Module-level testing device and testing method for nuclear reactor safety instrument control equipment

Abstract

The invention relates to the field of nuclear reactor safety instrument control, in particular to a module-level testing device and method for nuclear reactor safety instrument control equipment. The device comprises a box body which is provided with a front panel, a rear panel and a test module; the test module is arranged in the box body and comprises a main controller module, and a storage circuit, an analog electric signal acquisition circuit, an analog electric signal output circuit, an analog resistance output circuit, an impedance measurement circuit, an insulation detection circuit and a power supply circuit which are connected with the main controller module; and the master controller module is also connected with the display screen and the data export interface. Test items can be freely added and modified according to the to-be-tested equipment and test requirements, all modules of the nuclear reactor safety instrument control equipment are comprehensively tested, high-integration and modular design can be achieved, the portability of the equipment is improved, and the test efficiency and accuracy are improved.

Description

Technical Field

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

[0002] A nuclear reactor is a highly complex and energy-intensive system used to start, control and maintain a nuclear fission or nuclear fusion chain reaction. Although many safety measures have been taken in the design of nuclear reactors, due to the particularity of nuclear energy, even a small failure in the operation of the system may lead to catastrophic consequences. The safety instrumentation and control equipment of the reactor is a key equipment used to monitor, control and protect the safe operation of the nuclear reactor. It is closely connected with other systems of the reactor (such as the cooling system, the nuclear reactor body, the control rod system, etc.) to ensure that the reactor always operates within a safe range, thereby minimizing the risks brought by the use of nuclear energy and protecting public health and environmental safety. It can be seen that the testing accuracy of safety instrumentation and control equipment is crucial.

[0003] Existing nuclear reactor safety-critical instrumentation and control equipment usually consists of multiple complex modules that are independent of each other but work closely together. Various sensors are used to monitor the key parameters of the reactor in real time. When dangerous signals are detected or the reactor operation is abnormal, the emergency shutdown is quickly initiated through relays to interrupt the nuclear fission reaction and quickly reduce the reactor power. In actual applications, some modules may fail. Module-level testing can verify whether the system has a good fault isolation mechanism to prevent the propagation of faults and affect other modules or systems. However, the existing test equipment fails to fully consider the smoothness and real-time nature of the interaction between operators and equipment, resulting in difficulties in operation during the test process. 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 to be tested and test requirements, and conduct comprehensive tests on various modules of the nuclear reactor safety instrumentation and control equipment, so as to achieve highly integrated and modular design, enhance the portability of the equipment, and improve the test efficiency and accuracy.

[0005] The present invention provides a module-level test device for nuclear reactor safety instrumentation and control equipment, comprising: a box body, the box body being provided with a front panel, a rear panel and a test module;

[0006] A display screen is provided on the front panel, a power button and a data export interface are provided below the display screen, and a test interface is provided on one side of the display screen; the test interface includes an analog resistance output interface, an impedance measurement interface, an insulation resistance measurement interface, multiple analog electrical signal input interfaces and analog electrical signal output interfaces; a power switch and a power supply interface are provided on the rear panel;

[0007] The test module is arranged inside the box, including a main controller module, and 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 and the data export interface;

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

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

[0010] In a specific embodiment of the present invention, the analog electrical signal acquisition circuit is used to perform data acquisition and data conversion on 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 a photoelectric isolation unit connected in sequence;

[0011] The signal conditioning unit is used to electrically isolate the external input signal from the analog electrical signal acquisition circuit, and is also used to convert the input current signal into a voltage signal and input it into the gain control unit; the gain control unit is used to perform gain control on the analog voltage signal so that the signal strength meets the preset input range; the active filter unit is used to remove noise interference in the signal; the ADC acquisition unit is used to convert the analog voltage signal into a digital signal; the photoelectric isolation unit is used to achieve electrical isolation between the analog electrical signal acquisition circuit and the main controller module;

[0012] Among them, the signal conditioning unit includes a photocoupler 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 photocoupler, and the control end of the photocoupler is electrically connected to the signal output port of the main controller module.

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

[0014] The first digital-to-analog conversion module is a multi-channel output module for outputting analog voltage signals and using electronic switches to implement signal switching between different channels;

[0015] The second digital-to-analog conversion module is a single-channel output module for outputting an analog current signal.

