A method and system for thermal radiation slope tracking for low voltage switchgear

Abstract

The application provides a heat radiation gradient tracking method and system for a low-voltage complete switch device. The heat radiation gradient tracking method first randomly determines a detection area of a heat radiation monitoring device on a backboard of a cabinet, and then controls movement of the heat radiation monitoring device according to a maximum positive gradient direction of heat radiation, so as to quickly find a position of a local area with the highest temperature, and provide basic data support for analysis of heat runaway, while ensuring monitoring efficiency of the entire backboard range. The heat radiation gradient tracking system uses a gap between a backboard and a cabinet body as a layout space of related devices, and uses the backboard as a heat radiation monitoring object, so that the corresponding heat radiation gradient tracking method can be realized at low cost, and the system has good practicability.

Description

Technical Field

[0001] This invention relates to the field of monitoring, specifically to a method and system for tracking the thermal radiation slope of low-voltage switchgear. Background Technology

[0002] Because low-voltage switchgear is operated remotely, it typically operates without human monitoring. The greatest risk in this mode is thermal runaway, which can easily lead to fire. There are many causes of thermal runaway, such as localized damage to individual equipment, localized deformation of conductors, and electrical control malfunctions. Some of these causes cannot be directly monitored via the cloud. Therefore, it is necessary to monitor the temperature at various points on the low-voltage switchgear to prevent fire risks caused by thermal runaway.

[0003] When it comes to unmanned temperature monitoring at multiple points, infrared thermal imagers are a relatively reliable monitoring method. However, on the one hand, due to space limitations, infrared thermal imagers cannot have sufficient line-of-sight distance to acquire the temperature of all points in the entire low-voltage switchgear. On the other hand, if multiple infrared thermal imagers are used to monitor the temperature of individual devices separately, the deployment cost is uncontrollable and not feasible, depending on the structure and scale of the low-voltage switchgear.

[0004] Therefore, a combination of small-scale thermal radiation monitoring and mobile monitoring can be used to monitor the temperature of the entire low-voltage switchgear assembly. Similarly, due to space constraints, cost constraints, and considerations of the overall system stability, the thermal radiation monitoring equipment and related drive equipment are small in size, and the movement speed of the thermal radiation monitoring equipment cannot be too fast. If a traversal scanning monitoring method is used, the monitoring cycle speed is slow and the monitoring lag is strong. Therefore, random points or specific loop routes are generally used for monitoring. How to design a more reasonable monitoring route is one of the technical problems that urgently needs to be solved. Summary of the Invention

[0005] This invention provides a method and system for tracking thermal radiation slope in low-voltage switchgear assemblies. The method first randomly determines the detection area of ​​the thermal radiation monitoring device on the back panel of the cabinet. Then, it controls the movement of the monitoring device according to the direction of the maximum positive slope of thermal radiation to quickly locate the location of the highest temperature point in a local area, providing basic data support for thermal runaway analysis while ensuring monitoring efficiency across the entire back panel. Based on the existing structure of low-voltage switchgear assemblies, this thermal radiation slope tracking system utilizes the gap between the back panel and the cabinet as the arrangement space for related equipment and uses the back panel as the thermal radiation monitoring object. This enables the implementation of the corresponding thermal radiation slope tracking method at low cost and has good practicality.

[0006] Accordingly, this invention provides a method for tracking the thermal radiation slope of low-voltage switchgear assemblies, which divides the backplane of the low-voltage switchgear assemblies into sections based on the thermal radiation monitoring accuracy of the thermal radiation monitoring equipment. cells The thermal radiation monitoring equipment has The thermal radiation monitoring area, among which , , , ;

[0007] This includes the initial positioning process and the slope tracking process;

[0008] The initial positioning process includes:

[0009] S201: The central control center selects a target cell in the back panel area according to preset rules. The thermal radiation monitoring device is then driven to move to the target cell via a driving device. This represents the cumulative number of the target cell;

[0010] The slope tracking process includes:

[0011] S301: The central control center receives real-time feedback from the drive equipment regarding the location of the thermal radiation monitoring device. , , , Real-time;

[0012] S302: Central control center determines whether it exists. , For historical times within the same slope tracking process, if they exist Proceed to step S201;

[0013] S303: The central control center receives real-time thermal radiation maps fed back by the thermal radiation monitoring equipment. , For the thermal radiation monitoring equipment in The four thermal radiation values ​​are obtained by constantly monitoring the four cells in the thermal radiation monitoring area;

[0014] S304: The central control center determines the aforementioned thermal radiation map. Are all thermal radiation values ​​in the graph equal? ​​If so, the thermal radiation graph... If all thermal radiation values ​​are equal, proceed to step S201.

