Method for measuring natural convection temperature field of overhead power transmission line

Abstract

The application provides a method for measuring natural convection temperature field of overhead transmission line, comprising the following steps: 1) installing a plurality of detection devices along the outer periphery of the transmission line to form a measurement channel for measuring the natural convection temperature on the outer periphery of the transmission line; 2) acquiring a first temperature set of a plurality of positions of the transmission line and a second temperature set of a plurality of positions of the measurement channel by the detection device, and transmitting the first temperature set and the second temperature set to an analog device through a communication device; 3) the analog device simulates the temperature of a plurality of different positions of the transmission line in the circumferential direction based on the first temperature set and the second temperature set, so as to simulate the natural convection temperature distribution of the transmission line. The application provides a detection device which is entirely made of silicon carbide ceramics, and the silicon carbide ceramics has good insulation, so that the detection device can be directly installed on the surface of the transmission line.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission, in particular to a method for measuring natural convection temperature field of overhead power transmission line. BACKGROUND

[0002] In the research of high-voltage power transmission, the natural convection of the power transmission line is taken as the main research object, and the temperature field around the surface of the power transmission line is obtained. In the existing disclosed technology, for example, the publication number is: "CN106225942A" discloses a method for measuring natural convection temperature field of overhead power transmission line by using step motor driven split bearing fixed wheel-shaped thermocouple cluster, mainly including the following steps: S1, a plurality of thermocouples are composed of wheel-shaped thermocouple cluster, and are uniformly fixed on the split bearing driven by the step motor. The distance between each thermocouple temperature measuring contact and the conductor is not consistent, which is used to measure the thermal field temperature at different distances from the conductor. S2, the outer ring of the split bearing rotates around the conductor for one cycle at a certain period, and then the temperature distribution of the specified direction and distance around the conductor is obtained. The present application comprehensively considers the temperature field distribution of the power overhead line, the measurement technology and the engineering thermophysics, and can accurately measure the temperature field distribution around the overhead line without affecting the original temperature distribution.

[0003] Because the air is not completely insulated, in the process of high-voltage power transmission, because the thermocouple has very good conductivity, the thermocouple may form a circuit conduction with the high-voltage power transmission line, which may damage the temperature measuring device and affect temperature collection.

[0004] And the circumferential air of the power transmission line drifts with the wind direction with great randomness, cannot form a short-term capture, and causes unstable temperature measurement. SUMMARY

[0005] Therefore, the main purpose of the present application is to provide a method for measuring natural convection temperature field of overhead power transmission line.

[0006] The technical scheme adopted by the present application is as follows:

[0007] The present application provides a method for measuring natural convection temperature field of overhead power transmission line, comprising the following steps:

[0008] 1) a plurality of detection devices are installed along the outer periphery of the power transmission line to form a measurement channel for measuring natural convection temperature on the outer periphery of the power transmission line;

[0009] 2) a first temperature set of a plurality of positions of the power transmission line and a second temperature set of a plurality of positions of the measurement channel are obtained by the detection device, and the first temperature set and the second temperature set are transmitted to the simulation device through the communication device;

[0010] 3) The simulation device simulates the temperature of the different positions of the power line based on the first temperature set and the second temperature set, thereby simulating the natural convection temperature distribution of the power line.

[0011] Preferably, the detection device comprises:

[0012] The U-shaped clamp made of silicon carbide ceramic, the upper half of the clamp is a parallel notch, a semicircular clamping groove is arranged on the lower half of the notch and is integrally formed with the notch;

[0013] A plurality of grooves are formed on the inner wall of the semicircular clamping groove, and a first surface acoustic wave temperature probe is arranged in each groove in sequence;

[0014] A plurality of elastic components are arranged on the inner walls of both sides of the notch in a uniform manner; and a plurality of through holes are arranged on the inner walls of both sides of the notch in a uniform manner;

[0015] A first measurement channel and a second measurement channel for measuring the natural convection temperature are arranged on both sides of the clamp, the first measurement channel and the second measurement channel have the same structure and are both composed of an upper substrate and a lower substrate arranged on the outer wall of the clamp; and the upper substrate, the lower substrate and the outer wall of the clamp form a flow channel which is open on both sides at least in the direction of the power line, the through holes are used to radiate the temperature on the surface of the power line to the inside of the flow channel, and the flow channel is used for natural convection capture of the air around the power line;

[0016] A plurality of second surface acoustic wave temperature probes are arranged in the first measurement channel and the second measurement channel;

[0017] A first fixing block and a second fixing block are arranged on the upper part of the first measurement channel and the second measurement channel respectively, a first opening is arranged on the first fixing block in a transverse direction, the first opening penetrates the first fixing block, a second opening is arranged on the second fixing block, the second opening is arranged not to penetrate the second fixing block, and the first opening and the second opening are on the same axis;

[0018] During installation, the notch is aligned with the lower part of the power line, the power line is installed inside the clamp through the notch from bottom to top, and the power line is in contact with the semicircular clamping groove; the upper part of the power line is clamped by the elastic components;

[0019] A latch is arranged, the latch is inserted into the second opening from the first opening, and the upper part of the notch is locked;

[0020] The plurality of first surface acoustic wave temperature probes are used to measure the first temperature at different positions on the surface of the power line, a first temperature set is formed by the plurality of first temperatures, and the plurality of second surface acoustic wave temperature probes are used to measure the second temperature at different positions in the flow channel, a second temperature set is formed by the plurality of second temperatures.

