Current transformers, instrument transformers, and gas-insulated switchgear

Abstract

The formation of the wiring pattern is facilitated while reducing noise and improving detection accuracy. The current transformer 60 includes a coil portion 62 formed on a laminated substrate 61, and the coil portion 62 includes a forward winding coil 70 and a reverse winding coil 80. The first conductive pattern 73 of the forward winding coil 70 includes a first inclined portion 732, which is inclined in a first direction Dc1 from the outer side of the radial direction Dr to the inner side of the laminated substrate 61, and the second conductive pattern 74 includes a second inclined portion 742, which is inclined in a second direction Dc2 from the outer side of the radial direction Dr to the inner side. The reverse winding coil 80 includes a third conductive pattern 82 extending in the circumferential direction Dc, and when viewed from the stacking direction Ds, the third conductive pattern 82 overlaps with the first inclined portion 732 and the second inclined portion 742.

Description

Technical Field

[0001] The present invention relates to a current transformer, an instrument transformer and a gas-insulated switchgear. Background Art

[0002] A gas insulated switchgear (GIS) has a structure in which a circuit breaker unit, a circuit breaker switch unit, an instrument transformer, and other devices are housed in a container sealed with insulating gas (see, for example, Patent Document 1). The instrument transformer of such a gas insulated switchgear has an instrument transformer for measuring high voltage. A capacitive voltage divider is sometimes used as such an instrument transformer.

[0003] The instrument transformer has a current transformer for measuring large currents. Sometimes a Rogowski coil is used as such a current transformer. The following form is known about the Rogowski coil: two windings in a mirror-image relationship are provided on a multilayer printed substrate, and the multilayer printed substrate has an opening in the center for a conductor to pass through (for example, refer to Patent Document 2). According to the description of Patent Document 2, two windings are formed by electrically connecting the substrate surface outside the printed substrate and the radially extending metal foil formed on the inner layer through the substrate. The two windings in a mirror-image relationship are connected in series to form a Rogowski coil.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2017-112661

[0007] Patent Document 2: Japanese Patent Application Publication No. 2003-130894 Summary of the invention

[0008] Technical issues to be solved by the invention

[0009] It is always desired to reduce noise and improve detection accuracy with respect to the Rogowski coil as described in Patent Document 2. In addition, when the substrate is stacked to form the coil as described in Patent Document 2, it is required to form a wiring pattern appropriately on the substrate.

[0010] An object of the present invention is to provide a current transformer, an instrument transformer, and a gas insulated switchgear capable of achieving reduction in noise, improvement in detection accuracy, and facilitation of formation of a wiring pattern.

[0011] Technical solutions for solving technical problems

[0012] The inverter of the present invention comprises: a circular stacked substrate, which is formed by stacking multiple conductive layers with insulating layers in between; and a coil portion, formed on the stacked substrate, wherein the stacked substrate comprises: a plurality of outer through electrodes, which are arranged at intervals along the circumferential direction on the outer periphery and electrically connected to the multiple conductive layers; and a plurality of inner through electrodes, which are arranged at intervals along the circumferential direction on the inner periphery and electrically connected to the multiple conductive layers, the coil portion comprises: a forward-winding coil, which is forward-winded in a first direction on the circumferential direction of the stacked substrate; and a reverse-winding coil, which is reverse-winded in a second direction on the circumferential direction, the forward-winding coil comprises: a plurality of first conductive patterns, which are arranged at intervals along the circumferential direction in the first conductive layer and connected to the outer through electrodes and the inner through electrodes; and a plurality of second conductive patterns, which are arranged at intervals along the circumferential direction in the second conductive layer. And connected to the outer through-electrode and the inner through-electrode, the first conductive pattern comprises: a first inclined portion, inclined in a first direction from the radial outer side to the inner side of the stacked substrate; and a first outer extension portion, connected to the outer through-electrode and the first inclined portion and extending in the radial direction, the second conductive pattern comprises: a second inclined portion, inclined in a second direction from the radial outer side to the inner side; and a second outer extension portion, connected to the outer through-electrode and the second inclined portion and extending in the radial direction, the reverse winding coil comprises a third conductive pattern, the third conductive pattern is arranged in a third conductive layer between the first conductive layer and the second conductive layer and extends in the circumferential direction, when viewed from the stacking direction of the stacked substrate, the first outer extension portion overlaps with the second outer extension portion, and when viewed from the stacking direction, the third conductive pattern overlaps with the first inclined portion and the second inclined portion.

[0013] In addition, when viewed from the radial direction, the outer through-electrode and the inner through-electrode may be arranged staggered in the circumferential direction. In addition, the first angle formed by the first outer extension portion and the first inclined portion and the second angle formed by the second outer extension portion and the second inclined portion may be the same angle. In addition, the first conductive pattern may include a first inner extension portion, and the second conductive pattern may include a second inner extension portion, wherein the first inner extension portion is connected to the inner through-electrode and the first inclined portion and extends radially, and the second inner extension portion is connected to the inner through-electrode and the second inclined portion and extends radially. In addition, when viewed from the stacking direction, the first inner extension portion and the second inner extension portion may overlap. In addition, the first inclined portion and the second inclined portion may also be arranged to be continuous in the circumferential direction when viewed from the stacking direction.

