Coil material, current sensor measuring instrument, 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 to be attached to a predetermined circuit, a current sensor measuring device using the coil material, and a coil attachment system.

Background Art

[0002] Conventionally, a current transformer has been known (see Patent Document 1). This current transformer includes a 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 core and the secondary coil, a secondary terminal that penetrates a part of the insulating body and is connected to the secondary coil, a secondary terminal exposed portion that is an end of the secondary terminal and is exposed from the insulating body, and a gap between a grounding fitting attached to the insulating body and the secondary terminal exposed portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, as shown in claim 2, FIG. 2, etc. of Patent Document 1, although the secondary coil of the current transformer is grounded via a secondary terminal exposed portion, a grounding fitting, etc., there is a problem that it is affected by electrical influences such as electrostatic induction and electromagnetic induction from the primary conductor.

[0005] In view of such points, an object of the present invention is to provide a coil material, a current sensor measuring device, and a coil attachment system that achieve "reduction of electrical influence" from a predetermined circuit by grounding a conductive shield portion provided at least on the inner peripheral side of a substantially circular core winding.

Means for Solving the Problems

[0006] The coil material 1 according to the present invention is a coil material to be attached to a predetermined electrical circuit, the coil material having 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, at least a conductive shield portion 3 is provided on the inner circumference side of the wound winding 2b, the shield portion 3 is grounded, the material of the winding 2b is at least one of nichrome wire, polyurethane copper wire, polyester copper wire and polyamide-imide copper wire, and the shield Department 3 is a single tape-like object, and the shield portion 3 is equipped with a shield wire 3a that is electrically connected to the shield portion 3, and the shield wire 3a is electrically connected to only one end of the shield portion 3 which is the single tape-like object, and the shield portion 3 is grounded when the shield wire 3a is grounded. The shield portion 3 has an enclosed portion 4 in which the substantially circular coil portion 2 is sealed with synthetic resin, and the grounding terminal of the shield wire 3a is disposed on the bottom surface of the terminal recess 4b in the enclosed portion 4, and the shield portion 3 is grounded via the shield wire 3a and the grounding terminal disposed on the bottom surface of the terminal recess 4b in the enclosed portion 4, and the only thing grounded in the enclosed portion 4 is the grounding terminal disposed on the bottom surface of the terminal recess 4b. Its first characteristic is this.

[0008] The current sensor measuring device 10 according to the present invention comprises a current sensor section 11 equipped with the above-described coil material 1 and outputting a sensor current corresponding to the current in the predetermined circuit, and a measuring section 12 that measures the current in the predetermined circuit based on the sensor current output from the current sensor section 11, wherein the rated range of the current measured by the current sensor measuring device is 1A or more and 1800A or less. Furthermore, the measurement unit 12 does not measure the zero-sequence current, and the current sensor measuring device does not have any coils other than the coil material 1. This is its first characteristic.

[0009] A second feature of the current sensor measuring device 10 according to the present invention is, in addition to the first feature described above, The predetermined circuit is the main circuit from the grid through the grid connection panel to the load in a power plant, and / or the branch circuit to the power generation equipment. The current sensor measuring device has a relay unit 14 that performs a relay operation according to the current value in the predetermined circuit measured by the measuring unit 12. "According to the current value in the predetermined circuit measured by the measuring unit 12" means when the current value exceeds a threshold or falls below a threshold. The relay operation performed by the relay unit 14 is, if the power generation equipment in the power plant has a power conditioner that converts DC current or AC current to AC current, the operation to stop the conversion of the power conditioner. It's at a single point.

[0010] The coil mounting system 50 according to the present invention is a coil mounting system comprising the coil material 1 described above, wherein the predetermined circuit is a 3-wire conductor arranged in parallel, and the substantially circular coil portion 2 of the coil material 1 has the shield portion 3 provided not only on the inner circumference side of the wound winding 2b but also on the outer circumference side of the wound winding 2b, and at least two of the three conductors eachThe first feature is that the coil material 1 is installed such that the conductor passes through the substantially circular coil portion 2 of the coil material 1.

[0011] These features allow for grounding of the conductive shield portion 3 provided on the inner circumference side of the substantially circular core 2a and winding 2b, thereby reducing electrical influences such as electrostatic induction and electromagnetic induction from a predetermined circuit S (such as the main circuit described later) to which the coil material 1 is attached, unlike in Patent Document 1 ("reduction of electrical influences"). As a result, it can be said that measurement errors in the current sensor measuring device 10 described later, which uses coil material 1, can be reduced ("reduction of measurement errors").

[0012] Furthermore, by having an enclosed section 4 in which the roughly circular coil section 2 is sealed with synthetic resin, and a cushion section 5 between the enclosed section 4 and the roughly circular coil section 2, and inside the roughly circular coil section 2, the durability of the coil material 1 can be improved. At the same time, as shown in Figure 3, the presence of the enclosed section 4 and the cushion section 5 does not affect the measurement accuracy of the current sensor measuring instrument 10 using the coil material 1, and its accuracy can be maintained (achieving both "improved durability" and "maintaining measurement accuracy").

[0013] Furthermore, by setting the rated range of the measurement current in the current sensor measuring device 10, which has a current sensor section 11 equipped with a coil material 1 and a measurement section 12, to 1A or more and 1800A or less, once the coil material 1 is attached to a predetermined circuit S such as a main circuit, the current sensor measuring device 10 alone can measure the current flowing through the predetermined circuit S even if the current value flowing through the predetermined circuit S changes significantly. Furthermore, this current sensor measuring device 10 can also be described as a "super wide-area compatible current sensor measuring device." Conversely, if it were not such a "super wide-area compatible current sensor measuring device," every time the current value flowing through a predetermined circuit S changes significantly, it would be necessary to open the predetermined circuit S, such as the main circuit through which high-voltage current flows, or to disconnect grid-connected equipment, load devices, and power generation equipment connected to the main circuit, etc. Opening or disconnecting these would require completely shutting down the main circuit, grid-connected equipment, load devices, and power generation equipment. During the shutdown period, the use of load devices and power generation by power generation equipment would be impossible (due to the shutdown of factories, businesses, and power generation), resulting in very large losses. Therefore, losses can be reduced by using such a "super wide-area compatible current sensor measuring device."