[0021] Preferably, a communication device is arranged at the lower part of any one of the first and second measuring channels, and a collection board and a communication board and a battery device are arranged inside the communication device, a plurality of collection modules are arranged on the collection board, the collection board and the communication board are connected with the battery device, the collection board is connected with the communication board, a plurality of collection modules are arranged on the collection board, and the plurality of collection modules are respectively connected with the first and second SAW temperature probes; a communication module is arranged on the communication board, and the communication module is used to transmit the first and second temperature sets collected by the collection modules to the simulation device according to a set period.

[0022] Preferably, the elastic assembly comprises:

[0023] A mounting groove is arranged along the inner wall of the slot, the mounting 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.

[0024] A spring is fixed to the inner wall of the second groove body, a limiting block is arranged at the outer end of the spring and located in the second groove, and a plug is arranged at the middle part of the limiting block.

[0025] A movable block is arranged, one side of the movable block is provided with a slot, and the plug is fixed in the slot, so that the limiting block and the movable block are fixed; the movable block is fixed behind the limiting block, and an elastic point for fixing the power transmission line is formed in the slot.

[0026] Preferably, the upper part and the lower part of the exposed part of the movable block form an upper inclined surface and a lower inclined surface respectively, when the slot is aligned with the lower part of the power transmission line during installation of the power transmission line, the power transmission line is installed through the slot from the bottom to the top, and when the power transmission line contacts the elastic assembly, the power transmission line extrudes the upper inclined surface arranged on the movable block, so that the movable block slides inwardly to extrude the spring to fix the power transmission line in the clamp.

[0027] Preferably, the communication module has:

[0028] A plurality of receiving nodes, the plurality of receiving nodes are connected with the plurality of collection modules in one-to-one correspondence, and a connection configuration table of the plurality of receiving nodes and the plurality of collection modules is formed;

[0029] The connection relationship between the collection modules and the first and second SAW temperature probes is written in the connection configuration table, and coordinate data of the actual positions of the plurality of first SAW temperature probes and the plurality of second SAW temperature probes relative to the power transmission line is also written in the connection configuration table, so as to form a node configuration table;

[0030] The node configuration table is stored in the storage unit of the processor,

[0031] A processor coupled to a plurality of receiving nodes, the processor configured to: acquire, by the plurality of receiving nodes, a plurality of first temperatures and a plurality of second temperatures collected by a plurality of collection modules; load a node configuration table, form a first temperature set from the plurality of first temperatures and the node configuration table; form a second temperature set from the plurality of second temperatures and the node configuration table; wherein the first temperature set comprises a first SAW temperature probe corresponding to the first temperature, coordinate data corresponding to the first SAW temperature probe, a collection module corresponding to the first SAW temperature probe, and a receiving node corresponding to the collection module; and the second temperature set comprises a second SAW temperature probe corresponding to the second temperature, coordinate data corresponding to the second SAW temperature probe, a collection module corresponding to the second SAW temperature probe, and a receiving node corresponding to the collection module.

[0032] A communication unit connected to the processor, configured to transmit the first temperature set and the second temperature set to an analog device.

[0033] Preferably, the analog device has:

[0034] A communication unit connected to the processor, configured to transmit the first temperature set and the second temperature set to an analog device.

[0035] An analysis unit configured to analyze the plurality of first temperatures corresponding to the first temperature set based on the first temperature set, and analyze the plurality of second temperatures corresponding to the second temperature set based on the second temperature set.

[0036] A configuration unit configured to configure a three-dimensional simulation diagram of a power transmission line, and based on the actual positional relationship between the plurality of first SAW temperature probes and the plurality of second SAW temperature probes and the power transmission line, mark corresponding positions in the three-dimensional simulation diagram of the power transmission line; and form a plurality of marked points.

[0037] A data layout channel configured to form a one-to-one correspondence between the plurality of first temperatures and the plurality of second temperatures and the marked points, so that each marked point corresponds to temperature data measured by the plurality of first SAW temperature probes and the plurality of second SAW temperature probes.

[0038] An analog unit configured to simulate a sub-temperature field of the marked point and the vicinity of the marked point based on the temperature data obtained by the marked point and taking each marked point as an independent body; and simulate a circumferential natural convection temperature distribution of the power transmission line and a circumferential natural convection temperature field of the power transmission line based on a plurality of sub-temperature fields.

