A switch cabinet monitoring and protection device and its use method

Abstract

The present invention relates to the technical field of switch cabinets, and in particular to a switch cabinet monitoring and protection device and a method of using the same, comprising a plurality of switch cabinet bodies, a protection module arranged in the switch cabinet body, a patrol monitoring mechanism and a monitoring control module, wherein the protection module comprises a relay, a circuit breaker, a transformer and a monitoring sensor arranged in the switch cabinet body, the patrol monitoring mechanism comprises an electric slide rail and a camera mechanism, the protection module uploads data to a server, and the monitoring control module is connected to the server via a network and receives data uploaded by the protection module. The present invention controls the patrol monitoring mechanism to monitor and move the switch cabinet through a current monitoring control unit, and records the signals and operating status on the switch cabinet, so that the staff can obtain the video information on the scene in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of switch cabinets, and in particular to a switch cabinet monitoring and protection device and a use method thereof. Background Art

[0002] Switchgear is an important electrical equipment in the power system, which plays the role of power distribution, electric energy conversion, control and protection circuit. There are many kinds of switchgear, among which they can be divided into low-voltage switchgear and high-voltage switchgear according to voltage level. In the low-voltage switchgear connection of the three-phase power system, several low-voltage switchgears can be arranged in a row in the same electrical room and connected to the same three-phase main busbar. Through several switchgears in a row, power distribution and control protection are carried out for different partitions of the same operating area. In the automated electrical room with rows of switchgear, there should be a patrol robot to monitor the electrical room in real time. The patrol robot can obtain the on-site images and record the data information on the switchgear, so that the problem points can be found in time and an alarm can be given in the event of an accident.

[0003] In the prior art, inspection robots often use electric slide rails to drive the inspection robots to move within the regional tracks corresponding to the switch cabinets to implement monitoring and protection. The patrol paths of existing inspection robots are relatively conventional, and they often adopt a constant-speed reciprocating patrol method. When the current, voltage or temperature of some switch cabinets shows an upward trend, it is difficult for conventional inspection robots to intelligently plan the patrol path and the patrol time to the designated switch cabinet based on the data changes generated by these switch cabinets. They are not intelligent enough and the monitoring and protection effect is not good. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the background technology and to propose a switch cabinet monitoring and protection device and a use method thereof.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a switch cabinet monitoring and protection device, comprising a plurality of switch cabinet bodies, a protection module arranged in the switch cabinet body, a patrol monitoring mechanism and a monitoring control module, a plurality of switch cabinet bodies are integrated with display screens and signal lights, the switch cabinet body is connected to a low-voltage main bus bar, the main bus bar is a three-phase bus bar, three current transformers CT corresponding to the three-phase current are arranged in any switch cabinet body, the protection module comprises a relay, a circuit breaker, a transformer and a monitoring sensor arranged in the switch cabinet body, and a thermal imager for obtaining the internal temperature is arranged on the inner side wall of the cabinet door of any switch cabinet body;

[0006] The operating data in the switch cabinet body is displayed on the display screen through the monitoring sensor and fed back on the signal light. The patrol monitoring mechanism is used to obtain the video information on the scene and record the information on the display screen and the signal light. The patrol monitoring mechanism includes an electric slide rail and a camera mechanism. The protection module uploads the data to the server. The monitoring control module is connected to the server through the network and receives the data uploaded by the protection module. The monitoring control module includes a current monitoring control unit and a temperature monitoring control unit. The patrol monitoring mechanism is controlled by the current monitoring control unit and the temperature monitoring control unit to implement the first adjustment patrol plan and the second adjustment patrol plan respectively.

[0007] The current monitoring control unit includes a first processing unit and a second processing unit.

