JP5285357B2 - Current transformer - Google Patents

Description

  The present invention relates to a current transformer, and is particularly suitable for application to a split-type current transformer that sandwiches an electric wire and measures current (load current, leakage current, ground fault current, etc.) flowing through the electric wire.

  Conventionally, there is a split type current transformer in which secondary windings (coils) are evenly wound around a core core material in which semicircular plate magnetic pieces are stacked and these are combined in a donut shape. Since the donut-shaped core portion has a small positional difference between the primary conductor penetrating portions and a small voltage induced even with respect to the external magnetic field, high measurement accuracy can be obtained. However, since the semicircular plate magnetic piece has a low efficiency in picking up the parts, the parts cost increases. Further, since the coil needs to be wound evenly along the arc, a special machine is required and the winding cost is increased.

In this respect, conventionally, a bobbin assembly in which a coil is wound in advance is inserted into a core core material in which strip-shaped plate magnetic pieces are stacked, and the four core portions thus obtained are combined in a rectangular shape. A divided current transformer is known (Patent Documents 1 and 2). The strip-shaped plate magnetic piece is low in parts cost because there is little waste in parts removal. Further, since the bobbin is not curved, there are advantages such as easy winding of the coil.
Utility Model Registration No. 3099308 JP 2000-91545 A

  However, when the above strip-shaped plate magnetic pieces are stacked, there are four places where the core core material is joined, so that the magnetic resistance increases, and the magnetic resistance greatly fluctuates due to variations and fluctuations in the joining state. Cause a decline. In addition, since the number of cores is as large as four, the number of parts and the manufacturing cost due to winding work increase. Moreover, since there are many joint parts of a core core material, it is easy to receive the influence of an external magnetic field.

  The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a current transformer that is easy to manufacture and can stably obtain high detection accuracy.

In order to solve the above-described problem, the current transformer according to the first aspect of the present invention has a laminated state in which only L-shaped plate magnetic pieces are laminated and fitted to at least one bobbin to maintain the laminated state. The two core core members are combined so as to form a rectangular ring as a whole, and the core portion is detachable at the joint portion of the two core core members, and the secondary winding is wound around the two core core members. Is.

  According to the present invention, since the L-shaped core core material has only two joint portions, the magnetic resistance is small, and there are few variations and fluctuations in the joint state, and high measurement accuracy can be stably maintained. In addition, the number of L-shaped magnetic plate pieces is small, and the plate cost (the rate at which components can be removed from the material) is good, so the component cost is low. In addition, the L-shaped plate magnetic piece is easy to align at the time of lamination, and the manufacturing cost is low because the secondary winding can be wound linearly. Also, since the L-shaped core core material has few joints, it is difficult to be affected by an external magnetic field.

  In the second aspect of the present invention, the plate magnetic piece has a long side portion corresponding to a long side and a short side portion corresponding to a short side, and the core core material is long in the stacking direction of the plate magnetic pieces. Side portions and short side portions are alternately stacked, and the core portions are combined such that the long side portions of the two core core members mesh with each other in the stacking direction of the plate magnetic pieces.

  According to the present invention, the L-shaped core core material has a small number of joints as two, and at each joint, a stable magnetic path can always be formed by side contact and surface contact between the plate magnetic pieces. Measurement accuracy can be maintained.

  In the third aspect of the present invention, when the length of the long side portion of the plate magnetic piece is a, the length of the short side portion is b, and the plate width is c, there is a relationship of a = b + c. According to the present invention, since the core portion can be composed of the same size plate magnetic piece, the component cost is low. In addition, the core core material in this case comprises a square ring.

In the fourth aspect of the present invention, the secondary winding is wound around at least one of the two core core members. According to the present invention, since it is sufficient if there are at least two secondary windings, it is possible to reduce component costs and winding costs while maintaining high measurement accuracy .

In the fifth aspect of the present invention, the secondary winding is wound symmetrically around two core core members. According to the present invention, since the structure composed of the core core material and the secondary winding is symmetric around the primary conductor, the magnetic flux generated by the primary current is symmetrically linked to each secondary winding. Thus, the primary current can be properly detected. In addition, the influence of the external magnetic field cancels out between the secondary windings, and is hardly affected by the external magnetic field .

