A substation secondary screen cabinet operation safety management and control system and method

Abstract

The application discloses a substation secondary screen cabinet operation safety management and control system and method, and belongs to the technical field of substation safety operation and maintenance. In order to solve the problem that the existing secondary screen cabinet operation highly depends on manual checking, cannot realize real-time monitoring and early warning on the misopening of cabinet doors at non-working sites, and is easy to cause wrong interval walking, protection misoperation tripping and other safety accidents, the management and control system of the application adopts a four-layer architecture of a hardware layer, a data layer, a business logic layer and a display layer, analyzes and executes a work ticket electronic document, matches a screen position site library, generates an authorized work screen cabinet set, realizes real-time collection of the opening and closing states of the cabinet doors of each secondary screen cabinet, carries out consistency checking with the authorized set, triggers a precise sound and light early warning when the cabinet doors at non-working sites are opened, and can automatically identify cross operation sites and visually mark them in stages. Without changing the working habits of operation personnel, the application is fast in response, effectively reduces the risk of misentry into an interval, and significantly improves the intelligence and reliability of substation operation safety management and control.

Description

Technical Field

[0001] This invention relates to the field of substation safety operation and maintenance technology, specifically to a substation secondary cabinet operation safety management system and method. Background Technology

[0002] Substation secondary equipment serves as the carrier for core functions such as relay protection, operation monitoring and control, and fault analysis, and is a key support for ensuring the safe and stable operation of the power system. As the physical integrated unit of secondary equipment and secondary circuits, the safe operation and management of secondary equipment cabinets directly affect the reliability of the power grid. During on-site operations such as periodic inspections, maintenance, and defect handling in substations, personnel need to open cabinet doors to perform equipment debugging, circuit verification, and other operations. If a non-operating cabinet is accidentally opened, it can easily lead to accidental contact or short-circuiting of energized secondary circuits, potentially causing serious accidents such as protection malfunctions and circuit breaker tripping, severely threatening the safety of the power grid.

[0003] Currently, the safety risks of accidentally entering operating bays and misoperating non-working cabinets during substation field operations have not been effectively curbed, and similar accidents occur repeatedly. A typical accident manifests as follows: during routine maintenance of secondary equipment in multiple bays, when work teams move across areas, they fail to strictly verify the cabinet location information and safety measures, mistakenly opening the doors of protection cabinets in non-target bays and commencing work. This leads to malfunctions of protection devices, tripping of the corresponding line circuit breaker, and abnormal grid operation. Such accidents reveal that current safety management of secondary cabinet operations relies heavily on personnel self-discipline and manual management, lacking effective technical prevention and control measures, and exhibiting inherent deficiencies in risk defense capabilities.

[0004] The technical limitations of the existing control system are mainly reflected in three aspects: First, there is insufficient spatial control capability in scenarios with multiple concurrent operations. When multiple work orders are carried out simultaneously within the same substation, the boundaries of the work areas are only roughly demarcated by physical means such as barriers and signs. The flow of personnel on site is complex, and the identification of the work area relies on subjective judgment. There is a lack of digital spatial boundary control and personnel location verification mechanisms, which can easily lead to situations where workers cross the boundary and enter non-work intervals. The difficulty of on-site control and the risk of errors increase simultaneously.

[0005] Second, there is a lack of real-time monitoring and proactive early warning capabilities for cabinet status. Current substation secondary operation safety management follows the relevant requirements of the "Electrical Safety Work Regulations," primarily relying on organizational measures and traditional technical measures such as work permit systems, safety briefings, safety barriers, and warning signs. These are all preventative control measures and lack online monitoring capabilities for cabinet door opening status, making it impossible to identify and issue immediate warnings for unauthorized openings. Once an unauthorized opening occurs, intervention is not possible immediately, resulting in a significant lag in risk management and making it difficult to effectively prevent accidents from escalating.

[0006] Third, there is insufficient technical control over human error in the work process. In the process of changing work locations and rotating between multiple screens, screen verification relies entirely on paper safety measure sheets and personnel memory, lacking automated screen identity verification and work permission verification. This fails to mitigate the risk of human error from a technical perspective, becoming the core cause of frequent misoperation accidents. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a substation secondary cabinet operation safety management system and method, so as to accurately control and intelligently warn of the opening behavior of secondary cabinets and reduce the operation safety risks.

