Automatic detection method and system for low-voltage electric appliance cabinet

Abstract

The invention provides an automatic detection method and system for a low-voltage electrical appliance cabinet, and relates to the technical field of electrical variable detection, and the method comprises the steps: carrying out the electrical connection through a test cable; based on a preset test sequence, dynamic detection is carried out through a plurality of independent detection modules, and a wiring detection result and a dynamic detection value sequence are obtained; generating first reminding information according to the line abnormal state; performing data processing to generate dynamic detection features; calling a dynamic detection alarm threshold value; performing anomaly recognition on the dynamic detection features based on the dynamic detection alarm threshold, and generating second reminding information according to an anomaly recognition result; and performing abnormity reminding according to the first reminding information and the second reminding information. The technical problems that in the prior art, only on-off of a circuit can be detected through manual detection, the function correctness of a logic element cannot be detected, informatization lags behind, personnel experience is excessively relied on, automatic testing is lacked, and the quality, efficiency and accuracy of a detection result are poor are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric variable detection, and in particular to an automatic detection method and system for a low-voltage electrical cabinet. Background Art

[0002] The AC locomotive low-voltage electrical cabinet is an important part of the locomotive control system. Its functions involve power distribution and control of auxiliary circuits and control circuits. There are many lines and the logic is complex. The wiring logic detection of the electrical cabinet is a heavy task. Its correct and reliable logic connection circuit is crucial to the safety of locomotive operation.

[0003] Before installing the electrical cabinet, its wiring logic, insulation condition, withstand voltage performance and contact resistance need to be tested to reduce rework caused by debugging after installation. At present, manual testing can only detect the continuity of the circuit, but cannot detect the correctness of the logic component function. Errors can only be found when the system is running.

[0004] At present, there are problems in the inspection of locomotive electrical cabinets, such as lagging in informatization, over-reliance on personnel experience, lack of automated testing equipment, and poor accumulation of test data. The quality, efficiency, and accuracy of the inspection of low-voltage electrical cabinets of AC locomotives are facing upgrade bottlenecks and huge challenges. Summary of the invention

[0005] The present application provides a method and system for automatic detection of low-voltage electrical cabinets, aiming to solve the technical problems that the manual detection in the prior art can only detect the on-off state of the circuit, but cannot detect the correctness of the functions of logical elements, and has lagging in informatization, over-reliance on personnel experience, and lack of automated testing, resulting in poor quality, efficiency, and accuracy of the detection results.

[0006] The first aspect disclosed in the present application provides a method for automatic detection of a low-voltage electrical cabinet, which is applied to an automatic detection system for a low-voltage electrical cabinet, wherein the system is communicatively connected to an automatic detection device for a low-voltage electrical cabinet of an AC locomotive, and the method comprises: communicating the electrical connection between the automatic detection device for the low-voltage electrical cabinet of an AC locomotive and a target low-voltage electrical cabinet through a test cable; activating the automatic detection device for the low-voltage electrical cabinet of an AC locomotive, and dynamically detecting the target low-voltage electrical cabinet through multiple independent detection modules based on a preset test sequence, and obtaining a wiring detection result and a dynamic detection value sequence; generating a first reminder message according to an abnormal line state in the wiring detection result; receiving the dynamic detection value sequence in real time through a data docking adapter, performing data processing, and generating a dynamic detection feature; retrieving a dynamic detection alarm threshold through a parameter configuration submodule of a system setting module, wherein the dynamic detection alarm threshold includes a contact resistance detection result alarm threshold, an insulation detection result alarm threshold, a withstand voltage detection result alarm threshold, and an energy consumption meter detection result alarm threshold; performing abnormal identification on the dynamic detection feature based on the dynamic detection alarm threshold, and generating a second reminder message according to the abnormal identification result; and performing an abnormal reminder of the target low-voltage electrical cabinet according to the first reminder message and the second reminder message.

[0007] The second aspect disclosed in the present application provides a low-voltage electrical cabinet automatic detection system, the system is communicatively connected with the automatic detection device of the low-voltage electrical cabinet of an AC locomotive, the system is used for the above-mentioned automatic detection method of a low-voltage electrical cabinet, the system comprises: an electrical connection unit, the electrical connection unit is used to communicate the electrical connection between the automatic detection device of the low-voltage electrical cabinet of the AC locomotive and the target low-voltage electrical cabinet through a test cable; a dynamic detection unit, the dynamic detection unit is used to activate the automatic detection device of the low-voltage electrical cabinet of the AC locomotive, and based on a preset test sequence, dynamically detect the target low-voltage electrical cabinet through multiple independent detection modules to obtain a wiring detection result and a dynamic detection value sequence; a first reminder information generation unit, the first reminder information generation unit is used to generate a first reminder information according to the abnormal line state in the wiring detection result; data processing Unit, the data processing unit is used to receive the dynamic detection value sequence in real time through the data docking adapter, perform data processing, and generate dynamic detection features; an alarm threshold calling unit, the alarm threshold calling unit is used to call the dynamic detection alarm threshold through the parameter configuration submodule of the system setting module, wherein the dynamic detection alarm threshold includes the contact resistance detection result alarm threshold, the insulation detection result alarm threshold, the withstand voltage detection result alarm threshold, and the energy consumption meter detection result alarm threshold; a second reminder information generation unit, the second reminder information generation unit is used to identify the abnormality of the dynamic detection feature based on the dynamic detection alarm threshold, and generate a second reminder information according to the abnormal identification result; an abnormal reminder unit, the abnormal reminder unit is used to provide abnormal reminder of the target low-voltage electrical cabinet according to the first reminder information and the second reminder information.