[0039] Preferably, the coordinate data of the actual positions of the plurality of first SAW temperature probes and the plurality of second SAW temperature probes relative to the power transmission line is obtained by the following method:

[0040] A detection device generates a three-dimensional simulation diagram through three-dimensional measurement;

[0041] annotating positions of the plurality of first SAW temperature probes and the plurality of second SAW temperature probes on the three-dimensional simulation diagram;

[0042] embedding the simulation diagram of the power transmission line in the three-dimensional simulation diagram, and establishing a coordinate system with the center of the power transmission line as an origin point;

[0043] calculating positions of each first SAW temperature probe and each second SAW temperature probe relative to the origin point, to obtain coordinate data of actual positions of the plurality of first SAW temperature probes and the plurality of second SAW temperature probes relative to the power transmission line.

[0044] Preferably, the method for obtaining the first temperature by the first SAW temperature probe is as follows:

[0045] 1) The acquisition module issues an acquisition instruction to the first SAW temperature probe according to a set period, and forms an electromagnetic signal based on the acquisition instruction;

[0046] 2) The first SAW temperature probe receives the electromagnetic signal and inputs the electromagnetic signal into a control unit of the first SAW temperature probe, and excites a surface acoustic wave through inverse piezoelectric effect in the control unit, and the frequency spectrum characteristics of the surface acoustic wave in the propagation process are associated with the current temperature;

[0047] 3) A return electromagnetic signal is formed in the first SAW temperature probe through piezoelectric effect, the return electromagnetic signal is transmitted from the first SAW temperature probe to the acquisition module, and the acquisition module filters, analog converts and waveform analyzes the return electromagnetic signal to obtain the first temperature.

[0048] Preferably, the method for obtaining the second temperature by the second SAW temperature probe is as follows:

[0049] 1) The acquisition module issues an acquisition instruction to the second SAW temperature probe according to a set period, and forms an electromagnetic signal based on the acquisition instruction;

[0050] 2) The second SAW temperature probe receives the electromagnetic signal and inputs the electromagnetic signal into a control unit of the second SAW temperature probe, and excites a surface acoustic wave through inverse piezoelectric effect in the control unit, and the frequency spectrum characteristics of the surface acoustic wave in the propagation process are associated with the current temperature;

[0051] 3) A return electromagnetic signal is formed in the second SAW temperature probe through piezoelectric effect, the return electromagnetic signal is transmitted from the second SAW temperature probe to the acquisition module, and the acquisition module filters, analog converts and waveform analyzes the return electromagnetic signal to obtain the second temperature.

[0052] The detection device is made of silicon carbide ceramics, and can be directly installed on the surface of the power transmission line due to the good insulation of the silicon carbide ceramics.

[0053] The surface acoustic wave temperature probe is passive and wireless, and can directly collect the temperature on the surface of the power transmission line.

[0054] The first and second measurement channels can capture the heat radiation on the surface of the power transmission line for a short time, and can effectively measure the circumferential temperature of the power transmission line. BRIEF DESCRIPTION OF DRAWINGS

[0055] The following drawings only schematically illustrate and explain the present application, and do not limit the scope of the present application, in which:

[0056] Figure 1 The flow chart of the method of the present application is shown in the figure.

[0057] Figure 2 The structure diagram of the detection device in the present application is shown in the figure.

[0058] Figure 3 The structure diagram of the detection device installed on the power transmission line in the present application is shown in the figure.

[0059] Figure 4 The structure diagram of the first fixing block in the present application is shown in the figure.

[0060] Figure 5 The structure diagram of the elastic assembly in the present application is shown in the figure.

[0061] Figure 6 The frame principle diagram of the communication module in the present application is shown in the figure.

[0062] Figure 7 The frame principle diagram of the simulation device in the present application is shown in the figure.

[0063] Figure 8 The structure diagram of the communication device in the present application is shown in the figure.

[0064] Figure 9 The simulation diagram of the temperature field of the power transmission line in the present application is shown in the figure. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution, design method and advantages of the present application more clear and explicit, the present application is further described in detail below by combining with the drawings through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and do not limit the present application.

[0066] Referring to Figures 1 to 9 The present application provides a method for measuring the natural convection temperature field of an overhead power transmission line, comprising the following steps: 1) installing a plurality of detection devices along the outer periphery of the power transmission line 200 to form a measurement channel for measuring the natural convection temperature on the outer periphery of the power transmission line 200;

[0067] 2) the detection device obtains a first temperature set of multiple positions of the power transmission line 200 and a second temperature set of multiple positions of the measuring channel, and transmits the first temperature set and the second temperature set to the simulation device through the communication device;

[0068] 3) the simulation device simulates the temperature of multiple different positions of the power line based on the first temperature set and the second temperature set, thereby simulating the natural convection temperature distribution of the power transmission line 200.

