General testing device for nuclear power station relay clamping piece

Abstract

The utility model relates to a general testing device for a relay clamping piece of a nuclear power station. The general testing device comprises a cabinet, and an excitation signal output module, an excitation signal acquisition module, a clamping piece adapter and a response signal acquisition module which are arranged in the cabinet, the card adapter is used for adapting to different types of relay cards and transmitting the excitation signal output by the excitation signal output module to the relay cards; the excitation signal acquisition module is used for acquiring an excitation signal, and the response signal acquisition module is used for acquiring a response signal of the relay card in response to the excitation signal; the excitation signal output module comprises an alternating current output unit, an alternating voltage output unit, a direct current adjustable voltage output unit and a switching power supply unit. The universal testing device can meet the testing requirements of various types of relay cards, the development cost and the maintenance cost of the testing device are reduced, the input of repeated resources is avoided, and the utilization rate and the testing efficiency of the testing device are improved.

Description

Technical Field

[0001] This utility model relates to the field of relay card testing technology, and in particular to a universal testing device for nuclear power plant relay cards. Background Technology

[0002] Nuclear power plants are complex systems requiring numerous electrical devices to control and protect various circuits and equipment. Relay cards are a crucial component. Common switching devices in power systems, relay cards control high-power currents through electromagnetic induction. They detect faults and anomalies in the electrical system and take timely measures to protect equipment from damage. Failures in nuclear power plant relay cards can have a significant impact on the plant's safety. When a relay card malfunctions, it can lead to short circuits, overloads, and other problems, causing equipment damage or failure, and even potentially causing reactor runaway and other safety incidents. Relay card malfunctions can also cause signal transmission problems or failures, affecting the coordination and operation between systems.

[0003] Currently, nuclear power plants primarily rely on manual testing for relay cards. Manual testing is susceptible to operator subjectivity, potentially leading to misjudgments, missed detections, and even damage to the cards due to improper operation. Manual testing is time-consuming and labor-intensive, resulting in low efficiency and failing to meet the needs of industrialized production and modern management. Therefore, there is an urgent need to design a device capable of automatically testing relay cards. However, nuclear power plants utilize various types of relay cards, and developing a separate testing device for each type would be prohibitively expensive. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a universal testing device for nuclear power plant relay cards.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A universal testing device for nuclear power plant relay cards is provided, comprising: a cabinet, and an excitation signal output module, an excitation signal acquisition module, a card adapter, and a response signal acquisition module disposed within the cabinet; the excitation signal acquisition module is connected between the excitation signal output module and the card adapter, and the response signal acquisition module is connected to the card adapter; the card adapter is used to adapt to different types of relay cards and transmit the excitation signal output by the excitation signal output module to the relay card; the excitation signal acquisition module is used to acquire the excitation signal, and the response signal acquisition module is used to acquire the response signal of the relay card in response to the excitation signal; wherein, the excitation signal output module includes an AC current output unit, an AC voltage output unit, a DC adjustable voltage output unit, and a switching power supply unit, and the excitation signal includes at least one of an AC current signal, an AC voltage signal, a DC adjustable voltage signal, and a switching power supply signal.

[0006] Furthermore, the excitation signal acquisition module includes an analog input board, which is used to acquire the AC current signal output by the AC current output unit; the A-phase output terminal of the AC current output unit is connected to the card adapter through the first channel of the analog input board, the B-phase output terminal of the AC current output unit is connected to the card adapter through the first channel of the analog input board, the neutral line output terminal of the AC current output unit is connected to the card adapter; the response signal acquisition module includes a distributed measurement and control board, which is connected to the card adapter and is used to acquire the response signal of the relay card in response to the AC current signal.

[0007] Furthermore, the excitation signal acquisition module includes a temperature and humidity measurement and control board, which is used to acquire the AC voltage signal output by the AC voltage output unit; the first output terminal of the AC voltage output unit is connected to the card adapter through the first channel of the temperature and humidity measurement and control board, and the second output terminal of the AC voltage output unit is connected to the card adapter; the response signal acquisition module includes a distributed measurement and control board, which is connected to the card adapter and is used to acquire the response signal of the relay card in response to the AC voltage signal.

[0008] Furthermore, the excitation signal acquisition module includes a temperature and humidity measurement and control board, which is used to acquire the DC adjustable voltage signal output by the DC adjustable voltage output unit; the positive output terminal of the DC adjustable voltage output unit is connected to the card adapter through the second channel of the temperature and humidity measurement and control board, and the negative output terminal of the DC adjustable voltage output unit is connected to the card adapter; the response signal acquisition module includes a distributed measurement and control board, which is connected to the card adapter and is used to acquire the response signal of the relay card in response to the DC adjustable voltage signal.