[0008] In the above-mentioned switch cabinet monitoring and protection device, the current monitoring control unit is used to obtain the zero-sequence current Ix and the detection current Ij of all switch cabinets, perform mean calculation on the detection current Ij to obtain the average detection current Ia, determine whether the zero-sequence current Ix is 0, and control the first processing unit to implement the first processing scheme and control the first processing unit to implement the second processing scheme according to whether the zero-sequence current Ix is equal to 0 or not equal to 0. The first processing scheme is specifically:

[0009] Implementing the first judgment method on all detection currents Ij;

[0010] The first judgment method is specifically as follows: if the detection current Ij belongs to [Ia-I1, Ia+I1] during the detection period, the detection current Ij is judged to be normal; I1 is the normal current change value; if the detection current Ij is greater than Ia+I1 during the detection period, the detection current Ij of the switch cabinet is marked as a slightly abnormal detection current Ij;

[0011] Determine whether the mild abnormality detection current Ij is less than Ia+I2; I2 is the short-circuit current change value; if the mild abnormality detection current Ij is not less than Ia+I2, it is determined that a short circuit has occurred, a tripping operation is implemented and an alarm is given; if the mild abnormality detection current Ij is less than Ia+I2, the mild abnormality detection current Ij is marked as the first moderate abnormality detection current Ij and it is determined to be connected to a high-power device.

[0012] In the above switch cabinet monitoring and protection device, the second processing unit is used to implement a second processing scheme, and the second processing scheme is specifically:

[0013] The detection current Ij is judged by the second judgment method whether the slightly abnormal detection current Ij is increasing in the next detection period;

[0014] The second judgment method is specifically:

[0015] It is determined that the slight abnormal detection current Ij is greater than Ia+I3 in the next detection period; I3 is the ground fault current change value; if the slight abnormal detection current Ij is greater than Ia+I3, it is determined that the switch cabinet corresponding to the slight abnormal detection current Ij has a ground fault.

[0016] In the above-mentioned switch cabinet monitoring and protection device, the patrol monitoring mechanism is provided with a recording waiting time for recording the data of the display screen and the signal light on the main body of the electronic switch cabinet; during the recording waiting time of the patrol monitoring mechanism, the current mild abnormality detection current Ij is obtained according to the acquisition period of 100ms, and the current change curve is drawn according to the first two-dimensional coordinate system formed by the mild abnormality detection current Ij and the timestamp, and the current change curve is segmented at the inflection point to obtain the current segmented change curve, and the absolute value of the slope of each segment of the curve is obtained, and the segmented curve with the largest absolute value of the slope and the segmented curve with the smallest absolute value of the slope are eliminated, and the maximum and minimum values ​​of the mild abnormality detection current Ij on the segmented curve are median calculated to obtain the median detection current Ij of the segmented curve, and the current standard current curve is drawn according to the two-dimensional coordinates formed by the median detection current Ij and the timestamp; wherein the abscissa of the first two-dimensional coordinate system is the timestamp, and the ordinate is the value of the mild abnormality detection current Ij;

[0017] The current change monitoring value A is obtained by calculating the area enclosed by the segmented current change curve drawn in the next detection period and the standard current curve drawn in the previous detection period.

[0018] In the above-mentioned switch cabinet monitoring and protection device, data analysis is performed on the current change monitoring value A. If the change monitoring value A is greater than 0, it is determined that the mild abnormal detection current Ij is on the rise, the mild abnormal detection current Ij is marked as a severe abnormal detection current Ij, and the corresponding switch cabinet load is determined to be unbalanced, and an inspection is notified;

[0019] If the change monitoring value A is not greater than 0, the third judgment method is used to determine whether the slightly abnormal detection current Ij is in a maintained state in the next detection period.

[0020] In the above switch cabinet monitoring and protection device, the third judgment method is specifically:

[0021] Obtain the slope of each current curve of the segmented current change curve drawn during the current detection period, obtain the segmented current change rate B by calculating the absolute value of the slope, and perform data analysis on the segmented current change rate B;

[0022] If the current change rate B of any segment is not greater than 0.2, it is determined that the slight abnormal detection current Ij is maintained in the next detection period, and the slight abnormal detection current Ij is Marked as the first moderate abnormal current Ij;

[0023] If there is a segmented current change rate B greater than 0.2, the mild abnormal detection current Ij is judged to be fluctuating and is marked as the second moderate abnormal detection current Ij; it is judged that the load in the switch cabinet marked as the moderate abnormal detection current Ij is unbalanced and voltage fluctuations occur.

