A modular intelligent test device for low-voltage cabinets in nuclear power plants

Abstract

The present invention discloses a modular intelligent testing device for a low-voltage cabinet in a nuclear power plant. A microcomputer module, an interface control module, a switch mechanical characteristic tester, an insulation resistance test module and a comprehensive protection verification module in the device are independent of each other in physical structure. The modules are quickly assembled through interfaces arranged on the modules to realize their combined functions. The modules can also be used separately to realize their corresponding functions. Compared with an integrated testing device, the present invention has a small size, light weight, convenient transportation, and flexible combination, and effectively solves the problem of testing the low-voltage cabinet in a nuclear power plant in certain narrow environments. Moreover, the testing process of the present invention does not require complicated wiring and wiring removal, and is safe and reliable. Different low-voltage cabinet test items of the low-voltage cabinet in a nuclear power plant can be directly switched through the microcomputer module. The testing process is simple and the testing efficiency is high. Test-related data is uploaded to the cloud for management, and the degree of intelligence is high.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage cabinet detection in nuclear power plants, and in particular to a modular intelligent testing device for low-voltage cabinets in nuclear power plants. Background Art

[0002] Nuclear power is a low-carbon, environmentally friendly, clean energy. Nuclear power does not produce air pollutants such as sulfur dioxide, nitrogen oxides, and smoke during the power generation process. The emission of carbon dioxide is much lower than that of thermal power, and has become one of the important energy sources used by people. The low-voltage cabinet of a nuclear power plant directly supplies power to important equipment in the nuclear power plant. Its stable operation directly guarantees the safe operation of key equipment in the nuclear power plant, thereby ensuring nuclear safety. However, the existing testing methods for low-voltage cabinets in nuclear power plants still have the following shortcomings: First, due to the different control principles of switchboards of different companies and models, there are many types of relay protection devices, and there is no unified standard for the control line interface of brands such as primary circuit low-voltage circuit breakers, resulting in non-standard products at home and abroad. At present, the on-site testing of low-voltage cabinets in nuclear power plants is carried out in the cabinet warehouse. At the same time, the switch auxiliary nodes are measured to determine whether the switch opening and closing actions and related protection functions are normal. This testing method involves a large number of wire removals, and there are risks of DC circuit short circuit, grounding, and wrong wiring. It is necessary to measure the terminal position of the cabinet cable warehouse many times, which is complicated and risky. Moreover, many instruments are needed in the test process, and each function test must be tested step by step through these instruments. The wiring of the test process is cumbersome, the test efficiency is low, and the degree of intelligence is low. Second, although some test devices can realize centralized testing of multiple low-voltage cabinet test items, these test devices are relatively large and inconvenient to transport. Moreover, when it is necessary to test in some small spaces in nuclear power plants, sometimes the test device cannot enter, which restricts the application environment of the test device to a certain extent.

[0003] The above problems need to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to solve the problems mentioned in the above background technology part through a modular intelligent testing device for low-voltage cabinets in nuclear power plants.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The embodiment of the present invention provides a modular intelligent testing device for a low-voltage cabinet in a nuclear power plant, the device comprising a microcomputer module, an interface control module, a switch mechanical characteristic tester, an insulation resistance test module and a comprehensive protection verification module; wherein the microcomputer module, the interface control module, the switch mechanical characteristic tester, the insulation resistance test module and the comprehensive protection verification module are independent of each other in physical structure, the interface control module is provided with an interface for connecting the microcomputer module, the switch mechanical characteristic tester, the insulation resistance test module, the comprehensive protection verification module and the low-voltage circuit to be tested; the switch mechanical characteristic tester, the insulation resistance test module and the comprehensive protection verification module are correspondingly provided with interfaces for connecting the microcomputer module and the interface control module; when working, the microcomputer module is connected to the switch mechanical characteristic tester, the insulation resistance test module and the comprehensive protection verification module. The microcomputer module, interface control module, switch mechanical characteristic tester, insulation resistance test module and comprehensive protection verification module are respectively transported to the location of the low-voltage cabinet of the nuclear power plant to be tested, and the microcomputer module, interface control module, switch mechanical characteristic tester, insulation resistance test module and comprehensive protection verification module are connected using a wiring harness of corresponding specifications. The low-voltage cabinet test item is selected through the microcomputer module, and the microcomputer module outputs the corresponding instruction to the interface control module. The interface control module switches the switch mechanical characteristic tester, insulation resistance test module or comprehensive protection verification module corresponding to the selected low-voltage cabinet test item according to the received instruction, and the switch mechanical characteristic tester, insulation resistance test module or comprehensive protection verification module transmits and stores the test data to the microcomputer module.

