DE2736092A1 - Transformer winding for very high currents - consists of two turns in form of printed circuits bent, clamped and connected with each other - Google Patents

Abstract

The transformer winding has two turns radially inside each other and connected in series. They consist of circuit boards whose width is equal to the winding length. Circuit boards of both turns (1, 2) are at the winding start and end-brought out radially over a bend, and the four strips of the circuit boards are directly near the outer turn (2)-bent, electrically insulated from each other, and mechanically rigidly clamped. The lead-through and connections necessary for the electric connection of the two turns (1, 2) are on the side of clamping point opposite the turns.

Description

winding for transformers with two turns for very high

electrical currents The invention relates to windings for Trausf @@ matoren for very high electrical currents with two radially superimposed.

through a penetration arranged along an axillary allelic line a @ electrically connected in series @@ teu wi @@ @gon a @ s Leit @@ plates, the width of which is the same the winding length is In so-called furnace transformers i are the low voltage winding The currents are often so high that z @@ Ye @ avoid higher additional losses across the width of the conductor equal to the winding length is chosen, this is when using two windings for the transition from one to the next there is a mutual interpenetration necessary.

For this purpose, in a known arrangement, the connection of the inner with the outer turn so made @, d'ai one end of the inner turn windowfö cut-outs are given by which the serrated cut-out end of the outer coil hirt.. durchgeiädolt and with the second end of the inner wire is welded.

According to another known arrangement, the connection of the inner to outer turn produced by the fact that at one point on the circumference inner winding is provided with cut-out ends that are offset from one another in a serrated manner, the outwardly angled and with water consisting of two half-shells outer Winding are welded.

The disadvantage of the known arrangements is that at the connecting stalls between the inner and outer turns to absorb the forces generated by the @ adial @ forces on the The tensile force generated by the circumference is only less than half of the winding cross-section is available. The @ überhi @ aus is currently being used at the reading places by the existing Weld seam considerably reduces the load capacity of the remaining cross-section @ In addition, the weld seams are additionally stressed by the fact that the cranked Ends of the inner turn are inclined to the circumferential direction.

In the case of transformers, there is a high output with correspondingly high currents On the low-voltage side, there are desja; b doe high radial short-circuit forces the known connections can no longer be mastered. those at the point of penetration Required reinforcement of the building material could only be achieved by a thickening in the radial direction on d @ s four times the de @ n @ amal @ Lei terstär @ e can be achieved, which at this point, however, result in inadmissible @@@ e additional losses and the Au @@ and @@@ Sahweiß-und Bichtarbeiten increases considerably.

The invention is therefore based on the task of an undervoltage winding with two turns for transformers with very high electrical currents one To create an arrangement in which at the point of penetration of the two turns on the one hand the mechanical strength ensures @st and on the other hand an increase in the Z @ atzverluate avoided and an inexpensive production is made possible.

According to the invention, this object is achieved in that the circuit boards both windings at the beginning of the winding and at the end of the winding with their full cross-section Radially outwards over a fold, so that the four superimposed End stripping of the printed circuit boards immediately next to the bevels of the outer turn electrically isolated from each other, mechanically rigidly clamped and that the Penetration as well as the electrical connection required for the row scarf @@@ of the two turns on the side of the clamping point facing away from the turns lie.

According to advantageous embodiments of the invention, ditr are bevelled End strips of the circuit boards from nuts screwed onto threaded bolts Shim pieces are pressed onto spacers made of insulating material and are the threaded bolts out in the spacers. The shims are also made of insulating material and have means for securing the nuts against rotation.

According to further training features of the invention it is provided that the End strips of the inner turn have mutually offset recesses through which the remaining webs of the other end strip to the electrical Connection with the outer turn or lead to a winding input or that the recesses in the end strip of the inner turn serving as the winding input are designed as square windows that lead from the to the outer turn Stegen are assured.

In application of the winding according to the invention on a main and a Additional transformer with two independent active parts is 3e one of two windings connected electrically one behind the other, each with two turns.

