Electric wire physical quantity measurement device

Abstract

To inspect electric wire physical quantity measurement device stably.SOLUTION: An electric wire physical quantity measurement device comprises: a power supply current transformer part arranged so as to surround an electric wire and generating power by electromagnetic induction from magnetic field generated on the basis of current flowing on the electric wire; a current measurement current transformer part arranged so as to surround the electric wire and outputting induction voltage according to current flowing on the electric wire; a first storage part storing the power supply current transformer part; a second storage part storing the current measurement current transformer part; a first winding wound around the power supply current transformer part, and configured to be able to flow driving current for generating power in the power supply current transformer part; and a second winding wound around the current measurement current transformer part, and configured to be able to flow inspection current for inspecting the current measurement current transformer part. The first winding and the second winding are respectively stored in the first storage part and the second storage part.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an electric wire physical quantity measuring device. [Background technology]

[0002] BACKGROUND ART In order to measure physical quantities such as the temperature of an electric wire or the current flowing through the electric wire, an electric wire physical quantity measuring device is sometimes attached to the electric wire (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-58960 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present disclosure is to stably inspect a wire physical quantity measuring device. [Means for solving the problem]

[0005] According to one aspect of the present disclosure, there is provided an electric wire physical quantity measuring device comprising: a power supply current transformer unit arranged to surround an electric wire and generating electric power by electromagnetic induction from a magnetic field generated by a current flowing through the electric wire; a current measurement current transformer unit arranged to surround the electric wire and outputting an induced voltage according to the current flowing through the electric wire; a first housing unit accommodating the power supply current transformer unit; a second housing unit accommodating the current measurement current transformer unit; a first winding wound around the power supply current transformer unit and configured to be capable of passing a drive current that generates electric power through the power supply current transformer unit; and a second winding wound around the current measurement current transformer unit and configured to be capable of passing an inspection current that inspects the current measurement current transformer unit, wherein the first winding and the second winding are housed in the first housing unit and the second housing unit, respectively. [Effects of the Invention]

[0006] According to the present disclosure, it is possible to stably inspect a wire physical quantity measuring device. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic perspective view showing an electric wire physical quantity measuring device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a block diagram illustrating an electric wire physical quantity measuring device according to an embodiment of the present disclosure. [Figure 3] FIG. 3 is a cross-sectional view showing an electric wire physical quantity measuring device according to an embodiment of the present disclosure. [Figure 4] FIG. 4 is a schematic diagram showing a power supply current transformer section or a current measurement current transformer section. [Figure 5] FIG. 5 is a block diagram showing a state when the first current generator or the second current generator is connected to the electric wire physical quantity measuring device. [Figure 6] FIG. 10 is a front view showing an electric wire physical quantity measuring device according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0008] [Description of the embodiments of the present disclosure] <Insights gained by the inventor> First, the findings of the inventors will be explained.

[0009] The electric wire physical quantity measuring device has, for example, a power supply current transformer unit that generates electric power and a current measurement current transformer unit that measures current (hereinafter, the current transformer unit may be abbreviated as a "CT unit"). Each of the power supply CT unit and the current measurement CT unit has, for example, a pair of half cores that contain a magnetic material and are arranged in an annular shape to surround the electric wire. The pair of half cores are coupled to each other when the electric wire physical quantity measuring device is attached to the electric wire.

[0010] The condition of the electric wire physical quantity measuring device, including the connection state of the pair of half cores in the CT section, must be inspected not only immediately after the device is attached to the electric wire, but also several years later. As a result of the inspection, the electric wire physical quantity measuring device is calibrated as necessary.

[0011] Here, when attaching the electric wire physical quantity measuring device to the electric wire, workers cannot approach the high-voltage electric wire, so the work is performed by the workers on the electric wire with the power transmission on the wire stopped (i.e., with a power outage).

[0012] At this time, because no current flows through the electric wire, the power supply CT cannot generate power and the current measurement CT cannot measure the electric wire current. Therefore, when no current flows through the electric wire, it is not possible to inspect the initial state of the electric wire physical quantity measuring device.

[0013] Therefore, the inventors have previously wound the winding 932 on the outside of the housing 930 that houses the power supply CT section 942 and the current measurement CT section 952, as in the electric wire physical quantity measuring device 90 of the comparative example shown in Fig. 6. As a result, in the comparative example, the inspection process of the electric wire physical quantity measuring device 90 was carried out using the above-mentioned winding 932.

[0014] Specifically, a predetermined current was passed through each winding 932 to generate power using the power supply CT unit 942, and the current in the winding 932 was measured using the current measurement CT unit 952. In the results obtained from this measurement, the value of the current passed through the winding 932 was compared with the current value measured by the current measurement CT unit 952. In this way, the initial state of the electric wire physical quantity measuring device 90 of the comparative example was inspected.

[0015] However, it has been found that the above-described inspection method for the electric wire physical quantity measuring device 90 of the comparative example causes the following new problems.

[0016] (i) In the comparative example, the winding 932 was wound around the outside of the housing 930, and the winding 932 was exposed to the air. Therefore, if the winding 932 remained in this state for several years, the winding 932 could deteriorate, and the resistance of the winding 932 could increase. As a result, with the winding 932 wound around the outside of the housing 930, it became difficult to stably perform the inspection process of the electric wire physical quantity measuring device 90 several years after the electric wire was attached to the electric wire.

