Method and system for monitoring dynamic capacity increasing temperature of power transmission line

Abstract

The application provides a power transmission line dynamic capacity-increasing temperature monitoring method and a monitoring system, wherein the method comprises the following steps: 1) obtaining the power transmission line surface temperature field distribution in the circumferential direction of the power transmission line under the current transmission capacity based on a temperature monitoring device installed on the power transmission line; 2) inputting the capacity-increasing amount into the control system through the input end, inputting the capacity-increasing amount into a capacity-increasing monitoring model by the control system, judging whether the temperature field distribution in the circumferential direction of the power transmission line caused by the capacity-increasing amount exceeds a set threshold value based on the capacity-increasing monitoring model, if the temperature field distribution exceeds the set threshold value, the capacity-increasing monitoring model sends a warning to the control system, and the capacity-increasing action is not performed, if the temperature field distribution does not exceed the set threshold value, a safe capacity-increasing instruction is sent to the control system, and the control system performs interval type step-by-step capacity-increasing in the set capacity-increasing unit amount according to the safe capacity-increasing instruction, and reaches the set capacity-increasing amount.

Description

Technical Field

[0001] This invention relates to the field of power transmission technology, specifically a method and system for monitoring the dynamic capacity expansion temperature of power transmission lines. Background Technology

[0002] Dynamic capacity expansion of power lines involves online monitoring of conductor temperature and local ambient temperature, and based on data collected on-site and various criteria affecting the safe operation of transmission lines, calculating and determining the current steady-state transmission capacity limit of the line in real time, thereby increasing the transmission capacity of the line.

[0003] Existing publicly available technologies also focus on the natural convection of power transmission lines, using the surface and surrounding temperature field of the transmission line as the primary research object, thereby obtaining the temperature field around the transmission line. For example, publication number "CN106225942A" discloses a method for measuring the natural convection temperature field of overhead transmission lines using a wheel-shaped thermocouple cluster fixed by a split bearing driven by a stepper motor. The method mainly includes the following steps: S1, assembling several thermocouples into a wheel-shaped thermocouple cluster and uniformly fixing it on a split bearing driven by a stepper motor. The distance between the temperature-sensing contact of each thermocouple and the conductor is not uniform, used to measure the thermal field temperature at different distances from the conductor. S2, after the outer ring of the split bearing rotates around the conductor once in a certain period, the temperature distribution at a specified location and distance around the conductor is obtained. This invention comprehensively considers various knowledge such as the temperature field distribution of overhead power lines, measurement technology, and engineering thermophysics, enabling relatively accurate measurement of the temperature field distribution around the overhead line while minimizing disruption to its original temperature distribution.

[0004] Because air is not a complete insulator, thermocouples, due to their excellent conductivity, may form a circuit with the high-voltage transmission line during high-voltage power transmission, potentially damaging the temperature measuring device and affecting temperature acquisition. Summary of the Invention

[0005] In view of this, the main objective of the present invention is to provide a method and system for monitoring the dynamic capacity expansion temperature of transmission lines.

[0006] The technical solution adopted in this invention is as follows:

[0007] This application discloses a method for monitoring the temperature during dynamic capacity expansion of transmission lines, comprising the following steps:

[0008] 1) Obtain the surface temperature field distribution of the transmission line in the circumferential direction under the current transmission capacity by using a temperature monitoring device installed on the transmission line;

[0009] 2) The increased capacity is input to the control system from the input terminal. The control system inputs the increased capacity to the increased capacity monitoring model. Based on the increased capacity monitoring model, it determines whether the temperature field distribution around the transmission line caused by the increased capacity exceeds the set threshold. If the set threshold is exceeded, the increased capacity monitoring model issues a warning to the control system and does not perform the increased capacity action. If the set threshold is not exceeded, a safe increased capacity command is sent to the control system. The control system then performs a gradual, intermittent increased capacity according to the safe increased capacity command at the set increased capacity unit amount until the set increased capacity is reached.

[0010] In step 2), during the process of gradually increasing the capacity in intervals according to the safety increase command, the control system uses a temperature monitoring device to measure the temperature distribution data after each increase, and makes a second judgment based on the temperature distribution data to determine whether the set threshold has been exceeded.

[0011] Furthermore, the capacity expansion monitoring model is obtained according to the following method:

[0012] 1) Obtain the surface temperature field distribution of the transmission line in the circumferential direction under the current transmission capacity;

[0013] 2) The transmission capacity is increased multiple times at set intervals according to a set unit amount. Based on the temperature monitoring device installed on the transmission line, the actual temperature at multiple points around the transmission line after each capacity increase is measured to obtain the second temperature distribution N around the transmission line after each capacity increase. i , where i is the sequence number set according to the order of capacity expansion, and i is an integer greater than or equal to 3;

[0014] 3) Based on the second temperature distribution N i The actual temperature at each point is compensated by a compensation module to form a second temperature field distribution N along the circumference of the transmission line. j , where j is the set index relative to i, and j is an integer greater than or equal to 3;

[0015] 4) The surface temperature field distribution of the transmission line and the second temperature field distribution N j The data is input into a machine learning system and iteratively trained to form a capacity expansion monitoring model.

