Coil material, current sensor measurement machine, and coil mounting system

Abstract

To implement "reduction of electrical influences", etc., from a desired cable run by grounding a conductive shield part which is at least provided on an inner peripheral side of a substantially circular core winding.SOLUTION: In a substantially circular coil part 2 of a coil material 1 which is mounted to a predetermined cable run S, a conductive shield part 3 is provided on an inner peripheral side of a substantially circular core 2a and a winding 2b, and the shield part 3 is grounded. An encapsulation part 4 in which the substantially circular coil part 2 is encapsulated by a synthetic resin or a cushion part 5 may also be included. Regarding a current sensor measurement machine 10 including a current sensor portion 11 provided with the coil material 1 and a measurement portion 12, a rating range of its measurement current is from 1 A or more to 1,800 A or less or a coil may not be included other than the coil material 1. In a coil mounting system 50, the coil material 1 in which the shield parts 3 are provided on both an inner peripheral side and an outer peripheral side of the substantially circular coil part 2 is mounted in two lines in conductors of three lines which are predetermined cable runs S disposed in parallel.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a coil material that is attached to a predetermined electrical path, a current sensor measuring instrument that uses the coil material, and an attachment system for the coil material. [Background technology]

[0002] BACKGROUND ART Current transformers are known in the art (see Patent Document 1). This current transformer has an iron core that derives magnetic flux from a primary conductor, a secondary coil that converts the magnetic flux into a secondary current, an insulating body that covers the iron core and secondary coil, a secondary terminal that penetrates a part of the insulating body and connects to the secondary coil, an exposed secondary terminal portion that is an end of the secondary terminal and is exposed from the insulating body, and a gap between a grounding metal attached to the insulating body and the exposed secondary terminal portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-344620 Summary of the Invention [Problem to be solved by the invention]

[0004] However, as shown in claim 2 and Figure 2, the current transformer described in Patent Document 1 has a problem in that although the secondary coil is grounded via the exposed part of the secondary terminal or a grounding fitting, it is subject to electrical influences such as electrostatic induction and electromagnetic induction from the primary conductor.

[0005] In view of these points, the present invention aims to provide a coil material, a current sensor measuring device, and a coil mounting system that achieves "reduction of electrical influence" from a specified electrical path by grounding at least a conductive shield portion provided on the inner periphery of a substantially circular core winding. [Means for solving the problem]

[0006] The coil material 1 according to the present invention is a coil material to be attached to a predetermined electrical circuit, and has a substantially circular coil portion 2, the substantially circular coil portion 2 having a substantially circular core 2a and a winding 2b wound around the core 2a, and has a first feature in that at least a conductive shield portion 3 is provided on the inner circumferential side of the wound winding 2b, and the shield portion 3 is grounded.

[0007] The second feature of the coil material 1 of the present invention is that, in addition to the first feature, it has an encapsulation portion 4 in which the approximately circular coil portion 2 is encapsulated with synthetic resin, and a cushion portion 5 is provided between the encapsulation portion 4 and the approximately circular coil portion 2 and / or inside the approximately circular coil portion 2.

[0008] The current sensor measuring device 10 of the present invention is a current sensor measuring device having the above-mentioned coil material 1 and a current sensor portion 11 that outputs a sensor current corresponding to the current in the specified electrical circuit, and a measuring portion 12 that measures the current in the specified electrical circuit based on the sensor current output from the current sensor portion 11, and has a first feature in that the rated range of the current measured by the current sensor measuring device is 1 A or more and 1800 A or less.

[0009] A second feature of the current sensor measuring device 10 according to the present invention is that, in addition to the first feature, the current sensor measuring device does not have any coil other than the coil material 1.

[0010] The coil mounting system 50 of the present invention is a coil mounting system including the above-mentioned coil material 1, and has a first feature in that the specified electrical circuit is a three-wire conductor arranged in parallel, the approximately circular coil portion 2 of the coil material 1 has the shield portion 3 provided not only on the inner side of the wound winding 2b but also on the outer side of the wound winding 2b, and the coil material 1 is mounted so that at least two of the three conductors pass through the approximately circular coil portion 2 of the coil material 1.

[0011] Due to these features, by grounding the conductive shield portion 3 provided on the inner periphery of the approximately circular core 2a and winding 2b, unlike Patent Document 1, it is possible to reduce electrical influences such as electrostatic induction and electromagnetic induction from a specified electrical circuit S (such as the main electrical circuit described below) to which the coil material 1 is attached ("reduction of electrical influences"). As a result, it can be said that measurement errors in a current sensor measuring device 10 (described later) using the coil material 1 can be reduced ("reduction of measurement errors").

[0012] Furthermore, by providing an encapsulation section 4 in which the approximately circular coil section 2 is encapsulated with synthetic resin, and cushion sections 5 between the encapsulation section 4 and the approximately circular coil section 2 and inside the approximately circular coil section 2, the durability of the coil material 1 can be improved, and at the same time, as shown in Figure 3, etc., even if the encapsulation section 4 and cushion sections 5 are provided, the measurement accuracy of a current sensor measuring device 10 using the coil material 1 is not affected, and the accuracy can be maintained (achieving both "improved durability" and "maintained measurement accuracy").

[0013] Furthermore, by setting the rated range of the measurement current in the current sensor measuring device 10 having a current sensor portion 11 equipped with a coil material 1 and a measuring portion 12 to 1 A or more and 1800 A or less, once the coil material 1 is attached to a specified electrical circuit S such as a main electrical circuit, the current sensor measuring device 10 alone can measure the current value flowing in the specified electrical circuit S even if the current value flowing in the specified electrical circuit S changes significantly. Furthermore, this current sensor measuring device 10 can also be said to be an "ultra-wide area current sensor measuring device." Conversely, without such an "ultra-wide area current sensor measuring device," every time the current value flowing in a specific electric circuit S changes significantly, it would be necessary to open the specific electric circuit S, such as the main electric circuit through which high-voltage current flows, or to disconnect the grid-connected equipment, load devices, and power generation equipment connected to the main electric circuit, etc. However, this opening and disconnection requires the main electric circuit, grid-connected equipment, load devices, power generation equipment, etc. to be completely shut down, and during this shutdown period, the load devices cannot be used or power generation cannot be performed by the power generation equipment (due to the shutdown of factories, businesses, and power generation), resulting in extremely large losses. Therefore, such an "ultra-wide area current sensor measuring device" can reduce losses.

[0014] In addition, by not having any coils other than the coil material 1, errors caused by electromagnetic induction in unnecessary coils can be eliminated, and further "reduction of measurement errors" can be achieved.