[0014] Furthermore, an instrument transformer according to an aspect of the present invention includes the current transformer according to the above aspect.

[0015] Furthermore, a gas insulated switchgear according to an aspect of the present invention includes the instrument transformer according to the above aspect.

[0016] Effects of the Invention

[0017] In the above-mentioned converter, since the first outer extension of the first conductive pattern constituting the forward winding coil overlaps with the second outer extension of the second conductive pattern when viewed from the stacking direction, the first inclined portion and the second inclined portion are arranged in a wavy or zigzag shape in the circumferential direction when viewed from the stacking direction, wherein the first inclined portion is inclined in the first direction in the circumferential direction from the first outer extension toward the radial inner side, and the second inclined portion is inclined in the second direction in the circumferential direction from the second outer extension toward the radial inner side. Since the third conductive pattern constituting the reverse winding coil overlaps with the first inclined portion and the second inclined portion when viewed from the stacking direction, the third conductive pattern is also continuous in a wavy or zigzag shape in the circumferential direction. Accordingly, the number of turns of the forward winding coil and the reverse winding coil in the circumferential direction can be increased within a limited space. In addition, the cross section of the forward winding coil perpendicular to the winding direction (helical direction) of the coil is offset by the cross section of the reverse winding coil, and the influence caused by the external magnetic field is suppressed, thereby being able to reduce noise and improve detection accuracy. In addition, for example, by making the inclination angle of the first inclined portion relative to the first direction and the inclination angle of the second inclined portion relative to the second direction an obtuse angle of about 135 degrees, the wavy bending portion of the third conductive pattern is about 90 degrees, and no acute angle portion is formed in the third conductive pattern, so that pattern formation becomes easy.

[0018] In addition, in a structure in which the outer through-electrode and the inner through-electrode are arranged staggered in the circumferential direction when viewed from the radial direction, the forward winding coil can be forwardly wound in the first direction in the circumferential direction of the laminated substrate by sequentially passing through the first conductive pattern having the first inclined portion, the inner through-electrode, the second conductive pattern having the second inclined portion, and the outer through-electrode. In addition, in a structure in which the first angle formed by the first outer extension portion and the first inclined portion and the second angle formed by the second outer extension portion and the second inclined portion are the same angle, the third conductive pattern overlapping the first inclined portion and the second inclined portion can be formed into a shape in which a symmetrical pattern is repeated in the circumferential direction.

[0019] In addition, in a structure in which the first conductive pattern has a first inner extension and the second conductive pattern has a second inner extension, the first inclined portion and the second inclined portion are located in the middle of the outer through-electrode and the inner through-electrode in the radial direction. Accordingly, the third conductive pattern can be arranged in the middle of the outer through-electrode and the inner through-electrode in the radial direction. In addition, in a structure in which the first inner extension overlaps with the second inner extension when viewed from the stacking direction, the radial inner end of the first inclined portion overlaps with the radial inner end of the second inclined portion when viewed from the stacking direction. Accordingly, it is possible to suppress the situation in which the third conductive pattern is formed in a staggered manner with the radial inner end of the first inclined portion and the radial inner end of the second inclined portion. In addition, the number of turns of the positive winding coil in the circumferential direction can be increased. In addition, in a structure in which the first inclined portion and the second inclined portion are set to be continuous in the circumferential direction when viewed from the stacking direction, the third conductive pattern overlapping with the first inclined portion and the second inclined portion can be formed into a wavy or sawtooth shape that is continuous in the circumferential direction.

[0020] Furthermore, according to the instrument transformer of the above aspect, since the above current transformer is provided, it is possible to reduce noise and improve detection accuracy when detecting the current flowing through the primary conductor.

[0021] Furthermore, according to the gas insulated switchgear of the above aspect, since the instrument transformer with reduced noise and improved detection accuracy is provided, a high-performance gas insulated switchgear can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an external view showing an example of a gas insulated switchgear according to an embodiment.

[0023] Figure 2 This is an external view showing an example of an instrument transformer.

[0024] Figure 3 This is a cross-sectional view showing an example of the internal structure of an instrument transformer.

[0025] Figure 4 It is a cross-sectional view showing an example of the structure of the converter.

[0026] Figure 5 A diagram showing an example of the structure of the first conductive pattern of the current transformer.

[0027] Figure 6 A diagram showing an example of the structure of the third conductive pattern of the current transformer.

[0028] Figure 7 A diagram showing an example of the structure of the second conductive pattern of the current transformer.

[0029] Figure 8It is a perspective view showing a partial structure of the forward winding coil and the reverse winding coil of the converter.

[0030] Fig. 9 A diagram showing an example of the first conductive pattern.

