Power transmission line monitoring device, driving jig, and inspection method

Abstract

This power transmission line monitoring device comprises a current transformer (CT) for power generation that includes an annular core member for surrounding a power transmission line, wherein, in a state in which the power transmission line monitoring device is attached to the power transmission line, a space that allows a coated wire to be wrapped around the core member along the extension direction of the power transmission line is formed between the power transmission line and the core member.

Description

[Technical Field]

[0001] The present disclosure relates to a power transmission line monitoring device, a driving jig, and an inspection method. This application claims priority based on Japanese Patent Application No. 2022-133447, filed on August 24, 2022, the disclosure of which is incorporated herein in its entirety. [Background technology]

[0002] Patent Document 1 (JP 2019-124515 A) discloses the following electric wire temperature measuring device: That is, the electric wire temperature measuring device includes a temperature sensor unit that contacts an electric wire and measures the temperature of the electric wire, a power supply current transformer unit that is arranged in a ring shape to surround the electric wire and generates electric power by electromagnetic induction from a magnetic field generated around the electric wire, a wireless unit that is connected to the temperature sensor and the power supply current transformer unit and that wirelessly transmits temperature data of the electric wire measured by the temperature sensor unit to the outside using power from the power supply current transformer unit, a main body unit that holds the power supply current transformer unit and the wireless unit on the outside of the electric wire, and a clamp that is connected to one end of the main body unit in the axial direction of the electric wire, holds the electric wire, and fixes the one end of the main body unit to the electric wire, and the temperature sensor unit is arranged on the opposite side of the clamp across the main body unit in the axial direction of the electric wire, and is separated from the clamp. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-124515 Summary of the Invention

[0004] The power transmission line monitoring device of the present disclosure is a power transmission line monitoring device equipped with a power generating CT (Current Transformer) including an annular core member for surrounding the power transmission line, and when the power transmission line monitoring device is attached to the power transmission line, a space is formed between the power transmission line and the core member in which a coated wire can be wound around the core member along the extension direction of the power transmission line. [Brief explanation of the drawings]

[0005] [Figure 1] FIG. 1 is a perspective view schematically illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view schematically illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 3] FIG. 3 is a side view schematically illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 4] FIG. 4 is a plan view schematically illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 5] FIG. 5 is a functional block diagram illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 6] FIG. 6 is a diagram illustrating a configuration of a power generation CT in a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 7] FIG. 7 is a diagram illustrating a configuration of a measurement CT in a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 8] FIG. 8 is a plan view schematically illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 9] FIG. 9 is a cross-sectional view schematically illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 10] FIG. 10 is a front view schematically illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 11] FIG. 11 is a front view schematically illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 12]FIG. 12 is a plan view illustrating a procedure for installing a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 13] FIG. 13 is a plan view illustrating a procedure for installing a power line monitoring device according to an embodiment of the present disclosure. [Figure 14] FIG. 14 is a diagram illustrating a configuration of a driving jig according to an embodiment of the present disclosure. [Figure 15] FIG. 15 is a diagram illustrating an inspection procedure for a power transmission line monitoring device using a driving jig according to an embodiment of the present disclosure. [Figure 16] FIG. 16 is a perspective view schematically illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 17] FIG. 17 is a front view schematically illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 18] FIG. 18 is a side view schematically illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 19] FIG. 19 is a cross-sectional view schematically illustrating a configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. [Figure 20] FIG. 20 is a flowchart defining an example of an operation procedure when inspecting a power transmission line monitoring device using a driving jig according to an embodiment of the present disclosure. [Figure 21] FIG. 21 is a front view schematically illustrating a configuration of a power transmission line monitoring device according to a first modification of the embodiment of the present disclosure. [Figure 22] FIG. 22 is a plan view schematically illustrating a configuration of a power transmission line monitoring device according to a second modification of the embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0006] In recent years, in order to improve the efficiency of power line maintenance, a technology has been proposed in which a monitoring device equipped with a sensor is attached to the power line and the measurement results of the sensor are monitored. Such monitoring devices often use a current transformer (CT) that can generate power by itself using induced current, as this has the advantage of eliminating the need for periodic maintenance and replacement work.

[0007] [Problem to be solved by this disclosure] With the technology described in Patent Document 1, it may be difficult to check the operation of the electric wire temperature measuring device when it is attached to the electric power transmission line.

[0008] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide a power transmission line monitoring device, a driving jig, and an inspection method that make it possible to easily check the operation of a power transmission line monitoring device attached to a power transmission line.

[0009] [Effects of this disclosure] According to the present disclosure, it is possible to easily check the operation of a power transmission line monitoring device attached to a power transmission line.

[0010] [Description of the embodiments of the present disclosure] First, the contents of the embodiments of the present disclosure will be listed and described.

[0011] (1) A power transmission line monitoring device according to an embodiment of the present disclosure is a power transmission line monitoring device equipped with a power generating CT including an annular core member for surrounding a power transmission line, and when the power transmission line monitoring device is attached to the power transmission line, a space is formed between the power transmission line and the core member in which a coated wire can be wound around the core member along the extension direction of the power transmission line.

[0012] With this configuration, with the transmission line monitoring device attached to the transmission line, a covered wire can be passed through the space between the transmission line and the core member, and AC current can be supplied to the covered wire to cause the power generating CT to generate power. As a result, even when the transmission line is out of service, the operation of the transmission line monitoring device can be checked by driving it with the power generated by the power generating CT, just as when the transmission line is in operation. This makes it easy to check the operation of the transmission line monitoring device attached to the transmission line.

