JPS6068609A - Insulating system for laminar winding - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulation system, in particular for layer windings of fluid-cooled transformers and choke coils, in which the conductors have a circular cross-section with only rectangular waves.

The current-carrying conductors of the windings must be insulated from each other for reasons of electrical dielectric strength. Similarly, the individual winding layers must also be insulated from each other or spaced apart, depending on the electrical voltage loads that occur. The force 1Q, = 1, of an electrical voltage load is often subjected to large m471 forces during operation and in the event of a short circuit, which can only be controlled by very expensive special measures. Axial support of coils is also known.

It has also already been proposed to mechanically strengthen the coil by coating or impregnating it with a resin adhesive.

As already mentioned at the beginning, the conductors that carry the current must be insulated from each other.Usually, the conductors are provided with a layer of insulating lacquer or covered with an extra insulating sheet, usually paper. The insulation between the layers usually consists of insulating sheets applied in multiple layers.

In order to achieve sufficient mechanical strength of the coil.

The above individual means are not necessarily sufficient and must be supplemented by combining these means. Mechanically reinforcing coils by painting or impregnating them with resin adhesives is very problematic when the coils are fluid cooled. This is because bubbles or chambers filled with gas or air are created, which have a very detrimental effect on the electrical properties of the insulation system.

The same problem occurs when using an insulating sheet that is fully coated with a B-condition resin adhesive.

The object of the invention is to avoid the disadvantages of the above-mentioned measures and to create a tight winding block that is force-restrained in each direction on the one hand, and on the other hand guarantees complete saturation with the insulating fluid. The goal is to create a unique insulation system.

The present invention provides that the conductor is covered with at least one dotted resin-coated insulating tape consisting of insulating paper, pressboard or the like and a hardened resin adhesive; The adhesive is characterized in that it adheres to the adjacent material in a semi-fluid state during subsequent heat treatment of the windings 1-1 and hardens after a relatively long exposure to heat.

With this insulating system according to the invention, it is possible to avoid dry pile formation for the first time when the coil is cooled with a fluid, and with good external saturation of the insulation with an insulating fluid, for example transformer oil or silicone oil. can be secured. According to the invention, the individual winding layers can be bonded and reinforced to one another in the radial direction via the layer insulation arranged between them and the surfaces of the adjacent winding conductors.

According to a further development of the invention, a number of insulating tapes stacked one above the other and cut out with resin in dots are provided as layer insulation. In the layer insulator 1- between the two winding layers, an insulating film is used which is similarly dot-covered with resin and wound in multiple layers. This insulating film adheres to the resin-coated insulation of the wound conductor, creating a force-constraining rigid bond between the winding layers in the axial direction of the coil.

According to another feature of the invention, slips of insulating material, preferably made in corrugated form, are provided to separate the winding layers for cooling passages. When providing cooling channels to improve the cooling between two winding layers, a tube made of insulating material is inserted between them to separate them.

This part made of synthetic resin, which helps maintain the spacing, adheres to the resin-coated conductor insulator of the adjacent winding layer during the thermal process mentioned many times, and also bonds one winding layer to the other. A force-restricted connection with the winding layer is achieved.

The insulation system according to the invention in its entirety creates a hard radially and axially force-restricting bond over all winding layers of the coil, which bond occurs during operation or in the event of a short circuit. Acts against mechanical distortion. The insulating system according to the invention allows complete saturation (impregnation) with the insulating fluid, ensuring that the resulting electrical dielectric strength is also reliably dominated.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

FIG. 1 shows a triangulated inner conductor 1 braided with an insulating tape 2 dotted with B-condition resin 8.

FIG. 2 shows a rectangular conductor 1 braided with an insulating tape 2 dotted with resin 3 under B-condition.

FIG. 8 shows closely adjoining wound inner conductors 1, which are braided with resin-coated insulating tape 2 in the form of dots, which adhere to each other in a subsequent thermal process. do. FIG. 4 shows closely adjoining wound conductors l of rectangular cross section, which are braided with an insulating tape 2 coated with resin in the form of dots, which in the following thermal process Glue to each other.

Figure 5 shows two winding layers consisting of an inner conductor 1-1.The inner groove body 1 is braided with an insulating tape 2 coated with resin and has a layer of insulation present between the inner conductors. The insulating layer consists of an insulating film 8 printed in dots with B-condition resin 4 and wound in multiple layers. In the following thermal process, the inner conductors 1 of the individual winding layers are bonded to each other and the insulating film 3 of the layer insulation.
, thereby creating a force-constraining bond between both winding layers. FIG. 6 shows two winding layers consisting of rectangular conductors 1 which are covered with an insulating tape 2 coated with resin and have a layer of insulation present between the conductors. , this layer insulator consists of an insulating film 3 printed in dots with B-condition resin 4 and wound in multiple layers. During the subsequent thermal process, the conductors 1 of the individual winding layers adhere to each other and to the insulating film 8 of the layer insulation, thereby creating a force-bound bond between the two winding layers.

[Brief explanation of the drawing]

Figures 1 and 2 show a conductor with insulating tape, Figures 8 and 4 each show two conductor layers, and Figures 5 and 6 show a conductor in an insulation system. be. 1... Conductor 2'... Insulating tape 8... Resin agent Hikaru Esaki Good agent Hikaru Esaki! =41-μ group-book. , 50 Showa s'? I1 Manabu Shiga, Commissioner of the Japan Patent Office on February 77th], Indication of the case Showa Tuff Year Patent Application No. 132/3 2 Name of the invention Applicant 4 Agent A) E5 2-8-1 Low 1', Toranomon 2-chome, Minato-ku, Tokyo
'Junki') [Say, i+%03 (502) 1476 (Representative)] Name: Caregiver (4013) Mitsuyoshi Esaki and 1 other person 5 Date of amendment order 6 Subject of amendment

Claims (3)

[Claims] (1) In insulating systems where the conductor has a rectangular or circular cross-section, especially in fluid-cooled transformers, choke coils, layer windings, etc., this conductor may be covered with insulating paper, pressboard or the like. Covering with at least one dotted resin-coated insulating tape consisting of an uncured resin adhesive, so that the resin adhesive becomes semi-fluid with the material with which it comes into instant contact during subsequent heat treatment of the windings. An insulation system characterized by adhesive bonding and curing after a relatively long action of heat. (2) An insulation system as claimed in claim 1, characterized in that a number of insulation tapes stacked one on top of the other and dotted with resin are provided as layer insulation. 3. An insulation system as claimed in claim 1 or claim 2, further comprising strips of insulating material, preferably corrugated, for separating the winding layers for cooling passages.