The winding arrangement according to the invention is particularly advantageous, because the mechanical tension takes place at a point that still has the full winding conductor cross-section has, so that the full radial short-circuit forces even with large transformer powers be included. This includes the mechanical tension and the screw connection the electrically consecutively connected windings are spatially separated from each other in such a way that that the contact point is not stressed at all by the short-circuit forces that occur will. Another advantage is that all welding work on the high-current winding and the straightening work required by welding is omitted, so that the application the winding according to the invention is even advantageous in the cases with Consideration of the short-circuit forces that occur with one of the known solutions it is possible.

Using a drawing of exemplary embodiments, the invention explained in more detail.

FIG. 1 is a view in the axial direction and FIG. 2 is a view perpendicular to the winding ends of a winding according to the invention.

FIG. 3 shows a basic diagram for two windings connected in series with two turns each.

Each of the turns 1 and 2 consists of a sheet of metal, the width of which is equal to the winding length. For this purpose, the winding inputs will be used first the ends of these metal sheets showing at the right angle to the plane of the sheet.

Then the turns are then with the corresponding diameters gabogen to a cylinder jacket.

Along a line parallel to the bevel, the bevelled ones are lilac End strip holes for receiving spacers 3 and shims 6 are provided. The spacers 3 urid the lnterle g pieces 6 lead threaded bolts 4 on their Ends nuts 5 are screwed, which hold the assembled arrangement, For Avoid winding short circuits are both li. Spacers 3 as nuch the Shim pieces 6 made of insulating material.

The ends of the inner turn 1 face one another in the axial direction offset recesses 7, the other end strips of webs 8 of the Jewell are penetrated, in which the webs 8 nu @ one of the end strips along an axially parallel Line are bent at right angles. These bent webs 8 are screwed 12 firmly connected to one of the fnd strips of the outer turn 2, so that over the Output of the inner turn 1 and the input of the outer turn 2, the two turns 1 and 2 are electrically connected in series.

The non-angled webs 8 and the free end strip of the outer Turn 2 s @@ llen represent the winding inputs 9, the ends of the webs 8 in not illustrated manner by a conductor strip with each other can be connected so that the recess 7 get the shape of windows In FIG. 3 shows the windings 10 of a main transformer and the winding 11 of one Additional transformer with one inner turn 1 and one outer turn 2 electrically connected in series. For this purpose the outer turn 2 is the winding 11 for the additional transformer on the opposite of the winding inputs 9 Side divided along an axially parallel line. The resulting additional End strips are also folded outwards and with the. Winding received 9 connected to winding 10 of the main transformer.

Also with this winding arrangement for a main and an additional transformer are the means to absorb @er short-circuit forces from the Mittein to manufacture the electrical ver.

bond between the inner and outer turns separated so that Even with this arrangement, large short-circuit forces can be controlled.

6 claims 3 figures L e r s e i t e

Claims (6)

Claims: 1. Winding for transformers for very high electrical röms with two radially superimposed, through one along an axially parallel Line arranged penetration from turns electrically connected in series Printed circuit boards, the width of which is equal to the winding length, d u r c h g e k e It is noted that the circuit boards of both turns (1,2) are at the beginning of the turn and at the end with their want cross-section over a bevel radially outwards are performed that the four superimposed end strips of the circuit boards directly next to the folds of the outer turn; (2) electrically isolated from each other, mechanically rigid and that the penetration as well as the series connection required electrical connection of the two turns (1,2) on the turns (1,2) face away from the clamping point. 2. Winding according to claim 1, characterized in that the beveled End strips of the circuit boards from threaded bolts (4 screwed nuts (5) are pressed onto spacers (3) made of insulating material via shims (6), and since the threaded bolts (4) are guided in the spacers (3). 3. Winding according to claim 1 and 2, characterized in that the Shim pieces (6) also consist of insulating material. and means for securing the nuts (5) against rotation. 4. winding according to claim 1 to 3, characterized in that the End strips of the inner turn (1) have mutually offset recesses (7), through the remaining webs (8) of the other end strip to the electrical Lead the connection to the outer winding (2) or to a winding input (9). 5. winding according to claim 1 to 3, characterized in that the Recesses (7) in the one serving as the winding input (9) End strips of the turn (1) are designed as a window leading from the to the outer turn (2) guided webs (8) are penetrated. 6. winding according to claim 1 to 3 and one of claims 4 or 5, characterized in that one on each of two electrically connected in series Windings with two turns each one of two independent active parts One main and one additional transformer is assigned to each.