[0013] (2) A power transmission line monitoring device according to an embodiment of the present disclosure is a power transmission line monitoring device equipped with a power generation CT including an annular core member for surrounding a power transmission line, and is equipped with a covered wire wound around the core member and supplied with alternating current from outside the power transmission line monitoring device when the power transmission line monitoring device is attached to the power transmission line, and the covered wire is used to cause the power generation CT to generate electricity.

[0014] With this configuration, with the power transmission line monitoring device attached to the power transmission line, AC current can be supplied to the covered wire to cause the power generating CT to generate power. As a result, even when the power transmission line is out of service, the power generated by the power generating CT can be used to drive the power transmission line monitoring device and check its operation, just as when the power transmission line is in operation. Furthermore, the configuration of the driving jig for driving the power transmission line monitoring device can be simplified. Furthermore, after attaching the power transmission line monitoring device to the power transmission line, the covered wire can be used to repeatedly check the operation of the power transmission line monitoring device.

[0015] (3) A driving jig according to an embodiment of the present disclosure is a driving jig for driving a power transmission line monitoring device equipped with a power generating CT including an annular core member, the driving jig comprising: a winding section including a coated wire wound around the core member, the winding section causing the power generating CT to generate electricity; and a load for setting the alternating current flowing through the winding section.

[0016] With this configuration, when the power transmission line monitoring device is attached to the power transmission line, AC current can be supplied to the windings to cause the power generating CT to generate electricity. As a result, even when the power transmission line is out of service, the power generated by the power generating CT can be used to drive the power transmission line monitoring device, just as when the power transmission line is in operation. This makes it easy to check the operation of the power transmission line monitoring device attached to the power transmission line.

[0017] (4) In the above (3), the AC current flowing through the insulated wire and the number of turns of the winding section may be set so that the power generated by the power generating CT using the AC current flowing through the winding section is equal to or greater than the minimum driving power of the power transmission line monitoring device.

[0018] With this configuration, the power transmission line monitoring device can be driven by the power generated by the power generating CT, and the operation of the power transmission line monitoring device can be checked.

[0019] (5) In the above (4), when the power transmission line monitoring device is attached to the power transmission line, a gap may be formed between the power transmission line monitoring device and the power transmission line, and the thickness of the insulated wire may be such that the insulated wire with the number of turns can be passed through the gap.

[0020] With this configuration, no special design changes are required for the power transmission line monitoring device to wind the covered wire around the core member, and it is possible to check the operation of a conventional power transmission line monitoring device that is attached to a power transmission line.

[0021] (6) In any one of the above (3) to (5), the driving jig may further include a power supply unit that supplies AC current to the winding unit and the load.

[0022] With this configuration, it is possible to drive the power transmission line monitoring device and check the operation of the power transmission line monitoring device in a location where commercial power cannot be used, such as outdoors.

[0023] (7) In any one of the above (3) to (6), the load may be capable of adjusting the setting of the AC current flowing through the winding portion.

[0024] With this configuration, the AC current flowing through the winding section can be adjusted according to, for example, the minimum drive power of the power transmission line monitoring device, so that the driving jig can be used to check the operation of multiple types of power transmission line monitoring devices with different minimum drive powers.

[0025] (8) An inspection method according to an embodiment of the present disclosure is a method for inspecting a power transmission line monitoring device equipped with a power generating CT including an annular core member using a driving jig including a covered wire, and includes the steps of attaching the power transmission line monitoring device to a power transmission line with the core member divided, winding the covered wire around a portion of the divided core member, attaching the divided core member to surround the power transmission line, and supplying an alternating current to the covered wire to drive the power transmission line monitoring device.

[0026] With this method, even when the power transmission line is out of service, the operation of the power transmission line monitoring device can be checked by driving it with the power generated by the power generating CT, just as when the power transmission line is in operation. Therefore, the operation of the power transmission line monitoring device attached to the power transmission line can be checked easily.

[0027] (9) In the above (8), the inspection method may further include the step of, after driving the power transmission line monitoring device, cutting the covered wire to remove the covered wire from the core member.

[0028] This method allows the coated wire to be removed from the core member without removing the core member from the power transmission line. Therefore, compared to a method in which the core member is divided in order to remove the coated wire from the core member after confirming operation, it is possible to start operation of the power transmission line monitoring device while maintaining the installation state of the power transmission line monitoring device at the time of operation confirmation, without causing any abnormalities such as improper installation of the core member after confirming operation.

[0029] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, identical or corresponding parts are designated by the same reference numerals, and their description will not be repeated. Furthermore, at least some of the embodiments described below may be combined in any manner.

[0030] <Power line monitoring device> 1 is a perspective view schematically illustrating the configuration of a power transmission line monitoring device according to an embodiment of the present disclosure, showing a power transmission line monitoring device 101 attached to a power transmission line 201.

[0031] 1, power transmission line monitoring device 101 is attached to power transmission line 201. Power transmission line monitoring device 101 performs measurements on power transmission line 201 and transmits the measurement results to a device external to power transmission line monitoring device 101. For example, power transmission line 201 is an uncovered overhead power transmission line. Note that power transmission line 201 may also be an underground power transmission line.

