Detection device capable of non-destructive failure detection for core tension wire for overhead power transmission line, detection system for core tension wire for overhead power transmission line including same, and failure detection method for core tension wire for overhead power transmission line using same
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-07-04
- Publication Date
- 2026-08-13
Smart Images
Figure KR2025009601_13082026_PF_FP_ABST
Abstract
Description
A detection device capable of non-destructive detection of failure of a center tension wire for an overhead transmission line, a detection system for a center tension wire for an overhead transmission line including the same, and a method for detecting failure of a center tension wire for an overhead transmission line using the same.
[0001] The present invention relates to a detection device capable of non-destructively detecting damage to a center tension wire for an overhead transmission line, a detection system for a center tension wire for an overhead transmission line including the same, and a method for detecting damage to a center tension wire for an overhead transmission line using the same. Specifically, the present invention relates to a detection device capable of non-destructively detecting damage to a center tension wire for an overhead transmission line, which can precisely and conveniently detect whether the internal center tension wire is damaged even when the overhead transmission line is strung and tensioned on a tower without dismantling the finished product form of an overhead transmission line in which multiple conductors are strung around the outer circumference of the center tension wire using a photomultiplier tube (PMT); a detection system for a center tension wire for an overhead transmission line including the same; and a method for detecting damage to a center tension wire for an overhead transmission line using the same.
[0002] There are two methods for supplying electricity from power plants to cities or factories through substations: overhead transmission, which uses overhead transmission lines connected by steel towers, and underground transmission, which uses underground transmission lines buried underground; overhead transmission accounts for about 90% of domestic transmission methods.
[0003] Conventional overhead transmission lines use a central tension wire containing a fiber-reinforced composite material to increase transmission capacity and achieve low sag characteristics, and Figure 1 schematically illustrates the cross-sectional structure of a conventional overhead transmission line equipped with a central tension wire containing a fiber-reinforced composite material.
[0004] As illustrated in FIG. 1, a conventional overhead transmission line may include a central tension line (10) and a conductor line (20) placed around the circumference thereof. Since the conductor line (20) is placed around the central tension line (10) in the conventional overhead transmission line, there is a problem in that it is not possible to check whether the central tension line (10) placed inside the line is damaged immediately before installation of the overhead transmission line.
[0005] Meanwhile, a technique has been applied to check whether the central tension wire (10) is damaged by inserting an optical fiber into the interior of the central tension wire (10), mounting an optical transmission device on one end of the central tension wire (10) to transmit light of a specific wavelength to the optical fiber, and mounting an optical detection device on the other end to check whether the transmitted light is detected, thereby checking whether the optical fiber is damaged. In addition, a technique has been applied to check whether the optical fiber is damaged by pulling out the optical fiber inserted into the interior of the central tension wire (10) from the end and connecting it to equipment such as an OTDR (Optical Time Domain Reflectometer), and checking the optical signal that is reflected back.
[0006] However, in the case of the technology that detects by transmitting light as described above, a light transmission device and a light detection device must be installed at each of the two ends of the center tension wire (10), and in the case of the technology that checks for damage by connecting an OTDR, the optical fiber inserted inside the center tension wire (10) must be pulled out and exposed in order to connect the optical fiber to the OTDR, and there is a problem that the work for detection is cumbersome.
[0007] In particular, in order to extract the optical fiber inserted inside the center tension wire (10) from the end without damage, the optical fiber must be applied in a form mounted on a separate tube. In this case, there is a problem in that it is difficult to accurately detect whether the center tension wire (10) is damaged, such as the optical fiber not being damaged despite the damage of the center tension wire (10), or conversely, the optical fiber being damaged even though the center tension wire (10) is not damaged.
[0008] Meanwhile, a non-destructive inspection method using an induction current probe can be considered. Specifically, an overhead transmission line is placed within an induction current probe and a primary magnetic field is generated by an alternating current to induce eddy currents in the conductor of the overhead transmission line, and the presence or absence of defects is detected by checking the change in the magnetic signal of the primary magnetic field caused by the secondary magnetic field caused by the eddy currents.
[0009] However, while this non-destructive inspection method using an induced current probe can detect not only whether an overhead transmission line is damaged but also the location of the damage, it is impossible to inspect whether the internal center tension line of the overhead transmission line is damaged because the induced eddy currents are concentrated within a few micrometers from the surface of the conductor of the overhead transmission line.