[0015] Then, by attaching the coil material 1 to at least two of the three conductors of a specified electrical circuit S so that the conductors pass through an approximately circular coil section 2 having shielding sections 3 on both the inner and outer sides, it is possible to "reduce the electrical influence" from the two conductors other than the conductor that passes through the approximately circular coil section 2, while also being able to attach the coil material 1 as close as possible to the three conductors, thereby achieving "space saving in the installation space." [Effects of the Invention]

[0016] The coil material, current sensor measuring device, and coil mounting system of the present invention can achieve "reduction of electrical influence" from a specified electrical path by grounding at least the conductive shield portion provided on the inner periphery of the approximately circular core winding. [Brief explanation of the drawings]

[0017] [Figure 1] 1A and 1B are schematic diagrams showing a coil material and a coil mounting system according to the present invention, in which (a) is a perspective view showing an overview of the coil material, (b) is a front view showing an overview of the coil mounting system, and (c) is a side view showing an overview of the coil mounting system. Note that the dark colored part in (a) indicates the shield part inside the encapsulation part and between the substantially circular coil part. [Figure 2] 1 is a schematic diagram showing a current sensor measuring device (current sensor unit, measuring unit, etc.) according to the present invention. [Figure 3] These are photographs in lieu of drawings illustrating coil material, where (a) shows coil material with an encapsulated portion (furthermore, A on the left shows coil material with a cushion portion, and B on the right shows coil material without a cushion portion), and (b) shows coil material without an encapsulated portion (black, with no cushion portion, and no shield portion or shield wire). [Figure 4]1A and 1B are schematic diagrams showing test configurations for coil materials and current sensor measuring devices, where (a) shows test configuration 1 for measuring ratio errors, and (b) shows test configuration 2 for measuring phase angles. [Figure 5] These are photographs used in place of drawings to show how the primary input wire is wound around the coil material in a test to measure the ratio error and phase angle of the coil material and current sensor measuring device. (a) shows the coil material with an enclosed section and a cushion section (A on the left in Figure 3(a)), (b) shows the coil material with an enclosed section but without a cushion section (B on the right in Figure 3(a)), and (c) shows the coil material without an enclosed section, cushion section, or shield section (black in Figure 3(b)). [Figure 6] Graphs showing test results for a coil material with an enclosed portion and a cushion portion (A on the left in FIG. 3(a)), where (a) shows the test results for the ratio error and (b) shows the test results for the phase angle. The horizontal axes of graphs (a) and (b) are logarithmic. [Figure 7] Graphs showing test results for a coil material with an enclosed portion but no cushion portion (B on the right in FIG. 3(a)), where (a) shows the test results for the ratio error and (b) shows the test results for the phase angle. The horizontal axes of graphs (a) and (b) are logarithmic. [Figure 8] This graph shows the test results for a coil material with an encapsulation section and a cushion section (A on the left in Figure 3(a)), a coil material with an encapsulation section and no cushion section (B on the right in Figure 3(a)), and a coil material without an encapsulation section, no cushion section, and no shield section (black in Figure 3(b)), where (a) shows the test results for the ratio error and (b) shows the test results for the phase angle. The horizontal axes of graphs (a) and (b) are displayed logarithmically. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <Overall structure of coil material 1> 1 to 5 show a coil material 1 according to the present invention. The coil material 1 is a member to be attached to a predetermined electrical path S, and has a substantially circular coil portion 2, which will be described later, and a shield portion 3, which will be described later. The coil material 1 may have an encapsulation portion 4, which will be described later, and a cushion portion 5, which will be described later. In addition, the coil material 1 may have a coil circuit 1a described later, or a coil housing that has an approximately circular coil section 2, a shield section 3, etc. inside instead of the encapsulation section 4 described later.

[0019] In addition, the "electrical circuit S" in this invention is something that carries electricity (current) and is a conductor such as copper, aluminum, silver, gold, or nichrome, and the conductor may be covered with an insulating coating or the like, and includes general cables and electric wires. In addition, in the present invention, "attached to a specified electrical circuit S" includes cases where the electrical circuit S is attached so that it passes within the approximately circular coil portion 2 of the coil material 1, and cases where the coil material 1 is attached to at least two of three conductors S' arranged in parallel, which is the specified electrical circuit S, or to cables, etc., so that the conductors S', etc. pass within the approximately circular coil portion 2 of the coil material 1, and also includes cases where the coil material 1 is attached to at least one conductor S' of two or four or more conductors S' arranged in parallel, etc., which is the specified electrical circuit S, so that the conductor S' passes within the approximately circular coil portion 2 of the coil material 1. Furthermore, in the present invention, "the electrical circuit S is attached so as to pass through the approximately circular coil portion 2 of the coil material 1" means that the electrical circuit S is attached in a state where it passes through a hole located approximately in the center of the approximately circular coil portion 2 of the coil material 1, and conversely, it can also be said that the coil material 1 surrounds the electrical circuit S.

[0020] The outer diameter 1D, inner diameter 1d, thickness 1W, and width 1H of the coil material 1 (including the shielding portion 3, encapsulating portion 4, and cushioning portion 5, which will be described later) are not particularly limited. First, the upper limit of the outer diameter 1D may be, for example, 220 mm or less, preferably 200 mm or less, and more preferably 180 mm or less, and the lower limit may be, for example, 100 mm or more, preferably 120 mm or more, and more preferably 140 mm or more (e.g., 159.60 mm, 160.00 mm, etc.). The upper limit of the inner diameter 1d of the coil material 1 may be, for example, 160 mm or less, preferably 140 mm or less, and more preferably 120 mm or less, and the lower limit may be, for example, 40 mm or more, preferably 60 mm or more, and more preferably 80 mm or more (e.g., 97.20 mm, 97.80 mm, 100.00 mm, etc.). Furthermore, the width 1w of the coil material 1 can be said to be half the difference between the outer diameter 1D and the inner diameter 1d ((outer diameter 1D - inner diameter 1d) / 2), and although its value is not particularly limited, its upper limit may be, for example, 45 mm or less, preferably 40 mm or less, and more preferably 35 mm or less, and its lower limit may be, for example, 15 mm or more, preferably 20 mm or more, and more preferably 20 mm or more (e.g., 30.00 mm), and it can also be said that a thinner width 1w is preferable. There is no particular limitation on the thickness 1H of the coil material 1, but the upper limit may be, for example, 70 mm or less, preferably 60 mm or less, and more preferably 50 mm or less, and the lower limit may be, for example, 10 mm or more, preferably 20 mm or more, and more preferably 30 mm or more (38.80 mm, 38.95 mm, 55.00 mm, etc.). Note that the lower limit values ​​of the outer diameter 1D, inner diameter 1d, width 1w, and thickness 1H of the coil material 1 may be combined with any of the upper limits. The cross-sectional shape of the substantially circular coil portion 2 may be, for example, substantially rectangular (substantially rectangular or substantially square), or may be substantially circular, substantially elliptical, or substantially triangular.

[0021] <Nearly circular coil part 2> As shown in FIGS. 1 to 5, the substantially circular coil portion 2 is a coil member having a substantially circular shape (a substantially ring-like or substantially annular shape) in a plan view, and the substantially circular coil portion 2 can also be said to have a substantially circular cylindrical shape. Here, to explain in detail the shape of the substantially circular coil portion 2 in plan view, it may be strictly circular in plan view, or may be slightly elliptical in plan view. The substantially circular coil portion 2 includes a core 2a, which will be described later, and a winding 2b, which will be described later. The width 2w and thickness 2H of the approximately circular coil portion 2 (including the core 2a and winding 2b described below) are not particularly limited. First, the upper limit of the width 2w may be, for example, 35 mm or less, preferably 30 mm or less, and more preferably 25 mm or less, while the lower limit may be, for example, 5 mm or more, preferably 10 mm or more, and more preferably 15 mm or more (e.g., 19 mm). The upper limit of the thickness 2H of the approximately circular coil portion 2 may be, for example, 45 mm or less, preferably 40 mm or less, and more preferably 35 mm or less, while the lower limit may be, for example, 15 mm or more, preferably 20 mm or more, and more preferably 20 mm or more (e.g., 29 mm). Note that the lower limit of the width 2w and thickness 2H of the approximately circular coil portion 2 may be combined with any of the upper limits. Alternatively, the substantially circular coil portion 2 may include a coil bobbin around which the winding 2b is wound and attached to the core 2a.

