KR20090032312A - Aluminium conductor steel reinforced line sleeve tester - Google Patents

Abstract

An aluminium conductor steel reinforced line sleeve tester is provided to take a measurement signal process and a diagnose method in measuring the length of a steel reinforced line sleeve and an eccentricity state, thereby realizing automation of measurement. A sensor skid(110) is connected to an ACSR(Aluminium Conductor Steel Reinforced) line. A steel reinforced line sleeve(2) is equipped inside the sensor skid. An aluminium sleeve(3) is formed outside the sensor skid. A sensor(120) is combined with the sensor skid. The sensor horizontally reciprocates. The sensor senses the length and an eccentric state of the steel reinforced line sleeve among sleeves. A terminal(130) is electrically connected to the sensor. The terminal displays the length of the steel reinforced line sleeve and eccentric state.

Description

ACSR wire sleeve tester {ALUMINIUM CONDUCTOR STEEL REINFORCED LINE SLEEVE TESTER}

The present invention relates to an ACSR wire sleeve tester.

The ACSR sleeve connecting the Aluminum Conductor Steel Reinforced (ACSR) wire consists of an aluminum sleeve and a wire sleeve, which connects the aluminum portion of the ACSR wire and the wire sleeve connects the steel wire portion of the ACSR wire.

Here, in the case of the transmission line sleeve without eccentricity, most of the current flows through the aluminum sleeve, but in the case of eccentricity, the current flows through the steel sleeve so that heat is generated in the steel sleeve, leading to disconnection in severe cases. Since a power failure accident caused by the failure of such a transmission line causes huge damages in the country, it is required to prevent defective power failure in advance by detecting a defective sleeve in an efficient and reliable manner in advance.

To this end, an ACSR wire sleeve tester has been developed, which measures the position of the steel wire sleeve from the center of the aluminum sleeve and is used to detect defective sleeves with a certain amount of eccentricity.

However, in view of the importance of connections in transmission lines, current technology is below expectations, and some foreign utilities are considering extreme methods of drilling holes in connection sleeves and endoscopes. In addition, in recent years, due to the abnormal climate, there are a lot of forest fires in the dryer worldwide, and as the number of acid rain falls due to air pollution increases, deterioration at the connection part of the transmission line is increasing. The deterioration of the connection area is characterized by a rapid deterioration of the condition once the initial symptoms appear, the initial symptoms are not detectable by infrared thermal images taken from the ground or aircraft, so non-destructive examination of the connection is inevitably required.

1 illustrates a detection principle of a conventional sleeve abnormality.

First, the sleeve 1 'is provided with a steel wire sleeve 2' inside, and an aluminum sleeve 3 'is formed on the outside thereof.

Conventional steel wire sleeve positioner is provided with a steel wire sleeve detection sensor of the magnetoresistance measurement method, and a sensor rotary positioner of a rotary rotary encoder (Rotary encoder) method using a rubber wheel.

The magnetoresistance measuring sensor has two magnets 4 'and 5', an inspection target sleeve 1 'and a magnetic flux measuring sensor 6' arranged in a straight line as shown in FIG. It is a method that measures the changing magnetic flux, which is sensitive to noise and has a large error when the sensor and the sleeve are not aligned.

In addition, the rotary rotary encoder using a rubber wheel (Rotary Encoder) has a problem that an error occurs according to the surface roughness of the sleeve and the secular variation of the rubber wheel.

The present invention is to overcome the above-mentioned conventional problems, an object of the present invention is to improve the low reliability of the conventional tester, to provide the user with the convenience of the ACSR wire sleeve tester that can improve the work efficiency It is.

In order to achieve the above object, the ACSR wire sleeve tester according to the present invention includes a sensor skid mounted on a sleeve formed with a steel wire sleeve inside and an aluminum sleeve formed outside to connect an ACSR (Aluminum Conductor Steel Reinforced) wire; A sensor mechanically coupled to the sensor skid for horizontal reciprocating motion and sensing a length and an eccentric state of the steel wire sleeve of the sleeve; And a terminal electrically connected to the sensor and processing an electrical signal input from the sensor to display a length and an eccentric state of the steel wire sleeve.

The sensor is a Hall sensor; Permanent magnets having different polarities on both sides of the hall sensor; A yoke in close contact with one side of the hall sensor and the permanent magnet; And a magnetic flux inductor that is in close contact with the other side of the hall sensor and allows magnetic flux through the permanent magnet to pass through the sleeve in a bridge shape.