[0008] One or more technical solutions provided in this application have at least the following technical effects or advantages: Through the method of multi-module independent detection and preset test sequence, the wiring status and dynamic characteristics of the target low-voltage electrical cabinet are automatically detected, which reduces manual intervention, improves the degree of automation and accuracy of detection, and ensures the comprehensiveness of detection; the parameter configuration submodule of the system setting module provides a flexible alarm threshold configuration function, allowing the detection alarm threshold to be adjusted according to specific needs, and optimized configuration to improve the adaptability and flexibility of the system; the dynamic detection data is processed in real time through the data docking adapter, and automatic abnormality identification is performed based on dynamic detection characteristics and alarm thresholds, and timely first reminder information and second reminder information are generated to achieve rapid abnormality identification and reminders, thereby improving the system's response speed and fault handling capabilities; by transmitting the detection data to the LMIS system in real time and displaying the data, the efficiency of data management and display is improved.

[0009] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic diagram of a low-voltage electrical cabinet automatic detection method provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of an automatic detection system for a low-voltage electrical cabinet provided in an embodiment of the present application.

[0011] Explanation of the accompanying drawings: electrical connection unit 10, dynamic detection unit 20, first reminder information generation unit 30, data processing unit 40, alarm threshold calling unit 50, second reminder information generation unit 60, abnormality reminder unit 70. DETAILED DESCRIPTION

[0012] The embodiments of the present application provide a method and system for automatic detection of low-voltage electrical cabinets, thereby solving the technical problems that the manual detection in the prior art can only detect the on-off state of the circuit but cannot detect the correctness of the functions of logical elements, and that the quality, efficiency and accuracy of the detection results are poor due to information lag, excessive reliance on personnel experience and lack of automated testing.

[0013] After introducing the basic principles of the present application, various non-limiting implementation methods of the present application will be specifically introduced below in conjunction with the accompanying drawings of the specification. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0014] Embodiment 1, as Figure 1 As shown, an embodiment of the present application provides a method for automatic detection of a low-voltage electrical cabinet, the method is applied to a low-voltage electrical cabinet automatic detection system, the system is communicatively connected with an automatic detection device for a low-voltage electrical cabinet of an AC locomotive, and the method includes: The electrical connection between the automatic detection device for the AC locomotive low-voltage electrical cabinet and the target low-voltage electrical cabinet is communicated through a test cable.

[0015] The automatic detection device for low-voltage electrical cabinets of AC locomotives is a typical software-hardware-algorithm integrated system, which includes the application software of the automatic detection device for low-voltage electrical cabinets of AC locomotives. The detection circuit drives the detection according to the set test logic, and realizes the automatic switching and protection of multi-channel cable insulation detection to prevent the insulation test voltage from damaging the low-voltage components. It also adopts a multi-channel simultaneous detection design to shorten the detection time and improve the detection efficiency.

[0016] The device as a whole consists of three parts, namely, an industrial computer, a control cabinet, and a test cable. The industrial computer and the control cabinet are connected by a serial field bus, and the serial bus is used to complete the issuance of commands and the collection of test information. The control cabinet and the object under test are connected by a test cable to transmit test signals.

[0017] The test cable refers to the cable between the control cabinet of the connection device and the target low-voltage electrical cabinet. Its function is to communicate the electrical connection between the test device and the target low-voltage electrical cabinet. The target low-voltage electrical cabinet has a circuit with an external connector. The test cable is designed with a connector of the same model with the same wiring definition at the target low-voltage electrical cabinet end and can be directly plugged into the electrical cabinet. The target low-voltage electrical cabinet circuit is a terminal block interface. The test cable is designed as a wire sequence fixing clamp with the same sequence at the target low-voltage electrical cabinet end, and the corresponding wire number is marked on the cable. The end of each wire is crimped with a cold-pressed terminal to facilitate one-to-one connection with the terminal block.

[0018] The cabinet end of the device uses a 32-core rectangular heavy-duty connector (to adapt to 500V insulation voltage). Considering the particularity of the withstand voltage test, it is designed into two types of interfaces: non-withstand voltage test interface (including line sequence, insulation, relay action, contact resistance and energy consumption) and withstand voltage test interface. The withstand voltage test interface only needs to be connected during the withstand voltage test. For other tests, only the non-withstand voltage test interface needs to be connected. The device will automatically switch to the corresponding functional unit according to the test function.

[0019] The reason why the withstand voltage test is listed separately is that the principle of the withstand voltage test is to measure the leakage current value of all external connection wires to the housing under a certain voltage for a certain period of time. In this way, the withstand voltage does not require output switching control, and only needs to connect the corresponding external connection wires in parallel and then inject the required voltage. The physical disconnection mode helps to reduce the size, weight and power consumption of the device, and it only needs to unplug the connector on the device side.

[0020] The automatic detection device for the AC locomotive low-voltage electrical cabinet is activated, and based on a preset test sequence, a dynamic detection is performed on the target low-voltage electrical cabinet through multiple independent detection modules to obtain a wiring detection result and a dynamic detection value sequence.

[0021] Activate the automatic detection device of the AC locomotive low-voltage electrical cabinet, and determine the detection process according to the preset test sequence of the system. The sequence is line sequence detection, relay action detection, contact resistance detection, insulation detection, withstand voltage detection and energy consumption meter detection. After dynamic detection, the line sequence detection results and relay action detection results constitute the wiring detection results, and the contact resistance detection results, insulation detection results, withstand voltage detection results and energy consumption meter detection results constitute the dynamic detection numerical sequence.

