DE1513906A1 - Winding for dry and oil transformers and chokes made of conductive foil - Google Patents

Description

Winding for dry-type and oil transformers and chokes made of conductive foil The use of poles as winding material for electrical coils offers cheaper material costs, simpler and quicker winding work, so that considerable cost savings are achieved compared to the known coils made of insulated, round or rectangular wires been. With high-voltage coils, a high number of turns with a relatively small cross-section is required, and the potential difference between the wang and fade of the coil must be bridged by insulation and spacing to assemble existing individual coils with appropriate winding insulation.

In the case of completely encapsulated electrical coils, in particular counter voltage coils, a production method is already known, a coil body made of deformable but softenable or solidifying insulating material with a conically protruding plan. 80hen to be used, whereby during winding the conical parts of the winding space are covered by inserting templates against the remaining winding space and after this space has been fully wound and after removal of the templates around the coil circumference, a shrink film protruding with its edges over the winding face is placed and then attached is shrunk and finally the initially conical puddles with overlapping with the shrunk film edges of the outer polishing bandage are pressed down on the winding face and remain in this position by solidifying or hardening.

With this known method, it is on all sides to the outside encapsulated coil in round wire winding, which is used for low-voltage devices, like the mentioned counters for consumer voltage, are suitable, but not for fär higher voltages and with windings made of metal filaments as conductors.

The winding insulation in such individual coils wound from metal foils for devices for higher voltages, in which the wrapping foil occupies the entire coil width, can now be made from insulating material directly connected to the foil, e.g. B.

or lacquer layer of a Oxyd- or consist kaachierten paper, or it may have been mitgewickelt an intermediate layer of insulating material. The problem of end face insulation always arises, because at this point, due to the sharp edges of the film, field strength concentrations occur and a larger potential difference is bridged over a relatively short distance.

A good end face insulation in coils in the form of Polienbandwickeln is achieved according to the invention, if the winding insulation consists of electrical or shrinking insulating tape that protrudes on both sides over the conductive film and the protruding edges are folded inward in the radial direction due to corresponding winding tension or shrinkage with subsequent heat treatment.

Today there are a number of elastic Kunstatoffolien with high insulation strength, which are suitable for the purpose mentioned. Leg winding a wrapping film which is made of insulating tape loading stand by the strong winding tension elastically stretched and places tighten the winding of conductive foil on "The overhanging edges through the Elastizi - ty the material back together and bl-" 4 '"zi computationally flanachartige inwardly bent collar which apply depending on de. # of the train and the elastic elongation more or less closely the end faces of the reel.

With certain types of insulation, especially with thin foils with can not be acted upon, the subsequent folding can also can be achieved by appropriate heat treatment in the furnace.

It is often expedient to still provide the end faces with a pre-gun made of casting resin or a similar suitable material, whereby the bent edges of the elastic insulation must not be too tight to allow the potting agent to penetrate.

If Verguas is not provided and the coils should remain dry, the coils can be wound with such a strong winding tension of the winding insulation that the rolled edges are fully corrugated and tight on the end faces. On the attached drawing is in Pig. 1 shows as an example a coil wound with a weak Vickel tension or a small E #, shrinkage of the winding insulation, the edges only bending slightly inwards and allowing unimpeded access to a potting or impregnating agent.

In Fig. 2 a Vicklung is shown, which is produced with strong winding tension or large shrinkage of the winding insulation, in which the protruding edges bend close to the end faces. In d = both pigures, the pile winding with conductive or 7blie 2 and Viadufflinolation 3 is wound onto a bobbin (cylinder section) 1.

With the Masonabze according to the invention there is a reliable insulation the critical and endangered end faces of coils made of wound film are guaranteed with the smallest amount of material and labor. By applying heat and pressure The protruding, folded back edges of the poles can be completely on the forehead be welded together tightly.

Claims (2)

P ate n tan ap r ü o he winding for dry and oil transformers and chokes made of conductive film. 9 in which a number of polishing tape windings - partial apules wound from foil tapes - are lined up next to each other and connected together, with the layer insulation of the polishing layers consisting of insulating tape protruding on both sides consists "characterized in that the layer insulation consists of elastic material or material that sumps during heat treatment" and that the protruding edges are folded inwards in the radial direction as a result of corresponding winding tension or shrinkage during subsequent heat treatment and the edges overlap several layers radially. 2. Winding according to claim 1, characterized gekennzeiähnetg that the protruding edges of the elastic Windmgsisolation apply completely to the end face of the winding. 30 Vioklm « » c & A »p = b 19 d & 4u = h eukomme2-ob» te dIaso the front pages of the fortim »utewtokel with Gionom" 4. vioklung after Ännprmh , around 21 dmomb because » the adjacent amder der elffli» hm VUAM «o- toolattou du = h Ammdung von Drwx and Vft » nit * Jnander "rwhweier3t ein .