Cable well state comprehensive monitoring method and system

Abstract

The invention relates to the technical field of power cable monitoring, in particular to a comprehensive monitoring method and system for the state of a cable well, solves the problem of how to comprehensively monitor the internal environment of the cable well through a sensor, effectively reduce the installation cost and prolong the service life of the sensor, and provides a monitoring method. Comprising the steps of calculating actual environment data in a cable well according to internal environment data and first external environment data; controlling the temperature difference detection group to switch between a power saving mode and an activation mode according to the internal environment data; predicting a theoretical highest temperature according to the first temperature result, and judging whether the power-saving mode needs to be switched to an activation mode or not; if yes, correcting the theoretical highest temperature according to the temperature value of each temperature difference sensor in the target detection group to obtain a corrected highest temperature; and adjusting a switching threshold value of the standby detection group according to the theoretical highest temperature and the corrected highest temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of power cable monitoring, and in particular to a method and system for comprehensive monitoring of cable well status. Background Art

[0002] With the advancement of science and technology, the power system has become more and more important in our daily life. Underground cables are a key component of the system, responsible for the transmission and distribution of electricity. Underground cables are generally laid through cable wells. As a structural facility, cable wells are widely used in the laying and maintenance of remote power supply cables, mainly for the protection and management of cables. In the daily operation process, environmental problems that threaten the reliability of cable power supply may occur in the cable well, such as excessive temperature and humidity in the cable well. Therefore, it is particularly important to monitor the environment in the cable well.

[0003] Environmental monitoring in cable wells mainly relies on manual inspections and manual records. Not only does it require staff to open the cable well covers one by one along the cable line for inspection, which makes work efficiency low, but it can only be inspected regularly, resulting in problems with untimely monitoring. In addition, since the cable well is underground and the internal space is small, manual inspections can only check the general situation in the cable well and cannot obtain detailed environmental data, making it impossible for the cable to operate in the optimal environment, reducing power supply reliability.

[0004] At present, comprehensive monitoring of the environment in cable wells in China mostly uses sensor devices, but the sensors of traditional environmental monitoring systems have short lifespans and low sensitivity, and require external power supply. In addition, the sensor devices are in operation for a long time, which aggravates the loss of power and waste of resources. Therefore, there is an urgent need for an efficient and low-energy monitoring solution to improve the reliability and comprehensiveness of cable well environmental monitoring. Summary of the invention

[0005] The problem solved by the present invention is: how to use sensors to comprehensively monitor the internal environment of a cable well while effectively reducing installation costs and extending the service life of the sensors.

[0006] To solve the above problems, an embodiment of the present invention provides a comprehensive monitoring method for the status of a cable well, which includes: obtaining internal environmental data of the cable well through a temperature difference sensor, and calculating actual environmental data in the cable well according to the internal environmental data and the first external environmental data of the target area; dividing the temperature difference sensor into multiple temperature difference detection groups, and controlling the temperature difference sensor to switch between a power saving mode and an activation mode according to the internal environmental data; recording the temperature difference detection group in the activation mode as a target detection group, and recording the temperature difference detection group in the power saving mode as a standby detection group; obtaining the temperature value of each temperature difference sensor in the standby detection group to obtain a first temperature result; predicting the theoretical maximum temperature in the target area according to the first temperature result, and judging whether the power saving mode needs to be switched to the activation mode according to the theoretical maximum temperature; if so, correcting the theoretical maximum temperature according to the temperature value of each temperature difference sensor in the target detection group to obtain a corrected maximum temperature; adjusting the switching threshold of the standby detection group under different actual environmental data according to the theoretical maximum temperature and the corrected maximum temperature.

[0007] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: the temperature difference sensor can monitor the changes in ambient temperature in real time, and change the working mode of the temperature difference sensor according to the temperature changes, so as to reduce its power consumption and extend the service life of the temperature difference sensor. Timely acquisition of internal environmental data can help staff to understand the operating status of the cable well in time and avoid the occurrence of faults. First, the acquisition of external environmental data fully considers the impact of extreme changes in the external environment during the target time period on the working status of the cable well, so as to timely discover potential safety hazards and reduce the risk of failure. By switching the temperature difference sensor between power saving mode and activation mode, the number of working temperature difference sensors is reduced as much as possible while ensuring the monitoring intensity, thereby extending its service life. The prediction of the theoretical maximum temperature is helpful to timely judge potential high temperature risks and provides a basis for judging the switching between power saving mode and activation mode. The switching threshold between power saving mode and activation mode is judged by correcting the maximum temperature. Whether it is accurate, and adjust the switching threshold in time, so that the temperature difference sensor can quickly respond to temperature changes under different environmental conditions, ensure that the working mode is automatically switched when the temperature reaches the switching threshold, and improve the timeliness and effectiveness of monitoring. The setting of maintenance records takes into account the influence of the service life of the cable line and the number of maintenance times on the internal ambient temperature of the cable well, so that the working mode of the temperature difference detection group is more in line with the working status of the cable well itself. The setting of the maintenance threshold takes into account the working year of the cable well and its maintenance record. By comparing the number of maintenance times in a certain area of ​​the cable well with the maintenance threshold, potential problem areas where failures may occur can be identified in advance, and special monitoring can be carried out to improve the pertinence and effectiveness of monitoring. The calculation of the minimum distance and the sum of the minimum distances can quickly determine the temperature difference detector group that can monitor a specific monitoring location, increase its monitoring frequency or adjust its time in activation mode, so as to detect problems in time before potential failures occur, and improve the scientificity and timeliness of the monitoring method.

[0008] In one embodiment of the present invention, internal environmental data of a cable well is obtained through a temperature difference sensor, and actual environmental data in the cable well is calculated based on the internal environmental data and first external environmental data of a target area, specifically including: determining a first external environmental temperature based on the first external environmental data, and obtaining the internal environmental temperature of the cable well based on the temperature difference sensor; calculating a first correction coefficient based on the first external environmental temperature and the internal environmental temperature; obtaining the future external temperature of the target area where the cable well is located based on a weather forecast; and calculating actual environmental data of the cable well within a target time period based on the first correction coefficient and the future external temperature.

[0009] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: the calculation of the first correction coefficient quantifies the influence of the first external ambient temperature on the internal ambient temperature of the cable well, which can not only reflect the changes of the internal ambient temperature following the first external ambient temperature under specific environmental conditions, but also can help predict the changing trend of the internal ambient temperature of the cable well within the target time period when the external ambient temperature changes rapidly, thereby improving the accuracy of the prediction.

[0010] In one embodiment of the present invention, the temperature difference sensor is divided into a plurality of temperature difference detection groups, and the temperature difference sensor is controlled to switch between a power saving mode and an activation mode according to internal environmental data, specifically comprising: distributing the temperature difference sensors equidistantly on the cable lines in the cable well, numbering each temperature difference sensor, setting a grouping interval, and dividing the temperature difference sensors into a plurality of temperature difference detection groups according to the numbers; obtaining the actual ambient temperature according to the temperature difference detection groups, and determining a temperature safety threshold according to the actual ambient temperature; and controlling the temperature difference sensor to switch between a power saving mode and an activation mode according to the internal ambient temperature and the temperature safety threshold.