[0022] A first reminder message is generated according to the abnormal line status in the wiring detection result.

[0023] Line sequence detection is to detect the connection relationship between any line and all other lines (including the ground wire), including four states: normal connection, short circuit, open circuit and mixed lines. Among them, the latter three states need to be prompted and rectified. According to the line sequence detection results, abnormal states such as short circuit, open circuit and mixed lines, as well as the line positions corresponding to the abnormal states, are extracted to generate the first reminder information, indicating that the line sequence detection is abnormal.

[0024] Relay action detection is to detect whether the relay can be completely closed and released under the specified driving voltage. By outputting the specified voltage to the relay driving end and measuring the contact resistance between the relay contacts, it can be determined whether the relay meets the requirements. Those that do not meet the requirements are marked as abnormal states. The abnormal states that do not meet the requirements are extracted based on the relay action detection results, and the first reminder information is also generated to indicate that the relay action detection is abnormal.

[0025] The dynamic detection value sequence is received in real time through a data docking adapter, data processing is performed, and dynamic detection features are generated.

[0026] For line sequence detection, relay action detection, contact resistance detection, insulation detection, withstand voltage detection and energy consumption meter detection, data docking adapters are established respectively to receive data in real time, and pre-process the data according to pre-defined rules, including cleaning, conversion and other operations. Specifically, the received raw data is cleaned to remove invalid data and noise to ensure the accuracy of the data, and the cleaned data is organized in a preset format for subsequent processing. Key feature values ​​are extracted from the processed data, for example, statistical analysis is performed on dynamic detection values, and maximum, minimum, mean, standard deviation, etc. are extracted. Trend analysis is performed on dynamic detection values ​​to identify the law of data changes and abnormal fluctuations. The extracted features are integrated to generate comprehensive dynamic detection features for evaluating the operating status of low-voltage electrical cabinets.

[0027] The dynamic detection alarm threshold is called up through the parameter configuration submodule of the system setting module, wherein the dynamic detection alarm threshold includes the contact resistance detection result alarm threshold, the insulation detection result alarm threshold, the withstand voltage detection result alarm threshold, and the energy consumption meter detection result alarm threshold.

[0028] The application software of the automatic detection device of low-voltage electrical cabinet for AC locomotive mainly includes seven modules: line sequence detection, contact resistance detection, relay action detection, insulation detection, withstand voltage detection, energy consumption meter detection and system setting. The system setting module includes three sub-modules: user management, authority management and parameter configuration. The parameter configuration sub-module mainly has the function of adjusting and setting the test voltage, alarm threshold and reserved interface of the automatic detection device of the target low-voltage electrical cabinet.

[0029] The dynamic detection alarm threshold is called up through the parameter configuration submodule, including the contact resistance detection result alarm threshold, insulation detection result alarm threshold, withstand voltage detection result alarm threshold, and energy consumption meter detection result alarm threshold. Among them, each alarm threshold is set according to the specific detection requirements and the operating conditions of the equipment to accurately reflect the abnormal status.

[0030] The dynamic detection feature is identified as abnormal based on the dynamic detection alarm threshold, and second reminder information is generated according to the abnormal identification result.

[0031] Anomalies of the dynamic detection feature are identified based on the dynamic detection alarm threshold. Specifically, the contact resistance value in the dynamic detection feature is compared with the preset contact resistance detection result alarm threshold to identify whether there is an abnormal situation in which the contact resistance exceeds the alarm threshold; the insulation resistance value in the dynamic detection feature is compared with the preset insulation detection result alarm threshold to identify whether there is an abnormal situation in which the insulation resistance is lower than the alarm threshold; the withstand voltage test result in the dynamic detection feature is compared with the preset withstand voltage test result alarm threshold to identify whether there is an abnormal situation in which the withstand voltage test fails; the energy consumption meter reading in the dynamic detection feature is compared with the preset energy consumption meter detection result alarm threshold to identify whether there is an abnormal situation in which the energy consumption exceeds the alarm threshold.

[0032] The abnormal situations identified in various tests are integrated to generate a complete abnormal identification result. Based on the abnormal identification result, a second reminder information is generated. The second reminder information includes the abnormal description, specific abnormal detection value and alarm threshold, etc., to facilitate subsequent processing.

[0033] An abnormality reminder of the target low-voltage electrical cabinet is performed according to the first reminder information and the second reminder information.

[0034] Integrate the first reminder information and the second reminder information to generate a comprehensive set of abnormal reminder information. Each reminder information includes the abnormal type, specific abnormal value, possible risk, etc. Set the priority of the reminder information according to the severity and impact range of the abnormality. For example, abnormalities that seriously affect equipment operation are set to high priority, and minor abnormalities are set to low priority. According to system configuration and user needs, relevant personnel are notified in different ways. For example, a reminder window pops up on the detection system interface to prompt maintenance personnel to view the abnormal details, and an email containing the abnormal reminder content is sent to the maintenance team and management personnel to ensure that the abnormalities of the target low-voltage electrical cabinet can be identified, reminded and handled in time, thereby improving the safety and reliability of the system.