[0007] In particular, after the microcomputer module, interface control module, switch mechanical characteristics tester, insulation resistance test module and comprehensive protection verification module are respectively transported to the location of the low-voltage cabinet of the nuclear power plant to be tested, the insulation resistance test module is placed on the comprehensive protection verification module, the switch mechanical characteristics tester is placed on the insulation resistance test module, the interface control module is placed on the switch mechanical characteristics tester, and the microcomputer module is placed on the interface control module.

[0008] In particular, the microcomputer module, interface control module, switch mechanical characteristic tester, insulation resistance test module and comprehensive protection verification module are all provided with the same 484 communication port to realize 484 communication.

[0009] Particularly, the interface control module adopts but is not limited to a programmable logic controller (PLC) module.

[0010] In particular, the corresponding low-voltage cabinet test items are selected through the display screen on the microcomputer module, and an independent comprehensive test report is generated for each low-voltage interval. The completed test contents include but are not limited to: 1. Power circuit contact resistance test; 2. Power circuit phase-to-phase and ground insulation resistance test; 3. Switch control circuit auxiliary contact opening and closing state detection and conduction direct resistance measurement; 4. Switch control circuit simulation external short circuit; 5. Main circuit opening and closing synchronization test; 6. Voltage setting value and delay time verification; 7. Three-phase overcurrent, zero-sequence overcurrent setting value and delay time verification; 8. Delay relay delay time verification; 9. Overload protection curve verification; 10. Relay coil excitation and shunt excitation voltage verification; wherein, the microcomputer module is also used to analyze relevant detection data, as well as the storage and import and export of detection data.

[0011] In particular, the switch mechanical characteristics tester is used to realize but not limited to testing the closing time, closing bounce, and three-phase synchronization, and integrates voltage source and current source, and loop resistance testing; the insulation resistance test module is used to realize the insulation characteristics test of the main circuit and secondary circuit of the low-voltage switch.

[0012] In particular, the comprehensive protection verification module is used to implement but is not limited to high and low voltage setting and delay time verification; three-phase overcurrent, zero-sequence overcurrent setting and delay time verification; delay relay delay time verification; overload protection curve verification; relay coil excitation and shunt voltage verification.

[0013] In particular, the modular intelligent testing device for low-voltage cabinets in nuclear power plants is also communicatively connected to an intelligent testing cloud platform for low-voltage cabinets in nuclear power plants, and the microcomputer module sends test-related data to the cloud for management.

[0014] In particular, the intelligent cloud platform for testing low-voltage cabinets in nuclear power plants includes a project management module, a maintenance personnel management module, an early warning module and a report module; wherein the project management module is used to automatically generate the content of maintenance and low-voltage cabinet testing according to the relevant procedures of daily maintenance management, and push it to the relevant departments or maintenance testers in the form of a table; after the maintenance testers complete the relevant content, they confirm the test results through a mobile phone or PC; the maintenance personnel management module is used for personnel authority division, approval process, and task confirmation; the early warning module is used to establish a mathematical model based on but not limited to the historical data, factory date, and service life related data of the low-voltage switch of the low-voltage cabinet, and to issue early warnings for key electrical switches; the report module is used to form a report on the test results of the low-voltage cabinet and choose whether to send it to the cloud, and the report will give a judgment on whether the test results are qualified.