[0011] Compared with the existing technology, the technical effect achieved by adopting this technical scheme is as follows: the grouping interval is designed to optimize the monitoring effect of the target detection group, so that when the standby detection group is in power saving mode, the target detection group alone can effectively cover the entire area in the cable well. By reasonably setting the grouping interval, it is possible to realize real-time monitoring of the operating status of the cable well and its internal ambient temperature while reducing the working time of the standby detection group. The setting of the temperature safety threshold takes into account the changes in the actual ambient temperature, and it can be flexibly adjusted according to the actual ambient temperature, thereby reducing erroneous activation events caused by temperature anomalies and improving the safety and reliability of the monitoring method.

[0012] In one embodiment of the present invention, the temperature difference sensor is controlled to switch between the power saving mode and the activation mode according to the internal ambient temperature and the temperature safety threshold, specifically including: obtaining the highest internal ambient temperature in the target detection group according to the temperature difference sensor, recorded as the highest internal temperature; when the highest internal temperature is greater than or equal to the temperature safety threshold, the standby detection group switches from the power saving mode to the activation mode; when the highest internal temperature is less than the temperature safety threshold, the standby detection group maintains the power saving mode, and determines whether the power saving mode needs to be switched to the activation mode according to the actual environmental data.

[0013] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: the acquisition of the maximum internal temperature provides accurate data support for the subsequent switching of the working mode of the standby detection group. By monitoring the maximum internal temperature, the standby detection group can maintain power saving mode operation under temperature safety conditions, thereby extending its service life. The standby detection group can also be started in time when the temperature is abnormal, ensuring the safe operation of the cable line.

[0014] In one embodiment of the present invention, when the maximum internal temperature is lower than the temperature safety threshold, the standby detection group maintains operation in the power saving mode, and determines whether the power saving mode needs to be switched to the activation mode based on actual environmental data, specifically including: predicting the future current load in the target time period based on the historical current load of the cable well, and calculating the compensation coefficient based on the future external temperature and the future current load; calculating the actual maximum internal temperature of the target detection group based on the compensation coefficient and the maximum internal temperature; and determining whether the standby detection group needs to be switched from the power saving mode to the activation mode based on the actual maximum internal temperature and the temperature safety threshold.

[0015] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: the future current load calculation takes into account the thermal response time required for the current load change, significantly improving the accuracy of the temperature difference sensor's monitoring of the cable well temperature change, thereby realizing forward-looking monitoring of the cable well temperature, avoiding the passive activation of the standby detection group only when the temperature is overheated, and improving the reliability and safety of the monitoring method. The setting of the compensation coefficient takes into account the impact of special environmental conditions, such as drastic temperature fluctuations, sudden changes in current load, and other factors on the monitoring system. By reasonably setting the compensation coefficient, the actual maximum internal temperature under special environments can be predicted, effectively avoiding the delayed switching of the working state of the standby detection group caused by environmental changes, and ensuring that the standby detection group can respond quickly and conduct effective monitoring under abnormal conditions, thereby improving the accuracy and reliability of the monitoring method.

[0016] In one embodiment of the present invention, the theoretical maximum temperature in the target area is predicted based on the first temperature result, and whether the power saving mode needs to be switched to the activation mode is determined based on the theoretical maximum temperature, specifically including: predicting the theoretical maximum temperature of the target detection group in the target area based on the grouping interval and the first temperature result; when the theoretical maximum temperature is less than the temperature safety threshold, the standby detection group maintains the power saving mode; when the theoretical maximum temperature is greater than or equal to the temperature safety threshold, controlling the standby detection group to switch from the power saving mode to the activation mode.

[0017] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: by calculating the theoretical maximum temperature, the working mode of the standby detection group can be effectively managed. When the theoretical maximum temperature is lower than the temperature safety threshold, maintaining the power saving mode helps save energy and extend the service life of the temperature difference sensor. When the theoretical maximum temperature is higher than the temperature safety threshold, the standby detection group is switched to the activation mode in time, which helps to improve the monitoring capability of the temperature difference sensor, ensure the real-time and accuracy of the monitoring data, and help prevent failures and safety accidents caused by overheating of the cable well.

[0018] In one embodiment of the present invention, the theoretical maximum temperature of the target detection group in the target area is predicted based on the grouping interval and the first temperature result, specifically including: according to the grouping interval, the temperature difference values ​​between two adjacent temperature difference sensors in the target detection group are obtained in sequence, and the temperature change trend of the cable well in the target direction is judged according to the temperature difference value to obtain a first change trend; when the first change trend changes from an upward trend to a downward trend, the internal ambient temperature that has changed is marked as a turning temperature; when there is only one turning temperature, the internal ambient temperature adjacent to the turning temperature is recorded as a comparison temperature; when the two comparison temperatures are the same, the theoretical maximum temperature is equal to the turning temperature, and when the two comparison temperatures are different, the two comparison temperatures are compared to obtain a first comparison result, and the theoretical maximum temperature of the target detection group is calculated based on the future current load and the first comparison result; when there are multiple turning temperatures, the maximum value of the comparison temperature is screened out and recorded as the maximum temperature value, and the theoretical maximum temperature is calculated using the turning temperature corresponding to the maximum temperature value.

[0019] Compared with the existing technology, the technical effects achieved by adopting this technical solution are as follows: the setting of grouping intervals not only improves the precision of data analysis, but also can more accurately reflect the temperature changes of the cable wells in each monitoring area, which helps to timely discover potential fault hazards; the setting of the turning temperature helps to timely identify the key nodes of the cable well temperature changes, which helps to calculate the theoretical maximum temperature and reduce the error in calculating the theoretical maximum temperature; the calculation of the heating efficiency takes into account the impact of future current loads on the theoretical maximum temperature, thereby better reflecting the theoretical maximum temperature of the cable line under future current loads, and further improving the accuracy of the theoretical maximum temperature calculation; the setting of the maximum temperature value allows the maximum comparison temperature to be preferentially screened out when there are multiple turning temperatures in the target detection group, thereby improving the calculation efficiency of the theoretical maximum temperature and its safety and reliability.

[0020] In one embodiment of the present invention, the switching threshold of the standby detection group under different actual environmental data is adjusted according to the theoretical maximum temperature and the corrected maximum temperature, specifically including: when the corrected maximum temperature is greater than or equal to the theoretical maximum temperature, the temperature safety threshold has a second correction coefficient at the corresponding internal ambient temperature; when the corrected maximum temperature is greater than the temperature safety threshold and less than the theoretical maximum temperature, the temperature safety threshold does not need to be adjusted; when the corrected maximum temperature is less than or equal to the temperature safety threshold, the temperature safety threshold has a third correction coefficient at the corresponding internal ambient temperature.