[0024] In the above switch cabinet monitoring and protection device, the first adjustment and circuit scheme is specifically:

[0025] A circuit parameter L is added to the first moderate abnormality detection current Ij, a circuit parameter M is added to the second moderate abnormality detection current Ij, and a circuit parameter N is added to the severe abnormality detection current Ij; wherein, 1 <L<M<N;

[0026] Generate the corresponding path monitoring value y(j) according to the detection current Ij. When the detection current Ij is normal, y(j) is equal to 0; when the detection current Ij is slightly abnormal, y(j) is equal to 1; when the detection current Ij is the first moderate abnormality or the second moderate abnormality, y(j) is set to L and M respectively; when the detection current Ij is severely abnormal, y(j) is equal to N;

[0027] Draw a second two-dimensional coordinate system based on the two-dimensional coordinates formed by the switch cabinet number j and the path monitoring value y(j), filter the area where y(j) is equal to 0, divide the continuous path monitoring values ​​y(j) into the same monitoring area and count the total number of path monitoring values ​​in the same monitoring area; divide the discontinuous path monitoring values ​​y(j) into different monitoring areas, count the areas of all monitoring areas and number them to obtain the first patrol area monitoring value Si, where S is the area of ​​the monitoring area, i is the monitoring area number, i is a positive integer and i is less than the total number of switch cabinets n;

[0028] If the total number of path monitoring values ​​in the monitoring area is greater than 1, the first circuit area monitoring value Si is obtained by multiplying the path monitoring value y(j) of the same monitoring area; if the total number of path monitoring values ​​is equal to 1, the first circuit area monitoring value Si of the monitoring area is equal to the path monitoring value y(j);

[0029] According to the first round of time processing formula: ;

[0030] The first repeated patrol time t1i of the next patrol to the monitoring area is calculated; T is the standard patrol cycle.

[0031] In the above-mentioned switch cabinet monitoring and protection device, the second detection scheme is specifically:

[0032] The temperature monitoring control unit is used to obtain the detection temperatures Tj of several switch cabinets in the monitoring area in the first detection scheme, obtain the highest temperature among the several detection temperatures Tj in the same monitoring area through a linear search algorithm and set it as the detection temperature Ti of the monitoring area;

[0033] The second adjustment tour plan is as follows:

[0034] The second circuit time processing formula is: ;

[0035] The second repetitive cycle time t2i is calculated; k1 is the first reduction coefficient.

[0036] In the above switch cabinet monitoring and protection device, the first repetitive patrol time t1i and the calculated second repetitive patrol time t2i are processed by formula, specifically, by the average repetitive patrol time processing formula: ;

[0037] The average repeated patrol time ta is calculated, and the patrol monitoring agency is controlled to patrol the monitoring area according to the average repeated patrol time ta; w1 and w2 are the weight coefficients of the first repeated patrol time t1i and the second repeated patrol time t2i, respectively. <w2;

[0038] If the first repeated patrol time ta of different monitoring areas conflicts, the average repeated patrol time is preferred. The monitoring area with the smallest value will be patrolled.

[0039] In addition, the present invention also discloses a method for using a switch cabinet monitoring and protection device, and the specific steps are as follows:

[0040] S1. Installation inspection: ensure that the shooting range of the thermal imager covers the main heating parts of the switch cabinet body;

[0041] S2. Set the patrol mode: adjust the initial moving speed of the patrol monitoring mechanism to a suitable value to ensure that the on-site images taken by the patrol monitoring mechanism can be clearly obtained within a certain adjustment range.

[0042] Compared with the prior art, the advantages of the present invention are:

[0043] 1. The current monitoring control unit controls the patrol monitoring mechanism to monitor and move the switch cabinet, and records the signals and operating status on the switch cabinet, so that the staff can obtain the video information on the scene in real time.

[0044] 2. The data on the switch cabinet is calculated by the current monitoring control unit to obtain the detection current Ij in each switch cabinet, and the detection current Ij is analyzed. Different degrees of abnormal marks are applied to the detection current Ij according to the analysis results, and the switch cabinets are distinguished according to different abnormal marks, which is convenient for the monitoring effect of the patrol monitoring agency.

[0045] 3. The path monitoring value y(j) on the switch cabinet corresponding to the abnormal detection current Ij and the normal detection current Ij is formed, and the switch cabinet is divided into different monitoring areas according to the path monitoring value y(j). The first patrol area monitoring value Si of the monitoring area is obtained by adding patrol parameters to the detection current Ij. The first repeated patrol time t1i of the monitoring area is obtained through the first patrol time processing formula, which optimizes the path movement mode of the patrol monitoring mechanism and improves the monitoring effect.