[0017] (ii) In the comparative example, as described above, there was concern about deterioration of winding 932 due to exposure to the atmosphere, so after the initial inspection process was completed, winding 932 was cut and removed from housing 930. At this stage, housing 930 was not opened or closed, so the power supply CT section 942 and current measurement CT section 952 to be inspected were maintained in their respective coupled states.

[0018] However, if the winding 932 is cut as described above, it is necessary to re-wind the winding 932 around the outside of the housing 930 in order to perform an inspection process of the electric wire physical quantity measuring device 90 several years later. At this time, the winding 932 cannot be wound while the housing 930 remains attached to the electric wire. Therefore, it is necessary to open the housing 930 and release the coupling state of the power supply CT 942 and the current measurement CT 952. As a result, in the inspection process several years later, when the coupling state of the power supply CT 942 and the current measurement CT 952 should be checked, the coupling state ends up being released, which could defeat one of the purposes of the inspection process.

[0019] Furthermore, when opening the housing 930, there is a risk that the packing provided at the joint between the pair of half cores in each of the power supply CT section 942 and the current measurement CT section 952 may be damaged, or that the sealing material provided around the joint surface where the pair of half cores are joined may be peeled off. Therefore, opening the housing 930 may deteriorate the sealing state of the electric wire physical quantity measuring device 90.

[0020] Because of the new problems (i) and (ii) described above, there was a need for a configuration that could stably inspect an electric wire physical quantity measuring device not only in the early stages after the device is attached to an electric wire, but also after several years have passed.

[0021] The present disclosure below is based on the above-mentioned new problem discovered by the inventors.

[0022] <Embodiments of the present disclosure> Next, embodiments of the present disclosure will be listed and described.

[0023] [1] An electric wire physical quantity measuring device according to one aspect of the present disclosure includes: a power supply current transformer unit that is disposed so as to surround the electric wire and generates electric power by electromagnetic induction from a magnetic field that is generated based on a current flowing through the electric wire; a current transformer unit for current measurement, which is arranged to surround the electric wire and outputs an induced voltage corresponding to a current flowing through the electric wire; a first housing portion that houses the power supply current transformer portion; a second housing portion that houses the current transformer portion for current measurement; a first winding wound around the power supply current transformer unit and configured to allow a drive current that generates electric power to flow through the power supply current transformer unit; a second winding wound around the current transformer for current measurement and configured to allow a test current for testing the current transformer for current measurement to flow therethrough; Equipped with The first winding and the second winding are housed in the first housing portion and the second housing portion, respectively. According to this configuration, the wire physical quantity measuring device can be stably inspected.

[0024] [2] In the electric wire physical quantity measuring device described in [1] above, the first housing portion includes a waterproof filler that is filled in an area of ​​the first housing portion excluding the power supply current transformer portion and the first winding, The second housing portion includes a waterproof filler that fills an area inside the second housing portion excluding the current transformer portion for current measurement and the second winding. According to this configuration, the states of the first winding and the second winding can be stably maintained.

[0025] [3] In the electric wire physical quantity measuring device according to [1] or [2] above, the first housing portion has a first connector that can connect a first current generator that generates the drive current to the first winding from outside the first housing portion; the first connector is provided at a portion that is disposed vertically above the electric wire when the first accommodating portion is attached to the electric wire, the second housing portion has a second connector that can connect a second current generator that generates the test current to the second winding from outside the second housing portion, The second connector is provided at a position where it is disposed vertically above the electric wire when the second accommodating portion is attached to the electric wire. According to this configuration, the inspection process can be easily and stably carried out by a worker standing on the electric wire.

[0026] [4] A wire physical quantity measuring device according to another aspect of the present disclosure includes: a power supply current transformer unit that is disposed so as to surround the electric wire and generates electric power by electromagnetic induction from a magnetic field that is generated based on a current flowing through the electric wire; a current transformer unit for current measurement, which is arranged to surround the electric wire and outputs an induced voltage corresponding to a current flowing through the electric wire; a housing section that houses both the power supply current transformer section and the current measurement current transformer section; a winding wound around both the power supply current transformer unit and the current measurement current transformer unit, configured to generate electric power in the power supply current transformer unit and to pass a driving and testing current for testing the current measurement current transformer unit; Equipped with The winding is housed in the housing. According to this configuration, the wire physical quantity measuring device can be stably inspected.

[0027] [Details of the embodiments of the present disclosure] Next, one embodiment of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0028] <One embodiment of the present disclosure> (1) Overview of the electrical wire physical quantity measuring device An outline of an electric wire physical quantity measuring device 10 according to an embodiment of the present disclosure will be described with reference to Figures 1 to 4. Figure 3 is a cross-sectional view of the electric wire physical quantity measuring device 10 taken along the direction in which an electric wire 100 is inserted, with the electric wire 100 omitted. In the figures other than Figure 2, some of the wiring is omitted.

[0029] Hereinafter, the "axial direction" of the electric wire 100 refers to the direction along the central axis of the electric wire 100, and in some cases can be rephrased as the longitudinal direction of the electric wire 100. The "radial direction" of the electric wire 100 refers to the direction from the central axis of the electric wire 100 toward the outer periphery, i.e., the direction perpendicular to the axial direction of the electric wire 100. The "circumferential direction" of the electric wire 100 refers to the direction along the outer periphery of the electric wire 100. The same terms as those mentioned above are used for cylindrical members, columnar members, cylindrical portions, columnar portions, and the like included in the electric wire physical quantity measuring device 10.