[0021] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: the calculation of the second correction coefficient and the third correction coefficient takes into account the possible difference in the maximum temperature obtained by the target detection group and the standby detection group, and analyzes the impact of this difference on the temperature safety threshold. By dynamically correcting the temperature safety threshold, it is ensured that the standby detection group has a more scientific and accurate switching threshold when switching, and prevents the standby detection group from being frequently erroneously activated due to improper setting of the temperature safety threshold, while improving the overall operating efficiency of the temperature difference detection group. In addition, the optimized temperature safety threshold helps to extend the service life of the temperature difference detection group, reduce the maintenance and replacement costs caused by frequent activation, and ensure the stability and reliability of the temperature difference detection group in different working environments.

[0022] In one embodiment of the present invention, a comprehensive cable well status monitoring system is also provided. The comprehensive cable well status monitoring method recorded in the above embodiment is applied to the monitoring system. The monitoring system includes: a monitoring module, which is used to monitor the actual environmental data in the cable well; a calculation module, which is used to calculate the theoretical maximum temperature; a judgment module, which is used to judge whether the standby detection group needs to switch to the activation mode according to the actual environmental data. The monitoring system has all the technical features of the above monitoring method, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 One of the flow charts of the comprehensive monitoring method for cable well status; Figure 2 This is the second flow chart of the comprehensive monitoring method for cable well status; Figure 3 This is the third flow chart of the comprehensive monitoring method for cable well status; Figure 4 This is the fourth flow chart of the comprehensive monitoring method for cable well status; Figure 5 This is a system schematic diagram of the cable well status comprehensive monitoring system; Description of reference numerals: 100 - monitoring system; 110 - monitoring module; 120 - computing module; 130 - storage module; 140 - judgment module. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] First embodiment See also Figure 1 In a specific embodiment, the present invention provides a cable well status comprehensive monitoring method, the cable well status comprehensive monitoring method comprising: S100, obtaining internal environmental data of the cable well through a temperature difference sensor, and calculating actual environmental data in the cable well according to the internal environmental data and first external environmental data of the target area; S200, dividing the temperature difference sensor into a plurality of temperature difference detection groups, and controlling the temperature difference sensor to switch between a power saving mode and an activation mode according to internal environment data; S300, recording the temperature difference detection group in the activation mode as the target detection group, and recording the temperature difference detection group in the power saving mode as the standby detection group; S400, obtaining the temperature value of each temperature difference sensor in the standby detection group to obtain a first temperature result; S500, predicting a theoretical maximum temperature in the target area according to the first temperature result, and determining whether the power saving mode needs to be switched to the activation mode according to the theoretical maximum temperature; S600: If yes, the theoretical maximum temperature is corrected according to the temperature value of each temperature difference sensor in the target detection group to obtain a corrected maximum temperature; S700: Adjust the switching threshold of the standby detection group under different actual environmental data according to the theoretical maximum temperature and the corrected maximum temperature.

[0026] In step S100, the temperature difference sensor is a device for measuring and monitoring the temperature difference at different locations and at different times in the environment. It usually uses technologies such as thermocouples, thermistors or infrared sensors. By comparing the temperature difference between two or more measurement points, it is determined whether the temperature difference sensor needs to switch the working mode, thereby achieving energy saving. The internal environmental data of the cable well usually refers to various physical and chemical parameters related to the cable and its operating environment, including: temperature, humidity, water level, gas concentration, etc. These parameters are crucial for the safe operation and maintenance of the cable. The first external environmental data refers to real-time external environmental data, that is, meteorological information of the target area where the cable well is located, including the temperature, humidity, wind speed, precipitation, etc. of the target area. The target area is usually the urban area or township where the cable well is installed. Through real-time monitoring and analysis of the first external environmental data, it is possible to more comprehensively understand the environmental conditions of the cable well and promptly discover potential risks in the normal operation of the cable well.

[0027] In step S200 and step S300, the number of temperature difference detection groups is usually two or more, preferably 3, 4 and 5. The power saving mode refers to an operating mode in which the service life of the temperature difference sensor is extended by reducing the data acquisition frequency or reducing the number of its operations, while the activation mode refers to an operating mode in which the internal ambient temperature is collected and monitored by increasing the operating frequency or increasing the number of the temperature difference sensor. It can quickly respond to changes in ambient temperature to provide more accurate environmental monitoring information.

[0028] In step S400 to step S600, the temperature values ​​of all temperature difference sensors in the target detection group are recorded as the second temperature result. The first temperature result and the second temperature result refer to the set of temperature values ​​measured by different temperature difference detection groups on the cable line at the same time point. These two temperature results are usually obtained periodically, and the time length of the cycle can be adjusted according to the load of the cable. For cable lines with higher loads, the time length of each cycle is usually set to a shorter time interval so that temperature changes and potential overheating risks can be captured in time. For cable lines with lower loads, the time length of each cycle is longer to reduce unnecessary monitoring frequency and system burden. Specifically, the periodic time length of high-load cables is usually between 1 and 5 minutes, preferably 1.5 minutes, 2.5 minutes and 3.5 minutes. The periodic time length of low-load cables is usually between 5 and 15 minutes, preferably 7.5min, 8.5min and 9.5min. The theoretical maximum temperature is the maximum temperature value that the standby detection group may reach within the target time period predicted based on the first temperature result and the grouping interval. The target time period is usually 3 hours. The calculation of the theoretical maximum temperature helps to determine whether the standby detection group needs to switch to the activation mode under potential high temperature risks, so as to start comprehensive monitoring in time and ensure the safe operation of the cable well. The theoretical maximum temperature obtained by only turning on the target detection group may be different from the maximum temperature value obtained when the target detection group and the standby detection group are turned on at the same time. Therefore, the corrected maximum temperature is to make a preliminary prediction of the theoretical maximum temperature, and further adjust and optimize the theoretical maximum temperature in combination with the second temperature result actually obtained, which provides a more accurate and reliable basis for judging whether the working mode of the temperature difference sensor needs to be switched, and effectively improves the safety and reliability of the temperature difference sensor in early warning work.

[0029] It should be noted that when the standby detection group does not need to switch to the activation mode, both the standby detection group and the target detection group maintain the current working status.

[0030] In step S700, the switching threshold is the temperature limit that determines the switch of the standby detection group between the power saving mode and the activation mode. The switching threshold is not fixed, but is dynamically adjusted according to the theoretical maximum temperature and the corrected maximum temperature. Specifically, when the corrected maximum temperature is less than or equal to the theoretical maximum temperature, it means that the decision of the standby detection group to switch to the activation mode is reasonable, and the switching threshold does not need to be adjusted. When the corrected maximum temperature is greater than the theoretical maximum temperature, it means that the standby detection group is erroneously activated, and the switching threshold needs to be adjusted accordingly.