[0016] This application also provides a dynamic capacity expansion temperature monitoring system for transmission lines, including:

[0017] Power transmission lines;

[0018] Control system; installed in the host computer;

[0019] The input terminal is used to input the required capacity increase to the control system.

[0020] The control system is equipped with a capacity increase monitoring model. Based on the capacity increase monitoring model, it is determined whether the temperature field distribution around the transmission line caused by the capacity increase exceeds a set threshold. If the set threshold is exceeded, the capacity increase monitoring model issues a warning to the control system and does not perform the capacity increase action. If the set threshold is not exceeded, a safe capacity increase command is sent to the control system, and the control system performs intermittent and gradual capacity increase according to the safe capacity increase command with a set capacity increase unit amount until the set capacity increase is reached.

[0021] The transmission line is equipped with a temperature monitoring device, which is used to acquire temperature distribution data around the transmission line.

[0022] Furthermore, the temperature monitoring device includes:

[0023] A U-shaped clamp made of silicon carbide ceramic, wherein the upper half of the clamp is a parallel slot and a semi-circular groove integrally formed with the slot is provided along the lower half of the slot.

[0024] Multiple grooves are formed on the inner wall of the semi-circular slot, and surface acoustic wave temperature probes are sequentially arranged in the multiple grooves.

[0025] Multiple evenly arranged elastic components are provided on the inner walls on both sides of the slot;

[0026] Multiple measuring plates are set along the fixture, and multiple temperature sensors are evenly arranged on each measuring plate.

[0027] A first fixing block and a second fixing block are respectively provided on both sides of the clamp. The first fixing block has a first opening arranged horizontally and the first opening passes through the first fixing block. The second fixing block has a second opening and the second opening is set so that it does not pass through the second fixing block. The first opening and the second opening are on the same axis.

[0028] During installation, align the slot with the lower part of the power transmission line, and install the power transmission line inside the clamp from bottom to top through the slot, with the power transmission line in contact with the semi-circular slot; the upper part of the power transmission line is clamped by the elastic component.

[0029] A pin is inserted from the first opening into the second opening to lock the upper part of the slot.

[0030] Furthermore, the resilient component includes:

[0031] An installation groove is formed along the inner wall of the groove. The installation groove has a first groove body and a second groove body, and the cross-sections of the first groove body and the second groove body are both rectangular; and the second groove body is larger than the first groove body.

[0032] A spring is fixed to the inner wall of the second groove. A limit block is set at the outer end of the spring and inside the second groove. A docking plug is set in the middle of the limit block.

[0033] A movable block has a slot on one side, and a plug is fixed in the slot, so that the limiting block and the movable block are fixed together; after the movable block is fixed to the limiting block, an elastic point for fixing the transmission line is formed in the slot.

[0034] The exposed portion of the movable block has an upper inclined surface and a lower inclined surface on its upper part. When installing with the power transmission line, the slot is aligned with the lower part of the power transmission line, and the power transmission line is installed from bottom to top through the slot. When the power transmission line contacts the elastic component, the power transmission line presses against the upper inclined surface on the movable block, causing the movable block to slide inward and compress the spring to fix the power transmission line in the clamp.

[0035] Furthermore, a communication device is provided below the first fixing block or the second fixing block;

[0036] The communication device includes: a housing, an interior cavity, and at least two partitions disposed within the cavity.

[0037] The partition is equipped with a communication board, controller, and battery device;

[0038] The battery device is connected to the communication board and the controller; the controller is connected to the communication board, which is equipped with a receiver, a WiFi module and a GSM / CDMA / GPRS module or a 4G / 5G network module.

[0039] Bottom cover mounting grooves are provided on both sides of the shell, and a limit body is provided at the rear end of the bottom cover mounting groove;

[0040] The bottom cover has fitting plates on both sides and evenly spaced through holes.

[0041] Furthermore, the controller is used to set the data acquisition cycle of the surface acoustic wave temperature probe and the temperature sensor;

[0042] The receiver is used to connect to the surface acoustic wave temperature probe, which is used to obtain the surface temperature of the transmission line.

[0043] The WiFi module is used to connect to the temperature sensor; the temperature sensor is used to acquire temperature distribution data of the circumferential temperature field of the transmission line.

[0044] The GSM / CDMA / GPRS module or 4G / 5G network module is used to communicate with the host computer.