[0010] Therefore, there is an urgent need for a detection device capable of non-destructive damage detection of an internal center tension wire for an overhead transmission line, a detection system for an overhead transmission line center tension wire including the same, and a method for detecting damage of an overhead transmission line center tension wire using the same, which can precisely and conveniently detect whether the internal center tension wire is damaged not only during pre-shipment inspection before installation on a tower without disassembling the finished product form of an overhead transmission line in which multiple conductors are stranded around the outer circumference of the center tension wire, but also when the overhead transmission line is stranded and tensioned on a tower.
[0011] The present invention aims to provide a detection device capable of non-destructive damage detection of a center tension wire for an overhead transmission line, which can precisely and easily detect whether the internal center tension wire is damaged even when the overhead transmission line is strung and tensioned on a tower without dismantling the finished product form of an overhead transmission line in which multiple strands of conductors are strung around the outer circumference of the center tension wire; a detection system for an overhead transmission line center tension wire including the same; and a method for detecting damage of an overhead transmission line center tension wire using the same.
[0012] To solve the above problem, the present invention,
[0013] A non-destructive detection device for a center tension wire for an overhead transmission line is provided, comprising: a housing and a main body including a vacuum tube as a photomultiplier tube (PMT) provided inside the housing that converts light into photoelectrons and amplifies it; a center tension wire socket connected to the housing, to which a center tension wire with one or more optical fibers inserted therein is connected as a detection target; and a cable that receives an output signal from the vacuum tube and transmits it to a terminal device, wherein the vacuum tube includes a photocathode that converts light transmitted through the optical fiber into photoelectrons, a focusing electrode to which a high voltage is applied to focus the photoelectrons, an electron amplifier that amplifies the focused photoelectrons, and an anode to which the amplified photoelectrons are collected as an output signal.
[0014] Herein, the center tension wire socket comprises a connecting socket that is fastened to the housing and a stopper that is detachable from the connecting socket, and the stopper adjusts the length to which the center tension wire is inserted into the interior of the connecting socket so that the center tension wire does not come into direct contact with the photocathode of the detection device, thereby providing a non-destructive detection device for a center tension wire for an overhead transmission line.
[0015] Additionally, the stopper comprises a hollow portion into which a center tension wire is inserted and penetrates, a bolt fastening hole into which a bolt for fixing the inserted center tension wire is inserted, and a bolt inserted into the bolt fastening hole to fix the center tension wire, and the connecting socket comprises a hollow portion into which a center tension wire fastened to the stopper is inserted, a bolt fastening hole into which a bolt for fixing the inserted center tension wire is inserted, a bolt inserted into the bolt fastening hole to fix the center tension wire, and a substrate connected to the detection device.
[0016] Furthermore, the stopper is provided with an expanded hollow portion having a diameter expanded compared to the hollow portion through a step inside the portion connected to the connecting socket, and the connecting socket is provided with a stepped portion having an outer diameter equal to the inner diameter of the expanded hollow portion in the portion connected to the stopper, and the length of the central tension wire exposed through the hollow portion of the stopper being inserted into the hollow portion of the connecting socket is adjusted in such a way that the expanded hollow portion is connected to the stepped portion.
[0017] Meanwhile, the present invention provides a non-destructive detection device for a center tension wire for an overhead transmission line, characterized in that the main body further includes a window provided inside the housing, which is a passage for transmitting light into the vacuum tube.
[0018] In addition, the present invention provides a non-destructive detection device for a center tension wire for an overhead transmission line, characterized in that the cable is a USB cable equipped with a USB terminal connected to the terminal device.
[0019] Meanwhile, a non-destructive detection system for a center tension wire of an overhead transmission line is provided, comprising: a center tension wire into which one or more optical fibers are inserted, or an overhead transmission line having conductor wires arranged around the center tension wire and the center tension wire; a non-destructive detection device for the center tension wire of the overhead transmission line; and a terminal device equipped with software for receiving a signal from the detection device and determining whether the center tension wire is damaged.
[0020] Herein, a non-destructive detection system for a center tension wire for an overhead transmission line is provided, characterized in that the center tension wire comprises a core layer made of fiber-reinforced plastic and one or more optical fibers inserted inside the core layer.
[0021] In addition, the present invention provides a non-destructive detection system for a center tension wire for an overhead transmission line, characterized in that the center tension wire further includes a cover layer made of the same metal material as the conductor wire and surrounding the core layer.