[0014] Furthermore, by eliminating coils other than coil material 1, errors caused by electromagnetic induction in unnecessary coils can be eliminated, leading to a further reduction in measurement errors.

[0015] Furthermore, by attaching the coil material 1 to at least two of the three conductors of a predetermined electrical circuit S such that the conductors pass through a substantially circular coil section 2, which has shielding sections 3 on both its inner and outer circumferences, it becomes possible to reduce the electrical influence from the two conductors other than those passing through the substantially circular coil section 2, while also enabling the coil material 1 to be attached as close as possible to the three conductors, thereby achieving space savings in the mounting area. [Effects of the Invention]

[0016] According to the coil material, current sensor measuring instrument, and coil mounting system of the present invention, by grounding a conductive shield portion provided at least on the inner circumference side of a substantially circular core winding, it is possible to achieve "reduction of electrical influence" from a predetermined electrical circuit. [Brief explanation of the drawing]

[0017] [Figure 1]The schematic diagrams showing the coil material and the coil mounting system according to the present invention, where (a) is a perspective view showing the outline of the coil material, (b) is a front view showing the outline of the coil mounting system, and (c) is a side view showing the outline of the coil mounting system. In (a), the darker-colored part indicates the shield part inside the encapsulation part and between the substantially circular coil part. [Figure 2] The schematic diagram showing the current sensor measuring device (such as a current sensor part, a measuring part, etc.) according to the present invention. [Figure 3] The drawing substitute photograph exemplifying the coil material, where (a) shows the coil material with an encapsulation part (furthermore, A on the left has a cushion part and B on the right has no cushion part), and (b) shows the coil material without an encapsulation part (black, without a cushion part, and without a shield part and shield wire). [[ID=...]] [Figure 4] The schematic diagrams showing the test configurations of the coil material and the current sensor measuring device, where (a) shows Test Configuration 1 for measuring the ratio error, and (b) shows Test Configuration 2 for measuring the phase angle. [Figure 5] The drawing substitute photograph showing the winding method of the wire for the primary input with respect to the coil material in the test for measuring the ratio error and phase angle of the coil material and the current sensor measuring device, where (a) shows the coil material with an encapsulation part and a cushion part (A on the left in Fig. 3(a)), (b) shows the coil material with an encapsulation part and without a cushion part (B on the right in Fig. 3(a)), and (c) shows the coil material without an encapsulation part, without a cushion part, and without a shield part (the black part in Fig. 3(b)). [Figure 6] The graph showing the test results of the coil material with an encapsulation part and a cushion part (A on the left in Fig. 3(a)), where (a) shows the test results of the ratio error and (b) shows the test results of the phase angle. In the graphs of (a) and (b), the horizontal axis is in logarithmic scale. <00...087><00...088>The graph showing the test results of the coil material with an encapsulation part and without a cushion part (B on the right in Fig. 3(a)), where (a) shows the test results of the ratio error and (b) shows the test results of the phase angle. In the graphs of (a) and (b), the horizontal axis is in logarithmic scale. [Figure 8]A graph summarizing the test results of a coil material with an encapsulation part and a cushion part (the left A in Fig. 3(a)), a coil material with an encapsulation part but no cushion part (the right B in Fig. 3(a)), and a coil material without an encapsulation part, cushion part, or shield part (the black one in Fig. 3(b)). (a) shows the test results of the ratio error, and (b) shows the test results of the phase angle. Note that the horizontal axis of the graphs in (a) and (b) is in logarithmic scale.

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. <Overall Configuration of Coil Material 1> In FIGS. 1 to 5, a coil material 1 according to the present invention is shown. This coil material 1 is a member to be attached to a predetermined electric circuit S, and has a substantially circular coil portion 2 and a shield portion 3 to be described later. The coil material 1 may have an encapsulation part 4 and a cushion part 5 to be described later. In addition, the coil material 1 may have a coil electric circuit 1a to be described later, or may have a coil housing that provides a substantially circular coil portion 2, a shield portion 3, etc. inside instead of the encapsulation part 4 to be described later.

[0019] Note that the "electric circuit S" in the present invention is a conductor that conducts electricity (current), such as copper, aluminum, silver, gold, nichrome, etc., and the conductor may be covered with a coating such as an insulator, and includes general cables and electric wires. Furthermore, in the present invention, "attached to a predetermined electrical circuit S" includes cases where the electrical circuit S is attached so as to pass through the substantially circular coil portion 2 of the coil material 1, or cases where the coil material 1 is attached to at least two of the three parallel-arranged conductors S' or cables, etc., which constitute the predetermined electrical circuit S, so as to pass through the substantially circular coil portion 2 of the coil material 1, and also includes cases where the coil material 1 is attached to at least one of the two or four or more parallel-arranged conductors S' or cables, etc., which constitute the predetermined electrical circuit S, so as to pass through the substantially circular coil portion 2 of the coil material 1. Furthermore, in this invention, "the electrical circuit S is installed so as to pass through the substantially circular coil portion 2 of the coil material 1" means that the electrical circuit S is installed so as to pass through a hole located approximately in the center of the substantially circular coil portion 2 of the coil material 1, or conversely, it can 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 shield part 3, encapsulation part 4, and cushion part 5 described later) are not particularly limited, but 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 (such as 159.60 mm or 160.00 mm). Similarly, 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 (such as 97.20 mm, 97.80 mm, or 100.00 mm). 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 there are no particular limitations on this value, but its upper limit may be, for example, 45 mm or less, preferably 40 mm or less, and even more preferably 35 mm or less, and its lower limit may be, for example, 15 mm or more, preferably 20 mm or more, and even more preferably 20 mm or more (30.00 mm, etc.), and it can be said that a thinner width 1w is preferable. There are no particular limitations on the thickness 1H of the coil material 1, but its upper limit may be, for example, 70 mm or less, preferably 60 mm or less, and more preferably 50 mm or less, and its lower limit may be, for example, 10 mm or more, preferably 20 mm or more, and more preferably 30 mm or more (such as 38.80 mm, 38.95 mm, 55.00 mm, etc.). Furthermore, the lower limits 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. Furthermore, the cross-sectional shape of the approximately circular coil portion 2 may be, for example, approximately rectangular (approximately rectangular or approximately square), or it may also be approximately circular, approximately elliptical, or approximately triangular.