[0009] Furthermore, the excitation signal acquisition module includes a temperature and humidity measurement and control board, which is used to acquire the switching power supply signal output by the switching power supply unit; the response signal acquisition module includes a switch input board, which is used to acquire the response signal of the relay card in response to the switching power supply signal; the positive output terminal of the switching power supply unit is connected to the card adapter through the third channel of the temperature and humidity measurement and control board, and each of the four channels of the switch input board is provided with an optocoupler. The cathodes of the diodes in the four optocouplers form a common cathode, which is connected to the negative output terminal of the switching power supply unit, and the anodes of the four diodes are respectively connected to the card adapter.

[0010] Furthermore, the cabinet is also equipped with a front-end processor; the front-end processor is communicatively connected to the AC current output unit, the AC voltage output unit, the DC adjustable voltage output unit and the switching power supply unit respectively, and is used to receive externally input test cases and control the start and stop of the AC current output unit, the AC voltage output unit, the DC adjustable voltage output unit and the switching power supply unit according to the test cases.

[0011] Furthermore, the cabinet is also equipped with a switch; the front-end server issues instructions to the excitation signal output module, the excitation signal acquisition module and the response signal acquisition module based on the switch, and the excitation signal acquisition module and the response signal acquisition module upload the acquired data to the front-end server based on the switch.

[0012] Furthermore, an AC output board is connected between the AC voltage output unit and the card adapter; the first output terminal of the AC voltage output unit is connected to the card adapter through the first channel of the AC output board, and the second output terminal of the AC voltage output unit is connected to the card adapter through the second channel of the AC output board; a main control board is also provided in the cabinet, which is connected to the first channel and the second channel of the AC output board respectively, and the timing of the AC voltage signal is adjusted by controlling the on / off state of the first channel and the second channel of the AC output board.

[0013] Furthermore, a switch output board is connected between the DC adjustable voltage output unit and the card adapter; the positive output terminal of the DC adjustable voltage output unit is connected to the card adapter through the first channel of the switch output board, and the negative output terminal of the DC adjustable voltage output unit is connected to the card adapter through the second channel of the switch output board; a main control board is also provided in the cabinet, which is connected to the first channel and the second channel of the switch output board respectively, and the timing of the DC adjustable voltage signal is adjusted by controlling the on / off state of the first channel and the second channel of the switch output board.

[0014] Furthermore, the AC current signal is a three-phase AC current, the AC voltage signal has a voltage range of 5 to 500VAC, the DC adjustable voltage signal has a voltage range of 24 to 250VDC, and the switching power supply signal has a voltage of 24V.

[0015] The present invention has the following advantages: By adapting to different types of relay cards through the card adapter, the AC current output unit, AC voltage output unit, DC adjustable voltage output unit and switching power supply unit can provide the required excitation signals for different types of relay cards. This universal test device can adapt to the test requirements of various types of relay cards, reduce the development cost and maintenance cost of the test device, avoid redundant resource investment, and improve the utilization rate and test efficiency of the test device. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0017] Figure 1 This is a structural block diagram of a universal testing device for nuclear power plant relay cards according to an embodiment of this utility model;

[0018] Figure 2 This is a connection diagram of a universal testing device for nuclear power plant relay cards according to an embodiment of this utility model. Detailed Implementation

[0019] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] like Figure 1 As shown, in one embodiment of this utility model, a universal testing device for nuclear power plant relay cards includes: a cabinet 300, and an excitation signal output module 210, an excitation signal acquisition module 220, a card adapter 230, and a response signal acquisition module 240 disposed within the cabinet 300. The excitation signal acquisition module 220 is connected between the excitation signal output module 210 and the card adapter 230, and the response signal acquisition module 240 is connected to the card adapter 230. The card adapter 230 is used to adapt to different types of relay cards 100, transmitting the excitation signal output by the excitation signal output module 210 to the relay card. The excitation signal acquisition module 220 is used to acquire the excitation signal, and the response signal acquisition module 240 is used to acquire the response signal of the relay card in response to the excitation signal. The excitation signal output module 210 includes an AC current output unit, an AC voltage output unit, a DC adjustable voltage output unit, and a switching power supply unit. The excitation signal includes at least one of an AC current signal, an AC voltage signal, a DC adjustable voltage signal, and a switching power supply signal.