[0032] Fig. 2 is a perspective view schematically illustrating the configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. Fig. 3 is a side view schematically illustrating the configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. Fig. 4 is a plan view schematically illustrating the configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. Figs. 2 to 4 show the power transmission line monitoring device 101 when not attached to a power transmission line 201.

[0033] 2 to 4, power line monitoring device 101 includes housing 11, grip portion 12, hinge portion 13, fastening portions 14A and 14B, and antenna 90. As shown in FIG.

[0034] The housing 11 has a cylindrical shape and has a through hole 10 for passing the power transmission line 201 along the axial direction. The housing 11 includes a lower housing 11A and an upper housing 11B. The lower housing 11A and the upper housing 11B have a semi-cylindrical shape.

[0035] The fastening portions 14A are provided at first and second circumferential ends of the lower housing 11A. The fastening portions 14B are provided at first and second circumferential ends of the upper housing 11B. The fastening portions 14A and 14B have through holes and are fastened to each other using bolts and nuts. This fixes the lower housing 11A and the upper housing 11B to each other. Meanwhile, the housing 11 can be opened and closed when the fastening portions 14A and 14B are not fastened to each other using screws. In this specification, the terms "first" and "second" do not imply any priority.

[0036] The gripping portion 12 is provided at a first axial end of the housing 11. The gripping portion 12 includes a lower clamp portion 12A and an upper clamp portion 12B. The lower clamp portion 12A is connected to the lower housing 11A by, for example, welding.

[0037] The gripping portion 12 grips the power transmission line 201. More specifically, the lower clamp portion 12A has a recessed portion on its surface facing the upper clamp portion 12B, into which the power transmission line 201 fits. The upper clamp portion 12B has a recessed portion on its surface facing the lower clamp portion 12A, into which the power transmission line 201 fits. The lower clamp portion 12A and the upper clamp portion 12B have through holes, and are fastened to each other with bolts and nuts, with the power transmission line 201 fitted in each recess. In this way, the power transmission line monitoring device 101 is fixed to the power transmission line 201.

[0038] Hinge portion 13 is provided at fastening portion 14A at a first end in the circumferential direction of lower housing 11A and at fastening portion 14B at a first end in the circumferential direction of upper housing 11B. More specifically, hinge portion 13 connects fastening portions 14A and 14B in an openable manner.

[0039] Fig. 5 is a functional block diagram showing the configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. Referring to Fig. 5, the power transmission line monitoring device 101 includes a power generation CT 40, a measurement CT 50, an AC / DC conversion unit 60, a communication unit 70, a temperature sensor 80, and an antenna 90. A part or all of the communication unit 70 is realized by, for example, a processing circuit including one or more processors. The measurement CT 50 and the temperature sensor 80 are examples of a measurement unit.

[0040] 6 is a diagram illustrating the configuration of a power generation CT in a power transmission line monitoring device according to an embodiment of the present disclosure. Referring to FIG. 6, power generation CT 40 includes an annular core member 41 for surrounding power transmission line 201, and a coil 42. Core member 41 is formed of a magnetic material such as ferrite. Coil 42 is wound around core member 41.

[0041] The core member 41 has a lower core member 41 A and an upper core member 41 B. As will be described later, the lower core member 41 A is provided in the lower housing 11 A, and the upper core member 41 B is provided in the upper housing 11 B.

[0042] The power generating CT 40 generates power using the AC current flowing through the power transmission line 201. More specifically, with the power transmission line monitoring device 101 attached to the power transmission line 201, the power generating CT 40 generates AC power by electromagnetic induction using the coil 42 from magnetic field changes that occur around the power transmission line 201 due to the AC current flowing through the power transmission line 201. The power generating CT 40 outputs the AC power generated in the coil 42 to the AC / DC conversion unit 60.

[0043] 7 is a diagram illustrating the configuration of a measurement CT in a power transmission line monitoring device according to an embodiment of the present disclosure. Referring to FIG. 7, measurement CT 50 includes an annular core member 51 for surrounding power transmission line 201, and a coil 52. Core member 51 is formed of a magnetic material such as ferrite. Coil 52 is wound around core member 51.

[0044] The core member 51 has a lower core member 51 A and an upper core member 51 B. As will be described later, the lower core member 51 A is provided in the lower housing 11 A, and the upper core member 51 B is provided in the upper housing 11 B.

[0045] The measurement CT 50 performs measurements on the power transmission line 201. More specifically, the measurement CT 50 outputs an induced current corresponding to the AC current flowing through the power transmission line 201. Specifically, when the power transmission line monitoring device 101 is attached to the power transmission line 201 and an AC current flows through the power transmission line 201, an induced current corresponding to the AC current flows through the coil 52 due to inductive coupling. The coil 52 outputs the induced current to the communication unit 70.

[0046] 5, AC / DC conversion unit 60 converts into DC power the AC power received from power generation CT 40. AC / DC conversion unit 60 supplies the DC power to communication unit 70 and temperature sensor 80.

[0047] The temperature sensor 80 performs measurements related to the power transmission line 201. More specifically, the temperature sensor 80 outputs a signal indicating the temperature of the power transmission line 201 to the communication unit 70. The temperature sensor 80 may be a thermocouple, a thermistor, or any other sensor capable of measuring the temperature of the power transmission line 201.