[0069] In the above, the detection device comprises a U-shaped clamp 100 made of silicon carbide ceramic, the upper half of the clamp is a parallel notch, and a semicircular clamping groove 104 is arranged on the lower half of the notch in an integral manner with the notch;

[0070] A plurality of grooves are formed in the inner wall of the semicircular clamping groove, and a first surface acoustic wave temperature probe is arranged in each groove in sequence;

[0071] A plurality of uniformly arranged elastic components 109 are arranged on the inner walls of both sides of the notch, and a plurality of uniformly arranged through holes are arranged on the inner walls of both sides of the notch;

[0072] A first measuring channel 114 and a second measuring channel 107 for measuring the natural convection temperature are arranged on both sides of the clamp, the first measuring channel 114 and the second measuring channel 107 have the same structure and are composed of an upper substrate and a lower substrate arranged on the outer wall of the clamp; and the upper substrate, the lower substrate and the outer wall of the clamp form a flow channel which is open at least on both sides in the direction of the power transmission line 200, the through holes are used to radiate the temperature on the surface of the power transmission line 200 to the inside of the flow channel, and the flow channel is used for natural convection capture of the air around the power transmission line 200;

[0073] A plurality of second surface acoustic wave temperature probes are arranged in the first measuring channel 114 and the second measuring channel 107, and a first fixing block 110 and a second fixing block 108 are respectively arranged on the upper part of the first measuring channel 114 and the second measuring channel 107, a first opening 111 is arranged transversely on the first fixing block 110, the first opening 111 penetrates the first fixing block 110, a second opening is arranged on the second fixing block 108, the second opening is arranged not to penetrate the second fixing block 108, and the first opening 111 and the second opening are on the same axis;

[0074] During installation, the notch is aligned with the lower part of the power transmission line 200, the power transmission line 200 is installed in the clamp through the notch from bottom to top, and the power transmission line 200 is in contact with the semicircular clamping groove 104; the upper part of the power transmission line 200 is clamped by the elastic component 109;

[0075] The latch 112 is inserted from the first opening 111 to the second opening to lock the upper part of the slot;

[0076] The plurality of first SAW temperature probes are used to measure first temperatures at different positions on the surface of the power transmission line 200, and a first temperature set is formed by the plurality of first temperatures. The plurality of second SAW temperature probes are used to measure second temperatures at different positions in the flow channel, and a second temperature set is formed by the plurality of second temperatures.

[0077] In some embodiments, the detection device is entirely made of silicon carbide ceramic, and at least the first measurement channel 114 and the second measurement channel 107, the first fixed block 110, the second fixed block 108, and the latch 112 are made of silicon carbide ceramic. Since silicon carbide ceramic has good insulation, it can be directly installed on the surface of the power transmission line 200. Silicon carbide ceramic has good heat conduction performance, and can transfer the heat generated by the power transmission line 200 to the first measurement channel 114 and the second measurement channel 107. At the same time, the heat of the power transmission line 200 is transmitted to the first measurement channel 114 and the second measurement channel 107 through the uniformly arranged through holes on the inner walls of the two sides of the slot, which can simulate the circumferential heat radiation of the power transmission line 200. At the same time, in order to reduce measurement errors, the thermal compensation coefficient is set according to the distance between the first SAW temperature probe and the second SAW temperature probe and the power transmission line 200.

[0078] In some embodiments, the lower part of any one of the first measurement channel 114 and the second measurement channel 107 is provided with a communication device 115, and the communication device 115 comprises a shell 400, a cavity 402 is arranged in the interior of the shell 400, and at least two partitions are arranged in the cavity 402, for example, with reference to Figure 8 The first partition 403 and the second partition 404 are arranged in the shell, the acquisition plate and the communication plate are arranged on the first partition 403, the battery device is arranged on the second partition 404, a plurality of acquisition modules are arranged on the acquisition plate, the acquisition plate and the communication plate are respectively connected with the battery device, the acquisition plate is connected with the communication plate, a plurality of acquisition modules are arranged on the acquisition plate, and the plurality of acquisition modules are respectively connected with the first SAW temperature probe and the second SAW temperature probe. A communication module is arranged on the communication plate, and the communication module is used to transmit the first temperature set and the second temperature set collected by the acquisition module to the simulation device according to a set period.

[0079] In the above, a bottom cover mounting groove 401 is further arranged on the two sides of the shell 400, and a limiting body 405 is arranged at the rear end of the bottom cover mounting groove 401.

[0080] The bottom cover 407 is provided with the fitting plate 406 on both sides of the bottom cover 407, and the bottom cover 407 is provided with uniform second through holes for transmitting electromagnetic signals. In the present application, the shell 400 and the bottom cover are made of low-thermal-conductivity ceramic, such as aluminum silicate ceramic material, so that the communication device can obtain a good working environment and is not disturbed by the heat radiation of the power transmission line 200.

[0081] During installation, the fitting plate 406 of the bottom cover 407 is installed in correspondence with the bottom cover installation slot 401, and the limit body forms a clamping position at the end of the bottom cover installation slot 401.

