阅读说明：本技术 一种隔离开关触头夹紧力测试系统 (Isolator contact clamp force test system ) 是由 杨书磊 周玉龙 李汶航 田冰冰 冯旭 于 2021-07-01 设计创作，主要内容包括：本发明公开一种隔离开关触头夹紧力测试系统,包括采集器节点和监测终端。采集器节点,包括集成一体的传感器动端、传感器静端、采集模块以及电池；监测终端,其通过无线传输的方式接收若干采集器节点所发送的数据；在所述监测终端中安装有监控软件,用以对若干采集器节点进行采集监控以及对所接收到的数据进行处理分析,并在显示界面中进行显示操作。传感器和采集电路一体,解决了传感器模拟信号传输的干扰问题；采用整个采集节点电池供电的方式解决了测试现场的供电问题；采用无线的数据传输方式,一个监测端(可以同时控制和监测多个采集节点,解决了不能多节点同时进行测试的问题；采用专用的测试软件免除人工记录和判断。(The invention discloses a system for testing the contact clamping force of an isolating switch. The collector node comprises a sensor moving end, a sensor static end, a collection module and a battery which are integrated into a whole; the monitoring terminal receives data sent by the plurality of collector nodes in a wireless transmission mode; and monitoring software is installed in the monitoring terminal and used for collecting and monitoring the plurality of collector nodes, processing and analyzing the received data and performing display operation in a display interface. The sensor and the acquisition circuit are integrated, so that the problem of interference of analog signal transmission of the sensor is solved; the power supply problem of a test site is solved by adopting a whole collection node battery power supply mode; the wireless data transmission mode is adopted, one monitoring end (can simultaneously control and monitor a plurality of acquisition nodes, the problem that a plurality of nodes cannot be tested simultaneously is solved, and the manual recording and judgment are avoided by adopting special testing software.)

1. A disconnector contact clamping force testing system, comprising:

the collector node comprises a sensor moving end, a sensor static end, a collection module and a battery which are integrated into a whole; a sensor is arranged between the movable end and the static end of the sensor and used for testing and acquiring the clamping force of the contact of the disconnecting switch; the acquisition module comprises a data acquisition channel, a single chip microcomputer and a memory, wherein the data acquisition channel is connected with the sensor in a signal mode and used for acquiring data acquired by a sensor in a test mode, transmitting the data to the single chip microcomputer, processing the data by the single chip microcomputer, and storing the processed data through the memory and transmitting the processed data through a world port; the battery is connected with the single chip microcomputer to provide electric quantity for the work of the whole collector node;

the monitoring terminal receives data sent by the plurality of collector nodes in a wireless transmission mode; and monitoring software is installed in the monitoring terminal and used for collecting and monitoring the plurality of collector nodes, processing and analyzing the received data and performing display operation in a display interface.

2. The system for testing the clamping force of a disconnector contact as claimed in claim 1, characterized in that the monitoring terminal is a computer or a hand-held mobile terminal.

3. The system for testing the clamping force of the contact of the isolating switch as claimed in claim 1, wherein the sensor is a load cell, the lower part of the load cell is a threaded hole for being in bolted connection with the static end of the sensor, and the upper part of the load cell is a self-contained screw structure for being connected with the dynamic end of the sensor.

4. The system for testing the clamping force of the disconnecting switch contact as claimed in claim 3, wherein the load cell operates in a bridge manner, 4 bridge arm resistors are formed by 4 resistor discs, and an initial resistor R1-R2-R3-R4, when the output voltage U-0 is reached, the bridge is in a balanced state, and when the disconnecting switch contact is deformed, the change of each resistor is respectively Δ R1, Δ R2, Δ R3 and Δ R4, and the corresponding change of the output voltage is as follows:

5. the system for testing the clamping force of a disconnector contact of claim 1, wherein the display interface comprises:

the status bar is used for displaying the current corresponding status of each phase acquisition node;

the pressure is displayed in real time and is respectively the pressure value, the total pressure value, the average value of the total pressure and the fluctuation value of the total pressure of the channel 1 and the channel 2;

and the pressure data trend graph is used for displaying the A, B and C phases, converting curves of the pressure in the test process and recording total pressure data of the collection node in the whole test process from pressure application to pressure stabilization.

