CN217901057U - Test platform for detecting online temperature measuring device of power transmission line - Google Patents
Test platform for detecting online temperature measuring device of power transmission line Download PDFInfo
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- CN217901057U CN217901057U CN202221367028.5U CN202221367028U CN217901057U CN 217901057 U CN217901057 U CN 217901057U CN 202221367028 U CN202221367028 U CN 202221367028U CN 217901057 U CN217901057 U CN 217901057U
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Abstract
The utility model relates to a temperature measuring device's detection device technical field is a test platform for detecting online temperature measuring device of transmission line, and it includes first temperature sensor, second temperature sensor and hollow temperature tube of leading, leads the temperature tube upper end and is the arc lower extreme and be flat-plate-shaped, leads the temperature tube downside and controls the interval and be equipped with two semiconductor refrigeration pieces. The utility model has reasonable and compact structure, can ensure that the on-line temperature measuring device of overhead conductors and the on-line temperature measuring device of parallel groove clamps can be well attached to the surface of the heat conducting pipe, and greatly improves the heat conduction efficiency between the temperature sensor of the on-line temperature measuring device to be measured and the heat conducting pipe; meanwhile, the temperature measuring position of the online temperature measuring device to be detected and the temperature measuring position of the device can be basically consistent, and the detection error can be reduced as much as possible, so that the device can realize accurate detection of the two online temperature measuring devices.
Description
Technical Field
The utility model relates to a temperature measuring device's detection device technical field is a test platform for detecting online temperature measuring device of transmission line.
Background
In the electrical power field, the maximum allowable operating temperature of a high voltage overhead conductor is an important factor affecting the transmission capacity of an overhead line. The highest allowable operating temperature of a high-voltage overhead conductor (steel-cored aluminum strand) is regulated to be 70 ℃ by the current technical regulations in China, and the allowable temperature of the conductor which can actually operate for a long time is higher than 70 ℃. The power transmission method of the high-voltage overhead power transmission line on the premise mainly comprises two methods: static temperature raising and capacity increasing technology and dynamic capacity increasing technology, wherein the static capacity increasing technology breaks through the regulations of the existing technical regulations and increases the maximum allowable operating temperature of the lead; the dynamic capacity increasing technology is characterized in that an online temperature monitoring device is installed on a power transmission line on the premise of not breaking through the regulations of the existing technical regulations, and the temperature state of a wire is monitored in real time by integrating factors such as environmental meteorological conditions, so that the maximum current-carrying capacity allowed by the wire at any moment is calculated, the objectively hidden capacity of the line is fully utilized, and the transmission capacity of the power transmission line is improved.
Temperature sensing face (or temperature measurement chip) of the temperature sensor among the online temperature measuring device need fully laminate with the position of awaiting measuring on the power transmission line usually, to this current online temperature measuring device can be according to the position shape design assorted sensor fixing base that awaits measuring, if the sensor fixing base cross-section of measuring overhead conductor is arc to be convenient for temperature sensor and overhead conductor surface are better laminated, and the sensor fixing base cross-section of measuring the parallel groove clamp is flat-plate-like, so that temperature sensor and parallel groove clamp surface are better laminated. In the process of using the existing detection device to detect the two online temperature measuring devices, the heat transfer efficiency is not high because the detection device and the online temperature measuring device are in poor contact with each other, and the test error is large. Therefore, the existing online temperature measuring device for the transmission line has the following defects in the actual use process: the same detection device can not only accurately detect the online temperature measuring device of overhead conductors and the like, but also accurately detect the online temperature measuring device of parallel groove clamps and the like.
Disclosure of Invention
The utility model provides a test platform for detecting online temperature measuring device of transmission line has overcome above-mentioned prior art not enough, and its same detection device that can effectively solve current detection device existence can't detect the online temperature measuring device of air wire class again can the accurate online temperature measuring device's of detecting parallel groove clamp class problem.