[0022] <Core 2a> 1 to 5 (particularly, FIG. 1(c)), the core 2a can also be said to be an iron core member (magnetic core member), and the shape of the core 2a is generally circular in plan view (i.e., generally circular cylindrical or ring-shaped as a whole). In more detail, the shape may be strictly circular in plan view, or may be slightly elliptical in plan view. There may be only one core 2a for one approximately circular coil portion 2, but there may also be multiple cores 2a, and if there are multiple cores 2a, the approximately circular coil portion 2 may be equipped with a fixing device that fixes the multiple cores 2a together. The material of the core 2a may be silicon steel such as oriented silicon steel or ultra-thin silicon steel, electromagnetic steel, dust material such as iron dust, sendust, or permalloy, ferrite material, amorphous, Finemet (registered trademark), etc. The core 2a may be formed by laminating a plurality of thin plates, and in this case, the laminated plurality of thin plates may be bonded to each other with an adhesive, etc. Also, a coating (film) for rust prevention, insulation, etc. may be formed on the surface of the core 2a.

[0023] <Winding 2b> As shown in Figures 1 to 5 (particularly Figure 1(c)), the winding 2b is an electric circuit wound around the above-mentioned core 2a, and can also be said to be the portion (winding portion 2b) that covers the core 2a. The winding 2b can also be called an electric wire, and its material can be any material or type of wire that can carry an electric current, such as polyurethane copper wire (UEW), polyester copper wire (PEW), polyamideimide copper wire (AIW), or other copper, nichrome wire, silver, gold, aluminum, or the like. The diameter of the wound wire 2b is not particularly limited, but may be 0.1 mm to 10.0 mm, preferably 0.2 mm to 5.0 mm, and more preferably 0.3 mm to 1.0 mm (such as 0.6 mm). The number of times that the winding 2b is wound (number of turns) is not particularly limited, but the upper limit may be, for example, 50,000 turns or less, preferably 25,000 turns or less, more preferably 10,000 turns or less, and even more preferably 2,000 turns or less (e.g., 750 turns or 1,000 turns), and the lower limit may be, for example, 10 turns or more, preferably 100 turns or more, more preferably 300 turns or more, and even more preferably 500 turns or more. Note that each lower limit for the number of turns of the winding 2b may be combined with any of the upper limits.

[0024] Furthermore, when a plurality of windings 2b are provided around the core 2a of one substantially circular coil portion 2, the number of turns of each winding 2b may be the same or different. Furthermore, the number of turns of the winding 2b around the core 2a (if there is one winding 2b, it is the number of turns of that winding 2b, and if there are multiple windings 2b, it is the total number of turns of the multiple windings 2b) can be said to be one for the specified electrical circuit S to be measured, so the current transformation ratio between the primary side (the side of the specified electrical circuit S) and the secondary side (the output (coil electrical circuit 1a) side from the coil material 1) of the coil material 1 is the number of turns of the winding 2b in the approximately circular coil portion 2 relative to the number of turns in the specified electrical circuit S, which is 1 (i.e., 1: number of turns of the winding 2b in the approximately circular coil portion 2).

[0025] When winding this winding 2b, a winding machine such as a spindle type winding machine, a flyer type winding machine, or a trace alignment winding machine may be used, or it may be manually wound. When winding in an aligned manner using a winding machine, a certain amount of tension must be applied to the winding 2b to keep the winding 2b taut in order to achieve neat, aligned winding. Therefore, the winding 2b at the beginning and end of the winding may be temporarily secured with tape or may be hooked onto the above-mentioned retaining pin. From the winding 2b wound in this manner, one end and the other end (i.e., the start and end of the winding, so to speak) of the winding may protrude as lead wires or the like, or the two wound windings 2b may be connected in series by connecting (establishing electrical continuity) one end or the other end (or one end and the other end) of each winding with screws or the like. Alternatively, the winding 2b wound a predetermined number of times around the core 2a may be covered with a cushion portion 5, which will be described later, and another winding 2b may be wound over the cushion portion 5 (i.e., the cushion portion 5 may be sandwiched between the windings 2b). Each of the two wound windings 2b connected in series may be provided with a round or open-ended connection terminal at the end that is not connected to the other, and these connection terminals may be color-coded, for example, red and blue.

[0026] <Coil circuit 1a> As shown in FIGS. 1 to 5, the coil electric circuit 1a is an electric circuit that outputs a current (sensor current) output from the substantially circular coil portion 2, and may be two electric wires (k, l (lowercase L), secondary side wires) that are conducted to one end and the other end (i.e., the start and end of the winding) of the above-mentioned winding 2b. The coil electric circuit 1a may be connected to a measuring portion 12 (described later) via a variable resistor (varistor). The coil electric circuit 1a does not have to be grounded, or conversely, it may be grounded. The value of the current flowing through this coil circuit 1a and output from the coil material 1 does not need to be particularly limited, but is also related to the current transformation ratio between the primary and secondary sides in the above-mentioned coil material 1 (i.e., the number of turns of the winding as a whole of the approximately circular coil portion 2 (if there is one wound winding 2b, this is the number of turns of that winding, and if there are multiple wound windings 2b, this is the total number of turns of the multiple windings 2b)), and may be, for example, 1 A or less.

[0027] That is, the output current is not particularly limited, and its upper limit may be, for example, 2 A (2000 mA) or less, preferably 1000 mA or less, more preferably 500 mA or less, and even more preferably 100 mA or less, and its lower limit may be, for example, 0.01 mA or more, preferably 0.10 mA or more, more preferably 0.20 mA or more, and even more preferably 0.30 mA or more (such as several hundred mA, several tens of mA, or 1 mA to 50 mA). Note that each lower limit of the output current may be combined with any of the upper limits. Based on the value of the current flowing through this coil electric circuit 1a, a current sensor measuring device 10 (to be described later) measures the value of the current flowing through a predetermined electric circuit S that is the measurement target.

[0028] <Shield part 3> As shown in Figures 1 to 5 (particularly Figure 1(c)), the shield portion 3 is a conductive member provided at least on the inner circumferential side of the winding 2b wound around the core 2a in the above-mentioned approximately circular coil portion 2, and this shield portion 3 is grounded. In addition, in the present invention, "the shield portion 3 is provided at least on the inner side of the winding 2b wound around the core 2a of the approximately circular coil portion 2" does not only mean that the shield portion 3 is provided on the inner side of the winding 2b wound around the core 2a of the approximately circular coil portion 2, but also means that the shield portion 3 is provided on the outer side of the winding 2b wound around the core 2a of the approximately circular coil portion 2, or that the shield portion 3 is provided on the outer side, upper side and / or lower side of the winding 2b wound around the core 2a of the approximately circular coil portion 2. Furthermore, in the present invention, the terms "inner peripheral side," "outer peripheral side," "upper side," and "lower side" refer to the inner peripheral surface side, outer peripheral surface side, upper surface side, and lower surface side if the cross-sectional shape of the approximately circular coil portion 2 is angular (such as approximately rectangular), and refer to the inner peripheral portion, outer peripheral portion, upper portion, and lower portion if the cross-sectional shape of the approximately circular coil portion 2 is rounded (such as approximately circular or approximately elliptical).

