DE1438365B2 - HIGH VOLTAGE-RESISTANT INSULATION FOR THE GROOVE PARTS OF ELECTRIC MACHINERY COILS - Google Patents

Description

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The invention relates to a high voltage change within the solidified insulation Insulation for the groove parts of coils leaves. Due to the void-free intermediate filling electrical machines, the individual conductors of which with resin continue to provide a seamless connection between the impregnated, inorganic insulating material iso-insulated individual conductors of the conductor group and the are lated and in which the extrusion made from the isolated indentations 5 surrounding it, the line-to-line conductor assemblies made of extrusion from an inorganic insulating material The gusset is made of curable synthetic resin, one that is made up of a shrinkable carrier shrinkable plastic casing and an inorganic resin impregnated with plastic and impregnated with curable synthetic resin. In this way the high-quality insulating material Surrounded as an overpress and to in io term insulating properties having overpress fixed Spuiennutteile are baked. close fitting to the gusset-filled ladder assembly

In the case of the high-voltage-resistant insulation of the bond, which is pressed on from US Pat. No. 2,763,798 and also held in this intimately misunderstood bond during operation, so that the pressing in operation is of the type mentioned above with resin impregnation, cannot open, which also means here no single conductors isolated from harmful organic insulating material can be formed in 15 borrowed cavities,
The high-voltage-resistant insulation according to the invention resin is firmly embedded, whereby the conductor connection differs significantly from a plastic cover surrounding the conductor under tension from the German Auslegeschrift 1 015 526 known from shrinkable material, the single conductors up to become coil insulation, which is only for lower holds together for the curing of the synthetic resin and 20 voltages is suitable, since there is no inorganic firmly bonded to the cured synthetic resin. Insulating materials and no gusset filling between After baking the conductor group in one of the isolated individual conductors contains. In this press mold, the groove parts are provided with a customary insulation that has become known. By only allowing the body to be joined together before it is surrounded by a non-shrinkable, non-shrinkable, inorganic insulating material that can be applied without pretensioning. This plastic coating of high tensile strength is possible when the encapsulation opens during operation, and must not become detached from the conductors and so that harmful cavities 30 develop in the encapsulation. In order to be able to press together as strongly as possible. In addition, the individual conductors, which do not have a gusset filling, expand when heated differently than the individual conductors to be passed through the wrapped plastic casing and baked with them glued to the conductors and, accordingly, the end in this part of the insulation likewise creates unwanted cavities between the envelope and the part underneath. glued. The bonding has in connection with the

The invention is based on the object of providing an un-

high-voltage-resistant insulation of the cavities mentioned at the beginning have the major disadvantage that

th type to create in the operation with security with different expansion between conductors

any cavitation is avoided. 40 and isolate the conductors from the glued joints

The problem is solved according to the invention and additional cavities are formed in the process,

dung by the fact that between each bare, individual These cavities can also not through the order

conductor and its inorganic insulation with an applied with the plastic sheathing, too

This caked, adhesive-shrinkable, porous and impregnated with lacquer in a manner known per se

45 Pressing can be prevented without any medium on the individual conductor. The outer porous,

Low plastic film is shrunk and that shrinkable extrusion from organic materials

the shrinkable plastic cover together is also not sufficient for higher voltages.

with the inorganic insulating material worn by it, d. H. the well-known isolation is not for

material that forms the extrusion. Suitable for high voltage. In contrast, it succeeds

As an inorganic insulating material, it is in particular 50 with the insulation according to the invention by the

Mica paper film is particularly advantageous. '' Use of high quality inorganic insulating materials

With the invention, the from the German rialien in conjunction with the other measures after

Auslegeschrift 1 004 252 as well as from the ETZ-B, the invention a high-voltage-resistant insulation

Volume 11, Issue 10, in particular page 421, which cannot open up in operation and which

The conductor insulation that has become crimped-free and therefore remains completely void-free. ;

Shrink plastic sheet for electrical machi- The following is one shown in the drawing

low voltage cannot be compared. Embodiment of the object according to the

Rather, the invention is based on the knowledge, invention explained in more detail. It shows a partially

that this insulation of the individual conductors by the cut multi-layer high-voltage coil for

shrunk plastic film, the outside with a 60 electrical machines. .

synthetic resin-soaked wrapping for improvement mechanical and dielectric properties at least 130 ° C heat-resistant plastic film 2 is covered, the possibility of a perfect expansion from, for example, polyterephthalic acid ester Aufgenungsausgleichs between a single conductor and the 'it is shrinking. Around the plastic film are individual lines and seamlessly surrounding insulation results in 65 terisolierungen 3 glass, asbestos or other in which no cavities can form, since the mineral fibers are existing threads, alone or adhesive-free shrink-on plastic film in connection with mica and / or asbestos paper bare conductor to the outside and a Lan- spun, which is coated with a hardenable protective varnish, both

for example with epoxy and / or phenol-alkyd resin paint impregnated and fixed. The protective varnish mentioned is initially only partially cured.

After the coil has been shaped, the hardened protective varnish is first applied through heat treatment brought into a semi-thermoplastic state, and then the lacquer layers of the insulation the single conductor 1 firmly baked together by pressure. One on the single conductor insulation 3 applied excess paint fills as a gusset filling 4 when baking between the individual conductors 1 existing gaps from void-free.

In the case of multi-layer coils, it can be advantageous to fill the gusset between the individual conductor layers To bring in mica or glass paper foils with excess resin or lacquer content. Possibly it can be advantageous to use a mica or glass paper film around the conductor assembly to be arranged and impregnated with excess resin or varnish, so that a ladder association with particularly smooth outer surface is obtained. The ladder association is surrounded by a press-fitting5 that a high-quality inorganic insulating material such as mica, asbestos, glass fabric and, if necessary Contains combinations of these substances. The inorganic insulation materials are on a shrinkable Carrier in the form of a film or a fabric made of, for example, polyterephthalic acid ester or polycarbonate applied. The extrusion is bound with a hardenable resin and under pressure and heat in itself void-free and void-free around the baked void-free Conductor association arranged, with an opening of the extrusion through the use of the shrinkable Carrier is safely avoided.

Mica paper film is preferably suitable for the high-voltage-resistant insulation according to the invention both in connection with the shrinkable carrier for the extrusion and without a carrier as part of the gusset filling.

Claims (3)

Patent claims: 1. High-voltage-resistant insulation for the slot parts of coils of electrical machines, their Individual conductors are insulated with resin-impregnated, inorganic insulating material and in which the conductor assemblies from the gusset composed of the insulated individual conductors filling, curable synthetic resin, a shrinkable plastic cover and a Inorganic insulating material impregnated with curable synthetic resin as an encapsulation and are baked into fixed Spulennutteile, characterized in that between each bare individual conductor (1) and its inorganic insulation (3) has a bonded to it, in a manner known per se without adhesive on the individual conductor (1) lying void-free Plastic film (2) is shrunk on and that the shrinkable plastic casing together forms the encapsulation (5) with the inorganic insulating material carried by it. 2. Insulation according to claim 1, characterized in that isolated between the individual Conductor layers and / or around the conductor association soaked in excess of curable synthetic resin Mica paper foils are provided. 3. Insulation according to claim 1, characterized in that for the pressing with hardenable Mica paper film impregnated with synthetic resin and carried by the shrinkable plastic cover is provided. 1 sheet of drawings