6. The system for testing the clamping force of the contact of the disconnecting switch according to claim 1 or 5, wherein the monitoring software comprises a node confirming unit, which is used for confirming the information of the collection node participating in the test before the test is carried out, the collection node information is automatically set after the software is started by default, the user does not need to modify the collection node information, the user only needs to select the node participating in the test, and the software defaults to automatically select all three phases of A, B and C.

7. The system for testing the clamping force of the disconnecting switch contact as claimed in claim 6, wherein the monitoring software further comprises a decision parameter setting unit for setting a threshold condition for the status decision of the contact clamping force;

the state judgment logic of the judgment parameter setting unit is as follows: if the clamping force is larger than the mean value threshold value and the force fluctuation in the judging period is smaller than the fluctuation threshold value under the given threshold value condition, indicating that the test is successful, otherwise indicating that the test is unsuccessful; specially, if the number of judging times exceeds the set maximum judging number, the test is not successful;

the parameters are defined as follows:

a determination period: time frame for completing one state decision. The software automatically performs a calculation of the mean, the fluctuation and the maximum within this range.

Maximum number of determinations: if the number of state determinations made after the start of the acquisition exceeds the set maximum determination number, it is suggested that the test is unsuccessful.

Mean threshold of each phase: and after the threshold value is exceeded, entering a flow of comparing the fluctuation value threshold value, prompting that the test is successful or unsuccessful, otherwise, continuing to judge the state of the next time if the threshold value condition is not reached.

Fluctuation threshold of each phase force: and on the premise of exceeding the force average value threshold value, comparing the fluctuation threshold value, if the calculated fluctuation value is smaller than the set fluctuation threshold value, prompting that the test is successful, otherwise, prompting that the test is unsuccessful.

8. The system for testing the contact clamping force of the disconnecting switch according to claim 6, wherein the monitoring software further comprises a zero clearing calibration unit, so that each phase acquisition node needs to perform zero clearing calibration operation on the sensor before acquiring data, the zero clearing operation is completed successfully, a progress is prompted in the calibration process, and after the completion, a status bar prompts 'calibrated', and acquisition can be started;

the monitoring software further comprises a starting acquisition unit, when the calibration operation of the zero clearing calibration unit is completed, a 'starting acquisition' button is clicked to acquire and record pressure data, the latest pressure data can be refreshed on the LED lamp in the process, total pressure transformation curved edges corresponding to all nodes in the test process can be displayed on a map, data file records corresponding to the test process are generated when the acquisition is started, the data file records are closed when the acquisition is stopped, the stability judgment of clamping force of all phases corresponding to the test is carried out, and the stability judgment is automatically given out in a status bar.

9. The system for testing the clamping force of the contact of the disconnecting switch according to claim 8, wherein the monitoring software further comprises a collection stopping unit, when the tester feels that the test can be finished, the "collection stopping" button is clicked, and the software automatically stores the recorded data when the test is finished;

10. the system for testing the clamping force of the contact of the disconnecting switch as claimed in claim 9, wherein the monitoring software further comprises a data printing unit, after the test is completed and before the test is started, the completed historical data is printed, a 'data printing' button is clicked, a 'data printing' dialog box is popped up, all data are listed by inquiring according to the date, and then the selection is carried out.

Technical Field

The invention relates to the field of electric power testing, in particular to a system for testing the clamping force of a contact of an isolating switch.

Background

At present, for the similar test of the contact clamping force of the disconnecting switch, a sensor is installed at the static end of the contact, and a sensor signal is led out from the installation position of the contact and then is subjected to data acquisition and data reading by using an independent acquisition device or a sensor adapting device on the ground.

The system connection diagram of the existing test mode is shown in fig. 1, and because the sensor signal needs to be led out, and the sensor signal is an analog electrical signal, in the leading-out process, especially in the concentrated electromagnetic environment of the power equipment, the analog signal is very easy to interfere, which causes the problems of inaccurate measurement, unstable reading value, and the like.

Because the test process is carried with necessary contact fittings and is also provided with corresponding acquisition equipment, part of the acquisition equipment needs to be powered on site, power supply wiring on a power overhaul site is not easy, and the high-altitude operation risk in the test process cannot be ignored. These all burden the field service work.