The magnetic flux inductor may be positioned to protrude a predetermined length longer than the end of the permanent magnet so that the sensor sensitivity is improved.

The sensor and the terminal may be connected to each other by a universal serial bus (USB) communication method.

The surface of the sleeve is marked with a straight horizontal line, the sensor skid is also marked with a straight horizontal line, the horizontal line of the sleeve to the horizontal line of the sensor skid overlap each other, Sensor skids can be mounted.

The terminal may calculate the length between the maximum value of the other side and the maximum value of one side of the measured value while the sensor moves from one side to the other side while the sensor moves from one side to the other side along the sensor skid as the length of the wire sleeve. Can be.

The terminal may determine that the wire sleeve is eccentric when the sensor moves from one side to the other along the sensor skid and the sensor is moved from one side to the other and the measured value is not the same.

The terminal may read the pre-stored data file and observe the secular variation through comparative analysis with the currently measured data.

The sensor may be further provided with a non-contact linear encoder to measure the position of the sensor.

The sensor skid may further include an encoder strip in contact with the linear encoder.

The sensor may further include a first switch and a second switch at both sides to measure a limit caused by the sensor skid.

The sensor may further be provided with a reset switch on top of which provides a command to start a new measurement.

The sensor may further include a light emitting diode (LED) indicating an operating state on the top.

As described above, the ACSR wire sleeve tester according to the present invention improves the low precision of the steel sleeve locator of the prior art so that a measurement error of 95% reliability is within ± 5 mm.

In addition, in the present invention, the length of the steel wire sleeve normally constructed is increased by about 20%, so that the length of the steel wire sleeve can be measured simultaneously with the eccentricity to determine whether the construction is normal.

In addition, the present invention can implement the automation of the measurement by introducing a signal processing and diagnostic techniques to improve the problems of the prior art of measuring the eccentricity of the steel wire sleeve depending on the subjectivity of the measurer.

In addition, the present invention provides a database function that can implement the terminal as a PDA for improving the user convenience and small size and light weight, and to observe the comparison analysis and secular variation for the automation of measurement data management.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present invention.

2 is a schematic diagram illustrating an ACSR wire sleeve tester according to the present invention.

As shown in FIG. 2, the ACSR wire sleeve tester 100 according to the present invention includes a sensor skid 110, a sensor 120, and a terminal 130.

The sensor skid 110 is installed on the surface of the inspection target sleeve 1, and serves to provide a progress path for smoothly scanning the sensor 120. The sensor skid 110 includes a skid body 111 to which the sensor 120 is coupled, and an encoder strip 112 installed at one side of the skid body 111.

The sensor 120 scans the sleeve 1 from the left side (upper side) to the right side (lower side) in a state coupled to the sensor skid 110, and then continuously scans from the right side (lower side) to the left side (upper side). These scan data are sent to the terminal 130 through the USB communication port 126, the terminal 130 processes the data to calculate the length and degree of eccentricity of the sleeve (1).

To this end, the sensor 120 is largely composed of a magnetic flux meter 113 having a hall sensor 121a and a permanent magnet 121b, an analog-digital converter 122, an encoder 123, a counter 124, and a microprocessor 125. ), A USB communication port 126, a first switch 127a, a second switch 127b, a reset switch 128, and a status display LED 129. Here, circuits necessary for signal processing such as the analog-to-digital converter 122, the counter 124, and the microprocessor 125 are conventional techniques for those skilled in the art, and thus detailed description thereof will be omitted.

The magnetic flux measuring unit 113 includes a hall sensor 121a and a permanent magnet 121b to detect the steel wire sleeve 2, and the encoder 123 is relative to the sensor 120 with respect to the coordinate system of the sleeve 1. Measure the position. In addition, the USB communication port 126 enables communication with the terminal 130. In addition, the first switch 127a and the second switch 127b measure the left and right movement limits of the sensor 120, and the reset switch 128 provides a command to start a new measurement. In addition, the status display LED 129 displays the operation state of the sensor 120. The terminal 130 is configured as a PDA or a small computer to control the sensor 120, receives the data measured by the sensor 120 via a USB communication cable and analyzes the result, and displays the result on the screen, and follow-up management It has a function to save data or to recall stored data.

end. sensor

In the present invention, the sensor 120 includes a magnetic flux measuring device 121 for detecting the steel wire sleeve 2, a sensor position measuring device 113 for measuring a relative position of the sensor 120 with respect to the coordinate system of the sleeve 1, and an MMI. And a first switch 127a and a second switch 127b for a Man-Machine-Interface, and a status display LED 129 and the like. The detailed configuration and operation principle thereof are as follows.