[0046] 4. The detected temperature Ti of the monitoring area is obtained through the temperature monitoring control unit, the second repeated patrol time t2i of the monitoring area is obtained through the second patrol time processing formula, and the average repeated patrol time ta is calculated through the average repeated patrol time processing formula. By bidirectionally monitoring the current and temperature of the switch cabinet and controlling the patrol monitoring mechanism to patrol according to the average repeated patrol time ta, the monitoring effect of the switch cabinet is further improved, and the safety of the switch cabinet operation is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the planar structure of the present invention.

[0048] Figure 2 It is a structural schematic diagram of the monitoring and control module of the present invention.

[0049] Figure 3 It is a flow chart of the first detection scheme of the present invention.

[0050] Figure 4 It is a flow chart of the second detection scheme of the present invention.

[0051] In the figure: 1. switch cabinet body; 101. display screen; 102. signal light; 2. patrol monitoring mechanism; 201. electric slide rail; 202. camera mechanism; 3. monitoring control module; 301. current monitoring control unit; 3011. first processing unit; 3012. second processing unit; 302. temperature monitoring control unit. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0053] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0054] Example: Refer to Figure 1-Figure 2 A switch cabinet monitoring and protection device comprises a plurality of switch cabinet bodies 1, a protection module arranged in the switch cabinet body 1, a patrol monitoring mechanism 2 and a monitoring control module 3, characterized in that: a display screen 101 and a signal light 102 are integrated on the plurality of switch cabinet bodies 1, the switch cabinet body 1 is connected to a low-voltage main bus bar, the main bus bar is a three-phase bus bar, three current transformers CT corresponding to the three-phase current are arranged in any switch cabinet body 1, the protection module comprises a relay, a circuit breaker, a transformer and a monitoring sensor arranged in the switch cabinet body 1, and a thermal imager for obtaining the internal temperature is arranged on the inner side wall of the cabinet door of any switch cabinet body 1;

[0055] The operating data in the switch cabinet body 1 is displayed on the display screen 101 through the monitoring sensor and fed back on the signal light 102. The patrol monitoring mechanism 2 is used to obtain the video information on the scene and record the information on the display screen 101 and the signal light 102. The patrol monitoring mechanism 2 includes an electric slide rail 201 and a camera mechanism 202. The protection module uploads the data to the server. The monitoring control module 3 is connected to the server through the network and receives the data uploaded by the protection module. The monitoring control module 3 includes a current monitoring control unit 301 and a temperature monitoring control unit 302;

[0056] Example 2: Reference Figure 2-Figure 3 , the current monitoring control unit 301 is used to obtain the zero-sequence current Ix of the total busbar and the detection current Ij in each switch cabinet, perform a first data analysis on the detection current Ij, obtain a first analysis result, implement a first detection scheme according to the first analysis result, and control the patrol monitoring mechanism 2 to implement a first adjustment control scheme; the detection current is obtained based on the median calculation of the maximum current and the minimum current in the three-phase circuit current in the switch cabinet; j represents the number of the switch cabinet, j=1, 2, ..., n; n represents the total number of switch cabinets;

[0057] Specifically, the number j of the switch cabinet can be obtained by means of a radio frequency tag, and the tag can be obtained by means of existing technologies, such as by setting a QR code on the surface of the switch cabinet, and the details will not be repeated in detail;

[0058] The temperature monitoring control unit 302 is used to obtain the detected temperature of each switch cabinet, perform a second data analysis on the detected temperature, obtain a second analysis result, implement a second detection scheme according to the second analysis result, and control the patrol monitoring mechanism 2 to implement a second adjustment control scheme;

[0059] Implement the first detection plan and the second detection plan on the switch cabinet at the same time;

[0060] The first detection scheme is as follows:

[0061] Step 101: Obtain the zero-sequence current Ix and the detection current Ij of all switch cabinets, perform mean calculation on the detection current Ij to obtain the average detection current Ia, determine whether the zero-sequence current Ix is 0, and control the first processing unit 3011 to implement the first processing scheme and the second processing scheme according to whether the zero-sequence current Ix is equal to 0 or not. The first processing scheme is specifically:

[0062] Step 102: Implement the first determination method on all detection currents Ij;

[0063] The first judgment method is specifically as follows: if the detection current Ij belongs to [Ia-I1, Ia+I1] during the detection period, the detection current Ij is judged to be normal; I1 is the normal current change value; if the detection current Ij is greater than Ia+I1 during the detection period, the detection current Ij of the switch cabinet is marked as a slightly abnormal detection current Ij;