[0029] The specific configuration of the shielding section 3 is not particularly limited, but for example, a copper tape may be placed between the substantially circular coil section 2 (the winding (winding section) 2b wound to cover the core 2a) and the encapsulating section 4 or cushion section 5 described below, and the copper tape may cover the inner periphery of the winding section 2b. The shape of the shielding section 3 is also not particularly limited, but for example, if it is a tape-like material as described above, it may be wound around the inner periphery of the winding section 2b in the inner periphery direction, or around the outer periphery of the winding section 2b in the outer periphery direction, or the upper and lower sides may be covered with multiple tape-like materials. Alternatively, the shielding section 3 may be layered or a braided strand. The material of the conductive shield portion 3 may be, for example, a metal such as copper, aluminum, tin, or tin-plated soft copper, or may be a conductive polymer.

[0030] Furthermore, the conductive shield section 3 may be provided with a shield wire 3a that is electrically connected to the shield section 3, and the shield section 3 may be grounded by grounding this shield wire 3a. The specific configuration of the shield wire 3a is not particularly limited. For example, if the inner circumferential side and other sides (outer circumferential side, upper side, lower side) of the winding portion 2b are covered with multiple copper tapes, the shield wire 3a may be an electric wire (ground, secondary side wire) that is electrically connected to one of the multiple copper tapes as long as the copper tapes are in contact with each other and are electrically connected. Alternatively, if the shield portion 3 is made of a single copper tape or the like that covers both the inner circumferential side and the outer circumferential side, the shield wire 3a may be electrically connected to only one end (one end) of the shield portion 3. In this case, the shield wire 3a is grounded, making the shield portion 3 one-ended grounded. Furthermore, if the inner circumferential side and the outer circumferential side are covered with a single copper tape or the like, the shield wire 3a may be present at both ends of the shield portion 3. In this case, the shield wire 3a is grounded, making the shield portion 3 both-end grounded.

[0031] <Enclosure 4> 1 to 5, the encapsulation portion 4 is a portion in which the above-mentioned substantially circular coil portion 2 is encapsulated with synthetic resin, and can also be considered a molded portion. The encapsulation portion 4 may be provided with an attachment portion 4A, which will be described later, and can also be considered a coil housing. The synthetic resin that is the material of the encapsulating portion 4 is not particularly limited, but may be, for example, epoxy (EP) resin, silicon (Si) resin, polyurethane (PU) resin, etc., and these synthetic resins are poured around the approximately circular coil portion 2, or the approximately circular coil portion 2 and the shield portion 3, and then hardened. Such an encapsulation section 4 improves the protective properties, electrical insulation, heat resistance, and environmental resistance of the approximately circular coil section 2 and the shield section 3, and by protecting the approximately circular coil section 2 and the shield section 3 from influences and damage from the external environment, it can be said that reliability and lifespan are also improved. Furthermore, when the approximately circular coil portion 2 and the shield portion 3 are encapsulated in synthetic resin (this can also be called molding processing), the synthetic resin may be vacuum degassed to prevent air bubbles from forming in the synthetic resin, and this vacuum degassing can also be said to make the synthetic resin approximately uniform.

[0032] The shape of the encapsulating portion 4 is not particularly limited, but may be, for example, approximately cylindrical (in the shape of wound duct tape), approximately annular, or approximately ring-shaped. Even if the surfaces of the approximately circular coil portion 2 or shield portion 3 are slightly uneven or the corners are rounded, the encapsulating portion 4 after encapsulation can have uniform curved surfaces (side surfaces) on the inner and outer sides, and flat surfaces (planar surfaces) on the upper and lower sides. Alternatively, the shape of the encapsulated portion 4 may have one or more grooves 4a formed on its upper or lower side (or front or rear side) approximately along the circumferential direction (for example, the depth of the groove 4a at the upper part of Figures 1(b) and (c) is 7 mm, and the depth of the groove 4a at the lower part of Figures 1(b) and (c) is 5 mm), and the encapsulated portion 4 from the bottom of the groove 4a to the encapsulated approximately circular coil portion 2 has a predetermined thickness (for example, 6 mm). Furthermore, the thickness from the inner periphery of the enclosed portion 4 to the inner periphery of the approximately circular coil portion 2 enclosed inside may be thicker than the thickness from the outer periphery of the enclosed portion 4 to the outer periphery of the approximately circular coil portion 2 enclosed inside (for example, the thickness of the enclosed portion 4 on the inner periphery side may be 6 mm or more and the thickness of the enclosed portion 4 on the outer periphery side may be 4 mm or more), or they may be approximately equal or thinner.

[0033] <Attachment portion 4A of the encapsulation portion 4> As shown in FIGS. 1(b) and (c), the attachment portion 4A of the enclosing portion 4 extends outward from a part of the outer periphery of the enclosing portion 4 body. The specific configuration of the mounting portion 4A is not particularly limited, but the upper limit of the extension length 4AL of the mounting portion 4A may be, for example, 100 mm or less, preferably 90 mm or less, and more preferably 80 mm or less, and the lower limit may be, for example, 40 mm or more, preferably 50 mm or more, and more preferably 60 mm or more (e.g., 68 mm). The lower limit of the extension length 4AL may be combined with any of the upper limits. The shape of the mounting portion 4A is also not particularly limited, but it may be, for example, a substantially rectangular parallelepiped or cubic shape extending from the outer periphery of the encapsulation portion 4. In the following description, the shape of the mounting portion 4A will be mainly described as being substantially rectangular parallelepiped. The mounting portion 4A may be provided with secondary terminals of the two electric wires (k, l) that form the coil electric circuit 1a from the approximately circular coil portion 2 (these secondary terminals can also be considered to be part of the coil electric circuit 1a), a ground terminal such as the shield wire 3a (shield earth, E) of the shield portion 3 (this ground terminal can also be considered to be part of the shield wire 3a), and in addition, test terminals (kt, lt) may also be provided. The locations where these terminals are disposed are not particularly limited, and may be the bottom surfaces of recesses (terminal recesses) 4b on both sides (upper and lower sides, or front and rear sides) of the lower part of the approximately rectangular parallelepiped mounting part 4A. These terminal recesses 4b have a predetermined depth (e.g., 7 mm), left-right width (e.g., 54 mm), and top-bottom width (e.g., 18 mm), and the centers of the terminals disposed on the bottom surface are at a predetermined height (e.g., 19 mm) from the surface (mounting surface) M to which the mounting part 4A is attached. Furthermore, the mounting portion 4A may have fixing means for fixing the mounting portion 4A to the mounting surface M. For example, fixing means (or fixing screws or screw holes for threading the fixing screws, etc.) 4c may be provided in multiple locations (for example, four locations) on the bottom surface (the surface on the mounting surface M side) of the approximately rectangular parallelepiped mounting portion 4A, and the four fixing means 4c have a predetermined depth (for example, 8 mm) and a predetermined left-right spacing (for example, 60 mm) or front-to-back spacing (for example, 32 mm). In addition, the mounting portion 4A may be provided with a recess (test winding recess) 4d that is approximately cross-shaped in plan view and extends vertically upward from the bottom surface of the approximately rectangular parallelepiped mounting portion 4A in order to wind a winding (winding for primary input) for testing, and a protrusion (test winding protrusion) 4e that gently protrudes vertically upward on the inner periphery of the approximately circular coil portion 2 (enclosed portion 4) and on the vertically opposite side of this test winding recess 4d. In particular, since the test winding recess 4d is approximately cross-shaped, even when the mounting portion 4A is attached to the mounting surface M, the upper and lower (or front and rear) sides of the mounting portion 4A are open by a predetermined width (e.g., 40 mm), and the left and right sides of the mounting portion 4A are also open by a predetermined width (e.g., 14 mm).As a result, the mounting portion 4A can be said to be fixed to the mounting surface M in the form of four legs, and the test winding recess 4d has a predetermined depth (e.g., 8 mm).

