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JP-7856982-B2 - Coil material, current sensor measuring instrument, and coil mounting system

JP7856982B2JP 7856982 B2JP7856982 B2JP 7856982B2JP-7856982-B2

Inventors

  • 本家 正雄

Assignees

  • 株式会社力電

Dates

Publication Date
20260512
Application Date
20240528

Claims (4)

  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).

Description

This invention relates to a coil material that can be attached to a predetermined electrical circuit, a current sensor measuring device using the coil material, and a coil material mounting system. Conventionally, current transformers are known (see Patent Document 1). This current transformer comprises 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 the 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 the 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 exposed secondary terminal portion. Japanese Patent Publication No. 2006-344620 This diagram shows a coil material and coil mounting system according to the present invention, where (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. The dark colored area in (a) indicates the shielding area inside the encapsulation part and between it and the substantially circular coil part.This is a schematic diagram showing the current sensor measuring device (current sensor unit, measuring unit, etc.) according to the present invention.These are photographic representations of coil materials, where (a) shows a coil material with an encapsulation section (A on the left has a cushioning section, and B on the right does not), and (b) shows a coil material without an encapsulation section (black, without a cushioning section, shielding section, or shielding wire).This is a schematic diagram showing the test configurations for coil materials and current sensor measuring instruments, where (a) shows test configuration 1 for measuring ratio error, and (b) shows test configuration 2 for measuring phase angle.In a test to measure the ratio error and phase angle of coil material and current sensor measuring instrument, the following photographs serve as substitutes for diagrams showing how the primary input wire is wound around the coil material: (a) shows a coil material with an enclosed section and a cushioned section (A on the left in Figure 3(a)), (b) shows a coil material with an enclosed section but no cushioned section (B on the right in Figure 3(a)), and (c) shows a coil material without an enclosed section, no cushioned section, and no shielded section (black in Figure 3(b)).The graphs show the test results for a coil material with both an enclosed section and a cushioning section (A on the left in Figure 3(a)), where (a) shows the test results for the relative error and (b) shows the test results for the phase angle. Note that the horizontal axis of graphs (a) and (b) is logarithmic.The graphs show the test results for a coil material with an enclosed section but no cushioning section (B on the right in Figure 3(a)), where (a) shows the test results for the relative error and (b) shows the test results for the phase angle. The horizontal axis of graphs (a) and (b) is logarithmic.This graph summarizes the test results for coil materials with both an enclosed section and a cushioned section (A on the left in Figure 3(a)), coil materials with an enclosed section but no cushioned section (B on the right in Figure 3(a)), and coil materials without an enclosed section, no cushioned section, and no shielded section (black in Figure 3(b)). (a) shows the test results for relative error, and (b) shows the test results for phase angle. The horizontal axis of graphs (a) and (b) is logarithmic. Hereinafter, embodiments of the present invention will be described with reference to the drawings. <Overall structure of coil material 1> Figures 1 to 5 show the coil material 1 according to the present invention. This coil material 1 is a component that is attached to a predetermined electrical circuit S, and has a substantially circular coil portion 2 (described later) and a shield portion 3 (described later). The coil material 1 may have a encapsulation section 4 (described later) and a cushion section 5 (described later). In addition, the coil material 1 may have a coil circuit 1a, which will be described later, or it may have a coil housing that has a substantially circular coil section 2, a shield section 3, etc., inside, instead of the encapsulation section 4, which will be described later. In this invention, "electrical circuit S" refers to a device that carries electricity (current), and is a conductor such as copper, aluminum, silver, gold, or nichrome. The conductor may be covered with an insulating material, and includes general cables and wires. Furthermore, in the present invention, "attached to a predetermined electrical circuit S" includes cases where the electrical circ