[0021] <Slightly circular coil section 2> As shown in Figures 1-5, the approximately circular coil portion 2 is a coil member that is approximately circular (approximately ring-shaped or approximately annular) in plan view, and it can also be said that the approximately circular coil portion 2 is approximately circular in shape. To elaborate on the plan view shape of the roughly circular coil section 2, it may be strictly circular in plan view, or it may be slightly elliptical in plan view. The roughly circular coil section 2 comprises a core 2a (described later) and a winding 2b (described later). The width 2w and thickness 2H of the roughly circular coil section 2 (including the core 2a and winding 2b described later) are not particularly limited, but 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, and the lower limit may be, for example, 5 mm or more, preferably 10 mm or more, and more preferably 15 mm or more (19 mm, etc.). Similarly, the upper limit of the thickness 2H of the roughly circular coil section 2 may be, for example, 45 mm or less, preferably 40 mm or less, and more preferably 35 mm or less, and the lower limit may be, for example, 15 mm or more, preferably 20 mm or more, and more preferably 20 mm or more (29 mm, etc.). Note that these lower limits of the width 2w and thickness 2H of the roughly circular coil section 2 may be combined with any of the upper limits. In addition, the roughly circular coil section 2 may include a coil bobbin around which the winding wire 2b is wound and attached to the core 2a.

[0022] <Core 2a> As shown in Figures 1-5 (especially Figure 1(c)), the core 2a can also be described as an iron core member (magnetic core member), and the shape of the core 2a is approximately circular in plan view (that is, overall, it is approximately cylindrical or ring-shaped). More specifically, it may be strictly circular in plan view, or slightly elliptical in plan view. There may be only one core 2a per substantially circular coil section 2, or there may be multiple cores 2a. If there are multiple cores 2a, the substantially circular coil section 2 may be equipped with a fixing device for securing the multiple cores 2a together. The material of core 2a may be silicon steel such as grain-oriented silicon steel or ultrathin silicon steel, electrical steel, dust materials such as iron dust, Sendust, or Permalloy, ferrite, amorphous materials, or Finemet (registered trademark). The core 2a may be formed by laminating multiple thin plates, in which case the lamination of the multiple thin plates may be bonded together with an adhesive or the like. In addition, a coating (film) for rust prevention or insulation may be formed on the surface of the core 2a.

[0023] <Winding 2b> As shown in Figures 1-5 (especially Figure 1(c)), the winding 2b is an electrical circuit wound around the core 2a as described above, and can also be described as the part that covers the core 2a (winding portion 2b). Winding 2b can also be considered an electric wire, and its material can be any material or wire type that can conduct electricity, such as polyurethane copper wire (UEW), polyester copper wire (PEW), polyamide-imide copper wire (AIW), nichrome wire, silver, gold, aluminum, etc. Furthermore, the diameter of the winding wire 2b is not particularly limited, but it may be 0.1 mm or more and 10.0 mm or less, preferably 0.2 mm or more and 5.0 mm or less, and even more preferably 0.3 mm or more and 1.0 mm or less (such as 0.6 mm). There are no particular limitations on the number of turns (windings) of such a winding 2b, 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 (such as 750 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 of the lower limits for the winding 2b may be combined with any of the upper limits.

[0024] Furthermore, if multiple windings 2b are provided around the core 2a of a single approximately circular coil section 2, the number of turns of each winding 2b may be the same or different. Furthermore, with respect to the number of turns of the winding 2b relative to the core 2a (if there is one wound winding 2b, this is the number of turns of that winding 2b; if there are multiple wound windings 2b, this is the total number of turns of those multiple windings 2b), the predetermined circuit S being measured can be said to have 1 turn. Therefore, the current transformation ratio between the primary side (the predetermined circuit S side) and the secondary side (the output from the coil material 1 (coil circuit 1a) side) of the coil material 1 is the number of turns of the winding 2b in the approximately circular coil section 2 relative to the number of turns in the predetermined circuit S (i.e., 1: number of turns of the winding 2b in the approximately circular coil section 2).

[0025] When winding this winding 2b, you may use a winding machine such as a spindle winding machine, a flyer winding machine, or a tracing winding machine, or you may wind it by hand; any method is acceptable. Furthermore, when using a winding machine to perform aligned winding, it is necessary to apply some tension to winding 2b to keep it taut in order to achieve neat aligned winding. Therefore, you may temporarily secure the beginning and end of winding 2b with tape or wrap it around the aforementioned retaining pin. From the windings 2b wound in this manner, one end and the other end (so to speak, the beginning and end of the winding) of each winding 2b may protrude as lead wires, etc., and the ends of each winding may be connected to each other or to each other (or one end and the other end) with screws or the like to connect (make electrical) two wound windings 2b in series. Alternatively, the windings 2b wound around the core 2a a predetermined number of times may be covered with a cushion part 5 described later, and the windings 2b may be wound again on top of the cushion part 5 (that is, the cushion part 5 may be sandwiched between the windings 2b). Each of the two wound wires 2b connected in series may have a connecting terminal, such as a round or open-ended type, at the end that is not connected to the other, and these connecting terminals may be color-coded, for example, red and blue.

[0026] <Coil Circuit 1a> As shown in Figures 1-5, the coil circuit 1a is a circuit that outputs the current (sensor current) output from the approximately circular coil section 2, and may be two wires (k, l (lowercase L), secondary wire) connected to one end and the other end (so to speak, the beginning and end of the winding) of the winding 2b described above. The coil circuit 1a may also be connected to the measurement section 12, which will be described later, via a variable resistor (varistor). Furthermore, the coil 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 have to be particularly limited, but it is related to the primary and secondary current transformation ratio of the coil material 1 as described above (that is, the number of turns of the winding as the entire approximately circular coil section 2 (if there is one wound winding 2b, it is the number of turns of that winding, and if there are multiple wound windings 2b, it is the total number of turns of the multiple windings 2b)), and may be, for example, 1A or less.