[0031] It should be noted that maintenance records usually provide fault information of cable wells under different actual environmental conditions, revealing the impact of potential environmental changes on the operating status of cable wells. By analyzing maintenance records, the frequency of failures in cable wells under different temperature conditions can be obtained. At the same time, the aging degree of cable lines can be evaluated, which helps the target detection team to adjust its working status in a targeted manner to improve the accuracy of fault warning.

[0032] Therefore, it is also possible to obtain the maintenance record of the cable well, determine the working status of the temperature difference detection group according to the maintenance record, obtain the number of maintenance times of the cable well in the first time period according to the maintenance record, and set the maintenance threshold according to the working year of the cable well; when the number of maintenance times is greater than or equal to the maintenance threshold, record the location where the cable well maintenance occurs as a specific monitoring location; obtain the minimum distance between each specific monitoring location and each temperature difference detection group; calculate the sum of the minimum distances corresponding to each temperature difference detection group to obtain the distance detection result, and determine the temperature difference detection group that enters the activation mode according to the distance detection result.

[0033] The first time period is usually 10 years. The maintenance threshold refers to a standard value set according to the maintenance record and working years of the cable well during the first time period. When the number of maintenance times in a certain area of ​​the cable well reaches or exceeds the maintenance threshold, it indicates that the area may have a higher risk of failure, which is recorded as a specific monitoring location. The maintenance threshold V and the working years Y of the cable well satisfy the following relationship: 1 year ≤ Y ≤ 3 years, V ≤ 4 times; 3 years<Y≤5 years, V≤7 times; 5 years<Y≤8 years, V≤9 times; 8 years<Y≤10 years, V≤12 times.

[0034] For example, when the working years of the cable well are 3 years and the number of maintenance times of a specific monitoring location is 5 times, the number of maintenance times of the specific monitoring location exceeds the maintenance threshold.

[0035] By calculating the minimum distance between each specific monitoring location and each temperature difference sensor around it, it can be ensured that the nearest and most relevant monitoring point is selected, which helps to improve the accuracy and reliability of monitoring. However, there are usually multiple specific monitoring locations, and there are usually multiple temperature difference sensors nearby. These temperature difference sensors may belong to the same or different temperature difference detection groups. Therefore, calculating the sum of the minimum distances between each temperature difference detection group and all specific monitoring locations can reduce misjudgments caused by abnormal readings of a single temperature difference sensor, and help evaluate the importance and effectiveness of the temperature difference detection group. The smaller the sum of the minimum distances, the closer the temperature difference detection group is to multiple high-risk areas, and it may need to remain in activation mode for a long time.

[0036] The temperature difference sensor can monitor the changes in ambient temperature in real time, and change the working mode of the temperature difference sensor according to the temperature changes, so as to reduce its power consumption and extend the service life of the temperature difference sensor. Timely acquisition of internal environmental data can help staff to understand the operating status of the cable well in time and avoid the occurrence of faults. First, the acquisition of external environmental data fully considers the impact of extreme changes in the external environment during the target time period on the working status of the cable well, so as to timely discover potential safety hazards and reduce the risk of failure. By switching the temperature difference sensor between power saving mode and activation mode, the number of working temperature difference sensors can be reduced as much as possible while ensuring the intensity of monitoring, thereby extending its service life. The prediction of the theoretical maximum temperature helps to timely judge potential high temperature risks and provides a basis for the switching between power saving mode and activation mode. The maximum temperature is corrected to determine whether the switching threshold between power saving mode and activation mode is accurate, and the switching threshold and Adjustments are made in time so that the temperature difference sensor can quickly respond to temperature changes under different environmental conditions, ensuring that the working mode is automatically switched when the temperature reaches the switching threshold, thereby improving the timeliness and effectiveness of monitoring. The setting of maintenance records takes into account the impact of the service life of the cable line and the number of maintenance times on the internal ambient temperature of the cable well, so that the working mode of the temperature difference detection group is more in line with the working status of the cable well itself. The setting of the maintenance threshold takes into account the working year of the cable well and its maintenance record. By comparing the number of maintenance times in a certain area of ​​the cable well with the maintenance threshold, potential problem areas where failures may occur can be identified in advance, and special monitoring can be carried out to improve the pertinence and effectiveness of monitoring. The calculation of the minimum distance and the sum of the minimum distances can quickly determine the temperature difference detector group that can monitor a specific monitoring location, increase its monitoring frequency or adjust its time in activation mode, so as to detect problems in time before potential failures occur, thereby improving the scientificity and timeliness of the monitoring method.

[0037] Second embodiment See also Figure 2 In a specific embodiment, the internal environment data of the cable well is obtained by a temperature difference sensor, and the actual environment data in the cable well is calculated according to the internal environment data and the first external environment data of the target area, which specifically includes: S110, determining a first external environment temperature according to the first external environment data, and obtaining an internal environment temperature of the cable well according to a temperature difference sensor; S120, calculating a first correction coefficient according to the first external environment temperature and the internal environment temperature; S130, obtaining the future outside temperature of the target area where the cable well is located according to the weather forecast; S140. Calculate actual environmental data of the cable well within a target time period according to the first correction coefficient and the future outside temperature.

[0038] In step S110 to step S140, the cable well may face different environmental conditions during actual operation. By considering the relationship between the external ambient temperature and the internal ambient temperature, the first correction coefficient is calculated. The actual ambient temperature of the cable well in the target section can be more accurately predicted in combination with the future external temperature, so that the temperature difference sensor can monitor the abnormal temperature in the target time period in time to prevent safety accidents caused by abnormal temperature. The calculation formula of the first correction coefficient is as follows: .

[0039] in, k 1 is the first correction coefficient, k 0 It is a reference correction factor, which is usually determined based on factors such as the type of cable line, insulation material characteristics and installation environment conditions. is the average internal ambient temperature in °C. is the average value of the first external environment temperature, in °C.

[0040] The actual environmental data includes the actual ambient temperature, which is the future internal ambient temperature of the cable well within the target time period calculated based on the future external temperature. The calculation formula is: .

[0041] in, T a,i is the actual ambient temperature at the i-th moment in the target time period, in °C. T f，i is the future outside temperature at the i-th moment in the target time period, in °C, k 1 is the first correction coefficient.

[0042] The calculation of the first correction coefficient quantifies the influence of the first external ambient temperature on the internal ambient temperature of the cable well. It can not only reflect the changes of the internal ambient temperature following the first external ambient temperature under specific environmental conditions, but also help predict the changing trend of the internal ambient temperature of the cable well within the target time period when the external ambient temperature changes rapidly, thereby improving the accuracy of the prediction.

[0043] Third embodiment See also Figure 3 In a specific embodiment, the temperature difference sensor is divided into a plurality of temperature difference detection groups, and the temperature difference sensor is controlled to switch between the power saving mode and the activation mode according to the internal environment data, specifically including: S210, distributing the temperature difference sensors equidistantly on the cable lines in the cable well, numbering each temperature difference sensor, setting a grouping interval, and dividing the temperature difference sensors into a plurality of temperature difference detection groups according to the numbers; S220, obtaining the actual ambient temperature according to the temperature difference detection group, and determining the temperature safety threshold according to the actual ambient temperature; S230: Control the temperature difference sensor to switch between a power saving mode and an activation mode according to the internal environment temperature and the temperature safety threshold.