[0045] Furthermore, the method for obtaining the surface temperature of the transmission line using the surface acoustic wave temperature probe is as follows:

[0046] 1) The controller sends acquisition commands to the surface acoustic wave temperature probe via the receiver according to the set cycle; and generates an electromagnetic signal based on the acquisition commands;

[0047] 2) The surface acoustic wave temperature probe receives electromagnetic signals and inputs them into the control unit of the surface acoustic wave temperature probe. In the control unit, surface acoustic waves are excited through the inverse piezoelectric effect. The spectral characteristics of the surface acoustic waves during propagation are related to the current temperature.

[0048] 3) An echo electromagnetic signal is generated in the surface acoustic wave temperature probe through the piezoelectric effect. The echo electromagnetic signal is transmitted from the surface acoustic wave temperature probe to the controller. The controller filters, converts, and analyzes the waveform of the echo electromagnetic signal to obtain the surface temperature of the transmission line.

[0049] Furthermore, the control system includes:

[0050] The machine learning system includes:

[0051] The configuration module is used to configure the actual coordinates of each temperature sensor based on the actual distance between each temperature sensor and the transmission line.

[0052] The association module is used to associate each temperature sensor and each surface acoustic wave temperature probe with the configuration module and form an association configuration table.

[0053] The capacity expansion monitoring model is set in the machine learning system. The capacity expansion monitoring model obtains the actual temperature of each point based on the association configuration table, and obtains the temperature distribution status of the transmission line circumferentially based on the actual temperature of each point.

[0054] Each point is set according to the actual distance between each temperature sensor and each surface acoustic wave temperature probe and the power transmission line.

[0055] This application uses a surface acoustic wave (SAW) temperature probe, which is passive and wireless, and can directly collect the temperature of the power transmission line surface, making it more reliable and safer.

[0056] This application constructs a temperature monitoring device equipped with multiple temperature sensors. The actual temperature at different locations along the circumference of the transmission line can be measured using each temperature sensor, and the circumferential temperature distribution of the transmission line can be obtained based on the measured actual temperature. Attached Figure Description

[0057] The following figures are for illustrative purposes only and are not intended to limit the scope of the invention, wherein:

[0058] Figure 1This is a flowchart of the method of the present invention;

[0059] Figure 2 This is a flowchart illustrating the method for forming the capacity expansion monitoring model in this invention;

[0060] Figure 3 This is a flowchart of the method for obtaining the surface temperature of a power transmission line using a surface acoustic wave temperature probe in this invention.

[0061] Figure 4 This is a schematic diagram of the temperature monitoring device in this invention;

[0062] Figure 5 This is a schematic diagram of the structure of the elastic component in this invention;

[0063] Figure 6 This is a schematic diagram illustrating the framework principle of the communication module in this invention;

[0064] Figure 7 This is a schematic diagram simulating the temperature field of the transmission line in this invention. Detailed Implementation

[0065] To make the objectives, technical solutions, design methods, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0066] Example 1

[0067] Reference Figure 1 , 2 3, 4, This application discloses a method for monitoring the temperature during dynamic capacity expansion of transmission lines, comprising the following steps:

[0068] 1) Obtain the surface temperature field distribution of the transmission line in the circumferential direction under the current transmission capacity by using a temperature monitoring device installed on the transmission line;

[0069] 2) The increased capacity is input to the control system from the input terminal. The control system inputs the increased capacity to the increased capacity monitoring model. Based on the increased capacity monitoring model, it determines whether the temperature field distribution around the transmission line caused by the increased capacity exceeds the set threshold. If the set threshold is exceeded, the increased capacity monitoring model issues a warning to the control system and does not perform the increased capacity action. If the set threshold is not exceeded, a safe increased capacity command is sent to the control system. The control system then performs a gradual, intermittent increased capacity according to the safe increased capacity command at the set increased capacity unit amount until the set increased capacity is reached.

[0070] In step 2), during the process of gradually increasing the capacity in intervals according to the safety increase command, the control system uses a temperature monitoring device to measure the temperature distribution data after each increase, and makes a second judgment based on the temperature distribution data to determine whether the set threshold has been exceeded.

[0071] In the above, the capacity expansion monitoring model is obtained according to the following method:

[0072] 1) Obtain the surface temperature field distribution of the transmission line in the circumferential direction under the current transmission capacity;

[0073] 2) The transmission capacity is increased multiple times at intervals according to a set unit amount. Based on the temperature monitoring device installed on the transmission line, the actual temperature of multiple points around the transmission line after each capacity increase is measured to obtain the second temperature distribution Ni around the transmission line after each capacity increase, where i is the sequence number set according to the order of capacity increase, and i is an integer greater than or equal to 3.

[0074] 3) Based on the second temperature distribution Ni, the actual temperature of each point is compensated by the compensation module to form the second temperature field distribution Nj in the circumference of the transmission line, where j is the set number relative to i, and j is an integer greater than or equal to 3.

[0075] 4) Input the surface temperature field distribution of the transmission line and the second temperature field distribution Nj into the machine learning system and perform iterative training to form a capacity expansion monitoring model.

