DE3322173A1 - Cylindrical oil tank for stepping switches of stepping transformers - Google Patents

Abstract

A cylindrical oil tank for stepping switches of stepping transformers, whose housing wall consists of a hollow wound body consisting of threads which are wound in the form of crossing layers. The housing wall carries a plurality of contacts at different electrical potentials, both in a plane of the cylinder and in at least one further plane, which contacts are inserted into holes or recesses in the housing wall. The winding angle of the resin-impregnated threads is dimensioned such that each thread which runs into a hole of a contact runs past each hole of an adjacent contact at a different potential.

Description

Maschinenfabrik Reinhausen 282Ma / Gl

Gebrüder Scheubeck GmbH & Co KG
Falkensteinstrasse 8

8400 Regensburg

Cylindrical oil container for tap changers of tap transformers

The invention relates to a cylindrical oil bottle according to the preamble of the claim.

Lv, it is known to design the cylinders of such oil vessels as hollow wound bodies with resin-impregnated threads, the threads being wound, for example, in cross layers in order to achieve high mechanical strength in both the axial and radial directions. Certain winding patterns and winding programs with different winding angles are used in coordination with the expected mechanical stress on the hollow winding body and not only for the oil containers mentioned. In the case of the oil tanks mentioned, however, it is not only the mechanical stress on the hollow wound body that is important, but special dielectric stresses are added to the mechanical stress. The voltage stress that occurs between the contacts plays a special role here.

The object of the invention is to improve the oil vessel mentioned above so that in addition to a high mechanical strength also a high dielectric strength specially different between contacts electrical potential is reached. According to the invention, this object is achieved by the characteristics of the claim specified means solved.

The invention is based on the fact that a resin-soaked threads of cross-wound insulating

cylinder not viewed as a homogeneous insulating material can be. In the case of such a material, the dielectric strength must be seen as a function of the direction of stress will. Two directions of stress should preferably be considered, namely the stress in the direction of the fibers and the stress across the grain. The stress is always in the direction of the grain Less favorable values result than stress across the grain. The cause is to be found in that individual threads are sometimes not completely wetted by the resin and thus directed penetration channels can come along the fibers between two points of different potential. Now, as suggested, the winding angle is so placed that a thread running into a hole in the cylinder wall is attached to each If the adjacent hole passes, a direct channel formation between metal parts can no longer occur different potentials come. The advantage achieved by the invention is therefore to be seen in the fact that overall the dielectric strength of the cylinder wall, how it occurs between contacts of different potential on such cylinders is improved.

An embodiment of the invention is shown in the drawing shown in detail. The figure shows part of the cylinder wall of an oil vessel in the development.

Here, two bores 2, 3 in a first cylinder plane El and two further bores 4, 5 in a second cylinder plane E2 are provided in the cylinder wall 1 for receiving the contacts, not shown in detail. The inclination of the wound threads with respect to a cylinder plane EO is regarded as the winding angle / ^. The conditions OvJ thus result for the winding angle / o. "CA? ¹ CCA or / 3 Λ (Λ ^ · Here the angles (a 1, OC 2,

in each case by applied to the adjacent bores 2 and 3 or 2 and 5 on different sides Tangents ti, t2, t3 formed:

ti is that of the two holes 2, 3 of the same plane El laid out on the different sides of the holes Tangent,

T2 is the tangent applied to the two bores 2, 5 of the planes E1 and E2, namely to the two facing sides of the holes,

t3 is the one at the two holes 2, 5 of the levels El and E2 applied tangent, namely at the two each other opposite sides of the holes.

Claims (1)

Claim Cylindrical oil tank for tap changers of step transformers, the housing wall of which consists of a hollow winding body made of resin-impregnated threads that are wound cross-layers at a winding angle, and the housing wall of which carries several contacts of different electrical potential, both in one plane of the cylinder and in at least one other plane, which are inserted into bores or recesses of the housing and screwed to the latter, characterized in that the winding angle ( la ) is dimensioned so that each thread running into a bore (e.g. 2) or recess of a contact of one potential at each bore (e.g. 3, 5) or the recess of an adjacent contact passes by another potential.