JP6554271B2 - Semi-empty reactor - Google Patents

Description

  The present invention relates to a half air core reactor used for direct current large current of an electric railway or the like.

  In the DC railway substation of the electric railway, AC power is converted to DC power and power is supplied. For example, a silicon rectifier for direct current feed is used for this power conversion, but in recent years, the impedance of the silicon rectifier has become low, and when a ground fault occurs near a substation, an excessive short circuit current flows There was a trend.

  Therefore, conventionally, a gap iron core type reactor or an air core reactor is used to suppress a short-circuit current at the time of a ground fault and prevent an accident from spreading (see, for example, Patent Document 1).

JP 2009-177012 A

  However, in the gap core type reactor, when the short circuit current flows, the core saturates and the inductance is reduced to about 30%, and the short circuit current limiting current effect as expected may not be obtained. Although it is possible to secure, for example, 50% or more of the inductance at the time of short-circuit current application by extremely reducing the magnetic flux density, in this case, it is necessary to significantly increase the iron core usage. Significant increases and cost increases are inevitable.

  On the other hand, since the air core reactor does not have an iron core, the above-described reduction in the inductance due to iron core saturation does not occur, and a high current limiting effect can be obtained even when the short circuit current is applied. However, an air core reactor with an inductance value adapted to the current limiting function is difficult to exert a high harmonic suppression effect at the time of rated energization, and is also inferior in the ability to shut off the degree of rated current that occurs frequently. Yes. If inductance is increased, it is possible to obtain harmonic suppression effect and rated breaking current suppression effect at rated energization in a feeding substation, but in this case, it is necessary to take measures such as increasing the number of coil turns, After all, this will lead to an increase in weight, product size and cost.

  Then, this invention aims at provision of the half air core reactor which was small and was excellent in the current limiting effect while ensuring sufficient inductance at the time of rated conduction and short circuit current conduction.

  In order to solve the above problems, the half-air-core reactors 1, 2, 3 of the present invention are provided with coils 11, 21, 31 and substantially annular magnetic bodies 13, 23, 33, and the coils 11, 21, 31 The coils 11, 21, 31 are disposed in the hollow portions 13a, 23a, 33a of the magnetic members 13, 23, 33 so that the axial direction and the axial direction of the magnetic members 13, 23, 33 are orthogonal to each other. It is characterized by having.

A lead wire 22 extends from the radial end of the coil 21 along the axial direction of the coil 21, and the magnetic body 23 has a lead wire 22 in a portion facing the lead wire 22. Preferably, a lead-out portion 24 is provided to avoid contact with the body. Alternatively, the axial length L of the magnetic body 33 is smaller than the diameter R of the hollow portion 31a of the coil 31.
It is preferable that the coil 31 be disposed in the hollow portion 33 a of the magnetic body 33 so that the hollow portion 31 a of the coil 31 and the inner circumferential surface of the magnetic body 33 face each other. One or more gaps may be provided in a part of the magnetic path formed by the magnetic bodies 13, 23, 33.

  In the half air core reactor of the present invention, the coil is disposed in the hollow portion of the magnetic body so that the axial direction of the coil and the axial direction of the magnetic body are orthogonal to each other. The core does not saturate at the time of current application and the inductance does not fall to about 30%, and it can not ensure the required inductance at the time of rated application as in the air core reactor. Sufficient inductance can be ensured at any time. That is, although the magnetic substance contributes to increase of the inductance at the time of rated conduction, it is disposed so as to suppress the extreme drop of the inductance at the time of short circuit current conduction, so the iron core usage amount is simply increased. Compared with the case where the number of coil turns is increased, the size and weight can be reduced and the cost can be reduced.

  Further, by providing the magnetic body with a lead-out portion for avoiding contact with the lead wire, it is not necessary to draw the lead wire outside along the space between the coil and the magnetic body, and the coil and the magnet The body can be placed in close proximity.

  In addition, since the axial length of the magnetic body is smaller than the diameter of the hollow portion of the coil, the portion of the axial end portion of the coil that does not face the inner peripheral surface of the magnetic body is the inner periphery of the coil. It will also occur on the side. Therefore, when extending the lead wire, it is possible to extend the lead wire while avoiding the facing of the inner peripheral surface of the magnetic material, and the coil and the magnetic material can be arranged close to each other.

  Furthermore, by providing a gap in the magnetic path formed of the magnetic material, adjustment of the inductance can be easily performed.