[0076] In the above, the temperature monitoring device includes:

[0077] A U-shaped clamp made of silicon carbide ceramic, wherein the upper half of the clamp is a parallel slot and a semi-circular slot 100 integrally formed with the slot is provided along the lower half of the slot.

[0078] Multiple grooves are provided on the inner wall of the semi-circular slot, and surface acoustic wave temperature probes 102 are arranged in the multiple grooves in sequence.

[0079] Multiple evenly arranged elastic components 109 are provided on the inner walls on both sides of the slot;

[0080] Multiple measuring plates are set along the fixture, and multiple temperature sensors are evenly arranged on each measuring plate. (Refer to...) Figure 4Five measuring plates are installed on the fixture: a first measuring plate 103, a second measuring plate 104, a third measuring plate 105, a fourth measuring plate 106, and a fifth measuring plate 110. The first measuring plate 103 is located at the lower part of the semi-circular slot 100; the second measuring plate 104 is located on one side of the first movable block 107; the third measuring plate 105 is located on one side of the second measuring plate; the fourth measuring plate 106 is located on the upper part of the first movable block 107; and the fifth measuring plate 110 is located on the upper part of the second movable block. The first measuring plate 103, the second measuring plate 104, the third measuring plate 105, the fourth measuring plate 106, and the fifth measuring plate 110 are distributed along the circumference of the transmission line. Temperature sensors are installed on each of the first measuring plate 103, the second measuring plate 104, the third measuring plate 105, the fourth measuring plate 106, and the fifth measuring plate 110, allowing the temperature sensors to be deployed along the circumference of the transmission line for measuring temperature data at different locations along the circumference.

[0081] In the above, the control system includes:

[0082] The machine learning system includes:

[0083] The configuration module is used to configure the actual coordinates of each temperature sensor based on the actual distance between each temperature sensor and the transmission line.

[0084] The association module is used to associate each temperature sensor and each surface acoustic wave temperature probe with the configuration module and form an association configuration table.

[0085] The capacity expansion monitoring model is set in the machine learning system. The capacity expansion monitoring model obtains the actual temperature of each point based on the association configuration table, and obtains the temperature distribution status of the transmission line circumferentially based on the actual temperature of each point.

[0086] Each point is set according to the actual distance between each temperature sensor and each surface acoustic wave temperature probe and the power transmission line.

[0087] In the above, the method for obtaining the surface temperature of the transmission line using the surface acoustic wave temperature probe is as follows:

[0088] 1) The controller sends acquisition commands to the surface acoustic wave temperature probe via the receiver according to the set cycle; and generates an electromagnetic signal based on the acquisition commands;

[0089] 2) The surface acoustic wave temperature probe receives electromagnetic signals and inputs them into the control unit of the surface acoustic wave temperature probe. In the control unit, surface acoustic waves are excited through the inverse piezoelectric effect. The spectral characteristics of the surface acoustic waves during propagation are related to the current temperature.

[0090] 3) An echo electromagnetic signal is generated in the surface acoustic wave temperature probe through the piezoelectric effect. The echo electromagnetic signal is transmitted from the surface acoustic wave temperature probe to the controller. The controller filters, converts, and analyzes the waveform of the echo electromagnetic signal to obtain the surface temperature of the transmission line.

[0091] The principle of this application is as follows: This application uses a constructed capacity expansion monitoring model to determine whether the temperature field distribution around the transmission line caused by the capacity expansion exceeds a set threshold, thereby determining whether to carry out capacity expansion operations, or determining the appropriate capacity expansion size based on the current temperature field distribution of the transmission line; at the same time, this application installs temperature monitoring devices at different locations on the transmission line, and uses surface acoustic wave temperature probes and temperature sensors set on the temperature monitoring devices to measure the actual temperature on the surface of the transmission line and at different locations around the transmission line. Based on the measured actual temperature, the temperature distribution around the transmission line can be obtained, thereby performing secondary monitoring of the capacity expansion process.

[0092] The process of dynamic capacity expansion of transmission lines is as follows: The temperature field distribution around the transmission line is obtained through a temperature monitoring device. The control system then collects wind speed, wind direction, ambient temperature, and light radiation data in real time from meteorological and environmental monitoring devices set up near the temperature monitoring device. The control system analyzes the wind speed, wind direction, ambient temperature, light radiation data, and temperature field distribution around the transmission line in real time to calculate the maximum capacity that the line can transmit; or it uses a capacity expansion monitoring model to determine whether the temperature field distribution around the transmission line caused by the capacity expansion exceeds a set threshold.

[0093] Example 2

[0094] Reference Figure 1 , 3 4, 5, 6, 7, This application also provides a dynamic capacity expansion temperature monitoring system for transmission lines, comprising:

[0095] Power transmission lines;

[0096] Control system; installed in the host computer;

[0097] The input terminal is used to input the required capacity increase to the control system.