[0034] <Cushion part 5> As shown in Figures 1 to 5 (particularly Figure 1(c)), the cushion portion 5 is a cushioning member provided between the above-mentioned encapsulation portion 4 and the approximately circular coil portion 2, or inside the approximately circular coil portion 2. The specific configuration of the cushion portion 5 is not particularly limited, and for example, the cushion portion 5 may be provided only between the enclosed portion 4 and the substantially circular coil portion 2, between the inner circumferential side of the winding portion 2b of the substantially circular coil portion 2 and the enclosed portion 4 (all or part of the circumferential direction of the substantially circular coil portion 2) (see FIG. 1(c)), or the cushion portion 5 may be provided between the enclosed portion 4 and at least one of the inner circumferential side and outer circumferential side (all or part of the circumferential direction of the substantially circular coil portion 2), upper side, and lower side of the winding portion 2b of the substantially circular coil portion 2. Alternatively, as described above, the cushion portion 5 may be provided between the windings 2b inside the substantially circular coil portion 2, or between the core 2a and the winding 2b. The material of the cushion portion 5 is not particularly limited, but may be, for example, a foamed synthetic resin such as polyurethane (PU) resin, polyethylene (PE) resin, polypropylene (PP) resin, or polystyrene (PS) resin, or may be a rubber sheet, or a fabric such as a nonwoven fabric, woven fabric, or knitted fabric, or a textile product. The current sensor measuring device 10 using the coil material 1 described above will be explained in detail below.

[0035] <Current sensor measuring device 10> 1 to 5 show a current sensor measuring device 10 according to the present invention. The current sensor measuring device 10 is a device that measures the value of a current flowing through a predetermined electrical path S, and has a current sensor portion 11 and a measuring portion 12, which will be described later. The current sensor measuring device 10 may have a measuring section 12 equipped with a correction section 13 (described later), and may also have a relay section 14 and a housing 15 . The current sensor measuring device 10 may have an output section (not shown) that digitizes the output current from the current sensor section 11 described later and outputs it to the measuring section 12 described later or the control section of the power plant via a wired communication cable or wirelessly. The current sensor measuring device 10 may have any value for the detection interval by the current sensor portion 11 or the output interval (communication speed) of the above-mentioned output section, but for example, the output interval may be 0.1 seconds or less, 0.05 seconds or more and 2.00 seconds or less, 0.75 seconds or more and 1.50 seconds or less, or 0.10 seconds or more and 1.00 seconds or less (e.g., 0.1 seconds).

[0036] The rated range of the current measured by such a current sensor measuring device 10 is not particularly limited, but the upper limit may be, for example, 1800 A or less, preferably 1650 A or less, and more preferably 1500 A or less, and the lower limit may be, for example, 1 A or more, preferably 5 A or more, and more preferably 10 A or more. Note that each lower limit of the rated range of the current to be measured may be combined with any of the upper limits. Here, the "rated range of the current to be measured" in this invention refers to the range of the rated current, and the "rated current" can also be said to be the limit value of the current guaranteed by the manufacturer for the safe use of an electrical appliance, and further, the "rating" can also be said to be the usage limit or condition under which the safe and proper operation of a device or apparatus is guaranteed. In the present invention, the "value of current (current value)" refers to an effective value. Furthermore, the maximum value of the range of current actually flowing through the coil material 1 or the current sensor measuring device 10 may be 10 to 20 times the maximum value of the rated range of the current described above (for example, 40,000 A, 36,000 A, 30,000 A, etc.), and the minimum value of the range of current actually flowing through the coil material 1 or the current sensor measuring device 10 may be 0 A. Next, the current sensor portion 11 will be described below.

[0037] <Current sensor part 11> 2 and 4, the current sensor portion 11 is a portion that detects the current in the above-mentioned predetermined electric circuit S, and it can also be said that the current sensor measuring device 10 has a current detection function. It can also be said that the current sensor portion 11 is the above-mentioned coil material 1 itself, and the current sensor portion 11 also outputs the sensor current output from the approximately circular coil portion 2 to the measuring portion 12 described below via the coil electric circuit 1a. The specified electrical circuit S through which the current sensor portion 11 detects current is not particularly limited, but may be, for example, a three-phase three-wire (3φ3W) circuit similar to the system described below, a circuit through which a current (AC current) with a voltage of 6600V, 22000V, 3300V, etc. and a frequency of 60Hz or 50Hz flows, or a circuit through which a current such as a single-phase two-wire (1φ2W) or single-phase three-wire (1φ3W) current flows. More specifically, the specified electrical circuit S in which the current sensor portion 11 measures (detects) the current may be, for example, in a power plant, an electrical circuit from the system via a system interconnection panel to a load (hereinafter referred to as the "main electrical circuit"), a branch electrical circuit to a power generating device, or a secondary electrical circuit of an instrument current transformer inside a system interconnection panel.

[0038] Furthermore, if the current sensor portion 11 is directly attached to the main circuit, or attached to the secondary circuit of an instrument current transformer, and the current sensor portion 11 can detect the current value of the main circuit, etc., the voltage value (potential) of the main circuit, etc. will be the same potential as that of the system (6600V, 22000V, 3300V, etc.), and therefore the product of the current value of the main circuit, etc. detected by the current sensor portion 11 and the voltage value of the main circuit, etc., can be said to be the power in the main circuit, etc., or the sold power (reverse power) flowing into the system detected by the current sensor portion 11, or the purchased power (received power) flowing from the system. The same is true when current sensor portion 11 is connected to the low-voltage side of a pole transformer (step-down transformer). As long as current sensor portion 11 can detect the current value on the low-voltage side of the pole transformer, the power will be approximately the same on the high-voltage side and low-voltage side of the pole transformer (if iron loss, copper loss, etc. are ignored). Therefore, it can be said that the product of the current value on the low-voltage side of the pole transformer detected by current sensor portion 11 and the voltage value on the low-voltage side of the pole transformer is the power in the system (the sold power (reverse power) flowing into the system detected by current sensor portion 11 and the purchased power (received power) flowing from the system).

[0039] There may be only one such current sensor portion 11 in one current sensor measuring device 10, but there may also be a plurality of such current sensor portions 11. The current sensor portion 11 may have any configuration as long as it can detect the current in the specified electrical path S, but it may also be, for example, a flux gate type (open loop type, closed loop type, etc.), a Hall element type (open loop type, closed loop type, etc.), a CT (Current Transformer) type, a Rogowski coil type, etc. There are no particular limitations on the power supply for the current sensor measuring device 10, but it may be the same as the voltage of the electrical circuit being measured as described above (i.e., 110V, 220V, 440V at 60Hz or 50Hz, or 100V or more and 200V or less), or it may be DC 100V or 110V. The current sensor portion 11 is not particularly limited as long as it can detect current, but may be, for example, electronic or mechanical, three-phase (a method of detecting two phases out of three phases and three wires), or single-phase.