[0016] In a specific implementation 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 a specific embodiment of the present invention, the analog resistance output circuit uses electronic analog synthetic resistance to realize thermal resistance output; it includes input operational amplifier A1, DA converter, output operational amplifier A2, inverting amplifier A3 and 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 the input operational amplifier A1 is connected to the input end of the DA converter, and the output end of the DA converter forms a proportional amplifier circuit with the inverting amplifier A3 through resistors R1 and R2; the output end of the inverting amplifier A3 is connected to the positive input port of the output operational amplifier A2.

[0020] In a 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-dividing 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 end of the AD module; the other end of the input impedance Rx is grounded; and the negative input end of the AD module is grounded.

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

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

[0024] The DC isolation conversion module is used to convert 24V DC power into DC voltage, and the output voltage range is -15V to +15V, and the converted output voltage is provided 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 and provide it to the insulation resistance measurement circuit.

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

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

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

[0029] The measuring unit is used to detect the current flowing through the device under test based on 500V high voltage direct current to calculate the resistance value of the device under test.

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

[0031] After power-on, perform a self-test on the device to ensure that it is in normal working condition;

[0032] receiving test plan configuration and benchmark characterization data via a display;

[0033] Determine the signal channel according to the test plan configuration, and confirm that the signal channel is working properly through internal DA output and AD signal acquisition;

[0034] When it is detected that the tested plug-in is connected, the impedance measurement circuit is used to detect whether the power signal line of the tested plug-in is short-circuited;

[0035] If the power signal is not short-circuited, the data signal impedance test is performed 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 passes;

[0036] After the test passes, the plug-in under test is powered on, and a real-time functional test is performed on the plug-in under test according to the test plan;

[0037] Summarize the test data of each test and analyze it, output the test report, and disconnect the connection with the plug-in under test.

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

[0039] The test type configuration includes analog signal test and sampling signal test; the signal flow direction of analog signal test is from the test device to the device under test, and the signal flow direction of sampling signal test is from the device under test to the test device;

[0040] The test operation 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, a test step entry interface is provided through the display screen, and the device under test is tested according to the acquired test steps.

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

[0042] 1. The device is simple in design. The operator 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, which is conducive to the centralized management and operation of the equipment. The integrated and modular settings improve the convenience and real-time performance of the operation.

[0043] 2. Provide comprehensive testing for signal acquisition and output. The testing content provided by this device mainly includes the accuracy of the isolator signal, input and output impedance, insulation impedance, response time, power consumption status, etc., all of which are in the form of independent interfaces, which is convenient for users to connect. Users can test according to the model or type of the module under test.

[0044] 3. Through a unified control unit, the input data from each circuit is received and analyzed, and corresponding operation instructions are generated for control and adjustment, making the data processing in the test process more efficient and accurate. This ensures the real-time display of data and its later storage and export, and improves the transparency and traceability of the test process.

[0045] 4. Through software configuration and hardware configuration, you can freely add, modify, and delete test items according to the specifications of the product to be tested, and edit the test and judgment parameters of each test item. You can also choose to start the test function with one button to realize automatic testing of various functions, store relevant inspection and detection data, and output standard reports.

[0046] 5. As an open system, users can add and adjust hardware equipment to expand the test functions of the automatic test system. The report format can be edited according to the format requirements of the test report.

[0047] 6. Highly integrated and automated, with a friendly human-machine interface, adjustable test items and parameters, it also provides reliability analysis of safety-level isolation components and formulates corresponding preventive maintenance strategies.

[0048] The device of the present invention provides comprehensive detection of signal acquisition and output, supports independent testing of multiple indicators such as accuracy, impedance, response time, power consumption, etc., is convenient to connect with different modules, and meets diverse testing needs. The unified control unit can efficiently receive and analyze data, and generate precise operating instructions to ensure the real-time display, storage and export of test data, and enhance the transparency and traceability of the test process. At the same time, the system supports flexible configuration. Users can freely add and modify test items according to the specifications of the product to be tested, set judgment parameters, and realize automated testing, reduce human intervention, and improve test efficiency and accuracy. As an open system, users can also expand hardware equipment and adjust test functions as needed, and customize report output, further enhancing the flexibility and scalability of the system. In addition, the device has a friendly human-machine interface, and the safety isolation card provides reliability analysis, and preventive maintenance strategies can be formulated to ensure the long-term stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0050] Figure 2 A schematic diagram of a back panel of a test device is provided for the present invention;

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

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

[0053] Figure 5 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 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 resistance output circuit provided by the present invention;

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

[0057] Fig. 9 A schematic diagram of the power supply circuit structure provided by the present invention;

[0058] Fig.10 A schematic flow chart of a module-level testing method for a nuclear reactor instrumentation and control equipment provided by the present invention;

[0059] Fig.11 A schematic diagram of the test item interface provided by the present invention;

[0060] In the figure, 1- cabinet, 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 DESCRIPTION

[0061] In order to further understand the present invention, the embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the present invention.

