Thermal radiation gradient tracking method and system for low-voltage switchgear assembly

Abstract

The invention provides a thermal radiation gradient tracking method and system for a low-voltage switchgear assembly, and the method comprises the steps: firstly, randomly determining a detection region of thermal radiation monitoring equipment on a backboard of a cabinet, and then controlling the movement of the thermal radiation monitoring equipment according to the maximum positive gradient direction of thermal radiation. The position of the highest temperature point of a local area is quickly found, basic data support is provided for thermal runaway analysis, and meanwhile the monitoring efficiency of the whole backboard range can be guaranteed. According to the thermal radiation gradient tracking system, on the basis of the structure of the existing low-voltage complete switch equipment, the gap between the back plate and the cabinet body is used as the arrangement space of related equipment, the back plate is used as a thermal radiation monitoring object, the corresponding thermal radiation gradient tracking method can be realized at low cost, and good practicability is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of monitoring, in particular to a heat radiation slope tracking method and system for low-voltage switchgear. BACKGROUND

[0002] Due to the use of remote control mode, the low-voltage switchgear generally adopts an unmanned monitoring mode in daily operation, and the biggest risk is thermal runaway, which is easy to cause a fire. There are many reasons for thermal runaway, such as local damage of independent equipment, local deformation of wires, abnormal electrical control, etc., and some of the reasons cannot be directly monitored by the cloud, so it is necessary to monitor the temperature of each point of the low-voltage switchgear to prevent the risk of fire caused by thermal runaway.

[0003] Involving multi-point temperature unmanned monitoring, using an infrared thermal imager is a more reliable monitoring means, but on the one hand, the size of the space is limited, and the infrared thermal imager cannot have enough sight distance to obtain the temperature of all points of the entire low-voltage switchgear, on the other hand, if a multi-point infrared thermal imager is used to monitor the temperature of independent equipment, according to the structure and scale of the low-voltage switchgear, the cost of control is uncontrollable, and it is not feasible to implement.

[0004] Therefore, a small range of heat radiation monitoring and mobile monitoring can be combined to monitor the temperature of the entire low-voltage switchgear; similarly, based on the limitation of space, the limitation of cost and the stability of the entire system, the heat radiation monitoring device and the related driving device are small in size, and the movement speed of the heat radiation monitoring device cannot be too fast. If a traversal scanning monitoring method is used, the monitoring cycle speed is slow and the monitoring lag is strong, so a random point or a specific cycle route is generally used for monitoring, and how to more reasonably design the monitoring route is one of the technical problems to be solved. SUMMARY

[0005] The present application provides a heat radiation slope tracking method and system for low-voltage switchgear, which first randomly determines the detection area of the heat radiation monitoring device on the backboard of the cabinet, and then controls the movement of the heat radiation monitoring device according to the maximum positive slope direction of the heat radiation to quickly find the position of the highest temperature point in the local area, providing basic data support for the analysis of thermal runaway, while ensuring the monitoring efficiency of the entire backboard range; the heat radiation slope tracking system uses the gap between the backboard and the cabinet as the arrangement space of the related equipment based on the structure of the existing low-voltage switchgear, and uses the backboard as the heat radiation monitoring object, which can realize the corresponding heat radiation slope tracking method at low cost, and has good practicability.

[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 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 control center receives real-time feedback from the drive equipment regarding the location of the thermal radiation monitoring device. , , , Real-time;

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

[0013] S303: The 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 control center determines the 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 control center finds a direction of maximum positive slope of the thermal radiation map and drives the thermal radiation monitoring device to move one unit distance or two unit distances in the direction of maximum positive slope of the thermal radiation map by driving the driving device.

[0016] S306: Steps S301 to S305 are repeatedly executed.

[0017] In an optional implementation, the control center selects a target cell in the backplane area according to a preset rule, which includes:

[0018] Constructing a cell evaluation index ;

[0019] Selecting a cell with a maximum cell evaluation index in all cells as a target cell ;

[0020] Wherein, ;

[0021] is the number of times the cell is selected as a target cell, is the distance between the cell and the first target cell, is the distance between the cell and the second target cell, is a preset value, , and is a proportionality coefficient, and the greater the distance between the cell and the first target cell, the greater the distance between the cell and the second target cell. In an optional implementation, the control center finds a direction of maximum positive slope of the thermal radiation map, which includes:

[0022] The control center iteratively calculates the relative difference between any two thermal radiation values in the thermal radiation map

[0023] selects two cells corresponding to two thermal radiation values with the maximum absolute value of the relative difference as a first calculation cell and a second calculation cell.