[0082] In some embodiments, the elastic assembly comprises:

[0083] An installation slot is opened along the inner wall of the slot, the installation slot has a first slot body 202 and a second slot body 203, and the sections of the first slot body 202 and the second slot body 203 are both rectangular; the second slot body 203 is larger than the first slot body 202; a spring 204 is fixed to the inner wall of the second slot body 203, a limit block 206 is arranged at the outer end of the spring 204 and located in the second slot body 203, and a plug 207 is arranged in the middle part of the limit block 206; during installation, the limit block 206 can be made of elastic resin, and after the elastic spring extends obliquely from the first slot body 202 into the second slot body 203, the limit block 206 can be corrected by pressing the spring.

[0084] An activity block 200 is provided with a slot on one side, and a plug is fixed in the slot, so that the limit block and the activity block form a fixed connection; after the activity block is fixed to the limit block, an elastic point position for fixing the power transmission line 200 is formed in the slot.

[0085] In the above, the spring is made of resin material. The upper part and the lower part of the exposed part of the activity block are respectively formed with an upper inclined surface 207 and a lower inclined surface 208. During installation of 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 through the slot from the bottom to the top. When the power transmission line 200 contacts the elastic assembly, the power transmission line 200 presses the upper inclined surface arranged on the activity block, so that the activity block slides inwardly to press the spring to fix the power transmission line 200 in the clamp. When disassembling, the power transmission line 200 presses the lower inclined surface arranged on the activity block, so that the activity block slides inwardly to press the spring to take out the power transmission line 200 from the clamp.

[0086] In the above, the communication module has:

[0087] A plurality of receiving nodes, the plurality of receiving nodes are connected to the plurality of acquisition modules in one-to-one correspondence, and a connection configuration table of the plurality of receiving nodes and the plurality of acquisition modules is formed;

[0088] write the connection relationship of the acquisition module with the first and second SAW temperature probes in the connection configuration table, and write the coordinate data of the actual positions of the plurality of first and second SAW temperature probes relative to the power transmission line 200 in the connection configuration table, to form a node configuration table;

[0089] store the node configuration table in a storage unit of the processor,

[0090] a processor coupled to the plurality of receiving nodes, the processor configured to: acquire, by the plurality of receiving nodes, a plurality of first temperatures and a plurality of second temperatures collected by a plurality of acquisition modules; load a node configuration table, form a first temperature set by combining the plurality of first temperatures with the node configuration table, and form a second temperature set by combining the plurality of second temperatures with the node configuration table; wherein the first temperature set includes first SAW temperature probes corresponding to the first temperatures, coordinate data corresponding to the first SAW temperature probes, acquisition modules corresponding to the first SAW temperature probes, and receiving nodes corresponding to the acquisition modules; and the second temperature set includes second SAW temperature probes corresponding to the second temperatures, coordinate data corresponding to the second SAW temperature probes, acquisition modules corresponding to the second SAW temperature probes, and receiving nodes corresponding to the acquisition modules;

[0091] a communication unit connected to the processor, configured to transmit the first temperature set and the second temperature set to an analog device.

[0092] In the above, the analog device has:

[0093] a communication unit connected to the communication device, configured to acquire the first temperature set and the second temperature set;

[0094] a parsing unit configured to parse the plurality of first temperatures corresponding to the first temperature set based on the first temperature set, and parse the plurality of second temperatures corresponding to the second temperature set based on the second temperature set;

[0095] a configuration unit configured to configure a three-dimensional simulation diagram of the power transmission line 200, and based on the actual position relationship of the plurality of first SAW temperature probes and the plurality of second SAW temperature probes relative to the power transmission line 200, mark corresponding points in the three-dimensional simulation diagram of the power transmission line 200; form a plurality of marked points;

[0096] a data layout channel configured to form one-to-one correspondence between the plurality of first temperatures and the plurality of second temperatures and the marked points, so that each marked point corresponds to temperature data measured by the plurality of first SAW temperature probes and the plurality of second SAW temperature probes;

[0097] The simulation unit simulates the temperature data obtained by the marking points and the sub-temperature field near the marking points based on each marking point as an independent body; and simulates the circumferential natural convection temperature distribution and the circumferential natural convection temperature field of the power transmission line 200 based on the plurality of sub-temperature fields.

[0098] In the above, in order to achieve more accurate data, the thermal compensation coefficient is set according to the distance between the first surface acoustic wave temperature probe and the second surface acoustic wave temperature probe and the power transmission line 200; and Figure 2 、 Figure 3 Three grooves are arranged in the semicircular clamping groove, and a surface acoustic wave temperature probe is arranged in each groove. For example, the first surface acoustic wave temperature probe 102 is arranged below the power transmission line 200, and the second surface acoustic wave temperature probe 101 and the third surface acoustic wave temperature probe 103 are arranged on both sides of the first surface acoustic wave temperature probe 102. Since the first surface acoustic wave temperature probe 102, the second surface acoustic wave temperature probe 101 and the third surface acoustic wave temperature probe 103 are directly in contact with the surface of the power transmission line 200 after installation, the compensation system of the first surface acoustic wave temperature probe 102, the second surface acoustic wave temperature probe 101 and the third surface acoustic wave temperature probe 103 is set to 1, that is, no compensation is performed, and the coordinates between the first surface acoustic wave temperature probe 102, the second surface acoustic wave temperature probe 101 and the third surface acoustic wave temperature probe 103 are recorded.