[0030] The "axial direction" of the power supply core 422 or the measurement core 522 refers to the direction along the central axis of the arc formed by the power supply core 422 or the measurement core 522.

[0031] 1 to 4 , an electric wire physical quantity measuring device 10 of this embodiment is configured to be attached to, for example, an electric wire 100 and measure the physical quantity of the electric wire 100. Specifically, the electric wire physical quantity measuring device 10 has, for example, a power supply current transformer section (power supply CT section, power generation CT section) 420, a power supply section (power supply circuit) 440, a current measurement current transformer section (current measurement CT section) 520, a current measurement section (current measurement circuit) 540, a temperature sensor section 200, a wireless section (transmitter / receiver section, communication section) 600, a first housing section 310, a second housing section 320, a clamp (holding section) 700, a first winding 332, and a second winding 342.

[0032] (Electric wire) In this embodiment, the electric wire 100 to be measured by the electric wire physical quantity measuring device 10 is configured as, for example, a so-called overhead transmission line. Specifically, the electric wire 100 is, for example, an aluminum stranded steel wire (ACSR).

[0033] (Power supply current transformer section) 2 to 4, the power supply CT unit 420 is disposed, for example, in a ring shape so as to surround the electric wire 100. The power supply CT unit 420 is configured, for example, to generate electric power by electromagnetic induction from a magnetic field generated around the electric wire 100 based on a current flowing through the electric wire 100.

[0034] 4, the power CT section 420 of this embodiment includes, for example, a power core 422 and a power coil 424. The power core 422 is arranged, for example, in a ring shape so as to surround the outer periphery of the electric wire 100. The power core 422 includes a magnetic material. The power coil 424 is wound around at least a portion of the power core 422. With this configuration, an induced current can be generated in the power coil 424 by electromagnetic induction based on a change in magnetic flux generated in the power core 422 around the electric wire 100 due to a current flowing through the electric wire 100.

[0035] The power supply core 422 of this embodiment is, for example, split in half along the axial direction of the arc formed by the power supply core 422. Here, "split in half along the axial direction" means that the power supply core 422 is split into two on a plane that includes the central axis of the arc formed by the power supply core 422 or on a plane that is parallel to the central axis. Hereinafter, the definition of "split in half along the axial direction" for other members is the same as the above definition.

[0036] For example, of a pair of power supply half cores formed by splitting the power supply core 422 in half along the axial direction, the power supply half core located vertically below is referred to as the "lower power supply half core 423d," and the power supply half core located vertically above is referred to as the "upper power supply half core 423u."

[0037] (Power supply part) 2, the power supply unit 440 is configured to be connected to the power supply CT unit 420, for example, and convert the power generated in the power supply CT unit 420 into power suitable for the radio unit 600 described below, and supply the power to the radio unit 600. Specifically, the power supply unit 440 is configured to convert the AC power generated in the power supply CT unit 420 into DC power suitable for the radio unit 600. The power supply unit 440 is configured to transform the voltage generated in the power supply CT unit 420 into a voltage suitable for the radio unit 600, for example.

[0038] (Current transformer for current measurement) 2 to 4, the current measuring CT unit 520 is arranged, for example, in a ring shape so as to surround the electric wire 100. The current measuring CT unit 520 is configured, for example, to output an induced voltage corresponding to the current flowing through the electric wire 100.

[0039] 4, the current measuring CT section 520 of this embodiment is configured in substantially the same manner as the above-described power supply CT section 420, and includes, for example, a measuring core 522 and a measuring coil 524. With this configuration, an induced voltage can be generated in the measuring coil 524 by electromagnetic induction based on a change in magnetic flux generated in the measuring core 522 around the electric wire 100 by a current flowing through the electric wire 100.

[0040] The measurement core 522 of this embodiment is, for example, split in half along the axial direction of the arc formed by the measurement core 522, similar to the power supply core 422. For example, of the pair of measurement half cores obtained by splitting the measurement core 522 in half along the axial direction, the measurement half core arranged vertically lower is referred to as the "lower measurement half core 523d," and the measurement half core arranged vertically upper is referred to as the "upper measurement half core 523u."

[0041] (Current measurement section) 2, the current measuring unit 540 is configured to be connected to the current measuring CT unit 520, for example, and to measure the current flowing through the electric wire 100 based on the induced voltage output by the current measuring CT unit 520. Hereinafter, information related to the current of the electric wire 100 measured by the current measuring unit 540 will be referred to as "current data."

[0042] (Temperature sensor part) 1 and 2, the temperature sensor unit 200 is configured to be in contact with the electric wire 100 and measure the temperature of the electric wire 100. Specifically, the temperature sensor unit 200 has, for example, a thermocouple that outputs a voltage according to the temperature. Hereinafter, information related to the temperature of the electric wire 100 measured by the temperature sensor unit 200 will be referred to as "temperature data."

[0043] The temperature sensor section 200 is connected to a wireless section 600 (described later) via a lead wire 280, for example.

[0044] (Radio Department) The wireless unit 600 is configured to, for example, communicate predetermined information. In this embodiment, the wireless unit 600 is configured to, for example, wirelessly transmit information related to a physical quantity of the electric wire 100, such as a current in the electric wire 100, to the outside.