1) Flux meter

As shown in the simulation result shown in FIG. 3, the magnetic flux measuring device is arranged such that magnetic fluxes formed by two permanent magnets and components constituting the magnetic circuit form a bridge shape near the hall sensor measuring magnetic flux. The Hall sensor is arranged to only respond to the magnetic flux of the vertical component so that the bridge-shaped magnetic flux can be efficiently detected to be unbalanced. Therefore, when the magnetic flux bridge is in equilibrium as shown in FIG. 3, since only the magnetic flux of horizontal components exists, no signal is detected in the hall sensor. However, when the sensor meets the steel wire sleeve and the magnetic flux bridge is unbalanced as shown in FIG. The magnetic flux of the vertical component passing through the sensor is formed and a signal is detected by the hall sensor.

Due to this principle, the sensor according to the present invention can selectively detect only the edge of the steel wire sleeve efficiently.

Here, for convenience of explanation in FIGS. 3 and 4, ①② temporarily means a permanent magnet, ③④ yoke, ⑤ magnetic flux inductor, ⑥ hall sensor, ⑦ ACSR steel wire, and ⑧ steel wire sleeve.

 In FIGS. 3 and 4, the yoke (③, ④) and the magnetic flux inductor (⑤) are made of soft iron having a low magnetic resistance (磁 氣 抵抗), and the magnetic flux inductor (⑤) has a permanent magnet ( It is preferable to arrange a certain amount higher than the end of ①②).

The sensor 120 according to the present invention scans the surface of the sleeve 1 to be measured from left to right in the axial direction, and then scans from right to left. The typical shape of the data obtained in this manner is shown in FIG. The position and length of the steel wire sleeve 2 are calculated by analyzing these data separately. As shown in FIG. 5, the right end position of the steel wire sleeve 2 corresponds to a position where data obtained by scanning from left to right has a minimum value, and the left end position has a maximum value of data obtained by scanning from right to left. Corresponds to the location. Therefore, the length of the steel wire sleeve 2 becomes a difference value between the left end position of the steel wire sleeve 2 and the right end position of the steel wire sleeve 2. In FIG. 5, due to the hysteresis characteristics of the steel wire sleeve 2 magnetized by the permanent magnet 121b of the sensor 120, the data obtained by scanning from left to right and the data obtained by scanning from right to left appear in the opposite direction. have.

As shown experimentally in FIG. 5, the sensor 120 according to the present invention has an advantage of selectively detecting only an edge of the steel wire sleeve 2 efficiently.

2) sensor position meter

The ACSR wire sleeve tester 100 of the present invention includes a sensor position measurer 113 for position measurement of the sensor 120 as shown in FIGS. 1 and 6 and 7. The sensor position measuring unit 113 includes an encoder 123 (Encoder) and a strip 112 (Strip), the encoder 123 (Encoder) is disposed on the sensor 120, the strip 112 is a sensor skid 110 ) Is placed. The method of the sensor position measuring unit 113 has an advantage that a measurement error does not occur compared to a rotary (Rotary Encoder) method that rotates by a rubber wheel employed in the prior art.

3) Action of other parts

The ACSR wire sleeve tester 100 of the present invention includes a first switch 127a and a second switch 127b (micro switches) for measuring the left and right limits of the sensor 120 inside the sensor skid 110, and A reset switch 128 is provided for providing a command to start the measurement, and a status display LED 129 is displayed to indicate the operating state of the sensor 120. The first switch 127a and the second switch 127b operate in contact with inner walls of both left and right ends of the sensor skid 110. The first switch 127a provides information about the reference position of the sensor 120, and the second switch 127b informs that the scan that proceeds from left to right is completed. Scan sequence according to the operation of the switch (Sequence) and the status of the LED display 129 and the message displayed on the screen of the terminal 130 are summarized in Table 1 below.

Switch action Status LED Scan Sequence Screen display Reset switch on Off Reset sensor - 1st switch on Flashing red Distance reset Ready 1st switch off Red Start scanning from left to right L / R Scan 2nd switch on green Start scanning from right to left R / L Scan 2nd switch off - - - 1st switch on Off Scan end End !!!