[0062] Example 1

[0063] See also Figure 1 The module-level test device of the nuclear reactor instrumentation and control equipment provided in this embodiment includes a box body 1, and the box body 1 is provided with a front panel 2, a rear panel 3 and a test module 4;

[0064] A display screen 5 is provided on the front panel 2, a power button 6 and a data export interface 7 are provided below the display screen 5, and a test interface 8 is provided 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, a plurality of analog electrical signal input interfaces 12 and an analog electrical signal output interface 13; Figure 2 As shown, the rear panel 2 is provided with a power switch 14 and a power supply interface 15;

[0065] The test module 4 is arranged inside the box 1. Figure 3 As shown, the test module 4 includes a main controller module, and 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, the impedance measurement circuit and the insulation detection circuit, measure and analyze the data and transmit it to the display screen for display; it is also used to receive operation instructions input through the display screen, and send signal output instructions to the analog electrical signal output circuit and the analog resistance output circuit, save the measurement data to the storage circuit according to the operation instructions, and send the measurement data to the data export interface for export;

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

[0068] The concise design proposed in this embodiment facilitates operators to input test instructions, export test data through the data export interface, and perform corresponding equipment tests through different test interfaces, which is conducive to the centralized management and operation of the equipment. Through the integrated and modular settings, the convenience and real-time performance of the operation are improved. The detection content provided by this device mainly includes the accuracy of the isolator signal, input and output impedance, insulation impedance, response time, power consumption status, etc., all of which are in the form of independent interfaces, which is convenient for users to connect. Users can connect according to the model or type of the module under test. Through a unified control unit, the input data from each circuit is received and analyzed, and the corresponding operation instructions are generated, and control and adjustment are performed, so that the data processing during the test process is more efficient and accurate. The real-time display and later storage and export of data are ensured, and the transparency and traceability of the test process are improved.

[0069] Specifically, in order to increase the portability of the device, the device is designed as a portable hand-held case (size 400mm×310mm×130mm (length×height×depth)), weighing no more than 10kg, with a carrying handle on the top of the case, which is convenient for users to carry to the site for use. The four corners of the case are designed to be rounded to avoid sharp protruding parts. At the same time, protective covers are installed at parts prone to impact (four corners, etc.) to prevent damage to the equipment during transportation. The device can perform power-off online monitoring of on-site equipment without disassembling the on-site equipment, and will not cause destructive damage to the isolation card during the detection process.

[0070] The data export interface is a USB port and a LAN interface. Users can use an external mouse and keyboard for human-computer interaction and export and transfer test data.

[0071] Example 2

[0072] The analog electrical signal acquisition circuit is used to collect and convert the input voltage or current analog signal. 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 a photoelectric isolation unit which are connected in sequence;

[0073] The signal conditioning unit is used to electrically isolate the external input signal from the analog electrical signal acquisition circuit, and is also used to convert the input current signal into a voltage signal and input it into the gain control unit; the gain control unit is used to perform gain control on the analog voltage signal so that the signal strength meets the preset input range; the active filter unit is used to remove noise interference in the signal; the ADC acquisition unit is used to convert the analog voltage signal into a digital signal; the photoelectric isolation unit is used to achieve electrical isolation between the analog electrical signal acquisition circuit and the main controller module;

[0074] The front-end conditioning of analog input signals not only includes signal conditioning, but also realizes the conversion of current and voltage acquisition in the front-end conditioning circuit for signal acquisition in the current mode. That is, in the acquisition and processing process of the back-end circuit, the voltage signal is actually processed. ESD static treatment measures are also taken to effectively prevent static electricity from damaging the entire acquisition channel.

[0075] Among them, Figure 5 As shown, the signal conditioning unit includes a photocoupler 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 photocoupler, and the control end of the photocoupler is electrically connected to the signal output port of the main controller module.