[0015] Compared with the prior art, the modular intelligent test device for low-voltage cabinets in nuclear power plants proposed in the embodiment of the present invention has the following advantages: First, the microcomputer module, the interface control module, the switch mechanical characteristics tester, the insulation resistance test module and the comprehensive protection verification module are independent of each other in physical structure, and can be quickly assembled through the interfaces set on each module to realize its combined function, or each module can be used separately to realize its corresponding function. Compared with the integrated test device, the present invention is small in size, light in weight, easy to carry, and flexible in combination, which effectively solves the problem of testing low-voltage cabinets in nuclear power plants in certain narrow environments; Second, it can realize the testing of various low-voltage intervals and monitoring compartments, and the testing process does not require complicated wiring and disconnection, which is safe and reliable. Different low-voltage cabinet test items of nuclear power plants can be directly switched through the microcomputer module, and the testing process is simple and the testing efficiency is high; Third, the relevant data of the test device is uploaded to the cloud to establish an intelligent test cloud platform for low-voltage cabinets in nuclear power plants. The intelligent test cloud platform for low-voltage cabinets in nuclear power plants has project management functions, maintenance personnel management functions, early warning functions, and reporting functions, and has a high degree of intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the principle of a modular intelligent testing device for a low-voltage cabinet in a nuclear power plant provided by an embodiment of the present invention;

[0017] Figure 2 A front view of a modular intelligent testing device for a low-voltage cabinet in a nuclear power plant provided by an embodiment of the present invention;

[0018] Figure 3 A side view of a modular intelligent testing device for a low-voltage cabinet in a nuclear power plant provided by an embodiment of the present invention;

[0019] Figure 4 A schematic diagram of the three-dimensional structure of a modular intelligent testing device for a low-voltage cabinet in a nuclear power plant provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood. It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a centering element at the same time. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] Please refer to Figure 1As shown, the modular intelligent testing device for the low-voltage cabinet of a nuclear power plant in this embodiment includes a microcomputer module 101, an interface control module 102, a switch mechanical characteristic tester 103, an insulation resistance test module 104 and a comprehensive protection verification module 105; wherein the microcomputer module 101, the interface control module 102, the switch mechanical characteristic tester 103, the insulation resistance test module 104 and the comprehensive protection verification module 105 are independent of each other in physical structure, and the interface control module 102 is provided with an interface for connecting the microcomputer module 101, the switch mechanical characteristic tester 103, the insulation resistance test module 104, the comprehensive protection verification module 105 and the low-voltage circuit to be tested; the switch mechanical characteristic tester 103, the insulation resistance test module 104 and the comprehensive protection verification module 105 are correspondingly provided with interfaces for connecting the microcomputer module 101 and the interface control module 102, and the interface control module 102 and the insulation resistance test module 104 are also provided with aviation plugs 1021 and aviation plugs 1041 for connecting the circuit or component to be tested. During operation, the microcomputer module 101, the interface control module 102, the switch mechanical characteristic tester 103, the insulation resistance test module 104 and the comprehensive security verification module 105 are respectively moved to the location of the low-voltage cabinet to be tested in the nuclear power plant, and the microcomputer module 101, the interface control module 102, the switch mechanical characteristic tester 103, the insulation resistance test module 104 and the comprehensive security verification module 105 are connected using a wiring harness of corresponding specifications. The low-voltage cabinet test item is selected through the microcomputer module 101, and the microcomputer module 101 outputs the corresponding instruction to the interface control module 102. The interface control module 102 switches the switch mechanical characteristic tester 103, the insulation resistance test module 104 or the comprehensive security verification module 105 corresponding to the selected low-voltage cabinet test item according to the received instruction, and the switch mechanical characteristic tester 103, the insulation resistance test module 104 or the comprehensive security verification module 105 transmits and stores the test data to the microcomputer module 101.