[0099] A plurality of surface acoustic wave temperature probes are also arranged in the first channel 114 and the second channel 107. For example, the third surface acoustic wave temperature probe 113 is arranged in the first channel 114, and the fourth surface acoustic wave temperature probe 106 is arranged in the second channel 107. The compensation coefficients of the third surface acoustic wave temperature probe 113 and the fourth surface acoustic wave temperature probe 106 are set to 1.15 and 1.12 respectively, and the coordinate data of the three surface acoustic wave temperature probes 113 and the fourth surface acoustic wave temperature probe 106 are recorded. The coordinate data is used to set the configuration of the node configuration table.

[0100] The plurality of acquisition modules correspondingly acquire the temperature data of the first surface acoustic wave temperature probe 102, the second surface acoustic wave temperature probe 101, the third surface acoustic wave temperature probe 103, the third surface acoustic wave temperature probe 113 and the fourth surface acoustic wave temperature probe 106, and transmit the compensated temperature data to the corresponding receiving nodes in the acquisition module according to the set compensation coefficients, and then transmit the compensated temperature data to the processor through the receiving nodes, and transmit the compensated temperature data to the simulation device through the communication unit connected to the processor.

[0101] Referring to Figure 9 , Figure 9The relationship between the circumferential heat radiation of the power transmission line 200 and the distance is simulated. For example, assuming that the temperature of the power transmission line 200 is 50℃, the heat radiation at a position 10cm away from the power transmission line is 40℃, the heat radiation at a position 20cm away from the power transmission line is 36℃, and the heat radiation at a position 30cm away from the power transmission line is 30℃. The heat transfer of the silicon nitride ceramic has a certain attenuation. Therefore, in order to obtain more accurate measurement data, the compensation coefficient of each surface acoustic wave temperature probe is set according to the attenuation of the heat transfer of the silicon nitride ceramic with the distance. The farther the position of the surface acoustic wave temperature probe from the origin of the power transmission line 200, the greater the attenuation, and the greater the corresponding compensation coefficient.

[0102] In the present application, the simulation device adopts one of a host computer, a computer, and a control terminal.

[0103] In the above, the coordinate data of the actual positions of the plurality of first surface acoustic wave temperature probes and the plurality of second surface acoustic wave temperature probes relative to the power transmission line 200 are obtained by the following method:

[0104] The detection device generates a three-dimensional simulation diagram through three-dimensional measurement;

[0105] The positions of the plurality of first surface acoustic wave temperature probes and the plurality of second surface acoustic wave temperature probes are marked on the three-dimensional simulation diagram;

[0106] The simulation diagram of the power transmission line 200 is embedded in the three-dimensional simulation diagram, and a coordinate system is established with the center of the power transmission line 200 as the origin;

[0107] The positions of each first surface acoustic wave temperature probe and each second surface acoustic wave temperature probe relative to the origin are calculated to obtain the coordinate data of the actual positions of the plurality of first surface acoustic wave temperature probes and the plurality of second surface acoustic wave temperature probes relative to the power transmission line 200.

[0108] Preferably, the method for the first surface acoustic wave temperature probe to obtain the first temperature is as follows:

[0109] 1) The acquisition module issues an acquisition instruction to the first surface acoustic wave temperature probe according to a set period, and forms an electromagnetic signal based on the acquisition instruction;

[0110] 2) The first surface acoustic wave temperature probe receives the electromagnetic signal and inputs it into the control unit of the first surface acoustic wave temperature probe. In the control unit, an acoustic surface wave is excited through inverse piezoelectric effect. The frequency spectrum characteristics of the acoustic surface wave are associated with the current temperature during the propagation process of the acoustic surface wave;

[0111] 3) A return electromagnetic signal is formed in the first surface acoustic wave temperature probe through piezoelectric effect. The return electromagnetic signal is transmitted from the first surface acoustic wave temperature probe to the acquisition module. The return electromagnetic signal is filtered, analog-converted, and waveform-analyzed by the acquisition module to obtain the first temperature.​

[0112] Preferably, the second surface acoustic wave temperature probe obtains the second temperature in the following way:

[0113] 1) The acquisition module issues an acquisition instruction to the second surface acoustic wave temperature probe at a set period; and forms an electromagnetic signal based on the acquisition instruction;

[0114] 2) The second surface acoustic wave temperature probe receives the electromagnetic signal and inputs it into a control unit of the second surface acoustic wave temperature probe, in which an inverse piezoelectric effect is used to excite a surface acoustic wave, and the frequency spectrum characteristics of the surface acoustic wave are associated with the current temperature during the propagation of the surface acoustic wave;

[0115] 3) A return electromagnetic signal is formed in the second surface acoustic wave temperature probe through a piezoelectric effect, the return electromagnetic signal is transmitted from the second surface acoustic wave temperature probe to the acquisition module, and the second temperature is obtained by filtering, analog conversion and waveform analysis of the return electromagnetic signal by the acquisition module.