It is a perspective view which shows the half air core reactor which concerns on one Embodiment of this invention. Similarly, the half air core reactor is shown, (a) is a plan view, (b) is a front view, and (c) is a side view. It is a perspective view which shows the semi-air core reactor which concerns on different embodiment. Similarly, the half air core reactor is shown, (a) is a plan view, (b) is a front view, and (c) is a side view. It is a perspective view which shows the half air core reactor which concerns on another embodiment. Similarly, the half air core reactor is shown, (a) is a plan view, (b) is a front view, and (c) is a side view.

  Next, an embodiment of a half air core reactor of the present invention will be described in detail based on the drawings. As shown in FIG. 1 and FIG. 2, the half air core reactor 1 of the present invention is composed of a coil 11 and a magnetic body 13 disposed so as to surround the coil 11.

  The coil 11 is formed in, for example, a cylindrical shape having a hollow portion 11a as shown in FIG. 2 by winding a plurality of flat wires around an axis. Further, two lead wires 12, 12 are drawn out from the outer peripheral side and the inner peripheral side of the coil 11. Specifically, the lead wire 12 on the outer peripheral side is extended upward along the outer surface of the coil 11 from the lower axial end in FIG. 1. Further, the lead wire 12 on the inner peripheral side is an axial end portion on the upper side in FIG. 1 and extends upward from the vicinity of the hollow portion 11 a.

  As shown in FIGS. 1 and 2, the magnetic body 13 is formed in a substantially annular shape having a hollow portion 13a. This is formed, for example, by overlapping silicon steel having a thickness of 0.2 mm to 0.5 mm in the thickness direction, but may be formed by various known methods.

  As shown in FIGS. 1 and 2, the axial direction of the coil 11 and the axial direction of the magnetic body 13 are orthogonal to each other, both axial ends of the coil 11, the inner peripheral surface of the magnetic body 13, and Are disposed opposite to each other, and the half air core reactor 1 is configured by arranging the coil 11 in the hollow portion 13a of the magnetic body 13 without inserting the magnetic body 13 in the hollow portion 11a of the coil 11. . Moreover, although the clearance gap is provided between the upper and lower surface of the coil 11 and the magnetic body 13, it is preferable to make this clearance gap 5 mm or more. If the gap is less than 5 mm, the amount of increase in inductance is increased, but insulation between the coil 11 and the magnetic body 13 becomes difficult. Further, as shown in FIG. 2C, the lead wire 12 is appropriately bent so as not to touch the coil 11 and the magnetic body 13, and is drawn out through the gap between the coil 11 and the magnetic body 13. ing.

  For example, considering the required value of 1.1 mH at rated current conduction and 0.5 mH at short circuit current current, in the half air core reactor 1 with the above configuration, the inductance at the rated current conduction is It is possible to secure about 1.1 mH in both of the increment and the high harmonic suppression effect at the time of rated energization. Further, when the short circuit current is applied, an inductance of about 0.5 mH can be secured by the coil 11 alone, and a high current limiting effect of the short circuit current can be obtained. As described above, the magnetic body 13 contributes to increase of the inductance at the time of rated conduction, and is arranged to suppress the reduction of the inductance at the time of conduction of the short circuit current, so the amount of iron core used is simply increased. Compared to the case where the number of turns of the coil is increased, the size and weight can be reduced (the weight can be reduced by 20 to 30%) and the cost can be reduced.

  3 and 4 show a half air core reactor 2 of another embodiment of the present invention. The half air core reactor 2 of this different embodiment is an inner peripheral surface of the magnetic body 23 facing the axial end of the coil 21 as shown in the figure, and the radial end of the coil 21 (specifically, And the lead wire 22 can be drawn outside while avoiding contact with the lead wire 22 in a portion facing the lead wire 22 extended along the axial direction of the coil 21 from the end on the inner diameter side of the coil 21 A drawer portion 24 communicating with the inside and outside is provided.

  In the case of the previous embodiment, since the magnetic body 13 is positioned to face the lead wire 12 extended upward from one end of the coil 11, in order to pull out the lead wire 12, the lead It was necessary to bend the wire 12 and pass the gap between the coil 11 and the magnetic body 13 and to widen the opening width OH of the hollow portion 13a of the magnetic body 13 by that amount. In this case, since the lead-out portion 24 is provided, the lead wire 22 can be drawn out through the lead-out portion 24 without bending the lead wire 22. Therefore, it is not necessary to widen the opening width OH of the hollow portion 23a of the magnetic body 23, the coil 21 and the magnetic body 23 can be disposed closer to each other, and the increase amount of the inductance can be increased.

