An intelligent operation and maintenance system for low-voltage power station switch cabinets

Abstract

The present invention discloses an intelligent operation and maintenance system for a low-voltage plant switch cabinet, and relates to the field of switch cabinet operation and maintenance technology. The intelligent operation and maintenance system for a low-voltage plant switch cabinet includes: a data acquisition module; an alarm information push module; a remote monitoring and control module; and a switch device detection module. The present invention obtains the switch status data and the pile head temperature data of the low-voltage plant switch cabinet, and then obtains the switch abnormality data of the low-voltage plant switch cabinet within a preset time period and issues an audible and visual alarm, while performing a terminal display and performing switch device detection on the switch device within a preset period to obtain the wear parameters, and finally monitors the triggering of the circuit breaker of the switch device in real time during the switch device detection process and performs current protection tripping, thereby achieving an improvement in the real-time acquisition of maintenance suggestions in the switch device detection, and solves the problem of low real-time acquisition of switch device maintenance suggestions during the operation and maintenance of the low-voltage plant switch cabinet in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of switch cabinet operation and maintenance, and in particular to an intelligent operation and maintenance system for a low-voltage power station switch cabinet. Background Art

[0002] With the rapid development of the electric power industry and the continuous deepening of smart grid construction, low-voltage plant switchgear is an indispensable and important part of the power system. Its operation stability and safety are directly related to the reliable operation of the entire power system. Secondly, with the continuous development of technologies such as the Internet of Things, big data and artificial intelligence, the intelligent operation and maintenance system of low-voltage plant switchgear will be more perfect and intelligent, providing more powerful support for the stable operation of the power system. However, the traditional operation and maintenance methods of low-voltage switchgear mainly rely on manual inspection and manual operation, which have problems such as low efficiency, delayed information transmission, and great safety hazards. In addition, due to the existence of human factors, manual operation may also cause misoperation, posing a threat to the safety of power equipment and personnel. Therefore, it is particularly important to develop an efficient and intelligent low-voltage plant switchgear operation and maintenance system.

[0003] The existing low-voltage plant switchgear intelligent operation and maintenance system uses sensors to monitor the voltage, current and temperature parameters inside the switchgear in real time, identifies abnormal fluctuations in the switchgear during operation and issues early warnings, and then takes corresponding measures through remote control technology to handle the situation, thus realizing real-time monitoring and fault diagnosis of low-voltage plant switchgear.

[0004] For example, the online detection device for the opening and closing cycle of the circuit breaker of the power switch cabinet, which is announced by the invention patent with announcement number: CN102590739B, includes: connecting the primary side of the Hall current sensor in series in the opening coil loop in the circuit breaker opening and closing control circuit; obtaining the high-frequency signal when the circuit breaker opening coil is energized, and superimposing the high-frequency signal on one end of the moving and static contacts in the main circuit of the circuit breaker; decoupling the high-frequency signal from the high-voltage power frequency signal at the other end of the moving and static contacts in the main circuit of the circuit breaker and transmitting it to the microprocessor, so as to obtain the opening cycle and opening asynchronism of the circuit breaker.

[0005] For example, the substation high-voltage switchgear status diagnosis device based on real-time temperature monitoring disclosed in the patent application with publication number: CN115792449A includes: collecting temperature monitoring data of the environment inside the high-voltage switchgear and temperature monitoring data of each measuring point; analyzing the received temperature monitoring data to evaluate the status of each measuring point in each high-voltage switchgear in the substation; performing multi-dimensional correlation analysis on the temperature monitoring data of each measuring point in the high-voltage switchgear, ambient temperature monitoring data, switchgear current, switchgear operating years, switchgear model, switchgear voltage level, and switchgear defect data; dividing the switchgear status into normal status, attention status, abnormal status, and severe status according to the correlation analysis results, and proposing corresponding switchgear temperature monitoring strategies, operation and maintenance strategies, and overhaul strategies, which are then sent to the switchgear operation and maintenance personnel and the temperature monitoring data preprocessing unit.

[0006] However, in the process of implementing the technical solution of the invention in the embodiments of the present application, the present application found that the above technology has at least the following technical problems:

[0007] In the prior art, due to the increasing complexity and diversity of operation and maintenance data, the response speed of sensors in low-voltage plant switchgear during operation is slow, resulting in the operation and maintenance system being unable to capture the trigger signal of the current protection tripping in time and respond quickly, which in turn leads to reduced maintenance efficiency of the switchgear. There is a problem of low real-time acquisition of switch equipment maintenance suggestions during the operation and maintenance of the low-voltage plant switchgear. Summary of the invention

[0008] The embodiment of the present application solves the problem of low real-time acquisition of switchgear maintenance suggestions during the operation and maintenance of low-voltage power station switchgear in the prior art by providing an intelligent operation and maintenance system for low-voltage power station switchgear, thereby improving the real-time acquisition of maintenance suggestions during switchgear detection.

[0009] The embodiment of the present application provides an intelligent operation and maintenance system for a low-voltage plant switch cabinet, including: a data acquisition module, an alarm information push module, a remote monitoring and control module, and a switch equipment detection module; wherein the data acquisition module is used to obtain the switch status data of the low-voltage plant switch cabinet through a switch link, and at the same time obtain the pile head temperature data of the low-voltage plant switch cabinet through a temperature link, the switch link communicates with the switch equipment in the low-voltage plant switch cabinet, the switch status data includes the switch current and the switch load, and the pile head temperature data includes the copper busbar temperature, the upper pile head temperature, and the lower pile head temperature; the alarm information push module is used to obtain the switch abnormality data of the low-voltage plant switch cabinet within a preset time period and issue an audible and visual alarm, the switch abnormality data includes overcurrent, overload and temperature warning data, the temperature warning data is used to measure the temperature abnormality degree of the pile head temperature data within a preset time period, and the audible and visual alarm is used to convert the switch abnormality data into A warning reminder is issued in the form of sound and light and is pushed to the cloud server of the low-voltage plant switch cabinet as an alarm message; the remote monitoring and control module is used to receive the alarm information pushed by the alarm information push module and display it on the terminal, and the terminal user controls the switch to open and close according to the control instructions displayed on the terminal. The terminal display includes a local screen display and a remote background display, and the control instruction is the content of the alarm message; the switch device detection module is used to communicate with the switch device and monitor in real time the triggering of the circuit breaker of the switch device during the separate control process, and at the same time, the switch device is detected within a preset period to obtain the loss coefficient. The switch device detection is used to check the operating status of the switch device within a preset period and generate corresponding maintenance suggestions. The operating status includes the total number of opening and closing times of the switch device, the wear of the switch contacts, and the current protection tripping status. The loss coefficient includes the number of switch opening and closing times and the degree of wear of the switch contacts.