[0015] S305: The central control center locates the direction of maximum positive slope of thermal radiation based on the thermal radiation map, and drives the thermal radiation monitoring device to move one or two unit distances in the direction of maximum positive slope of thermal radiation via the drive device;

[0016] S306: Repeat steps S301 to S305.

[0017] In an optional implementation, the central control center selects a target cell in the back panel area according to preset rules, including:

[0018] Constructing cell evaluation metrics ;

[0019] Select the cell with the highest value of the evaluation index from all cells as the target cell. ;

[0020] in, ;

[0021] For cells The total number of times a cell is selected as the target cell. For cells With the The distance between target cells As a preset value, , and It is a proportionality coefficient, and The larger, The larger.

[0022] In an optional implementation, the central control center locates the direction of maximum positive slope for thermal radiation based on the thermal radiation map, including:

[0023] The central control center traverses and calculates the aforementioned thermal radiation map. The relative difference between any two thermal radiation values ​​is used to select the two cells corresponding to the two thermal radiation values ​​with the largest absolute value of the relative difference as the first calculation cell and the second calculation cell;

[0024] In the first and second calculation cells, the direction from the calculation cell with the smaller thermal radiation value to the calculation cell with the larger thermal radiation value is taken as the direction of the maximum positive slope.

[0025] An optional implementation also includes an initial modeling process;

[0026] The initial modeling process includes:

[0027] S101: The central control center constructs a plan layout diagram of the low-voltage switchgear using the back panel as the projection direction. The plan layout diagram of the low-voltage switchgear includes several power devices, the arrangement position and arrangement posture of each power device.

[0028] S102: The central control center extracts the thermal radiation theoretical model diagram of each power equipment in the low-voltage switchgear plan layout diagram;

[0029] S103: The central control center overlays the thermal radiation theoretical model diagram of each power equipment according to the low-voltage switchgear layout diagram to form a first theoretical thermal radiation diagram. Each cell in the first theoretical thermal radiation diagram has a corresponding first theoretical thermal radiation value.

[0030] S104: Measure the room temperature of the low-voltage switchgear assembly and measure the measured thermal radiation values ​​of some cells in the back panel, and establish the correspondence between the room temperature and the measured thermal radiation values ​​of the cells.

[0031] S105: Determine the measured thermal radiation values ​​of the partial cells based on the real-time room temperature, and adjust the first theoretical thermal radiation map with the measured thermal radiation values ​​of the partial cells to obtain the second theoretical thermal radiation map.

[0032] In an optional implementation, in step S104, the room temperature has a preset upper limit value.

[0033] An optional implementation method is to adjust the first theoretical thermal radiation map with the measured thermal radiation values ​​of the partial cells to obtain the second theoretical thermal radiation map, which is achieved by adjusting the spline surface control points or solving the biharmonic equation.

[0034] Optional implementation methods also include an evaluation process;

[0035] In step S302 or step S304, before jumping to step S201, the evaluation process is triggered, and the evaluation process includes:

[0036] S401: Thermal radiation map acquired in real time by the central control center The cell with the highest thermal radiation value is extracted as the evaluation target cell;

[0037] S402: The evaluation result is obtained by comparing the thermal radiation value of the target cell with the second theoretical thermal radiation value of the corresponding cell in the second theoretical thermal radiation map.

[0038] Optional implementation methods also include an early warning process;

[0039] The early warning process includes:

[0040] S501: Issue an alert based on the specific location of the evaluation target cell on the background panel.

[0041] Accordingly, the present invention also provides a thermal radiation slope tracking system for low-voltage switchgear assemblies, for implementing the aforementioned thermal radiation slope tracking method for low-voltage switchgear assemblies.

[0042] The thermal radiation slope tracking system for low-voltage switchgear includes a central control center, thermal radiation monitoring equipment for monitoring thermal radiation, and a drive device for controlling the movement of the thermal radiation monitoring equipment in a two-dimensional direction.

[0043] In an optional implementation, the driving device is a cross slide structure.