The collector is connected with the sensor by a cable, and the analog input channel of the collector is limited, thereby limiting the possibility of simultaneous detection of the multi-way isolating switches and increasing the difficulty of field wiring

The monitoring end uses general acquisition software or a sensor adapter, various parameters required in field testing are inconvenient to flexibly set, and the sensor adapter does not have a recording function and needs to fill in a recording form manually, so that the workload of a tester is increased.

Disclosure of Invention

The present invention is directed to overcoming at least one of the problems set forth above and to providing a system for testing a clamping force of a contact of a disconnector.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a disconnector contact clamping force testing system comprising:

the collector node comprises a sensor moving end, a sensor static end, a collection module and a battery which are integrated into a whole; a sensor is arranged between the movable end and the static end of the sensor and used for testing and acquiring the clamping force of the contact of the disconnecting switch; the acquisition module comprises a data acquisition channel, a single chip microcomputer and a memory, wherein the data acquisition channel is connected with the sensor in a signal mode and used for acquiring data acquired by a sensor in a test mode, transmitting the data to the single chip microcomputer, processing the data by the single chip microcomputer, and storing the processed data through the memory and transmitting the processed data through a world port; the battery is connected with the single chip microcomputer to provide electric quantity for the work of the whole collector node;

the monitoring terminal receives data sent by the plurality of collector nodes in a wireless transmission mode; and monitoring software is installed in the monitoring terminal and used for collecting and monitoring the plurality of collector nodes, processing and analyzing the received data and performing display operation in a display interface.

Further, the monitoring terminal is a computer or a handheld mobile terminal.

Furthermore, the sensor is a force measuring sensor, the lower part of the force measuring sensor is a threaded hole for being in bolted connection with the static end of the sensor, and the upper part of the force measuring sensor is required to be of a structure with a screw and used for being connected with the movable end of the sensor.

Furthermore, the load cell operating principle is a bridge type, 4 bridge arm resistors are composed of 4 resistor sheets, and when the output voltage U is 0, the bridge is in a balanced state, and when the isolating switch contact deforms, the variation of each resistor is Δ R1, Δ R2, Δ R3, and Δ R4, and the corresponding variation of the output voltage is:

further, the display interface includes:

the status bar is used for displaying the current corresponding status of each phase acquisition node;

the pressure is displayed in real time and is respectively the pressure value, the total pressure value, the average value of the total pressure and the fluctuation value of the total pressure of the channel 1 and the channel 2;

and the pressure data trend graph is used for displaying the A, B and C phases, converting curves of the pressure in the test process and recording total pressure data of the collection node in the whole test process from pressure application to pressure stabilization.

Furthermore, the monitoring software comprises a confirmation node unit which is used for determining the information of the collection nodes participating in the test before the test is carried out, all the collection nodes are automatically set after the software is started by default, the user does not need to modify the collection nodes, the user only needs to select the nodes participating in the test, and all three phases A, B and C are automatically selected by default.

Furthermore, the monitoring software further comprises a judgment parameter setting unit for setting a threshold condition for judging the contact clamping force state.

Further, the state determination logic of the determination parameter setting unit is: if the clamping force is larger than the mean value threshold value and the force fluctuation in the judging period is smaller than the fluctuation threshold value under the given threshold value condition, indicating that the test is successful, otherwise indicating that the test is unsuccessful; specially, if the number of judging times exceeds the set maximum judging number, the test is not successful;

the parameters are defined as follows:

a determination period: time frame for completing one state decision. The software automatically performs a calculation of the mean, the fluctuation and the maximum within this range.

Maximum number of determinations: if the number of state determinations made after the start of the acquisition exceeds the set maximum determination number, it is suggested that the test is unsuccessful.

Mean threshold of each phase: and after the threshold value is exceeded, entering a flow of comparing the fluctuation value threshold value, prompting that the test is successful or unsuccessful, otherwise, continuing to judge the state of the next time if the threshold value condition is not reached.

Fluctuation threshold of each phase force: and on the premise of exceeding the force average value threshold value, comparing the fluctuation threshold value, if the calculated fluctuation value is smaller than the set fluctuation threshold value, prompting that the test is successful, otherwise, prompting that the test is unsuccessful.