[0024] 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 the direction of maximum positive slope.

[0025] In an optional implementation, the method further includes an initial modeling process.

[0026] The initial modeling process includes:

[0027] ​​S101: The central control center constructs a low-voltage switchgear complete set layout diagram in the projection direction of the backboard, the low-voltage switchgear complete set layout diagram comprising a plurality of power equipment, a layout position and a layout posture of each of the power equipment;

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

[0029] S103: The central control center superimposes the thermal radiation theoretical model diagram of each of the power equipment according to the low-voltage switchgear complete set layout diagram to form a first theoretical thermal radiation diagram, each cell in the first theoretical thermal radiation diagram having a corresponding first theoretical thermal radiation value;

[0030] S104: The layout environment of the low-voltage switchgear complete set is measured for room temperature, and a part of the cells of the backboard is measured for a measured thermal radiation value, to establish a corresponding relationship between the room temperature and the measured thermal radiation value of the part of the cells;

[0031] S105: The measured thermal radiation value of the part of the cells is determined according to a real-time room temperature, and the first theoretical thermal radiation diagram is adjusted by the measured thermal radiation value of the part of the cells to obtain a second theoretical thermal radiation diagram.

[0032] Optionally, in step S104, the room temperature has a preset upper limit value.

[0033] Optionally, the first theoretical thermal radiation diagram is adjusted by the measured thermal radiation value of the part of the cells to obtain the second theoretical thermal radiation diagram, which is realized based on a spline surface control point adjustment mode or a double-harmonic equation solving mode.

[0034] Optionally, the method further comprises an evaluation process;

[0035] In step S104 or step S106, before jumping to step S102, the evaluation process is triggered to be executed, the evaluation process comprising:

[0036] S401: The central control center acquires a thermal radiation diagram in real time The cell with the highest thermal radiation value is extracted as an evaluation target cell;

[0037] S402: The thermal radiation value of the evaluation target cell is compared with a second theoretical thermal radiation value of a corresponding cell in the second theoretical thermal radiation diagram to obtain an evaluation result.

[0038] Optionally, the method further comprises a pre-warning process;

[0039] The pre-warning process comprising:

[0040] S501: Pre-warning is performed according to the specific position of the evaluation target cell on the backboard.

[0041] Correspondingly, the application further provides a heat radiation slope tracking system for a low-voltage complete switch device, which is used to realize the heat radiation slope tracking method for the low-voltage complete switch device.

[0042] The heat radiation slope tracking system for the low-voltage complete switch device comprises a central control center, a heat radiation monitoring device for heat radiation monitoring, and a driving device for controlling the movement of the heat radiation monitoring device in a two-dimensional direction.

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

[0044] In summary, the application provides a heat radiation slope tracking method and system for a low-voltage complete switch device. The heat radiation slope tracking method first randomly determines a detection area of a heat radiation monitoring device on a backboard of a cabinet, and then controls the movement of the heat radiation monitoring device according to a maximum positive slope direction of heat radiation, so as to quickly find the position of a local area with the highest temperature, thereby providing basic data support for analysis of heat runaway, while ensuring the monitoring efficiency of the entire backboard range. The heat radiation slope tracking system uses the gap between the backboard and the cabinet body as the arrangement space of the related devices, and uses the backboard as the heat radiation monitoring object, so that the corresponding heat radiation slope tracking method can be realized at low cost based on the structure of the existing low-voltage complete switch device, and the system has good practicability. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 FIG. 1 is a three-dimensional structure diagram of a low-voltage complete switch device.

[0046] Figure 2 FIG. 4 is a data connection structure diagram of the system for the low-voltage complete switch device according to the embodiment of the application.

[0047] Figure 3 FIG. 5 is a front view structure diagram of the system for the low-voltage complete switch device according to the embodiment of the application.

[0048] Figure 4 FIG. 6 is a rear view structure diagram of the system for the low-voltage complete switch device according to the embodiment of the application.