The technical scheme of the utility model is realized through following measure: a test platform for detecting an online temperature measuring device of a power transmission line comprises a first temperature sensor, a second temperature sensor and a hollow temperature guide pipe, wherein the upper end of the temperature guide pipe is arc-shaped, the lower end of the temperature guide pipe is flat, two semiconductor refrigerating sheets are arranged on the left side and the right side of the lower side of the temperature guide pipe at intervals, and a support is arranged on the lower side of each semiconductor refrigerating sheet, the upper end of the support is fixedly installed together with the corresponding position of the lower side of the temperature guide pipe; the inner sides of the upper end and the lower end of the heat conduction pipe corresponding to the position between the two supports are respectively and fixedly provided with a first temperature sensor and a second temperature sensor, the first temperature sensor, the second temperature sensor and the two semiconductor refrigeration pieces are respectively connected with a control unit, and the control unit is connected with a power supply.
The following are further optimization or/and improvement on the technical scheme of the utility model:
the device also comprises a water cooling head, a water pump, a water tank and a cold row, wherein the lower side of each semiconductor refrigeration piece is provided with the water cooling head of which the upper end is abutted against the lower side of the semiconductor refrigeration piece, and the water pump, the water tank and the at least one cold row are sequentially connected between the water inlet pipe and the water outlet pipe of each water cooling head through pipelines.
The refrigerator also comprises heat insulation cotton, and the front, the rear, the left and the right of each semiconductor refrigerating sheet are filled with the heat insulation cotton.
Above-mentioned support can include bottom plate and supporting bolt, and semiconductor refrigeration piece downside all is equipped with the bottom plate, and the straight hole that link up about the bottom plate four corners all is equipped with, and the heat conduction pipe downside that corresponds every straight hole position all is equipped with the screw hole that link up inside and outside, and equal fixed mounting has the lower part to be located the supporting bolt in the straight hole in every screw hole.
The cross section of the temperature conduction pipe can be semicircular, and the temperature conduction pipe can be a copper pipe.
The heat conducting pipe can further comprise a supporting seat, and the supporting seats are fixedly installed on the outer side of the upper end of the heat conducting pipe at left and right intervals.
The utility model has the advantages of reasonable and compact structure, high durability and convenient use, it can select corresponding temperature measurement face on leading the thermotube according to the type of waiting to examine online temperature measuring device, then will wait to examine online temperature measuring device and place waiting to examine online temperature measuring device on leading the thermotube after aiming at the temperature sensor position that corresponds on leading the thermotube, heat or cool down for leading the thermotube through the control unit control semiconductor refrigeration piece at last, the record contrasts the temperature sensor data on leading the thermotube and waits to examine online temperature measuring device and go up the temperature sensor data, can confirm whether the temperature measurement function of waiting to examine online temperature measuring device satisfies its designing requirement; by using the device, the on-line temperature measuring device of overhead conductors and the on-line temperature measuring device of parallel groove clamps can be well attached to the surface of the heat conducting pipe, and the heat conduction efficiency between the temperature sensor on the on-line temperature measuring device and the heat conducting pipe is effectively improved; meanwhile, the temperature measuring position of the online temperature measuring device to be detected and the temperature measuring position of the online temperature measuring device can be basically consistent, the detection error can be reduced as much as possible, and accurate detection of the two online temperature measuring devices is realized.
Drawings
Fig. 1 is a schematic view of a partial cross-sectional structure of a preferred embodiment of the present invention.
Fig. 2 is a left side view partially in section of fig. 1.
The codes in the figures are respectively: 1 is first temperature sensor, 2 is the second temperature sensor, 3 is leading the temperature pipe, 4 is the semiconductor refrigeration piece, 5 is the water-cooling head, 6 is thermal-insulated cotton, 7 is the bottom plate, 8 is the stay bolt, 9 is the supporting seat, 10 is the inlet tube, 11 is the outlet pipe.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.
The invention will be further described with reference to the following examples and drawings:
the first embodiment is as follows: as shown in the attached drawings 1 and 2, the test platform for detecting the online temperature measuring device of the power transmission line comprises a first temperature sensor 1, a second temperature sensor 2 and a hollow heat conducting pipe 3, wherein the upper end of the heat conducting pipe 3 is arc-shaped, the lower end of the heat conducting pipe is flat, two semiconductor chilling plates 4 are arranged on the left side and the right side of the lower side of the heat conducting pipe 3 at intervals, and a bracket is arranged on the lower side of each semiconductor chilling plate 4, and the upper end of the bracket is fixedly installed with the corresponding position of the lower side of the heat conducting pipe 3; the inner sides of the upper end and the lower end of the temperature conduction pipe 3 corresponding to the position between the two supports are respectively and fixedly provided with a first temperature sensor 1 and a second temperature sensor 2, the first temperature sensor 1, the second temperature sensor 2 and the two semiconductor refrigeration sheets 4 are respectively connected with a control unit, and the control unit is connected with a power supply.
