JP2020034432A - Conductor degradation detecting device - Google Patents

Abstract

To provide a conductor degradation detecting device with which it is possible to improve the accuracy of detecting the degradation of a conductor.SOLUTION: A conductor degradation detecting device 1 comprises: a pair of coil sensors 10, each having an excitation coil 11 for generating a magnetic field and a detection coil 12 for detecting the magnetic field, which are provided facing each other in an opposite direction Y across an electric wire W; and a processing unit 60 for generating a magnetic field at mutually different timing by each excitation coil 11 of the pair of coil sensors 10, and executing a process of detecting the degradation of conductor W1 of the electric wire W on the basis of the magnetic field detection values respectively detected by each detection coil 12 of the pair of coil sensors 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a conductor deterioration detection device.

  As a conventional conductor deterioration detection device, for example, Patent Literature 1 discloses an apparatus that detects a deterioration state of an inspection object using an eddy current detection sensor having an eddy current detection coil.

JP 2010-038724 A

  By the way, the apparatus described in Patent Document 1 has room for further improvement, for example, in terms of detection accuracy of the deterioration state.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a conductor deterioration detection device capable of improving the detection accuracy of conductor deterioration.

  In order to achieve the above object, a conductor deterioration detection device according to the present invention has an excitation coil for generating a magnetic field, and a detection coil for detecting a magnetic field, and is opposed to each other with an electric wire interposed therebetween in the facing direction. Magnetic fields are generated at mutually different timings by the pair of coil sensors provided and the exciting coils of the pair of coil sensors, and the detected values of the magnetic field detected by the detecting coils of the pair of coil sensors, respectively. And a processing unit for executing processing for detecting deterioration of the conductor of the electric wire based on

  Further, in the conductor deterioration detection device, the processing unit generates magnetic fields at different timings toward the inspection target site in the electric wire along the opposing direction by the pair of excitation coils of the pair of coil sensors. The detection value detected by each of the detection coils of the pair of coil sensors is set as one of the detection values in the inspection target portion, and the detection value in the inspection target portion is set based on the one set of the detection values. Processing for detecting deterioration of the conductor may be executed.

  The conductor deterioration detection device further includes a housing provided with the pair of coil sensors, and a drive mechanism that relatively moves the electric wire and the housing along the extending direction, and the processing unit includes: A process for detecting the deterioration of the conductor in accordance with the relative movement between the electric wire and the pair of coil sensors may be executed.

  In the conductor deterioration detection device according to the present invention, a pair of coil sensors each having an excitation coil and a detection coil are provided to face each other with an electric wire interposed therebetween. In the conductor deterioration detection device, the processing unit generates magnetic fields at mutually different timings by the respective excitation coils of the pair of coil sensors, and performs processing based on the detection values of the magnetic fields detected by the respective detection coils of the pair of coil sensors. And a process for detecting deterioration of the conductor of the electric wire. With this processing, the conductor deterioration detection device can suppress the influence of the magnetic field generated by the excitation coil of one coil sensor on the detection of the magnetic field by the detection coil of the other coil sensor. As a result, the conductor deterioration detecting device has an effect that the detection accuracy of conductor deterioration can be improved.

FIG. 1 is a block diagram illustrating a schematic configuration of the conductor deterioration detection device according to the embodiment. FIG. 2 is a schematic cross-sectional view of a housing included in the conductor deterioration detection device according to the embodiment. FIG. 3 is a schematic cross-sectional view of a housing included in the conductor deterioration detection device according to the embodiment. FIG. 4 is a schematic perspective view of a housing included in the conductor deterioration detection device according to the embodiment. FIG. 5 is a time chart illustrating an example of the excitation timing of each excitation coil included in the conductor deterioration detection device according to the embodiment. FIG. 6 is a flowchart illustrating an example of a process in the conductor deterioration detection device according to the embodiment. FIG. 7 is a schematic diagram illustrating the operation of the conductor deterioration detection device according to the embodiment. FIG. 8 is a diagram illustrating the operation of the conductor deterioration detection device according to the embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited by the embodiment. The components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

  In the following description, of the first direction, the second direction, and the third direction that intersect each other, the first direction is referred to as “extending direction X”, and the second direction is referred to as “opposing direction Y”. , The third direction is referred to as “width direction Z”. Here, the extending direction X, the facing direction Y, and the width direction Z intersect (cross) at right angles to each other. The extending direction X typically corresponds to a direction in which an electric wire to be inspected by the conductor deterioration detecting device extends. The facing direction Y typically corresponds to a direction in which a pair of coil sensors of the conductor deterioration detecting device face each other. FIG. 2 is a cross-sectional view along the width direction Z of the housing of the conductor deterioration detecting device, and is a cross-sectional view along AA shown in FIG. Further, FIG. 3 is a cross-sectional view along the extending direction X of the housing of the conductor deterioration detection device, and is a BB cross-sectional view shown in FIG.