[0044] In step S210, equidistant distribution refers to installing the temperature difference sensors evenly at equal distances on the cable line in the cable well to ensure that the cable well can be fully monitored and to avoid distortion of temperature data caused by uneven distribution of the temperature difference sensors. The grouping interval refers to the distance between two groups of temperature difference sensors set when grouping the temperature difference sensors. The grouping interval may also refer to a fixed distance used when selecting temperature difference sensors at a certain distance and dividing them into a group of temperature difference sensor groups. For example, when the cable line is 12m long, a temperature difference sensor is installed at every 1m interval, and the grouping interval is set to 3m. All temperature difference sensors are divided into 4 groups, and the grouping method is: those numbered 0, 1 and 2 are recorded as the first temperature difference detection group, and those numbered 3, 4 and 5 are recorded as the second temperature difference detection group. The temperature difference sensors are divided into three groups, wherein the grouping interval refers to the distance between the first temperature difference sensors in the same direction in each temperature difference detection group, such as the temperature difference sensor 0 in the first temperature difference detection group and the temperature difference sensor 3 in the second temperature difference detection group is 3m apart, or the temperature difference sensors numbered 0, 3, 6, 9 and 12 are divided into one temperature difference detection group, the temperature difference sensors numbered 1, 4, 7 and 10 are divided into one temperature difference detection group, and the temperature difference sensors numbered 2, 5, 8 and 11 are divided into one temperature difference detection group, and the temperature difference sensors can be divided into three groups, wherein the grouping interval refers to the temperature difference sensor number interval in the same temperature difference detection group is 3m, such as the temperature difference sensors 0 and 3 are 3m apart.

[0045] In step S220 and step S230, the temperature safety threshold refers to the maximum temperature value allowed to appear in the cable well under normal operating conditions. As long as the internal ambient temperature is lower than the temperature safety threshold, the cable well will not experience operational failures due to changes in the internal ambient temperature. The temperature safety threshold is set based on the actual ambient temperature of the cable well, and is usually 1.02 to 1.10 times the highest actual ambient temperature, preferably 1.04 and 1.05 times.

[0046] The grouping interval is designed to optimize the monitoring effect of the target detection group, so that when the standby detection group is in power saving mode, the target detection group alone can effectively cover the entire area of ​​the cable well. By reasonably setting the grouping interval, the real-time monitoring of the operating status of the cable well and its internal ambient temperature can be achieved while reducing the working time of the standby detection group. The setting of the temperature safety threshold takes into account the changes in the actual ambient temperature, and it can be flexibly adjusted according to the actual ambient temperature, thereby reducing erroneous activation events caused by abnormal temperature and improving the safety and reliability of the monitoring method.

[0047] Fourth embodiment See also Figure 3 In a specific embodiment, controlling the temperature difference sensor to switch between the power saving mode and the activation mode according to the internal environment temperature and the temperature safety threshold specifically includes: S231, obtaining the highest internal environment temperature in the target detection group according to the temperature difference sensor, and recording it as the highest internal temperature; S232, when the highest internal temperature is greater than or equal to the temperature safety threshold, the standby detection group switches from the power saving mode to the activation mode; S233: When the highest internal temperature is lower than the temperature safety threshold, the standby detection group maintains the power saving mode and determines whether the power saving mode needs to be switched to the activation mode according to the actual environment data.

[0048] In steps S231 to S233, the highest internal temperature refers to the highest temperature value monitored among all internal ambient temperatures obtained by the temperature difference sensor within the set monitoring period. Through the initial operation of the temperature difference sensor in the target detection group, the reading of each temperature difference sensor can be obtained, thereby determining the highest internal temperature of the cable well at this time. When the highest internal temperature is greater than or equal to the temperature safety threshold, the standby detection group directly switches to the activation mode. When the highest internal temperature is less than the temperature safety threshold, it is necessary to consider the possibility of special circumstances in the actual environment and determine whether it is necessary to switch the standby detection group to the activation mode.

[0049] The acquisition of the maximum internal temperature provides accurate data support for the subsequent switching of the working mode of the standby detection group. By monitoring the maximum internal temperature, the standby detection group can maintain power saving mode operation under temperature safety conditions, extending its service life. The standby detection group can also be started in time when the temperature is abnormal to ensure the safe operation of the cable line.

[0050] Fifth embodiment See also Figure 3 In a specific embodiment, when the highest internal temperature is less than the temperature safety threshold, the standby detection group maintains the power saving mode and determines whether the power saving mode needs to be switched to the activation mode according to the actual environment data, specifically including: S233a, predicting the future current load within the target time period based on the historical current load of the cable well, and calculating the compensation coefficient based on the future external temperature and the future current load; S233b, calculating the actual maximum internal temperature of the target detection group according to the compensation coefficient and the maximum internal temperature; S233c: Determine whether the standby detection group needs to switch from the power saving mode to the activation mode based on the actual maximum internal temperature and the temperature safety threshold.

[0051] In step S233a and step S233b, it should be noted that when the actual maximum internal temperature is greater than or equal to the temperature safety threshold, the standby detection group needs to switch to the activation mode. When the actual maximum internal temperature is less than the temperature safety threshold, the standby detection group maintains the power saving mode and determines whether the power saving mode needs to be switched to the activation mode based on the theoretical maximum temperature. Sudden changes in future current loads will have a certain impact on the internal temperature of the cable well, but the heat changes caused by current changes usually require a certain response time, resulting in the maximum value of the internal temperature of the cable well not immediately changing with the change of current load. Therefore, this response time can be converted into a corresponding current load value, and a future current load based on the time difference is calculated. The specific calculation formula is: .

[0052] in, E f is the future current load, in A, E h,i is the actual current load in the i-th historical time period, in A, and n is the number of time periods. W i is the weight of the target time period. When the time period is at the peak of electricity consumption every year or every day, W i The value of t increases accordingly. 1 The thermal response time indicates the response time required for the maximum internal temperature to change after the current load of cables of different materials changes. The unit is s. is the difference before and after the current load changes, in A. It is the time from before the current load changes to after the change, in seconds.

[0053] The compensation coefficient refers to a key parameter for correcting or adjusting the maximum internal temperature under special environmental conditions. The use of the compensation coefficient can significantly improve the accuracy of the monitoring method, and avoid the situation where the working state of the standby detection group is still switched according to the original maximum internal temperature when the maximum internal temperature changes under special environmental conditions, resulting in the standby detection group being unable to be activated in time and effectively monitored. Special environmental conditions include cliff-like changes in temperature and current load. At this time, the maximum internal temperature of the cable well will also be significantly affected, which may cause its operation failure. Therefore, the standby detection group needs to be specially activated. The real-time calculation of the compensation coefficient can dynamically correct the maximum internal temperature according to environmental changes, so that the standby detection group can quickly switch to the activation mode when dealing with drastic fluctuations in temperature and current load, avoiding monitoring failure due to the lag of the reference maximum internal temperature value. The specific calculation formula of the compensation coefficient and the actual maximum internal temperature is as follows: ; .