[0021] Specifically, the AC current output unit outputs AC current signals, the AC voltage output unit outputs AC voltage signals, the DC adjustable voltage output unit outputs DC adjustable voltage signals, and the switching power supply unit outputs switching power supply signals. The card adapter 230 is compatible with various relay cards, including time relays, overcurrent relays, frequency relays, and undervoltage relays. By connecting various types of relay cards to the card adapter 230, the input excitation signal is conditioned and connected to the corresponding input pin of the card under test, providing a reliable and stable power signal for the relay card testing. The excitation signal required for time relays includes a DC adjustable voltage signal; some time relays also require a switching power supply signal. The excitation signal required for overcurrent relays includes an AC current signal. The excitation signal required for frequency relays includes an AC voltage signal. The excitation signal required for undervoltage relays includes a DC adjustable voltage signal.

[0022] An excitation signal is input to the relay card, energizing it and causing it to generate a response signal. The response signal acquisition module 240 acquires the response signal from the relay card; by analyzing the response signal, fault diagnosis tests and fault type identification can be performed on the relay card. The excitation signal acquisition module 220 acquires the excitation signal provided to the relay card and also verifies the excitation signal to ensure the accuracy of the test results.

[0023] The universal test apparatus of this embodiment can adapt to the testing needs of various types of relay cards. It eliminates the need to design and develop dedicated test apparatus for each relay type, reducing development and maintenance costs, avoiding redundant resource investment, and improving test apparatus utilization. The universal test apparatus enables standardized testing procedures, reducing testing complexity caused by differences in rack 300 design. Technicians can quickly perform testing operations in a familiar universal rack 300 environment, switching between different types of relay tests through simple configuration adjustments, reducing time delays caused by replacing dedicated test apparatus, and greatly improving testing efficiency.

[0024] In one embodiment, a front-end processor is also provided inside the cabinet 300. The front-end processor is communicatively connected to the AC current output unit, the AC voltage output unit, the DC adjustable voltage output unit, and the switching power supply unit, respectively, and is used to receive externally input test cases and control the start and stop of the AC current output unit, the AC voltage output unit, the DC adjustable voltage output unit, and the switching power supply unit according to the test cases.

[0025] Specifically, the devices within the testing setup are connected to the front-end processor via network cables, enabling communication with external systems. The front-end processor's main functions include receiving external commands, parsing test cases, issuing test commands, and uploading test data. The front-end processor receives test cases from the relay cards, parses them to obtain test commands such as start and stop commands. It then sends start commands to the AC current output unit, AC voltage output unit, DC adjustable voltage output unit, and switching power supply unit, controlling their startup. Similarly, it sends stop commands to these units, controlling their shutdown.

[0026] The cabinet 300 also contains a switch. The front-end server sends commands to the excitation signal output module 210, the excitation signal acquisition module 220, and the response signal acquisition module 240 via the switch. The excitation signal acquisition module 220 and the response signal acquisition module 240 upload the acquired data to the front-end server via the switch.

[0027] Specifically, the front-end processor, excitation signal output module 210, excitation signal acquisition module 220, and response signal acquisition module 240 form an Ethernet network through a switch for information transmission. After the excitation signal acquisition module 220 and response signal acquisition module 240 acquire the excitation signal or response signal, they upload it to the front-end processor through the switch.

[0028] In one embodiment, the excitation signal acquisition module 220 includes an analog input board, which is used to acquire the AC current signal output by the AC current output unit.

[0029] The A-phase output terminal of the AC current output unit is connected to the card adapter 230 through the first channel of the analog input board. The B-phase output terminal of the AC current output unit is also connected to the card adapter 230 through the first channel of the analog input board. The neutral line output terminal of the AC current output unit is also connected to the card adapter 230. The response signal acquisition module 240 includes a distributed measurement and control board, which is connected to the card adapter 230 and is used to acquire the response signal of the relay card in response to the AC current signal.