[0049] Figure 5 FIG. 7 is a flowchart of the heat radiation slope tracking method according to the embodiment of the application.

[0050] Figure 6 FIG. 8 is a diagram of a heat radiation theoretical model of the power equipment corresponding to the embodiment of the application. DETAILED DESCRIPTION

[0051] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of the present application.

[0052] For the convenience of understanding, the present application first describes the related physical carriers of the low-voltage switchgear involved.

[0053] Figure 1 The low-voltage switchgear includes a cabinet body 2, a backboard 1, a busbar system 3 and a series of electrical equipment 4 attached to the busbar system. As shown in the accompanying drawings, the electrical equipment is generally installed on the front surface of the backboard, and the backboard serves as an installation carrier. In addition, due to the large area of the backboard, the backboard also has the function of auxiliary heat dissipation. A gap is left between the backboard 1 and the cabinet body 2, which can be used to ensure the insulation between the backboard, the busbar system, the electrical equipment and the cabinet body, and prevent the risk of electric shock. In the embodiments of the present application, the required heat radiation monitoring equipment and driving equipment are arranged in the gap between the backboard 1 and the cabinet body 2 based on the implementation feasibility. The related content of the heat radiation monitoring equipment and the driving equipment will be described later.

[0054] Figure 2 The data connection structure diagram of the system for the low-voltage switchgear in the embodiments of the present application is shown, wherein the dashed line represents the data transmission relationship, and the solid line represents the connection relationship in the physical sense.

[0055] From the logic of the data transmission structure, the system for the low-voltage switchgear in the embodiments of the present application includes a central control center, heat radiation monitoring equipment for heat radiation monitoring, and driving equipment for controlling the movement of the heat radiation monitoring equipment in two-dimensional direction. According to the sequence of data transmission, the heat radiation monitoring equipment sends the heat radiation monitoring data to the central control center, the central control center is used to control the action of the driving equipment, and the action of the driving equipment affects the entity space position of the heat radiation monitoring equipment.

[0056] From the structure, the system for the low-voltage switchgear in the embodiments of the present application includes a central control center, heat radiation monitoring equipment and driving equipment, wherein the central control center and the heat radiation monitoring equipment can be considered as independent structural components, and the driving equipment is a structural component with optional entity structure.

[0057] According to the functional requirements, the driving device needs to drive the thermal radiation monitoring device to move in a two-dimensional space, so that the thermal radiation monitoring device monitors the thermal radiation of the low-voltage complete switch device at multiple points. Specifically, considering the structural characteristics of the low-voltage complete switch device, the thermal radiation monitoring device of the embodiment of the present application is arranged on the back of the back plate in the low-voltage complete switch device, between the cabinet body and the back plate of the low-voltage complete switch device.

[0058] Considering the installation space, the driving device can adopt a trolley structure, or a cross slide structure, and based on the motion stability and positioning accuracy, the cross slide structure is preferably adopted.

[0059] Figure 3 The front view structural schematic diagram of the system for the low-voltage complete switch device of the embodiment of the present application is shown in FIG. 1. Figure 4 The rear view structural schematic diagram of the system for the low-voltage complete switch device of the embodiment of the present application is shown in FIG. 2. Figure 4 In the rear view structural schematic diagram of the system for the low-voltage complete switch device of the embodiment of the present application, the back of the cabinet body is hidden to show the thermal radiation monitoring device and the driving device located in the gap.

[0060] Specifically, when the driving device adopts the cross slide structure, the driving device includes a Y-axis guide rail 7, a Y-axis driving module 5, an X-axis guide rail 6, and an X-axis driving module. Specifically, the Y-axis guide rail is fixed on the side or back cabinet body of the cabinet along the Y direction, the X-axis guide rail is arranged along the X direction, the Y-axis driving module controls the whole X-axis guide rail to move along the Y direction by driving one end of the X-axis guide rail, and in order to balance the force, the two ends of the X-axis guide rail are respectively slidably fitted on the two Y-axis guide rails. An sliding platform 9 is arranged on the X-axis guide rail, the sliding platform 9 is slidably fitted on the X-axis guide rail 6, and the X-axis driving module and the thermal radiation monitoring device 8 are integrally arranged on the sliding platform 9. Under the driving of the X-axis driving module, the sliding platform moves along the X-axis guide rail.