According to the requirements, the positions of the cold end and the hot end of the semiconductor refrigeration piece 4 are related to the direction of current flowing through the semiconductor refrigeration piece 4, so that the semiconductor refrigeration piece 4 is driven by an H-bridge circuit arranged on the control unit, wherein the upper bridge arm is two PMOS tubes, and the lower bridge arm is two NMOS tubes; the control unit can be realized by a unit machine or a microcontroller in the prior art, so that the control unit can control the conduction or the cut-off of MOS (metal oxide semiconductor) tubes on upper and lower bridge arms of an H-bridge circuit by using a PWM (pulse width modulation) signal through a PID (proportion integration differentiation) algorithm to control the heating or the cooling of the heat conducting tube 3 by the semiconductor refrigerating sheet 4, and in addition, in order to facilitate the display and the recording of detection data, the control unit can be provided with a display control device, then manually record data for comparison and analysis, and also can be connected with a computer through a data line, then automatically record the uploading data of a temperature sensor on the device and the uploading data of a temperature sensor on an online temperature measuring device to be detected through software (additionally designed corresponding application software), and then perform data comparison through the software and give a detection result or generate a detection report; the first temperature sensor 1 and the second temperature sensor 2 can be used for monitoring the temperature of the corresponding position of the heat conducting pipe 3 in real time, and the two temperature sensors are arranged between the two semiconductor refrigerating pieces 4 because the temperature change at the position is uniform and the temperature rising and falling speed is high, the interference to the detection process is small, in addition, in order to facilitate the alignment of the position of the temperature sensor on the online temperature measuring device to be detected and the position of the temperature sensor on the device, the outer side of the heat conducting pipe 3 can be provided with a temperature sensor position indication mark; the material of the heat conducting pipe 3 can be silver, copper, aluminum, steel or alloy metal material with better temperature conductivity in the prior art, and can also be heat conducting silica gel or graphite non-metal material; the power supply can be realized by a storage battery or a lithium battery or a solar panel or a power matching adapter plug or an adjustable direct current power supply and the like in the prior art.
The utility model has the advantages of reasonable and compact structure, convenient to use, it can be according to waiting to examine the type of online temperature measuring device and select corresponding temperature measurement face on leading the thermotube 3, then will wait to examine online temperature measuring device to buckle on leading the thermotube 3 after aiming at the temperature sensor position that corresponds on leading the thermotube 3 on the temperature sensor on the online temperature measuring device, control semiconductor refrigeration piece 4 through the control unit at last and give and lead the thermotube 3 heating or cooling, the record contrasts the temperature sensor data on leading the thermotube 3 and waits to examine online temperature measuring device on the temperature sensor data, can confirm whether the temperature measurement function of waiting to examine online temperature measuring device satisfies its designing requirement; by using the device, the temperature sensors of the overhead conductor type online temperature measuring device and the parallel groove clamp type online temperature measuring device can be well attached to the surface of the heat conducting pipe 3, so that the heat conduction efficiency between the heat conducting pipe 3 and the temperature sensor of the online temperature measuring device is effectively improved; meanwhile, the temperature measuring position of the online temperature measuring device to be detected and the temperature measuring position of the device can be basically consistent, and the detection error can be reduced as much as possible, so that the device can accurately detect two online temperature measuring devices.
The test platform for detecting the online temperature measuring device of the power transmission line can be further optimized or/and improved according to actual needs:
example two: as shown in attached figures 1 and 2, the semiconductor refrigeration device further comprises water cooling heads 5, a water pump, a water tank and a cold row, wherein the water cooling head 5 with the upper end abutting against the lower side of each semiconductor refrigeration sheet 4 is arranged on the lower side of each semiconductor refrigeration sheet 4, and the water pump, the water tank and the at least one cold row are sequentially connected between a water inlet pipe 10 and a water outlet pipe 11 of each water cooling head 5 through pipelines.
