JP5196475B2 - Collision type dry transformer - Google Patents

Description

  The present invention relates to an abutting dry transformer, and more particularly to a cooling structure for the transformer.

  An abutting transformer in which leg iron cores having a circular cross section around which an input coil and an output coil are wound is arranged in a triangular shape or a straight line, and the upper and lower surfaces of each leg iron core are abutted and connected by a yoke core is well known. is there. FIGS. 4 to 6 show an example of such a three-phase abutting dry transformer. In FIGS. 5 and 6, 1a, 1b, and 1c are circular in cross section or pseudo-circular, and centered on the circular shape. Leg iron core formed with a through hole for inserting a bolt, 2a is an outer triangular upper yoke core, 2b is an outer triangular lower yoke core, 3a is a conductive coil portion wound around the leg iron core 1a, and 3b is a leg iron core 1b. The conductive wire coil portion wound around the lead iron core 1c, 4 is a container, 5 is a wind tunnel plate, 6 is an exhaust fan, and 7 is a vent hole.

As shown in FIG. 6, the transformer main body has leg iron cores 1 a, 1 b, 1 c wound with conductive coils arranged in a triangular shape, and the upper and lower end surfaces of the leg iron cores 1 a, 1 b, 1 c arranged in a triangular shape, respectively. Further, the outer triangular triangular yokes 2a, 2b are abutted and fixed by bolts (not shown) penetrating the leg iron cores 1a, 1b, 1c.
Japanese Utility Model Publication No. 62-30317 JP-A 48-57161

As shown in FIG. 5, the transformer is configured by housing the transformer body in a container 4. A wind tunnel plate 5 having a hole surrounding the transformer main body is disposed in the container, and an exhaust fan 6 is provided on the upper surface of the container 4. The transformer body housed in the container 4 introduces air from the ventilation holes 7 provided in the lower side wall of the container 4 by driving the exhaust fan 6 and guides the air through the wind tunnel plate 5 to pass through the transformer body. The transformer body is cooled by the flow.

FIG. 4 shows the configuration of the conductor coil portions 3a, 3b, 3c wound around the leg iron cores 1a, 1b, 1c of this transformer as a representative of the leg iron core 1a, and 3a1 is an input coil (primary coil). Reference numeral 3a2 denotes an output coil (secondary coil), in which the primary coil 3a1 and the secondary coil 3a2 each have two layers. Reference numeral 8 is an insulating paper made of an aramid film, 9 is an insulating spacer, and 10 is an incompatibility preventing plate made of a cylindrical copper plate that electrically isolates the primary coil 3a1 and the secondary coil 3a2. A plurality of insulating spacers 9 are positioned at a predetermined interval in the circumferential direction of the leg iron core 1a, and a gap extending in parallel with the leg iron core 1a between adjacent insulating spacers 9 is used as a cooling air passage. The cooling air introduced from the ventilation hole 7 is allowed to flow through, and the transformer body is cooled by the flow.

Thus, conventionally, in order to cool the transformer body, the insulating spacer 9 is arranged between the leg iron core 1a and the primary coil 3a1, between the primary coils 3a1, between the primary coil 3a1 and the secondary coil 3a2, and between the secondary coils 3a2. For this reason, there has been a problem that the coil diameter is inevitably increased and the transformer becomes larger, and the diameter of the conductive coil is large and a large amount of guided dose is required.

The problem to be solved by the invention is to make it possible to reduce the size without reducing the cooling efficiency of the abutting dry transformer, and to solve such a problem.

In the present invention, a leg iron core having a circular cross section in which an input coil and an output coil are wound via an anti-contact plate is arranged, and an upper surface and a lower surface of each arranged leg iron core are abutted and connected by a yoke core. In the combined dry transformer, a cylindrical body obtained by spirally winding a thin hollow conductor tube in which the anti-contact plate is insulated, and a fluid cooled in the hollow of the hollow conductor tube is passed through the anti-incompatible plate, Insulating paper made of a polyimide film coated with a solvent-free insulating adhesive on the entire surface is inserted between the coils and between the coils.