[0061] Specifically, the structural schematic diagram of a group of driving devices and thermal radiation monitoring devices is shown in the schematic diagram of the embodiment of the present application. Figure 4 Theoretically, one X-axis guide rail can cover the whole back plate area under the cabinet, and in the implementation, considering the matching of the device production and the monitoring efficiency, the width of the X-axis guide rail can be designed according to the width of the single cabinet unit, and multiple sets of driving devices and thermal radiation monitoring devices can be combined to realize the coverage monitoring of the back plate area according to the size of the whole cabinet.

[0062] Figure 5 The flow chart of the thermal radiation slope tracking method of the embodiment of the present application is shown in FIG. 4.

[0063] Based on the above-mentioned related structure, the embodiment of the present application provides a thermal radiation slope tracking method for a low-voltage complete switch device, which includes the following steps.

[0064] S10: initial modeling process;

[0065] The process is mainly used to establish a temperature model of the backplane plane in a stable running state in the central control center, thereby providing a reference for monitoring the obtained thermal radiation data.

[0066] S11: initial positioning process;

[0067] The process is mainly used to scientifically determine the starting point of movement for the thermal radiation monitoring device.

[0068] S12: slope tracking process;

[0069] The process is mainly used to control the thermal radiation monitoring device to move along the thermal radiation slope direction of the backplane, so as to reach the temperature highest point of the region.

[0070] S13: evaluation process;

[0071] The information obtained after the thermal radiation monitoring device reaches the local temperature highest point is evaluated.

[0072] S14: early warning process;

[0073] According to the evaluation result, it is determined whether early warning is needed and the type of specific early warning.

[0074] The steps S10 to S14 are described in detail as follows.

[0075] The initial modeling process includes:

[0076] S101: the central control center constructs a low-voltage switchgear plane layout diagram;

[0077] Basically, the low-voltage switchgear plane layout diagram includes a plurality of power equipment, and the arrangement form and arrangement position of each power equipment. Specifically, since the thermal radiation monitoring object is the backplane of the low-voltage switchgear, the low-voltage switchgear plane layout diagram is drawn with the backplane plane as the projection direction, which mainly includes heat-generating components such as busbars in the busbar system, power equipment, and electric control equipment.

[0078] In the embodiment of the present application, the low-voltage switchgear plane layout diagram can refer to Figure 3 schematic structure.

[0079] S102: extract the thermal radiation theoretical model diagram of each power equipment respectively;

[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 diagram of each power device on the low-voltage switchgear plane layout diagram to form a first theoretical thermal radiation diagram;

[0086] According to the layout position of the power device, the thermal radiation theoretical model diagram corresponding to the , thereby forming a first theoretical thermal radiation diagram of the low-voltage switchgear;

[0087] S104: The room temperature of the arrangement environment of the low-voltage switchgear is measured, and the measured thermal radiation value of the partial unit cell of the backboard is measured, and the corresponding relationship between the room temperature and the measured thermal radiation value of the partial unit cell is established;

[0088] In this step, the corresponding relationship between the room temperature and the thermal radiation value of the partial unit cell is determined. It should be noted that the room temperature has an interval setting, and an abnormal room temperature cannot be used as a standard for calibration; specifically, the calibration interval of the room temperature is determined according to the environment of the low-voltage switchgear, and the maximum value is generally limited; when the actual room temperature exceeds the limited maximum room temperature, only the maximum room temperature is used as a reference.

[0089] S105: The measured thermal radiation value of the partial unit cell is determined according to the real-time room temperature, and the first theoretical thermal radiation diagram is adjusted according to the measured thermal radiation value of the partial unit cell to obtain a second theoretical thermal radiation diagram;

[0090] According to the functional requirements, the first theoretical thermal radiation diagram is mainly used to obtain the thermal radiation influence of multiple power devices on the backboard, and it is mainly used to display the thermal radiation distribution rule of the backboard under the influence of multiple thermal radiation sources. Based on the thermal radiation change rule of the first theoretical thermal radiation diagram, the theoretical real-time thermal radiation value of all unit cells is obtained by substituting the measured thermal radiation value of the partial unit cell.