[0045] 2, the wireless unit 600 is connected to the current measurement CT unit 520 via the current measurement unit 540, for example, and is configured to acquire current data of the electric wire 100 measured based on the induced voltage output by the current measurement CT unit 520. The wireless unit 600 is connected to the temperature sensor unit 200, for example, and is configured to acquire temperature data of the electric wire 100 measured by the temperature sensor unit 200. The wireless unit 600 is connected to the power supply CT unit 420 via the power supply unit 440, for example, and is configured to wirelessly transmit various data including temperature data, current data, etc. to the outside using power supplied from the power supply unit 440.

[0046] As shown in FIGS. 1 to 3, the wireless unit 600 has, for example, an antenna 620, and is configured to transmit and receive various data to and from the outside via the antenna 620.

[0047] (First storage section) 1 to 3, the first accommodating section 310 accommodates, for example, at least the power supply CT section 420 outside the electric wire 100. In this embodiment, the first accommodating section 310 accommodates, for example, not only the power supply CT section 420 but also the power supply section 440, the current measuring section 540, and the wireless section 600 outside the electric wire 100.

[0048] (Second storage section) As shown in FIGS. 1 to 3, the second housing portion 320 houses, for example, a current measuring CT portion 520 outside the electric wire 100.

[0049] At least a part of the first storage section 310 and at least a part of the second storage section 320 are separated from each other and configured to be able to be opened and closed individually.

[0050] (clamp) The clamp 700 is connected to, for example, at least one of the first accommodating portion 310 and the second accommodating portion 320 and grips the electric wire 100. In the present embodiment, the clamp 700 is provided, for example, between the first accommodating portion 310 and the second accommodating portion 320 and connected to both the first accommodating portion 310 and the second accommodating portion 320. The clamp 700 contains, for example, aluminum (Al) or an Al alloy. The clamp 700 having such a configuration can fix the first accommodating portion 310 and the second accommodating portion 320 to the electric wire 100.

[0051] (1st and 2nd windings) The first winding 332 and the second winding 342 are configured to pass a current for inspecting the electric wire physical quantity measuring device 10. Specifically, the first winding 332 is wound around the power supply CT unit 420, for example, and is configured to be able to pass a drive current that generates power in the power supply CT unit 420. The second winding 342 is wound around the current measurement CT unit 520, for example, and is configured to be able to pass a test current that inspects the current measurement CT unit 520. The arrangement and other aspects of the first winding 332 and the second winding 342 will be described in detail below.

[0052] (2) Aspects of the First Winding, the Second Winding, the First Housing, and the Second Housing 1 to 4, aspects of the first winding 332, the second winding 342, the first housing portion 310, and the second housing portion 320 of this embodiment will be described in detail.

[0053] (1st winding) 3 and 4, in this embodiment, the first winding 332 is housed, for example, in the first housing section 310. The first winding 332 is wound around the power supply core 422 of the power supply CT section 420, for example, in the first housing section 310. By arranging the first winding 332 in this manner, deterioration of the first winding 332 can be suppressed.

[0054] The first winding 332 is made of, for example, a metal wire. Examples of the metal contained in the first winding 332 include copper.

[0055] The first winding 332 is wound, for example, multiple times around the power supply core 422 of the power supply CT unit 420. The number of turns of the first winding 332 around the power supply core 422 is set, for example, so that the power supply CT unit 420 can obtain power for driving the electric wire physical quantity measuring device 10 from a driving current that is the sum of currents flowing through the multiple first windings 332 inside the power supply core 422 (at a position close to the central axis of the power supply core 422).

[0056] Specifically, when the current flowing from the first current generator 810 (described later) to one first winding 332 is 2 A, the number of turns of the first winding 332 around the power supply core 422 is set to, for example, 30. This allows the total drive current flowing through the multiple first windings 332 inside the power supply core 422 to be 60 A. As a result, the power supply CT unit 420 can obtain sufficient power to drive the electric-wire physical quantity measuring device 10.

[0057] The first winding 332 is arranged, for example, along at least a portion of the inner wall of the first housing portion 310. This makes it possible to stabilize the position of the first winding 332 within the first housing portion 310.

[0058] (2nd winding) 3 and 4, in this embodiment, the second winding 342 is housed, for example, in the second housing portion 320. The second winding 342 is wound around the measurement core 522 of the current measurement CT portion 520 in the second housing portion 320. By arranging the second winding 342 in this manner, deterioration of the second winding 342 can be suppressed.

[0059] The second winding 342 is made of, for example, the same metal wire as the first winding 332 .

[0060] The second winding 342 is wound, for example, multiple times around the measurement core 522 of the current measurement CT unit 520. The number of turns of the second winding 342 around the measurement core 522 is set, for example, so that the current measurement CT unit 520 measures an inspection current equal to the drive current flowing through the first winding 332. In this embodiment, the number of turns of the second winding 342 around the measurement core 522 is equal to the number of turns of the first winding 332 around the power supply core 422, for example.

[0061] The second winding 342 is arranged, for example, along at least a portion of the inner wall of the second housing portion 320. This makes it possible to stabilize the position of the second winding 342 within the second housing portion 320.