[0010] Furthermore, the acquisition of switch abnormality data of the low-voltage plant switch cabinet within a preset time period also includes real-time recording of the operation timestamp of the switch device to obtain an operation time score, and the operation timestamp includes an operation current timestamp and an operation load timestamp; the operation current timestamp includes a first current timestamp and a second current timestamp, the first current timestamp indicates the difference between the time when the switch device generates the switch current when it starts to operate within the preset time period and the time when the operation signal is received, and the second current timestamp indicates the difference between the time when the switch current reaches the overcurrent during the operation of the switch device within the preset time period and the time when the switch current is generated when the operation just begins; the operation load timestamp includes a first load timestamp and a second load timestamp, the first load timestamp indicates the difference between the time when the switch load generates the switch load when the switch device starts to operate within the preset time period and the time when the operation signal is received, and the second load timestamp indicates the difference between the time when the switch load reaches the overload during the operation of the switch device within the preset time period and the time when the switch load is generated when the operation just begins; the operation time score is used to measure the efficiency of the sound and light alarm during the operation of the switch device within the preset time period.

[0011] Furthermore, the running time score is calculated by the following formula:

[0012]

[0013] Where n is the number of the preset time period, n = 1, 2, ..., N, N is the total number of preset time periods, e is a natural constant, YUN n It indicates the operating time fraction of the switchgear in the low-voltage plant switchgear in the nth preset time period. Indicates the first current timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, Indicates the reference first current timestamp, Indicates the second current timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, represents a reference second current timestamp within a preset time period, Indicates the first load timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, Indicates the reference first load timestamp, Indicates the second load timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, Indicates the reference second load timestamp.

[0014] Furthermore, the specific steps for obtaining the temperature warning data are: real-time recording of the temperature timestamp when the pile head temperature data reaches a preset temperature, the preset temperature includes a preset copper busbar temperature, a preset upper pile head temperature and a preset lower pile head temperature, and the temperature timestamp includes a first temperature timestamp, a second temperature timestamp and a third temperature timestamp; real-time monitoring of the change of the pile head temperature data within a preset time period by a temperature sensor and obtaining the pile head temperature loss value, and combining the obtained temperature timestamp and the operating time score to obtain the temperature warning data, the pile head temperature loss value includes the copper busbar temperature loss value, the upper pile head temperature loss value and the lower pile head temperature loss value.

[0015] Furthermore, the switching device detection module includes a real-time monitoring unit and a current protection tripping unit; the real-time monitoring unit is used to monitor the operating status of the low-voltage power line under a preset switching state during the switching device detection process in real time and obtain key operating parameters through sensors; the current protection tripping unit is used to receive the acquired key operating parameters, and trigger the current protection tripping mechanism of the current protection tripping unit when the key operating parameters are equal to the corresponding rated parameters, and the rated parameters include rated current, rated voltage and rated temperature.

[0016] Furthermore, the current protection tripping mechanism of the triggering current protection tripping unit also includes obtaining a current protection tripping triggering coefficient according to key operating parameters and corresponding rated parameters as well as detection current and rated detection current, wherein the current protection tripping triggering coefficient is obtained by detecting a current protection triggering coefficient, a voltage protection triggering coefficient and a temperature protection triggering coefficient, and the current protection tripping triggering coefficient is calculated by the following formula:

[0017]

[0018] Wherein, y is the serial number of the low-voltage power line, y=1,2,...,Y, Y is the total number of low-voltage power lines, m is the number of switch opening and closing operations, m=1,2,...,M, M is the preset number of switch opening and closing operations, e is a natural constant, It represents the detection current protection trigger coefficient of the y-th low-voltage power line during the m-th switch opening and closing operation. It represents the voltage protection triggering coefficient of the y-th low-voltage power line during the m-th switch opening and closing operation. It represents the temperature protection triggering coefficient of the y-th low-voltage power line during the m-th switch opening and closing operation.

[0019] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0020] 1. By obtaining the switch status data and pile head temperature data of the low-voltage plant switch cabinet, and then obtaining the switch abnormality data of the low-voltage plant switch cabinet within a preset time period and issuing an audible and visual alarm, the terminal display is performed at the same time and the switch equipment is tested within a preset period to obtain the wear parameters. Finally, the triggering of the circuit breaker of the switch equipment during the switch equipment detection process is monitored in real time and the current protection tripping is performed, thereby achieving the improvement of the accuracy and efficiency of the current protection tripping triggering, and then achieving the improvement of the real-time acquisition of maintenance suggestions in the switch equipment detection, which effectively solves the problem of low real-time acquisition of switch equipment maintenance suggestions during the operation and maintenance of the low-voltage plant switch cabinet in the existing technology.

[0021] 2. The circuit breaker in the switchgear monitors the operating status of the switchgear in real time according to the alarm information after level classification and the preset detection parameters, and monitors the current changes during the operation of the switchgear in real time. When the current during the operation of the switchgear is equal to the preset detection current value, the current protection of the circuit breaker is triggered to trip and fault feedback is performed, thereby improving the accuracy of fault feedback, and then improving the detection accuracy and reliability of the switchgear.

[0022] 3. By real-time monitoring the operating status of the low-voltage power line in the preset switch state during the switch equipment detection process and obtaining key operating parameters through sensors, the current protection tripping mechanism of the current protection tripping unit is triggered when the key operating parameters are equal to the corresponding rated parameters, thereby improving the accuracy of obtaining key operating parameters, and further improving the real-time response accuracy of the current protection tripping mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of an intelligent operation and maintenance system for a low-voltage power station switch cabinet provided in an embodiment of the present application;

[0024] Figure 2 A three-dimensional coordinate analysis diagram of the running time score provided in the embodiment of the present application;

[0025] Figure 3 A flow chart for obtaining temperature warning data provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] The embodiment of the present application solves the problem of low real-time acquisition of switch equipment maintenance suggestions during the operation and maintenance of low-voltage plant switch cabinets in the prior art by providing an intelligent operation and maintenance system for low-voltage plant switch cabinets. The switch status data of the low-voltage plant switch cabinet is acquired according to the switch link through the data acquisition module, and the pile head temperature data of the low-voltage plant switch cabinet is acquired through the temperature link. At the same time, the abnormal switch data of the low-voltage plant switch cabinet within a preset time period is acquired through the alarm information push module and an audible and visual alarm is issued. Then, the alarm information pushed by the alarm information push module is received through the remote monitoring and control module and displayed on the terminal. Finally, the triggering status of the circuit breaker of the switch equipment during the switch equipment detection process is monitored in real time through the switch equipment detection module. At the same time, the switch equipment is detected on the switch equipment within a preset period to obtain the wear parameters, thereby improving the real-time acquisition of maintenance suggestions in the switch equipment detection.

[0027] The technical solution in the embodiment of the present application is to solve the problem of low real-time acquisition of switch equipment maintenance suggestions during the operation and maintenance of the above-mentioned low-voltage plant switch cabinet. The overall idea is as follows:

[0028] By acquiring the switch status data and pile head temperature data of the low-voltage plant switch cabinet, and then acquiring the switch abnormality data of the low-voltage plant switch cabinet within the preset time period and issuing an audible and visual alarm, the terminal display is performed at the same time and the switch equipment is tested on the switch equipment within the preset period to obtain the wear parameters. Finally, the triggering status of the circuit breaker of the switch equipment during the switch equipment detection process is monitored in real time and the current protection trip is performed, thereby achieving the effect of improving the real-time acquisition of maintenance suggestions in the switch equipment detection.