[0044] In summary, this invention provides a method and system for tracking thermal radiation slope in low-voltage switchgear assemblies. The method first randomly determines the detection area of ​​the thermal radiation monitoring device on the back panel of the cabinet. Then, it controls the movement of the thermal radiation monitoring device according to the direction of the maximum positive slope of thermal radiation to quickly locate the location of the highest temperature point in a local area, providing basic data support for thermal runaway analysis while ensuring monitoring efficiency across the entire back panel area. Based on the existing structure of low-voltage switchgear assemblies, this thermal radiation slope tracking system utilizes the gap between the back panel and the cabinet as the arrangement space for related equipment and uses the back panel as the thermal radiation monitoring object. This enables the implementation of the corresponding thermal radiation slope tracking method at low cost and has good practicality. Attached Figure Description

[0045] Figure 1 This is a three-dimensional structural diagram of a low-voltage switchgear assembly.

[0046] Figure 2 This is a schematic diagram of the data connection structure of a system for low-voltage switchgear according to an embodiment of the present invention.

[0047] Figure 3 This is a front view structural diagram of a system for low-voltage switchgear according to an embodiment of the present invention.

[0048] Figure 4 This is a schematic diagram of the rear view of a system for a low-voltage switchgear assembly according to an embodiment of the present invention.

[0049] Figure 5 This is a flowchart of the thermal radiation slope tracking method according to an embodiment of the present invention.

[0050] Figure 6 This is a schematic diagram of the thermal radiation theoretical model of the power equipment corresponding to the embodiment of the present invention. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] To facilitate understanding, the embodiments of the present invention first describe the relevant physical carriers of the low-voltage switchgear involved.

[0053] Figure 1 This is a three-dimensional structural diagram of a low-voltage switchgear assembly. The cabinet door is hidden in this diagram, and the shaded area is shown in cross-section. Basically, the low-voltage switchgear assembly includes a cabinet 2, a back panel 1, a busbar system 3, and a series of electrical devices 4 attached to the busbar system. Referring to the attached diagram, the electrical devices are generally installed on the front of the back panel, which serves as the mounting carrier. Furthermore, due to its large area, the back panel generally also has an auxiliary heat dissipation function. A gap is left between the back panel 1 and the cabinet 2. This gap is used to ensure insulation between the back panel, the busbar system, the electrical devices, and the cabinet, preventing the risk of electric shock. In this embodiment of the invention, based on feasibility considerations, the necessary thermal radiation monitoring equipment and drive equipment are installed in the gap between the back panel 1 and the cabinet 2. Details regarding the thermal radiation monitoring equipment and drive equipment will be explained later.

[0054] Figure 2 This is a schematic diagram of the data connection structure of a system for low-voltage switchgear according to an embodiment of the present invention, wherein the dashed lines represent data transmission relationships and the solid lines represent physical connection relationships.

[0055] From the perspective of data transmission structure logic, the system for low-voltage switchgear in this embodiment of the invention includes a central control center, a thermal radiation monitoring device for monitoring thermal radiation, and a drive device for controlling the movement of the thermal radiation monitoring device in a two-dimensional direction. According to the data transmission order, the thermal radiation monitoring device sends thermal radiation monitoring data to the central control center, which controls the action of the drive device. The action of the drive device affects the physical spatial position of the thermal radiation monitoring device.

[0056] Structurally, the system for low-voltage switchgear according to embodiments of the present invention includes a central control center, a thermal radiation monitoring device, and a drive device, wherein the central control center and the thermal radiation monitoring device can be considered as independent structural components, while the drive device has an optional physical structure.

[0057] According to functional requirements, the drive device needs to drive the thermal radiation monitoring device to move in one- or two-dimensional space so that the thermal radiation monitoring device can perform multi-point thermal radiation monitoring of the low-voltage switchgear. Specifically, considering the structural characteristics of the low-voltage switchgear, the thermal radiation monitoring device in this embodiment of the invention is installed on the back side of the back panel of the low-voltage switchgear, located between the cabinet and the back panel of the low-voltage switchgear.

[0058] Considering the installation space, the drive device can adopt a trolley structure or a cross slide structure. Based on the consideration of motion stability and positioning accuracy, the cross slide structure is preferred.

[0059] Figure 3 This is a front view structural diagram of a system for low-voltage switchgear according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the rear view of a system for a low-voltage switchgear assembly according to an embodiment of the present invention, wherein... Figure 4 The back of the cabinet is concealed to reveal the thermal radiation monitoring equipment and drive equipment located in the gap.