[0054] in, C is the compensation coefficient, T 1 is the actual maximum internal temperature in °C. T 2 is the maximum internal temperature in °C.

[0055] In step S233c, it should be noted that when the actual maximum internal temperature is greater than or equal to the temperature safety threshold, the standby detection group needs to switch to the activation mode. When the actual maximum internal temperature is lower than the temperature safety threshold, the standby detection group maintains the power saving mode and determines whether the power saving mode needs to be switched to the activation mode based on the theoretical maximum temperature.

[0056] The future current load calculation takes into account the thermal response time required for current load changes, significantly improving the accuracy of the temperature difference sensor's monitoring of cable well temperature changes, thereby achieving forward-looking monitoring of cable well temperature, avoiding passive activation of the standby detection group only when the temperature is overheated, and improving the reliability and safety of the monitoring method. The setting of the compensation coefficient takes into account special environmental conditions, such as the impact of factors such as drastic temperature fluctuations and sudden changes in current load on the monitoring system. By reasonably setting the compensation coefficient, the actual maximum internal temperature under special environments can be predicted, effectively avoiding delayed switching of the standby detection group's working state due to environmental changes, and ensuring that the standby detection group can respond quickly and conduct effective monitoring under abnormal conditions, thereby improving the accuracy and reliability of the monitoring method.

[0057] Sixth embodiment See also Figure 4In a specific embodiment, predicting the theoretical maximum temperature in the target area according to the first temperature result, and judging whether the power saving mode needs to be switched to the activation mode according to the theoretical maximum temperature, specifically includes: S510, predicting the theoretical maximum temperature of the target detection group in the target area according to the grouping interval and the first temperature result; S520, when the theoretical maximum temperature is less than the temperature safety threshold, the standby detection group maintains the power saving mode; S530: When the theoretical maximum temperature is greater than or equal to the temperature safety threshold, control the standby detection group to switch from the power saving mode to the activation mode.

[0058] In step S510 to step S530, the prediction of the theoretical maximum temperature in the target detection group helps to improve the monitoring method. When the maximum internal temperature obtained by the target detection group in the cable well according to the temperature difference sensor reading is less than the temperature safety threshold, and the standby detection group does not need special activation, the standby detection group is in power saving mode. However, since the initial installation method of the temperature difference sensor is equidistant installation, its installation position may not cover all key areas in the cable well. Some areas may produce higher temperatures due to heat accumulation or local poor heat dissipation. However, since the detectors are not arranged in these areas, the maximum temperature reading at this time deviates from the theoretical maximum temperature. Therefore, it is necessary to predict the theoretical maximum temperature. Based on the comparison between the theoretical maximum temperature and the temperature safety threshold, it is determined whether the standby detection group needs to switch to the activation mode. If the theoretical maximum temperature is close to or reaches the temperature safety threshold, and the actual maximum internal temperature does not reach this threshold, relying solely on the maximum internal temperature reading may cause the standby detection group to fail to be activated in time, increasing potential safety hazards. In this case, by predicting the theoretical maximum temperature, it is possible to effectively determine whether the standby detection group needs to be switched to the activation mode to avoid the risk of overtemperature in the cable well, while saving energy and extending the service life of the temperature difference sensor.

[0059] By calculating the theoretical maximum temperature, the working mode of the standby detection group can be effectively managed. When the theoretical maximum temperature is lower than the temperature safety threshold, maintaining the power-saving mode helps save energy and extend the service life of the temperature difference sensor. When the theoretical maximum temperature is higher than the temperature safety threshold, the standby detection group is switched to the activation mode in time, which helps to improve the monitoring capability of the temperature difference sensor, ensure the real-time and accuracy of the monitoring data, and help prevent failures and safety accidents caused by overheating of the cable well.

[0060] Seventh embodiment See also Figure 4 In a specific embodiment, predicting the theoretical maximum temperature of the target detection group in the target area according to the grouping interval and the first temperature result specifically includes: S511, according to the grouping interval, sequentially obtain the temperature difference values ​​between two adjacent temperature difference sensors in the target detection group, and determine the temperature change trend of the cable well in the target direction according to the temperature difference values ​​to obtain a first change trend; S512, when the first change trend changes from an upward trend to a downward trend, marking the changed internal environment temperature as a turning temperature; S513, when there is only one transition temperature, the internal environment temperature adjacent to the transition temperature is recorded as the comparison temperature; when the two comparison temperatures are the same, the theoretical maximum temperature is equal to the transition temperature; when the two comparison temperatures are different, the two comparison temperatures are compared to obtain a first comparison result, and the theoretical maximum temperature of the target detection group is calculated according to the future current load and the first comparison result; S514. When there are multiple transition temperatures, the maximum value of the comparison temperature is screened out and recorded as the maximum temperature value, and the theoretical maximum temperature is calculated based on the transition temperature corresponding to the maximum temperature value.

[0061] In step S511, the target direction is the same as the arrangement direction of the cables in the cable well, which means that the temperature changes monitored by the temperature difference sensor are consistent with the actual direction of the cable line, which helps to improve the accuracy of the temperature change trend analysis. The target detection group and the backup detection group are arranged along the target direction, and through the set grouping interval, the monitoring area of ​​the target detection group can be divided into multiple independent sub-areas. The data of the target detection group in each sub-area is calculated separately without interfering with each other. In the target detection group, the temperature difference values ​​between adjacent temperature difference sensors need to be calculated to obtain the first change trend of the readings of each temperature difference sensor in the target direction.

[0062] In step S512, the first change trend is also divided into an upward trend and a downward trend. When the temperature difference value is greater than 0, the first change trend is an upward trend. When the temperature difference value is less than 0, the first change trend is a downward trend. When the temperature difference value is equal to 0, the original change trend is maintained, that is, the change trend of the previous temperature difference sensor reading is an upward trend, and the change trend of the temperature detection point with a temperature difference value of 0 is also an upward trend. Any three consecutive temperature difference sensors are read one by one in the target direction. If the middle reading is an upward trend relative to the previous reading and a downward trend relative to the subsequent reading, the temperature difference sensor reading is marked as a turning temperature.

[0063] For example, when the grouping interval is 3m, the target detection group and the backup detection group are both set at an interval of 3m. If the grouping method at this time is that numbers 0, 1 and 2 are a subgroup of the target detection group, and 6, 7, 8 are a subgroup of the target detection group, and they are rotated in turn, and the three consecutive temperature difference sensors numbered 0, 1 and 2 in the target direction are taken for readings. The reading of temperature difference sensor 0 is D℃, the reading of temperature difference sensor 1 is 1.07D℃, and the reading of temperature difference sensor 2 is 1.03D℃. At this time, the reading of temperature difference sensor 1 is marked as the turning temperature.