[Embodiment]
The conductor deterioration detection device 1 according to the present embodiment illustrated in FIG. 1 is an inspection device that detects deterioration of the conductor W1 of the electric wire W using so-called eddy current testing (ECT: Eddy Current Testing). The electric wire W is an inspection target (specimen) whose conductor W1 is inspected for deterioration by the conductor deterioration detection device 1. The electric wire W includes a conductor W1 and an insulating coating W2. The conductor W1 is a core wire configured by bundling or twisting a plurality of conductive metal wires Wa. The insulating coating W2 is made of an insulating resin material and covers and insulates the outer peripheral surface (outer surface) of the conductor W1. The electric wire W is formed such that a cross-sectional shape orthogonal to the extending direction X is formed in a substantially circular shape, and the conductor W1 and the insulating coating W2 extend linearly with substantially the same diameter along the extending direction X. The conductor deterioration detecting device 1 generates an eddy current in the conductor W1 of the electric wire W by a magnetic field (magnetic flux) generated by the excitation coil 11, and the detection coil 12 generates a magnetic field (magnetic flux) in the conductor W1 according to the eddy current. Is detected, the deterioration of the conductor W1 is detected. Hereinafter, each configuration of the conductor deterioration detection device 1 will be described in detail with reference to the drawings.

  Note that the deterioration of the conductor W1 to be inspected by the conductor deterioration detection device 1 is typically corrosion of the conductor W1, and occurs due to, for example, aging. In the following description, the electric wire W to be inspected by the conductor deterioration detecting device 1 will be described as being an overhead distribution line suspended in the air via a power pole or the like, but is not limited thereto.

  Specifically, as shown in FIGS. 1, 2, 3, and 4, the conductor deterioration detection device 1 includes a pair of coil sensors 10, an electronic circuit 20, a housing 30, a driving mechanism 40, A display unit 50 and a processing unit 60 are provided.

  Each of the pair of coil sensors 10 has an excitation coil 11 and a detection coil 12, and is provided to face each other with the electric wire W interposed therebetween in the facing direction Y. The excitation coil 11 and the detection coil 12 are coils configured by winding windings in a spiral or spiral shape, respectively. The excitation coil 11 is a coil that generates a magnetic field (magnetic flux) when an alternating current is applied, and generates an eddy current in the conductor W1 by the generated magnetic field. The detection coil 12 is a coil for detecting a magnetic field (magnetic flux), and an induced current flows due to a magnetic flux change of the magnetic field corresponding to the eddy current generated in the conductor W1. Each coil sensor 10 has at least one excitation coil 11 and one detection coil 12. One of the coil sensors 10 is arranged on one side of the electric wire W in the facing direction Y, and the other coil sensor 10 is arranged on the other side of the electric wire W in the facing direction Y. In other words, the electric wire W to be inspected is disposed between the pair of coil sensors 10 in the facing direction Y in the conductor deterioration detection device 1. The pair of coil sensors 10 is configured such that substantially the same characteristics are obtained between the pair of coil sensors 10 in each of the excitation coil 11 and the detection coil 12.

  The positional relationship between the exciting coil 11 and the detecting coil 12 in each coil sensor 10 is not limited to the positional relationship shown in each drawing. In the following description, when the paired coil sensors 10 are distinguished from each other, they are referred to as “coil sensor 10A” and “coil sensor 10B” for convenience, and the paired coil sensors 10 need to be particularly distinguished. When there is no, there is a case where it is simply referred to as “coil sensor 10”. Similarly, when the pair of excitation coils 11 are separately described, the excitation coil 11 of the coil sensor 10A is referred to as “excitation coil 11A”, and the excitation coil 11 of the coil sensor 10B is referred to as “excitation coil 11B”. When it is not necessary to particularly distinguish and explain 11, it may be simply referred to as “excitation coil 11”. Further, when the pair of detection coils 12 are separately described, the detection coil 12 of the coil sensor 10A is referred to as “detection coil 12A”, and the detection coil 12 of the coil sensor 10B is referred to as “detection coil 12B”. When there is no need to particularly distinguish and describe 12, it may be simply referred to as “detection coil 12”. The coil sensor 10A, the excitation coil 11A, and the detection coil 12A constitute a first coil sensor 10, a first excitation coil 11, and a first detection coil 12, respectively. The coil sensor 10B, the excitation coil 11B, and the detection coil 12B constitute a second coil sensor 10, a second excitation coil 11, and a second detection coil 12, respectively.