[0048] The communication unit 70 transmits the measurement results from the measurement CT 50 and the measurement results from the temperature sensor 80 to an external device outside the power transmission line monitoring device 101. More specifically, the communication unit 70 generates current measurement information indicating the measurement results of the AC current flowing through the power transmission line 201 based on the induced current received from the coil 52 in the measurement CT 50. The communication unit 70 also generates temperature measurement information indicating the measurement results of the temperature of the power transmission line 201 based on the signal received from the temperature sensor 80. The communication unit 70 generates a wireless signal including the current measurement information and the temperature measurement information, and transmits the generated wireless signal via the antenna 90 to an external device outside the power transmission line monitoring device 101.

[0049] Fig. 8 is a plan view schematically illustrating the configuration of a power transmission line monitoring device according to an embodiment of the present disclosure, showing the power transmission line monitoring device 101 with the housing 11 open.

[0050] 9 is a cross-sectional view taken along line IX-IX in FIG. 8, schematically illustrating the configuration of a power transmission line monitoring device according to an embodiment of the present disclosure.

[0051] 8 and 9, the housing 11 has a double-cylinder structure. More specifically, the lower housing 11A includes a semi-cylindrical lower inner cylinder 21A, a semi-cylindrical lower outer cylinder 22A, and lower lid portions 23A and 24A. The diameter of the lower outer cylinder 22A is larger than the diameter of the lower inner cylinder 21A and is provided to surround the lower inner cylinder 21A. The upper housing 11B includes a semi-cylindrical upper inner cylinder 21B, a semi-cylindrical upper outer cylinder 22B, and upper lid portions 23B and 24B. The diameter of the upper outer cylinder 22B is larger than the diameter of the upper inner cylinder 21B and is provided to surround the upper inner cylinder 21B. When the housing 11 is closed, the lower inner cylinder 21A in the lower housing 11A and the upper inner cylinder 21B in the upper housing 11B form the through-hole 10 of the housing 11 shown in FIG.

[0052] Lower lid portion 23A is a flat plate-like member that connects a first axial end of lower outer cylinder 22A to a first axial end of lower inner cylinder 21A. Lower lid portion 24A is a flat plate-like member that connects a second axial end of lower outer cylinder 22A to a second axial end of lower inner cylinder 21A. Lower inner cylinder 21A, lower outer cylinder 22A, and lower lid portions 23A and 24A form lower accommodation portion 31A, which is an accommodation space.

[0053] The upper lid portion 23B is a flat plate-like member that connects a first axial end of the upper outer cylinder 22B to a first axial end of the upper inner cylinder 21B. The upper lid portion 24B is a flat plate-like member that connects a second axial end of the upper outer cylinder 22B to a second axial end of the upper inner cylinder 21B. The upper inner cylinder 21B, the upper outer cylinder 22B, and the upper lid portions 23B and 24B form an upper accommodation portion 31B, which is an accommodation space.

[0054] The lower accommodating portion 31A accommodates the lower core members 41A and 51A and the communication portion 70. The upper accommodating portion 31B accommodates the upper core members 41B and 51B and the AC / DC conversion portion 60.

[0055] 10 and 11 are front views schematically illustrating the configuration of a power line monitoring device according to an embodiment of the present disclosure. Fig. 10 shows the power line monitoring device 101 with the housing 11 open. Fig. 11 shows the power line monitoring device 101 with the housing 11 closed. In Fig. 10 and 11, the lower core member 41A and the upper core member 41B inside the housing 11 are indicated by dashed lines.

[0056] 10, core member 41 is separated when housing 11 is open. More specifically, lower core member 41A and upper core member 41B are separated from each other and do not come into contact with each other when housing 11 is open.

[0057] 11, core members 41 are integrated when housing 11 is closed. That is, core members 41 are fitted together when housing 11 is closed. More specifically, lower core member 41A and upper core member 41B are in contact when housing 11 is closed. "Lower core member 41A and upper core member 41B are in contact" means that the contact surfaces of lower core member 41A and upper core member 41B are in contact with each other with almost no gap between them. When core members 41 are fitted together, power generating CT 40 is capable of generating power using AC current flowing through power transmission line 201.

[0058] <Installation of power line monitoring equipment> 12 and 13 are plan views illustrating a procedure for installing a power transmission line monitoring device according to an embodiment of the present disclosure.

[0059] Referring to FIG. 12, when attaching the power transmission line monitoring device 101 to the power transmission line 201, first, the housing 11 is opened, and the power transmission line 201 is accommodated inside the lower inner cylinder 21A and in the recesses of the lower clamp portion 12A and the upper clamp portion 12B. Then, the lower clamp portion 12A and the upper clamp portion 12B are screwed together to fix the power transmission line monitoring device 101 to the power transmission line 201.

[0060] Referring to FIG. 13, next, the housing 11 of the power transmission line monitoring device 101 is closed, and the fastening portions 14A and 14B are fastened together with screws.

[0061] <Issues> However, there is a demand for a technique that allows easy confirmation of the operation of the power transmission line monitoring device 101 attached to the power transmission line 201. More specifically, when work is performed to attach the power transmission line monitoring device 101 to the power transmission line 201, the operation of the power transmission line 201 is stopped from the viewpoint of preventing electric shock, etc.

[0062] Therefore, the power transmission line monitoring device 101, which operates using the power generated by the power generating CT 40, does not operate after being attached to the power transmission line 201 until the power transmission line 201 starts operating, and therefore operation checks cannot be performed.

[0063] Regarding the temperature sensor 80 and the communication unit 70, it is possible to check the operation of the temperature sensor 80 and the communication unit 70 by attaching the power transmission line monitoring device 101 to the power transmission line 201, opening the housing 11, and supplying power to the temperature sensor 80 and the communication unit 70 using a battery. However, this only allows checking the operation when the housing 11 is open, i.e., in a state different from the operating state of the power transmission line monitoring device 101.

