DE1563243B2 - INDEPENDENTLY ADJUSTING PRESSING ARRANGEMENT FOR WINDINGS OF TRANSFORMERS AND REACTORS - Google Patents

Description

located fulcrum via a rigid connecting element with the weight of the active parts is applied.

For reasons of stable equilibrium, at least two or more such lever arrangements are required provide. There is an expedient structural design of such a lever arrangement in that the fulcrum by means of a tension element (a tie rod or plate) rigidly with is connected to the support of the underside of the winding, with the longer lever arm attached to the boiler structure is attached and the shorter via corresponding pressure rings or pressure bars on the top of the Winding presses. By choosing the length of the lever arms you have the desired degree of reinforcement in your hand, so that you can get any possible can compensate for dynamic force amplitude.

In the case of smaller transformers, a significant simplification of the structure and construction can be achieved when the levers are supported with their longer arms on the boiler lid. The support points at the ends of the levers they are used as pressure rollers to avoid frictional losses form.

The drawing shows an embodiment of the invention, in which the entire active parts are hung on the boiler lid and are only guided in the vertical direction on the boiler bottom.

F i g. 1 shows an overall section through a boiler,

F i g. 2 the design of the leverage in detail,

F i g. 3 the lateral guide of the upper press beam attached to the core. ■;

In Fig. 1 are located in the boiler 1 consisting of a core with side press iron 2 and 3 windings active parts. Consoles 5 are welded to the boiler cover 4 according to the example shown, where the lever 6 with its longer

ίο Lever arm in the bearing 7 rotatable and longitudinally displaceable are attached. The fulcrum is rigid with the lower press iron by means of the tie rods 8 2 connected. The short lever arm 9 presses via the pressure rollers 10 on the upper press iron 2, which of course must be vertically displaceable with respect to the core. The F i g. 2 and 3 show this Lever reinforcement of the pressing force in detail. By the

selected large lever arm length ratio y- be

ao the winding compression forces according to the dead weight multiplied.

In Fig. 3 is the end view of the lever arrangement and one attached to the core yoke side 11 Slideway of the press bar 2 by means of rollers 12, since the press bar 2 at the same time the lateral Have to take over yoke pressure.

The side bracket can, as shown in FIG. 1 shown by bolts 13 welded to the boiler bottom, which slide into corresponding bores in the lower press beam 2.

1 sheet of drawings

Claims (4)

1 2 performs. It is known that these thermal claims: Forces by elastic bracing, for example by means of spring elements, can be absorbed. Man 1. Self-adjusting press arrangement for only needs to ensure that a sufficiently large Windings of transformers and chokes - 5 elastic part of the entire system the possible coils, at which the pressing pressure due to the fact that there is too much plastic deformation of the solid Dead weight of the insulating materials prevented by several lever arrangements. The forces to be controlled carried active parts is applied, but there are so large that a spring system in the hitherto characterized by that to the common < Transformer construction built in, leads to an increase in the winding pressure a or io very large expense and for reasons of several unequal arm lever arrangements such electrical dielectric strength arranged with considerable difficulty are that each prepares the final disposal of the keiten. longer lever arm on the boiler construction It is known to reduce the compression pressure from its own weight takes place and that in each case the final storage of the short of the active parts to be applied by, for example, The lower end face of the winding is supported by the lever arm on the end faces 15 to be pressed of the windings is supported and that in each case the after and the total weight of the active parts (des According to the ratio of the lever arm lengths core and the core press assembly) to the upper the end face of the winding located between the two end bearings is placed; where the Lever fulcrum via a rigid connecting pressure effect due to the weight of the winding element is reinforced with the weight of the active parts 20 itself (German Patent 374157). is applied. Now the dead weight of the active parts is generally sufficient 2. Press arrangement according to claim 1, characterized in common not to be effective in the event of a short circuit characterized in that the fulcrum points to compensate by means of electrodynamic forces rigid with the support of the winding, and it is also already known, the underside of the suspension are connected that the end elements are to be attached, which provide the necessary press mounting the longer lever arms on the boiler apply pressure and thermal expansion without lead construction takes place and take up the final storage of the existing deformation (German patent specification short lever arms via pressure rings on the 941 929). , supports the upper end of the winding. It is also already known, the axial compression of the 3. Press arrangement according to claim 1 or 2, da- 3 ° windings by the dead weight of the active parts, characterized in that the final storage of the particular core with the press construction, longer lever arms on the boiler lid. to undertake, whereby by the arrangement of 4. Press arrangement according to one of claims 1 level-like equal-armed lever structures to 3, characterized in that the support on the end faces of the two coaxial windings points at the lever ends as pressure rollers, it is ensured that the pressure is even are formed. distributed on both windings and one uneven Settlement or permanent deformation of the windings can occur without the pressure on the individual winding changed. By means of this horizontal 40 similar lever construction is only one uneven change in length of two coaxial The current-carrying windings are compensated for by trans windings (U.S. Pat. No. 1,600,963). In the event of a short circuit, formators and choke coils, as already stated, require constructions due to the high quadratically with the current strength using spring elements a significant increase dynamic effects of the effort borrowed compared to 45, not least one in the Trarisf ormatordem Rated current multiplied short-circuit current boiler precious space, on the other hand, nowadays is almost strength exposed to considerable mechanical forces. always the one that can be applied by its own weight To counteract these forces, the windings resist axial pressure on the end faces of the windings to make them capable, they are already installed in view of the expected force effects of the corresponding pre-pressing exposed. 5 ° short-circuit currents not sufficient. Depending on the type of used in the windings, the object of the present invention is to Winding wires and the type of winding arise a more with the smallest construction, material and space or less elastic bobbin, which is also more difficult to achieve due to its own weight because of the proportion of solid insulating materials - z. B. Paper pressure to increase many times. this will or pressboard - to a certain extent up to 55 in an automatically adjusting press arrangement plastic, irreversible deformation tends when appropriate for windings of transformers and chokes Coil forces introduced into the system, in which the pressing pressure due to the inherent weight of the weight of several lever arrangements In particular, when the rigidly inserted active parts are heated, those that are subject to the invention are applied Winding the expansion forces of the conductor 60 achieved in that to increase the materials to a large extent effective. There occurs a winding pressure one or more unequal combinations of plastic (irreversible) and armed lever arrangements are arranged in such a way, elastic (reversible) deformation due to the expansion that in each case the end position of the longer lever arm tion forces, which in the worst case - z. B. takes place at the boiler construction and that each frequent load changes - to a loosening of the final storage, the short lever arm moving towards the Pre-pressing and thus for releasing or pressing end faces of the windings and supports shrinkage of that pre-compression, which that in each case according to the ratio of the mechanical strength in the event of a short circuit is guaranteed by lever arm lengths between the two end bearings