I. terminal

Terminal 130 according to the present invention is configured as a PDA or a small computer to control the sensor 120, receives and analyzes the data measured by the sensor 120 via USB communication, display the results on the screen and manage the data Has the function to

1) Configuration and operation of GUI (Graphic User Interface) screen

The GUI screen provides a screen of data acquisition mode (hereinafter, referred to as DAQ mode) and historical data mode. In DAQ mode, GUI is provided to actually measure and analyze the sleeve.In historical mode, the GUI is used to manage the sleeve by importing the measurement data already stored in the file and analyzing it. .

A) Configuration and operation of historical data mode GUI screen

The GUI screen in the historical data mode is shown in FIG. The screen is implemented by the standard Windows specification provided by Microsoft, and the detailed configuration and operation of the screen are as follows.

Referring to FIG. 9, as a cursor position value display portion of data displayed on a screen, "Right Scan" means a value corresponding to a cursor position of data scanned from left to right, and "Left Scan" means scanning from right to left. It means a value corresponding to the cursor position of the data, and "Cursor Pos" means the position of the cursor (light blue solid line in FIG. 9).

Referring to FIG. 10, as a selection portion of a mode for controlling a screen by using a mouse, "Cursor" denotes a value display of data corresponding to a position of a cursor (light blue solid line in FIG. 9), and "Pan" denotes a screen. This function is to adjust the overall position of "Zoom", and to enlarge part of the screen. "Reset Graph" means to restore the pan or zoomed screen to its original state. That is, the screen on which "Pan" is performed (the coordinate position is changed) is shown in FIG. 11, and the "Zoom" screen (the coordinate position and width is changed) is shown in FIG.

Referring to FIG. 13, as a part for displaying a result of signal processing and an error diagnosis algorithm, "Signal Quality" indicates a state of a signal as Good, Normal, or Bad, and "Center Pos" indicates a center position of the steel wire sleeve. Indicates the length of the wire sleeve.

"은 상향 순으로 선택(선택이 가능하면 노란색으로 표시 됨)하는 것을 의미하고, "

"은 하향 순으로 선택(선택이 가능하면 노란색으로 표시 됨)함을 의미한다. 가운데 숫자는 선택된 패스(Pass)(최대 50 Pass 까지 저장 가능)를 의미한다.Referring to FIG. 14, a screen for sequentially selecting data measured several times for one sleeve is displayed. "

"Means to select in ascending order (marked yellow when available),"

"Means select in descending order (marked yellow when available). The number in the middle indicates the selected pass (up to 50 passes can be stored).

Referring to FIG. 15, a button for reading stored measurement data is displayed. When the button is pressed, a screen for selecting a file to be read is displayed as shown in FIG. 16.

B) Configuration and operation of DAQ mode GUI screen

Referring to FIG. 17, the GUI screen in the DAQ mode is similar to the GUI screen in the historical data mode (FIG. 8), but includes a screen including a function of displaying a scan state of a measurement sensor and storing measurement data. More are shown. The detailed configuration and operation of the unique functions of the DAQ mode GUI screen are as follows.

Referring to FIG. 18, a screen displaying a scan state of a sensor is illustrated. "Pass No" indicates the number of scans (incremented by 1 when saved to a file). "Status" indicates the scan status as Ready, R / L Scan, L / R Scan, and End. "Ready" means a state capable of scanning. "R / L Scan" means scanning from right to left. "L / R Scan" means scanning from left to right. "End" means end of scan.

Referring to Fig. 19, a data save button is shown. When the data storage button is pressed, a screen for storing data is displayed as shown in FIG. 20. The data save button is automatically activated when scanning is completed. In addition, when the data storage button shown in FIG. 20 is clicked, a screen for typing a file name is displayed as shown in FIG. 21.

Fig. 22 shows a flow chart of the historical data program in the ACSR wire sleeve tester according to the present invention.

As shown, the historical data program performs a program initialization step (S81), a file selection and a historical data reading step (S82) for reading all path data of the file, a signal processing and diagnostic algorithm, and a signal processing and diagnostic. The signal processing and diagnostic step (S83) for displaying the result, the calculation processing review step (S84) for reviewing the measurement signal using the cursor, pan, and zoom functions, and the signal processing and diagnostic result, and the file Determining whether the change has been made (S85), determining whether the pass number has been changed (S86), if the pass number has been changed, changing the pass number and data index to the pass number (S87), and ending (S88). ).