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

[0028] <Shield section 3> As shown in Figures 1 to 5 (especially Figure 1(c)), the shield portion 3 is conductive and is provided at least on the inner circumference side of the winding 2b wound around the core 2a in the substantially circular coil portion 2 described above, and this shield portion 3 is grounded. Furthermore, in the present invention, "the shield portion 3 is provided at least on the inner circumference side of the winding 2b wound around the core 2a in the substantially circular coil portion 2" includes not only the case where the shield portion 3 is provided on the inner circumference side of the winding 2b wound around the core 2a in the substantially circular coil portion 2, but also the case where the shield portion 3 is provided on the outer circumference side of the winding 2b wound around the core 2a in the substantially circular coil portion 2, or the case where the shield portion 3 is provided on the outer circumference side, upper side and / or lower side of the winding 2b wound around the core 2a in the substantially circular coil portion 2. Furthermore, in this invention, "inner circumference side," "outer circumference side," "upper side," and "lower side" refer to the inner circumference side, outer circumference side, upper side, and lower side if the cross-sectional shape of the substantially circular coil portion 2 is angular (e.g., substantially rectangular), and the inner circumference portion, outer circumference portion, upper portion, and lower portion if the cross-sectional shape of the substantially circular coil portion 2 is rounded (e.g., substantially circular or substantially elliptical).

[0029] The specific configuration of the shield section 3 is not particularly limited, but for example, a copper tape may be placed between the substantially circular coil section 2 (winding (winding section) 2b wound so as to cover the core 2a) and the encapsulation section 4 or cushion section 5 described later, and the copper tape may cover the inner circumference of the winding section 2b. The shape of the shield section 3 is also not particularly limited, but for example, if it is a tape-like material as described above, the inner circumference of the winding section 2b may be wound along the inward direction, or the outer circumference may be wound along the outward direction, or the upper or lower side may be covered with multiple pieces of tape-like material. In addition, the shield section 3 may be layered or a braided strand, etc. The material of the conductive shield portion 3 may be a metal such as copper, aluminum, tin, or tin-plated soft copper, or it may be a conductive polymer.

[0030] Furthermore, the conductive shield portion 3 may be equipped with a shield wire 3a that is electrically connected to the shield portion 3, and the shield portion 3 may be grounded by grounding this shield wire 3a. There are no particular limitations on the specific configuration of the shield wire 3a. For example, if the winding section 2b is covered with multiple copper tapes on the inner circumference and other sides (outer circumference, top, bottom), it is acceptable for the wire (ground, secondary wire) to be connected to any one of the multiple copper tapes, as long as each copper tape is in contact with the others and conducts electricity. In addition, if the shield section 3 is covered on both the inner and outer circumferences with a single copper tape, the shield wire 3a may be connected to only one end of the shield section 3. In this case, the shield wire 3a is grounded, resulting in one-end grounding of the shield section 3. Furthermore, the shield wire 3a may be present at both ends of the shield section 3 when the inner and outer circumferences are covered on each end with a single copper tape. In this case, the shield wire 3a is grounded, resulting in both-end grounding of the shield section 3.

[0031] <Enclosed section 4> As shown in Figures 1-5, the encapsulation section 4 is the part in which the above-mentioned approximately circular coil section 2 is encapsulated in synthetic resin, and can also be described as a molded section. The encapsulation section 4 may also be equipped with a mounting section 4A, which will be described later, and can also be described as a coil housing. The synthetic resin material for the encapsulation section 4 is not particularly limited, but may be epoxy (EP) resin, silicone (Si) resin, polyurethane (PU) resin, etc. These synthetic resins are poured around the approximately circular coil section 2 and the approximately circular coil section 2 and the shield section 3 and allowed to harden. Such a sealing section 4 improves the protection, electrical insulation, heat resistance, and environmental resistance of the approximately circular coil section 2 and shield section 3, and also improves reliability and lifespan by protecting the approximately circular coil section 2 and shield section 3 from external environmental influences and damage. Furthermore, when enclosing the roughly circular coil section 2 and the shield section 3 with synthetic resin (which can also be called molding), vacuum degassing may be performed to prevent air bubbles from forming in the synthetic resin, and this vacuum degassing can be said to make the synthetic resin more uniform.

[0032] The shape of the encapsulation part 4 is not particularly limited, but for example it may be roughly cylindrical (so to speak, like wound-up masking tape), roughly annular, or roughly ring-shaped. Even if the surface of the roughly circular coil part 2 or shield part 3 has some irregularities or rounded corners, the encapsulation part 4 after encapsulation may have a uniform curved surface (side surface) on the inner and outer sides, and the upper and lower sides may be flat. In addition, the shape of the encapsulation portion 4 may include one or more grooves 4a formed on its upper or lower side (or front or rear side) substantially along the circumferential direction (for example, the groove 4a at the top of Figures 1(b) and (c) has a depth of 7 mm, and the groove 4a at the bottom of Figures 1(b) and (c) has a depth of 5 mm), and the encapsulation portion 4 from the bottom of the groove 4a to the encapsulated substantially circular coil portion 2 has a predetermined thickness (for example, 6 mm). Furthermore, the thickness from the inner circumference of the sealing portion 4 to the inner circumference of the substantially circular coil portion 2 sealed inside may be thicker than the thickness from the outer circumference of the sealing portion 4 to the outer circumference of the substantially circular coil portion 2 sealed inside (for example, the thickness of the inner sealing portion 4 may be 6 mm or more, and the thickness of the outer sealing portion 4 may be 4 mm or more), and may be approximately the same or, conversely, thinner.