  5 and 6 show another embodiment of the present invention. In the semi-air core reactor 3 of this further different embodiment, the axial length L of the magnetic body 33 is made smaller than the diameter R of the hollow portion 31a of the coil 31, as shown in the figure. Then, in order to make the inner peripheral surface of the magnetic body 33 face the hollow portion 31 a of the coil 31, in other words, the axial center of the coil 31 and the center in the axial direction of the magnetic body 33 intersect. Is disposed in the hollow portion 33 a of the magnetic body 33.

If the axial length L of the magnetic body 33 is shortened in this way, a portion that does not oppose the inner peripheral surface of the magnetic body 33 at the axial end portion of the coil 31 also occurs on the inner peripheral side of the coil 31. The lead wire 32 can be extended so as not to face the body 33, and it is not necessary to provide the lead portion 24. Further, if the cross-sectional area S of the magnetic body 33 is made uniform and the width H and axial length L of the magnetic body 33 are appropriately changed, the performance at the time of rated energization and short circuit current energization can be maintained. In addition, the lead wire 32 can be easily pulled out, the degree of freedom in connection with an external device is increased, and versatility is improved.

  As mentioned above, although typical embodiment of this invention was described, this invention is not limited to the said embodiment, It is possible to change variously within the scope of this invention, and to carry out.

  For example, the inductance can be easily adjusted by providing one or a plurality of gaps in a part of the magnetic path formed by the magnetic bodies 13, 23, and 33 and changing the size of the gaps. Further, the magnetic bodies 13, 23, 33 may be divided into a plurality of parts, for example, the magnetic bodies which are substantially square when viewed from the front may be divided for each side. In this case, the dimensions of the individual members are reduced, and the weight is also dispersed, so that it can be carried into a narrow place, facilitating assembly work and installation work.

  Further, as shown in FIGS. 3 and 4, the lead-out portion 24 is formed in a hole shape by removing a part of the magnetic body 23, but it is formed by cutting out a part of the magnetic body. May be. Moreover, the shape may be variously changed as long as the lead wire can be inserted without contacting the magnetic body. Further, in FIGS. 3 and 4, the lead portion 24 is provided only for the lead wire 22 extending from the inner diameter side end portion of the coil 21, but the axial length of the magnetic body 23 and the coil 21 Depending on the positional relationship, the lead-out portion 24 may be provided to the lead wire 22 extended from the end on the outer diameter side of the coil 21.

  1, 2, 3 · · · half-air core reactor, 11, 21, 31 · · · coil, 12, 22, 32 · · · lead wire, 13, 23, 33 · · magnetic body, 13a, 23a, 33a · · hollow portion, 24 ... lead portion, the hollow portion of the opening width of the OH · magnetic, L ... magnetic axial length of the diameter of the hollow portion of the R .. coil

Claims (5)

The magnetic body (33) includes a coil (31) and a substantially annular magnetic body (33), and the axial direction of the coil (31) and the axial direction of the magnetic body (33) are orthogonal to each other. A DC half-core reactor in which the coil (31) is disposed in the hollow portion (33a) of
The axial length (L) of the magnetic body (33) is smaller than the diameter (R) of the hollow portion (31a) of the coil (31), and the hollow portion (31a) of the coil (31) The coil (31) is disposed in the hollow portion (33a) of the magnetic body (33) so as to face the inner peripheral surface of the magnetic body (33) .
A lead wire (32) extends from the inner diameter side end of the coil (31), and the entire lead wire (32) has a larger inner diameter than the end on the outer diameter side of the coil (31) in plan view. The semi-air-core reactor is located on the outer side and located outside the axial end of the magnetic body (33) . The semi-air-core reactor according to claim 1, wherein the lead wire (32) extends straight from an inner diameter side end of the coil (31) along the axial direction of the coil (31). The semi-air-core reactor according to claim 1 or 2 , wherein a single or plural gaps are provided in a part of a magnetic path formed by the magnetic body (33). The half air core reactor according to any one of claims 1 to 3, wherein the magnetic body (33) is formed by stacking 0.2 to 0.5 mm of silicon steel in a thickness direction. The half air-core reactor according to any one of claims 1 to 4 , wherein an inductance of 1.1 mH at the time of rated energization and 0.5 mH at the time of short-circuit current energization is secured.

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