[0098] The control system is equipped with a capacity increase monitoring model. Based on the capacity increase monitoring model, it is determined whether the temperature field distribution around the transmission line caused by the capacity increase exceeds a set threshold. If the set threshold is exceeded, the capacity increase monitoring model issues a warning to the control system and does not perform the capacity increase action. If the set threshold is not exceeded, a safe capacity increase command is sent to the control system, and the control system performs intermittent and gradual capacity increase according to the safe capacity increase command with a set capacity increase unit amount until the set capacity increase is reached.

[0099] The transmission line is equipped with a temperature monitoring device, which is used to acquire temperature distribution data around the transmission line.

[0100] Furthermore, the temperature monitoring device includes:

[0101] A U-shaped clamp made of silicon carbide ceramic, the upper half of which is a parallel slot, and a semi-circular slot 100 integrally formed with the slot is provided along the lower half of the slot; in this application, the clamp is made entirely of silicon carbide ceramic, and because silicon carbide ceramic has excellent insulation properties, it can be directly installed on the surface of the power transmission line.

[0102] Multiple grooves are provided on the inner wall of the semi-circular slot, and surface acoustic wave temperature probes 102 are arranged in the multiple grooves in sequence.

[0103] Multiple evenly arranged elastic components 109 are provided on the inner walls on both sides of the slot;

[0104] Multiple measuring plates are set along the fixture, and multiple temperature sensors are evenly arranged on each measuring plate. (Refer to...) Figure 4 Five measuring plates are provided on the fixture: a first measuring plate 103, a second measuring plate 104, a third measuring plate 105, a fourth measuring plate 106, and a fifth measuring plate 110. The first measuring plate 103 is located at the lower part of the semi-circular slot 100; the second measuring plate 104 is located on one side of the first movable block 107; the third measuring plate 105 is located on one side of the second measuring plate; the fourth measuring plate 106 is located on the upper part of the first movable block 107; and the fifth measuring plate 110 is located on the upper part of the second movable block. The first measuring plate 103, the second measuring plate 104, the third measuring plate 105, the fourth measuring plate 106, and the fifth measuring plate 110 are distributed along the circumference of the transmission line. Temperature sensors are respectively installed on the first measuring plate 103, the second measuring plate 104, the third measuring plate 105, the fourth measuring plate 106, and the fifth measuring plate 110, allowing the temperature sensors to be deployed along the circumference of the transmission line 101 for measuring temperature data at different locations along the circumference.

[0105] A first fixing block 107 and a second fixing block are respectively provided on both sides of the clamp. A first fixing block 107 is provided with a first opening arranged horizontally and the first opening penetrates the first fixing block. A second fixing block is provided with a second opening and the second opening is set so as not to penetrate the second fixing block. The first opening and the second opening are on the same axis.

[0106] During installation, align the slot with the lower part of the power transmission line 101, and install the power transmission line inside the clamp from bottom to top through the slot, with the power transmission line in contact with the semi-circular slot; the upper part of the power transmission line is clamped by the elastic component.

[0107] Pin 108 is inserted from the first opening into the second opening to lock the upper part of the slot.

[0108] In some embodiments, the resilient component includes:

[0109] An installation groove is formed along the inner wall of the groove. The installation groove has a first groove 202 and a second groove 203, and the cross-sections of the first groove 202 and the second groove 203 are both rectangular. The second groove 203 is larger than the first groove 202. A spring 204 is fixed to the inner wall of the second groove 203. A limiting block 206 is provided at the outer end of the spring 204 and inside the second groove 203. A connecting plug 207 is provided in the middle of the limiting block 206. When the limiting block 206 is installed, the limiting block can be made of elastic resin. After the elastic block extends obliquely from the first groove 202 into the second groove 203, the spring can be pressed down to correct the limiting block 206.

[0110] A movable block 200 is provided with a slot on one side, and the plug is fixed in the slot, so that the limiting block and the movable block are fixed together; after the movable block is fixed to the limiting block, an elastic point for fixing the transmission line 200 is formed in the slot.

[0111] In the above description, the spring is made of resin material. The upper part of the exposed portion of the movable block has an upper inclined surface 207 and a lower inclined surface 208. During installation with the power transmission line 200, the slot is aligned with the lower part of the power transmission line 200, and the power transmission line 200 is installed from bottom to top through the slot. When the power transmission line 200 contacts the elastic component, it presses against the upper inclined surface on the movable block, causing the movable block to slide inward and compress the spring to fix the power transmission line 200 within the clamp. During disassembly, the power transmission line 200 presses against the lower inclined surface on the movable block, causing the movable block to slide inward and compress the spring to remove the power transmission line 200 from the clamp.

