal testing; the signal flow direction of analog signal testing is from the output of the test device to the device under test, and the signal flow direction of data acquisition signal testing is from the device under test to the test device.

[0116] The test run configuration includes automatic test mode and manual test mode. In automatic test mode, the modular test steps stored in the device are called to perform tests on the device under test. In manual test mode, the test item input interface is provided through the display screen, and the device under test is tested according to the obtained test steps and standards.

[0117] For the automated testing function, users first need to click "Import Test Configuration," select an existing test configuration, and load it into this interface. The various steps of the test configuration will then be displayed on this interface. Manual testing, on the other hand, is designed to facilitate quick testing, allowing users to enter test steps on-site and perform a test.

[0118] It should be noted that the signal value type, signal input channel, and expected input value of the signal need to be set before each test.

[0119] The possible values ​​for the signal value type include floating-point numbers, etc. The signal input channel defines which device channel the signal is acquired from, and the expected input value defines the expected value of the signal at the time of input. When testing response delay, it is also necessary to define time-related settings such as the waiting time for signal retrieval in this step.

[0120] During testing, different test programs are invoked based on the user's selected "test content." Corresponding test programs are written for different test plugins, and after each test is completed, the test data and results are displayed on the main interface. The device automatically determines the test results based on the set input expectations or standards. If a test step fails, the user is clearly notified. Figure 11 As shown, Figure 11 The interface diagram of a typical test project is shown. After the test is completed, the generated test data can be saved by the user to the software's historical data system storage, forming a test record.

[0121] To meet the diverse needs of users, this device offers customization capabilities for test report content. Users can specify the content to be output in the report, which may include test records, test result judgments, test configuration data used in the test, etc. The output content can be presented in tables, plain text, or other formats. The generated test report can be saved directly as a local file or stored in the software's system storage for later retrieval.

[0122] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0123] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A module-level testing device for nuclear reactor safety instrumentation and control equipment, characterized in that, include: The enclosure includes a front panel, a rear panel, and a test module. The front panel has a display screen, below which are the power button and data export interface. On one side of the display screen are test interfaces, including an analog resistance output interface, an impedance measurement interface, an insulation resistance measurement interface, multiple analog electrical signal input interfaces, and an analog electrical signal output interface. The rear panel has a power switch and a power supply interface. The test module is located inside the enclosure and includes a main controller module, as well as storage circuits, analog electrical signal acquisition circuits, analog electrical signal output circuits, analog resistance output circuits, impedance measurement circuits, insulation detection circuits, and power supply circuits connected to the main controller module; the main controller module is also connected to a display screen and a data export interface; The main controller module is used to receive input data from the analog electrical signal acquisition circuit, impedance measurement circuit, and insulation detection circuit, and transmit the data to the display screen after measurement and analysis. It is also used to receive operation commands input through the display screen, send signal output commands to the analog electrical signal output circuit and analog resistance output circuit, save the measurement data to the storage circuit according to the operation commands, and send the measurement data to the data export interface for export. The input terminal of the analog electrical signal acquisition circuit is connected to the corresponding analog electrical signal input interface; The output terminal of the analog electrical signal output circuit is connected to multiple analog electrical signal output interfaces; The output terminal of the analog resistor output circuit is connected to the analog resistor output interface; the input terminal of the impedance measurement circuit is connected to the impedance measurement interface; the input terminal of the insulation detection circuit is connected to the insulation resistance measurement interface; the input terminal of the power supply circuit is connected to the power interface, and the output terminal is connected to each circuit of the test module to provide power to each circuit. The analog electrical signal acquisition circuit is used to acquire and convert the input voltage or current analog signals, and includes a signal conditioning unit, a gain control unit, an active filter unit, an ADC acquisition unit and an opto-isolation unit connected in sequence. The signal conditioning unit provides electrical isolation between the external input signal and the analog electrical signal acquisition circuit, and also converts the input current signal into a voltage signal for input to the gain control unit. The gain control unit controls the gain of the analog voltage signal to ensure that the signal strength meets the preset input range. The active filtering unit removes noise interference from the signal. The ADC acquisition unit converts the analog voltage signal into a digital signal. The opto-isolation unit provides electrical isolation between the analog electrical signal acquisition circuit and the main controller module. The signal conditioning unit includes an optocoupler and a load resistor. One end of the load resistor is connected to the analog electrical signal input interface, and the other end is connected to the output end of the optocoupler. The control end of the optocoupler is electrically connected to the signal output port of the main controller module. The analog electrical signal output circuit uses a first digital-to-analog converter module and a second digital-to-analog converter module for dual-channel control output. The input terminals of both the first digital-to-analog converter module and the second digital-to-analog converter module are connected to the main controller module. The first digital-to-analog converter module is a multi-channel output module used to output analog voltage signals and uses electronic switches to switch signals between different channels. The second digital-to-analog converter module is a single-channel output module used to output analog current signals; The analog resistor output circuit uses an electronically simulated synthesized resistor to achieve the output of the thermal resistor; it includes an input operational amplifier A1, a DA converter, an output operational amplifier A2, an inverting amplifier A3, and a standard resistor R0; One end of the standard resistor R0 is connected to the positive input port of the input operational amplifier A1, and the other end is connected to the negative input port and the output port of the output operational amplifier A2. The negative input port of input operational amplifier A1 is connected to the input port of the DA converter. The output port of the DA converter is connected to the inverting amplifier A3 through resistors R1 and R2 to form a proportional amplifier circuit. The output port of inverting amplifier A3 is connected to the positive input port of output operational amplifier A2.