In the using process, the semiconductor refrigerating sheet 4 is only a heat transfer tool, and when the semiconductor refrigerating sheet is electrified, heat can move from one end to the other end (the heat in the device is transferred between the upper end and the lower end), so that temperature difference is generated to form a cold end and a hot end; however, when the cold end and the hot end of the semiconductor refrigeration piece 4 reach a certain temperature difference (namely, when the heat transfer between the cold end and the hot end is equal or called as reaching a rated temperature difference), a balance point is reached, the positive and reverse heat transfer are mutually counteracted, and the temperature cannot be continuously reduced or increased; therefore, the semiconductor chilling plates 4 are generally required to be used together with the water cooling head 5 and the cold row, so that the semiconductor chilling plates 4 can reach higher or lower temperature; when the cooling liquid temperature of outflow water-cooling head 5 is high to dispel the heat slowly in addition, still can use a plurality of cold rows in series, improve the radiating efficiency of cooling water (coolant) through a plurality of cold rows. According to the requirement, the water cooling head 5 can be a water cooling radiator used for cooling the north bridge of the CPU display card in the prior art and is mainly used for radiating or dissipating cold for the semiconductor refrigeration sheet 4; the cold row is a water-cooling heat dissipation row in the prior art and is used for dissipating heat or cold for water (or special cooling liquid) flowing out of the water-cooling head 5 and accelerating the temperature reduction or rise of the semiconductor refrigerating sheet 4; in order to improve the heat transfer efficiency among the semiconductor refrigeration piece 4, the water cooling head 5 and the temperature guide tube 3, heat-conducting silicone grease can be coated on the contact position of the semiconductor refrigeration piece 4, the water cooling head 5 and the temperature guide tube 3; during the in-service use, two water-cooling heads 5 can share a water tank and water pump, then supply with two water-cooling heads 5 respectively through the pipeline, still can be connected water pump and the control unit, predetermine the temperature threshold value on software then through the control unit automatic control water pump start-stop.
Example three: as shown in fig. 1 and 2, the semiconductor refrigeration sheet further comprises heat insulation cotton 6, and the front side, the rear side, the left side and the right side of each semiconductor refrigeration sheet 4 are filled with the heat insulation cotton 6. Through the arrangement, the heat dissipation or cold dissipation of the semiconductor refrigerating sheet 4 can be effectively reduced, so that the heat or cold generated by the semiconductor refrigerating sheet 4 is transmitted to the heat conducting pipe 3 as much as possible, and the working efficiency of the device is improved.
Example four: as shown in fig. 1 and 2, the support includes bottom plate 7 and supporting bolt 8, and 4 downside of semiconductor refrigeration piece all are equipped with bottom plate 7, and the straight hole that link up from top to bottom all is equipped with in 7 four corners of bottom plate, and the heat pipe 3 downside that leads that corresponds every straight hole position all is equipped with the screw hole that link up inside and outside, and the equal fixed mounting in every screw hole has the lower part to be located the supporting bolt 8 in the straight hole. Through setting up like this, be convenient for this device to realize quick installation, alleviate the weight of support, save the processing cost, can also guarantee simultaneously that the upside of semiconductor refrigeration piece 4 and lead the tight laminating of thermal tube 3 downside. According to the requirement, in order to prevent the heat of the heat conduction pipe 3 from being conducted to the table top or the ground through the supporting bolt 8, the supporting bolt 8 can be made of plastic bolts with poor heat dissipation performance in the prior art, such as nylon bolts or ABS bolts.
Example five: as shown in fig. 1 and 2, the cross section of the thermal conduction tube 3 is semicircular, and the thermal conduction tube 3 is a copper tube. Through the arrangement, the semicircular heat conduction pipe 3 can meet the use requirement of the device, is easier to purchase, and can effectively save the processing cost of the heat conduction pipe 3; copper tubes are selected mainly because copper is inferior to silver in heat conductivity, but copper tubes are much lower in cost than silver tubes and have higher performance-to-cost ratio.