  According to a sixth aspect of the present invention, there are provided first and second outer cases that can be divided into two with a shaft corresponding to one of the joints as a fulcrum, with both joints of the two core cores as a boundary. The core core members are supported by the first and second outer cases, respectively. According to the present invention, the core core material is composed of only the plate magnetic pieces, and it is not necessary to provide a mechanism relating to the division, so that stable magnetic characteristics can be maintained.

  According to a seventh aspect of the present invention, there is provided a bobbin for fitting and holding the core core material, and the bobbin is supported by a convex pin provided integrally with the inner wall of each of the first and second outer cases. The According to the present invention, since the bobbin (secondary winding) and the core core can be accurately supported and fixed on the basis of the outer case, this type of split type current transformer is easy to manufacture, The assembly accuracy of the secondary winding can be easily maintained.

  As described above, since the current transformer according to the present invention is easy to manufacture and can stably obtain high detection accuracy, it greatly contributes to improvement of detection accuracy and reliability of the current transformer.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a diagram for explaining a structure of a core portion of a current transformer according to an embodiment. The core portion 10 is configured by combining two core core members 10a and 10b formed by laminating L-shaped plate magnetic pieces so as to form a rectangular ring as a whole. As the plate magnetic piece, for example, permalloy, electromagnetic soft iron, silicon steel plate and the like can be used. Preferably, the core core materials 10a and 10b are configured by laminating plate magnetic pieces of the same size. This will be specifically described below.

When the length of the long side portion of the plate magnetic piece 1 is a, the length of the short side portion is b, and the plate width is c, there is a relationship of a = b + c. When the plate magnetic piece 1 is inverted 180 ° around the auxiliary line P, a plate magnetic piece 2 is obtained. When the plate magnetic piece 1 is overlaid on the plate magnetic piece 2, the long side portion of the plate magnetic piece 1 is obtained. is lengthened by the short sides by Rimoita width c of the plate magnetic piece 2, also short sides of the plate magnetic piece 1 is just long sides by Rimoita width c of the plate magnetic piece 2 short. The same applies to the plate magnetic piece 3 and the plate magnetic piece 4, and the core core material 10a is obtained by laminating these plate magnetic pieces 1 to 4 in the Z-axis direction.

On the other hand, when the plate magnetic piece 1 is rotated 180 ° around the Z axis, the plate magnetic piece 5 is obtained. When the plate magnetic piece 5 is inverted by 180 ° around the auxiliary line Q, a plate magnetic piece 6 is obtained. When the plate magnetic piece 5 is overlapped with the plate magnetic piece 6, the long side portion of the plate magnetic piece 5 is obtained . The length a is longer than the length b of the short side portion of the plate magnetic piece 6 by the plate width c, and the length b of the short side portion of the plate magnetic piece 5 is the length a of the long side portion of the plate magnetic piece 6. Shorter than the plate width c. The same applies to the plate magnetic piece 7 and the plate magnetic piece 8, and the core core material 10b is obtained by laminating these plate magnetic pieces 5 to 8 in the Z-axis direction. In this way, the two core core materials 10a and 10b are obtained by stacking the plate magnetic pieces 1 to 8 of the same size.

Further, the two core core members 10a and 10b are combined so as to form a rectangular ring as a whole, and are detachably joined at the two joint portions 11a and 11b. In this state, both ends 1a and 1b of the plate magnetic piece 1 are in contact with both ends 5b and 5a of the plate magnetic piece 5 at respective sides to form a magnetic path. The same applies to the plate magnetic piece 2 and the plate magnetic piece 6. At the same time, the back surface of the end portion 1 a of the plate magnetic piece 1 and the surface of the end portion 6 a of the plate magnetic piece 6 are in surface contact, and the back surface of the end portion 5 a of the plate magnetic piece 5 and the end portion 2 a of the plate magnetic piece 2. Surface contact with the surface. The same applies to the plate magnetic pieces 3 and 4 and the plate magnetic pieces 7 and 8. Thus, a dense and stable magnetic path is always formed between the two core core members 10a and 10b by the side contact and the surface contact of the plate magnetic piece.

