DE2205073A1 - PRESSING DEVICE FOR THE WINDINGS OF TRANSFORMERS, REACTOR COILS AND THE LIKE - Google Patents

Description

Transformatoren Union Aktiengesellschaft 7ooo Stuttgart-50, Deckerstraße 5

Erf.-No .: FST 71/51 Ln Stuttgart, 1.2.72 PT-FST / Lehmann / ei

Pressing device for the windings of transformers, Choke coils and the like.

The invention relates to a pressing device for the windings of transformers, inductors and the like., at which elastic intermediate links are switched into the press path

In the case of coaxial windings of transformers flooded in opposite directions (upper and lower voltage windings), forces occur as a result of the current forces due to axial asymmetries of the current density distributions in both windings that are never to be avoided, which tend to axially shift the two windings against each other. When short-circuits occur and the windings are _o see dependence on the current strength by orders of magnitude <*> larger, so that the windings against these effects

^. must be protected by constructive measures.

Since the short-circuit current forces are extremely high short-term Reach peaks, the aim of the designer is to make the windings possible in the axial direction.

Erf.-No ,; FST 71/51 Ln -JB. -

borrowed hard to clamp and the possible elastic and anticipate non-elastic negative changes in length of the winding by applying an appropriate preload.

Since there is now a time-dependent negative change in length of the Winding cannot be avoided, on the other hand production «- conditional length tolerances are compensated and taken into account must be "it is already known" in the pressing device of transformer windings in elastic elements Shape of steel springs, in particular disc springs, to be arranged.

The arrangement of all the spring elements now requires especially with two or more coaxial windings, • a relatively complex and sensitive press construction.

A major simplification of the press construction as well a reduction of disturbances is achieved according to the invention Compensation elements made of pressure-elastic * rubber-like material Material in the press path, which are reinforced with a tensile material, is achieved.

In view of the high specific pressures and the specific properties of the rubbery material that tends to flow with longer and heavier loads, it is proposed according to the invention that the elastic compensation element to be reinforced with a tensile material.

In a preferred embodiment, this reinforcement arranged in a closed circuit along the surface of the element. In particularly stressed areas, So the support points of the compensation elements, it is also useful to have an additional reinforcement, for example Doubling of the number of layers of the reinforcement, to be provided *

309833/0682 - 3 -

Erf.-No .: FST 71/51 Ln -> -

Ala suitable material for these equalizing elements Elastic plastic is recommended and a glass fiber fabric as reinforcement.

The application of the invention in dry-type transformers, especially in cast resin transparent format, has particular advantages Or s in which the windings are cast in synthetic resin and practically as rigid, compact Cylinders can be viewed

Based on the accompanying drawing, the inventive The design of the compensation elements briefly explained

In Fig. 1 there is a compensating element according to the invention 2 on the end faces of the coaxial windings 1 and is somehow conventionally machined Device pressed on. In this body made of pressure-elastic material there is a reinforcement 3 "which is laid in circulation along the surface of the body and is so tensile that it avoids tearing of the body even under the highest stress

FIG. 2 shows a sectional view along the line indicated in FIG. 1, in which the lateral bulge of the material is shown under the influence of pressure.

In Fig. 3 is above the particularly stressed pressure points over the end faces of the windings 1 a additional layer 4 of the tensile material inserted, so that reinforcement against tearing is effected.

309Ö33 / 0582

Claims (4)

Transformatoren Union Aktiengesellschaft 7ooo Stuttgart-5o, Decker traßβ 5 Erf.-No .: FST 71/51 Ln Stuttgart, 1.2.72 PT-FST / Lehmann / .i Patent applications [1 ·) pressing means for the windings of transformer ^ - ^ factors, choke coils and the like, characterized in that a tension-resistant material are reinforced in the pressing path Auegleicheelemente aua druckelaatiachem kautachukartigem material ait, are inserted.. 2. Pressing device according to claim 1, characterized in that the reinforcement (3) is arranged in a closed circuit along the surface of the element (2) (Fig. I ₁ 2). 3 · pressing device according to claim 1 or 2, characterized in that a additional reinforcement (4) inserted is (Fig. 3) · 309833/0582 2 2 "O 5 O 7 3 Erf.-No .; FST 71/51 Ln - Jt - 4. Pressing device according to one of claims 1-3, characterized characterized that the pressure-elastic rubber-■ chuk-like Material is an elastic plastic. 5 * pressing device according to one of claims 1-4, characterized characterized in that the reinforcement consists of fiberglass fabric 6 · press apparatus according to any one of claims 1-6 _t characterized in that it is attached to dry-type transformers, particularly cast resin # 309333/0582 Blank page