  The electronic circuit 20 is a circuit for realizing magnetic field generation and magnetic field detection by the coil sensor 10. The electronic circuit 20 includes an oscillation circuit 21, detection circuits 22A and 22B, and a switching circuit 23.

  The oscillation circuit 21 is an excitation circuit that excites the excitation coils 11A and 11B to generate a magnetic field. The oscillation circuit 21 generates an AC current for exciting the exciting coils 11A and 11B, and applies the AC current to the exciting coils 11A and 11B. In the electronic circuit 20 of the present embodiment, one oscillation circuit 21 is used both for exciting the exciting coil 11A and for exciting the exciting coil 11B. The oscillation circuit 21 is electrically connected to the switching circuit 23, and is electrically connected to either the exciting coil 11A or the exciting coil 11B via the switching circuit 23. The switching circuit 23 is a circuit for switching between a state in which the oscillation circuit 21 and the excitation coil 11A are electrically connected and a state in which the oscillation circuit 21 and the excitation coil 11B are electrically connected. The connection relationship between the oscillation circuit 21 and the excitation coil 11A and the excitation coil 11B is switched via the switching circuit 23. The oscillation circuit 21 applies an alternating current to the exciting coil 11A while being electrically connected to the exciting coil 11A via the switching circuit 23. The oscillation circuit 21 applies an alternating current to the excitation coil 11B while being electrically connected to the excitation coil 11B via the switching circuit 23.

  The detection circuits 22A and 22B are circuits that detect an induced current flowing through the detection coil 12 as a detection signal. The detection signal (induction current) detected by the detection circuits 22A and 22B changes according to, for example, a change in magnetic flux of a magnetic field corresponding to the eddy current generated in the conductor W1, that is, an eddy current generated in the conductor W1 and the like. Is a signal corresponding to. The detection circuit 22A is electrically connected to the detection coil 12A, and detects an induced current flowing through the detection coil 12A as a detection signal. The detection circuit 22B detects an induced current flowing through the detection coil 12B as a detection signal.

  The housing 30 is a box-shaped member provided with the pair of coil sensors 10. The housing 30 is made of an insulating resin material. The housing 30 is formed in a substantially rectangular parallelepiped box shape in which the extending direction X is the long side direction. The housing 30 has a hollow interior, and a pair of coil sensors 10 is housed inside the housing 30.

  The pair of coil sensors 10 are assembled inside the housing 30 in the above-described positional relationship. That is, inside the casing 30, the coil sensor 10A is disposed on the inner wall surface 30b of the wall 30a on one side in the facing direction Y, and the coil sensor 10B is disposed on the inner wall surface of the wall 30c on the other side in the facing direction Y. 30d. The coil sensor 10A and the coil sensor 10B are fixed to the inner wall surfaces 30b and 30d, respectively, so that the interval along the opposing direction Y is kept constant.

  In the housing 30, a pair of wall portions 30e and 30f facing each other along the extending direction X are formed with an electric wire insertion hole 30g. The electric wire insertion hole 30g is a through hole formed to penetrate the walls 30e and 30f along the extending direction X, respectively. Each wire insertion hole 30g allows the wire W to pass through the inside and outside of the housing 30. Each wire insertion hole 30g is formed at a substantially central portion in the opposing direction Y and the width direction Z in each of the walls 30e and 30f.

  With the above configuration, the pair of coil sensors 10 arranged on the inner wall surfaces 30b and 30d are arranged on both sides of the electric wire W with respect to the facing direction Y in a state where the electric wire W is inserted into each of the electric wire insertion holes 30g. It is located opposite. In other words, the electric wire W inserted into each electric wire insertion hole 30g is located between the pair of coil sensors 10 in the facing direction Y.