[0060] Specifically, when the drive device adopts a cross slide structure, the drive device includes a Y-axis guide rail 7, a Y-axis drive module 5, an X-axis guide rail 6, and an X-axis drive module. Specifically, the Y-axis guide rail is fixed along the Y direction to the side or back of the cabinet, and the X-axis guide rail is arranged along the X direction. The Y-axis drive module controls the overall movement of the X-axis guide rail along the Y direction by driving one end of the X-axis guide rail. For force balance, both ends of the X-axis guide rail are slidably engaged with the two Y-axis guide rails respectively. A sliding platform 9 is provided on the X-axis guide rail, and the sliding platform 9 is slidably engaged with the X-axis guide rail 6. The X-axis drive module and the thermal radiation monitoring device 8 are both integrated on the sliding platform 9. Under the drive of the X-axis drive module, the sliding platform moves along the X-axis guide rail.

[0061] Specifically, in Figure 4 The schematic diagram shows a set of drive equipment and thermal radiation monitoring equipment. Theoretically, a single X-axis guide rail can cover the entire back panel area across the entire cabinet. In practice, considering the compatibility of equipment production and monitoring efficiency, the width of the X-axis guide rail can be designed according to the width of a single cabinet unit, and multiple sets of drive equipment and thermal radiation monitoring equipment can be combined according to the size of the entire cabinet to achieve coverage monitoring of the back panel area.

[0062] Figure 5 This is a flowchart of the thermal radiation slope tracking method according to an embodiment of the present invention.

[0063] Based on the aforementioned related structures, embodiments of the present invention provide a method for tracking the thermal radiation gradient of low-voltage switchgear assemblies, comprising:

[0064] S10: Initial modeling process;

[0065] This process is mainly used to establish a temperature model of the backplane plane under stable operating conditions within the central control center, thereby providing a reference for the thermal radiation data obtained through monitoring.

[0066] S11: Initial positioning process;

[0067] This process is mainly used to scientifically determine the starting point of motion for thermal radiation monitoring equipment.

[0068] S12: Slope tracking process;

[0069] The process mainly involves controlling the thermal radiation monitoring equipment to move along the thermal radiation slope of the back panel, thereby reaching the highest temperature point in the area.

[0070] S13: Evaluation Process;

[0071] The information obtained by the thermal radiation monitoring equipment after reaching the highest temperature point in a local area is evaluated.

[0072] S14: Early Warning Procedure;

[0073] The evaluation results will determine whether an early warning is needed, and the specific type of early warning to be issued.

[0074] Steps S10 to S14 will be explained in detail below.

[0075] The initial modeling process includes:

[0076] S101: The central control center constructs a floor plan of the low-voltage switchgear assembly;

[0077] Basically, the low-voltage switchgear layout diagram includes several electrical devices, as well as the arrangement and location of each electrical device. Specifically, since the object of thermal radiation monitoring is the back panel of the low-voltage switchgear, the layout diagram of the low-voltage switchgear is drawn with the back panel plane as the projection direction. It mainly includes components that generate heat, such as busbars in the bus system, electrical equipment, and electrical control equipment.

[0078] In this embodiment of the invention, the plan layout diagram of the low-voltage switchgear can be referred to. Figure 3 Schematic structure.

[0079] S102: Extract the theoretical model diagram of thermal radiation for each power device;

[0080] Specifically, the way the power equipment is fixed on the back panel is relatively fixed. Correspondingly, when the power equipment is running independently, the diffusion pattern of its heat radiation on the back panel is similar (except for a slight difference when it is located at the edge of the back panel). Therefore, a corresponding theoretical model diagram of heat radiation can be constructed for each power equipment through independent testing.

[0081] It should be noted that, in order to unify the resolution of the thermal radiation theoretical model diagram and the thermal radiation monitoring accuracy of the thermal radiation monitoring equipment, it is necessary to divide the backplane into cells. Specifically, based on the thermal radiation monitoring accuracy of the thermal radiation monitoring equipment, the backplane area of ​​the low-voltage switchgear is divided into... cells The thermal radiation monitoring equipment has The thermal radiation monitoring area, among which , , , .

[0082] Specifically, thermal radiation monitoring equipment has the simplest... The thermal radiation monitoring area can reduce the procurement cost of thermal radiation monitoring equipment and also help to accelerate the tracking and calculation of thermal radiation slope.