[0030] Specifically, the AC current signal is a three-phase AC current, and the AC current output unit uses a relay protection tester. In other embodiments, other types of three-phase AC power supply equipment can also be selected. (Reference) Figure 2The front-end processor sends test commands to the relay protection tester. The relay protection tester outputs the required three-phase AC current, which is transmitted to the card adapter 230 via the analog input board and then connected to the input pins 1# and 2#, 3# and 4#, and 5# and 6# of the relay card, respectively. The A-phase, B-phase, and C-phase current signals in the three-phase AC current output by the relay protection tester are acquired by the IO1, IO2, and IO3 channels inside the analog input board. After the relay card injects the three-phase AC current signal, the response signal of its output pin is acquired by the distributed measurement and control board, which is configured on the card adapter 230 to avoid signal distortion over long distances and achieve local acquisition of the response signal. The signal acquired by the analog input board is transmitted to the main control board, which then uploads it to the front-end processor via a switch. The response signal acquired by the distributed measurement and control board is transmitted to the switch, which then uploads it to the front-end processor.

[0031] In this embodiment, the excitation signal acquisition module 220 also includes a temperature and humidity measurement and control board.

[0032] The temperature and humidity control board is used to acquire the AC voltage signal output by the AC voltage output unit. The first output terminal of the AC voltage output unit is connected to the card adapter 230 via the first channel of the temperature and humidity control board, and the second output terminal of the AC voltage output unit is also connected to the card adapter 230. The response signal acquisition module 240 includes a distributed control board connected to the card adapter 230, used to acquire the response signal of the relay card in response to the AC voltage signal.

[0033] Specifically, the AC voltage signal has an amplitude range of 5–500VAC, which can meet the requirements of multiple voltage levels such as 110V and 220V. This AC current output unit uses an adjustable AC power supply; in other embodiments, other types of AC power supply devices can also be selected. (Reference) Figure 2 The front-end processor sends a test command to the AC adjustable power supply. The AC adjustable power supply outputs the required AC voltage signal for the test, which is transmitted to the card adapter 230 via the temperature and humidity control board, and then connected to input pins 7# and 8# of the relay card. The AC voltage signal output by the AC adjustable power supply is acquired by the IO4 channel inside the temperature and humidity control board. After the relay card injects the AC voltage signal, the response signal of its output pin is acquired by the distributed control board. The AC voltage signal acquired by the temperature and humidity control board and the response signal acquired by the distributed control board are transmitted to the switch, and then uploaded to the front-end processor by the switch.

[0034] Furthermore, an AC output board is connected between the AC voltage output unit and the card adapter 230. The first output terminal of the AC voltage output unit is connected to the card adapter 230 through the first channel of the AC output board, and the second output terminal of the AC voltage output unit is connected to the card adapter 230 through the second channel of the AC output board.

[0035] The cabinet 300 is also equipped with a main control board, which is connected to the first and second channels of the AC output board. By controlling the on / off state of the first and second channels of the AC output board, the timing of the AC voltage signal is adjusted.

[0036] The main control board receives timing commands from the front-end processor and controls the on / off timing of AC output channels D1 and D2. The timing of the AC voltage signal is adjusted after passing through channels D1 and D2 to meet the corresponding test requirements.

[0037] Furthermore, the temperature and humidity control board is also used to acquire the DC adjustable voltage signal output by the DC adjustable voltage output unit. The positive output terminal of the DC adjustable voltage output unit is connected to the card adapter 230 through the second channel of the temperature and humidity control board, and the negative output terminal of the DC adjustable voltage output unit is also connected to the card adapter 230. The response signal acquisition module 240 includes a distributed control board, which is connected to the card adapter 230, and is used to acquire the response signal of the relay card in response to the DC adjustable voltage signal.

[0038] Specifically, the adjustable DC voltage signal has a voltage amplitude range of 24–250VDC, meeting the requirements of multiple voltage levels such as 24V, 30V, and 110V. This AC current output unit uses a DC adjustable power supply; in other embodiments, other types of DC power supply devices can also be selected. (Reference) Figure 2 The front-end processor sends a test command to the DC adjustable power supply. The DC adjustable power supply outputs the required DC adjustable voltage signal for the test, which is transmitted to the card adapter 230 via the temperature and humidity control board, and then connected to input pins 9# and 10# of the relay card, respectively. The AC voltage signal output by the DC adjustable power supply is acquired by the IO5 channel inside the temperature and humidity control board. After the relay card receives the DC voltage signal, the response signal of its output pin is acquired by the distributed control board. The DC adjustable voltage signal acquired by the temperature and humidity control board and the response signal acquired by the distributed control board are transmitted to the switch, and then uploaded to the front-end processor by the switch.