[0022] Specifically, in this embodiment, Figures 2 to 4 As shown, after the microcomputer module 101, the interface control module 102, the switch mechanical characteristics tester 103, the insulation resistance test module 104 and the comprehensive security verification module 105 are respectively moved to the location of the low-voltage cabinet of the nuclear power plant to be tested, the insulation resistance test module 104 is placed on the comprehensive security verification module 105, the switch mechanical characteristics tester 103 is placed on the insulation resistance test module 104, the interface control module 102 is placed on the switch mechanical characteristics tester 103, and the microcomputer module 101 is placed on the interface control module 102. It should be noted that in the application, the arrangement order of the microcomputer module 101, the interface control module 102, the switch mechanical characteristics tester 103, the insulation resistance test module 104 and the comprehensive security verification module 105 is not limited to Figures 2 to 4The method shown can be flexibly adjusted according to needs.

[0023] Specifically, in this embodiment, the microcomputer module 101, the interface control module 102, the switch mechanical characteristics tester 103, the insulation resistance test module 104 and the comprehensive protection verification module 105 are all provided with the same 484 communication port to realize 484 communication. In this embodiment, the switch mechanical characteristics tester 103 is used to realize but not limited to the testing of closing time, closing bounce, and three-phase synchronization, and integrates voltage source and current source, and loop resistance testing. The insulation resistance test module 104 is used to realize the insulation characteristics test of the main circuit and secondary circuit of the low-voltage switch. The comprehensive protection verification module 105 is used to realize but not limited to the high and low voltage setting and delay time verification; three-phase overcurrent, zero-sequence overcurrent setting and delay time verification; delay relay delay time verification; overload protection curve verification; relay coil excitation and shunt excitation voltage verification.

[0024] Specifically, in this embodiment, the interface control module 102 adopts but is not limited to a programmable logic controller (PLC) module. Through the communication of the microcomputer module 101, the programmable logic controller module, the switch mechanical characteristic tester 103, the insulation resistance test module 104 and the comprehensive protection verification module 105, and using test software with different functions, the programmable logic controller module can realize automatic switching of the test loop.

[0025] Specifically, in this embodiment, the interface displayed on the microcomputer module 101 includes but is not limited to the relay protection test function and interface, the insulation characteristic test function and interface, and the switch characteristic test function and interface. The user can select the corresponding test function to implement the test of the corresponding function of the low-voltage cabinet of the nuclear power plant. The corresponding low-voltage cabinet test items are selected through the display screen on the microcomputer module 101, and each low-voltage interval generates an independent comprehensive test report. The completed test content includes but is not limited to: 1. Power circuit contact resistance test; 2. Power circuit phase-to-phase and ground insulation resistance test; 3. Switch control circuit auxiliary contact opening and closing state detection and conduction direct resistance measurement; 4. Switch control circuit simulates external short circuit; 5. Main circuit opening and closing synchronization test; 6. Voltage setting value and delay time verification; 7. Three-phase overcurrent, zero-sequence overcurrent setting value and delay time verification; 8. Delay relay delay time verification; 9. Overload protection curve verification; 10. Relay coil excitation and shunt excitation voltage verification; Among them, the microcomputer module 101 is also used to analyze relevant detection data, as well as the storage and import and export of detection data. Among them, the interface displayed on the display screen of the microcomputer module 101 includes but is not limited to the relay protection test function and interface, the insulation characteristic test function and interface, and the switch characteristic test function and interface. The user can select the corresponding test function to realize the test of the corresponding function of the low-voltage cabinet of the nuclear power plant.