In the present invention, a thin hollow conductor tube in which an incompatibility preventing plate disposed between the input coil and the output coil is insulated is a spirally wound cylindrical body, and a cooling fluid such as water or oil is placed in the hollow of the hollow conductor tube. Since it flows, the cooling capacity is improved, and insulating paper made of a polyimide film coated with a solvent-free insulating adhesive on the entire surface is disposed between the anti-contact plate and each coil and between each coil. Therefore, heat generated from the coil can be efficiently conducted to the anti-contact plate, and a spacer disposed between the coil layers can be omitted. Thereby, the diameter of a coil can be made small, the usage-amount of conducting wire is reduced, and a transformer can be reduced in size.

For the purpose of enabling downsizing without reducing the cooling efficiency of the abutting dry transformer, a cooling medium passage is formed in the anti-contact plate arranged between the input coil and the output coil, Also, an insulating paper made of a polyimide film coated with a solventless insulating adhesive that does not generate bubbles between the coils and between the coils and between the coils is inserted into the cooling medium flow hole. Realized by passing cooling fluid such as oil or oil.

FIG. 1 is a cross-sectional view showing a configuration of a conductive wire coil portion wound around a leg core of an abutting dry transformer according to the present invention. In FIG. 1, 1a is a leg-shaped core having a circular cross section, 2a and 2b are yokes, 3a1 is an input coil (primary coil), 3a2 is a first output coil (secondary coil), and 3a3 is a second output coil ( (Tertiary coil), 11 is an insulating paper made of polyimide film, 12 is an incompatibility preventing plate, and 13 is a solventless insulating adhesive layer coated on the entire surface of the insulating paper 11.

The insulating paper 11 is wound around the leg iron core 1a, the first layer of the second output coil 3a3 is wound thereon, and the insulating paper 11 coated with the solvent-free insulating adhesive layer 13 is wound on the both sides, and the second output Wind the second layer of the coil 3a3. An insulating paper 11 coated with a solvent-free insulating adhesive layer 13 on both sides is wound on the second layer of the second output coil 3a3, and an anti-mixing plate 12 is disposed on the insulating paper 11, and a solvent-free insulating adhesive is provided. The insulating paper 11 coated with the layer 13 on both sides is wound, the first layer of the input coil 3a1 is wound, and the insulating paper 11 coated with the solvent-free insulating adhesive layer 13 is wound thereon, and the input coil 3a1 is wound. Roll the second layer. Hereinafter, the insulating paper 11 coated with the solventless insulating adhesive layer 13 on both sides is wound with the anti-coating plate 12 and the insulating paper 11 coated with the solventless insulating adhesive layer 13 on both sides is wound. The first layer of the output coil 3a2 is wound, the insulating paper 11 coated with the solvent-free insulating adhesive layer 13 on both sides is wound thereon, and the second layer of the first output coil 3a2 is wound. 11 is wound and a coil part is created. In this embodiment, the second output coil 3a3 is provided, but the number of output coils is appropriate.

The intrusion prevention plate 12 is formed of a thin hollow conductor tube 12a that is insulated, and is formed into a cylindrical body by spirally winding it. In this case, the hollow conductor tube 12a is wound between the output coils 3a3 and 3a2 and the input coil 3a1, and a potential difference is generated at both ends of the cylindrical body, which may be inconvenient as an anti-contact plate. At this time, as shown in FIG. 2, the hollow conductor tube 12a spirally wound is divided into two with the same number of turns of the upper cylindrical body 12b and the lower cylindrical body 12c, and the hollow conductor tube positioned at the upper cylindrical body 12b. If the winding direction of the tube 12a and the winding direction located in the lower cylindrical body 12c are wound in opposite directions and electrically connected at the center, the potentials at both ends of the cylindrical body become the same potential. In addition, although the hollow conductor tube 12a spirally wound is divided into two parts, an upper cylindrical body 12b and a lower cylindrical body 12c, it may be divided more, and in this case, if divided into an even number, the hollow conductor tube 12a is hollow. The upper and lower ends of the cylindrical body formed by spirally winding the conductor tube 11e can have the same potential.