[0008] To solve the above-mentioned technical problems, the present invention provides a substation secondary switchgear operation safety management system, comprising: The hardware layer is used to collect data on the opening and closing status of the cabinet doors of each secondary cabinet in the station. The data layer is used to store the location database of pre-configured secondary cabinets and the electronic documents of work orders in the execution state. The location database contains the unique identifier of each secondary cabinet in the station and the corresponding cabinet position name. The business logic layer is used to extract and match the text of the electronic work order document to generate an authorized work cabinet set; it is also used to perform consistency verification between the cabinet door opening and closing status data and the authorized work cabinet set, and generate an early warning signal when it is detected that a secondary cabinet with its door open does not belong to the authorized work cabinet set. The display layer is used to receive the warning signal and output a safety warning prompt.

[0009] Preferably, the hardware layer includes several contact-type micro-motion limit switches, a digital input module, and a monitoring terminal; each door of each secondary cabinet is equipped with one of the contact-type micro-motion limit switches, and all contact-type micro-motion limit switches in the same cabinet are connected in parallel to form an OR logic output circuit, outputting an open status signal when any door is opened; the contact-type micro-motion limit switches are connected to the digital input module through shielded cables, and the digital input module is communicatively connected to the monitoring terminal to upload the door opening and closing status data to the business logic layer.

[0010] Preferably, the business logic layer generates the authorized work cabinet set in the following way: Standardized cleaning processing is performed on the text extracted from the electronic work order document, including character format unification, deletion of blank characters, deletion of parentheses and internal content, and deletion of punctuation marks; keyword matching is performed based on the cleaned text and the screen names in the location database, and a statistical rule is adopted that if the same screen name appears once or more in a single work order, it is counted as one occurrence, and the frequency of work orders for each screen is counted, and screen cabinets with a frequency greater than or equal to 1 are aggregated into the authorized work cabinet set.

[0011] Preferably, the display layer is a graphical user interface that displays the working status of all secondary screen cabinets in a grid layout using illuminated signs. The display layer uses a four-level color coding system based on the frequency of appearance of work tickets for each screen position: gray for 0 appearances, blue for 1 appearance, yellow for 2 appearances, and red for 3 or more appearances. Each illuminated sign is simultaneously marked with the corresponding frequency value.

[0012] This invention also provides a method for safety management and control of secondary switchgear operations in substations, applied to the substation secondary switchgear operation safety management and control system, comprising: Step S1: Obtain the pre-configured location database of substation secondary switch cabinets, wherein the location database contains the unique identifier of each secondary switch cabinet in the substation and the corresponding switch position name; Step S2: Extract text from at least one electronic work order document in execution state, match and identify the extracted text based on the secondary cabinet location database, determine the work cabinets covered by each work order, and generate an authorized work cabinet set. Step S3: Obtain real-time data on the opening and closing status of the cabinet doors of each secondary cabinet within the station; Step S4: Perform a consistency check between the real-time door opening and closing status data of each secondary cabinet and the authorized work cabinet set. When it is detected that a secondary cabinet with its door open does not belong to the authorized work cabinet set, a safety warning is triggered.

[0013] Preferably, step S2 specifically includes: The extracted work order text is subjected to standardized cleaning processing, which includes converting it to lowercase characters, deleting whitespace characters, deleting Chinese and English parentheses and their internal content, deleting punctuation marks, and retaining only Chinese characters, letters and numbers. After performing the same standardized cleaning process on the screen names in the location database, keyword matching is performed on the cleaned text of each work order. The statistical rule is adopted that if the same screen position name appears once or more in a single work order, it is counted as one time. The frequency of each secondary screen cabinet's work order is accumulated, and the screen cabinets with a frequency greater than or equal to 1 are summarized to generate an authorized work screen cabinet set.

[0014] Preferably, step S2 further includes: Based on the frequency of work orders for each secondary display cabinet, the illuminated signs in the graphical user interface are displayed with four levels of color coding: gray for 0 occurrences, blue for 1 occurrence, yellow for 2 occurrences, and red for 3 or more occurrences. Each illuminated sign is simultaneously marked with the corresponding frequency value.

[0015] Preferably, step S3 specifically includes: The cabinet door opening and closing status signals are collected by parallel contact micro-motion limit switches installed on each cabinet door, and then uploaded to the monitoring terminal after being converted by the digital input module. An independent sub-thread is used to collect the door opening and closing status data of all secondary cabinets in a preset polling cycle. The collected data is then passed to the main thread for consistency verification logic through a thread-safe queue.