  Note that the housing 30 is typically configured to house the electronic circuit 20, the driving mechanism 40, the processing unit 60, and the like, but is not limited thereto.

  The drive mechanism 40 relatively moves the electric wire W and the housing 30 along the extending direction X. The drive mechanism 40 of the present embodiment moves the housing 30 along the extending direction X with respect to the electric wire W suspended in the air via a power pole or the like. The drive mechanism 40 is configured to include, for example, a motor 41 (see FIG. 1), a drive roller 42 (see FIG. 3), and the like. The motor 41 is a power source that generates rotational power. The drive rollers 42 are provided as a pair in contact with the electric wires W inside the housing 30, and are driven to rotate by rotation power generated by the motor 41. The drive mechanism 40 is driven to rotate by the rotation power generated by the motor 41 while the drive roller 42 is in contact with the electric wire W. The drive mechanism 40 draws the electric wire W into the housing 30 from the one electric wire insertion hole 30g by the driving roller 42 that is driven to rotate, and also drives the electric wire W from the other electric wire insertion hole 30g to the outside of the housing 30. The housing 30 is caused to travel on the electric wire W in such a manner as to be sent out. Thereby, the drive mechanism 40 moves the housing 30 in the extending direction X with respect to the electric wire W. In the example of FIG. 3, two drive rollers 42 are shown on the inner wall surface 30 b side of the housing 30, but the invention is not limited thereto. For example, the drive roller 42 may be provided so as to sandwich the electric wire W in the extending direction X.

  The display unit 50 displays an inspection result regarding the deterioration of the conductor W1 of the electric wire W. The display unit 50 is configured by a display or the like that outputs image information. The display unit 50 is typically provided outside the housing 30, and is communicably connected to the processing unit 60 or the like by wire or wirelessly.

  The processing unit 60 controls each unit of the conductor deterioration detection device 1 in an integrated manner. The processing unit 60 performs various processes for realizing the deterioration inspection of the conductor W1 of the electric wire W by the conductor deterioration detection device 1. The processing unit 60 includes an electronic circuit mainly composed of a known microcomputer including a central processing unit such as a CPU, and various storage devices such as a semiconductor memory. The processing unit 60 is communicably connected to each unit of the conductor deterioration detection device 1 such as the electronic circuit 20, the driving mechanism 40, and the display unit 50, and can exchange various signals with each unit.

  Specifically, the processing unit 60 includes a storage unit 61, an operation control unit 62, a determination unit 63, and the like, in a functional concept.

  The storage unit 61 is a storage device such as a ROM, a RAM, and a semiconductor memory. The storage unit 61 stores conditions and information necessary for various processes in the conductor deterioration detection device 1, various programs executed by the operation control unit 62 and the determination unit 63, control data, and the like. Further, the storage unit 61 can store detection result information and the like regarding the detection signal detected by the detection coil 12. The information is read from the storage unit 61 by the operation control unit 62, the determination unit 63, and the like as needed. The operation control unit 62 and the determination unit 63 execute various programs stored in the storage unit 61, and operate the various units of the conductor degradation detection device 1 to realize various functions by operating the programs. Execute the process.

  The operation control section 62 is a section that executes processing for controlling the operation of each section of the conductor deterioration detection device 1 such as the electronic circuit 20, the driving mechanism 40, and the display section 50. The operation control unit 62 controls the operation of the oscillation circuit 21 of the electronic circuit 20 and the operation of the switching circuit 23, and generates a magnetic field for generating an eddy current in the conductor W1 by each of the excitation coils 11 of the pair of coil sensors 10. Processing can be performed. The operation control unit 62 controls the operation of the detection circuits 22A and 22B of the electronic circuit 20 to detect a magnetic field corresponding to the eddy current generated in the conductor W1 by each detection coil 12 of the pair of coil sensors 10. It is feasible. Further, the operation control unit 62 can execute a process of controlling the operation of the drive mechanism 40 and relatively moving the electric wire W and the housing 30 along the extending direction X. Further, the operation control unit 62 can execute a process of controlling the operation of the display unit 50 and displaying an inspection result on the deterioration of the conductor W1 of the electric wire W.