[0031] Fig.10 A diagram showing an example of the second conductive pattern.

[0032] Fig.11 A diagram showing an example of the third conductive pattern.

[0033] Fig.12 A diagram showing the relationship between the first conductive pattern and the second conductive pattern of the forward-winding coil and the third conductive pattern of the reverse-winding coil.

[0034] Fig.13 This is a diagram showing an enlarged portion of a forward-winding coil.

[0035] Reference numerals

[0036] 1: gas insulated switchgear; 50: instrument transformer; 55: capacitor voltage divider; 60: current transformer; 61: laminated substrate; 61a: outer periphery; 61b: inner periphery; 63: substrate; 62: coil; 64: conductive layer; 64A: first conductive layer (conductive layer); 64C: third conductive layer (conductive layer); 64D: second conductive layer (conductive layer); 65: insulating layer; 70: positive winding coil; 71, 71F, 71H, 71S: outer through-electrodes; 72, 72E: inner through-electrodes Pole; 73, 73F, 73H: 1st conductive pattern; 731: 1st outer extension; 732: 1st inclined portion; 733: 1st inner extension; 74: 2nd conductive pattern; 741: 2nd outer extension; 742: 2nd inclined portion; 743: 2nd inner extension; 80: reverse coil; 82: 3rd conductive pattern; Dc: circumferential direction; Dc1: 1st direction; Dc2: 2nd direction; Dr: radial direction; Ds: stacking direction; θ: angle; θ1: 1st angle; θ2: 2nd angle. DETAILED DESCRIPTION

[0037] The following describes the embodiments of the present invention with reference to the accompanying drawings. However, the present invention is not limited to the contents described below. In addition, in order to illustrate the embodiments, a portion of the drawings may be enlarged or emphasized to record and the scale may be changed as appropriate, and the size and shape may be different from the actual product. Figure 1 1 is a diagram showing an example of a gas insulated switchgear 1 according to an embodiment. The gas insulated switchgear 1 according to this embodiment is installed in a substation, etc. The gas insulated switchgear 1 according to this embodiment is installed in a high voltage three-phase AC power system such as 24 kV to 1100 kV.

[0038] like Figure 1 As shown, the gas insulated switchgear 1 includes a circuit breaker unit 2, a first circuit breaker switch unit 3A, a second circuit breaker switch unit 3B, and a power receiving side unit 5. The circuit breaker unit 2 includes a circuit breaker tank 21 and a circuit breaker (not shown) accommodated in the circuit breaker tank 21. The first circuit breaker switch unit 3A and the second circuit breaker switch unit 3B are arranged on one side of the circuit breaker unit 2. The first circuit breaker switch unit 3A and the second circuit breaker switch unit 3B each include a circuit breaker switch tank 31 connected to the circuit breaker tank 21 and a busbar circuit breaker (not shown) provided in the circuit breaker switch tank 31. The first circuit breaker switch unit 3A and the second circuit breaker switch unit 3B are connected to the first busbar and the second busbar (not shown), respectively.

[0039] The power receiving side unit 5 is arranged on the other side of the circuit breaker unit 2. Figure 1 to Figure 3 As shown in FIG. 5 , the power receiving side unit 5 includes a tank 51 and an instrument transformer 50. The tank 51 is formed into a cylindrical shape extending in the axial direction Da along the central axis 51c. Figure 1 As shown, one end 51a of the tank 51 is connected to the circuit breaker tank 21. The other end 51b of the tank 51 is connected to the power receiving side. Figure 3 As shown, an instrument transformer 50 is provided for each of the three phases in the tank 51 , and a total of three sets of instrument transformers 50 are provided. The three sets of instrument transformers 50 are arranged at intervals in the circumferential direction Dc around the central axis 51 c of the tank 51 .

[0040] Each instrument variable 50 is provided on the outer peripheral side of the primary conductor 52 extending along the axial direction Da in the tank 51, and is electrically connected to the tank 51 via the mounting plate 100. Each instrument variable 50 includes a capacitive voltage divider 55 and a current transformer 60. In the present embodiment, the capacitive voltage divider 55 and the current transformer 60 are symmetrically arranged in the axial direction Da of each instrument variable 50. That is, each instrument variable 50 includes two sets of capacitive voltage dividers 55 and the current transformer 60 along the axial direction Da. Each instrument variable 50 includes two capacitive voltage dividers 55 in the central part of the axial direction Da. Each instrument variable 50 includes a current transformer 60 on both sides of the axial direction Da for the two capacitive voltage dividers 55. In addition, in the present embodiment, each instrument variable 50 includes two sets of capacitive voltage dividers 55 and the current transformer 60, but is not limited thereto. It is also possible to include only one set of capacitive voltage divider 55 and the current transformer 60 for each instrument variable 50.