[0016] Preferably, in step S4, the safety warning is triggered by a dual visual and auditory linkage mechanism: the visual warning includes a red flashing sign on the corresponding screen position and a pop-up warning prompt, and the auditory warning is a continuous buzzer sound; the alarm action is triggered only once during the continuous opening of the cabinet door of the same screen, and the alarm state is deactivated after the cabinet door is closed.

[0017] Preferably, after obtaining the pre-configured location database of substation secondary switchgear in step S1, the method further includes: Load the location library and construct a mapping list of "serial number - screen location name"; Initialize the graphical user interface and generate the light sign display frame for each screen cabinet in a grid layout according to the sequence number in the location library.

[0018] The beneficial effects of this invention are as follows: By automatically parsing work order documents and employing a robust location frequency statistics algorithm, this invention can automatically identify overlapping work locations corresponding to multiple work orders and visually label them with hierarchical color coding, effectively solving the problems of difficult work scope identification and challenging on-site management under multi-shift parallel operations. It combines work order authorization scope identification with real-time acquisition of cabinet door opening and closing status to construct a dual-dimensional consistency verification mechanism, enabling 24 / 7 real-time monitoring of the status of all station protection cabinet doors. When a cabinet door in a non-working location is opened, an audible and visual alarm with precise cabinet location indication is triggered within 1 second, facilitating rapid response by maintenance personnel and preventing misoperation before it occurs, thus reducing the safety risk of equipment tripping due to incorrect intervals. The system retains complete alarm records, providing data support for post-event safety analysis. Furthermore, it does not require changes to the existing work habits of on-site personnel, achieving seamless intelligent safety monitoring, promoting the upgrade of substation secondary operation safety management from manual control to technical prevention, and significantly improving the inherent safety level of on-site operations. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the architecture of a substation secondary switchgear operation safety management system according to Embodiment 1 of the present invention.

[0021] Figure 2 This is a schematic diagram of the address light sign in the GUI interface of this invention embodiment.

[0022] Figure 3 This is a flowchart illustrating a method for safe operation control of secondary switchgear in substations, according to Embodiment 2 of the present invention.

[0023] Figure 4 This is a schematic diagram of the system operation process in an embodiment of the present invention. Detailed Implementation

[0024] The following description of the embodiments is taken with reference to the accompanying drawings, which illustrate specific embodiments in which the invention can be implemented.

[0025] This invention is applied to the on-site operation safety management scenario of secondary protection cabinets in substations. The system adopts a four-layer architecture design consisting of hardware layer, data layer, business logic layer, and display layer. Through the core logic of "automatic identification of work order authorization scope + real-time perception of cabinet door physical status + dual-dimensional consistency verification", it realizes automatic identification and immediate warning of cabinet opening behavior in non-working locations.

[0026] Please refer to Figure 1 As shown, Embodiment 1 of the present invention provides a substation secondary switchgear operation safety management system, comprising: The hardware layer is used to collect data on the opening and closing status of the cabinet doors of each secondary cabinet in the station. The data layer is used to store a pre-configured secondary cabinet location database and electronic work order documents in the execution state. The location database contains the unique identifier of each secondary cabinet in the station and the corresponding cabinet position name. The business logic layer is used to extract and match the text of the electronic work order document to generate an authorized work cabinet set; it is also used to perform consistency verification between the cabinet door opening and closing status data and the authorized work cabinet set, and generate an early warning signal when it is detected that a secondary cabinet with its door open does not belong to the authorized work cabinet set. The display layer is used to receive the warning signal and output a safety warning prompt.

[0027] Specifically, the hardware layer provides the system with physical status awareness and data transmission capabilities. Deployed in the substation's secondary equipment room, it is responsible for collecting the opening and closing status of all secondary cabinet doors and uploading the data to the upper layer. The specific hardware configuration and connection relationships of this layer are as follows: Cabinet door status detection element: A contact-type micro-switch with normally open / normally closed contacts is used, with one switch installed for each cabinet door. When a cabinet contains multiple doors (e.g., a single front door + double rear doors), all limit switches are connected in parallel to form an OR logic output circuit: the circuit outputs a high level when any cabinet door is open, and a low level when all cabinet doors are closed. A 0.1μF capacitor is connected in parallel at the node of each limit switch to eliminate contact sparks and mechanical vibration interference.