[0112] Furthermore, a communication device is provided below the first fixing block or the second fixing block;

[0113] The communication device 115 includes: a housing 400, a cavity 402 disposed inside the housing 400, and at least two partitions disposed inside the cavity 402, for example, referring to... Figure 6 The housing contains a first partition 403 and a second partition 404. The first partition 403 is equipped with a communication board and a controller, and the second partition 404 is equipped with a battery device.

[0114] Bottom cover mounting grooves 401 are provided on both sides of the housing 400, and a limit body 405 is provided at the rear end of the bottom cover mounting groove 401.

[0115] The bottom cover 407 has fitting plates 406 on both sides, and uniformly spaced second through holes for transmitting electromagnetic signals. In this application, the housing 400 and the bottom cover are made of low thermal conductivity ceramic, such as aluminosilicate ceramic. This design allows the communication device to have a good working environment and is not affected by the heat radiation from the power transmission line 200.

[0116] During installation, the mating plate 406 of the bottom cover 407 is installed in correspondence with the bottom cover mounting groove 401, and a locking body is formed at the end of the bottom cover mounting groove 401.

[0117] The battery device is connected to the communication board and the controller; the controller is connected to the communication board, and the communication board is equipped with a receiver, a WiFi module and a GSM / CDMA / GPRS module or a 4G / 5G network module.

[0118] The controller is used to set the data acquisition cycle of the surface acoustic wave temperature probe and the temperature sensor.

[0119] The receiver is used to connect to the surface acoustic wave temperature probe, which is used to obtain the surface temperature of the transmission line.

[0120] The WiFi module is used to connect to the temperature sensor; the temperature sensor is used to acquire temperature distribution data of the circumferential temperature field of the transmission line.

[0121] The GSM / CDMA / GPRS module or 4G / 5G network module is used to communicate with the host computer;

[0122] This application sets up three communication methods: the WiFi module is used to connect the near-field temperature sensor and the communication device; the receiver is used to connect the surface acoustic wave temperature probe and the communication device; and the communication device uses a GSM / CDMA / GPRS module or a 4G / 5G network module to communicate with the host computer.

[0123] Furthermore, the method for obtaining the surface temperature of the transmission line using the surface acoustic wave temperature probe is as follows:

[0124] 1) The controller sends acquisition commands to the surface acoustic wave temperature probe via the receiver according to the set cycle; and generates an electromagnetic signal based on the acquisition commands;

[0125] 2) The surface acoustic wave temperature probe receives electromagnetic signals and inputs them into the control unit of the surface acoustic wave temperature probe. In the control unit, surface acoustic waves are excited through the inverse piezoelectric effect. The spectral characteristics of the surface acoustic waves during propagation are related to the current temperature.

[0126] 3) An echo electromagnetic signal is generated in the surface acoustic wave temperature probe through the piezoelectric effect. The echo electromagnetic signal is transmitted from the surface acoustic wave temperature probe to the controller. The controller filters, converts, and analyzes the waveform of the echo electromagnetic signal to obtain the surface temperature of the transmission line.

[0127] Furthermore, the control system includes:

[0128] The machine learning system includes:

[0129] The configuration module is used to configure the actual coordinates of each temperature sensor based on the actual distance between each temperature sensor and the transmission line.

[0130] The association module is used to associate each temperature sensor and each surface acoustic wave temperature probe with the configuration module and form an association configuration table.

[0131] The capacity expansion monitoring model is set in the machine learning system. The capacity expansion monitoring model obtains the actual temperature of each point based on the association configuration table, and obtains the temperature distribution status of the transmission line circumferentially based on the actual temperature of each point.

[0132] Each point is set according to the actual distance between each temperature sensor and each surface acoustic wave temperature probe and the power transmission line.

[0133] The principle of this application is as follows: This application uses a constructed capacity expansion monitoring model to determine whether the temperature field distribution around the transmission line caused by the capacity expansion exceeds a set threshold, thereby determining whether to carry out capacity expansion operations, or determining the appropriate capacity expansion size based on the current temperature field distribution of the transmission line; at the same time, this application installs temperature monitoring devices at different locations on the transmission line, and uses surface acoustic wave temperature probes and temperature sensors set on the temperature monitoring devices to measure the actual temperature on the surface of the transmission line and at different locations around the transmission line. Based on the measured actual temperature, the temperature distribution around the transmission line can be obtained, thereby performing secondary monitoring of the capacity expansion process.

[0134] The process of dynamic capacity expansion of transmission lines is as follows: The temperature field distribution around the transmission line is obtained through a temperature monitoring device. The control system then collects wind speed, wind direction, ambient temperature, and light radiation data in real time from meteorological and environmental monitoring devices set up near the temperature monitoring device. The control system analyzes the wind speed, wind direction, ambient temperature, light radiation data, and temperature field distribution around the transmission line in real time to calculate the maximum capacity that the line can transmit; or it uses a capacity expansion monitoring model to determine whether the temperature field distribution around the transmission line caused by the capacity expansion exceeds a set threshold.

