DE1282172B - Multi-turn tap winding or tap winding consisting of successive groups of turns for step transformers - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. C] .:

HOIf

German class: 21 d2- 53/02

Number: 1 282 172

File number: P 12 82 172.6-32 (L 48826)

Filing date: September 21, 1964

Open date: November 7, 1968

It is well known that transformers often require windings that consist of several partial windings exist, whereby one or more partial windings can optionally be switched on or off. However, switching the partial windings on or off should not result in asymmetry, therefore the partial windings are distributed symmetrically over the entire winding length so that when switching out any number of partial windings still have a symmetry in relation to the winding center, consists.

This happens z. B. when using layer windings in that about η groups of turns are produced so that at the same time η turns are wound parallel to a spiral winding so that η are formed winding turns. These winding turns are then connected in series that the lower end of a gear is connected to the upper end of the adjoining gear. You can now tap the beginning and end of each gear so that each gear can be switched on or off without changing the symmetry. Such windings are now preferably used as step windings for transformers in which a partial winding has the meaning of a step.

In the case of switchable total windings for two or more voltages, a subdivision into axially lined up coil groups are made, with corresponding series or The desired voltage is set in parallel connection of the coil groups.

F i g. 1 shows a known example of a transformer with an external step winding 11, the coarse steps 13, the high-voltage winding, follow inwards 14 and the low voltage winding 15. The core 16 is in the center.

The individual turns wound up as steps are labeled 1 to 5 (n = 5). The wires 1 to 5 are wound together like a turn 12 to form a layer. 12 is the period of the successive wires 1, 3, 5, 4, 2. Further details of the known circuit, in particular the switching connection which causes the stages to be connected in series, are shown in FIG. 2 can be seen. It can be seen that η = 3 here and that between the neighboring wires of the step winding 11 there is always twice the step voltage or 2 / η times the winding voltage if m is the number of turns of a step and if adjacent wires are in the order of the unge -Multiple courses or from consecutive courses
Existing winding groups
Tap winding for step transformers

Applicant:

Licentia Patent-Verwaltungs-G. m. b. H.,

6000 Frankfurt, Theodor-Stern-Kai 1

Named as inventor:
Dipl.-Math. Gottfried Broszat,
7051 Hegnach, Germany

even numbers and then in the decreasing order of the even numbers or vice versa are interconnected.

For example, FIG. 1 shows an example that in order to wind η = 5 steps for the step winding 11, five parallel turns with the designation 1 to 5 have to be wound together to form one layer. In the more detailed explanatory example F i g. 2, on the other hand, only η = 3 steps are provided for the step winding 11, so that only three turns have to be wound parallel to the layer 11. Each turn can in turn consist of several parallel wires.

In Fig. 2, the diversions that cause the series connection of the stages are now with the Numbers 2 ", 3" and 4. "They are tapped and lead to the taps 2 ', 3', 4 ', while the first tap 1 'is led directly to the beginning of the first turn of stage 1. If you choose the Diversion connections according to FIG. 2, i. H. according to the rule above, the turns are located of the stages in the order 1, 3, 2 next to each other. In Fig. 1 the turns of the five stages are in in the order 1, 3, 5, 4, 2 next to each other. With the usual new or thirteen stages, their recording is omitted here for the sake of simplicity, the steps would be in the order 1, 3, 5, 7, 9, 8, 6, 4, 2, or 1, 3, 5, 7, 9, 11, 13, 12, 10, 8, 6, 4, 2 are next to each other.

It can be seen that through this rule of the stages to be connected one after the other, the above in words is taken, it is ensured that actually no greater voltage than that between neighboring windings double step voltage occurs. But now it is

809 630/632

double step voltage is often very high and then requires good capacitive coupling of the two gears - as in FIG. 2 shown in more detail - one quite step. However, the electrical strength, considerable wire insulation 18 and between all of the winding insulation must be taken into account here. Intermediate layers inserted in the neighboring turns 17. In the case of a multi-turn or

In the case of very large setting ranges, the tap voltage that exists in the following 5 winding groups is used especially in the case of shock processes with processing for step transformers, in which the cut wave so high that an economical individual turns or groups of turns Borrowed design of the insulation between adjacent ones either in series or in series or Turns is no longer guaranteed. Either switchable in parallel and in the order of the wire insulation 18 would have to be chosen so strong, io increasing odd numbers and then in that the wires can no longer be bent or the order of the decreasing even numbers that when bending the insulation would burst, or are arranged vice versa, the Spanes If so many intermediate layers 17 were to be seen in between the pre-stressing of the turns or turns that one layer for the step group insulation would be reduced if the inventive winding would no longer do. 15 according to the number of turns or turns

With both measures, the requirement for groups would be greater by a factor of k than the number η of winding space, especially in the case of very high voltage of the tapping stages, where k and η are integer rows, intolerably high. and k is greater than 1.