Example six: as shown in the attached figures 1 and 2, the heat conducting pipe comprises a supporting seat 9, and the supporting seat 9 is fixedly arranged on the outer side of the upper end of the heat conducting pipe 3 at left and right intervals. Through setting up like this, when this device is in the online temperature measuring device of inversion state detection flat board class connecting piece, supporting seat 9 can be fast, stably with leading the arc portion support of thermal tube 3 upper end, prevent that this device from rocking. According to the requirement, in order to facilitate installation, the lower end of the supporting seat 9 is matched with the shape of the arc-shaped part at the upper end of the heat conduction pipe 3; the supporting base 9 can be fixedly installed with the thermal conductance tube 3 by a screw fastener or bonding or riveting in the prior art.
The utility model discloses best embodiment's use:
when detecting an overhead conductor type online temperature measuring device: (1) Aligning a temperature sensor on an online temperature measuring device to be detected with a position mark of a first temperature sensor 1, and then buckling the online temperature measuring device to be detected on a heat conducting pipe 3 (considering that the thermal efficiency of a semiconductor refrigerating sheet 4 is more than 1, namely the heating speed is far higher than the cooling speed, the detection process is usually carried out in sequence from low temperature to high temperature); (2) Presetting a low-temperature threshold value by a control unit, adjusting a semiconductor refrigeration sheet 4 to a refrigeration mode, wherein the upper end of the semiconductor refrigeration sheet 4 is a cold end and the lower end is a hot end, the upper end of the semiconductor refrigeration sheet 4 cools a temperature guide pipe 3, starting a water pump, absorbing heat generated by the lower end of the semiconductor refrigeration sheet 4 by a water cooling head 5, and dissipating heat by a cold row, when the temperature reaches the preset low-temperature threshold value, recording the temperature value uploaded by a first temperature sensor 1 and the temperature value of an online temperature measuring device to be detected, modifying the low-temperature threshold value, gradually cooling, repeating the process, and comparing and analyzing the temperature data of a plurality of groups of first temperature sensors 1 and the online temperature measuring device to be detected by testing and recording to obtain whether the online temperature measuring device can meet the design requirement of a low-temperature section; (3) Presetting a high temperature threshold value (greater than zero degree centigrade), adjusting the semiconductor refrigeration piece 4 to a heating mode (namely, modifying the current direction of the semiconductor refrigeration piece 4 through an H bridge), wherein the upper end of the semiconductor refrigeration piece 4 is a hot end and the lower end is a cold end, heating the heat conducting pipe 3 by the upper end of the semiconductor refrigeration piece 4, starting a water pump, absorbing the cold energy generated by the lower end of the semiconductor refrigeration piece 4 through a water cooling head 5, and performing cold dissipation through a cold row, recording the temperature value uploaded by the first temperature sensor 1 and the temperature value of the online temperature measuring device to be detected when the temperature reaches the preset high temperature threshold value, modifying the high temperature threshold value, gradually raising the temperature, repeating the process, recording the temperature data of a plurality of groups of first temperature sensors 1 and the temperature data of the online temperature measuring device to be detected through testing and carrying out contrastive analysis, and obtaining whether the online temperature measuring device can meet the design requirement of a high temperature section. (if a computer is used for matching with related software, the device can be automatically controlled to carry out detection work, and simultaneously, detection data are recorded and contrasted for analysis to obtain a detection conclusion).
When detecting the online temperature measuring device of the parallel groove clamp class: the device is firstly inverted on a test bed, the plane of the lower end of a heat conduction pipe 3 is upward, then a temperature sensor on an online temperature measuring device to be measured is aligned to the position mark of a second temperature sensor 2, and then the online temperature measuring device to be measured is buckled on the heat conduction pipe 3; and (4) repeating the detection steps (2) and (3) of the online temperature measuring devices of overhead conductors, and completing the detection of the online temperature measuring devices of parallel groove clamps, and analyzing whether the online temperature measuring devices meet the design requirements or not.
The invention has reasonable and compact structure, small volume and convenient use, the temperature rising/cooling speed of the semiconductor refrigeration sheet 4 is high, the noise is low, different types of online temperature measuring devices to be measured can be matched with the temperature measuring surface shape of the heat conducting pipe 3, and the temperature of the same position on the heat conducting pipe 3 can be measured simultaneously by the online temperature measuring devices to be measured and the temperature sensor carried by the device, thereby effectively reducing the measurement error and improving the detection precision of the device.
Above technical feature constitutes the utility model discloses an embodiment, it has stronger adaptability and implements the effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.