[0041] Each capacitive voltage divider 55 divides the high voltage flowing through the primary conductor 52. The capacitive voltage divider 55 divides the voltage according to the ratio of the electrostatic capacitance between the primary conductor 52 and the space electrode (not shown) to the electrostatic capacitance between the space electrode and the ground electrode. The current transformer 60 is arranged on the radial Dr outer side of the primary conductor 52 before and after the capacitive voltage divider 55. The current transformer 60 is used as a detection coil for detecting the current value of the high voltage flowing through the primary conductor 52. The current transformer 60 is connected to a signal processing device not shown. The signal processing device detects the current value flowing through the primary conductor based on the signal waveform output from the current transformer 60. In addition, in the present embodiment, the current transformer 60 is arranged on the radial Dr outer side of the primary conductor 52, but the setting position can be changed as appropriate. For example, the current transformer 60 can also be arranged on the radial Dr outer side of the capacitive voltage divider 55.

[0042] like Figures 4 to 7 As shown in FIG. 1 , the converter 60 includes a laminated substrate 61 and a coil portion 62. The laminated substrate 61 is annular and has an opening 61h in the center. The laminated substrate 61 is a plate having a predetermined thickness in the axial direction Da. Figure 4 As shown, the laminated substrate 61 includes a plurality of conductive layers 64 laminated on both sides of a substrate 63. In this embodiment, for example, four conductive layers 64A to 64D are laminated in the axial direction Da (hereinafter, the direction in which the plurality of conductive layers 64 are laminated is referred to as the lamination direction Ds). The plurality of conductive layers 64A to 64D are laminated with the substrate 63 as an insulating layer sandwiched therebetween and with the insulating layer 65 interposed therebetween. The conductive layers 64A to 64D are formed of a conductive material, and are each formed with a conductive pattern, an electrode, etc., which will be described later, by photolithography or the like.

[0043] like Figures 4 to 11 As shown, the stacked substrate 61 includes a plurality of outer through electrodes 71 and a plurality of inner through electrodes 72. The outer through electrodes 71 and the inner through electrodes 72 each electrically connect the plurality of conductive layers 64A to 64D. The outer through electrodes 71 and the inner through electrodes 72 each extend along the stacking direction Ds and penetrate the plurality of conductive layers 64A to 64D, the substrate 63 and the insulating layer 65, and are formed in, for example, a cylindrical shape.

[0044] The plurality of outer through electrodes 71 are arranged at intervals along the circumferential direction Dc on the outer peripheral portion 61a of the laminate substrate 61. The plurality of outer through electrodes 71 are arranged at equal intervals along the circumferential direction Dc on concentric circles centered on the central axis 61c of the laminate substrate 61. The outer through electrodes 71 adjacent to each other in the circumferential direction Dc are arranged such that the angle θ is centered on the central axis 61c.

[0045] The plurality of inner through electrodes 72 are arranged at intervals along the circumferential direction Dc on the inner peripheral portion 61b of the laminate substrate 61. The plurality of inner through electrodes 72 are arranged at equal intervals along the circumferential direction Dc. Fig.12As shown, the inner through electrodes 72 adjacent to each other in the circumferential direction Dc are arranged at an angle θ in the circumferential direction Dc. The outer through electrodes 71 and the inner through electrodes 72 are arranged to be offset in the circumferential direction Dc when viewed from the radial direction Dr. The plurality of inner through electrodes 72 are arranged in a manner to be offset by an angle θ / 2 relative to the plurality of outer through electrodes 71 in the circumferential direction Dc. That is, when viewed from the stacking direction Ds, the following state is achieved: the imaginary line in the radial direction Dr passing through the inner through electrode 72 does not coincide with the imaginary line in the radial direction Dr passing through the outer through electrode 71, but passes between the two outer through electrodes 71 (near the center).

[0046] like Figures 4 to 12 As shown, the coil portion 62 includes a forward winding coil 70 and a reverse winding coil 80. The forward winding coil 70 is forwardly wound in a first direction Dc1 of the circumferential direction Dc of the laminate substrate 61. The reverse winding coil 80 is reversely wound in a second direction Dc2 of the circumferential direction Dc.

[0047] The forward winding coil 70 includes a plurality of first conductive patterns 73, a plurality of second conductive patterns 74, a plurality of outer through electrodes 71 provided on the stacked substrate 61, and a plurality of inner through electrodes 72 provided on the stacked substrate 61. The plurality of first conductive patterns 73 are provided on the conductive layer 64 located at one end in the stacking direction Ds (axial direction Da) of the plurality of conductive layers 64. In the present embodiment, the plurality of first conductive patterns 73 are provided on the first conductive layer 64A located at one end in the stacking direction Ds of the plurality of conductive layers 64. The plurality of first conductive patterns 73 are provided at intervals in the first conductive layer 64A along the circumferential direction Dc. Both ends of each first conductive pattern 73 are connected to the outer through electrode 71 and the inner through electrode 72.