[0116] The detection device is entirely made of silicon carbide ceramic, and can be directly installed on the surface of the power transmission line 200 due to the good insulation of the silicon carbide ceramic.

[0117] The surface acoustic wave temperature probe is used, and the surface acoustic wave temperature probe can directly collect the temperature on the surface of the power transmission line 200 in a passive and wireless manner, and is more reliable and safer.

[0118] The first measurement channel and the second measurement channel are used to temporarily capture the heat radiation on the surface of the power transmission line 200, and can effectively measure the circumferential temperature of the power transmission line 200. In order to achieve that the first measurement channel and the second measurement channel can temporarily capture the heat radiation on the surface of the power transmission line 200, the specifications of the first measurement channel and the second measurement channel are set to 20-30 cm wide and 30-50 cm long when they are set. The long and wide channel setting causes the heat radiation of the power transmission line 200 to form a heat field in the channel. Compared with a directly exposed air field, the heat field is less affected by air flow, can form a relative temperature heat field, and can temporarily capture the heat radiation on the surface of the power transmission line 200.

[0119] The above has described the embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical applications, or technical improvements in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A method for measuring the natural convection temperature field of an overhead transmission line, characterized in that, Includes the following steps: 1) Install multiple detection devices along the outer perimeter of the transmission line to form a measurement channel for measuring natural convection temperature on the outer perimeter of the transmission line; 2) The detection device acquires a first temperature set at multiple locations on the transmission line and a second temperature set at multiple locations on the measurement channel, and transmits the first and second temperature sets to the simulation device through a communication device; 3) The simulation device simulates the temperature at multiple different locations around the circumference of the transmission line based on the first and second temperature sets, thereby simulating the natural convection temperature distribution of the transmission line. The detection 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 first surface acoustic wave temperature probes are sequentially arranged in the multiple grooves. Multiple elastic components are uniformly arranged on the inner walls of both sides of the slot; and multiple through holes are uniformly arranged on the inner walls of both sides of the slot. A first measuring channel and a second measuring channel for measuring natural convection temperature are provided on both sides of the fixture. The first measuring channel and the second measuring channel have the same structure, both consisting of an upper substrate and a lower substrate disposed on the outer wall of the fixture. The upper substrate, the lower substrate, and the outer wall of the fixture form a flow channel that is open on at least both sides along the direction of the power transmission line. The through hole is used to radiate the temperature of the surface of the power transmission line into the flow channel. The flow channel is used to capture the natural convection of air around the power transmission line. Multiple second surface acoustic wave temperature probes are configured in the first and second measurement channels; A first fixing block and a second fixing block are respectively provided in the upper part of the first measurement channel and the second measurement channel. A first opening is provided on the first fixing block and the first opening penetrates the first fixing block. A second opening is provided on the second fixing block and the second opening is set not to penetrate 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. Multiple first surface acoustic wave temperature probes are used to measure the first temperature at different locations on the surface of the transmission line, forming a first temperature set with multiple first temperatures. Multiple second surface acoustic wave temperature probes are used to measure the second temperature at different locations in the flow channel, forming a second temperature set with multiple second temperatures.

2. The method for measuring the natural convection temperature field of an overhead transmission line according to claim 1, characterized in that, in A communication device is provided at the lower part of either the first measurement channel or the second measurement channel. Inside the communication device, there is a data acquisition board, a communication board, and a battery device. Multiple data acquisition modules are provided on the data acquisition board. The data acquisition board and the communication board are respectively connected to the battery device. The data acquisition board is connected to the communication board. The data acquisition modules are respectively used to connect to the first surface acoustic wave temperature probe and the second surface acoustic wave temperature probe. A communication module is provided on the communication board. The communication module is used to transmit the first temperature set and the second temperature set acquired by the data acquisition module to the simulation device according to a set period.

3. The method for measuring the natural convection temperature field of an overhead transmission line 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 provided at the outer end of the spring and inside the second groove. A docking plug is provided 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.

4. The method for measuring the natural convection temperature field of an overhead transmission line according to claim 3, characterized in that, The upper part of the exposed portion of the movable block is provided with an upper inclined surface and a lower inclined surface. 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.