When switching for different voltages, Figs. 3 and 4 are examples of the invention

Trans-20 consisting of groups of windings drawn. In both cases, the special case of formator windings is shown, the interconnection of a step winding, in which the individual winding groups or coils take place in such a way that winding turns represent the individual steps. It is that between locally adjacent coils a multiple are the same designations as in FIG. 1 selected, times the single coil voltage occurs, the step winding 11 consisting of η - 5 steps is the same problem, since the same scheme recurs, 25 is wound with k · η = 10 parallel wires. Instead of one turn there is now a coil consisting of many turns , which is a special case treated with k - 2. 4, on the other hand, corresponds in the designation

It is already a switching coil for transformers F i g. 2 and deals with a step winding 11 with or choke coils with η steps and m parallel η = 3 steps. Here again, instead of branches consisting of two partial coils, the 30 three parallel turns k η = 6 parallel windings are wound from several conductors, namely as follows: fertilize wound Qc - 2, n ~ 3). In both of them they play a multi-course Fig. 3 and 4 was therefore for the purpose of the

Reducing the tension between the neighboring

(Total number = ™ ' ⁿ | bare wires on the & th part opposite to FIG. 1

\ 2/35 and 2 have a number = k · η of the wires in parallel

wound and subsequently to k η aisles behind

Form winding screw and the conductors of the two are connected to one another, of which k turns are combined into one stage sub-coils via end connections.

are bound, at which the beginning of the head of the That is possible, if it is observed that the

first voltage level of one coil section and the 40 adjacent turns in the beginning of the series of the conductor of the first voltage level the sequence of increasing odd numbers and expanding Partial coil as well as the ends of the conductors of the closing in the order of the even numbers, last voltage level of the two sub-coils with d. H. in the example F i g. 3 in the order 1, 3, 5, 7, the first and the last tap changer contact 9, 10, 8, 6, 4, 2 and in FIG. 4 in sequence 1, are each connected via separate leads and 45 3, 5, 6, 4, 2 are interconnected, see above at which end connections in per se known that between the neighboring wires at most the

forming and belonging to the other sub-coil that the voltage between the adjacent

Connect aisle and face connections with the same potential 50 opposite windings in Fig. 3 and 4 respectively

fertilize each separately to the corresponding Fig. 1 and 2 is halved, as in both examples

other tap changer contacts. k = 2 was chosen. This makes it possible to use the in

This particular coil arrangement is intended to be shown in FIG. 2 between the windings

Saving on reel diversions, in particular omitting inserted intermediate layers 17 as well as

those that are performed via the tap changer, 55 to keep the insulation 18 much lower, such as

when arranging several parallel branches. Now that can be seen from FIG. 4. In Fig. 4 are

are spatially spaced parallel branches, in turn, the diversions 2 "to 7" drawn, the

always afflicted with a different scatter, the series connection of the invention

so that special measures and special care and thus halving the tension between

falt to achieve the same current distribution, see the turns compared to FIG. 2,

must be turned. The examples shown for the step winding

Multi-turn coils with one behind the other are also provided with partial windings on others

The corridors through which the flow passes are already known, especially types of windings can be used. So you can

in particular to flatten the initial distribution of, for example, in FIG. 4 the individual turns 1,

Surge voltages. In this case, par- 65 2, 3 etc. can also be imagined as individual coil windings and

allelic conductors are wound, the parallel receives the same advantages for the coil winding as

Head of one gear with the parallel conductors in Fig. 4 for the layer winding. In Fig. 4 are

of the second gear are nested, so that one then three groups of turns with the taps Γ

up to 4 '. These three groups of turns can now, for example, optionally be connected in parallel or in series, or omitted, without the symmetry, based on the winding center, being disturbed. When switching such groups of windings, in which each group of windings has an operating voltage of 110 kV, for example, you will have to isolate the coil connection between each group of windings for 110 kV without the inventive design of the series connection, but after applying the inventive idea you will choose the surge voltage that with normal wire insulation and normal cooling channels between two neighboring coils, and choose the number k of winding groups (partial windings) to be passed through so large that the voltage between all neighboring coils is at most as high as the calculated impulse withstand voltage with minimal effort.

For such coil windings subdivided into several groups _ao , there is no need for any greater insulation expenditure than for a normal coil winding and therefore requires considerably less winding space than in the previously known solutions. The only thing to note with this inventive solution is that the more the number of diversions 2 ", 2 '" , etc. is increased, the smaller the winding space is made possible. It is therefore advantageous to place the winding to be designed according to the inventive idea on the outside so that the accommodation of the diversions in the space outside the windings does not cause any difficulties.

The advantage of the invention is that there is a slightly increased effort for the diversions is made possible, especially between the transformers particularly high operating voltage To be able to manufacture partial windings with normal insulation and normal effort.

Furthermore, transformers with a very high setting range can be built in the same way as transformers with, for example, half the known setting range. This saves the changing room both a significantly lower overall weight and smaller copper losses from the transformer.

Claims (1)

Claim: Multi-turn or tap winding consisting of consecutive groups of turns for step transformers, in which the individual turns or groups of turns can be switched in series or in series or in parallel and are arranged in the order of the increasing odd numbers and then in the order of the decreasing even numbers or vice versa, characterized in that the number of turns or groups of turns is greater by a factor of k than the number η of tapping stages, where k and η are integers and k is greater than 1. Considered publications:
German Patent No. 948 628;
German interpretative document No. 1177 243. 1 sheet of drawings 809 630/632 10.65 Q Bundesdruckerei Berlin