[0064] Therefore, the power line monitoring device 101, the driving jig 301, and the inspection method according to the embodiment of the present disclosure solve the above problems by using the following configurations.

[0065] <Drive jig> 14 is a diagram illustrating a configuration of a driving jig according to an embodiment of the present disclosure. Referring to FIG. 14, driving jig 301 includes a power supply unit 310, a switch 314, a fuse 315, a load 316, and a winding unit 317. Power supply unit 310 includes a battery 311, a DC / AC conversion unit 312, and a transformer 313. Winding unit 317 includes covered wires 318. Covered wires 318 may be wound with a predetermined number of turns and bundled together, or may not be bundled together. Driving jig 301 is a jig for driving power line monitoring device 101.

[0066] A first end of the covered wire 318 is connected to the fuse 315. A second end of the covered wire 318 is connected to the load 316. As will be described later, the covered wire 318 is wound around a core member 41 in the power transmission line monitoring device 101.

[0067] Power supply unit 310 supplies AC current to winding unit 317 and load 316. More specifically, battery 311 outputs DC power to DC / AC conversion unit 312. DC / AC conversion unit 312 converts the DC power received from battery 311 into AC power of 50 Hz or 60 Hz and outputs it to transformer 313. Transformer 313 converts the voltage level of the AC power received from DC / AC conversion unit 312 to a predetermined level and supplies it to insulated wire 318 via switch 314 and fuse 315, as well as to load 316.

[0068] Load 316 sets the AC current that flows through winding portion 317. More specifically, an AC current that corresponds to the resistance value of load 316 is supplied to winding portion 317. The resistance value of load 316 is set in advance, for example, so that the effective value of the AC current supplied to winding portion 317 is a predetermined value.

[0069] Note that the load 316 may be capable of adjusting the setting of the AC current flowing through the winding portion 317. More specifically, the load 316 may be a variable resistor.

[0070] <Testing procedure> Referring again to FIG. 12, a user inspecting the power transmission line monitoring device 101 using the driving jig 301 first fixes the power transmission line monitoring device 101 to the power transmission line 201 with the core member 41 in a divided state.

[0071] FIG. 15 is a diagram illustrating an inspection procedure for a power transmission line monitoring device using a driving jig according to an embodiment of the present disclosure.

[0072] 15, after fixing the power transmission line monitoring device 101 to the power transmission line 201, the user winds the covered wire 318 of the driving jig 301 around one of the divided core members 41. More specifically, the user hooks the winding portion 317, including the covered wire 318 that has been wound and bundled in advance with a predetermined number of turns, onto the upper housing 11B that houses the upper core member 41B, so that a portion of the winding portion 317 is housed inside the upper inner cylinder 21B. If the covered wire 318 is not bundled, the user winds the covered wire 318 around the upper housing 11B the same number of turns as the bundled number.

[0073] Fig. 16 is a perspective view schematically illustrating the configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. Fig. 16 shows the power transmission line monitoring device 101 attached to a power transmission line 201 with the housing 11 closed.

[0074] Fig. 17 is a front view schematically illustrating the configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. Fig. 17 shows the power transmission line monitoring device 101 attached to a power transmission line 201 with the housing 11 closed.

[0075] 16 and 17 , the user attaches the divided core member 41 so as to surround the power transmission line 201. More specifically, the user closes the housing 11 of the power transmission line monitoring device 101 and screws the fastening portions 14A and 14B together. This causes the covered wire 318 to pass through the through hole 10 and be wound around the housing 11. That is, the winding portion 317 is hung on the core member 41.

[0076] Fig. 18 is a side view schematically illustrating the configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. Fig. 18 shows the power transmission line monitoring device 101 attached to a power transmission line 201 with the housing 11 closed.

[0077] 18, when the power transmission line monitoring device 101 is attached to the power transmission line 201, a gap is formed between the upper housing 11B and the clamp upper part 12B, which allows the covered wire 318 to pass through the through-hole 10. More specifically, the length C2 of the gap formed between the upper housing 11B and the clamp upper part 12B in the axial direction of the power transmission line 201 is, for example, 2.25 millimeters.

[0078] Fig. 19 is a cross-sectional view schematically illustrating the configuration of a power transmission line monitoring device according to an embodiment of the present disclosure. Fig. 19 is a cross-sectional view taken along line XIX-XIX in Fig. 18, and shows the power transmission line monitoring device 101 attached to the power transmission line 201 with the housing 11 closed.

[0079] 17 and 19 , when the power transmission line monitoring device 101 is attached to the power transmission line 201, a gap 17 is formed between the power transmission line 201 and the core member 41 of the power transmission line monitoring device 101, allowing the covered wire 318 to be wound around the core member 41 along the extension direction of the power transmission line 201. More specifically, a gap 17 is formed between the power transmission line 201 and the housing 11, allowing the covered wire 318 to be wound around the housing 11 along the extension direction of the power transmission line 201. The gap 17 is a space where the covered wire 318 can be wound around the core member 41 along the extension direction of the power transmission line 201 when the power transmission line monitoring device 101 is attached to the power transmission line 201. The covered wire 318 passes through the gap 17 and is wound around the housing 11.