[0064] If no slightly abnormal detection current Ij appears during the detection period, the standard patrol scheme is implemented and step 105 is executed; if a slightly abnormal detection current Ij appears during the detection period, the first adjustment patrol scheme is implemented; wherein, if the detection current Ij is greater than Ia+I1 any time during the detection period, it is recorded as slightly abnormal; the detection period is the time interval for the patrol monitoring mechanism 2 to reach the same switch cabinet in adjacent patrol paths;

[0065] The standard patrol scheme is specifically as follows: controlling the patrol monitoring mechanism 2 to perform patrol monitoring in accordance with the standard patrol cycle T;

[0066] Step 103: determine whether the slight abnormality detection current Ij is less than Ia+I2; I2 is the short-circuit current change value; if the slight abnormality detection current Ij is not less than Ia+I2, it is determined that a short circuit occurs, a tripping operation is performed and an alarm is given; if the slight abnormality detection current Ij is less than Ia+I2, the slight abnormality detection current Ij is marked as the first moderate abnormality detection current Ij and it is determined to connect to a high-power device;

[0067] The steps of implementing the second treatment plan include:

[0068] Step 104: using a second determination method to determine whether the slightly abnormal detection current Ij is on the rise in the next detection period;

[0069] The second judgment method is specifically:

[0070] It is determined that the slight abnormal detection current Ij is greater than Ia+I3 in the next detection period; I3 is the ground fault current change value; if the slight abnormal detection current Ij is greater than Ia+I3, it is determined that the switch cabinet corresponding to the slight abnormal detection current Ij has a ground fault;

[0071] Step 105: The patrol monitoring mechanism 2 is provided with a recording waiting time for recording the data of the display screen 101 and the signal light 102 on the main body of the electronic switch cabinet. During the recording waiting time of the patrol monitoring mechanism 2, the current mild abnormality detection current Ij is obtained according to the acquisition cycle of 100ms, and the current change curve is drawn according to the first two-dimensional coordinate system formed by the mild abnormality detection current Ij and the timestamp. The current change curve is segmented at the inflection point to obtain the current segmented change curve, and the absolute value of the slope of each segment of the curve is obtained. The segmented curve with the largest absolute value of the slope and the segmented curve with the smallest absolute value of the slope are eliminated, and the maximum and minimum values ​​of the mild abnormality detection current Ij on the segmented curve are median-calculated to obtain the median detection current Ij of the segmented curve, and the current standard current curve is drawn according to the two-dimensional coordinates formed by the median detection current Ij and the timestamp; wherein, the abscissa of the first two-dimensional coordinate system is the timestamp, and the ordinate is the value of the mild abnormality detection current Ij;

[0072] The area enclosed by the segmented current change curve drawn in the next detection period and the standard current curve drawn in the previous detection period is calculated to obtain the current change monitoring value A; wherein; the area above the standard current curve is recorded as a positive value, and the area above the standard current curve is recorded as a negative value; the area is calculated according to the ordinate of the first two-dimensional coordinate system;

[0073] Step 106: Perform data analysis on the current change monitoring value A. If the change monitoring value A is greater than 0, it is determined that the mild abnormal detection current Ij is on the rise, the mild abnormal detection current Ij is marked as a severe abnormal detection current Ij, and the corresponding switch cabinet load is determined to be unbalanced, and an inspection is notified;

[0074] If the change monitoring value A is not greater than 0, the third judgment method is used to determine whether the slightly abnormal detection current Ij is in a maintained state in the next detection period;

[0075] The third judgment method is specifically:

[0076] Step 107: Obtain the slope of each current curve of the segmented current change curve drawn in the current detection period, obtain the segmented current change rate B by calculating the absolute value of the slope, and perform data analysis on the segmented current change rate B;

[0077] If the current change rate B of any segment is not greater than 0.2, it is determined that the mild abnormal detection current Ij is maintained in the next detection period, and the mild abnormal detection current is marked as the first moderate abnormal current Ij;

[0078] If there is a segmented current change rate B greater than 0.2, it is judged that the mild abnormal detection current Ij is fluctuating and marked as the second moderate abnormal detection current Ij; it is judged that the load in the switch cabinet marked as the moderate abnormal detection current Ij is unbalanced and voltage fluctuation occurs;