  The determination unit 63 can execute a process of detecting the deterioration of the conductor W1 of the electric wire W based on the detection values of the magnetic fields detected by the respective detection coils 12 of the pair of coil sensors 10. The detected value of the magnetic field detected by the detection coil 12 corresponds to the output value (amplitude) of the detection signal detected by the detection circuits 22A and 22B according to the induced current flowing through the detection coil 12.

  When the conductor W1 of the electric wire W is deteriorated due to corrosion, the distribution of the eddy current generated by the magnetic field generated by the exciting coil 11 changes in the deteriorated portion, and the eddy current tends to be relatively reduced. As a result, when the conductor W1 of the electric wire W is deteriorated due to corrosion, the detection value detected by the detection coil 12 at the deteriorated portion tends to be relatively small. The detection value detected by the detection coil 12 tends to be relatively small as the degree of deterioration of the conductor W1 is relatively large. Utilizing this, the determination unit 63 can determine the deterioration of the conductor W1 according to the magnitude of the detected value of the magnetic field detected by each detection coil 12. The determination unit 63 can determine that the conductor W1 has deteriorated, for example, when the detection value of the magnetic field detected by each detection coil 12 is smaller than a preset deterioration determination threshold.

  Then, the operation control unit 62 of the present embodiment, when detecting the magnetic field corresponding to the eddy current generated in the conductor W1 by each detection coil 12 as described above, mutually activates each excitation coil 11 of the pair of coil sensors 10. Thus, the accuracy of detection of deterioration of the conductor W1 is improved by generating magnetic fields at different timings.

  For example, as shown in FIG. 5, the operation control unit 62 controls the operations of the oscillation circuit 21 and the switching circuit 23, and first applies an alternating current to one of the excitation coils 11A to generate a magnetic field (time t1). -Time t2). At this timing, the operation control unit 62 causes the detection coil 12A to detect a magnetic field corresponding to the eddy current generated in the conductor W1. Next, the operation control unit 62 controls the operations of the oscillation circuit 21 and the switching circuit 23, and applies an alternating current to the other exciting coil 11B to generate a magnetic field (time t2 to time t3). At this timing, the operation control unit 62 causes the detection coil 12B to detect a magnetic field corresponding to the eddy current generated in the conductor W1. After that, the operation control unit 62 alternately repeats the generation of the magnetic field by the excitation coil 11A (time t3 to time t4) and the generation of the magnetic field by the excitation coil 11B (time t4 to time t5) in the same manner as described above.

  The operation control unit 62 controls the magnetic field generated by the excitation coil 11 of the one coil sensor 10 to suppress the influence on the detection of the magnetic field by the detection coil 12 of the other coil sensor 10 by performing the control as described above. Can be. That is, the operation control unit 62 controls the excitation coil 11 on the opposite side to the detection coil 12 when detecting the magnetic field corresponding to the eddy current generated in the conductor W1 by the detection coil 12 by performing the control as described above. Can be suppressed from being affected by magnetic flux from

  More specifically, the operation control unit 62 of the present embodiment uses the above-described control to cause the pair of excitation coils 11 of the pair of coil sensors 10 to use the same excitation coil 11 facing the electric wire W along the facing direction Y. Processing for generating a magnetic field at different timings toward the inspection target part is executed. Then, the determination unit 63 of the present embodiment sets one set of the detection values detected by the respective detection coils 12 of the pair of coil sensors 10 as the detection value in the inspection target site, and based on the set of detection values. A process for detecting deterioration of the conductor W1 in the inspection target portion is executed. As an example, the determination unit 63 detects the deterioration of the conductor W1 based on the sum of the one set of detection values. For example, the determining unit 63 can determine that the conductor W1 has deteriorated when the sum of the one set of detection values is smaller than a previously determined deterioration determination threshold.

  As described above, the conductor deterioration detection device 1 detects the deterioration of the conductor W1 in the inspection target portion by using the detection values detected by the respective detection coils 12 as one set of detection values in the inspection target portion, thereby detecting the electric wire. It is possible to suppress the influence of the displacement of the W in the facing direction Y. That is, in this case, when the conductor W1 of the electric wire W approaches the detection coil 12 side of the one coil sensor 10 along the facing direction Y, the detection value of the detection coil 12 , While the detection value of the detection coil 12 of the other coil sensor 10 becomes relatively small. Accordingly, the conductor deterioration detection device 1 detects the fluctuation of the detection value of the one detection coil 12 toward the increase side due to the bias of the conductor W1 of the electric wire W toward the one detection coil 12 side, and detects the fluctuation of the detection value of the other detection coil 12 It can be canceled by the fluctuation of the value to the decreasing side. In other words, the sum of the one set of detection values detected by the pair of detection coils 12 at the same inspection target site is a value that hardly depends on the position of the conductor W1 with respect to each detection coil 12. As a result, the conductor deterioration detection device 1 detects the deterioration of the conductor W1 based on the sum of the set of detection values as described above, and thereby determines the positional relationship between the conductor W1 of the electric wire W and the pair of detection coils 12. Can be suppressed along the facing direction Y, the effect of the change can be suppressed, and the detection accuracy can be improved.