  According to the present embodiment, since the L-shaped core cores 10a and 10b have only two joint portions, the magnetic resistance is small, and there are few variations and fluctuations in the joint state, and high measurement accuracy can be stably maintained. . In addition, the number of L-shaped magnetic plate pieces is small and the plate cost is good, so that the component cost is low. In particular, the use of plate magnet pieces of the same size can greatly reduce the component cost. In addition, the L-shaped plate magnetic piece is easy to align at the time of lamination, and the manufacturing cost is low because the secondary winding can be wound linearly. Also, since the L-shaped core core material has few joints, it is difficult to be affected by an external magnetic field.

FIG. 2 is a diagram for explaining a winding method of the core part according to the embodiment, and shows a conceptual configuration diagram in a state where secondary windings (hereinafter also referred to as coils) 15 a and 15 b are wound around the core part 10. . Insets (a) and (b) show top and bottom side views of the core cores 10a and 10b. Here, 11a and 11b are joint portions between the core core material 10a and the core core material 10b. In the present embodiment, two coils 15a and 15b are wound 1000T (turns) on the left and right sides of the core portion 10, respectively, and the coils 15a and 15b are connected in series.

  In the present embodiment, since the winding structure composed of the core cores 10a and 10b and the coils 15a and 15b is symmetrical around the primary conductor (Z axis), the detection signal of the primary current is the left and right coils 15a, In addition to being added at 15b, since the magnetic flux due to the primary current is linked to each coil symmetrically (fairly) through the L-shaped core core material without leakage, the primary current can be detected appropriately. Further, the influence of the external magnetic field cancels out between the coils 15a and 15b, and is hardly affected by the external magnetic field.

  FIG. 3 is a diagram showing a winding method according to another embodiment, and shows another example in which windings are performed symmetrically. FIG. 3 (A) shows a case where the windings are vertically symmetric, and two coils 15c and 15d are wound up and down by 1000T on the top and bottom of the core part 10 respectively, and the coils 15c and 15d are connected in series. Yes. In the same manner as described above, the winding structure composed of the core cores 10a and 10b and the coils 15c and 15d is symmetrical around the primary conductor, so that the primary current detection signal is added by the upper and lower coils 15c and 15d. At the same time, the magnetic flux due to the primary current is linked to each coil symmetrically without leakage through the L-shaped core material, so that the primary current can be detected properly. Further, the influence of the external magnetic field cancels out between the coils 15c and 15d, and is hardly affected by the external magnetic field.

  FIG. 3 (B) shows an example in which the windings are symmetric in four directions. The coils 15a to 15d are wound around four sides of the two core core members 10a and 10b, for example, by 500T, and between the coils 15a to 15d. Each is connected in series. Accordingly, the primary current can be properly detected in the same manner as described above, and is hardly affected by the external magnetic field. Further, since the winding is wound in all directions, the symmetry is further improved.

  The inventor has confirmed by the following experiment that the influence of the external magnetic field can be suppressed to the required level even when the two coils are symmetrically wound around the two L-shaped cores. This will be described below. FIG. 4 is an explanatory diagram of a test method for measuring the influence of an external magnetic field on the core portion. In FIG. 4A, 101 is a cylindrical bobbin, 102 is a coil wound around the bobbin 101, 103 is a signal source for applying an AC signal (60 Hz) to the coil 102, and 105 is set to an amplification degree (= 100). Amplifier circuit.

Rutotomoni inside to generate an alternating magnetic field H of the 400AT / m of the bobbin 101, the external magnetic field core assembly of the comparative example embodiment (which was subjected to winding to the core the core material) was placed in this Thus, the signal induced in the coil was taken out through the shield wire 104, and the signal waveform after amplification was measured. As the core assembly according to the present embodiment, two L-shaped core cores in which two coils are wound symmetrically are used, and as a core assembly of a comparative example, four strip core cores are used. The four coils were wound symmetrically.

  FIG. 4B shows a method for applying an external magnetic field. (A) of the figure shows the case where the core assembly is placed so that its central axis (corresponding to the Z-axis) is parallel to the magnetic field H (hereinafter referred to as coaxial). When rotated around the axis, a waveform having the largest signal amplitude was obtained. (B) in the figure shows the case where the core assembly is placed so that the central axis thereof is perpendicular to the magnetic field H (hereinafter referred to as orthogonal), and the core assembly is rotated around the X axis. In this case, the waveform having the largest signal amplitude was obtained.

