CN117716455A - Converter, meter-use transformer, and gas-insulated switchgear - Google Patents

Abstract

The formation of wiring patterns 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 1 st conductive pattern 73 of the positive coil 70 includes a 1 st inclined portion 732, the 1 st inclined portion 732 being inclined in the 1 st direction Dc1 from the outside to the inside in the radial direction Dr of the laminated substrate 61, and the 2 nd conductive pattern 74 includes a 2 nd inclined portion 742, the 2 nd inclined portion 742 being inclined in the 2 nd direction Dc2 from the outside to the inside in the radial direction Dr. The rewind coil 80 includes a 3 rd conductive pattern 82 extending in the circumferential direction Dc, and the 3 rd conductive pattern 82 overlaps the 1 st inclined portion 732 and the 2 nd inclined portion 742 when viewed in the lamination direction Ds.

Description

Converter, meter-use transformer, and gas-insulated switchgear

Technical Field

The present invention relates to a converter, a meter-use variable device, and a gas-insulated switchgear.

Background

The gas-insulated switchgear (GIS: gas Insulated Switchgear) has a structure in which a device such as a breaker unit, a disconnecting switch unit, or a meter transformer is accommodated in a container in which an insulating gas is enclosed (for example, refer to patent document 1). The transformer for meters of the gas-insulated switchgear is provided with a transformer for meters for measuring high voltage. Capacitive voltage dividers are sometimes used as such instrument transformers.

The instrument transformer includes a current transformer for measuring a large current. Rogowski Coil is sometimes used as such a current transformer. Regarding rogowski coils, the following forms are known: the multilayer printed board has 2 windings in mirror image relationship, and has an opening in the center through which a conductor passes (see patent document 2, for example). According to the description of patent document 2, 2 windings are formed by electrically connecting the substrate surface on the outside of the printed board and a radially extending metal foil formed on the inner layer through the substrate. The 2 windings are connected in series in mirror image relationship to form a rogowski coil.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2017-112661

Patent document 2: japanese patent laid-open No. 2003-130894

Disclosure of Invention

Technical problem to be solved by the invention

Regarding the rogowski coil described in patent document 2, it is always desired to reduce noise and improve detection accuracy. In addition, as described in patent document 2, when the substrates are laminated and formed, it is required to appropriately form a wiring pattern on the substrates.

The invention aims to provide a current transformer, a meter transformer and a gas-insulated switching device, which can reduce noise and improve detection precision and facilitate the formation of wiring patterns.

Technical solution for solving technical problems

The current transformer according to the embodiment of the present invention includes: an annular laminated substrate in which a plurality of conductive layers are laminated with an insulating layer interposed therebetween; and a coil portion formed on a laminated substrate, wherein the laminated substrate includes: a plurality of outer through-electrodes provided at intervals in the circumferential direction on the outer peripheral portion and electrically connected to the plurality of conductive layers; and a plurality of inner through-electrodes which are provided at intervals in the circumferential direction in the inner peripheral portion and electrically connected to the plurality of conductive layers, the coil portion including: a positive winding coil wound forward in the 1 st direction in the circumferential direction of the laminated substrate; and a rewind coil wound in reverse direction in the 2 nd direction in the circumferential direction, the forward coil including: a plurality of 1 st conductive patterns provided in the 1 st conductive layer at intervals in the circumferential direction and connected to the outer through electrode and the inner through electrode; and a plurality of 2 nd conductive patterns provided in the 2 nd conductive layer at intervals in the circumferential direction and connected to the outer through electrode and the inner through electrode, the 1 st conductive pattern including: a 1 st inclined portion inclined in the 1 st direction from the radially outer side toward the inner side of the laminated substrate; and a 1 st outer extension portion connected to the outer through electrode and the 1 st inclined portion and extending in a radial direction, the 2 nd conductive pattern including: a 2 nd inclined portion inclined in the 2 nd direction from the radially outer side toward the inner side; and a 2 nd outer extension portion connected to the outer through electrode and the 2 nd inclined portion and extending in the radial direction, wherein the rewind coil includes a 3 rd conductive pattern provided in the 3 rd conductive layer between the 1 st conductive layer and the 2 nd conductive layer and extending in the circumferential direction, the 1 st outer extension portion overlapping the 2 nd outer extension portion when viewed from the lamination direction of the laminated substrate, and the 3 rd conductive pattern overlapping the 1 st inclined portion and the 2 nd inclined portion when viewed from the lamination direction.

The outer through electrode and the inner through electrode may be provided so as to be offset from each other in the circumferential direction when viewed in the radial direction. In addition, the 1 st angle formed by the 1 st outside extension portion and the 1 st inclined portion and the 2 nd angle formed by the 2 nd outside extension portion and the 2 nd inclined portion may be the same angle. Further, the 1 st conductive pattern may include a 1 st inner extension portion, and the 2 nd conductive pattern may include a 2 nd inner extension portion, wherein the 1 st inner extension portion is connected to the inner through electrode and the 1 st inclined portion and extends in the radial direction, and the 2 nd inner extension portion is connected to the inner through electrode and the 2 nd inclined portion and extends in the radial direction. In addition, the 1 st inner extension and the 2 nd inner extension may overlap when viewed from the stacking direction. The 1 st inclined portion and the 2 nd inclined portion may be provided so as to be continuous in the circumferential direction when viewed from the stacking direction.

