Insulating tape and method of its manufacture

 

(57) Abstract:

The invention relates to insulating materials and methods for their manufacture. According to the invention of insulating tape consists of one or more layers of glass and one or more layers of mica. Glass filament fabrics have a protective coating of resin or varnish. Cell fiberglass filled resin with a filler containing microscopically small particles with conductivity greater than that of the resin. Duct tape has higher conductivity, mechanical strength and heat resistance. 2 S. and 3 C.p. f-crystals, 2 Il.

Scope.

The invention relates to an insulating tape containing at least one layer of mica and one layer of fabric, with a significant degree of cell tissue, consisting of threads filled with resin with a filler containing microscopically small particles with larger than particles of the resin, thermal conductivity.

The invention relates further to a method of manufacturing such an insulating tape.

Large electrical machines with a cooled indirectly by a stationary winding is very demanding to thermal insulation of the winding. As the warmth, who is a metallic environment, insulation should not have some random thickness, on the other hand, must be kept at the machines high voltage with a rated voltage of 16 kV certain minimum thickness of the main insulation. Hence the great need for insulating materials, durable against high breakdown voltage and at the same time with good conductivity.

Basic insulation stationary winding according to US-A-4 806 806 or similar content EP-A-0 266 602 consists of layered insulating tape wound in multiple layers around a bundle of wires. Insulating tape provided with either of the above-mentioned impregnation resin, or a resin was applied only after winding an insulating tape. Herself insulating tape consists of several thin mica layers and hard layers of fiberglass. To improve thermal conductivity in the impregnating resin was added inorganic filler with good thermal conductivity, for example of nitrogen, aluminum, and nitrogen silicon, aluminum oxide magnesium oxide, beryllium oxide or silicon carbide with a particle size of 0.1 to 15 μm, and the coefficient of execution is at least 90 weight percent in the cells of fiberglass.

In US-A-4 806 806 uke is the outer coat of the mixture, on the other hand, decreases the risk of damage to sensitive mica coating. However, these inventors have lost sight of the fact that the particles of filler mechanically destroy largely filament fiberglass. These threads of the fabric are composed of thin and very thin fibers, which are twisted with each other, and the diameter of the fibers corresponds to the size of the filler particles. These particles with sharp edges can damage the threads of the fabric during the winding, especially in the further processes of pressing, so that the glass can no longer perform or may perform insufficient function of the media and who consolidates.

The basis of the invention is the task of making an insulating tape having a relatively high conductivity without compromising its electrical insulating properties and its durability, and also describes a method of manufacturing such a tape.

This problem is solved in accordance with the invention, so that the threads of the fabric have a protective layer of resin or varnish, which covers mostly only thread and not fill in this cell, tissue, and percentage of mica in relation to the filler in a weight percentage greater than or at least the coy, thermal and mechanical durability. As an impregnating resin mixed with filler, is mostly only between the tissue cells and not in the mica layer, electric (breakdown) insulation strength even increases. The liquid particles having sharp edges, cannot incise fine filaments or fibers that make up the filament, so that the mechanical strength at the time of manufacture of the tape and its application to multi-wire conductor, and during further operation is also stored. Good thermal coupling of the adjacent mica layers - they are good teploprovodnymi - is ensured by the application of an impregnating resin, which is also a good conductor of heat.

Manufacture of insulating tape is such that the threads of the fabric is first coated with a layer of flowable resin, preferably epoxy resin, so that in the main thread cause the protective layer, however, the resin does not fill the cell tissue. After that, the filler in the form of a binding resin applied to the tissue by the method of calendering.

Examples of carrying out the invention, and also achieved when the benefits are explained further in detail using the drawing.

Nastojashi isolated from each other separate wires; in Fig. 2 is a greatly enlarged section 1 explaining the structure of the main insulation.

According Fig. 1 stranded conductor electrical machine consists of many isolated from each other separate wires 1, made in accordance with insulation 2 for individual wires. Separate the wires 1, collected in one bundle of wires, surrounded by basic insulation 3.

In highly magnified cutout according to Fig. 2 shows the multilayer structure of the main insulation, consisting of many intertwined insulation tapes 41, 42, 43, 44.

Each insulating tape 41, 42, 43, 44 ... has two layers: the mica layer 5 and the layer of glass 6. Cell fiberglass, with the warp threads 7a and weft threads 7b, i.e., the space between the two adjacent glass filaments of glass 6, the filled resin 8, to which was added a powder of oxide of metal 9 with a particle size of from 0.1 to 15 μm. Mica layers 5, in contrast, contain practically no powder of oxide of the metal.

In this respect, the structure of the insulating tape complies with the above in patent US-A-4 806 806.

According to the invention, the warp threads 7a and weft threads 7b fiberglass is provided with a protective layer 10, the thickness that the layer 10 prevents the cut glass fibers, consisting of thin optical fibers 11. The protective layer 10 is preferably made of elastic epoxy resin, which is compatible with the subsequent impregnating resin and also moisturizes glass filament 7a and 7b and the optical fiber 11.

The preferred embodiment of the claimed insulating tape has the following typical parameters:

The thickness of the layer of fiberglass 6 - 50 µm

The thickness of the mica layer 5 - 100 µm

The thickness of the warp and weft threads 25 μm

The thickness of the fibers or filaments of 8 μm

The thickness of the protective layer 10 is 5 μm

The particle size of the powder of aluminum oxide - 3 μm

Pungent resin 8 - Epoxy resin

Instead of fiberglass can be applied to so-called mixed fabric with warp threads 7a of the glass threads and weft threads 7b of synthetic material, for example a complex of the polyester.

In the manufacture of insulating tape, first thread 7 fiberglass 6 covered with a flowable resin, preferably epoxy resin, so mostly covered with a protective layer only yarn, resin, however, does not fill the cell tissue. After that, the filler (resin and a powder of metal oxide) is applied to the fiberglass method of calendering. Finally, Armenia least one layer of mica and one layer of fabric, the cells between the threads which are filled with a resin with a filler containing microscopically small particles with a higher thermal conductivity than the resin particles, characterized in that the threads of the fabric have a protective layer of resin or varnish, and the cells of the tissue are left blank, and the fact that the proportion of mica in comparison with the filler in a weight percentage greater than or at least equal to 1.

2. Tape p. 1, characterized in that the filler consists of at least one component selected from the group consisting of nitrogen boron, nitrogen, aluminum, nitrogen and silicon, aluminum oxide, magnesium oxide, beryllium oxide or silicon carbide, and the particle size of the filler is from 0.1 to 15 microns.

3. Tape under item 1 or 2, characterized in that the protective layer is made of a resin or varnish and has a thickness of from 1 to 10 microns.

4. The tape according to any one of paragraphs. 1-3, characterized in that the fabric is fiberglass or mixed fabric with a basis of glass fibers and the weft thread from a synthetic material, for example a complex of the polyester.

5. A method of manufacturing an insulating tape under item 1, characterized in that the threads of the fabric is first coated with a layer of flowable resin, preferably epoxy on the fabric causing the resin with the filler and eventually the thus treated fabric glue with mica layer.

 

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