  The operation control unit 62 controls the operation of the driving mechanism 40 to relatively move the electric wire W and the housing 30 along the extending direction X, thereby moving the inspection target portion of the electric wire W along the extending direction X. And executes a process of sequentially shifting them. The determination unit 63 repeatedly executes a process of detecting the deterioration of the conductor W1 in the inspection target portion that sequentially moves in the extending direction X with the relative movement between the electric wire W and the pair of coil sensors 10.

  Next, an example of a process related to a conductor deterioration detection method by the conductor deterioration detection device 1 will be described with reference to a flowchart of FIG. The conductor deterioration detection device 1 first inserts the electric wire W into and out of the housing 30 through the electric wire insertion holes 30g of the housing 30 when detecting the conductor deterioration. Thereafter, the conductor deterioration detection device 1 executes the processing shown in FIG. 6 by performing a detection start operation via an operation unit or the like (not shown).

  Specifically, first, the operation control unit 62 of the processing unit 60 controls the operation of the oscillation circuit 21 and the switching circuit 23, and generates an AC current for exciting one of the excitation coils 11, for example, the excitation coil 11A. Then, the alternating current is applied to the exciting coil 11A (step S1). As a result, the excitation coil 11A generates a magnetic field toward the inspection target site facing the electric wire W along the facing direction Y, and generates an eddy current on the surface of the conductor W1 at the inspection target site.

  Next, the operation control unit 62 detects a magnetic field corresponding to the eddy current generated in the conductor W1 by the detection coil 12A via the detection circuit 22A of the detection coil 12A on the same side as the above-described excitation coil 11A. Each detection signal corresponding to the induced current flowing through each detection coil 12A is captured (step S2).

  Next, the operation control unit 62 controls the operation of the oscillation circuit 21 and the switching circuit 23, generates an AC current for exciting the other exciting coil 11B, and applies the AC current to the exciting coil 11B ( Step S3). Thereby, the exciting coil 11B generates a magnetic field toward the same inspection target portion as in step S1, and generates an eddy current on the surface of the conductor W1 at the inspection target portion.

  Next, the operation control unit 62 detects a magnetic field corresponding to the eddy current generated in the conductor W1 by the detection coil 12B via the detection circuit 22B of the detection coil 12A on the same side as the above-described excitation coil 11B. Each detection signal corresponding to the induced current flowing through each detection coil 12B is captured (step S4).

  Next, the determination unit 63 of the processing unit 60 uses the detection value corresponding to the detection signal captured in step S2 and the detection value corresponding to the detection signal captured in step S4 as a detection value in the inspection target portion of the electric wire W. One set is obtained, and the detected values of the one set are added to obtain a total value (step S5).

  Next, the determination unit 63 detects the deterioration of the conductor W1 based on the sum of the one set of detection values obtained in step S5, and stores the detection result of the deterioration in the storage unit 61 (step S6). The determination unit 63 detects the deterioration of the conductor W1 based on, for example, a total value of one set of detection values and a preset deterioration determination threshold.

  Next, the operation control unit 62 determines whether or not a detection end operation has been performed via an operation unit (not shown) or the like (step S7).

  When determining that the detection end operation has not been performed (step S7: No), the operation control unit 62 controls the operation of the drive mechanism 40 and moves the housing 30 with respect to the electric wire W along the extending direction X by a predetermined amount. By moving the electric wire W, the inspection target site on the electric wire W is shifted along the extending direction X (step S8). After that, the operation control unit 62 returns to the process of step S1 and repeatedly executes the subsequent processes.

  When determining that the detection end operation has been performed (step S7: Yes), the operation control unit 62 causes the display unit 50 to display the detection result of the deterioration of the conductor W1 stored in the storage unit 61 in step S4 (step S9). This control is terminated.