[0048] like Figure 8 , Fig. 9 , Fig.12 As shown, the first conductive pattern 73 includes a first outer extension portion 731, a first inclined portion 732, and a first inner extension portion 733. One end of the first outer extension portion 731 is connected to the outer through-electrode 71. The first outer extension portion 731 extends from the outer through-electrode 71 to the inner side in the radial direction Dr. The other end of the first outer extension portion 731 is connected to the first inclined portion 732. The first outer extension portion 731 is connected to the outer through-electrode 71 and the first inclined portion 732. The first inclined portion 732 is provided on the inner side in the radial direction Dr relative to the first outer extension portion 731. The first inclined portion 732 extends obliquely in the first direction Dc1 of the circumferential direction Dc from the outer side in the radial direction Dr to the inner side. The other end of the first inclined portion 732 is connected to one end of the first inner extension portion 733. The first inner extension portion 733 extends from the other end of the first inclined portion 732 to the inner side in the radial direction Dr. The other end of the first inner extension portion 733 is connected to the inner penetration electrode 72 . The first inner extension portion 733 is connected to the first inclined portion 732 and the inner penetration electrode 72 .

[0049] like Figure 4 As shown, the plurality of second conductive patterns 74 are provided on the conductive layer 64 located at the other end in the stacking direction Ds (axial direction Da) of the plurality of conductive layers 64. In the present embodiment, the plurality of second conductive patterns 74 are provided on the second conductive layer 64D located at the other end in the stacking direction Ds of the plurality of conductive layers 64. The plurality of second conductive patterns 74 are provided at intervals in the second conductive layer 64D along the circumferential direction Dc. Figure 8 , Fig.10 , Fig.12 As shown, both ends of each second conductive pattern 74 are connected to the outer through-electrode 71 and the inner through-electrode 72 .

[0050] The second conductive pattern 74 includes a second outer extension portion 741, a second inclined portion 742, and a second inner extension portion 743. One end of the second outer extension portion 741 is connected to the outer through-electrode 71. The second outer extension portion 741 extends from the outer through-electrode 71 to the inner side in the radial direction Dr. The other end of the second outer extension portion 741 is connected to the second inclined portion 742. The second outer extension portion 741 is connected to the outer through-electrode 71 and the second inclined portion 742. The second inclined portion 742 is provided on the inner side in the radial direction Dr relative to the second outer extension portion 741. The second inclined portion 742 extends obliquely in the second direction Dc2 of the circumferential direction Dc from the outer side in the radial direction Dr to the inner side. The other end of the second inclined portion 742 is connected to one end of the second inner extension portion 743. The second inner extension portion 743 extends from the other end of the second inclined portion 742 to the inner side in the radial direction Dr. The other end of the second inner extension portion 743 is connected to the inner through-electrode 72 . The second inner extension portion 743 is connected to the second inclined portion 742 and the inner through-electrode 72 .

[0051] like Figure 8 , Fig.12 As shown in FIG. 1 , the first outer extension portion 731 of the first conductive pattern 73 connected to each outer through-electrode 71 and the second outer extension portion 741 of the second conductive pattern 74 extend in the radial direction Dr. That is, when viewed from the stacking direction Ds, the first outer extension portion 731 of the first conductive pattern 73 connected to each outer through-electrode 71 overlaps with the second outer extension portion 741 of the second conductive pattern 74. In addition, the first inner extension portion 733 of the first conductive pattern 73 connected to each inner through-electrode 72 and the second inner extension portion 743 of the second conductive pattern 74 extend in the radial direction Dr. That is, when viewed from the stacking direction Ds, the first inner extension portion 733 of the first conductive pattern 73 connected to each inner through-electrode 72 overlaps with the second inner extension portion 743 of the second conductive pattern 74.

[0052] The first inclined portion 732 of the first conductive pattern 73 and the second inclined portion 742 of the second conductive pattern 74 coincide in position in the radial direction Dr. Since the first outer extension portion 731 and the second outer extension portion 741 overlap when viewed from the stacking direction Ds, the connecting portion J11 and the connecting portion J12 overlap when viewed from the stacking direction Ds, wherein the connecting portion J11 is the connecting portion between the end portion of the first inclined portion 732 on the outer side of the radial direction Dr and the first outer extension portion 731, and the connecting portion J12 is the connecting portion between the end portion of the second inclined portion 742 on the outer side of the radial direction Dr and the second outer extension portion 741. When viewed from the stacking direction Ds, the first inclined portion 732 and the second inclined portion 742 extend in a V-shape from the connecting portions J11 and J12 at the outer ends of the radial direction Dr with the first outer extension portion 731 and the second outer extension portion 741 toward the inner side of the radial direction Dr. Here, in the present embodiment, a first angle θ1 formed between the first outer extending portion 731 and the first inclined portion 732 and a second angle θ2 formed between the second outer extending portion 741 and the second inclined portion 742 are the same angle.