[0080] The thickness of the coated wire 318 is such that when the power transmission line monitoring device 101 is attached to the power transmission line 201, the coated wire 318 with the number of turns of the winding portion 317 can be passed through the gap 17 formed between the power transmission line monitoring device 101 and the power transmission line 201.

[0081] More specifically, when the diameter of the power transmission cable 201 is 45.5 mm and the diameter of the through hole 10 is 50 mm, the length C1 of the gap 17 in the radial direction of the power transmission cable 201 is 2.25 mm. In this case, the diameter of the covered wire 318 is set to, for example, 2 mm or less.

[0082] With the covered wire 318 wound through the gap 17 between the power transmission line 201 and the housing 11, the user supplies AC current to the covered wire 318 using the driving jig 301. As a result, the power generating CT 40 in the power transmission line monitoring device 101 generates AC power through electromagnetic induction due to changes in the magnetic field that occur around the winding portion 317 due to the AC current flowing through the winding portion 317, thereby driving each unit in the power transmission line monitoring device 101. With each unit in the power transmission line monitoring device 101 driven, the user checks the operation of the power transmission line monitoring device 101.

[0083] In the driving jig 301, for example, the AC current flowing through the coated wire 318 and the number of turns of the winding section 317 are set so that the power generated by the power generating CT 40 using the AC current flowing through the winding section 317 is equal to or greater than the minimum driving power E1 of the power transmission line monitoring device 101.

[0084] As an example, if it is necessary to pass an AC current of 50 amperes through the winding section 317 in order to cause the power generating CT 40 to generate power equal to or greater than the minimum drive power E1, the AC current supplied to the coated wire 318 by the transformer 313 is set to 1 ampere, and the number of turns of the winding section 317 is set to 50.

[0085] <Testing method> FIG. 20 is a flowchart defining an example of an operation procedure when inspecting a power transmission line monitoring device using a driving jig according to an embodiment of the present disclosure.

[0086] Referring to FIG. 20, first, a user inspecting the power transmission line monitoring device 101 using the driving jig 301 attaches the power transmission line monitoring device 101 to the power transmission line 201 with the core member 41 divided, as shown in FIG. 12 (step S11).

[0087] 15, the user winds the covered wire 318 around a part of the divided core member 41. More specifically, the user takes the covered wire 318, which has been wound with a predetermined number of turns and bundled together, and hooks the winding part 317 onto the upper housing 11B that houses the upper core member 41B so that a part of the winding part 317 is housed inside the upper inner cylinder 21B (step S12).

[0088] Next, as shown in FIGS. 16 to 19, the user closes the housing 11 to attach the divided core members 41 so as to surround the power transmission line 201 (step S13).

[0089] Next, the user supplies AC current to the covered wire 318 using the driving jig 301 to drive the power transmission line monitoring device 101 (step S14).

[0090] Next, the user checks the operation of the power transmission line monitoring device 101 (step S15).

[0091] Next, the user cuts the covered wire 318 and removes the covered wire 318 from the core member 41. More specifically, after checking the operation of the power transmission line monitoring device 101, the user cuts the covered wire 318 and removes the covered wire 318 from the housing 11 without opening the housing 11 (step S16).

[0092] In the driving jig 301 according to the embodiment of the present disclosure, the thickness of the covered wire 318 is set to a thickness that allows the covered wire 318 to pass through the gap 17 formed between the power transmission line monitoring device 101 and the power transmission line 201 when the power transmission line monitoring device 101 is attached to the power transmission line 201, but this is not limited to this. Also, in the power transmission line monitoring device 101, when the power transmission line monitoring device 101 is attached to the power transmission line 201, the gap 17 with length C1 is formed between the power transmission line 201 and the housing 11, allowing the covered wire 318 to be wound around the housing 11 along the extension direction of the power transmission line 201, but this is not limited to this.

[0093] Fig. 21 is a front view schematically illustrating the configuration of a power transmission line monitoring device according to a first modification of an embodiment of the present disclosure. Fig. 21 shows the power transmission line monitoring device 102 attached to a power transmission line 201 with the housing 11 closed. In Fig. 21, the lower core member 41A, the upper core member 41B, the lower inner cylinder 21A, and the upper inner cylinder 21B inside the housing 11 are indicated by dashed lines.

[0094] 21 , in the power transmission line monitoring device 102 according to the first modification, an upper housing 11B is formed with a cylindrical through-hole 15 extending in the axial direction. The through-hole 15 is formed between an upper core member 41B and an upper inner cylinder 21B. The through-hole 15 is a space that allows a covered wire 318 to be wound around the core member 41 along the extension direction of the power transmission line 201 when the power transmission line monitoring device 101 is attached to the power transmission line 201. More specifically, the inner diameter of the through-hole 15 and the thickness of the covered wire 318 are set to values ​​that allow the covered wire 318 to be passed through the through-hole 15 a number of times equal to or greater than the number of turns of the winding portion 317 of the driving jig 301.

[0095] The through hole 15 may be formed between the lower core member 41A and the lower inner cylinder 21A in the lower housing 11A. Furthermore, in the power transmission line monitoring device 102, when the power transmission line monitoring device 102 is attached to the power transmission line 201, the gap 17 through which the covered wire 318 can be wound around the housing 11 along the extension direction of the power transmission line 201 does not have to be formed between the power transmission line 201 and the housing 11.