[0039] Furthermore, a digital output board is connected between the DC adjustable voltage output unit and the card adapter 230. The positive output terminal of the DC adjustable voltage output unit is connected to the card adapter 230 through the first channel of the digital output board, and the negative output terminal of the DC adjustable voltage output unit is connected to the card adapter 230 through the second channel of the digital output board. A main control board is also provided inside the cabinet 300. The main control board is connected to the first and second channels of the digital output board, and adjusts the timing of the DC adjustable voltage signal by controlling the on / off state of the first and second channels of the digital output board.

[0040] The main control board receives timing commands from the front-end processor and controls the on / off timing of channels C1 and C2 on the switch output board. The timing of the DC voltage signal is adjusted after passing through channels C1 and C2 to meet the corresponding test requirements.

[0041] Furthermore, the temperature and humidity monitoring and control board is also used to acquire the switching power supply signal output by the switching power supply unit. The response signal acquisition module 240 includes a switch input board, which is used to acquire the response signal of the relay card in response to the switching power supply signal. The positive output terminal of the switching power supply unit is connected to the card adapter 230 through the third channel of the temperature and humidity monitoring and control board. Each of the four channels of the switch input board is equipped with an optocoupler. The cathodes of the diodes in the four optocouplers form a common cathode, which is connected to the negative output terminal of the switching power supply unit. The anodes of the four diodes are respectively connected to the card adapter 230.

[0042] Specifically, the voltage of the switching power supply signal is 24V. This AC current output unit uses a switching power supply. (Reference) Figure 2 The front-end processor sends a test command to the switching power supply, which outputs the required switching power supply signal. This signal is transmitted via the temperature and humidity control board to the card adapter 230, and then connected to input pins 11# and 12#, 13# and 14#, 15# and 16#, and 17# and 18# of the relay card. One end of input pins 11# / 12#, 13# / 14#, 15# / 16#, and 17# / 18# is connected to the positive terminal of the switching power supply, and the other end is connected to channels KI1, KI2, KI3, and KI4 of the digital input board, respectively. The digital input board consists of an optocoupler array with common cathode diodes. If the main board or relay of the relay card malfunctions, an optocoupler output is generated, thereby acquiring the response signal from the relay card. This response signal is a digital signal. The response signal acquired by the digital input board is transmitted to the main control board, which then transmits it to the switch, and finally to the front-end processor. The switching power supply signal output by the switching power supply is acquired by the IO6 channel inside the temperature and humidity monitoring and control board.

[0043] Furthermore, the aforementioned analog input board, AC output board, digital output board, digital input board, and main control board can be set up separately or as an integrated unit, for example, by using an acquisition and control device that integrates these boards.

[0044] In one embodiment, a case library is pre-constructed using simulation results of relay cards. This case library provides a basis for testing and fault diagnosis of the relay cards. The case library employs a three-dimensional comprehensive management approach, determining unique cases based on relay card type, experimental conditions, and input parameters. During fault diagnosis, the waveforms output from the faulty card pins and the waveforms of sensitive components are matched and compared across three dimensions: fault waveforms, waveforms of similar cards, and waveforms of the same card at different times. The front-end processor uploads the excitation and response signals to an external server or human-machine interface terminal for signal analysis. The response signal is compared with standard signals in the pre-case library. If the similarity is greater than 90%, the relay card is considered basically normal; if the similarity between the response signal and the standard signal is greater than or equal to 70% and less than 90%, the card is judged to have a minor fault; if the similarity between the response signal and the standard signal is less than 70%, the card is judged to have a serious fault.

[0045] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A universal testing device for nuclear power plant relay cards, characterized in that, include: The cabinet, and the excitation signal output module, excitation signal acquisition module, card adapter and response signal acquisition module installed in the cabinet; The excitation signal acquisition module is connected between the excitation signal output module and the card adapter, and the response signal acquisition module is connected to the card adapter; The card adapter is used to adapt to different types of relay cards and transmit the excitation signal output by the excitation signal output module to the relay card; The excitation signal acquisition module is used to acquire the excitation signal, and the response signal acquisition module is used to acquire the response signal of the relay card in response to the excitation signal; The excitation signal output module includes an AC current output unit, an AC voltage output unit, a DC adjustable voltage output unit, and a switching power supply unit. The excitation signal includes at least one of an AC current signal, an AC voltage signal, a DC adjustable voltage signal, and a switching power supply signal.