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

[0077] In order to further improve the integration of the device, the ADC acquisition circuit uses ADI's AD7610, the input range and working mode of which can be configured through hardware or a dedicated write-only serial configuration port. The AD7610 has a built-in 16-bit high-speed sampling ADC, an internal conversion clock, an internal reference voltage source (with buffer), an error correction circuit, and serial and parallel system interface ports. The use of AD7610 can further simplify the design, improve the stability of the device, ensure normal operation in complex and harsh environments, and perform well in scenarios requiring high precision and high reliability of nuclear reactor safety instrumentation and control equipment.

[0078] The analog electrical signal output circuit uses a first digital-to-analog conversion module and a second digital-to-analog conversion module to perform dual-channel control output, and the input ends of the first digital-to-analog conversion module and the second digital-to-analog conversion module are both connected to the main controller module;

[0079] The first digital-to-analog conversion module is a multi-channel output module for outputting analog voltage signals and using electronic switches to implement signal switching between different channels;

[0080] The second digital-to-analog conversion module is a single-channel output module for outputting an analog current signal.

[0081] like Figure 6 As shown, the first digital-to-analog conversion module DA1 is designed with 16 channels, and cooperates with electronic switches to realize the switching of signals between channels, and finally outputs the signal to the board under test through the wiring network. DA1 can output 0V~10V voltage signal; the second digital-to-analog conversion module is used to output 0mA~20mA current signal.

[0082] Specifically, the first digital-to-analog conversion module is a DAC81416 chip; the second digital-to-analog conversion module is an AD5422 chip. The DA1 analog output chip uses TI's DAC81416, which is a 16-channel 16-bit DAC chip with an output voltage range of up to 40V and a drive current of ±25mA, which can meet the needs of users. The DA2 analog output chip uses Analog Devices' AD5422, which is a precise, 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. After testing, the current output range of this device is 0-20mA, with an accuracy of ≤0.05%FS; the voltage output range is 0-10V, with an accuracy of ≤0.05%FS.

[0083] Furthermore, the analog electrical signal output circuit also has short-circuit and open-circuit protection and can drive a capacitive load of 1μF. The AVDD operating voltage range of the device 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 that the device is powered on in a known state. An asynchronous clear pin is also provided to set the output to a zero-level / mid-level voltage output or to set the output to the low end of the selected current range.

[0084] Example 3

[0085] like Figure 7 As shown, the analog resistance output circuit uses electronic analog synthetic resistance to realize thermal resistance output; it includes input operational amplifier A1, DA converter, output operational amplifier A2, inverting amplifier A3 and 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 the input operational amplifier A1 is connected to the input end of the DA converter, and the output end of the DA converter forms a proportional amplifier circuit with the inverting amplifier A3 through resistors R1 and R2; the output end of the inverting amplifier A3 is connected to the positive input port of the output operational amplifier A2.

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

[0089] The analog resistance output circuit of this embodiment can realize the signal simulation of Pt100 thermistor, Pt1000 thermistor, and Cu50 thermistor. The resistance value can be customized and optimized according to user needs, and can meet the output accuracy requirement of ≤0.05% FS.

[0090] The impedance measurement circuit is implemented using a ratiometric measurement circuit, such as Figure 8 As shown, the circuit includes a voltage-dividing resistor R3 and an AD module; one end of the voltage-dividing 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 end of the AD module; the other end of the input impedance Rx is grounded; and the negative input end of the AD module is grounded.

[0091] Figure 8 In the reference voltage, the reference voltage is the same as that of 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 by R3 to measure resistances in different ranges.

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

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

[0096] The DC isolation conversion module is used to convert 24V DC power into DC voltage, and the output voltage range is -15V to +15V, and the converted output voltage is provided 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 and provide it to the insulation resistance measurement circuit.

[0098] It should be noted that the ±15V voltage of the DC isolation conversion module is supplied to the analog electrical signal acquisition circuit, the 24V DC power is supplied to 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 of each circuit.

[0099] As 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 ends of the self-test unit and the measurement unit are both connected to the insulation resistance measurement interface, and the output ends are both connected to the main controller module, the input end of the protection unit is connected to the power supply circuit, and the output end is connected to the measurement unit;

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

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

[0102] The measuring unit is used to detect the current flowing through the device under test based on 500V high voltage direct current to calculate the resistance value of the device under test.

[0103] After receiving 220V AC power from the outside, the DC power is first converted into 24V DC power through the isolated AC / DC module, and then the 24V DC power is boosted to 500V high-voltage DC power through the 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 on-board power protection circuit for insulation resistance measurement.