[0096] A user inspecting the power transmission line monitoring device 102 using the driving jig 301 winds the covered wire 318 around the housing by repeatedly passing the covered wire 318 through the through hole 15 the same number of times as the preset number of turns of the winding portion 317. The step of passing the covered wire 318 through the through hole 15 may be performed before or after the power transmission line monitoring device 101 is fixed to the power transmission line 201, before or after the fastening portions 14A and 14B are fastened to each other with screws.

[0097] Fig. 22 is a plan view schematically illustrating a configuration of a power transmission line monitoring device according to Modification 2 of the embodiment of the present disclosure. In Fig. 22, core member 41 and covered wire 318 inside housing 11 are indicated by dashed lines.

[0098] 22 , compared to the power transmission line monitoring device 101, the power transmission line monitoring device 103 according to the second modification further includes a covered wire 318 wound around the core member 41 and a hole 16 formed in the upper housing 11B. More specifically, the power transmission line monitoring device 103 includes a winding unit 317 including the covered wire 318 pre-wound around the core member 41. A first end 318A and a second end 318B of the covered wire 318 are exposed to the outside of the housing 11 through the hole 16. That is, a portion of the winding unit 317 is housed in the upper housing 31B. The covered wire 318 can receive an AC current from outside the power transmission line monitoring device 103 when the power transmission line monitoring device 103 is attached to the power transmission line 201. More specifically, with the power transmission line monitoring device 103 attached to the power transmission line 201, for example, a first end 318A of the covered wire 318 is connected to a fuse 315 in the driving jig 301, and a second end 318B of the covered wire 318 is connected to a load 316 in the driving jig 301, whereby an AC current can be supplied to the covered wire 318 using the driving jig 301.

[0099] Note that a portion of winding portion 317 may be housed in lower housing portion 31A, and hole 16 may be provided in lower housing 11A. Furthermore, power transmission line monitoring device 103 may be configured to include terminals that enable first end 318A and second end 318B to be exposed to the outside of housing 11, instead of hole 16. As with power transmission line monitoring device 102, power transmission line monitoring device 103 does not necessarily require gap 17 to be formed between power transmission line 201 and housing 11 in a state in which power transmission line monitoring device 103 is attached to power transmission line 201, allowing covered wire 318 to be wound around housing 11 along the extension direction of power transmission line 201.

[0100] A user inspecting the power transmission line monitoring device 103 uses a driving jig 301 that does not include a winding portion 317 to inspect the power transmission line monitoring device 103. Specifically, when checking the operation of the power transmission line monitoring device 103, the user connects a first end 318A of a covered wire 318 in the power transmission line monitoring device 103 to a fuse 315 in the driving jig 301, and connects a second end 318B of the covered wire 318 to a load 316 in the driving jig 301.

[0101] Furthermore, in the driving jig 301 according to the embodiment of the present disclosure, the AC current flowing through the covered wire 318 and the number of turns of the winding portion 317 are set so that the power generated by the power generating CT 40 using the AC current flowing through the winding portion 317 is equal to or greater than the minimum drive power E1 of the power transmission line monitoring device 101, but this is not limited to this. In the driving jig 301, the AC current flowing through the covered wire 318 and the number of turns of the winding portion 317 may be set so that the power generated by the power generating CT 40 using the AC current flowing through the winding portion 317 is less than the minimum drive power E1 and is equal to or greater than the power capable of driving at least one of the temperature sensor 80 and the communication portion 70.

[0102] Furthermore, although the driving jig 301 according to the embodiment of the present disclosure has been described as including the power supply unit 310, the present disclosure is not limited to this. The driving jig 301 may be configured to not include part or all of the power supply unit 310. In this case, the driving jig 301 receives an AC current or a DC current from an external source.

[0103] Furthermore, although the power transmission line monitoring device 101 according to the embodiment of the present disclosure has been described as including the measurement CT 50 and the temperature sensor 80, this is not limiting. The power transmission line monitoring device 101 may be configured to not include either the measurement CT 50 or the temperature sensor 80. Furthermore, the power transmission line monitoring device 101 may be configured to include another sensor that performs measurements related to the power transmission line 201, instead of the measurement CT 50 and the temperature sensor 80.

[0104] Furthermore, although the inspection method for the power transmission line monitoring device 101 according to the embodiment of the present disclosure has been described as including a step in which the user cuts the covered wire 318 to remove the covered wire 318 from the core member 41, this is not limited to this. The inspection method for the power transmission line monitoring device 101 may not include a step in which the user cuts the covered wire 318 to remove the covered wire 318 from the core member 41, but may include a step in which the covered wire 318 is removed from the driving jig 301. In other words, after inspection by the power transmission line monitoring device 101, operation of the power transmission line monitoring device 101 may be started in a state in which the covered wire 318 remains wound around the core member 41, without removing the covered wire 318 from the core member 41.

[0105] The above-described embodiments should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0106] Each process (each function) in the above-described embodiments is realized by a processing circuit including one or more processors. The processing circuit may be configured as an integrated circuit or the like that combines one or more memories, various analog circuits, and various digital circuits in addition to the one or more processors. The one or more memories store programs (instructions) that cause the one or more processors to execute each of the processes. The one or more processors may execute each of the processes according to the program read from the one or more memories, or according to a logic circuit pre-designed to execute each of the processes. The processor may be various processors suitable for computer control, such as a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processor (DSP), a field programmable gate array (FPGA), and an application-specific integrated circuit (ASIC). Note that the physically separate processors may cooperate with each other to execute each of the processes. For example, the processors mounted on a plurality of physically separated computers may cooperate with each other to execute the above processes via a network such as a LAN (Local Area Network), a WAN (Wide Area Network), the Internet, etc. The program may be installed into the memory from an external server device or the like via the network, or may be distributed in a state stored on a recording medium such as a CD-ROM (Compact Disc Read Only Memory), a DVD-ROM (Digital Versatile Disc Read Only Memory), or a semiconductor memory, and installed into the memory from the recording medium.