Further, the monitoring software further comprises a zero clearing calibration unit, so that each phase acquisition node needs to perform zero clearing calibration operation on the sensor before acquiring data, the zero clearing operation is completed successfully, a progress prompt is provided in the calibration process, and after the completion, a status bar prompts that the calibration is finished, and the acquisition can be started at this moment.

Furthermore, the monitoring software also comprises a starting acquisition unit, after the calibration operation of the zero clearing calibration unit is completed, a button for starting acquisition is clicked to acquire and record pressure data, the latest pressure data can be refreshed on the LED lamp in the process, total pressure transformation curved edges corresponding to all nodes in the test process can be displayed on a map, data file records corresponding to the test process are generated when the acquisition is started, the data file records are closed when the acquisition is stopped, the stability judgment of clamping force of all phases corresponding to the test is carried out, and the stability judgment is automatically given out in a status bar.

Furthermore, the monitoring software also comprises a collection stopping unit, when the tester feels that the test can be finished, the 'collection stopping' button is clicked, the software automatically stores the recorded data when the test is finished.

Further, the monitoring software also comprises a print data unit, after the test is finished and before the test is started, the finished historical data is printed, a print data button is clicked, a print data dialog box is popped up, all data are inquired and listed according to the date, and then selection is carried out

Compared with the prior art, the invention has the beneficial effects that:

the sensor and the acquisition circuit are integrated, so that the problem of interference of analog signal transmission of the sensor is solved; the power supply problem of a test site is solved by adopting a whole collection node battery power supply mode; by adopting a wireless data transmission mode, one monitoring end (a notebook computer) can simultaneously control and monitor a plurality of acquisition nodes, so that the problem that a plurality of nodes cannot be tested simultaneously is solved; and special test software is adopted to avoid manual recording and judgment. The working efficiency is improved, human errors are reduced, the application of a new technology for the intrinsic safety of field maintenance operation is promoted, and the safety risk control capability of outdoor maintenance operation is improved.

Drawings

FIG. 1 is a schematic connection diagram of a conventional isolating switch contact clamping force testing system;

fig. 2 is a schematic diagram illustrating a system for testing a clamping force of a contact of a disconnecting switch according to an embodiment of the present invention;

FIG. 3 is a simplified schematic diagram of FIG. 2;

FIG. 4 is a display interface diagram;

FIG. 5 is a diagram of a validation node operator interface;

FIG. 6 is a view showing an operation interface of the decision parameter setting unit;

FIG. 7 is a diagram of an operation interface of the zero calibration unit;

FIG. 8 is a diagram of a print data unit operation interface;

FIG. 9 is a diagram of a print report format;

FIG. 10 is a schematic diagram of the operation of the load cell;

FIG. 11 is a flowchart of the operation of the monitor terminal;

FIG. 12 is a flowchart of the operation of a collector node.

Detailed Description

Example (b):

in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection, electrical connection and signal connection; they may be connected directly or indirectly through intervening media, so to speak, as communicating between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

Referring to fig. 2 to 3, the system for testing the contact clamping force of the disconnecting switch provided in the present embodiment mainly includes a collector node 1 and a monitoring terminal 2. The monitoring terminal may be a computer or a handheld mobile terminal such as a mobile phone, a tablet, a PDA, etc., and in this embodiment, the monitoring terminal is a computer.

The collector node comprises a sensor moving end, a sensor static end, a collecting module and a battery; a sensor is arranged between the movable end and the static end of the sensor and used for testing and acquiring the clamping force of the contact of the disconnecting switch; the acquisition module comprises a data acquisition channel, a single chip microcomputer and a memory, wherein the data acquisition channel is connected with the sensor in a signal mode and used for acquiring data acquired by a sensor in a test mode, transmitting the data to the single chip microcomputer, processing the data by the single chip microcomputer, and storing the processed data through the memory and transmitting the processed data through a world port; the battery is connected with the single chip microcomputer to provide electric quantity for the work of the whole collector node. That is, the collected data can be stored in the local end in advance, and the original data is reserved, so that the subsequent detection and maintenance are facilitated. Meanwhile, the movable end of the sensor, the static end of the sensor and the acquisition module are integrated, so that the problem of interference of analog signal transmission of the sensor is solved; the power supply problem of a test site is solved by adopting a mode of battery power supply of the whole acquisition node.