[0029] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figure 1As shown, it is a structural schematic diagram of a low-voltage plant switch cabinet intelligent operation and maintenance system provided by an embodiment of the present application. The low-voltage plant switch cabinet intelligent operation and maintenance system provided by an embodiment of the present application includes: a data acquisition module, an alarm information push module, a switch device detection module and a remote monitoring and control module; wherein the data acquisition module is used to obtain the switch status data of the low-voltage plant switch cabinet through a switch link, and at the same time obtain the pile head temperature data of the low-voltage plant switch cabinet through a temperature link. The switch link communicates with the switch device in the low-voltage plant switch cabinet, and the switch of the switch device is composed of an upper pile head and a lower pile head. The low-voltage plant switch cabinet is composed of an incoming line cabinet and a feeder cabinet. The feeder cabinet includes a frame feeder cabinet and a molded case feeder cabinet. The switch status data includes the switch current and the switch load. The temperature link communicates with the wireless temperature measurement receiver in the low-voltage plant switch cabinet. The pile head temperature data includes the copper busbar temperature, the upper pile head temperature and the lower pile head temperature. The copper busbar is connected to the upper and lower pile heads of the switch respectively; the alarm information push module is used to obtain the switch abnormality data of the low-voltage plant switch cabinet within the preset time period and issue an audible and visual alarm. The switch abnormality data includes overcurrent, overload and temperature warning data. Overcurrent indicates that the switch The current exceeds 90% of the rated current, and the overload indicates that the switch load exceeds 80% of the rated power. The temperature warning data is used to measure the temperature anomaly of the pile head temperature data within a preset time period. The sound and light alarm is used to issue a warning reminder of the switch abnormality data in the form of sound and light and push it as an alarm information to the cloud server of the low-voltage plant switch cabinet; the remote monitoring and control module is used to receive the alarm information pushed by the alarm information push module and display it on the terminal. At the same time, the terminal user controls the switch to open and close according to the control instructions displayed on the terminal. The terminal display includes a local screen display and a remote background display. The control instruction is the content of the alarm information; the switch device detection module is used to communicate with the switch device and monitor the triggering of the circuit breaker of the switch device in real time during the separate control process. At the same time, the switch device is detected within a preset period to obtain the loss coefficient. The switch device detection is used to check the operating status of the switch device within the preset period and generate corresponding maintenance suggestions. The operating status includes the total number of opening and closing times of the switch device, the wear of the switch contacts, and the current protection tripping. The loss coefficient includes the number of opening and closing times of the switch and the degree of wear of the switch contacts.

[0031] In this embodiment, the low-voltage plant switch cabinet includes an incoming line cabinet and a feeder cabinet. Here, only the simplest three-sided cabinet is taken as an example. Among them, the incoming line cabinet is mainly used to receive and distribute electric energy from the power grid. It is usually equipped with a circuit breaker and an isolating switch device to control the access and disconnection of the power supply. The incoming line cabinet is also equipped with measuring instruments such as a voltmeter and an ammeter to monitor the operating status of the power system; the feeder cabinet is also called a distribution cabinet, which is mainly used to distribute electric energy to various electrical equipment. The feeder cabinet is also equipped with a circuit breaker, an isolating switch device, and a measuring instrument. Through the control and protection functions of the feeder cabinet, the safe and reliable operation of the electrical equipment can be ensured; it should be noted that the feeder cabinet usually includes a frame feeder cabinet and a molded case feeder cabinet, as shown in Table 1, which is a comparative analysis table of the frame feeder cabinet and the molded case feeder cabinet:

[0032] Table 1 Comparative analysis of frame feeder cabinet and molded case feeder cabinet

[0033]

[0034] Specifically, the pile head temperature data is usually obtained by real-time measurement of the temperature sensor on the switch device, the switching current of the switch device is usually obtained by real-time measurement of the current sensor on the switch device, the switching voltage of the switch device is usually obtained by real-time measurement of the voltage sensor on the switch device, and the switch load represents the total power consumed by the electrical equipment in the switch circuit; after the switch abnormality data of the low-voltage plant switch cabinet within a preset time period is obtained, the non-numerical data in the switch abnormality data will be converted into numerical data and a switch abnormality signal (i.e., the switch abnormality data after numerical conversion) will be sent to the sound and light alarm in the switch device, and sound and light signals will be emitted at the same time to attract the attention of the operation and maintenance management personnel, and then the switch abnormality signal will be transmitted to the cloud server for storage, and the alarm information will be sent to the mobile device of the operation and maintenance management personnel in real time, and the operation and maintenance management personnel will quickly respond to the location of the sound and light alarm and take corresponding solutions, wherein the cloud server is usually connected to the sound and light alarm via Ethernet; when the detection current in the switch device reaches the rated detection current, the circuit breaker will sense this change and start the protection mechanism, which can effectively prevent the damage to the line and equipment caused by excessive current.

[0035] Specifically, control instructions are executed according to the type, occurrence time and specific location of the alarm information, and the opening and closing control of the switch device is realized through the relays and actuators in the low-voltage power line. Among them, the control instructions usually include immediately disconnecting the faulty equipment, adjusting the equipment parameters and restoring normal operation. They are usually used in monitoring equipment in power production lines to control the opening and closing of the switch device and control the production process. It should be noted that during the inspection of the switch device, the wear detection of the switch contacts usually requires a power outage. For tools that are difficult to use directly to measure the friction degree of the contact gap, ultrasonic detection in non-destructive testing technology can be used to measure the friction degree of the switch contact gap. In addition, as the working conditions of the switch deteriorate over the years, the frequency of switch device inspection will increase, and timely updating of maintenance recommendations will help to fully and clearly grasp the operating status of the switch device, improve the safe and stable operation of the switch device, and achieve an improvement in the accuracy of obtaining the current protection tripping trigger signal during the operation and maintenance of the low-voltage plant switch cabinet.

[0036] Furthermore, the switch abnormality data of the low-voltage plant switch cabinet within a preset time period is obtained, and then the operation timestamp of the switch device is recorded in real time to obtain the operation time score, the operation timestamp includes an operation current timestamp and an operation load timestamp; the operation current timestamp includes a first current timestamp and a second current timestamp, the first current timestamp indicates the difference between the time when the switch device generates the switch current when it starts to operate within the preset time period and the time when the operation signal is received, and the second current timestamp indicates the difference between the time when the switch current reaches the overcurrent during the operation of the switch device within the preset time period and the time when the switch current is generated when the operation starts; the operation load timestamp includes a first load timestamp and a second load timestamp, the first load timestamp indicates the difference between the time when the switch load is generated when the switch device starts to operate within the preset time period and the time when the operation signal is received, and the second load timestamp indicates the difference between the time when the switch load reaches the overload during the operation of the switch device within the preset time period and the time when the switch load is generated when the operation starts; the operation time score is used to measure the sound and light alarm efficiency of the switch device during the operation of the preset time period, and the sound and light alarm efficiency indicates the speed at which the switch state data reaches the switch abnormality data.