[0079] Step 108: The first adjustment circuit scheme is specifically: adding a circuit parameter L to the first moderate abnormality detection current Ij, adding a circuit parameter M to the second moderate abnormality detection current Ij, and adding a circuit parameter N to the severe abnormality detection current Ij; wherein, 1 <L<M<N;

[0080] Generate the corresponding path monitoring value y(j) according to the detection current Ij. When the detection current Ij is normal, y(j) is equal to 0; when the detection current Ij is slightly abnormal, y(j) is equal to 1; when the detection current Ij is the first moderate abnormality or the second moderate abnormality, y(j) is set to L and M respectively; when the detection current Ij is severely abnormal, y(j) is equal to N;

[0081] Draw a second two-dimensional coordinate system based on the two-dimensional coordinates formed by the switch cabinet number j and the path monitoring value y(j), filter the area where y(j) is equal to 0, divide the continuous path monitoring values ​​y(j) into the same monitoring area and count the total number of path monitoring values ​​in the same monitoring area; divide the discontinuous path monitoring values ​​y(j) into different monitoring areas, count the areas of all monitoring areas and number them to obtain the first patrol area monitoring value Si, where S is the area of ​​the monitoring area, i is the monitoring area number, i is a positive integer and i is less than the total number of switch cabinets n; wherein the switch cabinet number j and the path monitoring value y(j) are set as the horizontal coordinate and the vertical coordinate respectively;

[0082] If the total number of path monitoring values ​​in the monitoring area is greater than 1, the first circuit area monitoring value Si is obtained by multiplying the path monitoring value y(j) of the same monitoring area; if the total number of path monitoring values ​​is equal to 1, the first circuit area monitoring value Si of the monitoring area is equal to the path monitoring value y(j);

[0083] According to the first round of time processing formula: ;

[0084] Calculate the first repeated patrol time t1i of the next patrol to the monitoring area;

[0085] Specifically, the direction of the next patrol can be the initial direction from switch cabinet number 1 to number n or the reverse direction; wherein, each time a monitoring area is reached, the recording waiting time is set to 10s, and the recording waiting time is calculated separately and is not included in the first repeated patrol time t1i;

[0086] The second detection scheme is as follows:

[0087] Step 1: Obtain the detection temperatures Tj of several switch cabinets in the monitoring area in the first detection scheme, obtain the highest temperature among the several detection temperatures Tj in the same monitoring area through a linear search algorithm and set it as the detection temperature Ti of the monitoring area;

[0088] The second adjustment tour plan is as follows:

[0089] The second circuit time processing formula is: ;

[0090] The second repetition time t2i is calculated; k1 is the first reduction coefficient; wherein the linear search algorithm is a prior art and will not be described in detail;

[0091] Step 2: Process the first repetition time t1i and the calculated second repetition time t2i using a formula. Specifically, the average repetition time processing formula is: ;

[0092] The average repeated patrol time ta is calculated, and the patrol monitoring mechanism 2 is controlled to patrol the monitoring area according to the average repeated patrol time ta; w1 and w2 are the weight coefficients of the first repeated patrol time t1i and the second repeated patrol time t2i, respectively. <w2;

[0093] If the first repeated patrol time ta of different monitoring areas conflicts, the average repeated patrol time is preferred. Patrol the monitoring area with the smallest value;

[0094] Step 3: Implement a priority queuing method for the average repeated patrol time ta corresponding to the monitoring area that has not been patrolled, specifically multiplying the next average repeated patrol time ta of the monitoring area by the second reduction coefficient k2 and Update. If the area is still not patrolled in the next patrol, repeat step 3 until the monitoring area is patrolled.

[0095] The above-mentioned detection current Ij and detection temperature Tj are collected and updated after each patrol recording.

[0096] In addition, the present invention also discloses a method for using a switch cabinet monitoring and protection device, and the specific steps are as follows:

[0097] S1. Installation inspection: ensure that the shooting range of the thermal imager covers the main heating parts of the switch cabinet body 1;

[0098] S2. Setting the patrol mode: adjusting the initial moving speed of the patrol monitoring mechanism 2 to a suitable value to ensure that the on-site images captured by the patrol monitoring mechanism 2 can be clearly obtained within a certain adjustment range.