[0022] Meanwhile, a method for detecting whether a central tension wire for an overhead transmission line is damaged using a non-destructive detection system for the central tension wire for an overhead transmission line, comprising: a) connecting one end of the central tension wire to a detection device; b) detecting a blackout output signal through software installed in a terminal device while blocking light penetrating from the other end of the central tension wire; c) detecting an optical output signal through software installed in a terminal device while exposing one or more optical fibers from the other end of the central tension wire to light; and d) determining whether the optical fibers are damaged by comparing the blackout output signal and the optical output signal, and inferring whether the central tension wire is damaged based thereon.
[0023] Herein, a method for detecting whether a center tension wire for an overhead transmission line is damaged is provided, characterized by grinding the cross-sections of both ends before connecting one end of the center tension wire to a detection device in step a).
[0024] In addition, the present invention provides a method for detecting whether a center tension wire for an overhead transmission line is damaged, characterized in that, in step a), the center tension wire with a polished cross-section is fastened to penetrate the hollow portion of the stopper, the center tension wire is fixed in a state where the length exposed through the hollow portion of the stopper is adjusted, the exposed center tension wire is inserted into the hollow portion of the connecting socket, and the center tension wire is fixed in a state where the inserted center tension wire is fixed in a state where the inserted length is adjusted so that the inserted center tension wire does not directly contact the photocathode of the detection device.
[0025] The non-destructive detection device for a center tension wire for an overhead transmission line according to the present invention utilizes a photomultiplier tube (PMT), thereby eliminating the need to mount a separate optical transmission device at the end of the center tension wire or to pull out the optical fiber inserted inside the center tension wire for mounting such a device, nor is it necessary to apply the optical fiber in a form mounted on a separate tube. Consequently, it exhibits an excellent effect of precisely and conveniently detecting whether the internal center tension wire is damaged even when the overhead transmission line is strung and tensioned on a tower without disassembling the finished product of the overhead transmission line in which multiple conductors are strung around the outer circumference of the center tension wire.
[0026] Figure 1 schematically illustrates the cross-sectional structure of a conventional overhead transmission line.
[0027] FIG. 2 schematically illustrates an embodiment regarding the cross-sectional structure of an overhead transmission line applied to a non-destructive detection device for a center tension line for an overhead transmission line according to the present invention.
[0028] FIG. 3 schematically illustrates a non-destructive detection system for a center tension wire for an overhead transmission line according to the present invention.
[0029] Figure 4 is an enlarged view of the center tension wire socket in the non-destructive detection device for the center tension wire for overhead transmission lines shown in Figure 3.
[0030] Figure 5 is a design drawing of the center tension line socket shown in Figure 4.
[0031] Figure 6 is an example of a user interface screen of software installed in a terminal device of a non-destructive detection system for a center tension line for an overhead transmission line shown in Figure 3.
[0032] Figure 7 is a graph evaluating the output signal of the detection device in an embodiment.
[0033] Hereinafter, preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed content is thorough and complete, and to ensure that the spirit of the present invention is sufficiently conveyed to those skilled in the art. Throughout the specification, the same reference numerals indicate the same components.
[0034] FIG. 2 schematically illustrates an embodiment regarding the cross-sectional structure of an overhead transmission line applied to a non-destructive detection device for a center tension line for an overhead transmission line according to the present invention.
[0035] As illustrated in FIG. 2, the overhead transmission line (100) applied to the non-destructive detection device for the central tension line for the overhead transmission line according to the present invention may include a central tension line (110) that withstands the tensile force acting in the longitudinal direction of the overhead transmission line (100), and a conductor line (120) made of aluminum or an aluminum alloy that is arranged around the central tension line (110).
[0036] Specifically, the central tension wire (110) may include a core layer (111) made of fiber-reinforced plastic and one or more optical fibers (112) inserted inside the core layer (111), and optionally may additionally include a cover layer (113) that surrounds the core layer (111), and the cover layer (113) may be made of the same aluminum or aluminum alloy as the conductor wire (120).
[0037] Additionally, the fiber-reinforced plastic may be formed by impregnating reinforcing fibers such as carbon fibers, glass fibers, and synthetic fibers into a thermosetting resin matrix such as epoxy resin, polyester resin, or polyimide resin, and the one or more optical fibers (112) may be arranged at four locations spaced as far apart from each other as shown in FIG. 2a or at three locations spaced as far apart from each other as shown in FIG. 2b.