The monitoring terminal receives data sent by a plurality of collector nodes in a wireless transmission mode; the monitoring terminal is provided with monitoring software for collecting and monitoring a plurality of collector nodes, processing and analyzing the received data and displaying in a display interface. By adopting a wireless data transmission mode, one monitoring end (a notebook computer) can simultaneously control and monitor a plurality of acquisition nodes, so that the problem that a plurality of nodes cannot be tested simultaneously is solved; and special test software is adopted to avoid manual recording and judgment. The working efficiency is improved, human errors are reduced, the application of a new technology for the intrinsic safety of field maintenance operation is promoted, and the safety risk control capability of outdoor maintenance operation is improved.

Specifically, as shown in fig. 4, the display interface includes:

and a status bar for displaying the current corresponding status of each phase of the acquisition node, such as whether the network connection is normal, calibration is in progress, calibration is completed, acquisition is in progress, and whether the clamping force is stable or not is judged.

And displaying the pressure in real time, namely displaying the newly acquired pressure values which are respectively the pressure values and the total pressure values of the channel 1 and the channel 2, the average value of the total pressure, the fluctuation value of the total pressure and the unit N (Newton).

And (3) a pressure data trend graph shows three phases of A, B and C, a pressure transformation curve in the test process is recorded, and total pressure data of the collection node in the whole test process from pressure application to pressure stabilization are recorded.

As shown in fig. 5-9, the monitoring software includes:

the node confirming unit, as shown in fig. 5, is used for determining the information of the collection nodes participating in the test before the test is performed, and all the collection nodes are automatically set after the software is started by default, the user does not need to modify the collection nodes, the user only needs to select the nodes participating in the test, and all the three phases of a, B and C are automatically selected by the software by default.

A determination parameter setting unit, as shown in fig. 6, for setting a threshold condition for determining the contact clamping force state, clicking a "parameter setting" button at the upper right, popping up a parameter setting dialog box, and setting and modifying the determination condition

Logic for state determination: if the clamping force is greater than the mean threshold value and the force fluctuation within the decision period (default 20 seconds) is less than the fluctuation threshold value under the given threshold condition, "test success" is indicated, otherwise, if greater than the force fluctuation threshold value, "test unsuccessful" is indicated. Specifically, if the number of determinations exceeds the set maximum number of determinations, a "test unsuccessful" is indicated.

The parameters are defined as follows:

a determination period: time frame for completing one state decision. The software automatically performs a calculation of the mean, the fluctuation and the maximum within this range.

Maximum number of determinations: if the number of state determinations made after the start of the acquisition exceeds the set maximum determination number, it is suggested that the test is unsuccessful.

Mean threshold of each phase: and after the threshold value is exceeded, entering a flow of comparing the fluctuation value threshold value, prompting that the test is successful or unsuccessful, otherwise, continuing to judge the state of the next time if the threshold value condition is not reached.

Fluctuation threshold of each phase force: and on the premise of exceeding the force average value threshold value, comparing the fluctuation threshold value, if the calculated fluctuation value is smaller than the set fluctuation threshold value, prompting that the test is successful, otherwise, prompting that the test is unsuccessful.

And a zero clearing calibration unit, as shown in fig. 7, for performing a zero clearing calibration operation on the sensor before data acquisition of each phase acquisition node, waiting for the completion of the zero clearing operation successfully, prompting progress in the calibration process, and prompting "calibrated" in a status bar after completion, wherein acquisition can be started at this time.

And the acquisition starting unit clicks a 'acquisition starting' button after the calibration operation of the zero clearing calibration unit is completed to acquire and record pressure data, the latest pressure data can be refreshed on the LED lamp in the process, total pressure transformation curved edges corresponding to all nodes in the test process can be displayed on a map, a data file record corresponding to the test process is generated when the acquisition is started, the data file record is closed when the acquisition is stopped, the stability judgment of all clamping forces corresponding to all the nodes participating in the test is carried out, and the data file record is automatically given out in a status bar.

And the acquisition stopping unit clicks a 'acquisition stopping' button when a tester feels that the test can be finished, the test is finished, and the recorded data is automatically stored by the software. The data save path is visible above the software.