The meter variable device according to the aspect of the present invention includes the converter according to the aspect described above.

The gas-insulated switchgear according to the aspect of the present invention includes the meter variable device according to the aspect described above.

Effects of the invention

In the current transformer of the above embodiment, since the 1 st outer extending portion of the 1 st conductive pattern constituting the positive coil overlaps the 2 nd outer extending portion of the 2 nd conductive pattern when viewed from the lamination direction, the 1 st inclined portion and the 2 nd inclined portion are arranged in a wavy or zigzag shape in the circumferential direction when viewed from the lamination direction, wherein the 1 st inclined portion is inclined from the 1 st outer extending portion toward the radial inner side in the 1 st direction in the circumferential direction, and the 2 nd inclined portion is inclined from the 2 nd outer extending portion toward the radial inner side in the 2 nd direction in the circumferential direction. Since the 3 rd conductive pattern constituting the rewind coil overlaps the 1 st inclined portion and the 2 nd inclined portion as viewed from the lamination direction, the 3 rd conductive pattern is also continued 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 in a limited space. In addition, the cross section of the forward coil perpendicular to the coil winding direction (spiral direction) is canceled by the cross section of the backward coil, and the influence of the external magnetic field is suppressed, thereby reducing noise and improving detection accuracy. Further, for example, by setting the inclination angle of the 1 st inclined portion with respect to the 1 st direction and the inclination angle of the 2 nd inclined portion with respect to the 2 nd direction to an obtuse angle of about 135 degrees, the wavy curved portion of the 3 rd conductive pattern is about 90 degrees, and no acute angle portion is formed in the 3 rd conductive pattern, so that pattern formation becomes easy.

In the structure in which the outer through electrode and the inner through electrode are disposed so as to be offset from each other in the circumferential direction when viewed in the radial direction, the positive winding coil can be wound forward in the 1 st direction in the circumferential direction of the laminated substrate by passing the 1 st conductive pattern having the 1 st inclined portion, the inner through electrode, the 2 nd conductive pattern having the 2 nd inclined portion, and the outer through electrode in this order. In the structure in which the 1 st angle formed by the 1 st outer extending portion and the 1 st inclined portion and the 2 nd angle formed by the 2 nd outer extending portion and the 2 nd inclined portion are the same angle, the 3 rd conductive pattern overlapping the 1 st inclined portion and the 2 nd inclined portion can be formed in a shape in which a symmetrical pattern is repeated in the circumferential direction.

In the structure in which the 1 st conductive pattern includes the 1 st inner extension portion and the 2 nd conductive pattern includes the 2 nd inner extension portion, the 1 st inclined portion and the 2 nd inclined portion are located at intermediate portions of the outer through electrode and the inner through electrode in the radial direction. Accordingly, the 3 rd conductive pattern can be arranged in the radial direction at the intermediate portion between the outer through electrode and the inner through electrode. In the structure in which the 1 st inner extending portion overlaps the 2 nd inner extending portion when viewed in the stacking direction, the radially inner end of the 1 st inclined portion overlaps the radially inner end of the 2 nd inclined portion when viewed in the stacking direction. Accordingly, the 3 rd conductive pattern can be prevented from being formed so as to be offset from the radially inner end of the 1 st inclined portion and the radially inner end of the 2 nd inclined portion. In addition, the number of turns of the positive coil in the circumferential direction can be increased. In addition, in a structure in which the 1 st inclined portion and the 2 nd inclined portion are provided so as to be continuous in the circumferential direction as viewed from the stacking direction, the 3 rd conductive pattern overlapping the 1 st inclined portion and the 2 nd inclined portion can be formed in a wavy or zigzag shape that is continuous in the circumferential direction.

In addition, according to the meter variable device of the above aspect, since the converter is provided, noise can be reduced and detection accuracy can be improved when detecting a current flowing through the primary conductor.

Further, according to the gas-insulated switchgear of the above aspect, since the gauge variable device having reduced noise and improved detection accuracy is provided, it is possible to provide a high-performance gas-insulated switchgear.

Drawings

Fig. 1 is an external view showing an example of a gas-insulated switchgear according to an embodiment.

Fig. 2 is an external view showing an example of the gauge.

Fig. 3 is a cross-sectional view showing an example of the internal structure of the gauge.

Fig. 4 is a cross-sectional view showing an example of the structure of the current transformer.

Fig. 5 is a diagram showing an example of the structure of the 1 st conductive pattern of the current transformer.

Fig. 6 is a diagram showing an example of the structure of the 3 rd conductive pattern of the current transformer.

Fig. 7 is a diagram showing an example of the structure of the 2 nd conductive pattern of the current transformer.