[0040] Furthermore, as described above for the coil material 1, the current sensor portion 11 is not particularly limited in terms of the current transformation ratio between the primary side (the side of the specified electrical circuit S) and the secondary side (the output from the current sensor portion 11 (coil electrical circuit 1a) side), but for example, the minimum value may be 10:1 or 100:1, and the maximum value may be 5000:1 or 20000:1 (1500:1, 15000:1, etc.). In other words, if the current transformation ratio between the primary and secondary sides of the current sensor portion 11 is 1500:1, even if the current value flowing through the circuit to be measured is very large, for example, 1500 A, the current value output from the current sensor portion 11 will be approximately 1 A (1000 mA), and if the current transformation ratio between the primary and secondary sides of the current sensor portion 11 is 15000:1, even if the current value flowing through the circuit to be measured is very large, for example, 1500 A, the current value output from the current sensor portion 11 will be approximately 0.1 A (100 mA). The detectable range of the current sensor portion 11 is not particularly limited, but is the same as that of the current sensor measuring device 10 described above. Such a current sensor portion 11 may be attached at any position relative to the specified electric circuit S as long as it can detect the current in the specified electric circuit S, but it may also be attached to, for example, the main electric circuit described above, or to the low voltage side of a pole transformer or the secondary electric circuit of an instrument current transformer.

[0041] <Measurement part 12> As shown in FIGS. 2 and 4, the measurement section 12 is a section that measures at least the value of the current in a predetermined electrical path S based on the current output from the current sensor section 11 described above via the coil electrical path 1a. The measurement section 12 may include a correction section 13, which will be described later. The measuring portion 12 may be built into the housing 15 (provided within the housing 15). The configuration of the measurement section 12 is not particularly limited, but may include, for example, an A / D converter, a CPU (central processing unit) that processes the A / D converted current value output from the current sensor section 11, memory, and an LCD (liquid crystal display) described below.In addition, the measurement section 12 may include an auxiliary CT (auxiliary current transformer) between the current sensor section 11 and the A / D converter or CPU. Furthermore, if the measurement part 12 is equipped with an auxiliary CT, the current transformation ratio between the primary side (the input (coil circuit 1a) side from the current sensor part 11) and the secondary side (the A / D converter side or CPU side) of the auxiliary CT is not particularly limited, but for example, the minimum value may be 2:1 or 3:1, and the maximum value may be 50:1 or 30:1 (10:1, 20:1, etc.).

[0042] However, since a coil is also present in the auxiliary CT, it can be said that the provision of the auxiliary CT in the measurement portion 12 increases errors caused by electromagnetic induction in the extra coil. Therefore, the current sensor measuring device 10 does not need to have any coils other than the above-mentioned coil material 1, including the coil in the auxiliary CT.In this case, it is possible to eliminate errors caused by electromagnetic induction in unnecessary coils, and it can be said that further ``reduction of measurement errors'' can be achieved. In addition, the measurement part 12 measures at least the value of the current in a specified electric circuit S. In addition to the current value, if the measurement part 12 is also connected to the low voltage side of an instrument transformer in a grid interconnection panel, it may also measure the voltage and power values ​​in the specified electric circuit S, as well as reactive power, power factor, electric energy, reactive energy, etc. Additionally, the measuring section 12 may measure the frequency of an AC current at a predetermined power or the zero-phase current.

[0043] <Correction part 13> As shown in Figures 2, 6 to 8, the correction part 13 is provided in the above-mentioned measurement part 12, and is a part that corrects the value of the current in a specified electrical path S measured by the measurement part 12 based on the current output from the above-mentioned current sensor part 11. The correction section 13 is not particularly limited in the correction it performs, but for example, as described above in Figures 6 to 8, the current value (detected value) output from the current sensor section 11 tends to be smaller than the reference value, and in the range where this small value is obtained, a correction may be performed such that the value measured by the measurement section 12 is set to a value corresponding to the ratio error (such as the detected value multiplied by the reciprocal of the average value of the ratio errors in Figures 6 to 8 (which may be an average value excluding exceptional cases)). Here, with regard to the range in which the detected value from the current sensor portion 11 is smaller than the reference value, for example, in the above-mentioned Figures 6 to 8, the above-mentioned correction may be performed in all ranges other than the range in which the ratio error is 0%, but it is also possible to perform a correction in which the value measured by the measurement portion 12 is a value corresponding to the ratio error only when the input current value is equal to or less than a predetermined value (for example, 10 AT). Alternatively, the correction by the correction unit 13 may be a correction in which the value measured by the measurement unit 12 is a value obtained by linearly scaling the detected value. The configuration of the correction unit 13 is not particularly limited, but for example, the correction by the correction unit 13 may be calculated and processed by the CPU in the measurement unit 12 described above, and can also be said to be software.

[0044] <Relay part 14> As shown in Figure 2, the relay part 14 is a part that performs relay operation according to the value (value of current, etc.) in a specified electrical circuit S measured by the above-mentioned measuring part 12, and when it has the relay part 14, it can also be said that the current sensor measuring device 10 has a relay function. Here, in the present invention, "according to the value in the specified electrical circuit S measured by the measuring part 12" means that when the measured current, etc., becomes equal to or greater than a specified value (threshold) (exceeds the threshold) or becomes equal to or less than a specified value (threshold) (falls below the threshold), the relay operation described below is performed. Furthermore, the threshold current value or other value may be, for example, not only current such as overcurrent, instantaneous overcurrent, or earth fault overcurrent, but also voltage values ​​such as undervoltage, power values ​​such as reverse power, or frequency values. Furthermore, "according to the value in a specified electrical circuit S measured by the measuring part 12" includes not only the case where the relay operation described below is performed immediately after the measured value of the current value, etc., becomes equal to or exceeds a specified value (threshold value), but also the case where the next relay operation is performed after a specified time has elapsed.

[0045] The specified time may be 0.1 to 15.0 seconds, 0.2 to 5.0 seconds, 0.5 to 3.0 seconds (e.g., 2.0 seconds) after the threshold is exceeded or fallen below (i.e., if 2.0 seconds or more have elapsed after the threshold is exceeded, the relay operation described below may be performed), and the specified time may be adjustable from 0.0 to 15.0 seconds in 0.1 second increments (0.0, 0.1, 0.2, ... 15.0 seconds). Furthermore, in the present invention, "relay operation" means, for example, in a power plant, an operation of interrupting an electric path from the power generation plant to the grid via a signal using a circuit breaker, or, if the power generation plant has a power conditioner (a power conditioner that converts direct current or alternating current into alternating current), stopping the conversion of the power conditioner. The signal from the relay section 14 may include, in addition to the above-mentioned "trip" signal (signal to cut off) to the circuit breaker, an "on" signal to the circuit breaker (signal to turn the circuit breaker itself on), a "off" signal to the circuit breaker (signal to turn the circuit breaker itself off), a signal to release the cut-off of a specified electrical circuit S, etc. Furthermore, the signal from the relay section 14 may include a signal to stop the conversion of the power conditioner or a signal to start the conversion of the power conditioner.

[0046] The configuration of the relay portion 14 is not particularly limited, and it may be, for example, a contact type (electromagnetic type) using an electromagnet, or a contactless type using a semiconductor element. Furthermore, if it is an electromagnetic type, it may be, for example, a make type (a contact that closes when current is passed through the electromagnet), a break type (b contact that opens when current is passed through the electromagnet), a transfer type (c contact that switches multiple contacts by passing current through the electromagnet), a ratchet type (the contacts are opened and closed each time current is passed through the electromagnet), or any other configuration, such as a polarized relay type in which a permanent magnet is provided in parallel with the electromagnet. Although only one such relay portion 14 (one element) may exist in one current sensor measuring device 10, multiple relay portions (multiple elements) may also exist.