As shown in fig. 8, after the test is completed and before the test is started, the print data unit prints the completed history data, clicks the "print data" button, pops up a "print data dialog box", inquires and lists all data according to the date, and then selects the data, and arranges the data names according to the date from large to small.

Before printing, the data name needs to be clicked twice, the printing information is read out, and then the printing button is clicked to generate a printing report.

The print report format is shown in fig. 9.

Specifically, the work flow of the monitoring terminal 2 (upper computer) is shown in fig. 11, and the work flow of the collector node 1 (lower computer) is shown in fig. 12.

Specifically, for a 500kV open-type disconnecting switch contact clamping force testing tool, the sensor is a force measuring sensor, an installation mechanism is required to be arranged in the vertical direction, a threaded hole is formed in the lower portion of the force measuring sensor and used for being connected with a static end of a testing mechanism through a bolt, and a screw structure is required to be arranged on the upper portion of the force measuring sensor and used for being connected with a moving end of the testing mechanism.

In a test system where the test structure is cylindrical with a cross-sectional diameter of 40mm, the base size is within 30mm when selecting the sensor, and sufficient height needs to be reserved for sufficient strength of the test structure.

Since the calibration process is only directed to the zero and slope parameters of the system test. The nonlinearity and repeatability of the sensor are the keys for ensuring the overall accuracy of the testing tool, and the system requires that the nonlinearity and repeatability parameters of the sensor are within 0.5%.

The measuring range of the testing tool is 2000N, and two sensors are arranged on each testing mechanism. In order to ensure enough testing margin, the sensor adopts 200Kg measuring range. In order to improve the matching precision of the acquisition end, the sensor needs to ensure the sensitivity of more than 1.0 mV/V.

As shown in fig. 10, the load cell operates in a bridge manner in which 4 bridge arm resistors are formed by 4 resistor discs, and an initial resistor R1-R2-R3-R4 is set, so that the bridge is in a balanced state when the output voltage U is 0. When the disconnecting switch contact is deformed, the variation of each resistor is respectively delta R1, delta R2, delta R3 and delta R4, and the corresponding variation of the output voltage is as follows:

therefore, through the design, the force measuring sensor can accurately isolate the deformation of the contact of the switch.

The strain gauge measuring circuit has the function of converting the resistance change rate delta R/R of the resistance sheet into voltage output, and then supplying the voltage output to the amplifying circuit for amplification and measurement. At a small strainUnder the conditions of (a), the bridge output voltage can be proved to be:

if Δ R is caused only by mechanical deformation, independent of the temperature influence, and the sensitivity coefficients Ks of 4 resistive patches are equal, it can be written according to:

if the bridge supply voltage E is not changed, the voltage output delta U caused by the deformation of the component is in linear relation with the strain values epsilon 1, epsilon 2, epsilon 3 and epsilon 4 of the 4 bridge arms. Where each epsilon is an algebraic value, the sign of which is determined by the direction of deformation. Typically, the tensile strain is "positive" and the compressive strain is "negative". According to this characteristic: when the epsilon (epsilon 1 and epsilon 3 or epsilon 2 and epsilon 4) symbols of two adjacent bridge arms are consistent, the two strains are cancelled out; if the signs are opposite, the absolute values of the two strains are added.

In conclusion, the system has the following beneficial effects in practical application by adopting the scheme:

1. the precision is improved:

the system design effectively avoids the external interference caused by the longer cable transmission of the sensor signal, and effectively improves the test precision.

2. The efficiency is improved:

collector node integrated design removes personnel from and carries multiple test instrument, reduces personnel's burden:

the battery power supply design does not need to arrange power supply equipment and lines on a test field.

The wireless transmission design avoids wiring for the equipment on the test site.

The special test software is flexible to set and can be suitable for testing under different conditions, data can be monitored and stored in real time, and workload and possible errors caused by manual data recording are avoided.

3. Extensibility

The network protocol is used for transmitting data, the possibility of future multi-node testing is improved, and a multi-channel intelligent testing system can be formed by optimizing a software control system according to the requirements of users in the future.

4. The operation safety and reliability are improved.

The lengthy field wiring of the signal acquisition cable is avoided, and after the test nodes are installed, a tester can measure on the ground, so that the risk of high-altitude operation in the measuring process is avoided, and the operation safety and reliability are improved.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.