[0053] Since the first inner extension portion 733 overlaps with the second inner extension portion 743 when viewed from the stacking direction Ds, the connection portion J13 overlaps with the connection portion J14 when viewed from the stacking direction Ds, wherein the connection portion J13 is a connection portion between the end portion of the first inclined portion 732 on the inner side in the radial direction Dr and the first inner extension portion 733, and the connection portion J14 is a connection portion between the end portion of the second inclined portion 742 on the inner side in the radial direction Dr and the second inner extension portion 743. When viewed from the stacking direction Ds, the first inclined portion 732 and the second inclined portion 742 extend in a V-shape from the connection portions J13 and J14 at the inner side ends in the radial direction Dr with the first inner extension portion 733 and the second inner extension portion 743 toward the outer side in the radial direction Dr. Here, in the present embodiment, the third angle θ3 formed by the first inner extension portion 733 and the first inclined portion 732 is the same as the fourth angle θ4 formed by the second inner extension portion 743 and the second inclined portion 742. In this way, when viewed from the stacking direction Ds, the first inclined portion 732 and the second inclined portion 742 are provided to be continuous in a wavy and zigzag shape along the circumferential direction Dc.

[0054] In addition, if Fig.12 and Fig.13As shown, the first angle θ1 (the third angle θ3) and the second angle θ2 (the fourth angle θ4) are respectively set to obtuse angles. For example, the first angle θ1 and the second angle θ2 are set to, for example, 91 to 135 degrees. By setting the first angle θ1 and the second angle θ2 to approximately 135 degrees, when viewed from the stacking direction Ds, the angles formed by the first inclined portion 732 and the second inclined portion 742 are respectively approximately 90 degrees, thereby avoiding the situation where the wavy curved portion becomes an acute angle. In addition, by setting the first angle θ1 and the second angle θ2 to approximately 135 degrees, it is possible to prevent one first conductive pattern 73 or the second conductive pattern 74 from becoming wider in the circumferential direction Dc. As a result, a large number of first conductive patterns 73 or second conductive patterns 74 can be formed in the circumferential direction Dc, and the number of turns of the positive winding coil 70 can be increased within a limited space.

[0055] like Figure 8 , Fig. 9 As shown, regarding the forward winding coil 70, the outer through electrode 71S disposed at the winding start position is connected to a connection terminal 77, and the connection terminal 77 is connected to an external input terminal. The forward winding coil 70 is a spiral coil that is forwardly wound in the first direction Dc1 of the circumferential direction Dc by sequentially passing through the first conductive pattern 73, the inner through electrode 72, the second conductive pattern 74, and the outer through electrode 71. The forward winding coil 70 is connected to the reverse winding coil 80 via the inner through electrode 72E disposed at the winding end position.

[0056] like Figure 4 , Figure 8 As shown, the reverse coil 80 is disposed on the conductive layer 64 between the first conductive layer 64A and the second conductive layer 64D. In this embodiment, the reverse coil 80 is disposed on the third conductive layer 64C between the first conductive layer 64A and the second conductive layer 64D. The reverse coil 80 may also be disposed on the conductive layer 64B between the first conductive layer 64A and the second conductive layer 64D. Figure 8 , Fig.11 As shown, the reverse coil 80 includes a third inner extension portion 81 , a third conductive pattern 82 , and a third outer extension portion 83 .

[0057] One end of the third inner extension portion 81 is connected to the inner through electrode 72E disposed at the winding end position of the forward winding coil 70 in the third conductive layer 64C. The third inner extension portion 81 extends outward in the radial direction Dr from the inner through electrode 72E. The other end of the third inner extension portion 81 is connected to the starting end 82s of the third conductive pattern 82.

[0058] The third conductive pattern 82 extends from the starting end 82s to the end 82e along the second direction Dc2 of the circumferential direction Dc. Figure 8 , Fig.12As shown, when viewed from the stacking direction Ds, the third conductive pattern 82 overlaps with the first inclined portion 732 and the second inclined portion 742. The third conductive pattern 82 alternately includes the third inclined portion 813 and the fourth inclined portion 814 in the circumferential direction Dc, wherein the third inclined portion 813 overlaps with the first inclined portion 732 when viewed from the stacking direction Ds, and the fourth inclined portion 814 overlaps with the second inclined portion 742 when viewed from the stacking direction Ds. The position of the third conductive pattern 82 in the radial direction Dr coincides with the positions of the first inclined portion 732 and the second inclined portion 742 in the radial direction Dr.

[0059] When observed from the stacking direction Ds, the connection portion J31 overlaps with the connection portion J11 and the connection portion J12, wherein the connection portion J31 is the connection portion between the end portion of the third inclined portion 813 on the outer side of the radial direction Dr and the end portion of the fourth inclined portion 814 on the outer side of the radial direction Dr, the connection portion J11 is the connection portion between the end portion of the first inclined portion 732 on the outer side of the radial direction Dr and the first outer extension portion 731, and the connection portion J12 is the connection portion between the end portion of the second inclined portion 742 on the outer side of the radial direction Dr and the second outer extension portion 741. When viewed from the stacking direction Ds, the joint portion J32 overlaps with the connection portion J13 and the connection portion J14. The joint portion J32 is a joint between the end of the third inclined portion 813 on the inner side of the radial Dr and the end of the fourth inclined portion 814 on the inner side of the radial Dr. The connection portion J13 is a connection between the end of the first inclined portion 732 on the inner side of the radial Dr and the first inner extension portion 733. The connection portion J14 is a connection between the end of the second inclined portion 742 on the inner side of the radial Dr and the second inner extension portion 743.