Fig. 8 is a perspective view showing a partial structure of a forward winding coil and a reverse winding coil of the current transformer.

Fig. 9 is a diagram showing an example of the 1 st conductive pattern.

Fig. 10 is a diagram showing an example of the 2 nd conductive pattern.

Fig. 11 is a diagram showing an example of the 3 rd conductive pattern.

Fig. 12 is a diagram showing the relationship between the 1 st and 2 nd conductive patterns of the forward coil and the 3 rd conductive pattern of the reverse coil.

Fig. 13 is an enlarged view of a part of the positive coil.

Reference numerals

1: a gas-insulated switching device; 50: a variable device for the instrument; 55: a capacitive voltage divider; 60: a current transformer; 61: laminating substrates; 61a: an outer peripheral portion; 61b: an inner peripheral portion; 63: a substrate; 62: a coil section; 64: a conductive layer; 64A: 1 st conductive layer (conductive layer); 64C: a 3 rd conductive layer (conductive layer); 64D: a 2 nd conductive layer (conductive layer); 65: an insulating layer; 70: a positive coil; 71. 71F, 71H, 71S: an outer through electrode; 72. 72E: an inner through electrode; 73. 73F, 73H: 1 st conductive pattern; 731: a 1 st outer extension; 732: a 1 st inclined portion; 733: 1 st inner extension; 74: a 2 nd conductive pattern; 741: a 2 nd outer extension; 742: a 2 nd inclined portion; 743: a 2 nd inner extension; 80: rewinding the coil; 82: a 3 rd conductive pattern; dc: circumferential direction; dc1: direction 1; dc2: a 2 nd direction; dr: radial direction; ds: a lamination direction; θ: an angle; θ1: angle 1; θ2: angle 2.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following description. In order to explain the embodiments, some of the drawings are enlarged or emphasized, and the drawings are shown with the scale being changed as appropriate, and the dimensions and shapes may be different from those of actual products. Fig. 1 is a diagram showing an example of a gas-insulated switchgear 1 according to the embodiment. The gas-insulated switchgear 1 of the present embodiment is provided in a transformer substation or the like. The gas-insulated switchgear 1 of the present embodiment is provided in a high-voltage 3-phase ac power system such as 24kV to 1100 kV.

As shown in fig. 1, the gas-insulated switchgear 1 includes a breaker unit 2, 1 st and 2 nd breaker units 3A and 3B, and a power receiving side unit 5. The breaker unit 2 includes a breaker tank 21 and a breaker (not shown) accommodated in the breaker tank 21. The 1 st and 2 nd disconnecting switch units 3A and 3B are disposed on one side of the breaker unit 2. The 1 st and 2 nd disconnecting switch units 3A and 3B each include a disconnecting switch tank 31 connected to the breaker tank 21 and a bus bar disconnecting switch (not shown) provided in the disconnecting switch tank 31. The 1 st and 2 nd disconnecting switch units 3A and 3B are connected to the 1 st and 2 nd buses (not shown), respectively.

The power receiving side unit 5 is disposed on the other side of the breaker unit 2. As shown in fig. 1 to 3, the power receiving side unit 5 includes a tank 51 and a meter variable 50. The can 51 is formed in a cylindrical shape extending in an axial direction Da along the central axis 51 c. As shown in fig. 1, one end 51a of the tank 51 is connected to the breaker tank 21. The other end 51b of the tank 51 is connected to the power receiving side. As shown in fig. 3, in the tank 51, meters 50 are provided for each of 3 phases, and a total of 3 sets of meters 50 are provided. The 3-group meter variables 50 are arranged at intervals in the circumferential direction Dc around the central axis 51c of the tank 51.

Each meter variable 50 is provided on the outer peripheral side of a primary conductor 52 extending in the axial direction Da in a tank 51, and is electrically connected to the tank 51 via an attachment plate 100. Each meter 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 meter variable 50. That is, each meter variable device 50 includes 2 sets of capacitive voltage dividers 55 and current transformers 60 along the axial direction Da. Each meter variable device 50 includes 2 capacitive voltage dividers 55 at the center in the axial direction Da. Each meter variable device 50 includes inverters 60 on both sides in the axial direction Da for each of the 2 capacitive voltage dividers 55. In the present embodiment, each meter variable 50 is provided with 2 sets of capacitive voltage dividers 55 and inverters 60, but the present invention is not limited thereto. Each meter variable 50 may be provided with only 1 set of the capacitive voltage divider 55 and the inverter 60.

Each capacitive voltage divider 55 divides the high voltage flowing through the primary conductor 52. The capacitance 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 radially outside the primary conductor 52 before and after the capacitive divider 55. The current transformer 60 is used as a detection coil for detecting a current value of a high voltage flowing through the primary conductor 52. The inverter 60 is connected to a signal processing device not shown. The signal processing device detects the value of the current flowing through the primary conductor based on the signal waveform output from the current transformer 60. In the present embodiment, the current transformer 60 is disposed outside the primary conductor 52 in the radial direction Dr, but the installation position may be changed as appropriate. For example, the current transformer 60 may be disposed outside the capacitive voltage divider 55 in the radial direction Dr.