[0064] In step S513, taking the data in step S512 as an example, the theoretical maximum temperature of the target detection group is calculated based on the transition temperature of 1.07D°C at this time. When there is only one transition temperature, the theoretical maximum temperature at this time is between the transition temperature and two adjacent comparison temperatures. The distance between the transition temperature and any adjacent comparison temperature is recorded as L , the heating efficiency of the cable line is recorded as N , heating efficiency and future current load E f The relationship is as follows: E f,i ÷ When ≤0.5, N =1; 0.5< E f,i ÷ When ≤1, N =1.01; 1< E f,i ÷ hour, N =1.02.

[0065] in, E f,i is the future current load in the i-th time period, in A, It is the average value of current load during the target time period.

[0066] The transition temperature is 1.07D℃, and the heating efficiency is N If the two comparison temperatures are equal and both are 1.03D℃, the transition temperature value is equal to the theoretical maximum temperature, that is, the theoretical maximum temperature is 1.07D℃. If the two comparison temperature values ​​are 0.55D℃ and 0.33D℃ respectively, the first comparison result is 0.22D℃. At this time, the theoretical maximum temperature T m It should be between the comparison temperature and the transition temperature of 0.74D℃. T mThe distance from the comparison temperature of 0.74D℃ is recorded as H 1 , and the distance from the transition temperature is recorded as H 2 , according to the calculation: 0.55D= L ; H 1 + H 2 = L ; H 1 - H 2 =0.33D; That is, D=1 L , H 1 =0.44 L , H 2 =0.11 L , T m =1.07D+0.11×0.55 L ×1.01=1.131D℃.

[0067] In step S514, when the grouping intervals are different, there may be multiple transition temperatures. At this time, the two temperature difference sensor readings corresponding to each transition temperature are compared to obtain the maximum value of the comparison temperature. Subsequently, the transition temperature corresponding to the maximum temperature value is calculated according to the steps in step S513 to step S514 to obtain the theoretical maximum temperature.

[0068] It should be noted that the setting of the temperature safety threshold is closely related to the actual ambient temperature of the cable well. When the theoretical maximum temperature exceeds the temperature safety threshold, it does not mean that there must be a thermal fault point in the cable well. The theoretical maximum temperature can be used as an important reference indicator to help staff evaluate the comprehensive status of the cable well and decide whether maintenance is needed.

[0069] The setting of grouping interval not only improves the precision of data analysis, but also more accurately reflects the temperature changes of the cable wells in each monitoring area, which helps to timely discover potential fault hazards. The setting of turning temperature helps to timely identify the key nodes of cable well temperature changes, which helps to calculate the theoretical maximum temperature and reduce the error in calculating the theoretical maximum temperature. The calculation of heating efficiency takes into account the impact of future current load on the theoretical maximum temperature, so as to better reflect the theoretical maximum temperature of the cable line under future current load, and further improve the accuracy of the theoretical maximum temperature calculation. The setting of the maximum temperature value allows the maximum comparison temperature to be preferentially screened out when there are multiple turning temperatures in the target detection group, thereby improving the calculation efficiency of the theoretical maximum temperature and its safety and reliability.

[0070] Eighth embodiment See also Figure 1 In a specific embodiment, adjusting the switching threshold of the standby detection group under different actual environmental data according to the theoretical maximum temperature and the corrected maximum temperature specifically includes: S710: When the corrected maximum temperature is greater than or equal to the theoretical maximum temperature, the temperature safety threshold has a second correction coefficient at the corresponding internal ambient temperature; S720: When the corrected maximum temperature is greater than the temperature safety threshold and less than the theoretical maximum temperature, the temperature safety threshold does not need to be adjusted; S730: When the corrected maximum temperature is less than or equal to the temperature safety threshold, the temperature safety threshold has a third correction coefficient at the corresponding internal ambient temperature.

[0071] In step S710, the corrected maximum temperature refers to the value obtained by correcting the theoretical maximum temperature in combination with the actually obtained second temperature result, and obtaining the maximum value in the second temperature result. T 3 , calculate the corrected maximum temperature T c , the formula is as follows: .

[0072] when T c ≥ T m When the corrected maximum temperature is greater than or equal to the temperature safety domain value, it means that the standby detection group does not need to switch to the activation mode. At this time, the standby detection group has been activated incorrectly and should be activated according to the maximum temperature in the second temperature result. T 3 And temperature safety threshold T s , calculate the second correction coefficient k 2 , the temperature safety threshold Ts Adjust upward and record it as the first temperature safety domain value T s1 , the calculation formula is: ; .

[0073] In step S720, when T s < T c ≤ T m , it indicates that the standby detection group needs to be switched to the activation mode. At this time, the temperature safety domain value does not need to be adjusted.

[0074] In step S730, when T c ≤ T s When the standby detection group does not need to switch to the activation mode, the standby detection group has been activated incorrectly and should be activated according to the highest temperature of the first temperature result. T 2 And temperature safety threshold T s , calculate the third correction factor k 3 , the temperature safety threshold T s Adjust downward and record it as the second temperature safety threshold T s2 , the calculation formula is: ; .

[0075] For example, when the temperature safety threshold is 65°C, the theoretical maximum temperature is 55°C, and the maximum value of the second temperature result is 60°C, the calculated corrected maximum temperature is 50.42°C, which meets the T c ≤ T s When the highest internal temperature in the first result is 63°C, the value of the third correction coefficient is -0.031, and the second temperature safety domain value is 62.99°C, which is lower than the original temperature safety domain value; the temperature safety domain value remains unchanged. When the theoretical maximum temperature is 70°C, the maximum value in the second temperature result is 67°C, and the corrected maximum temperature is 73.13°C, which meets the requirements. T c ≥ T mIn this case, the calculated value of the second correction coefficient is 0.031, and the first temperature safety domain value is 67.02℃, which is increased compared with the original temperature safety domain value.

[0076] The calculation of the second correction coefficient and the third correction coefficient takes into account the possible difference in the maximum temperature obtained by the target detection group and the standby detection group, and analyzes the impact of this difference on the temperature safety threshold. By dynamically correcting the temperature safety threshold, it is ensured that the standby detection group has a more scientific and accurate switching threshold when switching, and prevents the standby detection group from being frequently erroneously activated due to improper setting of the temperature safety threshold. At the same time, the overall operating efficiency of the temperature difference detection group is improved. In addition, the optimized temperature safety threshold helps to extend the service life of the temperature difference detection group, reduce the maintenance and replacement costs caused by frequent activation, and ensure the stability and reliability of the temperature difference detection group in different working environments.