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

[0105] Example 4

[0106] This embodiment further provides a module-level testing method for a nuclear reactor instrumentation and control device, which is applied to a module-level testing device for a nuclear reactor instrumentation and control device shown in any of the above schemes, and includes:

[0107] After power-on, perform a self-test on the device to ensure that it is in normal working condition;

[0108] receiving test plan configuration and benchmark characterization data via a display;

[0109] Determine the signal channel according to the test plan configuration, and confirm that the signal channel is working properly through internal DA output and AD signal acquisition;

[0110] When it is detected that the tested plug-in is connected, the impedance measurement circuit is used to detect whether the power signal line of the tested plug-in is short-circuited;

[0111] If the power signal is not short-circuited, the data signal impedance test is performed 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 passes;

[0112] After the test passes, the plug-in under test is powered on, and a real-time functional test is performed on the plug-in under test according to the test plan;

[0113] Summarize the test data of each test and analyze it, output the test report, and disconnect the connection with the plug-in under test.

[0114] Furthermore, the test scheme configuration includes a test type configuration and a test run configuration;

[0115] The test type configuration includes analog signal test and sampling signal test; the signal flow direction of analog signal test is from the test device to the device under test, and the signal flow direction of sampling signal test is from the device under test to the test device;

[0116] The test operation 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, a test item entry interface is provided through the display screen, and the device under test is tested according to the acquired test steps and standards.

[0117] For the automatic test function, the user first needs to click "Import Test Configuration", select a created test configuration, and load it into this interface, where each step of the test configuration will be displayed. The manual test is used to facilitate users to conduct quick tests, and users can enter each test step configuration on site to conduct a test.

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

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

[0120] During the test, different test programs are called according to the "test content" selected by the user, and corresponding test programs are written for different test plug-ins. After each test in the test program is completed, the test data and results are displayed in the main interface. The device automatically determines the test results based on the set input expected value or set standard. If the test result of a certain step fails, the user will be prompted in a striking manner. Fig.11 As shown, Fig.11 A typical test project interface diagram is shown. When the test is completed, the generated test data can be saved by the user to the software's historical data system storage to form a test record.

[0121] In order to meet the needs of different users, this device provides the ability to customize the 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 expressed in tables, ordinary text, etc. In addition to being saved directly as a local file, the generated test report can also be saved to the system storage of the software for direct access next time.

[0122] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0123] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A module-level test device for nuclear reactor safety instrumentation and control equipment, characterized in that: include: A box body, wherein the box body is provided with a front panel, a rear panel and a test module; A display screen is provided on the front panel, a power button and a data export interface are provided below the display screen, and a test interface is provided on one side of the display screen; the test interface includes an analog resistance output interface, an impedance measurement interface, an insulation resistance measurement interface, multiple analog electrical signal input interfaces and analog electrical signal output interfaces; a power switch and a power supply interface are provided on the rear panel; The test module is arranged inside the box, including a main controller module, and 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 and the data export interface; The main controller module is used to receive input data from the analog electrical signal acquisition circuit, the impedance measurement circuit and the insulation detection circuit, measure and analyze the data and transmit it to the display screen for display; it is also used to receive operation instructions input through the display screen, and send signal output instructions to the analog electrical signal output circuit and the analog resistance output circuit, save the measurement data to the storage circuit according to the operation instructions, and send the measurement data to the data export interface for export; The input end of the analog electrical signal acquisition circuit is connected to the corresponding analog electrical signal input interface; The output end of the analog electrical signal output circuit is connected to a plurality of analog electrical signal output interfaces; The output end of the analog resistance output circuit is connected to the analog resistance output interface; the input end of the impedance measurement circuit is connected to the impedance measurement interface; the input end of the insulation detection circuit is connected to the insulation resistance measurement interface; the input end of the power supply circuit is connected to the power supply interface, and the output end is connected to each circuit of the test module, so as to provide power for each circuit.

2. The module-level testing device for nuclear reactor safety instrumentation and control equipment according to claim 1, characterized in that: The analog electrical signal acquisition circuit is used to perform data acquisition and data conversion on 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 a photoelectric isolation unit connected in sequence; The signal conditioning unit is used to electrically isolate the external input signal from the analog electrical signal acquisition circuit, and is also used to convert the input current signal into a voltage signal and input it into the gain control unit; the gain control unit is used to perform gain control on the analog voltage signal so that the signal strength meets the preset input range; the active filter unit is used to remove noise interference in the signal; the ADC acquisition unit is used to convert the analog voltage signal into a digital signal; the photoelectric isolation unit is used to achieve electrical isolation between the analog electrical signal acquisition circuit and the main controller module; Among them, the signal conditioning unit includes a photocoupler 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 photocoupler, and the control end of the photocoupler is electrically connected to the signal output port of the main controller module.