[0033] <Mounting portion 4A of the sealing part 4> As shown in Figures 1(b) and (c), the mounting portion 4A of the sealing portion 4 extends outward from a part of the outer circumference of the main body of the sealing portion 4. 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 (68 mm, etc.). Note that each of these lower limits of the extension length 4AL may be combined with any of the upper limits. Furthermore, the shape of the mounting portion 4A is not particularly limited, but for example, it may be a roughly rectangular parallelepiped or roughly cubic shape extending from the outer circumference of the encapsulation portion 4. In the following description, the shape of the mounting portion 4A will be assumed to be mainly a roughly rectangular parallelepiped. Mounting section 4A may have secondary terminals for the two wires (k, l) that make up the coil circuit 1a from the roughly circular coil section 2 (these secondary terminals can also be considered part of the coil circuit 1a), or grounding terminals such as the shield wire 3a (shield earth, E) of the shield section 3 (these grounding terminals can also be considered part of the shield wire 3a), or test terminals (kt, lt) may also be provided. The placement of these terminals is not particularly limited, but they may be placed on the bottom surfaces of the recesses (terminal recesses) 4b on both sides (upper and lower, or front and rear) of the lower part of the roughly rectangular mounting portion 4A. These terminal recesses 4b have a predetermined depth (e.g., 7 mm), width (e.g., 54 mm), and height (e.g., 18 mm), and the center of each terminal placed on its bottom surface is at a predetermined height (e.g., 19 mm) from the surface (mounting surface) M to which the mounting portion 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 screwing in fixing screws, etc.) 4c may be provided at multiple locations (for example, 4 locations) on the bottom surface (the surface on the mounting surface M side) of the substantially rectangular parallelepiped mounting portion 4A, and these 4 fixing means 4c are spaced at a predetermined depth (for example, 8 mm) and at predetermined left-right spacing (for example, 60 mm) and front-back spacing (for example, 32 mm). In addition, the mounting portion 4A may be provided with a recess (test winding recess) 4d that is roughly cross-shaped in plan view, extending vertically upward from the bottom surface of the roughly rectangular mounting portion 4A, for winding a winding (primary input winding) for testing purposes, and a protrusion (test winding protrusion) 4e that is gently raised vertically upward on the approximately opposite side of the test winding recess 4d in the vertical direction and on the inner circumference side of the roughly circular coil portion 2 (enclosure portion 4). In particular, since the test winding recess 4d is roughly cross-shaped, even when the mounting portion 4A is attached to the mounting surface M, openings of a predetermined width (e.g., 40 mm) remain on the upper and lower (or front and rear) sides of the mounting portion 4A, and openings of a predetermined width (e.g., 14 mm) remain on the left and right sides of the mounting portion 4A. As a result, the mounting portion 4A can be said to be fixed to the mounting surface M in a four-legged manner, 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 (especially Figure 1(c)), the cushion portion 5 is a cushioning member provided between the aforementioned encapsulation portion 4 and the substantially circular coil portion 2, or inside the substantially circular coil portion 2. The specific configuration of the cushion portion 5 is not particularly limited, but for example, the cushion portion 5 may be provided only between the inner circumference side of the winding portion 2b of the substantially circular coil portion 2 and the encasing portion 4 (the entire or a part of the circumferential direction of the substantially circular coil portion 2) (see Figure 1(c)), or the cushion portion 5 may be provided between the inner circumference side and outer circumference side of the winding portion 2b of the substantially circular coil portion 2 (the entire or a part of the circumferential direction of the substantially circular coil portion 2), or between at least one side (upper or lower) and the encasing portion 4. In addition, as described above, the cushion portion 5 may be provided inside the substantially circular coil portion 2 between the windings 2b, or between the core 2a and the windings 2b. The material of the cushion part 5 is not particularly limited, but it may be, for example, foamed synthetic resin such as polyurethane (PU) resin, polyethylene (PE) resin, polypropylene (PP) resin, or polystyrene (PS) resin, or it may also be rubber sheet, nonwoven fabric, woven fabric, knitted fabric, or other textile products. The following provides a detailed explanation of the current sensor measuring device 10 using the coil material 1 described above.

[0035] <Current Sensor Measuring Device 10> Figures 1 to 5 show the current sensor measuring device 10 according to the present invention. This current sensor measuring device 10 is a device for measuring the value of the current flowing through a predetermined circuit S, and has a current sensor part 11 and a measuring part 12, which will be described later. The current sensor measuring device 10 may have a measurement section 12 that includes a correction section 13 (described later), or it may also have a relay section 14 and a housing 15. The current sensor measuring device 10 may also have an output unit (not shown) that digitizes the output current from the current sensor unit 11 (described later) and outputs it to the measuring unit 12 (described later) or the control unit of the power plant via a wired connection such as a communication cable, or wirelessly. The current sensor measuring device 10 can have any value for the detection interval by the current sensor part 11 or the output interval (communication speed) of the output part described above. For example, the output interval may be 0.1 seconds or less, 0.05 seconds to 2.00 seconds, 0.75 seconds to 1.50 seconds, or 0.10 seconds to 1.00 seconds (such as 0.1 seconds).

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

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

[0038] Furthermore, if the current sensor part 11 is directly attached to the main circuit or the secondary circuit of an instrument current transformer, and the current sensor part 11 is attached to the secondary circuit of the main circuit, then as long as the current sensor part 11 can detect the current value of the main circuit, the voltage value (potential) of the main circuit will be the same potential as the grid (6600V, 22000V, 3300V, etc.). Therefore, the product of the current value of the main circuit detected by the current sensor part 11 and the voltage value of the main circuit is the power in the main circuit, which can be said to be the power sold to the grid (reverse power) or the power purchased from the grid (received power) detected by the current sensor part 11. This is also true when the current sensor part 11 is connected to the low-voltage side of a pole-mounted transformer (step-down transformer). As long as the current sensor part 11 can detect the current value on the low-voltage side of the pole-mounted transformer, the power will be approximately the same on both the high-voltage and low-voltage sides of the pole-mounted transformer (ignoring iron losses, copper losses, etc.). Therefore, the product of the current value on the low-voltage side of the pole-mounted transformer detected by the current sensor part 11 and the voltage value on the low-voltage side of the pole-mounted transformer can be said to be the power in the grid (power sold to the grid (reverse power) and power purchased to the grid (received power) detected by the current sensor part 11).

[0039] Such a current sensor component 11 may exist only once in a single current sensor measuring device 10, but it may also exist in multiple units. The current sensor section 11 can have any configuration as long as it can detect the current in a predetermined circuit S. For example, it can be a fluxgate type (open-loop or closed-loop type), a Hall element type (open-loop or closed-loop type), a CT (Current Transformer) type, or a Rogowski coil type. Furthermore, there are no particular limitations on the power supply for the current sensor measuring device 10, but it may be shared with the voltage of the circuit being measured as described above (i.e., 110V, 220V, 440V at 60Hz or 50Hz, or 100V to 200V), or it may be 100V or 110V DC. The current sensor part 11 is not particularly limited as long as it can detect current, but it may be electronic, mechanical, three-phase (a method that detects two phases out of three wires), or single-phase.