  A practical target value of the influence of the external magnetic field is about 0.1 [mV] (rms) before amplification, and about 10 [mV] (rms) after amplification. Since the acquired waveform contains noise, it is necessary to see the magnitude of the fundamental wave (60 Hz).

Figure 5 is a graph showing the effect of an external magnetic field against the core assembly according to the embodiment, the figure shows a sketch view of a measurement signal containing a noise signal (after amplification). FIG. 5A shows the coaxial measurement result, and the signal component at 60 Hz is about 1 [mV] (rms). FIG. 5B shows the orthogonal measurement result, and the signal component at 60 Hz is about 5 [mV] (rms).

  FIG. 6 is a graph showing the influence of the external magnetic field on the core assembly of the comparative example. FIG. 6A shows the measurement result in the case of the coaxial, and the signal component at 60 Hz is about 5 [mV] (rms). FIG. 6B shows a measurement result in the case of orthogonality, and the signal component at 60 Hz is about 4 [mV] (rms).

As described above, even a simple configuration wound symmetrically two coils into two L-shaped core core material in the present embodiment, the target value 10 of the practical effects of the external magnetic field [mV] ( rms) and significantly lower than the conventional comparative example.

<Example>
Hereinafter, the Example at the time of applying the core part (L-shaped core core material) of this invention to a split type current transformer is described in detail. FIG. 7 is a perspective view of the core portion of the split type current transformer of the embodiment. A large number of L-shaped plate magnetic pieces are alternately bundled in the same manner as described above with reference to FIG. 1 and temporarily fixed with a tape to form two core core members 10a and 10b. Since the two sides of the L-shaped core magnetic piece are orthogonal to each other, it is possible to easily align the comb-like joint portions 11a and 11b at both ends simply by overlapping a plurality of sheets and aligning the orthogonal portions (corner portions). it can. The core core materials 10a and 10b obtained in this way are detachably assembled so as to form a rectangular ring as a whole by meshing the long sides with the respective joints 11a and 11b so as to be in surface contact with each other.

FIG. 8 is a perspective view of the split type current transformer of the embodiment when the secondary winding (coil) is mounted. Bobbins 20a to 20d made of resin are fitted on the four sides of the core cores 10a and 10b. Each of the bobbins 20a to 20d includes a rectangular cylindrical body 21 and flange portions 22 at both ends, and the inner peripheral surface of the body 21 can stably hold (fix) the laminated state of the core core materials 10a and 10b.

  In this example, coils (secondary windings) 15a and 15b are wound only on the left and right bobbins 20a and 20b, and no coils are wound on the upper and lower bobbins 20c and 20d. The coils 15a and 15b are wound in advance outside, and an insulating tape is stuck on the coils. Lead wires 16 are connected to both ends of the coil 15a, and the lead wires 16 are taken out from notches 24 provided in the flange portion 22. The same applies to the coil 15b. And the connection between each coil is performed by connecting between each lead wire 16.

  Further, the flange portion 22 has a hole 23 for collectively positioning and fixing the bobbins 20a to 20d by fitting convex pins erected on inner walls of outer cases 40a and 40b made of resin, which will be described later. Is provided. Thus, two core assemblies 30a and 30b composed of two L-shaped core core materials and secondary windings are obtained. Moreover, when these are joined so as to form a rectangular ring, the core assembly 30 is obtained.

FIG. 9 is a perspective view of the split type current transformer of the embodiment in a shield mounting state. In the present embodiment, the L-shaped core assemblies 30a and 30b are covered with the L-shaped shield members 25a and 25b, so that the entire core assembly 30 can be efficiently shielded. Hereinafter, the shielded core assembly is also referred to as a core assembly 30A. The L-shaped shield member has a small number of parts and can easily be produced with good shielding characteristics. For example, as shown in the inset (a), for example, a permalloy plate member can be easily punched out as shown in the drawing and bent at the position of the dotted line. Further, since the L-shaped shield members 25a and 25b may be joined at two locations, the core assembly 30A can be effectively shielded from the external magnetic field by a simple operation. Further, each of the shield members 25a and 25b is provided with eight through holes 26, and the through holes 26 communicate with the flange holes 23 of the core assemblies 30a and 30b. The hole 27 is a hole for taking out the lead wire 16 to the outside.