Figure 23 shows a flow chart of a data acquisition program in an ACSR wire sleeve tester according to the present invention.

As shown in the figure, the DAQ program measures the initial and stage of the program (S91), the first switch-on determination stage (S92), an encoder, converts the moving distance, measures the hall sensor signal, and measures the hall sensor signal in mm units. Scan step (S93) for scanning from left to right, the second switch on determination step (S94), and the step of displaying the scan data on the screen in the left to right direction (S95), and the moving distance measured by the encoder The scan step (S96) and the first switch on determination step (S97), and scan data from the right to the left to scan from the right to the left to measure the Hall sensor signal, and stores the Hall sensor signal in mm unit Displaying a signal on the screen (S98), performing a signal processing and diagnostic algorithm, and displaying a signal processing and diagnostic result (S99), and using a cursor, pan, and zoom function to measure a measurement signal. Review, signal processing and diagnostics For review, and it includes a calculation processing review and file storage step (S100), and a reset switch-on determination step (S101) and a termination step (S102) for storing the measured signal in a file.

In this manner, the present invention has the following effects.

1) Improved reliability of steel sleeve eccentric measurement

Compared with the conventional tester, the ACSR wire sleeve tester according to the present invention has greatly improved the sensitivity of the sensor for detecting the steel wire sleeve and the positioning accuracy of the sensor. In particular, the hall sensor for detecting the steel wire sleeve is disposed so as to be located in the center of the magnetic flux of the bridge shape has a feature that can selectively and accurately detect the edge (edge) of the steel wire sleeve. 24 and 25 show measurement error distributions between the conventional tester and the tester according to the present invention.

24 is a result obtained using a wire insertion amount checker (aka Mr. Young) currently used by KEPCO. In the conventional tester (Mr. Young), the standard deviation of error (σ) reaches 6.505 mm and the measurement frequency of 95% is distributed within the error range of ± 12.76 mm. With only 2.12mm, 95% of measurement frequency is distributed within ± 4.16mm of error.

2) Simultaneous measurement of eccentricity and length of steel wire sleeve

Although the tester of the prior art did not measure the length of the steel wire sleeve, the tester according to the present invention provides the function of measuring the length of the steel wire sleeve, so that the defective sleeve can be determined with high reliability. Sleeves are about 20% longer in length)

3) Implement automation of measurement without subjectivity

Relying on the subjectivity of the measurer, which was one of the problems of the prior art, the method has been implemented to measure automation by introducing signal processing and diagnostic techniques.

4) Improvement of work efficiency due to miniaturization, light weight, and automation

ACSR wire sleeve tester according to the present invention, as shown in Figs. 26 to 30, the sensor (105mm in length, 50mm in height, 40mm in width) and the terminal (PDA or small computer) is small and lightweight, so the work on the transmission line It is easy to carry and provides a sensor skid for smooth operation when the sensor is scanned onto the sleeve surface. The aluminum sensor skid, which is 640 mm long, is lightweight and easy to carry when worn with suspenders. In addition, the terminal provides a database function to observe comparative analysis and secular variation for automating measurement data management. FIG. 26 shows the configuration of the entire tester according to the present invention, and FIG. 27 shows the state when the sensor skid is put on the sleeve and the sensor is scanned. 28 to 30 show an embodiment of a sensor and a sensor skid according to the present invention.

Here, although not exactly shown in the photograph, a straight horizontal line is marked on the surface of the sleeve in advance, and a straight horizontal line is also marked on the sensor skid in advance. Thus, the sensor skid is mounted on the sleeve such that the horizontal lines of the sensor skid overlap each other on the horizontal line of the sleeve.

In this state, the terminal moves the sensor from one side (left) to the other side (right) along the sensor skid and the maximum value of the other side (right) of the measured values, and the sensor from the other side (right) to one side (left). It drives signal processing and diagnostic techniques that calculate the length between the maximum value on one side (left) of the measured values as the length of the wire sleeve.

In addition, the terminal is a value measured by moving the sensor from one side (left) to the other (right) along the sensor skid, and if the sensor is moved from the other side (right) to one side (left) and the measured value is not the same Drives signal processing and diagnostic techniques to calculate that the wire sleeve is eccentric.