[0047] <Case 15> As shown in FIG. 2, the housing 15 is a housing that houses at least the measurement portion 12. The housing 15 can also be called a measurement housing 15 when the coil material 1 has a measurement portion 12 but does not have a relay portion 14, and can also be called a measurement relay housing 15 when the coil material 1 has both a measurement portion 12 and a relay portion 14. The housing 15 may be provided with a display unit such as an LCD (liquid crystal display) that displays values ​​such as the current value measured by the measuring portion 12 described above, so that the display unit can be seen from the outside, and this display unit may be provided with a backlight. The content displayed on the display unit may not only be the current value measured by the measuring unit 12, but may also include voltage, power, or numbers indicating the mode or state. Additionally, the housing 15 may have an operation unit, and there are no particular limitations on the configuration, role, position, etc. of this operation unit, but for example, it may be provided with a plurality of buttons.

[0048] The operation unit may have the following functions: a button to turn the display unit on and off (display button), a reset button to reset the coil material 1, a button to select a mode or state (such as a "+" button or a "-" button), or a set button to confirm (set) the selected mode, etc. The position of such an operation unit may also be provided, for example, on the front surface of the housing 15, below the display unit described above. The housing 15 may have a terminal portion (terminal block), and there are no particular limitations on the number and position of these terminal portions. For example, one housing 15 may be provided with one terminal portion or multiple (e.g., three) terminal portions. The terminal portion may also be located, for example, in the lower half of the rear surface of the housing 15. The above-described measuring section 12 and relay section 14 are built into one such housing 15.

[0049] <Test> In the test of the present invention, a test configuration 1 for measuring the ratio error and a test configuration 2 for measuring the phase angle are created for the current sensor measuring device 10 (particularly the coil material 1) described above and used for the test. First, we will explain the two test configurations in detail.

[0050] <Test Configuration 1> As shown in Figures 4(a) and 5, in test configuration 1, for coil material 1 (primary to secondary current transformation ratio is 1500:1) which is the current sensor part 11 of one current sensor measuring device 10, the test equipment used for test configuration 1 was a voltage 4-phase current 4-phase protective relay tester ("RX4744" manufactured by NF Corporation) X1 which supplies a predetermined input current value (reference value) which is the AC current to be measured (frequency 50 Hz or 60 Hz) to the coil material 1 as a primary input, a digital power meter ("WT1600" manufactured by Yokogawa Measurement Co., Ltd.) X2, a digital multimeter ("DM2571" manufactured by NF Corporation) X3 which inputs the sensor current from the coil material 1, and a protective relay digital multi-relay (connected to the 0.1 A terminal of "DMR" manufactured by Daiichi Electronics Co., Ltd., corresponding to measurement part 12) X4. Furthermore, a 0.3 sq. electric wire is used for the coil circuit 1a from the l (lowercase L) terminal of the coil material 1 to the protective relay digital multi-relay X4, and the shield wire 3a (earth wire) from the shield part 3 of the coil material 1 is floating (not grounded).

[0051] <Test Configuration 2> As shown in Figures 4(b) and 5, in test configuration 1, a phase meter (DPF-30N manufactured by Keihin Densouki Co., Ltd.) X5 was connected instead of the digital power meter X3 between the primary input from the digital power meter X2 and the coil material 1, and between the k terminal of the coil material 1 and the protective relay digital multi-relay X4. This was used as test configuration 2.

[0052] <Test> In the test, measurements are made to see whether the presence or absence of the above-mentioned enclosed portion 4 and cushion portion 5 affects the ratio error and the phase angle. 5(a) to 5(c), in the case of measuring the ratio error, for the coil material 1 of the above-described test configuration 1, when the primary input is between 500 A and 20 A, the primary input wire X0 is wound 30 turns (30T) around the coil material 1, and 16.67 A to 0.667 A is input to the coil material 1 from one primary input wire X0. When the primary input is less than 20 A, the primary input wire X0 is wound 1 turn (1T) around the coil material 1 and input to the coil material 1. The measurement results measured by the protective relay digital multi-relay X4 (i.e., measuring section 12) are shown in Table 1 and FIGS. 6 to 8 below. Note that the unit on the horizontal axis in FIGS. 6 to 8 is "AT," but this is because the overall primary input when the primary input is between 500 A and 20 A is 16.67 A to 0.667 A x 30T, and so the unit is "AT." Furthermore, the primary input wire X0 can be said to be a predetermined electrical path S, and this also applies to the measurement of the next phase angle. 5(a) to 5(c), in the case of measuring the phase angle, for the coil material 1 of the above-mentioned test configuration 2, the primary input wire X0 was wound 30 turns (30 turns) around the coil material 1 when the primary input was between 400 A and 16 A, and 13.33 A to 0.533 A was primarily input to the coil material 1 from one primary input wire X0, and for primary inputs of 16 A or less, the primary input wire X0 was wound 1 turn (1 turn) around the coil material 1 and primary input was applied, and the results of measurements taken by the protective relay digital multi-relay X4 (i.e., measuring section 12) are shown in Table 1 and FIGS. 6 to 8 below. Note that in the case of measuring the phase angle, the unit of the horizontal axis in FIGS. 6 to 8 is "AT," just as in the case of measuring the ratio error. In addition, the primary input is monitored by the digital power meter X3 using the ranges of 20A, 10A, 5A, 2A, and 1A, and when measuring the phase angle, the measurement value by the protective relay digital multi-relay X4 when the secondary output is less than 1mA (i.e., the primary input is less than 1.5A) is a reference value. In addition, in Table 1 and FIGS. 6 to 8, the ratio error and phase angle are each measured twice (first and second times). Furthermore, in Table 1, the measured values ​​of the phase angle are indicated as "positive (+)" when they are leading, and in Figures 6 to 8, only the case where the frequency is 50 Hz is shown.

[0053] [Table 1]

[0054] <Test evaluation> First, from Table 1 and Figures 6(a) to 8(a), it can be seen that the coil material 1 is Whether there is an enclosed portion 4 and a cushion portion 5, Regardless of whether there is an encapsulation part 4 and no cushion part 5, or no encapsulation part 4 and no cushion part 5 (no shield part 3 either), the accuracy of 1PS (measurement error within 1%) is met up to a rated current of 30A (based on measurements, up to a rated current of 15A), and no significant difference in characteristics is observed, so measurement accuracy can be maintained regardless of whether there is an encapsulation part 4 or cushion part 5. Next, from Table 1 and Figures 6(b) to 8(b), it can be seen that the coil material 1 is basically Whether there is an enclosed portion 4 and a cushion portion 5, Regardless of whether there is an encapsulation part 4 and no cushion part 5, or no encapsulation part 4 and no cushion part 5 (no shield part 3 either), up to a rated current of 30A, the accuracy of 1PS (measurement error within 1%) is met, and it can be said that measurement accuracy can be maintained regardless of the presence or absence of an encapsulation part 4 or cushion part 5. Although the input of coil material 1 exceeds the accuracy of 1PS at 60Hz with 5% input, it can also be said to be a measurement error.