[0037] In this embodiment, in the actual application scenario of the low-voltage plant switch cabinet, the cumulative operating time of the switch device within the preset time period is usually recorded by a real-time clock, and the cumulative operating time is divided by the preset time period to obtain the operating time score, wherein the cumulative operating time is the sum of the second current timestamp and the second load timestamp, and the preset time period is the sum of the first current timestamp and the first load timestamp. However, it should be noted that the cumulative operating time is the total time that the switch device is in the actual operating state. Therefore, in the real-time recording process, it is also necessary to exclude the time when the switch device is not in operation within the preset time period, resulting in low accuracy in obtaining the cumulative operating time, thereby reducing the efficiency of obtaining the operating time score. Therefore, the operating time score is obtained through the operating timestamp of the above-mentioned switch device, thereby achieving more accurate acquisition of the operating score time score.

[0038] Furthermore, the running time score is calculated by the following formula:

[0039]

[0040] Where n is the number of the preset time period, n = 1, 2, ..., N, N is the total number of preset time periods, e is a natural constant, YUN n It indicates the operating time fraction of the switchgear in the low-voltage plant switchgear in the nth preset time period. Indicates the first current timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, Indicates the reference first current timestamp, Indicates the second current timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, represents a reference second current timestamp within a preset time period, Indicates the first load timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, Indicates the reference first load timestamp, Indicates the second load timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, Indicates the reference second load timestamp.

[0041] In this embodiment, in order to simplify the analysis, we define In the formula, A1 n Indicates the first timestamp coefficient of the switchgear in the low-voltage plant switch cabinet in the nth preset time period, B1 n It represents the second timestamp coefficient of the switchgear in the low-voltage plant switch cabinet in the nth preset time period. The simplified calculation formula of the operating time fraction is: Among them, the reference to the first current timestamp is usually represented by the sum and average of the historical current response timestamps in the preset database, the reference to the second current timestamp is usually represented by the sum and average of the historical current operation timestamps in the preset database, the reference to the first load timestamp is usually represented by the sum and average of the historical load response timestamps in the preset database, and the reference to the second load timestamp is usually represented by the sum and average of the historical load operation timestamps in the preset database.

[0042] Among them, the historical current response timestamp is usually the difference between the time when the switching current is generated when the switching device starts to operate within the historical time period and the time when the operation signal is received; the historical current operation timestamp is usually the difference between the time when the switching current reaches the overcurrent during the operation of the switching device within the historical time period and the time when the switching current is generated when the operation starts; the historical load response timestamp is usually the difference between the time when the switching load is generated when the switching device starts to operate within the historical time period and the time when the operation signal is received; the historical load operation timestamp is usually the difference between the time when the switching load reaches the overload during the operation of the switching device within the historical time period and the time when the switching load is generated when the operation starts.

[0043] like Figure 2 As shown, it is a three-dimensional coordinate analysis diagram of the operating time score provided by the embodiment of the present application. It can be seen from the figure that the operating time score decreases as the first timestamp coefficient and the second timestamp coefficient increase. It should be understood that the algorithm of this embodiment combines the first timestamp coefficient and the second timestamp coefficient factors, and comprehensively analyzes to obtain the operating time score. The first load timestamp and the first current timestamp in this formula not only unilaterally affect the value of the operating time score, but also affect each other. In practical applications, current and load are usually interrelated. For example, an increase in load will cause an increase in current, resulting in an extension of the first current timestamp within a preset time period, and the change in current will also affect the distribution of load, thereby causing the first load timestamp within the preset time period to be extended. By considering the mutual influence between the two independent variables (the first load timestamp and the first current timestamp) and thus jointly affecting the value of the dependent variable (operating time score), the accuracy of the operating time score is improved, and then the accuracy of the current protection tripping trigger signal acquisition of the low-voltage plant switch cabinet during the operation and maintenance process is improved, which effectively solves the problem of low real-time acquisition of switch equipment maintenance suggestions during the operation and maintenance of the low-voltage plant switch cabinet in the prior art.

[0044] Further, such as Figure 3As shown, it is a flow chart of the steps for obtaining the temperature warning data provided in the embodiment of the present application, and the specific steps for obtaining the temperature warning data are: real-time recording of the temperature timestamp when the pile head temperature data reaches the preset temperature, the preset temperature includes the preset copper busbar temperature, the preset upper pile head temperature and the preset lower pile head temperature, the temperature timestamp includes the first temperature timestamp, the second temperature timestamp and the third temperature timestamp, the first temperature timestamp is the timestamp when the copper busbar temperature reaches the preset copper busbar temperature during the operation of the switch device within the preset time period, the second temperature timestamp is the timestamp when the upper pile head temperature reaches the preset upper pile head temperature during the operation of the switch device within the preset time period, and the third temperature timestamp is the timestamp when the lower pile head temperature reaches the preset lower pile head temperature during the operation of the switch device within the preset time period. Timestamp of the pile head temperature; use a temperature sensor to monitor the changes in the pile head temperature data within a preset time period in real time and obtain the pile head temperature loss value, and at the same time combine the obtained temperature timestamp and operating time score to obtain temperature warning data. The pile head temperature loss value includes the copper busbar temperature loss value, the upper pile head temperature loss value and the lower pile head temperature loss value. The copper busbar temperature loss value is the temperature difference between the copper busbar temperature and the preset copper busbar temperature before the switch device is operated within the preset time period. The upper pile head temperature loss value is the loss temperature when the upper pile head temperature reaches the preset upper pile head temperature during the operation of the switch device within the preset time period. The lower pile head temperature loss value is the loss temperature when the lower pile head temperature reaches the preset lower pile head temperature during the operation of the switch device within the preset time period.

[0045] In this embodiment, the preset copper busbar temperature is usually represented by the result of summing and averaging the historical copper busbar temperatures in the preset database, the preset upper pile head temperature is usually represented by the result of summing and averaging the historical pile head temperatures in the preset database, and the preset lower pile head temperature is usually represented by the result of summing and averaging the historical lower pile head temperatures in the preset database; the first temperature timestamp represents the time difference between the time point when the copper busbar temperature of the switch device starts to operate and the time point when the preset copper busbar temperature is reached, and the second temperature timestamp represents the time difference between the time point when the upper pile head temperature of the switch device starts to operate and the time point when the preset upper pile head temperature is reached. Time difference, the third temperature timestamp indicates the time difference between the time point when the lower pile head temperature of the switch device starts to operate and the time point when the preset lower pile head temperature is reached; the copper busbar temperature loss value indicates the temperature difference between the copper busbar temperature of the switch device before operation within the preset time period and the preset copper busbar temperature; the upper pile head temperature loss value indicates the temperature difference between the upper pile head temperature of the switch device before operation within the preset time period and the preset upper pile head temperature; the lower pile head temperature loss value indicates the temperature difference between the lower pile head temperature of the switch device before operation within the preset time period and the preset lower pile head temperature; more accurate acquisition of temperature warning data is achieved.