[0026] Specifically, in this embodiment, the microcomputer module 101 in the modular intelligent test device for the low-voltage cabinet of a nuclear power plant is also connected to the intelligent test cloud platform for the low-voltage cabinet of the nuclear power plant, and the microcomputer module 101 sends the test-related data to the cloud for management. In this embodiment, the intelligent test cloud platform for the low-voltage cabinet of the nuclear power plant includes a project management module, a maintenance personnel management module, an early warning module, and a report module; wherein the project management module is used to automatically generate the content of maintenance and low-voltage cabinet testing according to the relevant regulations of daily maintenance management, and push it to the relevant departments or maintenance test personnel in the form of a table; after the maintenance test personnel complete the relevant content, they confirm the test results through a mobile phone or PC; the maintenance personnel management module is used for personnel authority division, approval process, and task confirmation; the early warning module is used to establish a mathematical model based on, but not limited to, the historical data, factory date, and service life related data of the low-voltage switch of the low-voltage cabinet, and to warn the key electrical switches; the report module is used to form a report on the test results of the low-voltage cabinet and choose whether to send it to the cloud, and the report will give a judgment on whether the test results are qualified.

[0027] The technical solution of the present invention has the following advantages: First, the microcomputer module, interface control module, switch mechanical characteristics tester, insulation resistance test module and comprehensive protection verification module are independent of each other in physical structure, and can be quickly assembled through the interfaces set on each module to realize its combined function, or each module can be used separately to realize its corresponding function. Compared with the integrated test device, the present invention is small in size, light in weight, easy to carry, and flexible in combination, which effectively solves the problem of testing low-voltage cabinets in nuclear power plants under certain narrow environments; Second, it can realize the testing of various low-voltage intervals and monitoring compartments, and the testing process does not require complicated wiring and disconnection, which is safe and reliable. Different low-voltage cabinet test items of nuclear power plants can be directly switched through the microcomputer module, and the testing process is simple and the testing efficiency is high; Third, the relevant data of the test device is uploaded to the cloud to establish an intelligent test cloud platform for low-voltage cabinets in nuclear power plants. The intelligent test cloud platform for low-voltage cabinets in nuclear power plants has project management functions, maintenance personnel management functions, early warning functions, and reporting functions, and has a high degree of intelligence.

[0028] Those skilled in the art can understand that all or part of the above embodiments can be implemented by instructing related hardware through a microcomputer module program, and the program can be stored in a storage medium readable by a microcomputer module. When the program is executed, it can include the process of the above-mentioned embodiments of each method. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0029] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A modular intelligent testing device for low-voltage cabinets in nuclear power plants, characterized in that: The device comprises a microcomputer module, an interface control module, a switch mechanical characteristic tester, an insulation resistance test module and a comprehensive protection verification module; wherein the microcomputer module, the interface control module, the switch mechanical characteristic tester, the insulation resistance test module and the comprehensive protection verification module are independent of each other in physical structure, and the interface control module is provided with an interface for connecting the microcomputer module, the switch mechanical characteristic tester, the insulation resistance test module, the comprehensive protection verification module and the low-voltage circuit to be tested; the switch mechanical characteristic tester, the insulation resistance test module and the comprehensive protection verification module are correspondingly provided with interfaces for connecting the microcomputer module and the interface control module; when working, the microcomputer module, the interface control module, the switch mechanical characteristic tester, the insulation resistance test module and the comprehensive protection verification module are connected to the microcomputer module and the interface control module. The characteristic tester, insulation resistance test module and comprehensive protection verification module are respectively carried to the location of the low-voltage cabinet of the nuclear power plant to be tested, and the microcomputer module, the interface control module, the switch mechanical characteristic tester, the insulation resistance test module and the comprehensive protection verification module are connected by using a wiring harness of corresponding specifications, and the low-voltage cabinet test item is selected through the microcomputer module, and the microcomputer module outputs a corresponding instruction to the interface control module. The interface control module switches the switch mechanical characteristic tester, the insulation resistance test module or the comprehensive protection verification module corresponding to the selected low-voltage cabinet test item according to the received instruction, and the switch mechanical characteristic tester, the insulation resistance test module or the comprehensive protection verification module transmits and stores the test data to the microcomputer module; The comprehensive protection verification module is used to implement the following: high and low voltage setting and delay time verification; three-phase overcurrent, zero-sequence overcurrent setting and delay time verification; delay relay delay time verification; overload protection curve verification; relay coil excitation and shunt excitation voltage verification.