5. The method for measuring the natural convection temperature field of an overhead transmission line according to claim 2, characterized in that, The communication module has: Multiple receiving nodes are connected to multiple acquisition modules in a one-to-one correspondence, forming a connection configuration table between the multiple receiving nodes and the multiple acquisition modules; Write the connection relationship between the acquisition module and the first and second surface acoustic wave temperature probes in the connection configuration table, and write the coordinate data of the actual positions of multiple first and second surface acoustic wave temperature probes relative to the transmission line to form a node configuration table. The node configuration table is stored in the processor's storage unit. A processor coupled to multiple receiving nodes, the processor being configured to acquire multiple first temperatures and multiple second temperatures acquired by multiple acquisition modules through the multiple receiving nodes; A node configuration table is loaded, and multiple first temperatures are combined with the node configuration table to form a first temperature set; multiple second temperatures are combined with the node configuration table to form a second temperature set; wherein, the first temperature set includes the first surface acoustic wave (SAW) temperature probe corresponding to the first temperature, the coordinate data corresponding to the first SAW temperature probe, the acquisition module corresponding to the first SAW temperature probe, and the receiving node corresponding to the acquisition module; the second temperature set includes the second SAW temperature probe corresponding to the second temperature, the coordinate data corresponding to the second SAW temperature probe, the acquisition module corresponding to the second SAW temperature probe, and the receiving node corresponding to the acquisition module. The communication unit is connected to the processor and transmits the first temperature set and the second temperature set to the simulation device.

6. The method for measuring the natural convection temperature field of an overhead transmission line according to claim 2 or 5, characterized in that, The simulation device has: The communication unit is used to connect with a communication device and to acquire a first temperature set and a second temperature set; The analysis unit is used to analyze multiple first temperatures corresponding to the first temperature set based on the first temperature set, and to analyze multiple second temperatures corresponding to the second temperature set based on the second temperature set. The configuration section is used to configure the three-dimensional simulation diagram of the transmission line and to make corresponding annotations on the three-dimensional simulation diagram of the transmission line based on the actual positional relationship between the multiple first surface acoustic wave temperature probes and the multiple second surface acoustic wave temperature probes and the transmission line. Multiple annotation points are formed; The data deployment channel is used to establish a one-to-one correspondence between multiple first temperatures and multiple second temperatures and the marked points, so that each marked point can acquire temperature data measured by multiple first surface acoustic wave temperature probes and multiple second surface acoustic wave temperature probes. The simulation unit simulates the temperature data obtained from the marked points, and simulates the sub-temperature field of the marked point and its vicinity as an independent entity; based on multiple sub-temperature fields, it simulates the circumferential natural convection temperature distribution and the circumferential natural convection temperature field of the transmission line.

7. The method for measuring the natural convection temperature field of an overhead transmission line according to claim 5, characterized in that, The coordinate data of the actual positions of multiple first surface acoustic wave (SAW) temperature probes and multiple second SAW temperature probes relative to the transmission line were obtained through the following method: The detection device generates a three-dimensional simulation image through three-dimensional measurement; The locations of multiple first surface acoustic wave temperature probes and multiple second surface acoustic wave temperature probes are marked on the 3D simulation diagram. The simulated diagram of the transmission line is embedded in the three-dimensional simulation diagram, and a coordinate system is established with the center of the transmission line as the origin. Calculate the position of each first surface acoustic wave (SAW) temperature probe and each second SAW temperature probe relative to the origin to obtain the coordinate data of the actual positions of the multiple first SAW temperature probes and multiple second SAW temperature probes relative to the transmission line.

8. The method for measuring the natural convection temperature field of an overhead transmission line according to claim 4, characterized in that, The method for obtaining the first temperature by the first surface acoustic wave temperature probe is as follows: 1) The acquisition module sends acquisition commands to the first surface acoustic wave temperature probe according to a set cycle; and generates an electromagnetic signal based on the acquisition commands; 2) The first surface acoustic wave temperature probe receives electromagnetic signals and inputs them into the control unit of the first surface acoustic wave temperature probe. In the control unit, surface acoustic waves are excited through the inverse piezoelectric effect. During the propagation of the surface acoustic waves, their spectral characteristics are related to the current temperature. 3) An echo electromagnetic signal is generated in the first surface acoustic wave temperature probe through the piezoelectric effect. The echo electromagnetic signal is transmitted from the first surface acoustic wave temperature probe to the acquisition module. The acquisition module filters, converts, and analyzes the waveform of the echo electromagnetic signal to obtain the first temperature.

9. The method for measuring the natural convection temperature field of an overhead transmission line according to claim 2, characterized in that, The method for obtaining the second temperature using the second surface acoustic wave temperature probe is as follows: 1) The acquisition module sends acquisition commands to the second surface acoustic wave temperature probe according to the set period; and generates an electromagnetic signal based on the acquisition commands; 2) The second surface acoustic wave temperature probe receives electromagnetic signals and inputs them into the control unit of the second surface acoustic wave temperature probe. In the control unit, surface acoustic waves are excited through the inverse piezoelectric effect. During the propagation of the surface acoustic waves, their spectral characteristics are related to the current temperature. 3) An echo electromagnetic signal is generated in the second surface acoustic wave temperature probe through the piezoelectric effect. The echo electromagnetic signal is transmitted from the second surface acoustic wave temperature probe to the acquisition module. The acquisition module filters, converts, and analyzes the waveform of the echo electromagnetic signal to obtain the second temperature.

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