As shown in fig. 4 to 7, the current transformer 60 includes a laminated substrate 61 and a coil portion 62. The laminated substrate 61 has an annular shape and an opening 61h in the center. The laminated substrate 61 is plate-shaped having a predetermined thickness in the axial direction Da. As shown in fig. 4, the laminated substrate 61 includes a plurality of conductive layers 64 laminated on both surfaces of a substrate 63. In this embodiment, for example, 4 conductive layers 64A to 64D are stacked in the axial direction Da (hereinafter, a direction in which the plurality of conductive layers 64 are stacked is referred to as a stacking direction Ds). The plurality of conductive layers 64A to 64D are stacked with the insulating layer 65 interposed therebetween through the substrate 63 as an insulating layer. The conductive layers 64A to 64D are formed of a conductive material, and are formed with conductive patterns, electrodes, and the like, which will be described later, by photolithography or the like.

As shown in fig. 4 to 11, the laminated substrate 61 includes a plurality of outer through-electrodes 71 and a plurality of inner through-electrodes 72. The outer through electrode 71 and the inner through electrode 72 electrically connect the plurality of conductive layers 64A to 64D, respectively. The outer through electrode 71 and the inner through electrode 72 extend in the stacking direction Ds and penetrate the plurality of conductive layers 64A to 64D, the substrate 63, and the insulating layer 65, respectively, and are formed in a cylindrical shape, for example.

The plurality of outer through-electrodes 71 are provided at intervals in the circumferential direction Dc on the outer peripheral portion 61a of the laminated substrate 61. The plurality of outer through-electrodes 71 are provided at equal intervals in the circumferential direction Dc on a concentric circle centered on the central axis 61c of the laminated substrate 61. The outer through-electrodes 71 adjacent to each other in the circumferential direction Dc are arranged at an angle θ with respect to the central axis 61 c.

The plurality of inner through-electrodes 72 are provided at intervals in the circumferential direction Dc in the inner peripheral portion 61b of the laminated substrate 61. The plurality of inner through-electrodes 72 are provided at equal intervals in the circumferential direction Dc. As shown in fig. 12, adjacent inner through-electrodes 72 in the circumferential direction Dc are arranged at an angle θ with respect to the circumferential direction Dc. The outer through electrode 71 and the inner through electrode 72 are provided so as to be offset in the circumferential direction Dc when viewed from the radial direction Dr. The plurality of inner through-electrodes 72 are arranged so as to be offset from the plurality of outer through-electrodes 71 by an angle θ/2 in the circumferential direction Dc. That is, the following state is obtained when viewed from the stacking direction Ds: the virtual line passing through the radial direction Dr of the inner through electrode 72 does not coincide with the virtual line passing through the radial direction Dr of the outer through electrode 71, but passes between 2 outer through electrodes 71 (near the center).

As shown in fig. 4 to 12, the coil portion 62 includes a forward coil 70 and a reverse coil 80. The positive winding coil 70 is wound forward in the 1 st direction Dc1 of the circumferential direction Dc of the laminated substrate 61. The rewind coil 80 is wound in reverse in the 2 nd direction Dc2 of the circumferential direction Dc.

The positive coil 70 includes a plurality of 1 st conductive patterns 73, a plurality of 2 nd conductive patterns 74, a plurality of outer through-electrodes 71 provided on the laminated substrate 61, and a plurality of inner through-electrodes 72 provided on the laminated substrate 61. The plurality of 1 st conductive patterns 73 are provided to the conductive layer 64 located at one end portion in the stacking direction Ds (axial direction Da) of the plurality of conductive layers 64. In the present embodiment, the 1 st conductive patterns 73 are provided in the 1 st conductive layer 64A located at one end portion of the plurality of conductive layers 64 in the stacking direction Ds. The 1 st conductive patterns 73 are provided at intervals in the circumferential direction Dc in the 1 st conductive layer 64A. Both ends of each 1 st conductive pattern 73 are connected to the outer through electrode 71 and the inner through electrode 72.

As shown in fig. 8, 9, and 12, the 1 st conductive pattern 73 includes a 1 st outer extending portion 731, a 1 st inclined portion 732, and a 1 st inner extending portion 733. One end of the 1 st outer extension 731 is connected to the outer through electrode 71. The 1 st outer extension 731 extends inward in the radial direction Dr from the outer through electrode 71. The other end of the 1 st outside extension 731 is connected to the 1 st inclined portion 732. The 1 st outer extension 731 is connected to the outer through electrode 71 and the 1 st inclined portion 732. The 1 st inclined portion 732 is disposed inside the radial direction Dr with respect to the 1 st outside extension 731. The 1 st inclined portion 732 extends obliquely in the 1 st direction Dc1 of the circumferential direction Dc from the outside to the inside of the radial direction Dr. The other end of the 1 st inclined portion 732 is connected to one end of the 1 st inner extending portion 733. The 1 st inner extending portion 733 extends inward in the radial direction Dr from the other end of the 1 st inclined portion 732. The other end of the 1 st inner extension 733 is connected to the inner through electrode 72. The 1 st inner extension 733 is connected to the 1 st inclined portion 732 and the inner through electrode 72.