[0062] (First storage section) As shown in FIG. 3, first housing section 310 houses power supply CT section 420, power supply section 440, current measuring section 540, radio section 600 and first winding 332 outside electric wire 100.

[0063] The first housing portion 310 is made of, for example, a metal that does not contain a magnetic material. Specifically, the first housing portion 310 of this embodiment contains, for example, Al or an Al alloy.

[0064] In this embodiment, the first accommodating section 310 is, for example, split in half along the axial direction. Of the pair of first accommodating sections 310 obtained by splitting the first accommodating section 310 in half along the axial direction, the first accommodating section disposed on the vertically lower side is referred to as the "first lower accommodating section 316," and the first accommodating section disposed on the vertically upper side is referred to as the "first upper accommodating section 318."

[0065] As shown in FIG. 3, the first lower accommodating section 316 and the first upper accommodating section 318 accommodate, for example, a lower power supply half core 423d and an upper power supply half core 423u, respectively. The first upper accommodating section 318 is configured to be openable and closable relative to the first lower accommodating section 316. The first lower accommodating section 316 and the first upper accommodating section 318 are arranged to face each other across the electric wire 100. Inside the first lower accommodating section 316 and the first upper accommodating section 318, which are arranged to face each other, the lower power supply half core 423d and the upper power supply half core 423u are joined together with their cross sections (joint surfaces) aligned. A packing (not shown) may be provided at the joint between the lower power supply half core 423d and the upper power supply half core 423u. Furthermore, a sealing material (not shown) may be provided (or applied) around the periphery of the joining surface where the power supply lower half core 423d and the power supply upper half core 423u are joined together.

[0066] As shown in FIGS. 1 and 3 , the first housing 310 of this embodiment has, for example, a double-cylinder structure. Specifically, the first housing 310 has, for example, a first inner cylinder 312, a first outer cylinder 314, and a first lid 315. The electric wire 100 is inserted into the first inner cylinder 312 at a radial distance from the inner circumferential surface of the first inner cylinder 312. The first outer cylinder 314 is provided to surround the outer periphery of the first inner cylinder 312 and forms a first housing space (reference numeral not shown) between the first outer cylinder 314 and the first inner cylinder 312. The first lid 315 is provided (welded) to each of both axial ends of the first outer cylinder 314 and closes the first housing space. Since the first housing 310 has such a double-cylinder structure, it is possible to prevent rainwater from entering the first housing 310.

[0067] In this embodiment, the first housing portion 310 includes, for example, a waterproof filler (reference numeral not shown). The filler fills, for example, an area of ​​the first housing portion 310 excluding the power supply CT portion 420, the power supply portion 440, the current measurement portion 540, the wireless portion 600, and the first winding 332. The filler is, for example, hardened. An example of the filler is two-component hardening silicone rubber. This improves the waterproofness of the inside of the first housing portion 310 and enables the components inside the first housing portion 310 to be fixed in place.

[0068] In this embodiment, the first accommodating section 310 has, for example, a first connector 334. The first connector 334 is configured so that, for example, a first current generator 810 that generates a drive current (described later) can be connected to the first winding 332 from outside the first accommodating section 310. The first connector 334 has, for example, a first terminal (reference number not shown) connected to a first end of the first winding 332 and a second terminal (reference number not shown) connected to a second end of the first winding 332 opposite the first end.

[0069] In this embodiment, the first connector 334 is provided, for example, at a portion that is positioned vertically above the electric wire 100 when the first accommodating section 310 is attached to the electric wire 100. Specifically, the first connector 334 is provided, for example, at an upper portion of the first lid section 315 of the first accommodating section 310. This allows a worker standing on the electric wire 100 to easily connect a first current generator 810 that generates a drive current (described later) to the first connector 334.

[0070] (Second storage section) As shown in FIG. 3, the second housing portion 320 houses the current measuring CT portion 520 described above outside the electric wire 100.

[0071] The second housing portion 320 is made of, for example, the same metal as the first housing portion 310.

[0072] In this embodiment, the second accommodating section 320 is, for example, split in half along the axial direction. Of the pair of second accommodating sections obtained by splitting the second accommodating section 320 in half along the axial direction, the second accommodating section disposed on the vertically lower side is referred to as the "second lower accommodating section 326," and the second accommodating section disposed on the vertically upper side is referred to as the "second upper accommodating section 328."

[0073] As shown in FIGS. 1 and 3, the second lower accommodating section 326 and the second upper accommodating section 328 accommodate, for example, a lower measurement half core 523d ​​and an upper measurement half core 523u, respectively. The second upper accommodating section 328 is configured to be openable and closable relative to the second lower accommodating section 326. The second lower accommodating section 326 and the second upper accommodating section 328 are arranged to face each other across the electric wire 100. Inside the second lower accommodating section 326 and the second upper accommodating section 328, which are arranged to face each other, the lower measurement half core 523d ​​and the upper measurement half core 523u are joined together with their cross sections (joining surfaces) aligned. A packing (not shown) may be provided at the joint between the lower measurement half core 523d ​​and the upper measurement half core 523u. Furthermore, a sealant (not shown) may be provided (or applied) around the periphery of the joining surface where the lower half core for measurement 523d ​​and the upper half core for measurement 523u are joined together.