[0040] Furthermore, as described above with respect to the coil material 1, the current transformation ratio of the current sensor part 11 between the primary side (the predetermined circuit S side) and the secondary side (the output from the current sensor part 11 (coil circuit 1a) side) is not particularly limited, 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 or 15000:1, etc.). In other words, if the current transformation ratio between the primary and secondary sides of the current sensor section 11 is 1500:1, even if the current flowing through the circuit being measured is very large, for example, 1500A, the current output from the current sensor section 11 will be approximately 1A (1000mA). If the current transformation ratio between the primary and secondary sides of the current sensor section 11 is 15000:1, even if the current flowing through the circuit being measured is very large, for example, 1500A, the current output from the current sensor section 11 will be approximately 0.1A (100mA). Furthermore, there are no particular limitations on the detectable range of the current sensor portion 11, but it is as described above for the current sensor measuring device 10. Such a current sensor portion 11 can be installed at any position relative to the predetermined circuit S, as long as it can detect the current in the circuit S. For example, it may be installed in the main circuit as described above, or in other locations such as the low-voltage side of a pole-mounted transformer or the secondary side of a current transformer.

[0041] <Measurement section 12> As shown in Figures 2 and 4, the measurement unit 12 is a part that measures at least the value of the current in a predetermined circuit S based on the current output from the current sensor unit 11 via the coil circuit 1a. The measurement unit 12 may also include a correction unit 13, which will be described later. The measuring unit 12 may be built into the housing 15 (provided inside the housing 15). The measurement unit 12 is not particularly limited in its configuration, but for example, it may include an A / D converter, a CPU (central processing unit) that calculates and processes the value of the current output from the A / D-converted current sensor unit 11, memory, and an LCD (liquid crystal display), which will be described later. In addition, the measurement unit 12 may also include an auxiliary CT (auxiliary current transformer) between the current sensor unit 11 and the A / D converter or CPU. Furthermore, if the measurement section 12 is equipped with an auxiliary CT, there are no particular limitations on the current transformation ratio between the primary side (input from the current sensor section 11 (coil circuit 1a) side) and the secondary side (A / D converter side or CPU side) of the auxiliary CT. 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 or 20:1, etc.).

[0042] However, since coils are also present within the auxiliary CT, it can be said that the measurement section 12, equipped with the auxiliary CT, increases the errors caused by electromagnetic induction in the extra coils. Therefore, the current sensor measuring device 10 does not need to have any coils other than the coil material 1 mentioned above, including the coil in the auxiliary CT. In this case, errors caused by electromagnetic induction in the extra coils can be eliminated, and it can be said that further "reduction of measurement errors" can be achieved. In addition, the measuring unit 12 measures at least the value of the current in a predetermined circuit S. However, if the measuring unit 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 predetermined circuit S, or measure reactive power, power factor, energy, reactive energy, etc. In addition, the measurement unit 12 may also measure the frequency of the alternating current at a predetermined power level, or the zero-sequence current.

[0043] <Correction part 13> As shown in Figures 2, 6-8, the correction unit 13 is provided in the measurement unit 12 described above and corrects the value of the current in a predetermined circuit S measured by the measurement unit 12 based on the current output from the current sensor unit 11 described above. The correction unit 13 is not particularly limited in its correction, but for example, as described above in Figures 6-8, the value of the current output from the current sensor unit 11 (detected value) tends to be smaller than the reference value. Within the range in which this small value occurs, the measurement unit 12 may perform a correction to set the measured value to a value corresponding to the ratio error (such as the value obtained by multiplying the detected value by the reciprocal of the average value of the ratio error in Figures 6-8 (or the average value excluding exceptional cases)). Here, for the range in which the detected value from the current sensor part 11 is smaller than the reference value, for example, in Figures 6 to 8 above, the above-mentioned correction may be performed in all ranges other than 0% where the ratio error is 0%, or a correction may be performed in which the measurement part 12 measures a value corresponding to the ratio error only when the value is less than or equal to a predetermined value (for example, the input current value is 10 AT). Alternatively, the correction performed by the correction unit 13 may be a correction in which the value obtained by first-order scaling of the detected value is used as the value measured by the measurement unit 12. The correction unit 13 does not have any particular limitations in its configuration, but for example, the correction performed by the correction unit 13 may be calculated and processed by the CPU in the measurement unit 12 described above, and can therefore be considered software.

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

[0045] Furthermore, the specified time may be 0.1 seconds or more and 15.0 seconds or 0.2 seconds or more and 5.0 seconds or more, 0.5 seconds or more, or 3.0 seconds or more (such as 2.0 seconds) after the threshold is exceeded or fallen below the threshold (that is, if 2.0 seconds or so have elapsed after the threshold is exceeded, the relay operation described later may be performed). In addition, this specified time may be adjustable in 0.1-second steps (0.0 seconds, 0.1 seconds, 0.2 seconds...15.0 seconds) from 0.0 seconds to 15.0 seconds. Furthermore, in this invention, "relay operation" means, for example, in a power plant, an operation to interrupt the circuit from the power plant to the grid via a signal using one of the circuit breakers, or, if the power plant has a power conditioner (a power conditioner that converts DC current or AC current to AC current), stopping the conversion of said power conditioner. The signals from the relay section 14 may include, in addition to the "trip" signal (a signal to interrupt the circuit breaker) to the circuit breaker as described above, an "on" signal (a signal to turn the circuit breaker itself ON), an "off" signal (a signal to turn the circuit breaker itself OFF), and a signal to release the interruption of a predetermined circuit S. 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 relay section 14 is not particularly limited in its configuration, but may be a contact-type (electromagnetic) relay using an electromagnet, or a contactless relay using a semiconductor element. Furthermore, if it is an electromagnetic relay, it may be 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 (which switches the opening and closing of the contacts each time current is passed through the electromagnet), or any other type of polarized relay with a permanent magnet in parallel with the electromagnet. Such relay components 14 may exist as a single element in a single current sensor measuring device 10, or they may exist as multiple elements.