[0028] Signal transmission and power supply components: RVVP shielded twisted pair cable is used as the signal transmission cable. The limit switch signal lines of each cabinet are collected and connected to the cabinet terminal block and then connected to the digital acquisition module. The system is equipped with a 24V DC power supply module to provide working power for the entire status acquisition circuit.

[0029] Digital signal acquisition equipment: USB digital input modules supporting the Modbus RTU protocol are used. The number of module channels is no less than the total number of secondary cabinets in the station, and the status signals of each cabinet are connected to the corresponding input channels.

[0030] Monitoring terminal equipment: A monitoring computer running Windows operating system is used, equipped with an independent monitor, preferably a dedicated secondary screen to display the monitoring interface, serving as the platform for upper-level software operation and the core for data processing. After all hardware devices are installed and wired on the cabinet side, they are connected to the monitoring computer to complete system integration and debugging.

[0031] The data layer provides basic data support for the system, storing all the baseline and business data required for system operation, specifically including two types of data: Substation protection panel location database: Stored in Excel format, containing two columns of data: "Serial Number" and "Work Location Name". The serial number serves as a unique identifier for each secondary panel, and the work location name corresponds one-to-one with the actual physical name of the panel on site, such as "1P #1 Main Transformer Protection Panel", "2P #2 Main Transformer Protection Panel", "9P Waveform Recorder Panel", etc.

[0032] Table 1. Protection Screen Position Database

[0033] The work order document set in execution: All work orders exported from the production management system that are in a permitted execution state. Each work order is an independent PDF file, which are centrally stored in a designated directory and serve as the data source for work scope identification.

[0034] The business logic layer is the core computing layer of the system, deployed within the monitoring computer. It is responsible for data processing, logical judgment, and alert triggering, specifically performing the following operations: Work order parsing and location frequency statistics: Batch read work order PDF files, complete text extraction, standardized cleaning, keyword matching and frequency statistics, and generate a set of authorized work screen cabinets for the entire site and work order frequency data for each screen location.

[0035] Real-time acquisition of DI (Digital Input) status: Adopting a multi-threaded asynchronous architecture, the background thread polls the USB digital input module to obtain the opening and closing status of each cabinet door in real time, and cross-thread data transmission is achieved through a thread-safe queue.

[0036] Consistency verification and alarm logic judgment: The real-time cabinet door status is verified bidirectionally with the authorized work panel cabinet set. The alarm is triggered based on the dual-condition logic of "cabinet door is open and not in the work location". It also has anti-shaking and anti-duplication mechanisms.

[0037] System scheduling and process control: responsible for program startup initialization, timing scheduling of each module, exception handling and lifecycle management, to ensure the stable and continuous operation of the system.

[0038] The presentation layer is the system's human-computer interaction interface, i.e., the graphical user interface (GUI), deployed on the monitor of the monitoring computer, such as... Figure 2 As shown, the grid-layout illuminated signs serve as the core display format, intuitively presenting the status of all screens across the site, work frequency statistics, and alarm information. It supports various display and warning formats, including tiered color coding for the illuminated signs, flashing highlights for abnormal states, pop-up warnings, and buzzer alerts. As an example, the display layer uses a four-level color coding system based on the frequency of work tickets appearing at each screen: gray for 0 occurrences, blue for 1 occurrence, yellow for 2 occurrences, and red for 3 or more occurrences. Each illuminated sign simultaneously displays the corresponding frequency value.

[0039] Please refer to again Figure 3 As shown, Embodiment 2 of the present invention provides a method for safety management and control of substation secondary switchgear operations, applied to the substation secondary switchgear operation safety management and control system described in Embodiment 1 above. The method includes: Step S1: Obtain the pre-configured substation secondary switch cabinet location database, which contains the unique identifier of each secondary switch cabinet in the substation and the corresponding switch position name; Step S2: Extract text from at least one electronic work order document in execution state, match and identify the extracted text based on the secondary cabinet location database, determine the work cabinets covered by each work order, and generate an authorized work cabinet set. Step S3: Obtain real-time data on the opening and closing status of the cabinet doors of each secondary cabinet within the station; Step S4: Perform a consistency check between the real-time door opening and closing status data of each secondary cabinet and the authorized work cabinet set. When it is detected that a secondary cabinet with its door open does not belong to the authorized work cabinet set, a safety warning is triggered.