[0107] The above description includes the following additional features. [Appendix 1] A power transmission line monitoring device equipped with a power generation CT including an annular core member for surrounding a power transmission line, a space is formed between the power transmission line and the core member in a state in which the power transmission line monitoring device is attached to the power transmission line, allowing a covered wire to be wound around the core member along an extension direction of the power transmission line; The power transmission line monitoring device, wherein the power transmission line is an overhead transmission line. [Explanation of symbols]

[0108] 10 through holes 11. Housing 11A Lower housing 11B Upper housing 12 Gripping part 12A Lower Clamp 12B Upper clamp 13 Hinge part 14A, 14B fastening part 15 Through hole (space) 16 holes 17 Gap (space) 21A Lower inner cylinder 21B Upper inner cylinder 22A Lower outer cylinder 22B Upper outer cylinder 23A, 24A Lower lid part 23B,24B Upper lid part 31A Lower storage section 31B Upper storage section 40 Power generating current transformer 41,51 Core member 41A Lower core member 41B Upper core member 42 Coil 50 Measurement CT (measurement section) 51A Lower core member 51B Upper core member 52 Coil 60 AC / DC conversion unit 70 Communications Department 80 Temperature sensor (measurement part) 90 Antenna 101,201,301 Power line monitoring equipment 201 Power Lines 301 Drive jig 310 Power supply section 311 Battery 312 DC / AC conversion unit 313 Trans 314 Switch 315 Fuse 316 Load 317 Winding section 318 Covered Wire 318A First End 318B Second end

Claims

1. A power transmission line monitoring device including a power generating CT including an annular core member for surrounding a power transmission line, a space is formed between the power transmission line and the core member in a state in which the power transmission line monitoring device is attached to the power transmission line, allowing a covered wire to be wound around the core member along an extension direction of the power transmission line; The power transmission line monitoring device further comprises: The housing and A gripping portion; a core member fixing portion; the housing includes a first cylindrical member provided inside the core member to surround the power transmission line, and a second cylindrical member provided outside the first cylindrical member to surround the core member, the space is formed between the power transmission line and the first cylindrical member, The core member can be divided into a plurality of parts, the housing includes a first housing portion in which a part of the divided core member is provided, and a second housing portion in which another part of the divided core member is provided, the gripping portion is capable of fixing the power transmission line monitoring device to the power transmission line by gripping the power transmission line with the core member separated, The power transmission line monitoring device, wherein the core member fixing portion is capable of fixing the first housing portion and the second housing portion together with the core member being integrated.

2. A power transmission line monitoring device including a power generating CT including an annular core member for surrounding a power transmission line, a covered wire wound around the core member and supplied with AC current from outside the power transmission line monitoring device when the power transmission line monitoring device is attached to the power transmission line, the covered wire being used to cause the power generating CT to generate power; The power transmission line monitoring device further comprises: a measurement CT for performing measurements on the power transmission line; Electrical components and a housing; The power-generating CT supplies the generated power to the electrical components, the power generation CT, the measurement CT, and the electrical components are provided inside the housing; The covered wire is wound around the core member inside the housing, and an end of the covered wire is exposed to the outside of the housing.

3. A power transmission line monitoring device equipped with a power generating CT including an annular core member for surrounding a power transmission line, a space is formed between the power transmission line and the core member in a state in which the power transmission line monitoring device is attached to the power transmission line, allowing a covered wire to be wound around the core member along an extension direction of the power transmission line; The power transmission line monitoring device further includes a housing, the housing includes a first cylindrical member provided inside the core member to surround the power transmission line, and a second cylindrical member provided outside the first cylindrical member to surround the core member, a through-hole, which is the space, is formed between the core member and the first cylindrical member in the housing.

4. 1. A method for inspecting a power transmission line monitoring device equipped with a power generation CT including an annular core member, using a driving jig including a covered wire, comprising: attaching the power transmission line monitoring device to the power transmission line with the core member separated; winding the coated wire around a portion of the divided core member; attaching the divided core members to surround the power transmission line; and supplying an AC current to the covered wire to drive the power transmission line monitoring device; When the power transmission line monitoring device is attached to the power transmission line, a space is formed between the power transmission line and the divided core member, In the step of winding the covered wire, the covered wire is passed through the space to wind the covered wire around a part of the divided core member along an extension direction of the power transmission line; The power transmission line monitoring device further comprises: The housing and A gripping portion; a core member fixing portion; the housing includes a first cylindrical member provided inside the core member to surround the power transmission line, and a second cylindrical member provided outside the first cylindrical member to surround the core member, the space is formed between the power transmission line and the first cylindrical member, In the step of attaching the power transmission line monitoring device to the power transmission line, the power transmission line monitoring device is fixed to the power transmission line with the core member separated using the gripping portion; In the step of attaching the core member so as to surround the power transmission line, the core member is attached so as to surround the power transmission line by fixing the core member in an integrated state using the core member fixing portion.

5. The inspection method further comprises: The inspection method according to claim 4 , further comprising the step of cutting the covered wire to remove the covered wire from the core member after driving the power transmission line monitoring device.

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