[0047] <Enclosure 15> As shown in Figure 2, the housing 15 is a housing that incorporates at least the measuring section 12. The housing 15 can be described as a measuring housing 15 if the coil material 1 has a measuring portion 12 but no relay portion 14, and can also be described as a measuring relay housing 15 if the coil material 1 has both a measuring 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 measurement unit 12, and this display unit may be provided with a backlight. The information displayed on the display unit may include not only the current value measured by the measurement unit 12, but also voltage, power, or numbers representing the mode or status. In addition, the housing 15 may have an operating section, and there are no particular limitations on the configuration, function, or position of this operating section, but for example, it may have multiple buttons.

[0048] The functions of the control panel may include, for example, a button to turn the display on and off (display button), a reset button to reset the coil material 1, buttons 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 operating unit may also be, for example, located on the front of the housing 15, below the display unit described above. The housing 15 may have terminal sections (terminal blocks), and there are no particular limitations on the number or position of these terminal sections. For example, one housing 15 may have one terminal section or multiple terminal sections (such as three). The terminal section may also be located, for example, in the lower half of the back of the housing 15. The aforementioned measurement unit 12 and relay unit 14 are built into this single housing 15.

[0049] <Exam> In the tests of the present invention, a test configuration 1 for measuring the ratio error and a test configuration 2 for measuring the phase angle are prepared and used for the current sensor measuring device 10 (particularly the coil material 1) described above. First, let's explain the two exam structures in detail.

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

[0051] <Test Structure 2> As shown in Figures 4(b) and 5, in Test Configuration 2, a phase meter (DPF-30N manufactured by Keihin Densokuki Co., Ltd.) X5 was connected in place 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, in Test Configuration 1.

[0052] <Exam> The test measures whether the presence or absence of the aforementioned sealing section 4 and cushion section 5 affects the ratio error and phase angle. In the case of measuring the ratio error, as shown in Figures 5(a) to (c), for the coil material 1 of the test configuration 1 described above, when the primary input is 500A to 20A, the primary input wire X0 is wound around the coil material 1 30 times (30 turns), and 16.67A to 0.667A is applied as a primary input from one primary input wire X0 to the coil material 1. When the primary input is less than 20A, the primary input wire X0 is wound around the coil material 1 1 time (1 turn), and the primary input is applied. The results of the measured values ​​measured by the protective relay digital multi-relay X4 (so to speak, the measurement part 12) are shown in Table 1 and Figures 6 to 8 below. Note that the unit on the horizontal axis in Figures 6 to 8 is "AT," because when the primary input is 500A to 20A, the total primary input is 16.67A to 0.667A × 30T, so the unit is "AT." Furthermore, the primary input wire X0 can be said to be, so to speak, a predetermined circuit S, and this is also true in the case of the next phase angle measurement. Furthermore, in the case of phase angle measurement, as shown in Figures 5(a) to (c), for coil material 1 of the test configuration 2 described above, when the primary input is 400A to 16A, the primary input wire X0 is wound around coil material 1 30 times (30 turns), and 13.33A to 0.533A is applied as a primary input to coil material 1 from one primary input wire X0. When the primary input is 16A or less, the primary input wire X0 is wound around coil material 1 1 time (1 turn) and applied as a primary input, and the results of the measured values ​​measured by the protective relay digital multi-relay X4 (so to speak, the measurement part 12) are shown in Table 1 and Figures 6 to 8 below. Note that, in the case of phase angle measurement as well, the unit on the horizontal axis in Figures 6 to 8 is "AT", just as in the case of ratio error measurement. In addition, the primary input is monitored using the digital power meter X3 in the ranges of 20A, 10A, 5A, 2A, and 1A. 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) should be considered a reference value. Furthermore, in Table 1 and Figures 6-8, the ratio error and phase angle were measured twice each (first and second times). Furthermore, in Table 1, the phase angle measurement values ​​are defined as "positive (+)" when leading, and Figures 6-8 show only the case where the frequency is 50 Hz.

[0053] [Table 1]

[0054] <Evaluation of the exam> First, regarding the measurement of the ratio error, coil material 1 is as follows: Does it have an enclosed section 4 and a cushioned section 5? Regardless of whether the sealed section 4 is present but the cushion section 5 is absent, or whether the sealed section 4 is absent and the cushion section 5 is absent (shield section 3 is also absent), the device meets the rating up to 30A (measured up to 15A), has an accuracy of 1PS (measurement error within 1%), and no significant differences in characteristics are observed. Therefore, regardless of the presence or absence of the sealed section 4 or cushion section 5, the measurement accuracy can be maintained. Next, as shown in Table 1 and Figures 6(b) to 8(b), the measurement of the phase angle is basically the same for coil material 1. Does it have an enclosed section 4 and a cushioned section 5? Regardless of whether there is a sealed section 4 and no cushion section 5, or whether there is neither a sealed section 4 nor a cushion section 5 (and no shield section 3), it can be said that it meets an accuracy of 1 PS (measurement error within 1%) up to a rating of 30A, and that measurement accuracy can be maintained regardless of the presence or absence of the sealed section 4 and cushion section 5. At 60Hz with an input of 5% in coil material 1, the accuracy exceeds 1PS, but this can also be considered a measurement error.

[0055] <Coil mounting system 50, coil material 1 in the system 50> As shown in Figures 1(b) and 1(c), the coil mounting system 50 is a system for mounting the coil material 1 described above (hereinafter also referred to as "the system 50"), and the predetermined circuit S to be mounted in the system 50 is a conductor S' consisting of three wires arranged in parallel. Furthermore, in the system 50, the substantially circular coil portion 2 of the coil material 1 is provided with the aforementioned shield portion 3 not only on the inner circumference side of the winding (winding portion) 2b wound around the core 2a, but also on the outer circumference 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 circuit S, such 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, roughly plate-shaped bus (also called a bus) among the aforementioned electrical circuits S, and its construction may be made of copper, aluminum, etc., without any insulating coating.

[0056] The specific configuration of the system 50 and the three conductors S' is not particularly limited, but for example, the coil material 1 (so to speak, the encapsulation part 4) has a length of mounting part 4A (for example, the extension length 4AL mentioned above is 68 mm) such that the three conductors S' (R phase, S phase, T phase) at a predetermined height from the mounting surface M of the mounting part 4A pass through the substantially circular coil part 2, and the inner diameter of the coil material 1 (encapsulation part 4) is a value that is greater than or equal to a predetermined distance from the conductors S' passing through the substantially circular coil part 2 (for example, a minimum of 18 mm, 20 mm, etc.), and the outer diameter of the coil material 1 (encapsulation part 4) is a value that is greater than or equal to a predetermined distance from another conductor S' that does not pass through the substantially circular coil part 2 (is outside the substantially circular coil part 2) (for example, a minimum of 22 mm, 25 mm, etc.). Therefore, for 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 (encasing part 4) and the extended length 4AL of the mounting part 4A are exemplified below. As described above, the coil material 1 (encasing 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 extended length 4AL of the mounting portion 4A of 68 mm, etc.