  In the conductor deterioration detection device 1 described above, a pair of coil sensors 10 each having an excitation coil 11 and a detection coil 12 are provided to face each other with an electric wire W interposed therebetween. In the conductor deterioration detection device 1, the processing unit 60 generates magnetic fields at mutually different timings by the excitation coils 11 of the pair of coil sensors 10, and detects the magnetic fields detected by the detection coils 12 of the pair of coil sensors 10, respectively. Is performed based on the detected value of the electric wire W to detect the deterioration of the conductor W1 of the electric wire W. By this processing, the conductor deterioration detection device 1 determines the influence of the magnetic field generated by the excitation coil 11 of one coil sensor 10 on the detection of the magnetic field by the detection coil 12 of the other coil sensor 10, as shown in FIG. Can be suppressed. That is, when the detection coil 12 detects a magnetic field corresponding to the eddy current generated in the conductor W1 by the detection coil 12, the conductor deterioration detection device 1 considers that the magnetic flux from the excitation coil 11 on the opposite side to the detection coil 12 affects the detection. Can be suppressed.

  FIG. 8 is a diagram in which the vertical axis is the output (detection value) of the detection coil 12 and the output of the conductor deterioration detection device 1 according to the example is compared with the output of the conductor deterioration detection device according to the comparative example. . The conductor deterioration detection device 1 according to the example has the same configuration as the above-described embodiment. The conductor deterioration detecting device according to the comparative example has a configuration in which magnetic fields are simultaneously generated by the respective exciting coils 11. FIG. 8 shows components T11 and T21 due to the induction magnetic flux from the electric wire W and components T12 and T21 due to the induction magnetic flux from the excitation coil 11 on the opposite side of the detection coil 12 in the output of the detection coil 12 of each of the embodiment and the comparative example. This shows the result of specifying T22 and the component T23 generated by the exciting coil 11 itself on the side opposite to the detection coil 12 by simulation, actual measurement, or the like. As shown in FIG. 8, the conductor deterioration detection device 1 according to the example has no component T23 generated by the exciting coil 11 itself on the opposite side to the detection coil 12 as compared with the conductor deterioration detection device according to the comparative example. It is apparent that the influence of the magnetic field generated by the excitation coil 11 of the one coil sensor 10 on the detection of the magnetic field by the detection coil 12 of the other coil sensor 10 can be suppressed.

  In other words, the conductor deterioration detection device 1 includes, in the output (detection value) of the detection coil 12, the induction magnetic flux from the electric wire W, because there is no component T <b> 23 due to the magnetic flux generated by the excitation coil 11 on the opposite side to the detection coil 12. Can increase the proportion of the component T11. Accordingly, the conductor deterioration detection device 1 can accurately detect a change in the output of the detection coil 12 corresponding to the deterioration of the conductor W1 without being buried in other components. As a result, the conductor deterioration detection device 1 can improve the detection accuracy of the deterioration of the conductor W1. Thus, the conductor deterioration detection device 1 can accurately grasp the degree of deterioration of the conductor W1 in a non-destructive manner, and can be used for, for example, preventive maintenance such as planned replacement of the electric wire W.

  In addition, the conductor deterioration detecting device 1 is configured such that, when electric wires W having various outer diameters are to be inspected, the electric wire W having a relatively small outer diameter is to be inspected. In some cases, the magnetic flux going to the opposite detection coil 12 becomes relatively large. Even in such a case, the conductor deterioration detection device 1 generates the magnetic field at different timings by the respective excitation coils 11 so that the excitation coil 11 from the opposite side to the detection coil 12 as described above. The influence of the magnetic flux can be suppressed. As a result, even when the conductor W having a relatively small outer diameter is to be inspected, the conductor deterioration detecting device 1 can perform the appropriate inspection similarly to the case where the wire W having a relatively large outer diameter is to be inspected. Detection accuracy can be maintained. Therefore, the conductor deterioration detecting apparatus 1 can detect any wire W having various outer diameters without preparing the coil sensors 10 having different sizes according to the wires W having different outer diameters. The detection accuracy of the deterioration of the conductor W1 can be properly and commonly improved even for the electric wire W having the diameter. As a result, the conductor deterioration detecting device 1 can easily and inexpensively reduce the conductor W1 of the wire W having various outer diameters without performing the replacement work of the coil sensor 10 and the housing 30 according to the outer diameter of the wire W. Deterioration can be accurately detected.