[0038] FIG. 3 schematically illustrates a non-destructive detection system for a center tension wire for an overhead transmission line according to the present invention.
[0039] As illustrated in FIG. 3, the non-destructive detection system for a center tension wire for an overhead transmission line according to the present invention may include a center tension wire (110) for an overhead transmission line to be detected, a detection device (200) for detecting whether the center tension wire (110) is damaged, a center tension wire socket (300) connecting the center tension wire (110) and the detection device (200), and a terminal device (400) having software installed to receive a signal from the detection device (200) and determine whether the center tension wire (110) is damaged.
[0040] Specifically, the detection device (200) may include a housing (210) and a main body including a vacuum tube (220) as a photomultiplier tube (PMT) provided inside the housing (210) that converts light into photoelectrons and amplifies it, and optionally may include a window (230) which is a passage for transmitting light into the vacuum tube (220), and inside the vacuum tube (220) may be provided a photocathode (221) that converts light transmitted directly, whether through the window (230) or not, into photoelectrons, a focusing electrode (222) to which a high voltage is applied to focus the photoelectrons, an electron amplifier (223) that amplifies the focused photoelectrons by a secondary electron emission effect, and an anode (224) to which the amplified photoelectrons are collected as an output signal, thereby possessing high sensitivity and low noise characteristics, and in particular, since the signal is amplified directly without passing through an external device, very weak light signals It has the advantage of being able to detect signals using natural light without a separate optical transmission device.
[0041] In addition, the center tension wire socket (300) performs the function of connecting one end of the center tension wire (110) and the detection device (200) so that light penetrating through the other end of the center tension wire (110) is transmitted through the optical fiber (112) inside the center tension wire (110) to the detection device (200), and in particular, it can perform the function of preventing noise from occurring by preventing external light from penetrating through the connection part between one end of the center tension wire (110) and the detection device (200).
[0042] FIG. 4 is an enlarged view of the center tension wire socket in the non-destructive detection device for the center tension wire for overhead transmission lines shown in FIG. 3, and FIG. 5 is a design drawing of the center tension wire socket shown in FIG. 4.
[0043] As illustrated in FIGS. 4 and 5, the center tension line socket (300) may be composed of a connecting socket (310) and a stopper (320) that is detachable from the connecting socket (310), and as illustrated in FIG. 4a, the center tension line (110) may be fastened to the stopper (320), and as illustrated in FIG. 4b, the stopper (320) may be fastened to the connecting socket (310) connected to the detection device (200).
[0044] Here, the stopper (320) performs the function of adjusting the length at which the center tension wire (110) is inserted into the interior of the connection socket (310), thereby preventing the center tension wire (110) from penetrating the connection socket (310) and directly contacting the window (230) or photocathode (221) of the detection device (200), so as to prevent the center tension wire (110) from damaging the window (230) or photocathode (221) of the detection device (200).
[0045] Specifically, as illustrated in FIGS. 4a and 5a, the connecting socket (310) may include a hollow portion (311) into which a center tension wire (110) fastened to the stopper (320) is inserted and penetrates, a bolt fastening hole (314) for fixing the center tension wire (110) inserted into the hollow portion (311), a bolt inserted into the bolt fastening hole (314), a substrate (313) connected to the detection device (200), and the substrate (313) may be provided with a fastening hole (313a) for a bolt fastened to the detection device (200). As illustrated in FIGS. 4b and 5b, the stopper (320) may include a hollow portion (321) into which a center tension wire (110) is inserted, a bolt fastening hole (323) into which a bolt for fixing the inserted center tension wire (110) is inserted, and a center tension wire inserted into the bolt fastening hole (323). It may include fixing bolts, etc.
[0046] Here, the center tension line (110) is inserted into the hollow portion (321) through one end of the stopper (320) and is fixed with a bolt inserted through the bolt fastening hole (323) of the stopper (320) so that the length of the center tension line (110) that penetrates the hollow portion (321) of the stopper (320) and is exposed for a certain length can be adjusted.
[0047] Next, the stopper (320) is provided with an expanded hollow portion (322) having an expanded diameter compared to the hollow portion (321) through a step inside the part that is fastened to the connecting socket (310), and the connecting socket (310) is provided with a stepped portion (312) having an outer diameter equal to the inner diameter of the expanded hollow portion (322) in the part that is fastened to the stopper (320), so that the length of the central tension line (110) exposed through the hollow portion (321) of the stopper (320) being inserted into the hollow portion (311) of the connecting socket (310) can be adjusted in such a way that the expanded hollow portion (322) is fastened to the stepped portion (312), and the central tension line (110) inserted into the hollow portion (311) of the connecting socket (310) with the adjusted length is the bolt fastening hole (314) of the connecting socket (310). It can be secured with a bolt inserted through.