As shown in fig. 4, a plurality of 2 nd conductive patterns 74 are provided on the conductive layer 64 located at the other end portion in the stacking direction Ds (axial direction Da) of the plurality of conductive layers 64. In the present embodiment, the plurality of 2 nd conductive patterns 74 are provided on the 2 nd conductive layer 64D located at the other end portion of the plurality of conductive layers 64 in the stacking direction Ds. The plurality of 2 nd conductive patterns 74 are disposed at intervals in the circumferential direction Dc in the 2 nd conductive layer 64D. As shown in fig. 8, 10, and 12, the second conductive patterns 74 have both ends connected to the outer through electrode 71 and the inner through electrode 72.

The 2 nd conductive pattern 74 includes a 2 nd outside extension 741, a 2 nd inclined portion 742, and a 2 nd inside extension 743. One end of the 2 nd outer extension 741 is connected to the outer through electrode 71. The 2 nd outer extension 741 extends inward in the radial direction Dr from the outer through electrode 71. The other end of the 2 nd outside extension 741 is connected to the 2 nd inclined portion 742. The 2 nd outer extension 741 is connected to the outer through electrode 71 and the 2 nd inclined portion 742. The 2 nd inclined portion 742 is provided inside the radial direction Dr with respect to the 2 nd outside extension portion 741. The 2 nd inclined portion 742 extends obliquely in the 2 nd direction Dc2 of the circumferential direction Dc from the outside to the inside of the radial direction Dr. The other end of the 2 nd inclined portion 742 is connected to one end of the 2 nd inner extension portion 743. The 2 nd inner extension 743 extends inward in the radial direction Dr from the other end of the 2 nd inclined portion 742. The other end of the 2 nd inner extension 743 is connected to the inner through electrode 72. The 2 nd inner extension 743 is connected to the 2 nd inclined portion 742 and the inner through electrode 72.

As shown in fig. 8 and 12, the 1 st outer extension 731 of the 1 st conductive pattern 73 and the 2 nd outer extension 741 of the 2 nd conductive pattern 74 connected to the outer through electrode 71 extend in the radial direction Dr. That is, the 1 st outer extension 731 of the 1 st conductive pattern 73 connected to each outer through electrode 71 overlaps the 2 nd outer extension 741 of the 2 nd conductive pattern 74 when viewed in the stacking direction Ds. The 1 st inner extension 733 of the 1 st conductive pattern 73 and the 2 nd inner extension 743 of the 2 nd conductive pattern 74 connected to the inner through electrode 72 extend in the radial direction Dr. That is, the 1 st inner extension 733 of the 1 st conductive pattern 73 connected to each inner through electrode 72 overlaps the 2 nd inner extension 743 of the 2 nd conductive pattern 74 when viewed in the stacking direction Ds.

The 1 st inclined portion 732 of the 1 st conductive pattern 73 coincides with the 2 nd inclined portion 742 of the 2 nd conductive pattern 74 in the radial direction Dr. Since the 1 st outside extension 731 overlaps the 2 nd outside extension 741 when viewed from the stacking direction Ds, the connecting portion J11 overlaps the connecting portion J12 when viewed from the stacking direction Ds, wherein the connecting portion J11 is a connecting portion between an end of the 1 st inclined portion 732 on the outer side in the radial direction Dr and the 1 st outside extension 731, and the connecting portion J12 is a connecting portion between an end of the 2 nd inclined portion 742 on the outer side in the radial direction Dr and the 2 nd outside extension 741. The 1 st inclined portion 732 and the 2 nd inclined portion 742 extend in a V-shape inward in the radial direction Dr from the connection portions J11, J12 with the 1 st outside extension 731 and the 2 nd outside extension 741 at the outer end portion in the radial direction Dr as viewed in the stacking direction Ds. Here, in the present embodiment, the 1 st angle θ1 formed by the 1 st outer extending portion 731 and the 1 st inclined portion 732 is the same angle as the 2 nd angle θ2 formed by the 2 nd outer extending portion 741 and the 2 nd inclined portion 742.

Since the 1 st inner extending portion 733 overlaps the 2 nd inner extending portion 743 when viewed from the stacking direction Ds, the connecting portion J13 overlaps the connecting portion J14 when viewed from the stacking direction Ds, wherein the connecting portion J13 is a connecting portion between an end of the 1 st inclined portion 732 on the inner side in the radial direction Dr and the 1 st inner extending portion 733, and the connecting portion J14 is a connecting portion between an end of the 2 nd inclined portion 742 on the inner side in the radial direction Dr and the 2 nd inner extending portion 743. The 1 st inclined portion 732 and the 2 nd inclined portion 742 extend in a V-shape outward in the radial direction Dr from the connection portions J13, J14 with the 1 st inner extending portion 733 and the 2 nd inner extending portion 743 at the inner end in the radial direction Dr, as viewed in the stacking direction Ds. Here, in the present embodiment, the 3 rd angle θ3 formed by the 1 st inner extending portion 733 and the 1 st inclined portion 732 is the same angle as the 4 th angle θ4 formed by the 2 nd inner extending portion 743 and the 2 nd inclined portion 742. As described above, the 1 st inclined portion 732 and the 2 nd inclined portion 742 are provided continuously in a wavy and zigzag manner along the circumferential direction Dc when viewed from the stacking direction Ds.

