JP2011082387A - Static induction electrical apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase cooling efficiency of an iron core where a coil is wound in a static induction electrical apparatus. <P>SOLUTION: An insulating paper 13 consisting of a polyimide film all over whose surface a non-solvent insulating adhesive layer 14 is formed is wound about an iron core 11 with a cross-sectional circular shape on which an involute magnetic steel plate is radially laminated, whereupon an insulating conductor pipe 12 constituting a coil for applying AC voltage is wound, and refrigeration fluid is applied to the insulating conductor pipe. The polyimide film all over whose surface the non-solvent insulating adhesive layer 14 is formed is superior in thermal conductivity, and thus, the iron core is effectively cooled by the refrigeration fluid applied to the conductor pipe. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to cooling of a static induction device such as a transformer or a reactor, and more particularly to cooling of an iron core in a static induction device.

For example, in an abutting dry transformer, which is one of static induction devices, a cooling medium flow path is formed in an anti-contact plate arranged between the transformer input coil and the output coil, and the cooling medium flow path It has been considered to increase the cooling capacity by passing a cooling fluid such as water or oil, reduce the diameter of the coil to reduce the amount of conductors used, and reduce the size of the transformer. FIG. 4 shows a coil portion in such an abutting dry transformer. In FIG. 4, 1 is a leg-shaped core with a circular cross section, 2 is an insulating paper made of polyimide film, 3 is an input coil ( (Primary coil), 4 is a first output coil (secondary coil), 5 is a second output coil (tertiary coil), 6 is an anti-contact plate wound with a thin hollow conductor tube that has been insulated, and 7 is an insulating paper. 2 is a solventless insulating adhesive layer that is applied to the entire surface of 2 and does not foam when dried. That is, the insulating layer is formed by applying a solventless insulating adhesive on the entire front and back surfaces of the insulating paper 2.

Then, the insulating paper 2 is wound around the leg iron core 1, the first layer of the first output coil 4 is wound thereon, and the insulating paper 2 coated with the solventless insulating adhesive layer 7 on both sides is wound. The second layer of the output coil 4 is wound. The insulating paper 2 coated with a solvent-free insulating adhesive layer 7 on both sides is wound on the second layer of the second output coil 4, and an anti-mixing plate 6 is disposed on the insulating paper 2 to provide a solvent-free insulating adhesive. The insulating paper 2 with the layer 7 applied on both sides is wound, the first layer of the input coil 3 is wound, and the insulating paper 2 with the solventless insulating adhesive layer 7 applied on both sides is wound thereon, and the input coil 3 is wound. Roll the second layer. In the following, the insulating paper 2 coated with the solventless insulating adhesive layer 7 on both sides is wrapped with the anti-coating plate 6 and the insulating paper 2 coated with the solventless insulating adhesive layer 7 on both sides is wound. 2 is wound on the first layer of the output coil 5, the insulating paper 2 coated with the solvent-free insulating adhesive layer 7 is wound on both sides, and the second layer of the second output coil 5 is wound on the insulating paper. 11 is wound and a coil part is created.

A plurality of leg iron cores 1 with the coil portions thus formed are fastened and fixed to the yoke core 8 to produce a transformer body, and this transformer body is housed in a container through which cooling air is inserted to place the transformer. Finalize. During operation of this transformer, a cooled fluid such as water or oil is allowed to flow through the tube of the anti-contact plate 6. The contact prevention plate 6 is cooled by the flow of the cooling fluid, and the leg iron core 1 and the coils 4, 5, 6 are cooled by the cooling. In this case, the insulating paper 2 made of the solventless insulating adhesive layer 7 and the polyimide film disposed between the conductors has a low heat insulating effect and a high thermal conductivity, so that the cooling effect can be enhanced.

  In this case, as shown in FIG. 5, magnetic steel plates 9a curved in an involute curve shape (hereinafter referred to as involute magnetic steel plates) are radially stacked to create a circular cross section (in the illustrated example, these are stacked in three layers of ABC. If the iron core 9 having a substantially complete circular shape (with no step on the peripheral surface) made into a predetermined diameter is used as a leg iron core, the leg iron core has a small eddy current loss. Can be reduced.

JP 2009-206254 A JP 2009-105253 A

  However, when a voltage containing a large amount of high-frequency components is applied to the coil of the static induction device described above, even if an iron core in which involute magnetic steel sheets are radially laminated is used as the leg iron core, the heat generation of the leg iron core itself is greatly increased. There is a problem that the insulation may break down due to the heat of the leg iron core.

The problem to be solved by the invention is to improve the cooling efficiency of the leg iron core in the stationary induction device and to solve such a problem.

In order to solve the above-mentioned problems, the present invention provides a static induction device in which an insulated conductor wire is wound around an iron core having a circular cross-section in which involute magnetic steel plates are laminated radially, with an insulating layer interposed therebetween. Insulating paper with a solvent-free insulating adhesive coated on the entire front and back surfaces, and at least the insulated conductor wire wound closest to the iron core as an insulated conductor tube, and cooling fluid inside the insulated conductor tube It is configured to flow.

In the present invention, an insulating paper having a solvent-free insulating adhesive layer formed on the entire surface is wound around an iron core having a circular cross section in which involute magnetic steel plates are radially laminated, and an insulated conductor tube for applying an AC voltage is wound on the outer peripheral surface thereof. Since the cooling fluid flows through the inside of the conductor tube, the heat of the iron core is immediately transferred to the conductor tube through which the cooling fluid flows through the insulating paper on which a highly heat-conductive solvent-free insulating adhesive layer is formed. Thus, the cooling efficiency of the iron core can be increased, and a voltage containing a large amount of high-frequency components can be applied to the wound conductor tube (coil) with peace of mind.