[0035] Furthermore, based on a preset test sequence, the target low-voltage electrical cabinet is dynamically tested by multiple independent testing modules to obtain wiring test results and dynamic test value sequences, and the method includes: The preset test order of the multiple independent detection modules is line sequence detection module, relay action detection module, contact resistance detection module, insulation detection module, withstand voltage detection module, and energy consumption meter detection module; the line sequence detection module is used to perform line sequence detection on the target low-voltage electrical cabinet to generate a line sequence detection result; the relay action detection module is used to perform relay action detection on the target low-voltage electrical cabinet to generate a relay action detection result; the line sequence detection result and the relay action detection result are integrated to obtain the wiring detection result; the contact resistance detection module is used to detect the target low-voltage electrical cabinet The low-voltage electrical cabinet performs contact resistance detection to generate a contact resistance detection value sequence; the insulation detection module performs insulation detection on the target low-voltage electrical cabinet to generate an insulation detection value sequence; the withstand voltage detection module performs withstand voltage detection on the target low-voltage electrical cabinet to generate a withstand voltage detection value sequence; the energy consumption meter detection module performs energy consumption meter detection on the target low-voltage electrical cabinet to generate an energy consumption meter detection value sequence; the contact resistance detection value sequence, the insulation detection value sequence, the withstand voltage detection value sequence, and the energy consumption meter detection value sequence are integrated to obtain the dynamic detection value sequence.

[0036] The application software of the automatic detection device for low-voltage electrical cabinets of AC locomotives mainly includes line sequence detection, contact resistance detection, relay action detection, insulation detection, withstand voltage detection, and energy consumption meter detection. Each detection function is an independent module, and the test sequence is line sequence detection module, relay action detection module, contact resistance detection module, insulation detection module, withstand voltage detection module, and energy consumption meter detection module. Enter the homepage, which displays six detection modules side by side. First select the line sequence detection module. If you select other modules, the software will pop up an alarm window and you must pass the line sequence detection before you can perform other operations. The remaining detection modules are carried out in sequence. When all the tests are completed, a pop-up window will pop up to prompt that the test is completed and a report will be automatically generated and stored in the system, which can be viewed through the historical records.

[0037] Line sequence detection uses a certain combination of voltage pulses to output to a certain line under test, and the acquisition part reads all lines. In this way, the connected line will receive a certain electrical signal, while other lines will not receive a signal, thereby judging the connection status. In order to shorten the detection time, multiple detection units will perform detection at the same time, and the output can only be output on one line.

[0038] Relay action detection is to detect whether the relay can be completely closed and released under the specified driving voltage. By outputting a specified voltage to the relay driving end and measuring the contact resistance between the relay contacts, it can be determined whether the relay meets the requirements. The test principle is the same as the subsequent contact resistance. The difference lies in the different driving voltage given to the relay. The normal contact resistance test is the rated driving voltage of the relay, and the minimum driving voltage should be given to the relay at this time. The other processes are similar. Since the contact resistance test is described in detail, it will not be repeated here.

[0039] Integrate the line sequence detection results and relay action detection results to obtain comprehensive wiring detection results.

[0040] Contact resistance detection is to detect the resistance value between a specified pair of wires. When the resistance value is greater than the preset contact resistance threshold, it is unqualified, otherwise it is qualified. The key to contact resistance measurement is the processing of its own fixed error. Because the contact resistance is a small resistance value, as an automatic detection, it is inevitable to design electronic switches, connectors, PCB wiring, etc., which will produce impedance. Considering the small resistance value of the final result, these factors must be processed. Among them, each power board ensures that only the required relay drive voltage is output, and the wiring detection ensures that only the contact resistance and relay drive unit are connected to the test cable.

[0041] Insulation testing is to detect the resistance value of any wire and all other wires (including the ground wire) at a specified voltage. For example, the specified voltage index is set to 550V. When the resistance value is greater than the preset resistance threshold, it is qualified, otherwise it is unqualified and needs to be prompted and rectified. The key to insulation testing is the appropriate charging power. Considering that the distributed capacitance of isolated electrical cabinets is relatively small, the charging time can be appropriately shortened to speed up the detection efficiency.

[0042] Since insulation testing uses a relatively high voltage, incorrect connections may damage some devices. Therefore, the connections of devices not undergoing insulation testing must be disconnected before insulation testing. At the same time, the control cabinet will also output voltage for testing and connection status before testing to ensure the correct voltage and connection before starting the measurement process.

[0043] Insulation testing uses a specified voltage output to a certain line under test, and the acquisition part samples the voltage of all lines. Based on the obtained sampled voltage, the known source voltage and the sampling resistance, the resistance between lines and the line to ground can be obtained by calculation. The resistance value is compared with the standard requirements to obtain the result.

[0044] The withstand voltage test is the maximum leakage current of all lead wires in the target low-voltage electrical cabinet to the casing under a voltage that lasts for a certain period of time. If the leakage current exceeds the standard, it is unqualified. During the withstand voltage test, it is necessary to ensure that the cabinet is reliably grounded and the test cable must be connected to the withstand voltage test interface.

[0045] According to the command of the industrial computer, the withstand voltage generator is enabled to emit the required voltage and detect the voltage. After confirmation, the output switch is turned on to output the voltage to the circuit under test. At this time, the leakage current on the circuit is monitored in real time. If the leakage current exceeds the standard, the voltage output is immediately shut down and the leakage current value and the abnormal detection status are reported; otherwise, until the delay ends, the maximum leakage current during the reporting period and the normal detection status are reported.

[0046] Energy consumption detection is a function of simulating a voltage and current signal input into the energy consumption meter, manually observing whether the indication of the energy consumption meter is reasonable, and thus obtaining the conclusion of energy consumption detection. For example, a 50Hz voltage and current signal can be artificially simulated and input into the energy consumption meter through a transformer (or directly). The given voltage and current are known, and the transformation ratio is also known. The power obtained by the energy consumption meter can be calculated theoretically. After accumulating time, the simulated theoretical electric energy can be obtained. The indication of the energy consumption meter is compared with the theoretical value to determine the result.