As shown in fig. 12 and 13, the 1 st angle θ1 (3 rd angle θ3) and the 2 nd angle θ2 (4 th angle θ4) are respectively set to obtuse angles. For example, the 1 st angle θ1 and the 2 nd angle θ2 are set to 91 degrees to 135 degrees, for example. By setting the 1 st angle θ1 and the 2 nd angle θ2 to about 135 degrees, the angles formed by the 1 st inclined portion 732 and the 2 nd inclined portion 742 are about 90 degrees, respectively, when viewed from the stacking direction Ds, and the wavy curved portion is prevented from forming an acute angle. Further, by setting the 1 st angle θ1 and the 2 nd angle θ2 to about 135 degrees, the 1 st conductive pattern 73 or the 2 nd conductive pattern 74 can be prevented from widening in the circumferential direction Dc. As a result, a large number of 1 st conductive patterns 73 or 2 nd 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 in a limited space.

As shown in fig. 8 and 9, the connection terminal 77 is connected to the outer through electrode 71S disposed at the winding start position with respect to the positive coil 70, and the connection terminal 77 is connected to an external input terminal. The positive coil 70 is a spiral coil wound in the 1 st direction Dc1 in the circumferential direction Dc by passing through the 1 st conductive pattern 73, the inner through electrode 72, the 2 nd conductive pattern 74, and the outer through electrode 71 in this order. The forward coil 70 is connected to the rewind coil 80 via an inner through electrode 72E disposed at the winding end position.

As shown in fig. 4 and 8, the rewind coil 80 is provided in the conductive layer 64 between the 1 st conductive layer 64A and the 2 nd conductive layer 64D. In the present embodiment, the rewind coil 80 is provided in the 3 rd conductive layer 64C between the 1 st conductive layer 64A and the 2 nd conductive layer 64D. The rewind coil 80 may also be disposed in the conductive layer 64B between the 1 st conductive layer 64A and the 2 nd conductive layer 64D. As shown in fig. 8 and 11, the rewind coil 80 includes a 3 rd inner extension 81, a 3 rd conductive pattern 82, and a 3 rd outer extension 83.

One end of the 3 rd inner extension 81 is connected to the inner through electrode 72E disposed at the winding end position of the positive coil 70 in the 3 rd conductive layer 64C. The 3 rd inner extension 81 extends outward in the radial direction Dr from the inner through electrode 72E. The other end of the 3 rd inner extension 81 is connected to the start end 82s of the 3 rd conductive pattern 82.

The 3 rd conductive pattern 82 extends from the start end 82s toward the end 82e in the 2 nd direction Dc2 of the circumferential direction Dc. As shown in fig. 8 and 12, the 3 rd conductive pattern 82 overlaps the 1 st inclined portion 732 and the 2 nd inclined portion 742 when viewed in the stacking direction Ds. The 3 rd conductive pattern 82 alternately includes 3 rd and 4 th inclined portions 813 and 814 in the circumferential direction Dc, wherein the 3 rd inclined portion 813 overlaps the 1 st inclined portion 732 when viewed in the stacking direction Ds and the 4 th inclined portion 814 overlaps the 2 nd inclined portion 742 when viewed in the stacking direction Ds. The position of the 3 rd conductive pattern 82 in the radial direction Dr coincides with the positions of the 1 st inclined portion 732 and the 2 nd inclined portion 742 in the radial direction Dr.

The connection portion J31 overlaps the connection portion J11 and the connection portion J12 when viewed from the stacking direction Ds, wherein the connection portion J31 is a connection portion between an end of the 3 rd inclined portion 813 outside the radial direction Dr and an end of the 4 th inclined portion 814 outside the radial direction Dr, the connection portion J11 is a connection portion between an end of the 1 st inclined portion 732 outside the radial direction Dr and the 1 st outside extension portion 731, and the connection portion J12 is a connection portion between an end of the 2 nd inclined portion 742 outside the radial direction Dr and the 2 nd outside extension portion 741. The joint portion J32 overlaps the connection portion J13 and the connection portion J14 when viewed from the stacking direction Ds, the joint portion J32 being a joint portion between an end of the 3 rd inclined portion 813 inside the radial direction Dr and an end of the 4 th inclined portion 814 inside the radial direction Dr, the connection portion J13 being a connection portion between an end of the 1 st inclined portion 732 inside the radial direction Dr and the 1 st inside extension portion 733, and the connection portion J14 being a connection portion between an end of the 2 nd inclined portion 742 inside the radial direction Dr and the 2 nd inside extension portion 743.