[0057] <Other> The present invention is not limited to the embodiments described above. The individual components of the coil material 1, the current sensor measuring device 10, the coil mounting system 50, etc., as well as 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 an encasing portion 4 or a cushion portion 5. The approximately circular coil portion 2 in the coil material 1 (current sensor portion 11) does not have to be of the open / close type, but it may or may not be of the open / close type. Furthermore, if the approximately circular coil section 2 is of the open / close type, it can be attached to the predetermined electrical circuit S described above without cleaving the predetermined electrical circuit S, and can be easily retrofitted by opening and closing itself without cleaving the predetermined electrical circuit S that is the target of measurement. The length of the coil circuit 1a is not particularly limited, but for example, it may be 100 cm or more and 500 cm or less, preferably 200 cm or more and 400 cm or less, and even more preferably 250 cm or more and 350 cm or less (such as 300 cm, 280 cm, or 320 cm). 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 unit described above.

[0058] As mentioned above, the rated range of the current measured by the coil material 1 and the current sensor measuring device 10 is stated to be 1A or more and 1800A or less. However, it can also be said that the minimum value within the rated range should be 1 / 50 to 1 / 150 of the maximum value within the rated range (e.g., 1 / 50, 1 / 60, 1 / 90, 1 / 120, 1 / 150, etc.). For example, the rated range could be 0.750A or more and 50.000A or 1.000A or more and 50 The rated range may be 0.000A or less, 2.000A to 180.000A, 1.500A to 180.000A, or other ranges such as 0.100A to 5.000A, 0.200A to 18.000A, 0.150A to 18.000A, 0.010A to 0.500A, 0.020A to 1.800A, 0.015A to 1.800A, etc. The coil material 1 (current sensor portion 11) can be attached not only to the main circuit, branch circuit, and secondary side of the current transformer (output from the current transformer) as described above, but also to any circuit within the grid connection panel, power generation connection panel, switchboard, power generation system such as a solar power generation system, and each power plant. [Industrial applicability]

[0059] The coil material, current sensor measuring instrument, and coil mounting system of the present invention can be used in solar power generation systems regardless of the amount or scale of power generation. In addition to solar power generation systems, they can be used as ammeters, etc., in systems that generate electricity using generators (AC motors, etc.) rotated by wind, hydro, wave, geothermal, etc., regardless of the magnitude of the current value in the circuit being measured. Furthermore, they can be used in grid connection panels such as distribution boards, power sales boards, power receiving boards, and power purchase boards, as well as extra-high voltage panels (extra-high voltage equipment), high voltage panels (high voltage equipment), low voltage panels (low voltage equipment), monitoring panels (monitoring equipment), control panels (control equipment), substations (substation equipment), equipment for buildings and condominiums, and all power plants that do not generate electricity, such as lighting distribution boards, and can be used both indoors and outdoors. [Explanation of Symbols]

[0060] 1. Coil material 2. Approximately circular coil section 2a core 2b winding 3 Shield section 4. Enclosure 5. Cushion part 6. Correction Unit 10 Current Sensor Measuring Instrument 11 Current sensor section 12 Measurement section 50 Coil Mounting System S Predetermined electrical circuit

Claims

1. A coil material to be attached to a predetermined electrical circuit, 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), A conductive shield portion (3) is provided on the inner circumference side of the wound wire (2b). The shield portion (3) is grounded, The material of the winding (2b) is at least one of nichrome wire, polyurethane copper wire, polyester copper wire, and polyamide-imide copper wire. The shield portion (3) is a single tape-like object, The shield portion (3) is provided with a shield wire (3a) that is electrically connected to the shield portion (3), The shield wire (3a) is electrically connected to only one end of the shield portion (3), which is a single tape-like object. When the shield wire (3a) is grounded, the shield portion (3) is grounded. The enclosed portion (4) is formed by enclosing the substantially circular coil portion (2) with synthetic resin. The grounding terminal of the shield wire (3a) is provided on the bottom surface of the terminal recess (4b) in the sealing portion (4). The shield portion (3) is grounded via the shield wire (3a) and the grounding terminal disposed on the bottom surface of the terminal recess (4b) in the encapsulation portion (4). The coil material is characterized in that the only element grounded in the enclosed portion (4) is the grounding terminal disposed on the bottom surface of the terminal recess (4b).

2. A current sensor measuring device comprising a current sensor portion (11) that includes a coil material (1) as described in claim 1 and outputs a sensor current corresponding to the current in the predetermined circuit, and a measuring portion (12) that measures the current in the predetermined circuit based on the sensor current output from the current sensor portion (11), The rated current range measured by this current sensor measuring device is 1A to 1800A. The measurement unit (12) does not measure the zero-sequence current. The current sensor measuring device is characterized in that it does not have any coils other than the coil material (1).

3. The aforementioned specified circuit is the main circuit in a power plant, from the grid through the grid connection panel to the load, and / or the branch circuit to the power generation equipment. The current sensor measuring device has a relay unit (14) that performs a relay operation according to the current value in the predetermined circuit measured by the measuring unit (12), The measurement unit (12) measures the current value in the predetermined circuit, and the current value is measured in such cases as when it exceeds a threshold or falls below a threshold. The current sensor measuring device according to claim 2, characterized in that the relay operation performed by the relay section (14) is an operation to stop the conversion of a power conditioner when the power generation device in the power plant has a power conditioner that converts DC current or AC current to AC current.

4. A coil mounting system comprising the coil material (1) described in claim 1, The aforementioned predetermined circuit consists of three conductors 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 circumference side of the wound winding (2b) but also on the outer circumference side of the wound winding (2b). A coil mounting system characterized in that, for each of the three conductors, the coil material (1) is attached such that at least two of the conductors pass through the substantially circular coil portion (2) of the coil material (1).

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