[0047] The contact resistance detection value sequence, insulation detection value sequence, withstand voltage detection value sequence, and energy consumption meter detection value sequence are integrated to obtain a comprehensive dynamic detection value sequence.

[0048] Furthermore, the method of performing line sequence detection on the target low-voltage electrical cabinet by the line sequence detection module to generate a line sequence detection result includes: S1: Generate a first detection command according to the wiring logic configuration table, wherein the first detection command includes driving the relay number or not driving the relay; S2: Generate a line sequence voltage based on a preset low voltage constraint, and based on the first detection command, conduct the line sequence voltage to the first measured line, and collect first electrical signal information; S3: Analyze the first electrical signal information, obtain the connection status of the first measured line, and generate a first line sequence detection result by comparing with the wiring logic configuration table; repeat steps S1-S3 in sequence according to the wiring logic configuration table until all measured lines are traversed and the line sequence detection result is obtained.

[0049] According to the schematic diagram, a wiring logic configuration table for the low-voltage electrical cabinet and the detection device is generated, so that the test interface display circuit, the detection device test circuit and the wiring of the low-voltage electrical cabinet correspond one to one. The logic configuration table is saved without changing the schematic diagram of the low-voltage electrical cabinet, and can be used directly for the same electrical cabinet.

[0050] According to the wiring logic configuration table, send a command to detect the first line, which contains the serial number of the driving relay or does not drive the relay. As an integrated test device, the line sequence must use a low voltage that does not affect the performance of the electrical cabinet components, obtain the line sequence voltage generated according to the preset low voltage constraint, conduct the line sequence voltage to the corresponding first tested line, collect and analyze the electrical signal information of all lines, obtain the connection status of each line, and report the connection status to the industrial computer. The industrial computer generates the first line sequence detection result according to the reported status and the wiring logic configuration table. Repeat the above steps in sequence according to the wiring logic configuration table until all the tested lines are traversed and the detection is completed, and the line sequence detection result is obtained.

[0051] Furthermore, before performing line sequence detection, the method includes: Generate a manual detection instruction, based on which the tester is required to manually confirm the state of the relay drive line and obtain manual detection result feedback information; when the manual detection result feedback information is that the detection is abnormal, shut down the voltage output and report to the industrial computer to prohibit line sequence detection; when the manual detection result feedback information is that the detection is normal, start the line sequence detection.

[0052] Considering that the line sequence needs to detect the connection status of each contact when each relay is driven or stopped, the relay driving operation is also required in the line sequence test. Before that, in order to prevent the relay driving power supply from being incorrectly wired and damaging the electrical cabinet components, the relay driving line should be manually checked for correctness. Specifically, the operator selects the line sequence test function, and a manual detection instruction pops up, requiring manual confirmation of the relay driving line status, and sends a line sequence test preparation command at the same time. At this time, manual detection without driving the relay is allowed.

[0053] During the manual detection process, each power control board controls the output line sequence voltage and monitors the voltage status on the output power line to prevent high voltage output. Once the voltage is abnormal, the voltage output is immediately turned off and reported to the industrial computer to prohibit the line sequence detection function from continuing to prevent damage to the device. On the contrary, if the detection is normal, the normal status is sent to the industrial computer, and subsequent operations can be performed. After confirming that the relay drive line is correct, start the line sequence detection.

[0054] Furthermore, the contact resistance detection module is used to detect the contact resistance of the target low-voltage electrical cabinet to generate a contact resistance detection value sequence, and the method includes: After confirming that the connection status of the test cable is normal, start the contact resistance detection of the contact resistance detection module, wherein the contact resistance detection module includes a milliohm tester; X1: generate a first loop detection command according to the wiring logic configuration table, wherein the first loop detection command includes a driving relay serial number; X2: based on the first loop detection command, after driving the corresponding relay, the milliohm tester is connected to the first loop, and the first milliohm meter value is read after a delay to obtain the first loop resistance; X3: turn off the relay drive, obtain the first fixed error of the first loop, calculate the first difference between the first loop resistance and the first fixed error, obtain the first contact resistance value of the first loop, and compare with the wiring logic configuration table to generate a first contact resistance detection result; according to the wiring logic configuration table, repeat steps X1-X3 in sequence until all loops are traversed to obtain the contact resistance detection result.

[0055] When performing contact resistance detection, each power board needs to ensure that only the required relay drive voltage is output, and the wiring detection ensures that only the contact resistance and relay drive unit are connected to the test cable. After confirming that the test cable connection status is normal, start the contact resistance detection. The contact resistance detection uses an electronic switch to turn on the corresponding circuit, which is connected to the milliohm tester. The milliohm tester measures the resistance of the circuit, and then the industrial computer uses the result to subtract the fixed error of the circuit to obtain the true value of the contact resistance of the circuit.

[0056] Start the contact resistance detection. The industrial computer generates the first loop detection command according to the wiring logic configuration table, including the driving relay serial number. Based on the first loop detection command, after driving the corresponding relay, the milliohm tester and the first loop are turned on. After a delay, the first milliohm meter value is read to obtain the first loop resistance. At this time, the relay drive is turned off, and the collected value is reported to the industrial computer. The industrial computer subtracts the first fixed error of the corresponding loop from the returned value to obtain the first contact resistance value of the loop. According to the wiring logic configuration table, the above detection process is repeated in sequence until all the tested loops are traversed, the detection is completed, and the contact resistance detection result is obtained.