[0077] Ninth embodiment See also Figure 5 In a specific embodiment, the present invention also provides a cable well status comprehensive monitoring system 100, in which the cable well status comprehensive monitoring method recorded in the above embodiment is applied to the monitoring system 100, and the monitoring system 100 includes: a monitoring module 110, the monitoring module 110 is used to monitor the actual environmental data in the cable well; a calculation module 120, the calculation module 120 is used to calculate the theoretical maximum temperature; a storage module 130, the storage module 130 is used to store the switching threshold; a judgment module 140, the judgment module 140 is used to judge whether the standby detection group needs to switch to the activation mode according to the actual environmental data. The monitoring system has all the technical features of the above monitoring method, which will not be repeated here one by one.

[0078] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A comprehensive monitoring method for cable well status, characterized in that: The cable well status comprehensive monitoring method comprises: Acquire internal environmental data of the cable well through a temperature difference sensor, and calculate actual environmental data in the cable well according to the internal environmental data and first external environmental data of the target area; Dividing the temperature difference sensor into a plurality of temperature difference detection groups, and controlling the temperature difference sensor to switch between a power saving mode and an activation mode according to the internal environment data; The temperature difference detection group in the activation mode is recorded as a target detection group, and the temperature difference detection group in the power saving mode is recorded as a standby detection group; Obtaining the temperature value of each of the temperature difference sensors in the standby detection group to obtain a first temperature result; Predicting a theoretical maximum temperature in the target area according to the first temperature result, and determining whether the power saving mode needs to be switched to the activation mode according to the theoretical maximum temperature; If yes, the theoretical maximum temperature is corrected according to the temperature value of each temperature difference sensor in the target detection group to obtain a corrected maximum temperature; The switching threshold of the standby detection group under different actual environmental data is adjusted according to the theoretical maximum temperature and the corrected maximum temperature.

2. The cable well status comprehensive monitoring method according to claim 1 is characterized in that: The step of obtaining the internal environment data of the cable well through the temperature difference sensor and calculating the actual environment data in the cable well according to the internal environment data and the first external environment data of the target area specifically includes: Determine a first external environment temperature according to the first external environment data, and obtain the internal environment temperature of the cable well according to the temperature difference sensor; Calculating a first correction coefficient according to the first external environment temperature and the internal environment temperature; Obtaining the future outside temperature of the target area where the cable well is located according to the weather forecast; The actual environmental data of the cable well within a target time period is calculated according to the first correction coefficient and the future external temperature.

3. The cable well status comprehensive monitoring method according to claim 2 is characterized in that: The dividing the temperature difference sensor into a plurality of temperature difference detection groups and controlling the temperature difference sensor to switch between a power saving mode and an activation mode according to the internal environment data specifically includes: Distribute the temperature difference sensors equidistantly on the cable line in the cable well, number each temperature difference sensor, set a grouping interval, and divide the temperature difference sensors into a plurality of temperature difference detection groups according to the numbers; Obtaining the actual ambient temperature according to the temperature difference detection group, and determining a temperature safety threshold according to the actual ambient temperature; The temperature difference sensor is controlled to switch between the power saving mode and the activation mode according to the internal environment temperature and the temperature safety threshold.

4. The cable well status comprehensive monitoring method according to claim 3 is characterized in that: The controlling the temperature difference sensor to switch between the power saving mode and the activation mode according to the internal environment temperature and the temperature safety threshold specifically includes: Acquire the highest internal environment temperature in the target detection group according to the temperature difference sensor, and record it as the highest internal temperature; When the maximum internal temperature is greater than or equal to the temperature safety threshold, the standby detection group switches from the power saving mode to the activation mode; When the maximum internal temperature is lower than the temperature safety threshold, the standby detection group maintains the power saving mode and determines whether the power saving mode needs to be switched to the activation mode according to the actual environment data.

5. The cable well status comprehensive monitoring method according to claim 4 is characterized in that: When the maximum internal temperature is less than the temperature safety threshold, the standby detection group maintains the power saving mode, and determines whether the power saving mode needs to be switched to the activation mode according to the actual environment data, specifically including: Predicting the future current load within the target time period based on the historical current load of the cable well, and calculating the compensation coefficient based on the future outside temperature and the future current load; Calculating the actual maximum internal temperature of the target detection group according to the compensation coefficient and the maximum internal temperature; According to the actual maximum internal temperature and the temperature safety threshold, it is determined whether the standby detection group needs to be switched from the power saving mode to the activation mode.

6. The cable well status comprehensive monitoring method according to claim 5 is characterized in that: The predicting the theoretical maximum temperature in the target area according to the first temperature result, and judging whether the power saving mode needs to be switched to the activation mode according to the theoretical maximum temperature, specifically includes: Predicting the theoretical maximum temperature of the target detection group in the target area according to the grouping interval and the first temperature result; When the theoretical maximum temperature is less than the temperature safety threshold, the standby detection group maintains the power saving mode; When the theoretical maximum temperature is greater than or equal to the temperature safety threshold, the standby detection group is controlled to switch from the power saving mode to the activation mode.

7. The cable well status comprehensive monitoring method according to claim 6, characterized in that: Predicting the theoretical maximum temperature of the target detection group in the target area according to the grouping interval and the first temperature result specifically includes: According to the grouping interval, the temperature difference values ​​between two adjacent temperature difference sensors in the target detection group are obtained in sequence, and the temperature change trend of the cable well in the target direction is determined according to the temperature difference values ​​to obtain a first change trend; When the first change trend changes from an upward trend to a downward trend, marking the internal environment temperature at which the change occurs as a turning temperature; When there is only one transition temperature, the internal environment temperature adjacent to the transition temperature is recorded as the comparison temperature; When the two comparison temperatures are the same, the theoretical maximum temperature is equal to the transition temperature; When the two comparison temperatures are different, comparing the two comparison temperatures to obtain a first comparison result; Calculating the theoretical maximum temperature of the target detection group according to the future current load and the first comparison result; When there are multiple transition temperatures, the maximum value of the comparison temperatures is screened out and recorded as the maximum temperature value, and the theoretical maximum temperature is calculated based on the transition temperature corresponding to the maximum temperature value.

8. The cable well status comprehensive monitoring method according to claim 7, characterized in that: The step of adjusting the switching threshold of the standby detection group under different actual environment data according to the theoretical maximum temperature and the corrected maximum temperature specifically includes: When the corrected maximum temperature is greater than or equal to the theoretical maximum temperature, the temperature safety threshold has a second correction coefficient at the corresponding internal ambient temperature; When the corrected maximum temperature is greater than the temperature safety threshold and less than the theoretical maximum temperature, the temperature safety threshold does not need to be adjusted; When the corrected maximum temperature is less than or equal to the temperature safety threshold, the temperature safety threshold has a third correction coefficient at the corresponding internal ambient temperature.

9. A cable well status comprehensive monitoring system, characterized in that: The cable well status comprehensive monitoring method according to any one of claims 1 to 8 is applied to the monitoring system, and the monitoring system comprises: A monitoring module, the monitoring module is used to monitor the actual environmental data in the cable well; A calculation module, the calculation module is used to calculate the theoretical maximum temperature; A storage module, the storage module is used to store the switching threshold; A judgment module is used to judge whether the standby detection group needs to switch to the activation mode according to the actual environment data.

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