As shown in fig. 8 and 11, one end of the 3 rd outer extension 83 is connected to the end 82e of the 3 rd conductive pattern 82. The 3 rd outside extension 83 extends outward in the radial direction Dr. In the 3 rd conductive layer 64C, the other end of the 3 rd outer extension 83 is connected to the outer through electrode 71F disposed at the winding end position of the rewind coil 80. In the 1 st conductive layer 64A, a connection terminal 78 to which an external output terminal is connected to the outer through electrode 71F. The rewind coil 80 is a planar coil that is wound forward in the 2 nd direction Dc2 of the circumferential direction Dc through the 3 rd conductive pattern 82 from the inner through electrode 72E disposed at the winding end position of the forward coil 70.

Here, as shown in fig. 8, the 1 st conductive pattern 73F of the positive coil 70 in which the 1 st outer extending portion 731 and the 3 rd outer extending portion 83 overlap each other is connected to the outer through electrode 71S arranged so as to avoid interference with the outer through electrode 71F via the bent portion 79 when viewed from the stacking direction Ds. The outer through electrode 71H to which the other 1 st conductive pattern 73H adjacent to the 1 st conductive pattern 73F is connected is arranged inside the radial direction Dr so as to avoid interference with the outer through electrode 71S and the bent portion 79.

As described above, according to the current transformer 60, the meter variable device 50, and the gas-insulated switchgear 1 of the present embodiment, since the 1 st outer extending portion 731 of the 1 st conductive pattern 73 constituting the positive winding coil 70 overlaps the 2 nd outer extending portion 741 of the 2 nd conductive pattern 74 when viewed from the stacking direction Ds, the 1 st inclined portion 732 and the 2 nd inclined portion 742 are arranged in a wavy or zigzag shape along the circumferential direction Dc, wherein the 1 st inclined portion 732 is inclined from the 1 st outer extending portion 731 to the inside of the radial direction Dr in the 1 st direction Dc1 of the circumferential direction Dc, and the 2 nd inclined portion 742 is inclined from the 2 nd outer extending portion 741 to the inside of the radial direction Dr in the 2 nd direction Dc2 of the circumferential direction Dc.

Since the 3 rd conductive pattern 82 constituting the rewind coil 80 overlaps the 1 st inclined portion 732 and the 2 nd inclined portion 742 when viewed from the lamination direction Ds, the 3 rd conductive pattern 82 is continuous in a wavy or zigzag shape along the circumferential direction Dc. In addition, the 1 st angle θ1 and the 2 nd angle θ2 are set to obtuse angles of 91 degrees to 135 degrees, whereby formation of an acute angle portion in the 3 rd conductive pattern 82 can be avoided. That is, when patterning, the acute angle portion is likely to be defective, and the possibility of occurrence of a failure of the rewind coil 80 increases. Therefore, although close attention is required in forming the 3 rd conductive pattern 82, by modifying in the above-described manner, there is no acute angle portion in the 3 rd conductive pattern 82, so the 3 rd conductive pattern 82 can be easily formed. In addition, the cross section perpendicular to the coil winding direction (spiral direction) in the forward coil 70 is canceled out by the cross section of the reverse coil 80, and the influence thereof is suppressed. As a result, noise can be reduced and detection accuracy can be improved.

In the configuration in which the outer through electrode 71 and the inner through electrode 72 are disposed so as to be offset from each other in the circumferential direction Dc when viewed from the radial direction Dr, the positive coil 70 can be wound forward in the 1 st direction Dc1 of the circumferential direction Dc of the laminated substrate 61 with a simple configuration by passing the 1 st conductive pattern 73 including the 1 st inclined portion 732, the inner through electrode 72, the 2 nd conductive pattern 74 including the 2 nd inclined portion 742, and the outer through electrode 71 in this order.

In the structure in which the 1 st angle θ1 formed by the 1 st outside extension portion 731 and the 1 st inclined portion 732 and the 2 nd angle θ2 formed by the 2 nd outside extension portion 741 and the 2 nd inclined portion 742 are the same angle, the 3 rd conductive pattern 82 overlapping the 1 st inclined portion 732 and the 2 nd inclined portion 742 can be formed in a shape in which a symmetrical pattern is repeated in the circumferential direction Dc. As described above, by setting the 1 st angle θ1 and the 2 nd angle θ2 to an obtuse angle in the range of 91 degrees to 135 degrees, the bent portion of the 3 rd conductive pattern 82 can be made to be an obtuse angle of 90 degrees or more. As a result, the 3 rd conductive pattern 82 can be formed appropriately at a portion of the 3 rd conductive pattern 82 where no acute angle is present.