It is a half sectional view of a coil of a static induction device concerning an example of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the structure of the stationary induction | guidance | derivation apparatus based on the Example of this invention, (a) is a top view, (b) is a side view, (c) is a connection diagram. It is a half cross-sectional view of a coil portion of a stationary induction device according to another embodiment of the present invention. It is a half cross-sectional view of a coil portion of a conventional static induction device. It is a perspective view of a leg iron core.

A stationary induction device (an example is a single-phase reactor) according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1, 11 is a leg core provided with a gap 11a, 12a is a first-layer wound conductor tube, 12b is a second-layer wound conductor tube, 12c is a fluid inlet flange, 12d is a fluid outlet flange, 13 is Insulating paper made of polyimide film, 14 is a solventless insulating adhesive layer. In addition, as shown in FIG. 5, the leg iron core 11 is formed in a cylindrical shape by laminating a large number of magnetic steel plates 11a having curved portions curved in an involute curve, and this is formed into a cylindrical shape. It is formed by layering (the number of steps is adjusted to the required diameter of the leg core).

A conductor (hereinafter referred to as an insulated conductor) tube in which an insulating paper 13 having a solvent-free insulating adhesive 14 coated on the entire front and back is wound around the leg core 11 and the outer peripheral surface made of copper or the like is insulated on the insulating paper 13. Is wound (12a), the insulating paper 13 is wound thereon, and the insulated conductor tube folded back on the wound insulating paper 13 is wound (12b) to form a monopod reactor. The fluid inlet flange 12c and the fluid outlet flange 12d are formed at the open ends on both sides of the conductor tube, the fluid inlet flange 12c is located at the start of winding of the first-layer wound conductor tube 12a, and the fluid outlet flange 12d is the second layer. It is located at the winding end of the winding conductor tube 12b.

That is, the most cooled fluid is caused to flow through the wound conductor tube 12 a closest to the leg iron core 11. In addition, if the insulating tape is coated with a solventless insulating adhesive as the conductor tube insulation, and the insulating tape is formed of a polyimide film, the cooling effect can be further enhanced. In addition, if an insulating tape with solvent-free insulating adhesive applied to the entire front and back is wound around a conductor tube, the conductor tube is simply wound around the leg iron core, and between the leg iron core and the conductor tube, An insulating layer made of insulating paper coated with a solventless insulating adhesive on the entire surface can be formed.

The leg iron core 11 to which the wound conductor tube 12a and the wound conductor tube 12b are mounted as described above is disposed between both end portions of the upper and lower yoke cores 15 and tightened as shown in FIGS. It is fixed. That is, the upper and lower yoke iron cores 15 and the leg iron cores 11 form a closed-shaped magnetic path. As shown in FIG. 2 (c), one end of the wound conductor tube wound around the leg core 11 on one side is connected to the input U terminal of the single-phase power source, and the other end is connected to the input V terminal of the single-phase power source. Connected. Similarly, one end of the wound conductor tube wound around the other leg iron core 11 is connected to the input U terminal of the single-phase power source, and the other end is connected to the input V terminal of the single-phase power source. The folded portion of the tube is connected to the input V terminal of the single-phase power source.

In the above embodiment, the insulated conductor tube has a circular cross section and is provided with a gap between the leg iron cores. However, as shown in FIG. It is good also as a leg iron core which does not provide. If the insulated conductor tube is a square copper tube 16, the electrical conductivity and the thermal conductivity are increased, and the flat surface of the square copper tube 16 is placed on the leg iron core via a solvent-free insulating adhesive layer and insulating paper. However, they can be brought into close contact with each other, the heat conduction area can be increased, and the cooling effect of the leg iron core can be further enhanced.

In addition, a conductor wire that is wound most closely to the iron core through an insulating paper in which a solvent-free insulating adhesive layer is formed on the entire surface of the iron core having a circular cross-section in which involute magnetic steel plates are laminated radially is used as a conductor tube. The present invention for cooling the iron core by flowing a cooling fluid through the conductor tube is not limited to a single-phase reactor, but can be applied to a three-phase or multi-phase reactor or a transformer. For example, in the case of the transformer shown in FIG. 4, at least the first layer coil of the first output coil 4 of the first layer may be a conductor tube, and the cooling fluid may be passed through the conductor tube.

11 Leg iron cores 12a, 22b, 16 Conductor tube winding 13 Insulating paper 14 Solvent-free insulating adhesive layer

Claims (5)

In a static induction device in which an insulated conductor wire is wound around an iron core having a circular cross-section in which involute magnetic steel plates are radially laminated with an insulating layer interposed, a non-solvent insulating adhesive is applied to the entire front and back surfaces of the insulating layer. A stationary induction device characterized in that it is made of insulating paper, and at least the insulated conductor wire wound closest to the iron core is used as an insulated conductor tube, and a cooling fluid is passed through the insulated conductor tube. . 2. The stationary induction device according to claim 1, wherein the insulating paper is a polyimide film. The stationary induction device according to claim 1 or 2, wherein the insulation treatment of the insulated conductor tube is a winding of an insulating tape coated with a solventless insulating adhesive. 4. The stationary induction device according to claim 3, wherein the insulating tape is a polyimide film. 5. The stationary induction device according to claim 1, wherein the insulated conductor tube is a rectangular insulated copper tube.

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