During operation of the abutting dry transformer having the anti-contact plate 12, a cooled fluid such as water or oil is allowed to flow through the hollow conductor tube 12a. The contact prevention plate 12 is cooled by the flow of the cooling fluid, and the input coil 3a1 and the output coils 3a2, 3a3 are cooled by the cooling. In this case, the insulating paper 11 made of a polyimide film coated with a solvent-free insulating adhesive layer 13 disposed between the conductors on both sides has a low heat insulation effect and a high thermal conductivity, so that the cooling effect can be enhanced. . Although not shown, the fluid that has flowed through the hollow conductor tube 12a circulates in the cooler and flows into the hollow conductor tube 12a.

FIG. 3 shows an anti-contact plate 12 of another reference example. The anti-contact plate 12 of this example has a hollow inside as shown in FIG. 3 and divides the circumferential direction (inducted current). The cylindrical body 12e having an opening 12d is formed, and openings 12f and 12g communicating with the inside of the hollow are formed on the upper and lower end surfaces in a direction parallel to the central axis of the leg iron core 1a. Such a cylindrical body 12e is formed by, for example, laminating another rectangular copper plate on the convex portion and integrating it with a rectangular copper plate having a low convex portion at the peripheral edge, and a convex portion on one side, Openings 12f and 12g are formed in each of the convex portions on the other side facing the convex portions by a drill or the like, and are formed by deforming them into a cylindrical shape. In addition, you may make it form a some through-hole with a drill etc. in the thickness of the cylindrical body 12e.

During the operation of the contact-type dry transformer having the incompatibility prevention plate 12, a cooled fluid such as water or oil is injected into the hollow interior of the cylindrical body 12e from the opening 12g at the lower end surface of the cylindrical body 12e. The fluid injected into the hollow is discharged from the opening 12f on the upper end surface of the cylindrical body 12e. The cylindrical body 12e is cooled by the flow of the cooling fluid, and the input coil 3a1 and the output coils 3a2, 3a3 are cooled by the cooling.

It is sectional drawing which shows the structure of the conducting wire coil part wound around the leg iron core of the abutting type dry transformer which concerns on the Example of this invention. FIG. 2 is a side view of an intrusion prevention plate of the abutting dry transformer shown in FIG. 1. It is a perspective view of the other intrusion prevention board which concerns on the Example of this invention. It is sectional drawing which shows the structure of the conducting wire coil part wound around the leg iron core of the conventional abutting type dry transformer. It is explanatory drawing of an abutting type dry type transformer. It is a top view which shows an example of arrangement | positioning of the iron core of an abutting type dry transformer.

Explanation of symbols

1a, 1b, 1c Leg iron core 2a 2b yoke core 3a1 input coil 3a2 first output coil 3a3 second output coil 11 insulating paper 12 incompatibility plate 12a hollow conductor tube 12e cylindrical body 13 solvent-free insulating adhesive layer

Claims (2)

An abutment type dry transformer in which leg iron cores with a circular cross-section, in which an input coil and an output coil are wound through an anti-collision plate, are arranged, and the upper and lower surfaces of each arranged leg iron core are abutted and connected with a yoke core. A cylindrical body obtained by spirally winding a thin hollow conductor tube in which the anti-contact plate is insulated, and the fluid cooled in the hollow of the hollow conductor tube is allowed to flow between the anti-contact plate and each coil. And an abutting dry transformer characterized in that an insulating paper made of a polyimide film having a solvent-free insulating adhesive coated on the entire surface is inserted between the coils. A cylindrical body obtained by spirally winding an insulated thin hollow conductor tube is made up of an even number of cylindrical bodies spirally wound in the same number of turns in a reverse manner, and the ends of the adjacent cylindrical bodies are electrically connected. The abutting type dry transformer according to claim 1 .

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