In the structure in which the 1 st conductive pattern 73 includes the 1 st inner extension portion 733 and the 2 nd conductive pattern 74 includes the 2 nd inner extension portion 743, the 1 st inclined portion 732 and the 2 nd inclined portion 742 are located at intermediate portions of the outer through electrode 71 and the inner through electrode 72 in the radial direction Dr. Accordingly, the 3 rd conductive pattern 82 can be arranged in the intermediate portion between the outer through electrode 71 and the inner through electrode 72 in the radial direction Dr.

In the structure in which the 1 st inner extending portion 733 and the 2 nd inner extending portion 743 overlap each other when viewed in the stacking direction Ds, the end of the 1 st inclined portion 732 on the inner side in the radial direction Dr overlaps the end of the 2 nd inclined portion 742 on the inner side in the radial direction Dr when viewed in the stacking direction Ds. Accordingly, the 3 rd conductive pattern 82 can be prevented from extending long in the circumferential direction Dc at a portion overlapping with the end portion of the 1 st inclined portion 732 on the inner side in the radial direction Dr and the end portion of the 2 nd inclined portion 742 on the inner side in the radial direction Dr. 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.

In addition, in a structure in which the 1 st inclined portion 732 and the 2 nd inclined portion 742 are provided so as to be continuous in the circumferential direction Dc when viewed from the stacking direction Ds, the 3 rd conductive pattern 82 overlapping the 1 st inclined portion 732 and the 2 nd inclined portion 742 may be formed in a wavy or zigzag shape continuous in the circumferential direction Dc.

The embodiments have been described above, but the technical scope of the present invention is not limited to the scope described in the above embodiments. 1 or more elements described in the above embodiments may be omitted. The elements described in the above embodiments can be combined as appropriate. In addition, it is apparent to those skilled in the art that various modifications and improvements can be made to the above-described embodiments. Such a modified or improved form is also included in the technical scope of the present invention. For example, in the above embodiment, a plurality of inverters 60 may be arranged in the axial direction Da.

Claims (8)

1. A current transformer is provided with:

an annular laminated substrate in which a plurality of conductive layers are laminated with an insulating layer interposed therebetween; and

a coil part formed on the laminated substrate,

wherein the laminated substrate comprises:

a plurality of outer through-electrodes provided at intervals in the circumferential direction on the outer peripheral portion and electrically connected to the plurality of conductive layers; and

a plurality of inner through-electrodes which are provided at intervals in the circumferential direction in the inner peripheral portion and electrically connected to the plurality of conductive layers,

the coil part includes:

a forward winding coil wound forward in a 1 st direction in a circumferential direction of the laminated substrate; and

a rewind coil wound in reverse in the 2 nd direction in the circumferential direction,

the positive coil is provided with:

a plurality of 1 st conductive patterns provided on the 1 st conductive layer at intervals along the circumferential direction and connected to the outer through electrode and the inner through electrode; and

a plurality of 2 nd conductive patterns provided on the 2 nd conductive layer at intervals along the circumferential direction and connected to the outer through electrode and the inner through electrode,

the 1 st conductive pattern includes:

a 1 st inclined portion inclined in the 1 st direction from a radially outer side to an inner side of the laminated substrate; and

a 1 st outer extension portion connected to the outer through electrode and the 1 st inclined portion and extending in the radial direction,

the 2 nd conductive pattern includes:

a 2 nd inclined portion inclined in the 2 nd direction from the outer side toward the inner side in the radial direction; and

a 2 nd outer extension portion connected to the outer through electrode and the 2 nd inclined portion and extending in the radial direction,

the rewind coil is provided with a 3 rd conductive pattern which is arranged on the 3 rd conductive layer between the 1 st conductive layer and the 2 nd conductive layer and extends along the circumferential direction,

the 1 st outer extension portion overlaps the 2 nd outer extension portion when viewed from the lamination direction of the laminated substrate,

the 3 rd conductive pattern overlaps the 1 st inclined portion and the 2 nd inclined portion as viewed from the lamination direction.

2. The current transformer of claim 1, wherein,

the outer through electrode and the inner through electrode are provided so as to be offset from each other in the circumferential direction when viewed in the radial direction.

3. The current transformer according to claim 1 or 2, wherein,

the 1 st angle formed by the 1 st outer extending part and the 1 st inclined part is the same as the 2 nd angle formed by the 2 nd outer extending part and the 2 nd inclined part.

4. A current transformer according to any one of claims 1 to 3, wherein,

the 1 st conductive pattern includes a 1 st inner extension portion connected to the inner through electrode and the 1 st inclined portion and extending in the radial direction,

the 2 nd conductive pattern includes a 2 nd inner extension portion that is connected to the inner through electrode and the 2 nd inclined portion and extends in the radial direction.

5. The current transformer of claim 4, wherein,

the 1 st inner extension overlaps the 2 nd inner extension when viewed from the stacking direction.

6. The current transformer according to any one of claims 1 to 5, wherein,

the 1 st inclined portion and the 2 nd inclined portion are provided continuously in the circumferential direction as viewed from the stacking direction.

7. An instrument transformer comprising the converter according to any one of claims 1 to 6.

8. A gas-insulated switchgear comprising the meter transformer according to claim 7.