[0046] Specifically, the expression of temperature warning data is:

[0047]

[0048] Where WEN n Indicates the temperature warning data of the switchgear in the low-voltage plant switch cabinet in the nth preset time period, YUN 0 represents the reference running time fraction, α 1 Represents the weight factor of the copper busbar temperature loss rate, It indicates the copper bar temperature loss value of the switchgear in the low-voltage power station switch cabinet in the nth preset time period. Indicates the first temperature timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, α 2 represents the weight factor of the upper pile head temperature loss rate, It indicates the upper pile temperature loss value of the switchgear in the low-voltage power station switch cabinet in the nth preset time period. Indicates the second temperature timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, α 3 represents the weight factor of the temperature loss rate of the lower pile head, It indicates the temperature loss value of the lower pile head of the switchgear in the low-voltage power station switch cabinet within the nth preset time period. Represents the third temperature timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period.

[0049] Among them, the copper busbar temperature consumption rate weight factor, the upper pile head temperature consumption rate weight factor and the lower pile head temperature consumption rate weight factor are obtained from the preset database, the copper busbar temperature consumption rate weight factor is used to measure the proportion of the copper busbar temperature consumption rate relative to the temperature warning data, the copper busbar temperature consumption rate represents the ratio of the copper busbar temperature consumption value to the first temperature timestamp, the upper pile head temperature consumption rate represents the ratio of the upper pile head temperature consumption value to the second temperature timestamp, the upper pile head temperature consumption rate weight factor is used to measure the proportion of the upper pile head temperature consumption rate relative to the temperature warning data, the lower pile head temperature consumption rate represents the ratio of the lower pile head temperature consumption value to the third temperature timestamp, and the lower pile head temperature consumption rate weight factor is used to measure the proportion of the lower pile head temperature consumption rate relative to the temperature warning data.

[0050] Specifically, the algorithm of this embodiment combines the pile head temperature loss value, temperature timestamp and operation time score factors, and comprehensively analyzes to obtain temperature warning data. It should be noted that the operation time score and pile head temperature loss value (copper busbar temperature loss value, upper pile head temperature loss value and lower pile head temperature loss value) in this formula not only unilaterally affect the value of temperature warning data, for example, the operation time score also indirectly affects the value of copper busbar temperature loss value. Suppose there is a low-voltage switch cabinet, which contains conductive components such as copper busbars. After long-term high-load operation, the temperature of the copper busbar will rise, resulting in an increase in the temperature loss value. At this time, the operation time score will also increase accordingly, because it reflects the high load state of the equipment for a long time. When the operation time score decreases (such as the equipment is in a low load or idle state), the temperature loss value of the copper busbar will also decrease relatively; when the operation time score increases (such as the equipment continues to run at a high load), the temperature loss value of the copper busbar will increase significantly, because the high load causes more heat generation and temperature rise. In summary, the operating time fraction indirectly affects the value of the copper busbar temperature loss by affecting the load state and temperature distribution of the equipment.

[0051] It should be understood that the copper bar temperature loss rate weight factor is obtained from a preset database. In a specific embodiment, a mapping set of the copper bar temperature loss rate and its corresponding weight factor is constructed based on the relationship between the historical copper bar temperature loss rate and the temperature warning data in the preset database, and the real-time copper bar temperature loss rate is input into the mapping set to obtain the corresponding copper bar temperature loss rate weight factor, wherein the historical copper bar temperature loss rate is generally the ratio between the copper bar temperature before the switch device is operated in the historical time period and the preset copper bar temperature.

[0052] The upper pile head temperature loss rate weight factor is obtained from a preset database. In a specific embodiment, a mapping set of the upper pile head temperature loss rate and its corresponding weight factor is constructed based on the relationship between the historical pile head temperature loss rate and the temperature warning data in the preset database, and the real-time upper pile head temperature loss rate is input into the mapping set to obtain the corresponding upper pile head temperature loss rate weight factor, wherein the historical pile head temperature loss rate is generally the ratio between the upper pile head temperature before the switchgear is operated in the historical time period and the preset upper pile head temperature.

[0053] The weight factor of the lower pile head temperature loss rate is obtained from a preset database. In a specific embodiment, a mapping set of the lower pile head temperature loss rate and its corresponding weight factor is constructed according to the relationship between the historical lower pile head temperature loss rate and the temperature warning data in the preset database, and the real-time lower pile head temperature loss rate is input into the mapping set to obtain the corresponding lower pile head temperature loss rate weight factor, wherein the historical lower pile head temperature loss rate is usually the ratio between the lower pile head temperature before the switchgear is operated in the historical time period and the preset lower pile head temperature, thereby achieving more accurate acquisition of temperature warning data, and thus achieving improved accuracy in acquiring current protection tripping trigger signals during the operation and maintenance of low-voltage plant and station switchgear, and effectively solving the problem of low real-time acquisition of switchgear maintenance suggestions during the operation and maintenance of low-voltage plant and station switchgear in the prior art.

[0054] Furthermore, the alarm information of the alarm information push module is received, and then the alarm information is classified into levels, including severe level, warning level and general level. The severe level indicates the alarm level when the copper busbar temperature of the switch equipment exceeds 80°C during the operation of the low-voltage power station cabinet. The warning level indicates the alarm level when the switching current of the switch equipment reaches overcurrent during the operation of the low-voltage power station cabinet. The general level indicates the alarm level when the switch state of the switch equipment changes during the operation of the low-voltage power station cabinet, and the switch state change includes from opening to closing and from closing to opening.

[0055] In this embodiment, the temperature of the copper bar during the operation of the switch device is usually monitored in real time through a temperature sensor. When the temperature of the copper bar exceeds the preheating overheat value of the switch device during the switch device detection process, it indicates that the switch device is at risk of overheating. The preset overheat value of the switch device during the switch device detection process is generally 80°C, which is usually represented by the sum and average of the historical highest temperatures of the copper bar in the preset database. At this time, the temperature of the copper bar is at a serious level and power needs to be cut off in time. By real-time monitoring the alarm level of the switch device during normal operation, the safe operation of the switch device can be ensured, thereby improving the safety and stability of the operation of the switch device.

[0056] Furthermore, the specific steps of performing switch equipment detection on the switch equipment within a preset period are: the circuit breaker in the switch equipment monitors the operating status of the switch equipment in real time according to the alarm information after level classification and the preset detection parameters, and the preset detection parameters include the preset operation time of the switch opening and closing and the preset number of switch opening and closing operations; the current changes during the operation of the switch equipment are monitored in real time, and when the current during the operation of the switch equipment is equal to the preset detection current value, the current protection of the circuit breaker is triggered to trip and fault feedback is performed, and the preset detection current value is represented by the result of summing and averaging the historical detection current data in the preset database.