[0083] Figure 6 This is a schematic diagram of the thermal radiation theoretical model of a power device corresponding to an embodiment of the present invention.

[0084] Specifically, regarding the establishment of the radiation theoretical model diagram for electrical equipment, the experimental method involves independently fixing the electrical equipment to the central area of ​​the backplate according to its corresponding fixing method under an ambient temperature of 25°C, and then energizing it according to its operating mode. Considering the issue of load fluctuation, in the experimental environment, the electrical equipment is generally operated in its maximum power consumption mode. For example, if the electrical equipment requires an external load, a load cell can be used to simulate the load and force the electrical equipment to operate in its maximum power consumption mode. After the operating state of the electrical equipment stabilizes, its corresponding thermal radiation mode becomes relatively fixed. At this point, the thermal radiation state of the corresponding area can be monitored on the back of the backplate to obtain the corresponding thermal radiation theoretical model diagram of the electrical equipment. Specifically, if the electrical equipment is numbered as... The thermal radiation theoretical model diagram of power equipment is coded as follows: ,in, For setting coordinates of power equipment, Indicates the distance from the power equipment Set the coordinate vector distance to The thermal radiation value of the cell, .

[0085] S103: The central control center superimposes the thermal radiation theoretical model diagrams of each power equipment according to the low-voltage switchgear layout diagram to form the first theoretical thermal radiation diagram;

[0086] Based on the layout location of the power equipment, superimposed with the thermal radiation theoretical model diagram, the corresponding... This results in the formation of the first theoretical thermal radiation diagram of low-voltage switchgear.

[0087] S104: Measure the room temperature of the low-voltage switchgear assembly and measure the measured thermal radiation values ​​of some cells in the back panel, and establish the correspondence between the room temperature and the measured thermal radiation values ​​of the cells.

[0088] This step primarily involves determining the correlation between room temperature and the thermal radiation values ​​of certain cells. It should be noted that room temperature is set within a range; abnormal room temperatures obviously cannot be used as the calibration standard. Specifically, the calibration range for room temperature is determined based on the environment in which the low-voltage switchgear is located, and its maximum value is generally limited. When the actual room temperature exceeds the defined maximum room temperature, only the maximum room temperature is used as a reference.

[0089] S105: Determine the measured thermal radiation values ​​of the partial cells based on the real-time room temperature, and adjust the first theoretical thermal radiation map with the measured thermal radiation values ​​of the partial cells to obtain the second theoretical thermal radiation map;

[0090] According to functional requirements, the first theoretical thermal radiation map is mainly used to obtain the thermal radiation impact of multiple power devices on the back panel when they are working. Its main purpose is to show the thermal radiation distribution pattern of the back panel under the combined influence of multiple thermal radiation sources. Based on the thermal radiation change pattern of the first theoretical thermal radiation map, the theoretical real-time thermal radiation value of all cells is obtained by substituting the measured thermal radiation values ​​of some cells.

[0091] Specifically, the basis for deriving the second theoretical thermal radiation map from the first theoretical thermal radiation map is to ensure the continuity of the slope of the thermal radiation value. From a mathematical point of view, this means that the continuity of the first derivative (C¹ continuity) needs to be ensured. Since there may be continuous regions with the same thermal radiation value in the first theoretical thermal radiation map (these continuous regions are not part of the surface), these continuous regions are not included in the calculation when judging the continuity of the first derivative.

[0092] Specifically, the coordinates of the backplate cells in the first theoretical thermal radiation map are considered as X and Y parameters, and the thermal radiation value is considered as the Z parameter. Accordingly, the first theoretical thermal radiation map can be understood as a surface in three-dimensional space. The surface represented by the first theoretical thermal radiation map is adjusted based on the measured thermal radiation values ​​of some cells. The techniques that can be used include adjusting the control points of spline surfaces (such as B-splines or NURBS) and solving the biharmonic equation. From the perspective of computer implementation and visualization, the spline surface control point adjustment technique is preferred, as it can be better applied to the display of the client UI.

[0093] The initial positioning process includes:

[0094] S201: The central control center selects a target cell in the back panel area according to preset rules. The thermal radiation monitoring device is then driven to move to the target cell via a driving device. This represents the cumulative number of the target cell;

[0095] Since the purpose of thermal radiation tracking in this embodiment of the invention is to track the highest temperature point in a local area, the initial position of the thermal radiation monitoring device can be arbitrary and random. However, considering the monitoring coverage and timeliness of the entire backplane, further design of the initial positioning position of the thermal radiation monitoring device is required.