[0057] Furthermore, the method further comprises: The system setting module also includes a user management submodule and a permission management submodule; the user management submodule is used to input the information of the tester; and the permission management submodule is used to allocate the permission of the tester.

[0058] The development of the application software for the automatic detection device of the low-voltage electrical cabinet of AC locomotives is an important part of realizing automated detection. In order to ensure that the software logic structure, operation functions and development progress can meet the actual needs, the application software for the automatic detection device of the low-voltage electrical cabinet of AC locomotives mainly includes seven modules: line sequence detection, contact resistance detection, relay action detection, insulation detection, withstand voltage detection, energy consumption meter detection and system settings. Among them, the system setting module includes a user management submodule and a permission management submodule in addition to the aforementioned parameter configuration submodule. Among them, the user management submodule is responsible for the entry of test personnel information, and the permission management submodule is responsible for the allocation of administrator permissions. The administrator has the functions of data deletion and parameter setting more than the operating personnel. After entering the system setting module, you can select user management and add and delete personnel through the user management submodule; you can choose whether to grant administrator permissions to users through the permission management submodule.

[0059] Furthermore, the method further comprises: A data docking interface for the LMIS system is reserved; the target cabinet number of the target low-voltage electrical cabinet is obtained, and the target cabinet number, the wiring detection result, the dynamic detection numerical sequence, and the first reminder information and the second reminder information are summarized as a target detection record; through the data docking interface for the LMIS system, the target detection record is sent to the LMIS system for data display.

[0060] Design and reserve an interface for docking with LMIS (management information system) in the detection system. The interface design should comply with the data format and communication protocol requirements of the LMIS system. Read the unique identifier of the target low-voltage electrical cabinet, i.e. the target cabinet number, from the detection system, summarize the target cabinet number, wiring detection results, dynamic detection numerical sequence, first reminder information and second reminder information to form a complete target detection record, package the summarized target detection records, format them into a data format that can be recognized and parsed by the LMIS system, send the packaged target detection records to the LMIS system through the reserved LMIS system data docking interface, and display the data in the LMIS system to ensure that the detection records can be effectively parsed and displayed. The specific display content includes the target cabinet number, detection results, abnormal reminders, etc., which are convenient for management personnel to view and analyze.

[0061] In summary, the automatic detection method for a low-voltage electrical cabinet provided in the embodiment of the present application has the following technical effects: Through the method of multi-module independent detection and preset test sequence, the wiring status and dynamic characteristics of the target low-voltage electrical cabinet are automatically detected, which reduces manual intervention, improves the degree of automation and accuracy of detection, and ensures the comprehensiveness of detection; the parameter configuration submodule of the system setting module provides a flexible alarm threshold configuration function, allowing the detection alarm threshold to be adjusted according to specific needs, and optimized configuration to improve the adaptability and flexibility of the system; the dynamic detection data is processed in real time through the data docking adapter, and automatic abnormality identification is performed based on dynamic detection characteristics and alarm thresholds, and timely first reminder information and second reminder information are generated to achieve rapid abnormality identification and reminders, thereby improving the system's response speed and fault handling capabilities; by transmitting the detection data to the LMIS system in real time and displaying the data, the efficiency of data management and display is improved.

[0062] Embodiment 2 is based on the same inventive concept as the automatic detection method for a low-voltage electrical cabinet in the above embodiment. Figure 2 As shown, an embodiment of the present application provides a low-voltage electrical cabinet automatic detection system, the system is communicatively connected with an AC locomotive low-voltage electrical cabinet automatic detection device, and the system includes: An electrical connection unit 10, the electrical connection unit 10 is used to communicate the electrical connection between the automatic detection device of the AC locomotive low-voltage electrical cabinet and the target low-voltage electrical cabinet through a test cable; a dynamic detection unit 20, the dynamic detection unit 20 is used to activate the automatic detection device of the AC locomotive low-voltage electrical cabinet, based on a preset test sequence, dynamically detect the target low-voltage electrical cabinet through multiple independent detection modules, and obtain the wiring detection result and the dynamic detection value sequence; a first reminder information generation unit 30, the first reminder information generation unit 30 is used to generate a first reminder information according to the line abnormality state in the wiring detection result; a data processing unit 40, the data processing unit 40 is used to receive the dynamic detection value sequence in real time through a data docking adapter, and perform Data processing, generating dynamic detection features; an alarm threshold calling unit 50, the alarm threshold calling unit 50 is used to call the dynamic detection alarm threshold through the parameter configuration submodule of the system setting module, wherein the dynamic detection alarm threshold includes the contact resistance detection result alarm threshold, the insulation detection result alarm threshold, the withstand voltage detection result alarm threshold, and the energy consumption meter detection result alarm threshold; a second reminder information generation unit 60, the second reminder information generation unit 60 is used to identify the abnormality of the dynamic detection feature based on the dynamic detection alarm threshold, and generate a second reminder information according to the abnormal identification result; an abnormal reminder unit 70, the abnormal reminder unit 70 is used to provide abnormal reminder of the target low-voltage electrical cabinet according to the first reminder information and the second reminder information.