[0091] Specifically, the basis for deriving the second theoretical thermal radiation diagram from the first theoretical thermal radiation diagram is to ensure the continuity of the thermal radiation value slope, that is, to ensure the continuity of the first derivative (C¹ continuity) from a mathematical point of view. Since there may be continuous regions with the same thermal radiation value in the first theoretical thermal radiation diagram (this part of the continuous region does not belong to the curved surface), this part of the continuous region does not participate in the calculation when judging the continuity of the first derivative.

[0092] Specifically, the backplate cell coordinates in the first theoretical thermal radiation map are regarded as X and Y parameters, and the thermal radiation value is regarded as a Z parameter, and accordingly, the first theoretical thermal radiation map can be understood as a curved surface in a three-dimensional space; the curved surface represented by the first theoretical thermal radiation map is adjusted based on the measured thermal radiation values of the partial cells, and the technical means that can be used include spline curved surface (such as B-spline or NURBS) control point adjustment and Biharmonic Equation solving, and from the perspective of computer implementation and visualization, the spline curved surface control point adjustment technology is preferably adopted, which can be better applied to the display of the client UI.

[0093] The initial positioning process includes:

[0094] S201: The control center selects a target cell in the backplate area according to a preset rule , and drives the thermal radiation monitoring device to move to the target cell through a driving device, cumulative number of the target cell is obtained;

[0095] Since the purpose of the thermal radiation tracking of the embodiment of the application is to track the highest temperature point in a local area, the initial position of the thermal radiation monitoring device can be random. Based on the monitoring coverage and monitoring timeliness of the entire backplate, the initial positioning position of the thermal radiation monitoring device needs to be further designed.

[0096] Simply, since the purpose of the thermal radiation tracking is to track the highest temperature point in a local area, in the initial modeling process, the backplate can be first divided into regions, and the entire backplate is divided into several “mountain” type regions from the highest thermal radiation point or the highest thermal radiation region in the second theoretical thermal radiation map as the center according to the angle of the thermal radiation slope drop, and then the initial positioning point is selected in different “mountain” type regions. However, this embodiment has the problem of missing detection when the low-voltage complete switch device has an unpredictable risk heating point, and has a lag in monitoring.

[0097] Therefore, in the embodiment of the application, the control center selects a target cell in the backplate area according to a preset rule includes:

[0098] Constructing a cell evaluation index ;

[0099] Selecting a cell with the maximum cell evaluation index value from all cells as the target cell ;

[0100] Among them, ;

[0101] The cell 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 control center receives real-time feedback from the drive equipment regarding the location of the thermal radiation monitoring device. , , , Real-time;

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

[0107] S303: The 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 control center determines the thermal radiation map. whether all the thermal radiation values are equal, if the thermal radiation map whether all the thermal radiation values are equal, and jump to step S201;

[0109] S305: The control center finds the direction of the maximum positive slope of the thermal radiation map, and drives the thermal radiation monitoring device to move one unit distance or two unit distances in the direction of the maximum positive slope of the thermal radiation map through the driving device.

[0110] S306: Steps S301 to S305 are repeatedly executed.

[0111] Specifically, in the slope tracking process, the direction of the maximum positive slope of the thermal radiation map obtained by the thermal radiation monitoring device is obtained, and the movement position of the thermal radiation monitoring device at the next moment is controlled according to the direction. The judgment in steps S302 and S304 is to determine whether the thermal radiation monitoring device has reached the position of the maximum thermal radiation value in the local area.

[0112] Specifically, the control center traverses the thermal radiation map The relative difference between any two thermal radiation values is calculated, the two cells corresponding to the two thermal radiation values with the maximum absolute value of the relative difference are selected as the first calculation cell and the second calculation cell, and 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 maximum positive slope direction.

[0113] In addition, the unit distance is directional, for example, if the maximum positive slope direction is X or Y, then the unit distance is one cell in the X or Y direction; if the maximum positive slope direction is diagonal, then the unit distance is one cell in the corresponding diagonal direction (numerically, the distance of one cell in the diagonal direction is times the distance of one cell in the X or Y direction). Specifically, driving the thermal radiation monitoring device to move one unit distance in the direction of the maximum positive slope of the thermal radiation can determine the running track of the thermal radiation monitoring device with higher precision, and driving the thermal radiation monitoring device to move two unit distances in the direction of the maximum positive slope of the thermal radiation can quickly reach the highest point / region of the local area.