[0096] Simply put, since the purpose of thermal radiation tracking is to track the highest temperature point in a local area, the initial modeling process can first divide the backplane into regions. From the second theoretical thermal radiation map, with the highest thermal radiation point or region as the center, the entire backplane can be divided into several "mountain"-shaped regions according to the angle of descent of the thermal radiation slope. Then, initial positioning points can be selected by traversing or randomly selecting different "mountain"-shaped regions. However, this implementation method is prone to missed detection when unpredictable risk heating points appear in low-voltage switchgear, resulting in monitoring lag.

[0097] Therefore, in this embodiment of the invention, the central control center selecting a target cell in the back panel area according to preset rules includes:

[0098] Constructing cell evaluation metrics ;

[0099] Select the cell with the highest value of the evaluation index from all cells as the target cell. ;

[0100] in, ;

[0101] For cells The total number of times a cell is selected as the target cell. For cells With the The distance between target cells As a preset value, , and It is a proportionality coefficient, and The larger, The larger.

[0102] Specifically, in cell evaluation metrics In the middle, indicators This metric is used to evaluate the number of times a corresponding cell is selected. The more times it is selected, the smaller the value of this metric. The reason for adding one to the denominator is to prevent zero values ​​from appearing. This indicates that the corresponding cell is related to the previous cell. The distance between the selected target cells is considered, with greater distance resulting in a higher score. The proportional coefficient is used to amplify differences over time, meaning that the distance between the later selected target cell and its corresponding cell has a greater impact.

[0103] Evaluation metrics by cell In the process of establishing the selection process, each cell has its own score value during the selection phase. Generally, the cell with the highest score value is selected as the target cell for this process. .

[0104] The slope tracking process includes:

[0105] S301: The central control center receives real-time feedback from the drive equipment regarding the location of the thermal radiation monitoring device. , , , Real-time;

[0106] S302: Central control center determines whether it exists. , For historical times within the same slope tracking process, if they exist Proceed to step S201;

[0107] S303: The central control center receives real-time thermal radiation maps fed back by the thermal radiation monitoring equipment. , For the thermal radiation monitoring equipment in The four thermal radiation values ​​are obtained by constantly monitoring the four cells in the thermal radiation monitoring area;

[0108] S304: The central control center determines the aforementioned thermal radiation map. Are all thermal radiation values ​​in the graph equal? ​​If so, the thermal radiation graph... If all thermal radiation values ​​are equal, proceed to step S201.

[0109] S305: The central control center locates the direction of maximum positive slope of thermal radiation based on the thermal radiation map, and drives the thermal radiation monitoring device to move one or two unit distances in the direction of maximum positive slope of thermal radiation via the drive device;

[0110] S306: Repeat steps S301 to S305.

[0111] Specifically, in the slope tracking process, the direction of the maximum positive slope of thermal radiation is obtained from the thermal radiation map acquired by the thermal radiation monitoring equipment, and this is used as a guide to control the movement position of the thermal radiation monitoring equipment at the next moment. The judgment in steps S302 and S304 is to determine whether the thermal radiation monitoring equipment has reached the position of maximum thermal radiation value in the local area.

[0112] Specifically, the central control center traverses and calculates the thermal radiation map. The relative difference between any two thermal radiation values ​​is used to select the two cells corresponding to the two thermal radiation values ​​with the largest absolute value of the relative difference as the first calculation cell and the second calculation cell; in the first calculation cell and the second calculation cell, the direction from the calculation cell with the smaller thermal radiation value to the calculation cell with the larger thermal radiation value is taken as the direction of the maximum positive slope.

[0113] Furthermore, the unit distance setting is directional. For example, if the direction of the maximum positive slope is X or Y, the unit distance is moving one cell in the X or Y direction; if the direction of the maximum positive slope is diagonal, the unit distance is moving one cell in the corresponding diagonal direction (numerically, moving one cell diagonally is equivalent to moving one cell in the X or Y direction). Specifically, by driving the thermal radiation monitoring device to move one unit distance in the direction of the maximum positive slope of thermal radiation, the operating trajectory of the appropriate thermal radiation monitoring device can be determined with higher accuracy. By driving the thermal radiation monitoring device to move two unit distances in the direction of the maximum positive slope of thermal radiation, the highest point / area of ​​thermal radiation in the local area can be reached more quickly.