  Further, the conductor deterioration detecting device 1 has a configuration in which one oscillation circuit 21 is used both for exciting the exciting coil 11A and for exciting the exciting coil 11B, and a switching circuit 23 having a simple configuration switches these connection relationships. . For this reason, the conductor deterioration detection device 1 can achieve miniaturization of the device.

  More specifically, the conductor deterioration detection device 1 described above generates magnetic fields at different timings toward the same inspection target portion of the electric wire W by the pair of excitation coils 11, and detects the detection values of the pair of detection coils 12. Is used as a set of detection values to detect the deterioration of the conductor W1 at the inspection target site. With this configuration, even when the positional relationship between the conductor W1 of the electric wire W and the pair of detection coils 12 fluctuates along the facing direction Y, the conductor deterioration detection device 1 suppresses the influence of the fluctuation and reduces the deterioration of the conductor W1. Can be detected. With such a configuration, the conductor deterioration detecting device 1 can improve the detection accuracy of the deterioration of the conductor W1 by generating magnetic fields at different timings by the respective exciting coils 11 as described above. As a result, the conductor deterioration detecting device 1 can improve the detection accuracy of the deterioration of the conductor W1 while suppressing the influence of the change in the positional relationship between the conductor W1 of the electric wire W and the detection coils 12 along the facing direction Y. it can.

  Here, the conductor deterioration detecting device 1 described above includes the housing 30 and the drive mechanism 40, and the processing unit 60 detects the deterioration of the conductor W1 with the relative movement between the electric wire W and the pair of coil sensors 10. Execute the detection process. As a result, the conductor deterioration detecting device 1 can easily detect the deterioration of the conductor W1 over the entire extending direction X of the electric wire W.

  Note that the conductor deterioration detection device according to the above-described embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope described in the claims.

  In the above description, the drive mechanism 40 has been described as moving the housing 30 along the extending direction X with respect to the electric wire W suspended in the air via a power pole or the like, but is not limited thereto. The drive mechanism 40 may move the electric wire W in the extending direction X with respect to the housing 30. Further, the drive mechanism 40 has been described as including the motor 41, the drive roller 42, and the like, but is not limited thereto.

  In the above description, the oscillation circuit 21 is described as being used for both the excitation of the excitation coil 11A and the excitation of the excitation coil 11B. However, the present invention is not limited to this, and one oscillation circuit may be provided for each. Good.

1 Conductor deterioration detecting device 10, 10A, 10B Coil sensor 11, 11A, 11B Exciting coil 12, 12A, 12B Detection coil 20 Electronic circuit 21 Oscillation circuit 22A, 22B Detection circuit 23 Switching circuit 30 Housing 30a, 30c, 30e, 30f Wall portions 30b, 30d Inner wall surface 30g Electric wire insertion hole 40 Drive mechanism 41 Motor 42 Drive roller 50 Display unit 60 Processing unit 61 Storage unit 62 Operation control unit 63 Judgment unit W Electric wire W1 Conductor W2 Insulating coating Wa Metal strand X Extension direction Y Opposite direction Z Width direction

Claims (3)

A pair of coil sensors each having an excitation coil for generating a magnetic field, and a detection coil for detecting the magnetic field, and provided to face each other with the electric wire interposed therebetween in the facing direction,
Magnetic fields are generated at different timings by the respective exciting coils of the pair of coil sensors, and deterioration of the conductors of the electric wires is performed based on detection values of the magnetic fields detected by the respective detection coils of the pair of coil sensors. And a processing unit that executes a process of detecting
Conductor degradation detector. The processing unit is configured to generate magnetic fields at different timings toward a portion to be inspected that is opposed along the facing direction in the electric wire by the pair of exciting coils of the pair of coil sensors. The detection value detected by the detection coil is set as one of the detection values in the inspection target portion, and a process of detecting the deterioration of the conductor in the inspection target portion based on the one set of the detection values is executed. Do
The conductor deterioration detection device according to claim 1. A housing provided with the pair of coil sensors,
A drive mechanism for relatively moving the electric wire and the housing along the extending direction,
The processing unit executes a process of detecting deterioration of the conductor with the relative movement of the electric wire and the pair of coil sensors,
The conductor deterioration detection device according to claim 1.

Images