[0135] Specifically, dynamic capacity expansion of transmission lines includes the following steps: 1) Obtaining the temperature field distribution of the transmission line surface in the circumferential direction under the current transmission capacity based on the temperature monitoring device installed on the transmission line;

[0136] 2) The increased capacity is input to the control system from the input terminal. The control system inputs the increased capacity to the increased capacity monitoring model. Based on the increased capacity monitoring model, it determines whether the temperature field distribution around the transmission line caused by the increased capacity exceeds the set threshold. If the set threshold is exceeded, the increased capacity monitoring model issues a warning to the control system and does not perform the increased capacity action. If the set threshold is not exceeded, a safe increased capacity command is sent to the control system. The control system then performs a gradual, intermittent increased capacity according to the safe increased capacity command at the set increased capacity unit amount until the set increased capacity is reached.

[0137] In step 2), during the process of gradually increasing the capacity in intervals according to the safety increase command, the control system uses a temperature monitoring device to measure the temperature distribution data after each increase, and makes a second judgment based on the temperature distribution data to determine whether the set threshold has been exceeded.

[0138] Reference Figure 7 , Figure 7 The relationship between circumferential thermal radiation from transmission line 200 and distance was simulated. For example, if we assume that the temperature of transmission line 200 is 50℃, then the thermal radiation at a distance of 10cm from the transmission line is 40℃, the thermal radiation at a distance of 20cm from the transmission line is 36℃, and the thermal radiation at a distance of 30cm from the transmission line is 30℃.

[0139] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A dynamic capacity expansion temperature monitoring system for transmission lines, characterized in that, include: Power transmission lines; Control system; Set within the host computer; The input terminal is used to input the required capacity increase to the control system. The control system is equipped with a capacity increase monitoring model. Based on the capacity increase monitoring model, it is determined whether the temperature field distribution around the transmission line caused by the capacity increase exceeds a set threshold. If the set threshold is exceeded, the capacity increase monitoring model issues a warning to the control system and does not perform the capacity increase action. If the set threshold is not exceeded, a safe capacity increase command is sent to the control system, and the control system performs intermittent and gradual capacity increase according to the safe capacity increase command with a set capacity increase unit amount until the set capacity increase is reached. A temperature monitoring device is installed on the transmission line, and the temperature monitoring device is used to acquire temperature distribution data around the transmission line. The temperature monitoring device includes: A U-shaped clamp made of silicon carbide ceramic, wherein the upper half of the clamp is a parallel slot and a semi-circular groove integrally formed with the slot is provided along the lower half of the slot. Multiple grooves are formed on the inner wall of the semi-circular slot, and surface acoustic wave temperature probes are sequentially arranged in the multiple grooves. Multiple evenly arranged elastic components are provided on the inner walls on both sides of the slot; Multiple measuring plates are set along the fixture, and multiple temperature sensors are evenly arranged on each measuring plate. A first fixing block and a second fixing block are respectively provided on both sides of the clamp. The first fixing block has a first opening arranged horizontally and the first opening passes through the first fixing block. The second fixing block has a second opening and the second opening is set so that it does not pass through the second fixing block. The first opening and the second opening are on the same axis. During installation, align the slot with the lower part of the power transmission line, and install the power transmission line inside the clamp from bottom to top through the slot, with the power transmission line in contact with the semi-circular slot; the upper part of the power transmission line is clamped by the elastic component. A pin is inserted from the first opening into the second opening to lock the upper part of the slot.

2. The dynamic capacity expansion temperature monitoring system for transmission lines according to claim 1, characterized in that, The elastic component includes: An installation groove is formed along the inner wall of the groove. The installation groove has a first groove body and a second groove body, and the cross-sections of the first groove body and the second groove body are both rectangular; and the second groove body is larger than the first groove body. A spring is fixed to the inner wall of the second groove. A limit block is set at the outer end of the spring and inside the second groove. A docking plug is set in the middle of the limit block. A movable block has a slot on one side, and a plug is fixed in the slot, so that the limiting block and the movable block are fixed together; after the movable block is fixed to the limiting block, an elastic point for fixing the transmission line is formed in the slot. The exposed portion of the movable block has an upper inclined surface and a lower inclined surface on its upper part. When installing with the power transmission line, the slot is aligned with the lower part of the power transmission line, and the power transmission line is installed from bottom to top through the slot. When the power transmission line contacts the elastic component, the power transmission line presses against the upper inclined surface on the movable block, causing the movable block to slide inward and compress the spring to fix the power transmission line in the clamp.

3. The dynamic capacity expansion temperature monitoring system for transmission lines according to claim 1, characterized in that, A communication device is provided below the first or second fixing block; The communication device includes: a housing, an interior cavity, and at least two partitions disposed within the cavity. The partition is equipped with a communication board, controller, and battery device; The battery device is connected to the communication board and the controller; the controller is connected to the communication board, which is equipped with a receiver, a WiFi module and a GSM / CDMA / GPRS module or a 4G / 5G network module. Bottom cover mounting grooves are provided on both sides of the shell, and a limit body is provided at the rear end of the bottom cover mounting groove; The bottom cover has fitting plates on both sides and evenly spaced through holes.