[0114] The evaluation process includes

[0115] S401: Thermal radiation map acquired in real time by the central control center The cell with the highest thermal radiation value is extracted as the evaluation target cell;

[0116] Specifically, the evaluation process is mainly triggered by the jump execution conditions of steps S302 and S304. When the execution of step S201 is triggered based on steps S302 and S304, the latest acquired thermal radiation map is temporarily stored. In thermal radiation diagram The cell with the highest thermal radiation value is selected as the evaluation target cell.

[0117] S402: The evaluation result is obtained by comparing the thermal radiation value of the target cell with the second theoretical thermal radiation value of the corresponding cell in the second theoretical thermal radiation map.

[0118] Generally, the difference in thermal radiation values ​​can be used as a comparative evaluation index. However, if the difference between the thermal radiation value of the evaluation target cell and the second theoretical thermal radiation value of the corresponding cell in the second theoretical thermal radiation diagram is within a preset range, it indicates that the thermal radiation value of the evaluation target cell is normal. If the difference between the thermal radiation value of the evaluation target cell and the second theoretical thermal radiation value of the corresponding cell in the second theoretical thermal radiation diagram exceeds the preset range, it indicates that the thermal radiation value of the evaluation target cell is abnormal.

[0119] When the thermal radiation value of the target cell is abnormal, the alert process will be executed.

[0120] The early warning process includes: S501: issuing an early warning based on the specific location of the evaluation target cell on the back panel.

[0121] As explained above, the second theoretical thermal radiation map is divided into several "mountain"-shaped regions, with the highest peak of each region being the highest temperature point. If the evaluation target cell appears at the highest peak of a "mountain"-shaped region associated with a single power device, it indicates that the thermal runaway is highly likely occurring on the corresponding power device. In this case, the potential hazard can be eliminated by inspecting the corresponding power device. If the "mountain"-shaped region where the evaluation target cell is located is actually the superposition of the thermal radiation theoretical model diagrams of two or more power devices, it may be necessary to simultaneously eliminate the associated power devices. If the location of the evaluation target cell is unrelated to the highest peak of any of the "mountain"-shaped regions in the second theoretical thermal radiation map, it may be a risk of thermal runaway caused by unknown reasons, requiring immediate on-site troubleshooting to ensure the operational safety of the complete set of low-voltage equipment.

[0122] In summary, this invention provides a method and system for tracking thermal radiation slope in low-voltage switchgear assemblies. The method first randomly determines the detection area of ​​the thermal radiation monitoring device on the back panel of the cabinet. Then, it controls the movement of the thermal radiation monitoring device according to the direction of the maximum positive slope of thermal radiation to quickly locate the location of the highest temperature point in a local area, providing basic data support for thermal runaway analysis while ensuring monitoring efficiency across the entire back panel area. Based on the existing structure of low-voltage switchgear assemblies, this thermal radiation slope tracking system utilizes the gap between the back panel and the cabinet as the arrangement space for related equipment and uses the back panel as the thermal radiation monitoring object. This enables the implementation of the corresponding thermal radiation slope tracking method at low cost and has good practicality.

[0123] The above provides a detailed description of a thermal radiation slope tracking method and system for low-voltage switchgear provided by embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for tracking the thermal radiation slope of low-voltage switchgear assemblies, wherein the backplane of the low-voltage switchgear assemblies is divided into sections based on the thermal radiation monitoring accuracy of the thermal radiation monitoring equipment. cells The thermal radiation monitoring equipment has The thermal radiation monitoring area, among which ， ， ， ； Its features include an initial positioning process and a slope tracking process; The initial positioning process includes: S201: The central control center selects a target cell in the back panel area according to preset rules. The thermal radiation monitoring device is then driven to move to the target cell via a driving device. This represents the cumulative number of the target cell; The slope tracking process includes: S301: The central control center receives real-time feedback from the drive equipment regarding the location of the thermal radiation monitoring device. , , , Real-time; S302: Central control center determines whether it exists. , For historical time periods within the same slope tracking process, if they exist Proceed to step S201; S303: The central control center receives real-time thermal radiation maps fed back by the thermal radiation monitoring equipment. , For the thermal radiation monitoring equipment in The four thermal radiation values ​​are obtained by constantly monitoring the four cells in the thermal radiation monitoring area; S304: The central control center determines the aforementioned thermal radiation map. Are all thermal radiation values ​​in the graph equal? ​​If so, the thermal radiation graph... If all thermal radiation values ​​are equal, proceed to step S201. S305: The central control center, based on the aforementioned thermal radiation map... Locate the direction of maximum positive slope for thermal radiation, and drive the thermal radiation monitoring device to move one or two unit distances in that direction. S306: Repeat steps S301 to S305.