[0048] Thus, the central tension line (110) can be prevented from penetrating the connection socket (310) and directly contacting the window (230) or photocathode (221) of the detection device (200), thereby preventing damage to the window (230) or photocathode (221).
[0049] Meanwhile, the detection device (200) may be equipped with a cable (240), such as a USB cable, that transmits an output signal collected at the positive electrode from an internal vacuum tube (220) to a terminal device (400), and the terminal device (400) may analyze the output signal received through the cable (240) to determine whether the optical fiber (112) mounted inside the center tension wire is damaged and whether the center tension wire (110) is damaged accordingly, and FIG. 6 is an example of a user interface screen of software installed on the terminal device (400).
[0050] The present invention relates to a method for detecting whether a center tension wire is damaged using the center tension wire detection system for overhead transmission lines described above.
[0051] A method for detecting whether a central tension wire for an overhead transmission line is damaged according to the present invention may include: a) a step of drawing out a central tension wire from one end of an overhead transmission line having one or more optical fibers inserted inside and a conductor wire arranged around the central tension wire and connecting it to a detection device according to the present invention; b) a step of connecting a cable provided in the detection device to a terminal device; c) a step of detecting a dark current output signal through software installed in the terminal device while blocking light penetrating to the end of the central tension wire from the other end of the central tension wire; and d) a step of determining whether the optical fiber is damaged by comparing it with the dark current output signal by detecting a light output signal (flash on) through software installed in the terminal device while one or more optical fibers exposed to the end of the central tension wire from the other end of the central tension wire are exposed to light, and inferring whether the central tension wire is damaged based thereon.
[0052] In other words, by comparing the dark current output signal and the flash on output signal, if the flash on output signal has a higher value than the dark current output signal, it can be inferred that the optical fiber is undamaged and the center tension wire is not broken; conversely, if the flash on output signal does not differ from the dark current output signal even after the optical fiber at the end of the center tension wire is exposed to light, it can be inferred that the optical fiber is damaged and the center tension wire is broken.
[0053] The center tension wire for overhead transmission lines can be manufactured in the order of manufacturing the core part of the center tension wire -> forming the cover layer -> arranging the conductor wire, and the finished overhead transmission line is strung so as to be stretched between towers, and after applying tension by pulling one end of the overhead transmission line strung between towers, clamps are attached to both ends of the overhead transmission line and each clamp is fastened to the tower to be laid.
[0054] Here, the method for detecting whether a center tension wire for an overhead transmission line is damaged according to the present invention can be used in each of the following steps: after manufacturing the core portion of the center tension wire, after forming a cover layer, after manufacturing a finished product by arranging conductor wires, after stranding the overhead transmission line between towers, and after applying tension by pulling one end of the overhead transmission line stranded between towers, that is, before mounting clamps on both ends of the overhead transmission line.
[0055] Specifically, in step a), since the cross-section of the center tension wire at both ends of the overhead transmission line may not expose the optical fiber (112) mounted inside or the surface may be uneven, causing light to bend or reflect, detection errors may occur. Therefore, the cross-section may be smoothed using a grinder or sandpaper, and after polishing so that the optical fiber (112) is exposed at the cross-section of the center tension wire, it can be connected to the detection device or exposed to light. In particular, since the optical fiber of the center tension wire is not physically connected to the photomultiplier tube (PMT) type detection device, the measured current value may differ depending on the degree of polishing of the cross-section of the center tension wire. That is, the smoother the cross-section of the center tension wire, the easier it is for light to be incident and emitted, which can have a direct effect on the amount of light transmitted to the PMT type detection device.
[0056] As described above, the center tension wire (110) drawn from one end of the overhead transmission line (100) and having its cross-section polished is fastened to the stopper (320) of the center tension wire socket (300), and the center tension wire (110) is fixed in a state where the exposed length is adjusted by passing through the hollow portion (321) of the stopper (320), and then the exposed center tension wire (110) is inserted into the hollow portion (311) of the connection socket (310), and the center tension wire (110) is fixed in a state where the inserted length is adjusted so that the inserted center tension wire (110) does not directly contact the window (230) or the photocathode (221) of the detection device (200), thereby connecting the center tension wire (110) and the detection device (200).