[0074] 1 and 3, second storage section 320 of this embodiment has a double-cylinder structure similar to first storage section 310, except that, for example, second storage section 320 differs from first storage section 310 in size, storage members, etc. Specifically, second storage section 320 has, for example, second inner cylinder 322, second outer cylinder 324, and second lid section 325. With this configuration, it is possible to prevent rainwater from entering second storage section 320.

[0075] In this embodiment, the second housing section 320 includes, for example, a waterproof filler (reference numeral not shown), similar to the first housing section 310. The filler fills, for example, an area of ​​the second housing section 320 excluding the current measurement CT section 520 and the second winding 342. The filler is, for example, hardened. The filler of the second housing section 320 is, for example, made of the same material as the filler of the first housing section 310. This improves the waterproofness of the interior of the second housing section 320 and enables the components inside the second housing section 320 to be fixed in place.

[0076] In this embodiment, the second accommodating section 320 has, for example, a second connector 344. The second connector 344 is configured so that, for example, a second current generator 820 that generates a test current (described later) can be connected to the second winding 342 from outside the second accommodating section 320. The second connector 344 has, for example, a first terminal (reference number not shown) connected to a first end of the second winding 342 and a second terminal (reference number not shown) connected to a second end of the second winding 342 opposite to the first end.

[0077] In the present embodiment, the second connector 344 is provided, for example, in a portion that is positioned vertically above the electric wire 100 when the second accommodating section 320 is attached to the electric wire 100. Specifically, the second connector 344 is provided, for example, on an upper portion of the second lid section 325 of the second accommodating section 320. This allows a worker standing on the electric wire 100 to easily connect a second current generator 820 that generates an inspection current, which will be described later, to the second connector 344.

[0078] (3) Inspection method for electrical wire physical quantity measuring device An inspection method for the electric wire physical quantity measuring device 10 of this embodiment will be described with reference to FIGS.

[0079] The inspection method of the electric wire physical quantity measuring device 10 of this embodiment includes, for example, a preparation step S10 and an inspection step S20.

[0080] (S10: Preparation process) First, the electric wire physical quantity measuring device 10 of this embodiment is prepared. As described above, the first winding 332 and the second winding 342 are housed in advance in the first housing section 310 and the second housing section 320 of the electric wire physical quantity measuring device 10, respectively.

[0081] With the power transmission through the electric wire 100 stopped, an operator works on the electric wire 100 to attach the electric wire physical quantity measuring device 10 to the electric wire 100 .

[0082] (S20: Inspection process) After the preparation step S10 is completed, the inspection step S20 is performed. The inspection step S20 of this embodiment includes, for example, an initial inspection step S22 and an inspection step S24 several years later.

[0083] (S22: Initial inspection process) After the above-described electric wire physical quantity measuring device 10 is attached, an initial inspection step S22 is performed in a state where power transmission through the electric wire 100 is stopped.

[0084] 5, a first current generator 810 that generates a predetermined drive current is prepared. The first current generator 810 includes, for example, a first battery 812 and a first DC / AC converter 814. The first battery 812 is configured to supply, for example, 12 V DC power. The first DC / AC converter 814 is configured to convert, for example, DC power from the first battery 812 into AC power having a commercial frequency.

[0085] Furthermore, a second current generator 820 that generates a predetermined test current is prepared. The second current generator 820 is configured, for example, similarly to the first current generator 810, and includes a second battery 822 and a second DC / AC converter 824.

[0086] The above-described first current generator 810 may also serve as the second current generator 820 .

[0087] After the first current generator 810 and the second current generator 820 are prepared, the first current generator 810 is connected to the first winding 332 from outside the first accommodating portion 310 via the first connector 334, as shown in Fig. 5. Furthermore, the second current generator 820 is connected to the second winding 342 from outside the second accommodating portion 320 via the second connector 344.

[0088] After the first current generator 810 and the second current generator 820 are connected, a drive current is passed from the first current generator 810 to the first winding 332, thereby generating electric power in the power supply CT section 420. The electric wire physical quantity measuring device 10 is driven by the electric power thus obtained.

[0089] At this time, a test current is passed from second current generator 820 to second winding 342, and the test current is measured based on the induced voltage output from current measuring CT section 520. This allows the test current value actually passed from second current generator 820 to second winding 342 to be compared with the test current value measured by current measuring CT section 520.

[0090] If the actually applied inspection current value is equal to the measured inspection current value, it is determined that the attachment state of the electric wire physical quantity measuring device 10 to the electric wire 100 is good. In this case, the electric wire physical quantity measuring device 10 is not calibrated.

[0091] If the actually applied test current value differs from the measured test current value, the wire physical quantity measuring device 10 is calibrated by calculating a correction coefficient so that the measured test current value becomes the true value.

[0092] If the two inspection current values ​​are too different from each other, or if the electric wire physical quantity measuring device 10 does not operate stably, it is determined that the attachment state of the electric wire physical quantity measuring device 10 to the electric wire 100 (such as the respective coupling states of the power supply CT unit 420 and the current measurement CT unit 520) is poor. In this case, the electric wire physical quantity measuring device 10 is reattached to the electric wire 100.

[0093] When the above initial inspection step S22 is completed, the first current generator 810 and the second current generator 820 are removed from the electric wire physical quantity measuring device 10. At this time, the first winding 332 and the second winding 342 are maintained in a state of being housed in the first housing portion 310 and the second housing portion 320, respectively. Thereafter, power transmission through the electric wire 100 is resumed, and measurement by the electric wire physical quantity measuring device 10 is started.

