JP4353751B2 - Three-phase five-leg wound core transformer - Google Patents

Description

  The present invention relates to an amorphous iron core transformer and a three-phase five-legged iron core transformer, and more particularly to a magnetic material and a structure of a wound iron core of the transformer.

The wound core transformer is made of either an amorphous ribbon or a silicon steel strip as a magnetic material. When the magnetic material is an amorphous ribbon, the amorphous ribbon becomes brittle by annealing in a magnetic field to remove the stress caused by the core forming of the amorphous ribbon. It is weak against the electromagnetic mechanical force. Therefore, as proposed in Patent Literature 1, the coils 3a and 3b are pressed and reinforced by the reinforcing members 4a and 4b as shown in FIG. Note that 2 is a wound iron core, fasteners 5a and 5b, and 6 is the direction of electromagnetic mechanical force.
JP-A-10-340815

  As described above, since the reinforcing members 4a and 4b are necessary only for the amorphous ribbon, the structure becomes large. For this reason, the assembly structure is complicated, and the man-hours and material costs for the assembly work are increased. Moreover, no load loss cannot be reduced if the magnetic material is only a silicon steel strip.

  The present invention solves the problems of the prior art, eliminates the need for a reinforcing material for holding the coil, makes the structure compact, reduces the man-hours and material costs for assembly work, and the magnetic material is a silicon steel strip. It is an object of the present invention to provide an amorphous wound core and a three-phase five-leg wound core transformer that can reduce no-load loss more than the case of only the case.

  In order to solve the above-mentioned problems, the present invention basically has a structure in which an amorphous thin ribbon and a silicon steel strip are simultaneously used as a magnetic material of a wound core in a three-phase five-leg wound core transformer. Specifically, in a three-phase five-leg wound core transformer, the wound core 1 linked only to the outer one coil 3a is a silicon steel strip, and the central wound core 2 linked to the two coils 3a, 3b. Is a structure that forms an amorphous ribbon.

That is, the present invention relates to a three-phase five-leg wound core transformer including a plurality of coils arranged side by side and a plurality of magnetic material wound cores interlinked with the coils. An amorphous wound iron core is disposed so as to interlink with the other coil, and the coil disposed on the outermost side among the plurality of coils is wound only of a silicon steel strip so as to interlink with the outer portion of each coil. It is a three-phase five-leg wound core transformer in which an iron core is placed .

  According to the present invention, the reinforcing material for holding the coil is not required and the structure is made compact so that the number of man-hours and material costs for the assembly work are reduced, and the no-load loss is reduced as compared with the case where the magnetic material is a silicon steel band alone A three-phase five-legged iron core transformer can be obtained.

The best mode for carrying out the present invention will be described.
Hereinafter, embodiments of the amorphous iron core and the three-phase five-leg wound core transformer of the present invention will be described with reference to the drawings. FIGS. 1A and 1B are a plan view and a front view of a structure in which an amorphous thin ribbon and a silicon steel strip are simultaneously used as the magnetic material of the wound core in the three-phase five-leg wound core transformer of the embodiment. . 2A to 2C are a plan view, a front view, and a front view of a structural example of a conventional amorphous iron core transformer using only an amorphous ribbon as a magnetic material of a wound iron core in a three-phase five-legged iron core transformer. It is a perspective view. FIG. 3 is an explanatory diagram of the direction of the electromagnetic mechanical force of the coil at the time of a short circuit.

  Example 1 will be described. As shown in FIG. 1, the three-phase five-leg wound core transformer of the present embodiment includes coils 3a to 3c, a wound core 1 made of a silicon steel plate, and an amorphous core 2 made of an amorphous steel plate. The amorphous wound core 2 has a wound core 1 which is disposed adjacent to the winding radius direction and wound with a silicon steel strip on the outermost part in the winding radius direction.

  In the three-phase five-leg wound core transformer of the present embodiment, the wound core 2 made of an amorphous ribbon is increasingly embrittled by annealing in a magnetic field for removing stress caused by the core forming, and short-circuiting occurs. It is weak against the electromagnetic mechanical force of the coil at the time. In this case, the electromagnetic mechanical force of the coil is a force acting according to the law that conductors that pass current in the same direction at the time of a short circuit are attracted and conductors that flow current in the opposite direction repel each other, as shown in FIG. A radial force that attempts to widen the gap between the windings. For this reason, the conventional amorphous iron core transformer uses a wound iron core made of an amorphous ribbon and is weak against this electromagnetic mechanical force, and the iron core itself may be damaged. Therefore, as shown in FIG. 2, the coil 3a is pressed by the reinforcing members 4a and 4b to cope with the electromagnetic mechanical force of the coil at the time of a short circuit, resulting in a complicated structure. Further, the reinforcements 4a and 4b increase the lateral width of the amorphous iron core transformer, thereby inhibiting compactness. Therefore, as shown in FIG. 1, the three-phase five-leg wound core structure in this embodiment has a silicon steel strip as the outer wound core 1 that is linked only to one coil 3a, and is linked to two coils 3a and 3b. The central wound core 2 is inserted into a coil so as to form an amorphous ribbon. Thus, since the outer coil 3a is held down by the wound core 1 of the silicon steel strip, which is a rigid body, reinforcing members 4a and 4b are provided to resist the electromagnetic mechanical force at the time of a short circuit generated by the coil as shown in FIG. Even without it, it can counter the electromagnetic mechanical force. The central amorphous ribbon core 2 has the same structure as the conventional structure, and there is no problem with the electromagnetic mechanical force. Therefore, since the reinforcement members 4a and 4b are not necessary, the structure is simple and compact.

  Further, in this example, since the amorphous ribbon and the silicon steel strip are used at the same time as the magnetic material, the silicon steel strip is obtained by the effect of the low iron loss characteristic which is the greatest advantage of the amorphous ribbon. The no-load loss can be reduced as compared with the case of only the case.

The top view and front view of the three-phase five-leg wound core structure in the amorphous iron core transformer of an Example. The top view, front view, and perspective view of the three-phase five-leg wound core structure in the amorphous iron core transformer of a prior art example. Explanatory drawing of direction of the electromagnetic mechanical force of the coil at the time of a short circuit.

Explanation of symbols

1 Rolled iron core (silicon steel strip)
2 Rolled iron core (amorphous ribbon)
3a Coil (outside)
3b Coil (center)
4a Reinforcement 1
4b Reinforcement material 2
5a Fastener (top)
5b Fastener (bottom)
6 Direction of electromagnetic mechanical force

Claims (1)

In a three-phase five-leg wound core transformer comprising a plurality of coils arranged side by side and a plurality of magnetic material wound cores interlinked with the coils ,
Each adjacent coil has an amorphous wound core arranged so as to interlink with both of these coils,
A three-phase five-leg winding, wherein the outermost coil of the plurality of coils is provided with a wound iron core made of only a silicon steel band so as to be linked to the outer direction portion of each coil . Iron core transformer.

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