2. The modular intelligent testing device for low-voltage cabinets in nuclear power plants according to claim 1, characterized in that: After the microcomputer module, interface control module, switch mechanical characteristics tester, insulation resistance test module and comprehensive protection verification module are respectively moved to the location of the low-voltage cabinet of the nuclear power plant to be tested, the insulation resistance test module is placed on the comprehensive protection verification module, the switch mechanical characteristics tester is placed on the insulation resistance test module, the interface control module is placed on the switch mechanical characteristics tester, and the microcomputer module is placed on the interface control module.

3. The modular intelligent testing device for low-voltage cabinets in nuclear power plants according to claim 1, characterized in that: The microcomputer module, interface control module, switch mechanical characteristic tester, insulation resistance test module and comprehensive protection verification module are all provided with the same 484 communication port to realize 484 communication.

4. The modular intelligent testing device for low-voltage cabinets in nuclear power plants according to claim 1, characterized in that: The interface control module includes a programmable logic controller module.

5. The modular intelligent testing device for low-voltage cabinets in nuclear power plants according to any one of claims 1 to 4, characterized in that: The corresponding low-voltage cabinet test items are selected through the display screen on the microcomputer module, and an independent comprehensive test report is generated for each low-voltage interval. The completed test contents include:

1. Power circuit contact resistance test; 2. Power circuit phase-to-phase and ground insulation resistance test; 3. Switch control circuit auxiliary contact opening and closing state detection and conduction direct resistance measurement; 4. Switch control circuit simulation external short circuit; 5. Main circuit opening and closing synchronization test; 6. Voltage setting value and delay time verification; 7. Three-phase overcurrent, zero-sequence overcurrent setting value and delay time verification; 8. Delay relay delay time verification; 9. Overload protection curve verification; 10. Relay coil excitation and shunt excitation voltage verification; Among them, the microcomputer module is also used to analyze relevant detection data, as well as the storage and import and export of detection data.

6. The modular intelligent testing device for low-voltage cabinets in nuclear power plants according to claim 1, characterized in that: The switch mechanical characteristics tester is used to implement the following: testing the closing time, closing bounce, and three-phase synchronization, while integrating voltage source, current source, and loop resistance testing; the insulation resistance test module is used to implement insulation characteristics testing of the main circuit and secondary circuit of the low-voltage switch.

7. The modular intelligent testing device for low-voltage cabinets in nuclear power plants according to claim 1, characterized in that: The device is also connected to the intelligent test cloud platform of the nuclear power plant low-voltage cabinet, and the microcomputer module sends the test-related data to the cloud for management.

8. The modular intelligent testing device for low-voltage cabinets in nuclear power plants according to claim 7, characterized in that: The intelligent cloud platform for testing low-voltage cabinets in nuclear power plants includes a project management module, a maintenance personnel management module, an early warning module and a report module; wherein the project management module is used to automatically generate the content of maintenance and low-voltage cabinet testing according to the relevant procedures of daily maintenance management, and push it to the relevant departments or maintenance testers in the form of a table; after the maintenance testers complete the relevant content, they confirm the test results through a mobile phone or PC; the maintenance personnel management module is used for personnel authority division, approval process, and task confirmation; the early warning module is used to establish a mathematical model based on historical data including low-voltage switch measurements of low-voltage cabinets, factory date, and service life related data, and to issue early warnings for key electrical switches; the report module is used to form a report on the test results of the low-voltage cabinet and choose whether to send it to the cloud. The report will give a judgment on whether the test results are qualified.

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