2. The module-level testing device for nuclear reactor safety instrumentation and control equipment according to claim 1, characterized in that, The first digital-to-analog converter module is a DAC81416 chip; the second digital-to-analog converter module is an AD5422 chip.

3. The module-level testing device for nuclear reactor safety instrumentation and control equipment according to claim 1, characterized in that, The impedance measurement circuit is implemented using a proportional measurement circuit, including a voltage divider resistor R3 and an AD module; One end of the voltage divider resistor R3 is connected to the reference voltage, and the other end is connected to one end of the input impedance Rx and the positive input terminal of the AD module; the other end of the input impedance Rx is grounded; the negative input terminal of the AD module is grounded.

4. The module-level testing device for nuclear reactor safety instrumentation and control equipment according to claim 1, characterized in that, The power supply circuit includes an AC-DC module, the input terminal of which is connected to the power interface, and the output terminal of which is connected to the DC-DC isolation conversion module and the boost module. The AC-DC module is used to convert 220V AC power input through the power interface into 24V DC power and input it to the DC isolation conversion module and the boost module; The DC-DC isolation converter module is used to convert 24V DC power to DC voltage, with an output voltage range of -15V to +15V. The converted output voltage is supplied to the main controller module, storage circuit, analog electrical signal acquisition circuit, analog electrical signal output circuit, analog resistance output circuit, impedance measurement circuit, and insulation detection circuit. The boost module is used to boost 24V DC to 500V high voltage DC to supply the insulation resistance measurement circuit.

5. The module-level testing device for nuclear reactor safety instrumentation and control equipment according to claim 4, characterized in that, The insulation resistance measurement circuit includes a protection unit, a measurement unit, and a self-test unit; the measurement unit is connected to the protection unit and the self-test unit, the input terminals of the self-test unit and the measurement unit are both connected to the insulation resistance measurement interface, and the output terminals of the self-test unit and the measurement unit are both connected to the main controller module; the input terminal of the protection unit is connected to the power supply circuit, and the output terminal is connected to the measurement unit. The self-test unit is used to detect the 500V DC input voltage value when powered on, ensuring that the voltage value is within the preset safety range; The protection unit is used to protect the back-end circuitry from damage caused by voltage fluctuations; The measurement unit is used to detect the current flowing through the device under test based on 500V high voltage DC power in order to calculate the resistance of the device under test.

6. A module-level testing method for nuclear reactor safety instrumentation and control equipment using the apparatus described in any one of claims 1 to 5, characterized in that, Includes the following steps: After powering on, the device performs a self-test to confirm that it is in normal working condition. Receive test scheme configuration and baseline characteristic data via the display; The signal channel was determined according to the test plan configuration, and its normal operation was confirmed by internal DA output and AD signal acquisition. When the plug-in under test is detected, the impedance measurement circuit is used to check whether there is a short circuit in the power signal line of the plug-in under test. If no power signal short circuit occurs, the data signal impedance is tested through the impedance measurement circuit to determine whether the signal impedance is consistent with the reference characteristic data. If the data is consistent, the test is passed. After the test is passed, power on the plug-in under test and perform real-time functional testing on the plug-in under test according to the test plan; Summarize and analyze the test data from all tests, output a test report, and disconnect from the plugin under test.

7. The module-level testing method for nuclear reactor safety instrumentation and control equipment according to claim 6, characterized in that, The test plan configuration includes test type configuration and test execution configuration; The test type configuration includes analog signal testing and data acquisition signal testing; the signal flow direction of analog signal testing is from the output of the test device to the device under test, and the signal flow direction of data acquisition signal testing is from the device under test to the test device. The test run configuration includes automatic test mode and manual test mode. In automatic test mode, the modular test steps stored in the device are called to perform tests on the device under test. In manual test mode, the test step input interface is provided through the display screen, and the device under test is tested according to the obtained test steps.

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