[0099] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0100] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A switch cabinet monitoring and protection device, comprising a plurality of switch cabinet bodies (1), a protection module arranged in the switch cabinet bodies (1), a patrol monitoring mechanism (2) and a monitoring control module (3), characterized in that: A display screen (101) and a signal light (102) are integrated on the switch cabinet bodies (1), the switch cabinet bodies (1) are connected to a low-voltage main busbar, the main busbar is a three-phase busbar, three current transformers CT corresponding to the three-phase currents are arranged in any switch cabinet body (1), the protection module comprises a relay, a circuit breaker, a transformer and a monitoring sensor arranged in the switch cabinet body (1), and a thermal imager for obtaining the internal temperature is arranged on the inner side wall of the cabinet door of any switch cabinet body (1); The operating data in the switch cabinet body (1) is displayed on a display screen (101) through a monitoring sensor and fed back on a signal light (102); the patrol monitoring mechanism (2) is used to obtain on-site video information and record information on the display screen (101) and the signal light (102); the patrol monitoring mechanism (2) comprises an electric slide rail (201) and a camera mechanism (202); the protection module uploads data to a server; the monitoring control module (3) is connected to the server through a network and receives data uploaded by the protection module; the monitoring control module (3) comprises a current monitoring control unit (301) and a temperature monitoring control unit (302); the patrol monitoring mechanism (2) is controlled by the current monitoring control unit (301) and the temperature monitoring control unit (302) to implement a first adjustment patrol plan and a second adjustment patrol plan; The current monitoring control unit (301) comprises a first processing unit (3011) and a second processing unit (3012); The current monitoring control unit (301) is used to obtain the zero-sequence current Ix and the detection current of all switch cabinets, perform mean calculation on the detection current to obtain the average detection current Ia, determine whether the zero-sequence current Ix is 0, and control the first processing unit (3011) to implement the first processing scheme and the second processing unit (3012) to implement the second processing scheme according to whether the zero-sequence current Ix is equal to 0 or not equal to 0. The first processing scheme is specifically: Implementing the first determination method on all detection currents; The first judgment method is specifically: if the detection current belongs to [Ia-I1, Ia+I1] during the detection period, then the detection current is judged to be normal; I1 is the conventional current change value; If the detection current is greater than Ia+I1 during the detection period, the detection current of the switch cabinet is marked as a slightly abnormal detection current; Determine whether the slight abnormality detection current is less than Ia+I2; I2 is the short-circuit current change value; If the slightly abnormal detection current is not less than Ia+I2, it is judged that a short circuit has occurred, a tripping operation is implemented and an alarm is given; If the mild abnormality detection current is less than Ia+I2, the mild abnormality detection current is marked as the first moderate abnormality detection current and a high-power device is connected; The second processing scheme is specifically as follows: Determine whether the slightly abnormal detection current is increasing in the next detection period by using a second determination method on the detection current; The second judgment method is specifically as follows: Determine whether the slight abnormal detection current is greater than Ia+I3 in the next detection period; I3 is the change value of the ground fault current; If the slight abnormal detection current is greater than Ia+I3, it is determined that the switch cabinet corresponding to the slight abnormal detection current has a grounding fault; The patrol monitoring mechanism (2) is provided with a recording waiting time for recording data of the display screen (101) and the signal light (102) on the main body of the electronic switch cabinet; during the recording waiting time of the patrol monitoring mechanism (2), the current slight abnormality detection current is obtained according to a collection cycle of 100 ms, a current change curve is drawn according to a first two-dimensional coordinate system formed by the slight abnormality detection current and the timestamp, the current change curve is segmented at the inflection point to obtain a current segmented change curve, the absolute value of the slope of each segment of the curve is obtained, the segmented curve with the largest absolute slope value and the segmented curve with the smallest absolute slope value are eliminated, the maximum value and the minimum value of the slight abnormality detection current on the segmented curve are median-calculated to obtain the segmented curve median detection current, and the current standard current curve is drawn according to the two-dimensional coordinates formed by the median detection current and the timestamp; wherein the abscissa of the first two-dimensional coordinate system is the timestamp, and the ordinate is the value of the slight abnormality detection current; The area enclosed by the segmented current change curve drawn in the next detection period and the standard current curve drawn in the previous detection period is calculated to obtain the current change monitoring value A; Perform data analysis on the current change monitoring value A. If the change monitoring value A is greater than 0, it is determined that the mild abnormal detection current is on an upward trend, the mild abnormal detection current is marked as a severe abnormal detection current, and the corresponding switch cabinet load is determined to be unbalanced, and an inspection is notified; If the change monitoring value A is not greater than 0, the third judgment method is used to determine whether the slightly abnormal detection current is in a maintained state in the next detection period.