[0114] The evaluation process includes

[0115] S401: The control center extracts the cell with the highest thermal radiation value from the real-time thermal radiation map as the evaluation target cell;

[0116] Specifically, the evaluation process is triggered by the jump execution step condition of step S302 and step S304. The latest acquired thermal radiation map is temporarily stored at the time of jumping to execute step S201 according to step S302 and step S304. The cell with the highest thermal radiation value in the thermal radiation map is extracted as the evaluation target cell.

[0117] S402: Compare the thermal radiation value of the evaluation target cell with the second theoretical thermal radiation value of the corresponding cell in the second theoretical thermal radiation map to obtain an evaluation result.

[0118] Generally, the difference in thermal radiation value can be used as a comparison evaluation index, but 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 map is within a preset range, it indicates that the thermal radiation value of the evaluation target cell is normal, and if the thermal radiation value of the evaluation target cell 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 evaluation target cell is abnormal, jump to execute the early warning process.

[0120] The early warning process includes:

[0121] S501: Early warning according to the specific position of the evaluation target cell on the backboard;

[0122] As can be seen from the foregoing description, the second theoretical thermal radiation map divides a plurality of "mountain" type regions, and the highest peak position of the "mountain" type region is the temperature highest point of the corresponding region; if the evaluation target cell is located at the highest peak position of the "mountain" type region associated with a single power equipment, it indicates that the thermal runaway object is most likely to occur on the corresponding power equipment, at which time the corresponding power equipment can be checked to eliminate hidden dangers; if the evaluation target cell is located at a position where the "mountain" type region is actually superimposed by thermal radiation theoretical model maps of two or more power equipments, it may be necessary to simultaneously eliminate the associated power equipments; if the position of the evaluation target cell is not related to the highest peak region of all "mountain" type regions in the second theoretical thermal radiation map, it may be a thermal runaway risk caused by unknown reasons, and it is necessary to go to the scene as soon as possible to handle the problem and ensure the operation safety of the complete low-voltage equipment.

[0123] In summary, the application provides a heat radiation slope tracking method and system for low-voltage switchgear, which first randomly determines a detection area of a heat radiation monitoring device on a backboard of a cabinet, then controls the movement of the heat radiation monitoring device according to a maximum positive slope direction of heat radiation, so as to quickly find the position of the highest temperature point in a local area, and provide basic data support for analysis of heat runaway, while ensuring the monitoring efficiency of the entire backboard range; the heat radiation slope tracking system uses the gap between the backboard and the cabinet as the arrangement space of the related devices, and uses the backboard as the heat radiation monitoring object, so that the corresponding heat radiation slope tracking method can be realized at low cost based on the structure of the existing low-voltage switchgear, and has good practicability.

[0124] The heat radiation slope tracking method and system for low-voltage switchgear provided by the embodiments of the application are described in detail above, and the principles and implementation manners of the application are described by applying specific examples; the above description of the embodiments is only used to help understand the method of the application and its core idea; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the application, and the content of the description should not be understood as a limitation of the application.

Claims

1. A heat radiation slope tracking method for a low-voltage switchgear, based on heat radiation monitoring accuracy of a heat radiation monitoring device, a backboard of the low-voltage switchgear is divided into a plurality of unit cells, the heat radiation monitoring device has a heat radiation monitoring area, wherein, the heat radiation monitoring area is divided into a plurality of unit cells according to the heat radiation monitoring accuracy of the heat radiation monitoring device, and the heat radiation monitoring accuracy of the heat radiation monitoring device is determined according to the heat radiation monitoring area of the heat radiation monitoring device and the heat radiation monitoring accuracy of the heat radiation monitoring device. ， ， ， ； ​​​ Its characterized in that, comprising initial positioning process and slope tracking process; Said initial positioning process comprises: S201: The control center selects a target cell in the backboard area according to a preset rule and drives the thermal radiation monitoring device to move to the target cell through a driving device, is the cumulative number of the target cell; Said slope tracking process comprises: S301: The control center receives the position of the thermal radiation monitoring device fed back by the driving device in real time , , , is a real-time time; S302: The control center judges whether there is , is the historical time in the same gradient tracking process, if there is , jump to step S201; S303: The control center receives the thermal radiation map fed back by the thermal radiation monitoring device in real time , acquire four thermal radiation values of four cells in the thermal radiation monitoring area at the moment ​ S304: The control center determines the 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 control center finds the maximum positive slope direction of thermal radiation according to the thermal radiation map, and drives the thermal radiation monitoring device to move a unit distance or two unit distances in the maximum positive slope direction of thermal radiation by driving equipment; S306: repeat steps S301 to S305.