  FIG. 10 is an assembled perspective view of the outer case of the split type current transformer of the embodiment. The outer case 40 is made of a resin molding, and includes a front case 40a on the front side and a back case 40b on the back side. An opening 41a for penetrating the primary conductor is provided at the center of the front case 40a, and an opening 41b is provided at a corresponding position of the back case 40b.

  The front case 40a is divided into an upper half portion 45a and a lower half portion 46a at a hatched line A, and a rotating shaft 49a fixed to the lower right portion of the upper half portion 45a corresponds to the lower half portion 46a. The upper half 45a and the lower half 46a are pivotally supported so as to be openable and closable with the bearing 48a as a fulcrum. The same applies to the back case 40b. The rotation shaft 49b fixed to the upper half portion 45b rotates on the inner peripheral surface of the bearing portion 48b fixed to the lower half portion 46b, so that the bearing portion 48b is supported as a fulcrum. The upper half 45b and the lower half 46b are pivotally supported so that they can be opened and closed.

  Further, in the front case 40a, an upper left upper surface portion of the upper half portion 45a is provided with an operation portion 50a that a user operates with a finger when opening and closing the current transformer, and an upper left front surface portion includes an internal portion at the time of opening and closing. A protection member 53a for protecting the core joint portion 11a from contact with the external conductor is fixed. On the other hand, a locking portion 51a for receiving and locking the claw portion at the tip of the operation portion 50a is fixed to the upper left portion of the lower half portion 46a, and the primary conductor is caught in the lower right front surface portion. A biting prevention member 52a for preventing this is fixed. The same applies to the back case 40b, and these are provided at positions symmetrical to the front case 40a. The operation of these members will be described later.

  Further, eight arm portions 42 having inward claw portions at the front end portions thereof are provided on the four outer peripheral surfaces of the front case 40a, and the arm portions 42 are fitted to the corresponding positions of the back case 40b. A groove 43 that receives and locks the claw at the tip is provided. Further, the same arm portion 42 and groove portion 43 as those described above are also provided in the opening portion 41a on the front surface and the opening portion 41b on the back surface. Furthermore, eight convex pins 44 are erected on the inner wall of the back case 40b at positions corresponding to the eight through holes 26 of the shield member 25. The same applies to the front case 40a.

When assembling such a split type current transformer, first, the core assembly 30A covered with the shield member 25 is placed inside the back case 40b. At this time, the opening 41b of the back case 40b is fitted into the opening of the core assembly 30A, and the eight convex pins 44 pass through the eight through-holes 26 on the back surface of the shield member 25, respectively. It fits into the flange holes 23 of 30a, 30b. When the operator confirms this state and further pushes in the core assembly 30A, the core assembly 30A is fixed to the back case 40b. In this state, the shield member 25 and the bobbins 20a to 20d of the core assembly 30A are properly positioned and substantially fixed by the back case 40b. The joint portions 11a and 11b of the core assemblies 30a and 30b are detachably joined.

  Next, when the front case 40a is covered from above, the position is confirmed and the front case 40a is pushed in, the eight convex pins 44 on the inner wall of the back surface pass through the through hole 26 of the shield member 25 and fit into the internal flange hole 23. At the same time, the four outer peripheral surfaces of the front case 40a and the arm portions 42 provided in the opening 41a are fitted into the corresponding groove portions 43, and the claw portions at the leading ends engage with the back surface of the groove portion 43. . Thus, the inner core assembly 30A is held and fixed in an appropriate state by the outer case 40. In this state, the upper half portions 45a and 45b and the lower half portions 46a and 46b of the outer case 40 are connected to their respective arms. The upper half 45 and the lower half 46 are opened and closed integrally with each other thereafter.

  FIG. 11 shows an external perspective view of the split type current transformer 60 of the embodiment. When the current transformer 60 is attached to the primary conductor, the user can easily divide the upper half portion 45 and the lower half portion 46 by a one-touch operation in which the user simply flips the tip of the operation portion 50 with a finger. .

  FIG. 12 is an external perspective view of the divided current transformer of the embodiment in a divided state. The upper half 45 and the lower half 46 of the current transformer have an opening with a structure including a bearing 48 and a rotating shaft 49 as a fulcrum, and a primary conductor (not shown) is opened at the central opening 41. It is possible to pinch. In that case, the core members 10a are protected by the protective members 53a and 53b so that the end portions (corresponding to the joint portions 11a) do not touch the primary conductor. Moreover, it protects with the protection convex pieces 54a and 54b so that the edge part of the core core material 10b may not touch a primary conductor.