[0057] In this embodiment, the preset switch opening and closing time is usually represented by the result of summing and averaging the historical switch opening and closing times in the preset database, and the preset number of switch opening and closing times is usually represented by the result of summing and averaging the number of switch opening and closing times of the switching device in the historical time period in the preset database. When the current during the operation of the switching device is equal to the preset detection current value, the current protection of the circuit breaker is triggered to trip, automatically cut off the circuit and send a fault signal (such as the location and time of the overcurrent), which is beneficial to prevent overheating of the equipment due to excessive current. Among them, the preset detection current is usually represented by the result of summing and averaging the historical detection currents in the preset database, thereby improving the detection accuracy and safety of the switching device.

[0058] Furthermore, the switchgear is inspected within a preset period, and then the switchgear inspection index is obtained according to the acquired loss parameters. The switchgear inspection index is used to measure the performance stability of the switchgear during the switchgear inspection process. The specific acquisition process is: real-time measurement of the loop resistance value and power loss in the low-voltage power line, and acquisition of the active power loss of the transformer in the low-voltage power line when no-load. The low-voltage power line is a power line distributed in the low-voltage plant switch cabinet and does not cross each other. The line resistance loss is the product of the square of the current value and the resistance value. The active power loss is used to measure the energy efficiency level of the transformer under no-load state; the initial friction force of the switch contact of the switchgear before the switchgear inspection and the dynamic friction force during the switchgear inspection are measured in real time by a friction sensor to obtain the degree of wear of the switch contact. The degree of wear of the switch contact represents the ratio of the dynamic friction force of the switch contact to the initial friction force; the switchgear inspection index is obtained by combining the acquired line resistance loss, active power loss and degree of wear of the switch contact.

[0059] Furthermore, the switchgear detection index is calculated by the following formula:

[0060]

[0061] Where n is the number of the preset time period, n = 1, 2, ..., N, N is the total number of preset time periods, m is the number of switch opening and closing operations, m = 1, 2, ..., M, M is the preset number of switch opening and closing operations, y is the number of the low-voltage power line, y = 1, 2, ..., Y, Y is the total number of low-voltage power lines, e is a natural constant, CE n.m Indicates the switch device detection index of the mth switch opening and closing operation of the switch device within the nth preset time period, YUN n Indicates the operating time fraction of the switchgear in the low-voltage plant switchgear during the nth preset time period, WEN n Indicates the temperature warning data of the switchgear in the low-voltage plant switch cabinet in the nth preset time period. It represents the line resistance loss of the yth low-voltage power line during the mth switch opening and closing operation within the nth preset time period, K represents the active power loss of the yth low-voltage power line at the mth switch opening and closing operation within the nth preset time period, n.m Indicates the degree of wear of the switch contacts of the switching device during the mth switching operation within the nth preset time period.

[0062] In this embodiment, in order to simplify the analysis, we define In the formula, GH n.m It represents the line loss coefficient of the switchgear at the mth switch opening and closing operation within the nth preset time period. The simplified calculation formula of the switchgear detection index is: The statistical table of changes in switchgear detection indicators is shown in Table 2:

[0063] Table 2 Statistics of changes in switchgear detection indicators

[0064]

[0065] It should be understood that the algorithm of this embodiment combines the operating time score, temperature warning data, line loss coefficient and switch contact wear degree factors to obtain the switch detection index through comprehensive analysis. The active power loss and switch contact wear degree in this formula not only unilaterally affect the value of the operating time score, but the switch contact wear degree also indirectly affects the value of the active power loss. As the switch contact wears, its contact area may decrease, resulting in an increase in contact resistance. The increased contact resistance will directly lead to more heat and energy loss when the same current passes through. This part of the energy loss will eventually be in the form of active power loss. It is reflected in the formula. Secondly, worn contacts may be more likely to generate arcs when closing or opening. Arcs will not only cause additional energy loss, but may also further aggravate the wear and damage of the contacts. This vicious cycle will indirectly increase the active power loss. By considering the influence of the degree of wear of the switch contacts on the detection indicators of the switch equipment, the accuracy of obtaining the detection indicators of the switch equipment is improved, thereby achieving the improvement of the accuracy of obtaining the current protection tripping trigger signal during the operation and maintenance of the low-voltage plant switchgear, and effectively solving the problem of low real-time acquisition of switch equipment maintenance suggestions during the operation and maintenance of the low-voltage plant switchgear in the prior art.

[0066] Furthermore, the switch device detection module includes a real-time monitoring unit and a current protection tripping unit; the real-time monitoring unit is used to monitor the operating status of the low-voltage power line in a preset switch state during the switch device detection process in real time and obtain key operating parameters through sensors. The preset switch state includes the switch on state and the switch off state of the switch device. The key operating parameters include the current, voltage and temperature of the low-voltage power line; the current protection tripping unit is used to receive the acquired key operating parameters, and trigger the current protection tripping mechanism of the current protection tripping unit when the key operating parameters are equal to the corresponding rated parameters. The rated parameters include rated current, rated voltage and rated temperature. The rated temperature is obtained by summing and averaging the historical temperature data of the low-voltage power line in the preset database. The current protection tripping mechanism includes a current protection mechanism, a voltage protection mechanism and a temperature protection mechanism.

[0067] In this embodiment, the current of the low-voltage power line is measured in real time by a current sensor, the voltage of the low-voltage power line is measured in real time by a voltage sensor, and the temperature of the low-voltage power line is measured in real time by a temperature sensor; when the current reaches the rated current, the overcurrent protection mechanism is usually triggered, at which time the current transformer in the overcurrent protection mechanism is powered off, and the switch circuit is in a disconnected state, wherein the current transformer is used to measure the loop current in the switch circuit; when the voltage exceeds the rated voltage, the overvoltage protection mechanism is usually triggered, at which time the voltage transformer in the overvoltage protection mechanism is powered off, and the switch circuit is in a disconnected state, wherein the voltage transformer is used to measure the loop voltage in the switch circuit; the real-time response of the current protection tripping mechanism helps to prevent the switch circuit from overheating or damage, thereby improving the accuracy and safety of triggering the current protection tripping mechanism.

[0068] Furthermore, the current protection tripping mechanism of the triggering current protection tripping unit also includes obtaining the current protection tripping triggering coefficient according to the key operating parameters and the corresponding rated parameters as well as the detection current and the rated detection current. The current protection tripping triggering coefficient is obtained by detecting the current protection triggering coefficient, the voltage protection triggering coefficient and the temperature protection triggering coefficient. The detection current protection triggering coefficient represents the ratio of the absolute value of the difference between the detection current and the rated detection current of the low-voltage power line during the switch device detection process to the detection current reference deviation. The voltage protection triggering coefficient represents the ratio of the absolute value of the difference between the voltage and the rated voltage of the low-voltage power line during the switch device detection process to the voltage reference deviation. The temperature protection triggering coefficient represents the ratio of the absolute value of the difference between the temperature and the rated temperature of the low-voltage power line during the switch device detection process to the temperature reference deviation. The current protection tripping triggering coefficient is calculated by the following formula:

[0069]

[0070] Wherein, y is the serial number of the low-voltage power line, y=1,2,...,Y, Y is the total number of low-voltage power lines, m is the number of switch opening and closing operations, m=1,2,...,M, M is the preset number of switch opening and closing operations, e is a natural constant, It represents the detection current protection trigger coefficient of the y-th low-voltage power line during the m-th switch opening and closing operation. It represents the voltage protection triggering coefficient of the y-th low-voltage power line during the m-th switch opening and closing operation. It represents the temperature protection triggering coefficient of the y-th low-voltage power line during the m-th switch opening and closing operation.