[0060] like Figure 8 , Fig.11 As shown, one end of the third outer extension portion 83 is connected to the end 82e of the third conductive pattern 82. The third outer extension portion 83 extends outward in the radial direction Dr. In the third conductive layer 64C, the other end of the third outer extension portion 83 is connected to the outer through electrode 71F arranged at the winding end position of the reverse winding coil 80. In the first conductive layer 64A, the outer through electrode 71F is connected to the connection terminal 78 for connecting the external output terminal. The reverse winding coil 80 is a planar coil reversely wound from the inner through electrode 72E arranged at the winding end position of the forward winding coil 70 through the third conductive pattern 82 toward the second direction Dc2 of the circumferential direction Dc.

[0061] Here, if Figure 8As shown, when viewed from the stacking direction Ds, the first conductive pattern 73F of the winding coil 70 where the first outer extension portion 731 overlaps the third outer extension portion 83 is connected to the outer through electrode 71S arranged in a manner to avoid interference with the outer through electrode 71F via the bent portion 79. In addition, the outer through electrode 71H connected to the other first conductive pattern 73H adjacent to the first conductive pattern 73F is arranged on the inner side of the radial direction Dr to avoid interference with the outer through electrode 71S and the bent portion 79.

[0062] As described above, according to the converter 60, the instrument transformer 50, and the gas insulated switchgear 1 of the present embodiment, since the first outer extension portion 731 of the first conductive pattern 73 constituting the positive winding coil 70 overlaps with the second outer extension portion 741 of the second conductive pattern 74 when viewed from the stacking direction Ds, the first inclined portion 732 and the second inclined portion 742 are arranged in a wavy or serrated manner along the circumferential direction Dc when viewed from the stacking direction Ds, wherein the first inclined portion 732 is inclined from the first outer extension portion 731 toward the inner side of the radial direction Dr in the first direction Dc1 of the circumferential direction Dc, and the second inclined portion 742 is inclined from the second outer extension portion 741 toward the inner side of the radial direction Dr in the second direction Dc2 of the circumferential direction Dc.

[0063] Since the third conductive pattern 82 constituting the reverse winding coil 80 overlaps with the first inclined portion 732 and the second inclined portion 742 when viewed from the stacking direction Ds, the third conductive pattern 82 is continuous in a wavy or zigzag shape along the circumferential direction Dc. In addition, the first angle θ1 and the second angle θ2 are set to obtuse angles of 91 to 135 degrees, thereby avoiding the formation of an acute angle portion in the third conductive pattern 82. That is, when forming the pattern, the acute angle portion is easily missing, and the possibility of producing a defective reverse winding coil 80 increases. Therefore, although close attention is required when forming the third conductive pattern 82, by improving it in the above manner, there is no acute angle portion in the third conductive pattern 82, so the third conductive pattern 82 can be easily formed. In addition, the cross section perpendicular to the coil winding direction (helical direction) in the forward winding coil 70 is offset by the cross section of the reverse winding coil 80, and its influence is suppressed. As a result, it is possible to reduce noise and improve detection accuracy.

[0064] In addition, in the structure in which the outer through electrode 71 and the inner through electrode 72 are staggered in the circumferential direction Dc when viewed from the radial direction Dr, the positive winding coil 70 can be wound in the first direction Dc1 of the circumferential direction Dc of the stacked substrate 61 by sequentially passing through the first conductive pattern 73 having the first inclined portion 732, the inner through electrode 72, the second conductive pattern 74 having the second inclined portion 742, and the outer through electrode 71, thereby using a simple structure.

[0065] In addition, in a structure where the first angle θ1 formed by the first outer extension portion 731 and the first inclined portion 732 and the second angle θ2 formed by the second outer extension portion 741 and the second inclined portion 742 are the same angle, the third conductive pattern 82 overlapping the first inclined portion 732 and the second inclined portion 742 can be formed into a shape that repeats a symmetrical pattern in the circumferential direction Dc. As described above, by setting the first angle θ1 and the second angle θ2 to an obtuse angle in the range of 91 degrees to 135 degrees, the curved portion of the third conductive pattern 82 can be an obtuse angle of 90 degrees or more. As a result, there is no acute angle portion in the third conductive pattern 82, and the third conductive pattern 82 can be appropriately formed.