2. The method for tracking the thermal radiation slope of low-voltage switchgear as described in claim 1, characterized in that, The central control center selects a target cell in the back panel area according to preset rules, including: Constructing cell evaluation metrics ; Select the cell with the highest value of the evaluation index from all cells as the target cell. ; in, ; For cells The total number of times a cell is selected as the target cell. For cells With the The distance between target cells As a preset value, , and It is a proportionality coefficient, and The larger, The larger.

3. The method for tracking the thermal radiation slope of low-voltage switchgear as described in claim 1, characterized in that, The central control center, based on the thermal radiation map The direction for finding the maximum positive slope of thermal radiation includes: The central control center traverses and calculates the thermal radiation map. The relative difference between any two thermal radiation values ​​is calculated, and the two cells corresponding to the two thermal radiation values ​​with the largest absolute value of the relative difference are selected as the first calculation cell and the second calculation cell. In the first and second calculation cells, the direction from the calculation cell with the smaller thermal radiation value to the calculation cell with the larger thermal radiation value is taken as the direction of the maximum positive slope.

4. The method for tracking the thermal radiation slope of low-voltage switchgear as described in claim 1, characterized in that, It also includes the initial modeling process; The initial modeling process includes: S101: The central control center constructs a plan layout diagram of the low-voltage switchgear using the back panel as the projection direction. The plan layout diagram of the low-voltage switchgear includes several power devices, the arrangement position and arrangement posture of each power device. S102: The central control center extracts the thermal radiation theoretical model diagram of each power equipment in the low-voltage switchgear plan layout diagram; S103: The central control center overlays the thermal radiation theoretical model diagram of each power equipment according to the low-voltage switchgear layout diagram to form a first theoretical thermal radiation diagram. Each cell in the first theoretical thermal radiation diagram has a corresponding first theoretical thermal radiation value. S104: Measure the room temperature of the low-voltage switchgear assembly and measure the measured thermal radiation values ​​of some cells in the back panel, and establish the correspondence between the room temperature and the measured thermal radiation values ​​of the cells. S105: Determine the measured thermal radiation values ​​of the partial cells based on the real-time room temperature, and adjust the first theoretical thermal radiation map with the measured thermal radiation values ​​of the partial cells to obtain the second theoretical thermal radiation map.

5. The thermal radiation slope tracking method for low-voltage switchgear assemblies as described in claim 4, characterized in that, In step S104, the room temperature has a preset upper limit value.

6. The thermal radiation slope tracking method for low-voltage switchgear assemblies as described in claim 4, characterized in that, The first theoretical thermal radiation map is adjusted based on the measured thermal radiation values ​​of the aforementioned cells to obtain the second theoretical thermal radiation map, which is achieved by adjusting the spline surface control points or solving the biharmonic equation.

7. The thermal radiation slope tracking method for low-voltage switchgear assemblies as described in claim 4, characterized in that, It also includes the evaluation process; In step S302 or step S304, before jumping to step S201, the evaluation process is triggered, and the evaluation process includes: S401: Thermal radiation map acquired in real time by the central control center The cell with the highest thermal radiation value is extracted as the evaluation target cell; S402: The evaluation result is obtained by comparing the thermal radiation value of the target cell with the second theoretical thermal radiation value of the corresponding cell in the second theoretical thermal radiation map.

8. The method for tracking the thermal radiation slope of low-voltage switchgear as described in claim 7, characterized in that, It also includes the early warning process; The early warning process includes: S501: Issue an alert based on the specific location of the evaluation target cell on the background panel.

9. A thermal radiation slope tracking system for low-voltage switchgear assemblies, characterized in that, For implementing the thermal radiation slope tracking method for low-voltage switchgear assemblies as described in any one of claims 1 to 8; The thermal radiation slope tracking system for low-voltage switchgear includes a central control center, thermal radiation monitoring equipment for monitoring thermal radiation, and a drive device for controlling the movement of the thermal radiation monitoring equipment in a two-dimensional direction.

10. The thermal radiation slope tracking system for low-voltage switchgear as described in claim 9, characterized in that, The drive device is a cross slide structure.

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