[0071] In this embodiment, Where D1 y.m D1 represents the detection current of the yth low-voltage power line during the mth switch opening and closing operation. 0 Indicates the rated detection current, ΔD1 indicates the detection current reference deviation, E1 y.m It represents the voltage of the y-th low-voltage power line during the m-th switch opening and closing operation, E1 0 Indicates rated voltage, ΔE1 indicates voltage reference deviation, F1 y.m F1 represents the temperature of the yth low-voltage power line during the mth switch opening and closing operation. 0 represents the rated temperature, ΔF1 represents the temperature reference deviation, wherein the detection current reference deviation is usually represented by the sum and average of the historical detection currents in the preset database, the voltage reference deviation is usually represented by the sum and average of the historical voltages in the preset database, and the temperature reference deviation is usually represented by the sum and average of the historical temperatures in the preset database.

[0072] The rated detection current and rated voltage are usually set by the production personnel of the low-voltage plant switchgear, among which the rated detection current is usually the maximum allowable current of the low-voltage power line in the low-voltage plant switchgear during the switch equipment detection process, and the rated voltage is usually the maximum allowable voltage of the low-voltage power line in the low-voltage plant switchgear during the switch equipment detection process. The rated temperature is usually represented by the sum and average of the historical temperature data of the low-voltage power line in the preset database, which is usually the maximum allowable temperature of the low-voltage power line in the low-voltage plant switchgear during the switch equipment detection process. Therefore, in the process of calculating the current protection tripping trigger coefficient, the detection current of the low-voltage power line during the switch equipment detection process is less than or equal to the rated detection current, the voltage of the low-voltage power line during the switch equipment detection process is less than or equal to the rated voltage, and the temperature of the low-voltage power line during the switch equipment detection process is less than or equal to the rated temperature.

[0073] It should be understood that in the actual current protection tripping application scenario of the low-voltage plant switch cabinet, the current protection tripping trigger coefficient is used to measure the triggering degree of the current protection tripping mechanism of the current protection tripping unit. It should be noted that when one of the current protection triggering coefficient, voltage protection triggering coefficient and temperature protection triggering coefficient is 0, the switchgear is in the disconnected state at this time. This is because:

[0074] (1) When the current in the low-voltage power line reaches the preset rated value (i.e., the rated detection current), the current protection mechanism will trigger the circuit breaker to cut off the circuit to prevent damage caused by equipment overload or short circuit. At this time, the detection current protection trigger coefficient is 0 (i.e., the detection current of the low-voltage power line during the switch device detection process is equal to the rated detection current), which means that the circuit has been cut off, resulting in no current passing;

[0075] (2) Voltage protection is mainly used to prevent electrical equipment from being damaged by overvoltage or undervoltage. When the voltage reaches the rated voltage, the voltage protection mechanism will be activated, and the circuit will be cut off by the circuit breaker. At this time, the voltage protection trigger coefficient is 0 (that is, the voltage of the low-voltage power line during the switchgear detection process is equal to the rated voltage), which means that the circuit has been disconnected or the power supply has failed;

[0076] (3) Temperature protection is used to monitor the operating temperature of electrical equipment to prevent fire or equipment damage caused by overheating. When the temperature of the low-voltage power line during the switchgear detection process is equal to the rated temperature, the temperature protection trigger coefficient is 0, and the temperature protection mechanism will trigger the circuit breaker to operate. This is usually because the temperature sensor fails and the temperature signal cannot be detected.

[0077] However, it should be noted that, in actual situations, the possibility of a temperature protection trigger coefficient of 0 directly causing the switch device to disconnect is small, because temperature protection is usually used in conjunction with current or voltage protection, and its trigger threshold is set higher, thereby achieving improved accuracy and real-time acquisition of the current protection tripping trigger coefficient, thereby achieving improved accuracy in acquiring the current protection tripping trigger signal during the operation and maintenance of the low-voltage plant switchgear, and effectively solving the problem of low real-time acquisition of switch equipment maintenance suggestions during the operation and maintenance of the low-voltage plant switchgear in the prior art.

[0078] To summarize, the embodiment of the present application obtains the switch status data and pile head temperature data of the low-voltage plant switch cabinet, then obtains the switch abnormality data of the low-voltage plant switch cabinet within a preset time period and issues an audible and visual alarm, while performing a terminal display and performing switch equipment detection on the switch equipment within a preset period to obtain the wear parameters, and finally monitors the triggering of the circuit breaker of the switch equipment during the switch equipment detection process in real time and performs current protection tripping, thereby achieving improved accuracy and efficiency in the triggering of the current protection tripping, and further achieving improved real-time acquisition of maintenance suggestions in switch equipment detection, effectively solving the problem of low real-time acquisition of switch equipment maintenance suggestions during the operation and maintenance of the low-voltage plant switch cabinet in the prior art.