[0057] In addition, in step d), the method of exposing one or more optical fibers exposed at the end of the center tension wire polished at the other end of the overhead transmission line to light can preferably be such that natural light is naturally irradiated, and in addition to natural light, a method of shining a mobile phone flash, portable flash, laser pointer, etc., onto the optical fiber can be used.
[0058] [Example]
[0059] A center tension wire for an overhead transmission line was manufactured with a structure as shown in Fig. 2(a), and four optical fibers were placed on the center tension wire. Additionally, based on the detection system for the center tension wire for an overhead transmission line as shown in Fig. 3, polishing was performed on both ends of the center tension wire using a polishing machine. Then, one end of the center tension wire was connected to a detection device, and a blackout output signal was detected at the other end of the center tension wire while light was blocked. Then, an optical output signal (expose) was detected at the other end of the center tension wire in the case where all four optical fibers placed on the center tension wire were exposed to natural light (Fig. 7a) and in the case where one of the four optical fibers placed on the center tension wire was sequentially exposed to natural light (Fig. 7b). By comparing the blackout output signal (blackout) and the optical output signal (expose) through the graph shown in Fig. 7, which can be obtained through the software of the terminal device, the presence of optical fiber damage and the resulting damage to the center tension wire were detected.
[0060] As can be seen in Figures 7a and 7b, when comparing the blackout output signal and the light output signal, the current value when the optical fiber of the center tension wire is exposed to natural light (expose) was higher than the current value when the optical fiber of the center tension wire is not exposed to natural light (blackout), confirming that neither the optical fiber nor the center tension wire was damaged.
[0061] In Fig. 7b, the current value of the third optical fiber showed a tendency to decrease slightly and then increase, which is because the amount of light was momentarily reduced due to clouds or shadows at the time of measurement. Since the magnitude of the current value in the PMT type detector varies in proportion to the light intensity, it is judged that the optical fiber and the center tension wire are not damaged even if the current value is measured to be larger in the exposure signal than in the blackout output signal.
[0062] As another embodiment, based on a detection system for a center tension wire for an overhead transmission line as shown in FIG. 3, polishing was performed on both ends of the center tension wire using the polishing method described in Table 1 below, and one end was connected to a detection device. A dark current output signal was detected with the other end with light blocked, and a light output signal (flash on) was detected by exposing the optical fiber of the center tension wire to a light source described in Table 1 below. The optical fiber damage and the resulting damage to the center tension wire were detected through the graph shown in FIG. 8, which can be obtained through the software of the terminal device.
[0063]
[0064] As shown in Fig. 8, when comparing the dark current and flash on output signals in all embodiments regardless of the type of light source and polishing method, the flash on output signal was higher than the dark current output signal, confirming that neither the optical fiber nor the center tension wire into which the optical fiber is inserted was damaged. If, despite exposing one or more optical fibers at the end of the center tension wire to light, the dark current and flash on output signals appear identical, it can be inferred that the optical fiber is damaged and the center tension wire is broken.
[0065] Comparing the above embodiments, it can be confirmed that the current value when exposed to natural light is higher than the current value when exposed to a mobile phone flash, etc. This is believed to be because the light intensity of a mobile phone flash and similar devices is limited and has a restricted spectrum, whereas natural light has a higher light source intensity and includes a broader spectrum ranging from ultraviolet to infrared, and the degree of polishing of the cross-section of the center tension line also appears to have had some influence.
[0066] Although this specification has been described with reference to preferred embodiments of the present invention, those skilled in the art may modify and change the present invention in various ways without departing from the spirit and scope of the present invention as described in the claims below. Therefore, if a modified embodiment basically includes the components of the claims of the present invention, it should be considered to be included within the technical scope of the present invention.
Claims
1. A non-destructive detection device for a center tension wire for overhead transmission lines, A main body comprising a housing and a vacuum tube as a photomultiplier tube (PMT) provided inside the housing for converting light into photoelectrons and amplifying it; A center tension wire socket connected to the above housing, with one or more optical fibers inserted therein as a detection target, and a center tension wire socket connected thereto; and It includes a cable that receives an output signal from the above vacuum tube and transmits it to a terminal device, A non-destructive detection device for a central tension wire for an overhead transmission line, comprising: a vacuum tube that converts light transmitted through the optical fiber into photoelectrons; a focusing electrode to which a high voltage is applied to focus the photoelectrons; an electron amplifier that amplifies the focused photoelectrons; and an anode to which the amplified photoelectrons are collected as an output signal.