2. A switch cabinet monitoring and protection device according to claim 1, characterized in that: The third judgment method is specifically: Obtain the slope of each current curve of the segmented current change curve drawn during the current detection period, obtain the segmented current change rate B by calculating the absolute value of the slope, and perform data analysis on the segmented current change rate B; If the current change rate B of any segment is not greater than 0.2, it is determined that the mild abnormal detection current is in a maintained state in the next detection period, and the mild abnormal detection current is marked as the first moderate abnormal current; If there is a segmented current change rate B greater than 0.2, the mild abnormal detection current is judged to be fluctuating and is marked as the second moderate abnormal detection current; it is judged that the load in the switch cabinet marked as the moderate abnormal detection current is unbalanced and voltage fluctuations occur.

3. A switch cabinet monitoring and protection device according to claim 2, characterized in that: The first adjustment tour plan is specifically as follows: Add a circuit parameter L to the first moderate abnormality detection current, add a circuit parameter M to the second moderate abnormality detection current, and add a circuit parameter N to the severe abnormality detection current; wherein, 1 <L<M<N; Generate the corresponding path monitoring value y according to the detection current. When the detection current is normal, y is equal to 0; when the detection current is slightly abnormal, y is equal to 1; when the detection current is the first moderate abnormality or the second moderate abnormality, y is set to L and M respectively; when the detection current is severely abnormal, y is equal to N; Draw a second two-dimensional coordinate system based on the two-dimensional coordinates formed by the switch cabinet number j and the path monitoring value y, filter the area where y is equal to 0, divide the continuous path monitoring values ​​y into the same monitoring area and count the total number of path monitoring values ​​in the same monitoring area; divide the discontinuous path monitoring values ​​y into different monitoring areas, count the areas of all monitoring areas and number them to obtain the first circuit area monitoring value Si, where S is the area of ​​the monitoring area, i is the monitoring area number, i is a positive integer and i is less than the total number of switch cabinets n; If the total number of path monitoring values ​​in the monitoring area is greater than 1, the first circuit area monitoring value Si is obtained by multiplying the path monitoring value y of the same monitoring area; if the total number of path monitoring values ​​is equal to 1, the first circuit area monitoring value Si of the monitoring area is equal to the path monitoring value y; According to the formula The first repeated patrol time t1i of the next patrol to the monitoring area is calculated; T is the standard patrol cycle.

4. A switch cabinet monitoring and protection device according to claim 3, characterized in that: The temperature monitoring control unit (302) is used to obtain the detection temperatures of several switch cabinets in the monitoring area in the first detection scheme, obtain the highest temperature among the several detection temperatures in the same monitoring area through a linear search algorithm and set it as the detection temperature Ti of the monitoring area; The second adjustment tour plan is as follows: By formula The second repetition time t2i is calculated; k1 is the first reduction coefficient.

5. A switch cabinet monitoring and protection device according to claim 4, characterized in that: The first repetitive tour time t1i and the calculated second repetitive tour time t2i are processed by formula. Specifically, the formula The average repeated patrol time ta is calculated, and the patrol monitoring mechanism (2) is controlled to patrol the monitoring area according to the average repeated patrol time ta; w1 and w2 are the weight coefficients of the first repeated patrol time t1i and the second repeated patrol time t2i, respectively. <w2; If the average repeated patrol times of different monitoring areas conflict, the monitoring area with the smallest average repeated patrol time will be selected for patrol.

6. A switch cabinet monitoring and protection device, using the method for using the switch cabinet monitoring and protection device as described in claim 1, characterized in that: The following steps are involved: S1. Installation inspection: Ensure that the thermal imager’s shooting range covers the main heat-generating parts of the switch cabinet body (1); S2. Setting the patrol mode: adjusting the initial moving speed of the patrol monitoring mechanism (2) to a suitable value, so as to ensure that the scene images captured by the patrol monitoring mechanism (2) can be clearly obtained within a certain adjustment range.

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