[0055] <Coil mounting system 50, coil material 1 in the system 50> As shown in Figures 1(b) and (c), the coil mounting system 50 is a system for mounting the above-mentioned coil material 1 (hereinafter also referred to as "the system 50"). The specified electrical circuit S, which is the object to be mounted in the system 50, is a three-wire conductor S' arranged in parallel. Furthermore, the approximately circular coil portion 2 of the coil material 1 in the system 50 has the above-mentioned shield portion 3 provided not only on the inner side of the winding (winding portion) 2b wound around the core 2a, but also on the outer side of the wound winding portion 2b. Such a coil material 1 is attached to at least two of the three conductors S' that make up a predetermined electrical path S, so that the conductors S' pass through the substantially circular coil portion 2 of the coil material 1. Furthermore, the "conductor S'" in the system 50 may be a long, approximately plate-shaped bus (also called a BUS) among the above-mentioned electrical circuits S, and its configuration may be made of copper, aluminum, etc., without being coated with an insulating material, etc.

[0056] The specific configuration of the system 50 and the three-wire conductor S' is not particularly limited, but for example, the coil material 1 (so-called encapsulated portion 4) has a length of the mounting portion 4A (for example, the above-mentioned extension length 4AL is 68 mm, etc.) such that the three-wire (R phase, S phase, T phase) conductor S' at a predetermined height from the mounting surface M of the mounting portion 4A passes through the approximately circular coil portion 2, and the inner diameter of the coil material 1 (encapsulated portion 4) is a value (for example, at least 18 mm, 20 mm, etc.) that is a predetermined distance or more from the conductor S' that passes through the approximately circular coil portion 2, and the outer diameter of the coil material 1 (encapsulated portion 4) is a value (for example, at least 22 mm, 25 mm, etc.) that is a predetermined distance or more from another conductor S' that does not pass through the approximately circular coil portion 2 (outside the approximately circular coil portion 2). Therefore, in the case where the cross-sectional shape of the conductor S' is approximately rectangular with a width of 60 mm and a thickness of 12 mm, the distance between the conductor S' and the mounting surface M is 100 mm, and the distance between adjacent conductors S' is 130 mm, the values ​​of the outer diameter 1D, inner diameter 1d, width 1w, and thickness 1H of the coil material 1 (enclosed portion 4) and the extension length 4AL of the mounting portion 4A are shown below as examples. As described above, the coil material 1 (enclosed portion 4) may have an outer diameter 1D of 160 mm, an inner diameter 1d of 100 mm, a width 1w of 30 mm, a thickness 1H of 55 mm, and an extension length 4AL of the mounting portion 4A of 68 mm, etc.

[0057] <Other> The present invention is not limited to the above-described embodiment. The individual components of the coil material 1, the current sensor measuring device 10, the coil mounting system 50, etc., or the overall structure, shape, dimensions, etc., can be modified as appropriate in accordance with the spirit of the present invention. The coil material 1 does not necessarily have to have the encapsulation portion 4 or the cushion portion 5. The substantially circular coil portion 2 of the coil material 1 (current sensor portion 11) may or may not be of the open-close type. Furthermore, if the approximately circular coil portion 2 is an open / close type, it can be attached to the above-mentioned specified electrical circuit S without opening the specified electrical circuit S, and can be easily retrofitted by opening and closing itself without having to open the specified electrical circuit S that is the target of measurement. The length of the coil electric circuit 1a is not particularly limited, but may be, for example, 100 cm to 500 cm, preferably 200 cm to 400 cm, and more preferably 250 cm to 350 cm (300 cm, 280 cm, 320 cm, etc.). The current sensor measuring device 10 may have a coil (for example, an auxiliary CT) in addition to the coil material 1. The current sensor measuring device 10 does not necessarily have to have the output section described above.

[0058] The rated range of the current measured by the coil material 1 and the current sensor measuring device 10 is set to 1 A or more and 1800 A or less in the above description. However, it can also be said that the minimum value in the rated range may be 1 / 50 to 1 / 150 (1 / 50, 1 / 60, 1 / 90, 1 / 120, 1 / 150, etc.) of the maximum value in the rated range. For example, the rated range may be 0.750 A or more and 50,000 A or less, or 1,000 A or more and 50,000 A or less. The rated range may be 0.000A or less, 2.000A or more and 180.000A or less, 1.500A or more and 180.000A or less, or other ranges such as 0.100A or more and 5.000A or less, 0.200A or more and 18.000A or less, 0.150A or more and 18.000A or less, 0.010A or more and 0.500A or less, 0.020A or more and 1.800A or less, or 0.015A or more and 1.800A or less. The electric circuits to which the coil material 1 (current sensor portion 11) can be attached include not only the above-mentioned main electric circuits, branch electric circuits, and electric circuits on the secondary side of the instrument current transformer (output from the instrument current transformer), but also electric circuits in power generation systems such as grid interconnection panels, power generation connection panels, distribution panels, solar power generation systems, and any electric circuits within each power plant. [Industrial Applicability]

[0059] The coil material, current sensor measuring device, and coil mounting system of the present invention can be used in solar power generation systems and the like, regardless of the amount of power generated or their scale, and can be used as an ammeter, etc., in systems other than solar power generation systems that generate power using generators (AC motors, etc.) rotated by wind, water, wave, geothermal, etc., regardless of the magnitude of the current value in the electrical circuit being measured.In addition, they can be used in system interconnection panels such as distribution boards, power selling boards, power receiving boards, and power purchasing boards, as well as extra-high voltage boards (extra-high voltage equipment), high voltage boards (high voltage equipment), low voltage boards (low voltage equipment), monitoring boards (monitoring equipment), control boards (control equipment), substations (transformation equipment), equipment for buildings and condominiums, and all power plants that do not generate power, such as lighting distribution boards, and can be used both indoors and outdoors. [Explanation of symbols]

[0060] 1. Coil material 2. Nearly circular coil section 2a Core 2b winding 3 Shield section 4 Enclosure 5 Cushion part 6 Correction section 10 Current sensor measuring device 11 Current sensor part 12 Measurement section 50 Coil Mounting System S. Designated electrical circuit

Claims

1. A coil material attached to a predetermined electrical path, The coil material has a substantially circular coil portion (2), The substantially circular coil portion (2) has a substantially circular core (2a) and a winding (2b) wound around the core (2a), At least a conductive shield portion (3) is provided on the inner circumferential side of the wound winding (2b), The coil material is characterized in that the shield portion (3) is grounded.

2. The coil portion (2) is enclosed in an encapsulation portion (4) made of synthetic resin. The coil material according to claim 1, characterized in that a cushion portion (5) is provided between the encapsulating portion (4) and the approximately circular coil portion (2) and / or inside the approximately circular coil portion (2).

3. A current sensor measuring device comprising the coil material (1) according to claim 1 or 2, a current sensor portion (11) that outputs a sensor current corresponding to a current in the predetermined electrical path, and a measuring portion (12) that measures the current in the predetermined electrical path based on the sensor current output from the current sensor portion (11), A current sensor measuring device characterized in that the rated range of the current measured by the current sensor measuring device is 1 A or more and 1800 A or less.

4. 4. The current sensor measuring device according to claim 3, wherein the current sensor measuring device does not have any coil other than the coil material (1).

5. A coil mounting system comprising the coil material (1) according to claim 1 or 2, the predetermined electrical path is a three-wire conductor arranged in parallel, The substantially circular coil portion (2) of the coil material (1) is provided with the shield portion (3) not only on the inner circumferential side of the wound winding (2b) but also on the outer circumferential side of the wound winding (2b), A coil mounting system characterized in that the coil material (1) is attached to at least two of the three conductors so that the conductors pass through an approximately circular coil portion (2) of the coil material (1).

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