[0063] Furthermore, the system further includes a dynamic detection value sequence acquisition module to perform the following operation steps: The preset test order of the multiple independent detection modules is line sequence detection module, relay action detection module, contact resistance detection module, insulation detection module, withstand voltage detection module, and energy consumption meter detection module; the line sequence detection module is used to perform line sequence detection on the target low-voltage electrical cabinet to generate a line sequence detection result; the relay action detection module is used to perform relay action detection on the target low-voltage electrical cabinet to generate a relay action detection result; the line sequence detection result and the relay action detection result are integrated to obtain the wiring detection result; the contact resistance detection module is used to detect the target low-voltage electrical cabinet The low-voltage electrical cabinet performs contact resistance detection to generate a contact resistance detection value sequence; the insulation detection module performs insulation detection on the target low-voltage electrical cabinet to generate an insulation detection value sequence; the withstand voltage detection module performs withstand voltage detection on the target low-voltage electrical cabinet to generate a withstand voltage detection value sequence; the energy consumption meter detection module performs energy consumption meter detection on the target low-voltage electrical cabinet to generate an energy consumption meter detection value sequence; the contact resistance detection value sequence, the insulation detection value sequence, the withstand voltage detection value sequence, and the energy consumption meter detection value sequence are integrated to obtain the dynamic detection value sequence.

[0064] Furthermore, the system further includes a line sequence detection result acquisition module to perform the following operation steps: S1: Generate a first detection command according to the wiring logic configuration table, wherein the first detection command includes driving the relay number or not driving the relay; S2: Generate a line sequence voltage based on a preset low voltage constraint, and based on the first detection command, conduct the line sequence voltage to the first measured line, and collect first electrical signal information; S3: Analyze the first electrical signal information, obtain the connection status of the first measured line, and generate a first line sequence detection result by comparing with the wiring logic configuration table; repeat steps S1-S3 in sequence according to the wiring logic configuration table until all measured lines are traversed and the line sequence detection result is obtained.

[0065] Furthermore, the system also includes a safety check module to perform the following steps: Generate a manual detection instruction, based on which the tester is required to manually confirm the state of the relay drive line and obtain manual detection result feedback information; when the manual detection result feedback information is that the detection is abnormal, shut down the voltage output and report to the industrial computer to prohibit line sequence detection; when the manual detection result feedback information is that the detection is normal, start the line sequence detection.

[0066] Furthermore, the system further includes a contact resistance detection result acquisition module to perform the following operation steps: After confirming that the connection status of the test cable is normal, start the contact resistance detection of the contact resistance detection module, wherein the contact resistance detection module includes a milliohm tester; X1: generate a first loop detection command according to the wiring logic configuration table, wherein the first loop detection command includes a driving relay serial number; X2: based on the first loop detection command, after driving the corresponding relay, the milliohm tester is connected to the first loop, and the first milliohm meter value is read after a delay to obtain the first loop resistance; X3: turn off the relay drive, obtain the first fixed error of the first loop, calculate the first difference between the first loop resistance and the first fixed error, obtain the first contact resistance value of the first loop, and compare with the wiring logic configuration table to generate a first contact resistance detection result; according to the wiring logic configuration table, repeat steps X1-X3 in sequence until all loops are traversed to obtain the contact resistance detection result.

[0067] Furthermore, the system also includes a tester management module to perform the following operation steps: The system setting module also includes a user management submodule and a permission management submodule; the user management submodule is used to input the information of the tester; and the permission management submodule is used to allocate the permission of the tester.

[0068] Furthermore, the system also includes a data display module to perform the following operation steps: A data docking interface for the LMIS system is reserved; the target cabinet number of the target low-voltage electrical cabinet is obtained, and the target cabinet number, the wiring detection result, the dynamic detection numerical sequence, and the first reminder information and the second reminder information are summarized as a target detection record; through the data docking interface for the LMIS system, the target detection record is sent to the LMIS system for data display.

[0069] Through the above detailed description of a method for automatic detection of a low-voltage electrical cabinet in this specification, those skilled in the art can clearly understand a system for automatic detection of a low-voltage electrical cabinet in this embodiment. Since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0070] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for automatic detection of low-voltage electrical cabinets, characterized in that: The method is applied to a low-voltage electrical cabinet automatic detection system, the system is communicatively connected with an AC locomotive low-voltage electrical cabinet automatic detection device, and the method comprises: Communicate the electrical connection between the automatic detection device of the AC locomotive low-voltage electrical cabinet and the target low-voltage electrical cabinet through a test cable; Activate the automatic detection device of the AC locomotive low-voltage electrical cabinet, perform dynamic detection on the target low-voltage electrical cabinet through multiple independent detection modules based on a preset test sequence, and obtain wiring detection results and dynamic detection value sequences; Generate first reminder information according to the abnormal line status in the wiring detection result; The dynamic detection value sequence is received in real time through a data docking adapter, and data processing is performed to generate dynamic detection features; The dynamic detection alarm threshold is retrieved through the parameter configuration submodule of the system setting module, wherein the dynamic detection alarm threshold includes the contact resistance detection result alarm threshold, the insulation detection result alarm threshold, the withstand voltage detection result alarm threshold, and the energy consumption meter detection result alarm threshold; Performing abnormality identification on the dynamic detection feature based on the dynamic detection alarm threshold, and generating second reminder information according to the abnormality identification result; An abnormality reminder of the target low-voltage electrical cabinet is performed according to the first reminder information and the second reminder information.