Thus, when the current transformer 60 is closed after the primary conductor is sandwiched inside the opening 41, the tip portions of the biting prevention members 52a and 52b are brought into contact with the abdomen of the primary conductor, so that the primary conductor Protect from biting. Further, the inner side surfaces of the protective members 53a and 53b slide on the outer side surfaces of the protective convex pieces 54a and 54b , so that the end of the core core material 10a and the end of the core core material 10b are securely engaged and joined. To guide. Thus, when the current transformer 60 is completely closed, the claw portion of the operation portion 50 engages with the locking portion 51.

  In each of the above-described embodiments, the shape of the core portion when viewed from the front is square, but is not limited thereto. The shape of the core portion viewed from the front may be a rectangular of any size.

  Moreover, although the application example to the split type current transformer of the L-shaped core core material was described in the above embodiment, the present invention is not limited to this. You may use it as a non-dividing type current transformer by providing so that it may fix after joining the junction parts 11a and 11b of L-shaped core core material.

It is explanatory drawing of the core part of the current transformer by embodiment. It is a figure which shows the winding method of the core part by embodiment. It is a figure which shows the winding method of the core part by other embodiment. It is explanatory drawing of the test method which measures the influence of the external magnetic field with respect to a core part. It is a graph of the measurement result of the core part by embodiment. It is a graph of the measurement result of the core part of a comparative example. It is a perspective view of the core part of the split type current transformer of an Example. It is a perspective view of the secondary winding mounting state of the split-type current transformer of an Example. It is a perspective view of the shield mounting state of the split-type current transformer of an Example. It is an assembly perspective view of the outer case of the split type current transformer of an example. It is an external appearance perspective view of the split type current transformer of an Example. It is an external appearance perspective view of the division | segmentation state of the division | segmentation type current transformer of an Example.

Explanation of symbols

10 Core part
10a, 10b core core material
11a, 11b joint
15a-15d secondary winding (coil)
20 Bobbin 22 Flange part 23 Hole 25 Shield member 26 Through hole 30 Core assembly 40 External case 41 Opening part 42 Arm part 43 Groove part 44 Convex pin 48 Bearing part 49 Turning shaft 50 Operation part 51 Locking part
52a, 52b biting prevention member
53a, 53b protective member
54a, 54b protective convex piece 60 split type current transformer

Claims (7)

Only the L-shaped magnetic plate pieces are laminated, and the two core core members fitted in at least one bobbin and maintained in the laminated state are combined to form a rectangular ring as a whole, and the two core core members are combined . A core part that is detachable at the joint part ;
A secondary winding wound around the two core cores ,
A current transformer characterized by that. The current transformer according to claim 1,
The plate magnetic piece has a long side corresponding to a long side and a short side corresponding to a short side,
Wherein said long side portion and the core the core in the laminating direction of the plate magnetic piece with the short side portion are alternately laminated, the core portion is long sides portions of said two core core the plate Combined to mesh with each other in the stacking direction of the magnetic pieces ,
It shall be the features a strange Nagareki. The current transformer according to claim 2,
When the length of the long side portion of the plate magnetic piece is a, the length of the short side portion is b, and the plate width is c, there is a relationship of a = b + c .
It shall be the features a strange Nagareki. A current transformer according to any one of claims 1 to 3,
Said secondary winding is wound in at least one each of the two core core,
It shall be the features a strange Nagareki. A current transformer according to claim 4,
It said secondary winding is wound symmetrically to the two cores core,
It shall be the features a strange Nagareki. A current transformer according to claim 4 or claim 5, wherein
The two cores first axis capable divided into two fulcrum which is the boundary of the joining portion of the core member corresponding to one of said joint portions includes a second outer casing,
Wherein each core core is supported respectively by said first and second external casing,
It shall be the features a strange Nagareki. The current transformer according to claim 6,
A bobbin that holds the core core material inserted therein;
The bobbin is supported by convex pins provided integrally on the inner walls of the first and second outer cases ,
It shall be the features a strange Nagareki.

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