4. The dynamic capacity expansion temperature monitoring system for transmission lines according to claim 3, characterized in that, The controller is used to set the data acquisition cycle of the surface acoustic wave temperature probe and the temperature sensor. The receiver is used to connect to the surface acoustic wave temperature probe, which is used to obtain the surface temperature of the transmission line. The WiFi module is used to connect to the temperature sensor; the temperature sensor is used to acquire temperature distribution data of the circumferential temperature field of the transmission line. The GSM / CDMA / GPRS module or 4G / 5G network module is used to communicate with the host computer.

5. The dynamic capacity expansion temperature monitoring system for transmission lines according to claim 4, characterized in that, The method for obtaining the surface temperature of the transmission line using the surface acoustic wave temperature probe is as follows: 1) The controller sends acquisition commands to the surface acoustic wave temperature probe via the receiver according to the set cycle; and generates an electromagnetic signal based on the acquisition commands; 2) The surface acoustic wave temperature probe receives electromagnetic signals and inputs them into the control unit of the surface acoustic wave temperature probe. In the control unit, surface acoustic waves are excited through the inverse piezoelectric effect. The spectral characteristics of the surface acoustic waves during propagation are related to the current temperature. 3) An echo electromagnetic signal is generated in the surface acoustic wave temperature probe through the piezoelectric effect. The echo electromagnetic signal is transmitted from the surface acoustic wave temperature probe to the controller. The controller filters, converts, and analyzes the waveform of the echo electromagnetic signal to obtain the surface temperature of the transmission line.

6. The dynamic capacity expansion temperature monitoring system for transmission lines according to claim 1, characterized in that, The control system includes: The machine learning system includes: The configuration module is used to configure the actual coordinates of each temperature sensor based on the actual distance between each temperature sensor and the transmission line. The association module is used to associate each temperature sensor and each surface acoustic wave temperature probe with the configuration module and form an association configuration table. The capacity expansion monitoring model is set in the machine learning system. The capacity expansion monitoring model obtains the actual temperature of each point based on the association configuration table, and obtains the temperature distribution status of the transmission line circumferentially based on the actual temperature of each point. Each point is set according to the actual distance between each temperature sensor and each surface acoustic wave temperature probe and the power transmission line.

7. A method for monitoring the temperature during dynamic capacity expansion of transmission lines, utilizing the dynamic capacity expansion temperature monitoring system for transmission lines as described in any one of claims 1-6, characterized in that, Includes the following steps: 1) Obtain the surface temperature field distribution of the transmission line in the circumferential direction under the current transmission capacity by using a temperature monitoring device installed on the transmission line; 2) The increased capacity is input to the control system from the input terminal. The control system inputs the increased capacity to the increased capacity monitoring model. Based on the increased capacity monitoring model, it is determined whether the temperature field distribution in the circumference of the transmission line caused by the increased capacity exceeds the set threshold. If the set threshold is exceeded, the capacity increase monitoring model will issue a warning to the control system and will not perform the capacity increase action; if the set threshold is not exceeded, a safe capacity increase command will be sent to the control system, which will then perform intermittent and gradual capacity increase according to the safe capacity increase command in the set capacity increase unit amount until the set capacity increase is reached.

8. The method for monitoring the temperature during dynamic capacity expansion of transmission lines according to claim 7, characterized in that, In step 2), during the process of gradually increasing the capacity in intervals according to the safety increase command, the control system uses a temperature monitoring device to measure the temperature distribution data after each increase, and makes a second judgment based on the temperature distribution data to determine whether the set threshold has been exceeded.

9. The method for monitoring temperature during dynamic capacity expansion of transmission lines according to claim 7, characterized in that, The capacity expansion monitoring model was obtained using the following method: 1) Obtain the surface temperature field distribution of the transmission line in the circumferential direction under the current transmission capacity; 2) The transmission capacity is increased multiple times at set intervals according to a set unit amount. Based on the temperature monitoring device installed on the transmission line, the actual temperature at multiple points around the transmission line after each capacity increase is measured to obtain the second temperature distribution N around the transmission line after each capacity increase. i , where i is the sequence number set according to the order of capacity expansion, and i is an integer greater than or equal to 3; 3) Based on the second temperature distribution N i The actual temperature at each point is compensated by a compensation module to form a second temperature field distribution N along the circumference of the transmission line. j , where j is the set index relative to i, and j is an integer greater than or equal to 3; 4) The surface temperature field distribution of the transmission line and the second temperature field distribution N j The data is input into a machine learning system and iteratively trained to form a capacity expansion monitoring model.

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