DD141586A1 - HEADSOLUTION OF COILS FOR HIGH-VOLTAGE DRY TRANSFORMERS AND THROTTLE LOW-HEAD LIGHTS - Google Patents

Abstract

The vertical height of the coils is reduced while at the same time Ensuring high heat resistance. The inner and outer radial insulators of the coil protrude beyond the lower and upper winding wire plane. Also the Layer insulation projects beyond the winding wire plane. The resulting free space at the end faces of the coil comes with a good adherent mechanically strong and heat-resistant insulating compound filled .; The insulating compound closes the layer insulation one and the protruding coil insulation flush. The invention is especially for use in Rail vehicle construction provided.

Description

Title of the Invention ".

Stirnisolation of coils for low-voltage high-voltage dry-type transformers and chokes

Field of application of the invention

The invention relates to a voltage-resistant insulation of coil end faces for high-voltage dry transformers and -drosseln the. Insulation class H, in particular for installation in equipment boxes under rail vehicles.

Characteristic of the known technical solutions

It is customary not to isolate the coil faces of dry transformors and chokes of greater power. The insulation of the conductive winding parts against the mass parts (magnetic and structural parts) is ensured by appropriately dimensioned clearances and creepage distances. The mechanical forces for the vertical compression of the coils are transmitted by electrically non-conductive spacers, which are dimensioned according to the creepage distances required by tension. According to the voltage applied to the winding, the creepage distances and clearances can be considerable and, at higher voltages, also lead to larger vertical distances between the yokes and the structural _{parts β}

It is furthermore known to completely cast coils or also complete transformers and small power chokes or measuring transducers into plastic resins. However, owing to their low heat resistance, casting resins are not suitable for insulation of insulation class H.

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Object of the invention

The object of the invention is to reduce the vertical height of high voltage transformers and reactors while ensuring high heat resistance.

Explanation of the essence of the invention

The reduction of the vertical height while ensuring a high heat resistance is achieved by the special design and isolation-technical design of the coil end faces * Here, the inner and outer radial insulators of the coil are arranged on the lower and the upper winding wire level protruding. The layer insulation also protrudes beyond the winding layer · The coils thus produced are soaked and / or color-treated in a known manner. The over the winding wire planes resulting free space is filled erfindunpgemäß with a well-adherent mechanically strong and heat-resistant insulating. The insulating material closes off the projecting coil insulation flush. Intended diversion channels are filled with insulating material if necessary for electrical reasons. For cooling reasons, these stray channels can also remain free. To improve the support webs are mounted according to the invention in the poured free space, which are completely enclosed by the insulating and not protrude from this,

embodiment

According to the drawing . protrude the inner and outer radial insulation 1; 2 a manufactured in a known manner coil 3 via the lower and upper winding wire plane 4; 5 axially out. The introduced in a known manner layer insulation 6 also easily surmounted the lower and upper winding wire level 4; 5 *

This production method applies equally to all end faces of the top and bottom concentric cylinder windings. The coils 3 produced in this way are soaked in a known manner and / or color-treated. , , ·

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The between the protruding inner and outer insulation 1; 2 remaining space 7 is with a good adhesive high-quality Isoliermasse .- predominantly silicone rubber - flush with the protruding inner and outer insulation 1: 2

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Bubble-free air ducts between the individual windings which have been provided for cooling purposes are not shed. The thickness of the insulation layer depends on the breakdown strength of the casting compound used and the coil voltage.

In the insulating layer supporting webs can be introduced at suitable locations, which, for example, comb-like over the layer insulation and engage with the insulating well-bonded and do not protrude from the grout. These support webs are not shown in the drawing.

After curing of the potting compound, the coils are installed and clamped by means of the corresponding construction elements directly without v / eitere insulating liners with the transformer / choke core *

The invention described above has the following advantages:

- Voltage and breakdown resistant insulation and mechanically strong termination of the coil end faces

- Elimination of isolated distance and construction elements

- Elimination of the previously required air routes for isolation purposes

- Reduction of the axial winding window dimensions of the core 'and thus the overall height of the transformer / the throttle.

- Compliance with insulation class H by using heat-resistant silicone rubber

- By casting the coil end faces a hermetic termination of the coils is achieved, which prevents ingress of moisture and the formation of creepage paths. It is achieved a longer life of the coils.

Claims (3)

21.06 51 - * - Inventions addressed - 1 · Stirnisolation of coils for high-voltage dry transformers and chokes low height especially for installation in equipment boxes in rail vehicles, which are arranged structurally under the car floor, in which arranged between bobbin and magnetic yoke or construction elements spacer elements, characterized in that the inner radial insulation (1) and the outer radial insulation (2) of a known coil (3) via the lower winding wire plane (4) and the upper winding wire plane (5) and introduced in a known manner layer insulation (6) axially over the end face of Winding protrude and between the protruding inner and outer coil insulation • (1; 2) remaining space (7) filled with a well-adherent mechanically strong and heat-resistant insulating compound, mainly silicone rubber, flush to the protruding inner and outer insulation (1, 2) bubble-free is. 2 · Stirnisolation according to item 1, characterized in that the intended for electrical reasons scattered channels between the individual windings are optionally filled with the insulating material or are not filled for cooling reasons * 3. Stirnisolatioh according to item 1 and 2, characterized in that in the poured free space (7) at certain points with the L3 lickermasse well adhering connected from the potting non-protruding support webs are arranged « For this purpose / f page drawing