2. The universal testing device for nuclear power plant relay cards according to claim 1, characterized in that, The excitation signal acquisition module includes an analog input board, which is used to acquire the AC current signal output by the AC current output unit. The A-phase output terminal of the AC current output unit is connected to the card adapter through the first channel of the analog input board, the B-phase output terminal of the AC current output unit is connected to the card adapter through the first channel of the analog input board, and the neutral line output terminal of the AC current output unit is connected to the card adapter. The response signal acquisition module includes a distributed measurement and control board, which is connected to the card adapter and is used to acquire the response signal of the relay card in response to the AC current signal.

3. The universal testing device for nuclear power plant relay cards according to claim 1, characterized in that, The excitation signal acquisition module includes a temperature and humidity measurement and control board, which is used to acquire the AC voltage signal output by the AC voltage output unit. The first output terminal of the AC voltage output unit is connected to the card adapter through the first channel of the temperature and humidity control board, and the second output terminal of the AC voltage output unit is connected to the card adapter. The response signal acquisition module includes a distributed measurement and control board, which is connected to the card adapter and is used to acquire the response signal of the relay card in response to the AC voltage signal.

4. The universal testing device for nuclear power plant relay cards according to claim 1, characterized in that, The excitation signal acquisition module includes a temperature and humidity measurement and control board, which is used to acquire the DC adjustable voltage signal output by the DC adjustable voltage output unit. The positive output terminal of the DC adjustable voltage output unit is connected to the card adapter through the second channel of the temperature and humidity control board, and the negative output terminal of the DC adjustable voltage output unit is connected to the card adapter. The response signal acquisition module includes a distributed measurement and control board, which is connected to the card adapter and is used to acquire the response signal of the relay card in response to the DC adjustable voltage signal.

5. The universal testing device for nuclear power plant relay cards according to claim 1, characterized in that, The excitation signal acquisition module includes a temperature and humidity measurement and control board, which is used to acquire the switching power supply signal output by the switching power supply unit; the response signal acquisition module includes a switch input board, which is used to acquire the response signal of the relay card in response to the switching power supply signal. The positive output terminal of the switching power supply unit is connected to the card adapter through the third channel of the temperature and humidity monitoring board. Each of the four channels of the switch input board is equipped with an optocoupler. The cathodes of the diodes in the four optocouplers form a common cathode, which is connected to the negative output terminal of the switching power supply unit. The anodes of the four diodes are respectively connected to the card adapter.

6. The universal testing device for nuclear power plant relay cards according to claim 1, characterized in that, The cabinet is also equipped with a front-end server. The preamplifier is communicatively connected to the AC current output unit, the AC voltage output unit, the DC adjustable voltage output unit, and the switching power supply unit, respectively, and is used to receive externally input test cases and control the start and stop of the AC current output unit, the AC voltage output unit, the DC adjustable voltage output unit, and the switching power supply unit according to the test cases.

7. The universal testing device for nuclear power plant relay cards according to claim 6, characterized in that, The cabinet is also equipped with a switch; the front-end server sends instructions to the excitation signal output module, the excitation signal acquisition module and the response signal acquisition module based on the switch, and the excitation signal acquisition module and the response signal acquisition module upload the acquired data to the front-end server based on the switch.

8. The universal testing device for nuclear power plant relay cards according to claim 3, characterized in that, An AC output board is also connected between the AC voltage output unit and the card adapter; the first output terminal of the AC voltage output unit is connected to the card adapter through the first channel of the AC output board, and the second output terminal of the AC voltage output unit is connected to the card adapter through the second channel of the AC output board. The cabinet is also equipped with a main control board, which is connected to the first channel and the second channel of the AC output board. By controlling the on / off state of the first channel and the second channel of the AC output board, the timing of the AC voltage signal is adjusted.

9. The universal testing device for nuclear power plant relay cards according to claim 4, characterized in that, A switch output board is also connected between the DC adjustable voltage output unit and the card adapter; the positive output terminal of the DC adjustable voltage output unit is connected to the card adapter through the first channel of the switch output board, and the negative output terminal of the DC adjustable voltage output unit is connected to the card adapter through the second channel of the switch output board. The cabinet is also equipped with a main control board, which is connected to the first channel and the second channel of the switch output board. By controlling the on / off state of the first channel and the second channel of the switch output board, the timing of the DC adjustable voltage signal is adjusted.

10. The universal testing device for nuclear power plant relay cards according to claim 1, characterized in that, The AC current signal is a three-phase AC current, the AC voltage signal has a voltage range of 5~500VAC, the DC adjustable voltage signal has a voltage range of 24~250VDC, and the switching power supply signal has a voltage of 24V.

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