[0040] The following combination Figure 4 The system operation flow shown provides a detailed explanation of the specific implementation methods for each step.

[0041] Step S1 is used to obtain a pre-configured location database of substation secondary switchgear to construct baseline data for switchgear identification, providing a foundation for subsequent text matching and status mapping. As mentioned above, the location database is stored in Excel file format, containing two columns of data: "Serial Number" and "Work Location Name". The serial number serves as a unique identifier for each secondary switchgear, and the work location name corresponds one-to-one with the actual physical name of the switchgear on site.

[0042] After obtaining the pre-configured location database of substation secondary cabinets, the program first loads the location database Excel file, reads all cabinet position data using the openpyxl library, and constructs a one-to-one mapping list of "serial number - cabinet position name" to complete the memory loading of basic data. As a preferred implementation, after completing the mapping list construction, the program initializes the graphical user interface and generates the corresponding indicator light display controls for each cabinet in a grid layout according to the serial number order in the location database; for example... Figure 2 As shown, during the initialization phase, all illuminated signs are displayed with the default background color and labeled with the corresponding screen location name, completing the interface framework construction and providing a carrier for subsequent status display and early warning output.

[0043] Step S2 is used to generate a set of authorized work cabinets, that is, to automatically parse the work ticket document to determine the scope of legal operations, so as to realize the joint verification of "work ticket - physical status".

[0044] Specifically, all authorized work orders in the execution state are exported from the substation production management system. As an example, each work order is stored in PDF format in a designated folder, forming a set of work order documents to be parsed. After the program starts the GUI interface, it performs a one-time batch PDF analysis and processing, as follows: Text extraction and standardization cleaning: Traverse all PDF files in the specified folder and use the pdfplumber tool to extract the original text content of each work order page by page; perform standardization cleaning on the extracted original text, including converting it to lowercase characters, deleting all whitespace characters (spaces, tabs, line breaks), deleting Chinese and English parentheses and the content inside them, deleting all kinds of punctuation marks, and retaining only Chinese characters, letters and numbers to eliminate the interference of PDF format noise on the matching results.

[0045] Keyword matching and frequency statistics: After performing the same standardized cleaning process on the names of each screen location in the location database, keyword matching is performed on the cleaned text of each work order. A statistical rule of "one or more occurrences of the same screen location name within a single work order are counted as one occurrence" is adopted to avoid duplicate counting caused by multiple mentions of the same location in the same work order. The statistical results of all work orders are accumulated to obtain the frequency of work orders appearing in each secondary screen cabinet across the entire site.

[0046] Generate a set and complete visual labeling: Summarize the display cabinets that appear more than or equal to 1 time to generate an authorized work display cabinet set. As a preferred implementation, based on the statistically obtained frequency data, apply four-level color coding to the indicator lights in the GUI interface: 0 occurrences are labeled gray, representing a non-working location and the highest risk level; 1 occurrence is labeled blue, representing a single working location and normal operation; 2 occurrences are labeled yellow, representing two work permit overlapping locations requiring close monitoring; 3 or more occurrences are labeled red, representing multiple overlapping work locations requiring high monitoring. Each indicator light is simultaneously labeled with its corresponding frequency value, allowing maintenance personnel to intuitively grasp the overall site operation distribution and risk level.

[0047] Step S3 is used to collect the door opening and closing status data of each secondary cabinet in the station in real time, so as to perceive the actual physical state of the cabinet.

[0048] As a specific implementation of this embodiment, the opening and closing status of cabinet doors is collected by contact-type micro-motion limit switches deployed in each secondary cabinet. The hardware deployment scheme is as follows: each secondary cabinet is configured with limit switches according to the door structure. Cabinets with a single front door panel have one limit switch installed at the front door, and cabinets with double rear doors have one limit switch installed at each of the two rear door panels. All limit switches in the same cabinet are connected in parallel to form an "OR logic" output, that is, a high-level signal (DI=1) is output when any cabinet door is open, and a low-level signal (DI=0) is output when all cabinet doors are closed. The output signals of each limit switch are collected to the cabinet terminal block through RVVP shielded twisted pair cable and centrally connected to the corresponding channel of the USB digital input module. The digital input module is connected to the monitoring terminal through the USB interface and uses the Modbus RTU protocol for data interaction. The system is powered by a 24V DC power supply, and a 0.1μF capacitor is connected in parallel at the limit switch nodes to eliminate interference signals caused by contact bounce.