2. A low-voltage electrical cabinet automatic detection method as claimed in claim 1, characterized in that: Based on the preset test sequence, the target low-voltage electrical cabinet is dynamically tested by multiple independent testing modules to obtain wiring test results and dynamic test value sequences, and the method includes: The preset test order of the multiple independent detection modules is line sequence detection module, relay action detection module, contact resistance detection module, insulation detection module, withstand voltage detection module, and energy consumption meter detection module; Performing line sequence detection on the target low-voltage electrical cabinet through the line sequence detection module to generate a line sequence detection result; Perform relay component action detection on the target low-voltage electrical cabinet through the relay component action detection module to generate a relay component action detection result; Integrate the line sequence detection result and the relay component action detection result to obtain the wiring detection result; Performing contact resistance detection on the target low-voltage electrical cabinet by means of the contact resistance detection module to generate a contact resistance detection value sequence; Performing insulation detection on the target low-voltage electrical cabinet through the insulation detection module to generate an insulation detection value sequence; Performing a withstand voltage test on the target low-voltage electrical cabinet through the withstand voltage test module to generate a withstand voltage test value sequence; Performing energy consumption meter detection on the target low-voltage electrical cabinet through the energy consumption meter detection module to generate an energy consumption meter detection value sequence; The contact resistance detection value sequence, the insulation detection value sequence, the withstand voltage detection value sequence, and the energy consumption meter detection value sequence are integrated to obtain the dynamic detection value sequence.

3. A low-voltage electrical cabinet automatic detection method as claimed in claim 2, characterized in that: The method of performing line sequence detection on the target low-voltage electrical cabinet by the line sequence detection module to generate a line sequence detection result includes: S1: Generate a first detection command according to a wiring logic configuration table, wherein the first detection command includes a driving relay sequence number or not driving a relay; S2: Based on a preset low voltage constraint, generate a line sequence voltage, and based on a first detection command, conduct the line sequence voltage to a first tested line to collect first electrical signal information; S3: parsing the first electrical signal information, obtaining the connection state of the first tested line, and generating a first line sequence detection result by comparing the wiring logic configuration table; Repeat steps S1-S3 in sequence according to the wiring logic configuration table until all the tested lines are traversed to obtain the line sequence detection result.

4. A low-voltage electrical cabinet automatic detection method as claimed in claim 3, characterized in that: Before performing line sequence detection, the method includes: Generate a manual detection instruction, based on which a tester is required to manually confirm the state of the relay drive line and obtain manual detection result feedback information; When the manual detection result feedback information is detection abnormality, the voltage output is turned off and the industrial computer is reported to prohibit line sequence detection; When the manual detection result feedback information indicates that the detection is normal, the line sequence detection is started.

5. A low-voltage electrical cabinet automatic detection method as claimed in claim 2, characterized in that: The contact resistance detection module is used to detect the contact resistance of the target low-voltage electrical cabinet to generate a contact resistance detection value sequence, and the method includes: After confirming that the connection state of the test cable is normal, starting the contact resistance detection of the contact resistance detection module, wherein the contact resistance detection module includes a milliohm tester; X1: Generate a first circuit detection command according to the wiring logic configuration table, wherein the first circuit detection command includes a driving relay serial number; X2: Based on the first circuit detection command, after driving the corresponding relay, the milliohm tester is connected to the first circuit, and the value of the first milliohm meter is read after a delay to obtain the resistance of the first circuit; X3: Turn off the relay drive, obtain a first fixed error of the first loop, calculate a first difference between the first loop resistance and the first fixed error, obtain a first contact resistance value of the first loop, and generate a first contact resistance detection result by comparing with the wiring logic configuration table; According to the wiring logic configuration table, steps X1-X3 are repeated in sequence until all loops are traversed to obtain the contact resistance detection result.

6. A low-voltage electrical cabinet automatic detection method as claimed in claim 1, characterized in that: The method further comprises: The system setting module also includes a user management submodule and a permission management submodule; Enter the information of the tester through the user management submodule; The authority allocation of testers is performed through the authority management submodule.

7. A low-voltage electrical cabinet automatic detection method as claimed in claim 1, characterized in that: The method further comprises: Reserve the data docking interface of LMIS system; Obtaining a target cabinet number of a target low-voltage electrical cabinet, and summarizing the target cabinet number, the wiring detection result, the dynamic detection numerical sequence, and the first reminder information and the second reminder information into a target detection record; The target detection record is sent to the LMIS system through the LMIS system data docking interface for data display.

8. A low voltage electrical cabinet automatic detection system, characterized in that: The system is connected to the automatic detection device of the low-voltage electrical cabinet of the AC locomotive in communication, and is used to implement the automatic detection method of the low-voltage electrical cabinet according to any one of claims 1 to 7. The system comprises: An electrical connection unit, the electrical connection unit being used to communicate the electrical connection between the automatic detection device for the AC locomotive low-voltage electrical cabinet and the target low-voltage electrical cabinet through a test cable; A dynamic detection unit, the dynamic detection unit is used to activate the automatic detection device of the AC locomotive low-voltage electrical cabinet, and based on a preset test sequence, dynamically detect the target low-voltage electrical cabinet through multiple independent detection modules to obtain a wiring detection result and a dynamic detection value sequence; A first reminder information generating unit, the first reminder information generating unit is used to generate first reminder information according to the line abnormality state in the wiring detection result; A data processing unit, the data processing unit is used to receive the dynamic detection value sequence in real time through a data docking adapter, perform data processing, and generate dynamic detection features; An alarm threshold retrieving unit, the alarm threshold retrieving unit is used to retrieve the dynamic detection alarm threshold through the parameter configuration submodule of the system setting module, wherein the dynamic detection alarm threshold includes the contact resistance detection result alarm threshold, the insulation detection result alarm threshold, the withstand voltage detection result alarm threshold, and the energy consumption meter detection result alarm threshold; a second reminder information generating unit, the second reminder information generating unit being used to identify anomalies of the dynamic detection feature based on the dynamic detection alarm threshold, and to generate second reminder information according to anomaly identification results; An abnormality reminder unit is used to provide an abnormality reminder for the target low-voltage electrical cabinet according to the first reminder information and the second reminder information.

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