2. A heat radiation slope tracking method for a low voltage switchgear assembly according to claim 1, characterized in that, Said control center selects a target cell in the backboard area according to a preset rule, comprising: Building cell evaluation index ; Selecting the cell with the maximum value of the evaluation index in all cells as the target cell ; wherein ; is a cell is the number of times the cell is selected as a target cell, is a cell is the distance between the cell and the target cell, is a preset value, , and is a proportionality coefficient, and the greater the distance between the cell and the target cell, the greater the distance between the cell and the target cell.

3. The heat radiation slope tracking method for a low voltage switchgear according to Claim 1, wherein Said control center finds the maximum positive slope direction of thermal radiation according to the thermal radiation map, comprising: The control center traverses the calculated thermal radiation map The relative difference of any two thermal radiation values, and selects 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 calculation cell with smaller thermal radiation value points to the calculation cell with larger thermal radiation value as the maximum positive slope direction.

4. The heat radiation slope tracking method for a low voltage switchgear according to Claim 1, wherein Further comprising initial modeling process; Said initial modeling process comprises: S101: the central control center constructs a low-voltage switchgear layout map with the backboard as the projection direction, which includes a plurality of power equipment, the arrangement position and attitude of each power equipment; S102: the central control center extracts the thermal radiation theoretical model diagram of each power equipment in the low-voltage switchgear layout map respectively; S103: the central control center superimposes the thermal radiation theoretical model diagram of each power equipment according to the low-voltage switchgear layout map to form a first theoretical thermal radiation map, each cell in the first theoretical thermal radiation map has a corresponding first theoretical thermal radiation value; S104: measure the room temperature of the arrangement environment of the low-voltage switchgear and the measured thermal radiation value of part of the cells of the backboard to establish the corresponding relationship between the room temperature and the measured thermal radiation value of the part of the cells; S105: determine the measured thermal radiation value of the part of the cells according to the real-time room temperature, and adjust the first theoretical thermal radiation map with the measured thermal radiation value of the part of the cells to obtain a second theoretical thermal radiation map.

5. A heat radiation slope tracking method for a low voltage switchgear assembly according to claim 4, characterized in that, In step S104, the room temperature has a preset upper limit value.

6. The heat radiation slope tracking method for a low voltage switchgear according to claim 4, wherein Adjusting the first theoretical thermal radiation map with the measured thermal radiation value of the part of the cells to obtain a second theoretical thermal radiation map is realized based on spline control point adjustment mode or double harmonic equation solving mode.

7. The heat radiation slope tracking method for a low voltage switchgear according to claim 4, wherein Further comprising evaluation process; In step S104 or step S106, before jumping to step S102, the evaluation process is triggered, comprising: S401: The central control center extracts the highest thermal radiation value cell as the evaluation target cell from the real-time acquired thermal radiation image. extracts the highest thermal radiation value cell as the evaluation target cell; S402: compare the thermal radiation value of the evaluation target cell with the second theoretical thermal radiation value of the corresponding cell in the second theoretical thermal radiation map to obtain an evaluation result.

8. A heat radiation slope tracking method for a low voltage switchgear assembly according to claim 7, characterized in that, Further comprising early warning process; Said early warning process comprises: S501: early warning according to the specific position of the evaluation target cell on the backboard.

9. A thermal radiation slope tracking system for low voltage switchgear assemblies, characterized by, The thermal radiation slope tracking system for low-voltage switchgear according to any one of claims 1 to 8; Said thermal radiation slope tracking system for low-voltage switchgear comprises a central control center, a thermal radiation monitoring device for thermal radiation monitoring, and a driving device for controlling the movement of the thermal radiation monitoring device in two-dimensional direction.

10. A thermal radiation slope tracking system for low voltage switchgear assemblies as defined in claim 9, wherein, The driving device is a cross slide structure. The driving device is a cross slide structure.

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