[0049] At the software level, after GUI initialization, two operations are performed in parallel: first, the DI acquisition module is initialized, establishing a communication connection between the monitoring terminal and the USB digital input module, and completing channel verification and parameter configuration; second, an independent background monitoring sub-thread is started, specifically responsible for cyclical status acquisition. For example, the sub-thread polls every 100 milliseconds, repeatedly calling the `read_di_status(seq_num)` function to read the DI status (0 or 1) of all channels, writing the acquired open / closed status data of each cabinet into a thread-safe queue (`queue.Queue`) and passing it to the main thread. This queue enables thread-safe data interaction between the sub-thread and the GUI main thread, avoiding mutual blocking between interface rendering and hardware acquisition, ensuring both real-time status monitoring and preventing interface lag.

[0050] Step S4 is used for consistency verification and security alerts to accurately identify unauthorized door opening behavior and trigger alerts.

[0051] Specifically, the GUI main thread continuously retrieves the latest cabinet status data from the thread-safe queue, performs bidirectional consistency verification between the real-time door opening and closing status of each secondary cabinet and the authorized working cabinet set, and executes the following judgments: If a cabinet's DI status is 1 (cabinet door is open), and the cabinet does not belong to the authorized work cabinet set (work ticket occurrence count is 0), it is determined that the cabinet door was mistakenly opened outside of a work location, triggering a safety warning. Otherwise, it is determined to be in a normal state, no alarm is triggered, and the interface remains displayed normally.

[0052] As a preferred implementation, the early warning system employs a dual visual and auditory linkage mechanism: the visual warning involves the corresponding indicator light turning red and flashing, along with a pop-up warning dialog box displaying the message "Warning: The door of the XX cabinet in an unauthorized location has been opened!"; the auditory warning involves a buzzer continuously emitting a warning sound. The system is equipped with an anti-shake and anti-repetition mechanism, ensuring that only one alarm is triggered while the same cabinet door remains open, preventing repeated alarms from interfering with on-site operations; the alarm status persists until the corresponding cabinet door is closed, at which point it automatically deactivates.

[0053] After the system starts, it continuously executes the status acquisition, verification and judgment and interface update process until the user closes the program, so as to realize real-time safety control of the entire process of substation secondary cabinet operation.

[0054] Compared with existing technologies, this invention has the following significant advantages: By automatically parsing work order documents and using a robust location frequency statistics algorithm, this invention can automatically identify overlapping work locations corresponding to multiple work orders and visually label them with hierarchical color coding, effectively solving the problems of difficult work scope identification and on-site management under multi-shift parallel operations; by combining work order authorization scope identification with real-time acquisition of cabinet door opening and closing status to construct a two-dimensional consistency verification mechanism, it can monitor the status of all station protection cabinet doors in real time around the clock. When a cabinet door in a non-working location is opened, it can trigger an audible and visual alarm with precise cabinet location prompts within 1 second, facilitating rapid response by maintenance personnel and preventing misoperation before it occurs, thus reducing the safety risk of equipment tripping due to incorrect intervals; the system retains complete alarm records, providing data support for post-event safety analysis; and it does not require changing the existing work habits of on-site personnel, achieving seamless intelligent safety monitoring, promoting the upgrade of substation secondary operation safety management from manual control to technical prevention and control, and significantly improving the inherent safety level of on-site operations.

[0055] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A safety management and control system for the operation of secondary switchgear in a substation, characterized in that, include: The hardware layer is used to collect data on the opening and closing status of the cabinet doors of each secondary cabinet in the station. The data layer is used to store the location database of pre-configured secondary cabinets and the electronic documents of work orders in the execution state. The location database contains the unique identifier of each secondary cabinet in the station and the corresponding cabinet position name. The business logic layer is used to extract and match the text of the electronic work order document to generate an authorized work cabinet set; it is also used to perform consistency verification between the cabinet door opening and closing status data and the authorized work cabinet set, and generate an early warning signal when it is detected that a secondary cabinet with its door open does not belong to the authorized work cabinet set. The display layer is used to receive the warning signal and output a safety warning prompt.