[0079] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0080] The present invention is described with reference to flowcharts and / or block diagrams of systems, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0081] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0082] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0083] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0084] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A low-voltage plant switch cabinet intelligent operation and maintenance system, characterized in that: include: Data acquisition module, alarm information push module, remote monitoring and control module and switch equipment detection module; The data acquisition module is used to acquire the switch status data of the low-voltage plant switch cabinet through the switch link, and acquire the pile head temperature data of the low-voltage plant switch cabinet through the temperature link. The switch link communicates with the switch equipment in the low-voltage plant switch cabinet. The switch status data includes the switch current and the switch load, and the pile head temperature data includes the copper busbar temperature, the upper pile head temperature and the lower pile head temperature. The alarm information push module is used to obtain the switch abnormality data of the low-voltage plant switch cabinet within a preset time period and issue an audible and visual alarm. The switch abnormality data includes overcurrent, overload and temperature warning data. The temperature warning data is used to measure the temperature abnormality of the pile head temperature data within a preset time period. The audible and visual alarm is used to convert the switch abnormality data into a warning reminder in the form of sound and light and push it as alarm information to the cloud server of the low-voltage plant switch cabinet; The remote monitoring and control module is used to receive the alarm information pushed by the alarm information push module and display it on the terminal. At the same time, the terminal user controls the switch on and off according to the control instructions displayed on the terminal. The terminal display includes a local screen display and a remote background display. The control instructions are the content of the alarm information; The switch device detection module is used to communicate with the switch device and monitor in real time the triggering of the circuit breaker of the switch device during the separation control process, and at the same time, perform switch device detection on the switch device within a preset period to obtain a loss coefficient. The switch device detection is used to check the operating status of the switch device within the preset period and generate corresponding maintenance suggestions. The operating status includes the total number of opening and closing times of the switch device, the wear of the switch contacts, and the current protection tripping. The loss coefficient includes the number of switch opening and closing times and the degree of wear of the switch contacts; The step of obtaining the switch abnormality data of the low-voltage plant switch cabinet within a preset time period further includes recording the operation timestamp of the switch equipment in real time to obtain the operation time score, wherein the operation timestamp includes the operation current timestamp and the operation load timestamp; The operating current timestamp includes a first current timestamp and a second current timestamp, wherein the first current timestamp indicates the difference between the time when the switch device generates the switching current when it starts to operate within a preset time period and the time when the operating signal is received, and the second current timestamp indicates the difference between the time when the switching current reaches the overcurrent during the operation of the switch device within the preset time period and the time when the switching current is generated when it starts to operate; The operation load timestamp includes a first load timestamp and a second load timestamp, wherein the first load timestamp indicates the difference between the time when the switch load is generated when the switch device starts to operate within a preset time period and the time when the operation signal is received, and the second load timestamp indicates the difference between the time when the switch load reaches the overload during the operation of the switch device within the preset time period and the time when the switch load is generated when the switch device starts to operate; The operating time score is used to measure the efficiency of the sound and light alarms during the operation of the switchgear within a preset time period; The run time score is calculated using the following formula: Where n is the number of the preset time period, n = 1, 2, ..., N, N is the total number of preset time periods, e is a natural constant, YUN n It indicates the operating time fraction of the switchgear in the low-voltage plant switchgear during the nth preset time period. Indicates the first current timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, Indicates the reference first current timestamp, Indicates the second current timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, represents a reference second current timestamp within a preset time period, Indicates the first load timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, Indicates the reference first load timestamp, Indicates the second load timestamp of the switchgear in the low-voltage plant switch cabinet within the nth preset time period, Indicates the reference second load timestamp.

2. The low-voltage plant switch cabinet intelligent operation and maintenance system according to claim 1, characterized in that: The specific steps for obtaining the temperature warning data are: Real-time recording of the temperature timestamp of the pile head temperature data reaching the preset temperature, wherein the preset temperature includes the preset copper bar temperature, the preset upper pile head temperature and the preset lower pile head temperature, and the temperature timestamp includes the first temperature timestamp, the second temperature timestamp and the third temperature timestamp; The temperature sensor is used to monitor the changes of the pile head temperature data within a preset time period in real time and obtain the pile head temperature loss value. At the same time, the temperature warning data is obtained by combining the obtained temperature timestamp and running time score. The pile head temperature loss value includes the copper busbar temperature loss value, the upper pile head temperature loss value and the lower pile head temperature loss value.

3. The low-voltage plant switch cabinet intelligent operation and maintenance system according to claim 1, characterized in that: The receiving of the alarm information pushed by the alarm information pushing module further includes classifying the alarm information into levels, wherein the level classification includes a severe level, a warning level and a general level.

4. The low-voltage plant switch cabinet intelligent operation and maintenance system as claimed in claim 3, characterized in that: The specific steps of performing switch device detection on the switch device within the preset period are: The circuit breaker in the switchgear monitors the operating status of the switchgear in real time according to the alarm information classified by level and the preset detection parameters, wherein the preset detection parameters include the preset time of switch opening and closing and the preset number of switch opening and closing; Real-time monitoring of current changes during the operation of the switchgear. When the current during the operation of the switchgear is equal to the preset detection current value, the current protection of the circuit breaker is triggered to trip and fault feedback is performed.

5. The intelligent operation and maintenance system for low-voltage power station switch cabinet according to claim 4, characterized in that: The switch device is tested within a preset period, and then the switch device test index is obtained according to the acquired wear parameters. The switch device test index is used to measure the performance stability of the switch device during the switch device test. The specific acquisition process is as follows: Real-time measurement of resistance and current values ​​in low-voltage power lines to obtain line resistance loss, and at the same time obtain active power loss when the transformer in the low-voltage power line is unloaded; The initial friction force of the switch contact of the switch device before the switch device is detected and the dynamic friction force during the switch device detection process are measured in real time by a friction force sensor to obtain the degree of wear of the switch contact; The switch equipment detection index is obtained by combining the line resistance loss, active power loss and switch contact wear degree.

6. The low-voltage plant switch cabinet intelligent operation and maintenance system according to claim 5, characterized in that: The switchgear detection index is calculated by the following formula: Where n is the number of the preset time period, n = 1, 2, ..., N, N is the total number of preset time periods, m is the number of switch opening and closing operations, m = 1, 2, ..., M, M is the preset number of switch opening and closing operations, y is the number of the low-voltage power line, y = 1, 2, ..., Y, Y is the total number of low-voltage power lines, e is a natural constant, CE n.m Indicates the switch device detection index of the mth switch opening and closing operation of the switch device within the nth preset time period, YUN n Indicates the operating time fraction of the switchgear in the low-voltage plant switchgear during the nth preset time period, WEN n Indicates the temperature warning data of the switchgear in the low-voltage plant switch cabinet in the nth preset time period. It represents the line resistance loss of the yth low-voltage power line during the mth switch opening and closing operation within the nth preset time period, K represents the active power loss of the yth low-voltage power line at the mth switch opening and closing operation within the nth preset time period, n.m Indicates the degree of wear of the switch contacts of the switching device during the mth switching operation within the nth preset time period.

7. The intelligent operation and maintenance system for low-voltage power station switch cabinet according to claim 1, characterized in that: The switchgear detection unit includes a real-time monitoring unit and a current protection tripping unit; The real-time monitoring unit is used to monitor the operating state of the low-voltage power line in a preset switch state during the switchgear detection process in real time and obtain key operating parameters through sensors; The current protection tripping unit is used to receive the acquired key operating parameters and trigger the current protection tripping mechanism of the current protection tripping unit when the key operating parameters are equal to the corresponding rated parameters.

8. The intelligent operation and maintenance system for low-voltage power station switch cabinet according to claim 7, characterized in that: The current protection tripping mechanism of the triggering current protection tripping unit also includes obtaining a current protection tripping triggering coefficient, and the current protection tripping triggering coefficient is calculated by the following formula: Wherein, y is the serial number of the low-voltage power line, y=1,2,...,Y, Y is the total number of low-voltage power lines, m is the number of switch opening and closing operations, m=1,2,...,M, M is the preset number of switch opening and closing operations, e is a natural constant, It represents the detection current protection trigger coefficient of the y-th low-voltage power line during the m-th switch opening and closing operation. It represents the voltage protection triggering coefficient of the y-th low-voltage power line during the m-th switch opening and closing operation. It represents the temperature protection triggering coefficient of the y-th low-voltage power line during the m-th switch opening and closing operation.

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