3. The module-level testing device for nuclear reactor safety instrumentation and control equipment according to claim 1, characterized in that: The analog electrical signal output circuit uses a first digital-to-analog conversion module and a second digital-to-analog conversion module to perform dual-channel control output, and the input ends of the first digital-to-analog conversion module and the second digital-to-analog conversion module are both connected to the main controller module; The first digital-to-analog conversion module is a multi-channel output module for outputting analog voltage signals and using electronic switches to implement signal switching between different channels; The second digital-to-analog conversion module is a single-channel output module for outputting an analog current signal.

4. The module-level testing device for nuclear reactor safety instrumentation and control equipment according to claim 3, characterized in that: The first digital-to-analog conversion module is a DAC81416 chip; the second digital-to-analog conversion module is an AD5422 chip.

5. The module-level testing device for nuclear reactor safety instrumentation and control equipment according to claim 1, characterized in that: The analog resistance output circuit uses electronic analog synthetic resistance to realize thermal resistance output; it includes input operational amplifier A1, DA converter, output operational amplifier A2, inverting amplifier A3 and 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 the input operational amplifier A1 is connected to the input end of the DA converter, and the output end of the DA converter forms a proportional amplifier circuit with the inverting amplifier A3 through resistors R1 and R2; the output end of the inverting amplifier A3 is connected to the positive input port of the output operational amplifier A2.

6. 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 by a proportional measurement circuit, including a voltage divider resistor R3 and an AD module; One end of the voltage-dividing 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 end of the AD module; the other end of the input impedance Rx is grounded; and the negative input end of the AD module is grounded.

7. 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 end of the AC-DC module is connected to the power interface, and the output end is connected to the DC isolation conversion module and the boost module; The AC-DC module is used to convert the 220V AC power connected through the power interface into 24V DC power and input it into the DC isolation conversion module and the boost module; The DC isolation conversion module is used to convert 24V DC power into DC voltage, and the output voltage range is -15V to +15V, and the converted output voltage is provided 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 and provide it to the insulation resistance measurement circuit.

8. The module-level testing device for nuclear reactor safety instrumentation and control equipment according to claim 1, characterized in that: The insulation resistance measurement circuit comprises a protection unit, a measurement unit and a self-test unit; the insulation resistance measurement circuit comprises 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 ends of the self-test unit and the measurement unit are both connected to the insulation resistance measurement interface, and the output ends are both connected to the main controller module, the input end of the protection unit is connected to the power supply circuit, and the output end is connected to the measurement unit; The self-test unit is used to test the 500V DC input voltage value when powered on to ensure that the voltage value is within the preset safety range; The protection unit is used to protect the back-end circuit from damage caused by voltage fluctuations; The measuring unit is used to detect the current flowing through the device under test based on 500V high voltage direct current to calculate the resistance value of the device under test.

9. A module-level testing method for nuclear reactor safety instrumentation and control equipment, characterized in that: The following steps are involved: After power-on, perform a self-test on the device to ensure that it is in normal working condition; receiving test plan configuration and benchmark characterization data via a display; Determine the signal channel according to the test plan configuration, and confirm that the signal channel is working properly through internal DA output and AD signal acquisition; When it is detected that the tested plug-in is connected, the impedance measurement circuit is used to detect whether the power signal line of the tested plug-in is short-circuited; If the power signal is not short-circuited, the data signal impedance test is performed 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 passes; After the test passes, the plug-in under test is powered on, and a real-time functional test is performed on the plug-in under test according to the test plan; Summarize the test data of each test and analyze it, output the test report, and disconnect the connection with the plug-in under test.

10. The module-level testing method for nuclear reactor safety instrumentation and control equipment according to claim 9, characterized in that: The test scheme configuration includes test type configuration and test run configuration; The test type configuration includes analog signal test and sampling signal test; the signal flow direction of analog signal test is from the test device to the device under test, and the signal flow direction of sampling signal test is from the device under test to the test device; The test operation 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, a test step entry interface is provided through the display screen, and the device under test is tested according to the acquired test steps.

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