2. The system according to claim 1, characterized in that, The hardware layer includes several contact-type micro-motion limit switches, digital input modules, and a monitoring terminal. Each door of each secondary cabinet is equipped with one of the contact-type micro-motion limit switches. All contact-type micro-motion limit switches in the same cabinet are connected in parallel to form an OR logic output circuit, which outputs an open status signal when any door is opened. The contact-type micro-motion limit switches are connected to the digital input modules through shielded cables. The digital input modules are communicatively connected to the monitoring terminal to upload the door opening and closing status data to the business logic layer.

3. The system according to claim 1, characterized in that, The business logic layer generates an authorized work cabinet set in the following way: It performs standardized cleaning processing on the text extracted from the electronic work order document, including character format unification, deletion of blank characters, deletion of parentheses and their internal content, and deletion of punctuation marks; it performs keyword matching between the cleaned text and the screen names in the location database, and uses a statistical rule that the same screen name appearing once or more in a single work order is counted as one occurrence, to count the frequency of work orders for each screen location, and summarizes the screen cabinets with a frequency greater than or equal to 1 into an authorized work cabinet set.

4. The system according to claim 3, characterized in that, The display layer is a graphical user interface that uses grid-layout light-up signs to display the working status of all secondary screen cabinets in the station. The display layer uses a four-level color coding based on the frequency of the work tickets for each screen position: gray for 0 occurrences, blue for 1 occurrence, yellow for 2 occurrences, and red for 3 or more occurrences. Each light-up sign is simultaneously marked with the corresponding frequency value.

5. A method for safety management and control of secondary switchgear operation in substations, characterized in that, The method is applied to the substation secondary switchgear operation safety management system as described in any one of claims 1-4, including: Step S1: Obtain the pre-configured location database of substation secondary switch cabinets, wherein the location database contains the unique identifier of each secondary switch cabinet in the substation and the corresponding switch position name; Step S2: Extract text from at least one electronic work order document in execution state, match and identify the extracted text based on the secondary cabinet location database, determine the work cabinets covered by each work order, and generate an authorized work cabinet set. Step S3: Obtain real-time data on the opening and closing status of the cabinet doors of each secondary cabinet within the station; Step S4: Perform a consistency check between the real-time door opening and closing status data of each secondary cabinet and the authorized work cabinet set. When it is detected that a secondary cabinet with its door open does not belong to the authorized work cabinet set, a safety warning is triggered.

6. The method according to claim 5, characterized in that, Step S2 specifically includes: The extracted work order text is subjected to standardized cleaning processing, which includes converting it to lowercase characters, deleting whitespace characters, deleting Chinese and English parentheses and their internal content, deleting punctuation marks, and retaining only Chinese characters, letters and numbers. After performing the same standardized cleaning process on the screen names in the location database, keyword matching is performed on the cleaned text of each work order. The statistical rule is adopted that if the same screen position name appears once or more in a single work order, it is counted as one time. The frequency of each secondary screen cabinet's work order is accumulated, and the screen cabinets with a frequency greater than or equal to 1 are summarized to generate an authorized work screen cabinet set.

7. The method according to claim 6, characterized in that, Step S2 further includes: Based on the frequency of work orders for each secondary display cabinet, the illuminated signs in the graphical user interface are displayed with four levels of color coding: gray for 0 occurrences, blue for 1 occurrence, yellow for 2 occurrences, and red for 3 or more occurrences. Each illuminated sign is simultaneously marked with the corresponding frequency value.

8. The method according to claim 5, characterized in that, Step S3 specifically includes: The cabinet door opening and closing status signals are collected by parallel contact micro-motion limit switches installed on each cabinet door, and then uploaded to the monitoring terminal after being converted by the digital input module. An independent sub-thread is used to collect the door opening and closing status data of all secondary cabinets in a preset polling cycle. The collected data is then passed to the main thread for consistency verification logic through a thread-safe queue.

9. The method according to claim 5, characterized in that, In step S4, the safety warning is triggered by a dual visual and auditory linkage mechanism: the visual warning includes the red flashing of the corresponding screen position's light sign and the pop-up warning prompt, and the auditory warning is the continuous sounding of a buzzer; the alarm action is triggered only once during the continuous opening of the cabinet door of the same screen, and the alarm status is deactivated after the cabinet door is closed.

10. The method according to claim 5, characterized in that, After obtaining the pre-configured location database of substation secondary switchgear in step S1, the method further includes: Load the location library and construct a mapping list of "serial number - screen location name"; Initialize the graphical user interface and generate the light sign display frame corresponding to each screen cabinet in a grid layout according to the sequence number in the location library.

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