[0094] (S24: Inspection process after several years) Several years after the above-described electric wire physical quantity measuring device 10 is installed, an inspection step S24 is performed with power transmission to the electric wire 100 stopped. The inspection step S24 after several years is performed after the preparation step S10 without removing the electric wire physical quantity measuring device 10 from the electric wire 100 (without opening the first housing portion 310 and the second housing portion 320). The inspection step S24 after several years is similar to the initial inspection step S22 except that it is performed at a different time.

[0095] (4) Summary of this embodiment According to this embodiment, one or more of the following effects are achieved.

[0096] (a) In this embodiment, the first winding 332 and the second winding 342, through which a current for inspecting the electric wire physical quantity measuring device 10 flows, are housed in the first housing portion 310 and the second housing portion 320, respectively.

[0097] This allows the first winding 332 and the second winding 342 to be stably stored in the first housing portion 310 and the second housing portion 320, respectively, without being exposed to the atmosphere outside the first housing portion 310 and the second housing portion 320. This makes it possible to suppress deterioration of the first winding 332 and the second winding 342. In other words, it is possible to prevent the resistance of the first winding 332 and the second winding 342 from becoming excessively high even several years after the electric wire physical quantity measuring device 10 is installed. In this way, the state of the first winding 332 and the second winding 342 can be stably maintained.

[0098] Furthermore, the first winding 332 and the second winding 342 can be maintained in the first housing portion 310 and the second housing portion 320, respectively, in a state in which the inspection step S20 can be performed at any time (a wiring state in which a current can be applied). By maintaining the first winding 332 and the second winding 342 in the above-described state, the first housing portion 310 and the second housing portion 320 do not need to be reopened for the inspection step S20, and the power supply CT unit 420 and the current measurement CT unit 520 do not need to be uncoupled. This makes it possible to appropriately inspect the state of the electric wire physical quantity measuring device 10, including the power supply CT unit 420 and the current measurement CT unit 520, for example, to determine whether or not the power supply CT unit 420 and the current measurement CT unit 520 have deviated from their initial coupled state.

[0099] As described above, according to this embodiment, it is possible to stably inspect the electric wire physical quantity measuring device 10 not only in the early stages after the electric wire physical quantity measuring device 10 is attached to the electric wire 100, but also after several years have passed.

[0100] (b) In this embodiment, first housing section 310 contains a waterproof filler that fills the area inside first housing section 310 excluding power supply CT section 420, power supply section 440, current measurement section 540, radio section 600, and first winding 332. Second housing section 320 contains a waterproof filler that fills the area inside second housing section 320 excluding current measurement CT section 520 and second winding 342.

[0101] By covering the first winding 332 and the second winding 342 with a waterproof filler in the first housing portion 310 and the second housing portion 320, respectively, it is possible to prevent water from entering and moisture from passing through the first winding 332 and the second winding 342 in the first housing portion 310 and the second housing portion 320. This makes it possible to stably prevent deterioration of the first winding 332 and the second winding 342.

[0102] Furthermore, by filling the areas of the first storage section 310 and the second storage section 320, respectively, with filler, excluding the first winding 332 and the second winding 342, the positions of the first winding 332 and the second winding 342 within the first storage section 310 and the second storage section 320 can be stably fixed.

[0103] In this way, the states of the first winding 332 and the second winding 342 can be maintained stably.

[0104] (c) In this embodiment, the first connector 334 connectable to the first winding 332 is provided in a portion that is positioned vertically above the electric wire 100 when the first accommodating portion 310 is attached to the electric wire 100. The second connector 344 connectable to the second winding 342 is provided in a portion that is positioned vertically above the electric wire 100 when the second accommodating portion 320 is attached to the electric wire 100.

[0105] This allows a worker standing on the electric wire 100 to easily connect the first current generator 810 that generates a drive current and the second current generator 820 that generates an inspection current to the first connector 334 and the second connector 344, respectively. As a result, the inspection process S20 can be easily and stably performed on the electric wire 100.

[0106] <Other Embodiments of the Present Disclosure> Although the embodiments of the present disclosure have been specifically described above, the present disclosure is not limited to the above-described embodiments and can be modified in various ways without departing from the spirit of the present disclosure.

[0107] In the above embodiment, a case has been described in which the electric wire physical quantity measuring device 10 is configured to measure the current flowing through the electric wire 100 and the temperature of the electric wire 100 as physical quantities of the electric wire 100, but the present disclosure is not limited to this case. The electric wire physical quantity measuring device 10 may be configured to measure other physical quantities in addition to the current flowing through the electric wire 100 and the temperature of the electric wire 100. Examples of other physical quantities include vibration of the electric wire 100 and sag of the electric wire 100.

[0108] In the above-described embodiment, the electric wire physical quantity measuring device 10 has the first housing portion 310, the second housing portion 320, the first winding 332, and the second winding 342, and the first winding 332 and the second winding 342 are respectively housed in the first housing portion 310 and the second housing portion 320. However, the present disclosure is not limited to this case. A modified electric wire physical quantity measuring device 10 may have the following configuration.