Claims (10)
1. A test platform for detecting an online temperature measuring device of a power transmission line is characterized by comprising a first temperature sensor, a second temperature sensor and a hollow heat conducting pipe, wherein the upper end of the heat conducting pipe is arc-shaped, the lower end of the heat conducting pipe is flat, two semiconductor refrigerating sheets are arranged on the left side and the right side of the lower side of the heat conducting pipe at intervals, and a support with the upper end fixedly mounted together with the corresponding position of the lower side of the heat conducting pipe is arranged on the lower side of each semiconductor refrigerating sheet; the inner sides of the upper end and the lower end of the heat conduction pipe corresponding to the position between the two supports are respectively and fixedly provided with a first temperature sensor and a second temperature sensor, the first temperature sensor, the second temperature sensor and the two semiconductor refrigeration pieces are respectively connected with a control unit, and the control unit is connected with a power supply.
2. The test platform for detecting the online temperature measuring device of the power transmission line according to claim 1, further comprising a water cooling head, a water pump, a water tank and cold rows, wherein the water cooling head with the upper end abutting against the lower side of each semiconductor refrigeration sheet is arranged on the lower side of each semiconductor refrigeration sheet, and the water pump, the water tank and the at least one cold row are sequentially connected between the water inlet pipe and the water outlet pipe of each water cooling head through pipelines.
3. The test platform for detecting the online temperature measuring device of the power transmission line according to claim 1 or 2, further comprising heat insulation cotton, wherein the front side, the rear side, the left side and the right side of each semiconductor refrigeration sheet are filled with the heat insulation cotton.
4. The test platform for detecting the online temperature measuring device of the power transmission line according to claim 1 or 2, wherein the support comprises a bottom plate and support bolts, the bottom plate is arranged on each of the lower sides of the semiconductor refrigeration sheets, straight holes which are vertically communicated are formed in four corners of the bottom plate, threaded holes which are internally and externally communicated are formed in the lower sides of the temperature conducting tubes corresponding to the positions of the straight holes, and the support bolts with lower portions located in the straight holes are fixedly installed in the threaded holes.
5. The test platform for detecting the online temperature measuring device of the power transmission line according to claim 3, wherein the support comprises a bottom plate and support bolts, the bottom plate is arranged on each of the lower sides of the semiconductor refrigeration plates, straight holes are formed in four corners of the bottom plate, the straight holes are vertically communicated, threaded holes are formed in the lower sides of the temperature conducting pipes corresponding to the positions of the straight holes, the threaded holes are internally and externally communicated, and the support bolts are fixedly arranged in the threaded holes, and the lower portions of the support bolts are located in the straight holes.
6. The test platform for detecting the on-line temperature measuring device of the power transmission line according to claim 1, 2 or 5, wherein the cross section of the temperature conducting tube is semicircular, and the temperature conducting tube is a copper tube.
7. The test platform for detecting the on-line temperature measuring device of the power transmission line according to claim 3, wherein the cross section of the temperature conducting tube is semicircular, and the temperature conducting tube is a copper tube.
8. The test platform for detecting the online temperature measuring device of the power transmission line according to claim 4, wherein the cross section of the temperature conducting tube is semicircular, and the temperature conducting tube is a copper tube.
9. The test platform for detecting the on-line temperature measuring device of the power transmission line according to claim 1, 2, 5, 7 or 8, further comprising a supporting seat, wherein the supporting seat is fixedly installed on the outer side of the upper end of the temperature conducting tube at left and right intervals.
10. The test platform for detecting the online temperature measuring device of the power transmission line according to claim 6, further comprising a support seat, wherein the support seat is fixedly installed on the outer side of the upper end of the temperature conducting tube at left and right intervals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221367028.5U CN217901057U (en) | 2022-06-02 | 2022-06-02 | Test platform for detecting online temperature measuring device of power transmission line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221367028.5U CN217901057U (en) | 2022-06-02 | 2022-06-02 | Test platform for detecting online temperature measuring device of power transmission line |
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| CN217901057U true CN217901057U (en) | 2022-11-25 |
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| CN202221367028.5U Active CN217901057U (en) | 2022-06-02 | 2022-06-02 | Test platform for detecting online temperature measuring device of power transmission line |
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