[0066] In addition, in the structure in which the first conductive pattern 73 includes the first inner extension portion 733 and the second conductive pattern 74 includes the second inner extension portion 743, the first inclined portion 732 and the second inclined portion 742 are located in the middle of the outer through electrode 71 and the inner through electrode 72 in the radial direction Dr. Accordingly, the third conductive pattern 82 can be arranged in the middle of the outer through electrode 71 and the inner through electrode 72 in the radial direction Dr.

[0067] In addition, in the structure where the first inner extension portion 733 overlaps with the second inner extension portion 743 when viewed from the stacking direction Ds, the end of the first inclined portion 732 on the inner side in the radial direction Dr overlaps with the end of the second inclined portion 742 on the inner side in the radial direction Dr when viewed from the stacking direction Ds. Accordingly, it is possible to suppress the portion of the third conductive pattern 82 that overlaps with the end of the first inclined portion 732 on the inner side in the radial direction Dr and the end of the second inclined portion 742 on the inner side in the radial direction Dr from extending longer in the circumferential direction Dc. Therefore, the number of turns of the forward winding coil 70 and the reverse winding coil 80 in the circumferential direction Dc can be increased.

[0068] In addition, in a structure in which the first inclined portion 732 and the second inclined portion 742 are arranged to be continuous in the circumferential direction Dc when viewed from the stacking direction Ds, the third conductive pattern 82 overlapping the first inclined portion 732 and the second inclined portion 742 can be formed into a wavy or sawtooth shape that is continuous in the circumferential direction Dc.

[0069] The above embodiment is described, but the technical scope of the present invention is not limited to the scope described in the above embodiment. Sometimes one or more elements described in the above embodiment can be omitted. In addition, the elements described in the above embodiment can be combined as appropriate. In addition, various changes or improvements can be made to the above embodiment, which is obvious to those skilled in the art. Such a form with changes or improvements is also included in the technical scope of the present invention. For example, in the above embodiment, a plurality of converters 60 can be arranged along the axial direction Da.

Claims

1. A converter for a gas insulated switchgear, the converter comprising: The annular laminated substrate is formed by laminating a plurality of conductive layers with insulating layers interposed therebetween; and A coil portion is formed on the laminate substrate, in, The laminated substrate comprises: a plurality of outer through electrodes, which are arranged at intervals in the circumferential direction at the outer periphery and electrically connect the plurality of conductive layers; and A plurality of inner through electrodes are provided at intervals along the circumferential direction on the inner periphery and electrically connect the plurality of conductive layers. The coil portion comprises: The forward-winding coil is forwardly wound toward the first direction in the circumferential direction; and The reverse winding coil is reversely wound toward a second direction in the circumferential direction which is opposite to the first direction. The positive winding coil has: a plurality of first conductive patterns provided at intervals along the circumferential direction on the first conductive layer and connected to the outer through-electrode and the inner through-electrode; and a plurality of second conductive patterns, which are arranged in the second conductive layer at intervals along the circumferential direction and connected to the outer through-electrode and the inner through-electrode, The first conductive pattern comprises: a first inclined portion that is inclined in the first direction from the radially outer side to the radially inner side of the stacked substrate; and a first outer extending portion connected to the outer through-electrode and the first inclined portion and extending in the radial direction, The second conductive pattern comprises: a second inclined portion that inclines in the second direction from the outer side in the radial direction toward the inner side; and a second outer extending portion connected to the outer through-electrode and the second inclined portion and extending in the radial direction, The reverse coil includes a third conductive pattern, which is provided in a third conductive layer between the first conductive layer and the second conductive layer and extends in the circumferential direction. The outer through-electrode is arranged on the circumference of the first radius, The inner through electrode is arranged on the circumference of the second radius, The outer through-electrode and the inner through-electrode are disposed at positions offset from each other in the circumferential direction so as not to overlap each other on the same line extending in the radial direction. When viewed from the stacking direction of the stacked substrate, the first outer extending portion overlaps with the second outer extending portion. When viewed from the stacking direction, the third conductive pattern overlaps the first inclined portion and the second inclined portion, and an angle formed by a pattern overlapping the first inclined portion and a pattern overlapping the second inclined portion is greater than 90 degrees.

2. The converter according to claim 1, wherein: A first angle formed by the first outer extending portion and the first inclined portion and a second angle formed by the second outer extending portion and the second inclined portion are the same angle.

3. The converter according to claim 1 or 2, wherein: The first conductive pattern includes a first inner extending portion connected to the inner through electrode and the first inclined portion and extending in the radial direction. The second conductive pattern includes a second inner extending portion connected to the inner through electrode and the second inclined portion and extending in the radial direction.

4. The converter according to claim 3, wherein: When viewed from the stacking direction, the first inner extending portion overlaps with the second inner extending portion.

5. The converter according to claim 1 or 2, wherein: The first inclined portion and the second inclined portion are provided so as to be continuous in the circumferential direction when viewed from the stacking direction. 6 . An instrument transformer comprising the current transformer according to claim 1 .

7. A gas insulated switchgear comprising the instrument transformer according to claim 6.

Images