What has been described above is just one embodiment for carrying out the ACSR wire sleeve tester according to the present invention, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, the gist of the present invention Without departing from the technical spirit of the present invention to the extent that any person of ordinary skill in the art to which the present invention pertains various modifications can be made.

Figure 1 illustrates a conventional steel wire sleeve detection principle.

2 is a schematic diagram illustrating an ACSR wire sleeve tester according to the present invention.

3 and 4 show the magnetic flux distribution in a sensor in an ACSR wire sleeve tester according to the present invention.

Figure 5 shows the measurement signal shape of the sensor in the ACSR wire sleeve tester according to the present invention.

Figure 6 is a front view of the ACSR wire sleeve tester according to the present invention, Figure 7 is a side view.

8-16 illustrate a historical data mode graphic user interface in an ACSR wire sleeve tester according to the present invention.

17-21 illustrate a data acquisition mode graphic user interface in an ACSR wire sleeve tester according to the present invention.

Fig. 22 shows a flow chart of the historical data program in the ACSR wire sleeve tester according to the present invention.

Figure 23 shows a flow chart of a data acquisition program in the ACSR wire sleeve tester according to the present invention.

24 and 25 are graphs showing the error distribution of the tester according to the prior art and the present invention.

26 to 30 are photographs showing an ACSR wire sleeve tester according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100; ACSR wire sleeve tester according to the present invention

110; Sensor skid

111; Skid body

112; Encoder strip

113; Sensor position meter

120; sensor

121; Flux meter

121a; Hall sensor

121b; Permanent Magnet

122; Analog to digital converter

123; Encoder,

124; counter

125; Microprocessor

126; USB communication port

127a; First switch

127b; Second switch

128; Reset switch

129; LED

130; terminal

Claims (13)

A sensor skid mounted on a sleeve formed with a steel wire sleeve therein and an aluminum sleeve formed outside to connect an ACSR (Aluminum Conductor Steel Reinforced) wire; A sensor mechanically coupled to the sensor skid for horizontal reciprocating motion and sensing a length and an eccentric state of the steel wire sleeve of the sleeve; And, And a terminal electrically connected to the sensor to process an electrical signal input from the sensor to display a length and an eccentric state of the wire sleeve. The method of claim 1, wherein the sensor Hall sensor; Permanent magnets having different polarities on both sides of the hall sensor; A yoke in close contact with one side of the hall sensor and the permanent magnet; And, And a magnetic flux inductor in close contact with the other side of the hall sensor, the magnetic flux through the permanent magnet passing through the sleeve in a bridge shape. 3. The ACSR electrical wire sleeve tester according to claim 2, wherein the magnetic flux inductor is protruded a predetermined length longer than the end of the permanent magnet so that the sensor sensitivity is improved. The ACSR electric wire sleeve tester of claim 1, wherein the sensor and the terminal are connected to each other by a universal serial bus (USB) communication method. The method of claim 1, wherein a straight horizontal line is displayed on the surface of the sleeve, a straight horizontal line is also displayed on the sensor skid, and the horizontal line of the sensor skid overlaps the horizontal line of the sleeve. ACSR wire sleeve tester, characterized in that the sensor skid is mounted on the sleeve. The method of claim 5, wherein the terminal The length of the wire sleeve is calculated as the length between the maximum value of the other side of the measured value while the sensor moves from one side to the other side along the sensor skid and the maximum value of one side of the measured value while the sensor moves from the other side to the other side. ACSR wire sleeve tester. The method of claim 5, wherein the terminal ACSR wire sleeve tester, it is determined that the wire sleeve is eccentric when the sensor moves from one side to the other along the sensor skid and the measured value is different from the other side. . The ACSR wire sleeve tester according to claim 1, wherein the terminal reads a pre-stored data file and compares the secular change with the currently measured data. 2. The ACSR wire sleeve tester of claim 1, wherein the sensor is further provided with a non-contact linear encoder to measure the position of the sensor. 10. The ACSR electrical wire sleeve tester of claim 9, wherein the sensor skid further includes an encoder strip in contact with the linear encoder. The ACSR electric wire sleeve tester according to claim 1, wherein the sensor further comprises a first switch and a second switch to measure a limit caused by the sensor skid on both sides. 2. The ACSR wire sleeve tester of claim 1, wherein the sensor further comprises a reset switch at the top for providing a command to start a new measurement. The ACSR wire sleeve tester of claim 1, wherein the sensor further includes a light emitting diode (LED) indicating an operating state on the sensor.

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