2. In Paragraph 1, A non-destructive detection device for a center tension wire of an overhead transmission line, wherein the center tension wire socket comprises a connecting socket that is fastened to the housing and a stopper that is detachable from the connecting socket, and the stopper adjusts the length to which the center tension wire is inserted into the interior of the connecting socket so as not to directly contact the photocathode of the detection device.
3. In Paragraph 2, The stopper comprises a hollow portion through which a center tension wire is inserted and penetrates, a bolt fastening hole into which a bolt for fixing the inserted center tension wire is inserted, and a bolt inserted into the bolt fastening hole to fix the center tension wire. A non-destructive detection device for a center tension wire for an overhead transmission line, characterized in that the above-described connecting socket includes a hollow portion into which a center tension wire fastened to the stopper is inserted, a bolt fastening hole into which a bolt for fixing the inserted center tension wire is inserted, a bolt inserted into the bolt fastening hole to fix the center tension wire, and a substrate connected to the detection device.
4. In Paragraph 3, The above stopper is provided with an expanded hollow portion having a diameter expanded compared to the hollow portion through a step inside the part that is fastened to the connecting socket, and The above connecting socket is provided with a stepped portion having an outer diameter equal to the inner diameter of the expanded hollow portion in the part connected to the stopper, A non-destructive detection device for a center tension wire for an overhead transmission line, characterized in that the length of the center tension wire, which is exposed by penetrating the hollow portion of the stopper and inserted into the hollow portion of the connecting socket, is adjusted so that the expanded hollow portion is fastened to the stepped portion.
5. In any one of paragraphs 1 through 4, A non-destructive detection device for a center tension wire for an overhead transmission line, characterized in that the main body further includes a window, which is a passage for transmitting light into the vacuum tube and is provided inside the housing.
6. In any one of paragraphs 1 through 4, A non-destructive detection device for a center tension wire for an overhead transmission line, characterized in that the above cable is a USB cable equipped with a USB terminal connected to the above terminal device.
7. A central tension wire into which one or more optical fibers are inserted, or an overhead transmission line having conductor wires arranged around the central tension wire and the central tension wire; A non-destructive detection device for a center tension wire for an overhead transmission line according to claim 4; and A non-destructive detection system for a center tension wire for an overhead transmission line, comprising a terminal device equipped with software for receiving a signal from the detection device and determining whether the center tension wire is damaged.
8. In Paragraph 7, A non-destructive detection system for a central tension wire for an overhead transmission line, characterized in that the central tension wire comprises a core layer made of fiber-reinforced plastic and one or more optical fibers inserted inside the core layer.
9. In Paragraph 8, A non-destructive detection system for a center tension wire for an overhead transmission line, characterized in that the center tension wire further includes a cover layer made of the same metal material as the conductor wire and surrounding the core layer.
10. A method for detecting whether a center tension wire for an overhead transmission line is damaged using a non-destructive detection system for a center tension wire for an overhead transmission line according to Paragraph 7, a) A step of connecting one end of the center tension line to a detection device, b) A step of detecting a blackout output signal through software installed on a terminal device while blocking light penetrating from the other end of the center tension line, c) a step of detecting an optical output signal through software installed in a terminal device while one or more optical fibers are exposed to light at the other end of the center tension line, and d) A method for detecting whether a center tension wire for an overhead transmission line is damaged, comprising the step of determining whether the optical fiber is damaged by comparing the blackout output signal and the optical output signal, and inferring whether the center tension wire is damaged based thereon.
11. In Paragraph 10, A method for detecting whether a center tension wire for an overhead transmission line is damaged, characterized by grinding the cross-sections of both ends before connecting one end of the center tension wire to a detection device in step a).
12. In Paragraph 11, A method for detecting whether a center tension wire for an overhead transmission line is damaged, characterized by fastening a center tension wire with a polished cross-section in step a) above so as to penetrate the hollow portion of the stopper, fixing the center tension wire in a state where the length exposed through the hollow portion of the stopper is adjusted, inserting the exposed center tension wire into the hollow portion of the connecting socket, and fixing the center tension wire in a state where the inserted center tension wire is fixed in a state where the inserted length is adjusted so that the inserted center tension wire does not directly contact the photocathode of the detection device.