[0109] Specifically, in the electric wire physical quantity measuring device 10 of the modified example, one housing accommodates both the power supply CT section 420 and the current measurement CT section 520. For example, one winding is provided. For example, the winding is wound around both the power supply CT section 420 and the current measurement CT section 520, and is configured to generate power in the power supply CT section 420 and to pass a driving and testing current that tests the current measurement CT section 520. The winding is housed in the housing described above. Even with the configuration of the modified example, the same effects as those of the above-described embodiment can be obtained. Furthermore, according to the modified example, the configuration related to the winding can be simplified compared to the above-described embodiment.

[0110] <Additional Notes> The following additionally describes aspects of the present disclosure.

[0111] [5] A step of preparing an electric wire physical quantity measuring device for measuring a physical quantity of an electric wire; inspecting the electric wire physical quantity measuring device; Equipped with In the step of preparing the electric wire physical quantity measuring device, As the electric wire physical quantity measuring device, a power supply current transformer unit that is disposed so as to surround the electric wire and generates electric power by electromagnetic induction from a magnetic field generated based on a current flowing through the electric wire; a current transformer unit for current measurement, which is arranged to surround the electric wire and outputs an induced voltage corresponding to a current flowing through the electric wire; a first housing portion that houses the power supply current transformer portion; a second housing portion that houses the current transformer portion for current measurement; a first winding wound around the power supply current transformer; a second winding wound around the current transformer for current measurement; Equipped with providing a device in which the first winding and the second winding are housed in the first housing and the second housing, respectively; The step of inspecting the electric wire physical quantity measuring device includes: a step of causing a drive current to flow through the first winding to generate electric power in the power supply current transformer unit; a step of passing a test current through the second winding and measuring the test current based on an induced voltage output from the current transformer for current measurement; have Inspection method for electrical wire physical quantity measuring device.

[0112] [6] The step of inspecting the electric wire physical quantity measuring device is carried out after the step of preparing the electric wire physical quantity measuring device without removing the electric wire physical quantity measuring device from the electric wire. [5] An inspection method for an electric wire physical quantity measuring device according to the present invention. [Explanation of symbols]

[0113] 10 Wire physical quantity measuring device 90 Wire physical quantity measuring device 100 wire 200 Temperature sensor section 280 lead wire 310 First Storage Unit 312 First inner cylinder 314 First outer cylinder 315 1st lid part 316 First lower storage compartment 318 First upper storage compartment 320 Second Storage Unit 322 Second inner cylinder 324 Second outer cylinder 325 2nd lid part 326 Second Lower Storage Unit 328 Second upper storage compartment 332 Winding No. 1 334 First Connector 342 Second Winding 344 Second Connector 420 Power supply CT section 422 Power Core 423d Lower half core for power supply 423u Upper half core for power supply 424 Power supply coil 440 Power supply section 520 CT section for current measurement 522 Measurement Core 523d Lower half core for measurement 523u Upper half core for measurement 524 Measuring Coil 540 Current measurement section 600 Radio Department 620 Antenna 700 Clamp 810 First Current Generator 812 First Battery 814 1st DC / AC converter 820 Second Current Generator 822 Second Battery 824 Second DC / AC converter 930 Storage unit 932 Winding 942 Power supply CT section 952 CT section for current measurement

Claims

1. a power supply current transformer unit that is disposed so as to surround the electric wire and generates electric power by electromagnetic induction from a magnetic field that is generated based on a current flowing through the electric wire; a current transformer unit for current measurement, which is arranged to surround the electric wire and outputs an induced voltage corresponding to a current flowing through the electric wire; a first housing portion that houses the power supply current transformer portion; a second housing portion that houses the current transformer portion for current measurement; a first winding wound around the power supply current transformer unit and configured to allow a drive current to flow through the power supply current transformer unit, the drive current generating electric power; a second winding wound around the current transformer unit for current measurement and configured to allow a test current for testing the current transformer unit for current measurement to flow therethrough; Equipped with The first winding and the second winding are housed in the first housing portion and the second housing portion, respectively. Wire physical quantity measuring device.

2. the first housing portion includes a waterproof filler filled in an area of ​​the first housing portion excluding the power supply current transformer portion and the first winding, The second housing portion includes a waterproof filler filled in an area of ​​the second housing portion excluding the current transformer portion for current measurement and the second winding. The electrical wire physical quantity measuring device according to claim 1 .

3. the first housing portion has a first connector that can connect a first current generator that generates the drive current to the first winding from outside the first housing portion; the first connector is provided at a portion that is disposed vertically above the electric wire when the first accommodating portion is attached to the electric wire, the second housing portion has a second connector that can connect a second current generator that generates the inspection current to the second winding from outside the second housing portion, The second connector is provided at a position where it is disposed vertically above the electric wire when the second housing portion is attached to the electric wire. The electrical wire physical quantity measuring device according to claim 1 or 2.

4. a power supply current transformer unit that is disposed so as to surround the electric wire and generates electric power by electromagnetic induction from a magnetic field that is generated based on a current flowing through the electric wire; a current transformer unit for current measurement, which is arranged to surround the electric wire and outputs an induced voltage corresponding to a current flowing through the electric wire; a housing section that houses both the power supply current transformer section and the current measurement current transformer section; a winding wound around both the power supply current transformer unit and the current measurement current transformer unit, configured to generate electric power in the power supply current transformer unit and to pass a driving and testing current for testing the current measurement current transformer unit; Equipped with The winding is housed in the housing. Wire physical quantity measuring device.

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