DE2242318A1 - STEP SWITCH FOR A CONTROLLED TRANSFORMER FOR ENERGY TRANSPORT IN ONE DIRECTION - Google Patents

Description

E Ar / BW 28 ο ϋ. '', 972

Case 213 &: 1ι / Κΐ ·,

Smit Nijmegen Electrotechnische Fabrieken U.V. Groenestraat 336, -Iii; j3iegen, the Netherlands

"Step switch for an adjustable transformer for energy transport in one direction "

The invention relates to a tap changer for a controllable transformer for energy transport in one sighting, which step holder consists of two switchable parts, .strom] oa switchable pin selector, · one part of which is a block

309811/0762

with the even numbered taps of the l <egelwi cklung Transformer to be connected fixed contacts and a cooperating movable Schaltkontak't and its other Part a series with the odd numbered taps of these Has control winding to be connected fixed contacts and a cooperating movable switch contact, a Diverter switch with two fixed main switches, each directly connected to its own movable switching contact of the pin selector contacts, one fixed auxiliary contact arranged between these main contacts and one that works together with these fixed contacts, movable contact device, as well as bridging impedances and an associated auxiliary switching system for switching these bridging impedances either between the fixed auxiliary contacts and the one fixed main contact or between the fixed auxiliary contacts and the other fixed main contact of the load transfer device, which auxiliary transfer system and which load transfer switch work together in such a way that the transfer switch when switching, initially by connecting one already through the auxiliary switching system with only one of its fixed Main contacts connected impedance circuit with its other fixed main contact a bridging circuit between its brings about permanent main contacts and then interrupts this bridging circle again and that3 at the point where this bridging circuit is interrupted, the equalizing current and the main current are oppositely directed.

IAD ORIGINAL

309811/0765

A tap changer of this type is from the French Patent 1,362,902 (Pig. 3) is known. In this known tap changer is located between the fixed main contacts of the load door switch a single fixed auxiliary contact to which a bridging impedance is connected, which by means of a switch either with one or with the other fixed main contact can be connected ".

The invention is based on the object of increasing the switching capacity of a tap changer of this type and this is achieved in that between the fixed main contacts of the Las turas there is at least two during the switchover one after the other with the movable contact device of the on-load switch acting like a single switching contact Contact coming fixed auxiliary files are arranged SiEiO ₅ the j © via a Xmpedaözkreis .mit'dem by the auxiliary switching jet affl a fixed main contact of the load transfer unit trer burn the siacl, and that these circles are designed and switched by the auxiliary switching system SiOd ₉ that 'when switching over Load turn switch their impedances

if
are larger /. ^ ^ gfeigis the fait fixed connected to these circles

to the
Hilfskontaktd- to beisa / are densely fixed main contact _g with at a gear change UeberbrUckungakreis temporarily connected by the diverter switch, we do the gustandebririgen and interrupting the Ueberbrückungskreises therefore always find between a fixed main contact of the diverter switch and an end of Ueberbrtickungskreises instead. With the correct> choice of the impedances connected to the fixed auxiliary contacts, the load on the contacts of the diverter switch can be high

reduced and thereby the switching capacity of the tap changer. ' be enlarged.

It is noted that a diverter switch with several fixed auxiliary contacts between its fixed main contacts and with a number of different impedances connected between the auxiliary contacts and the main contacts, which are greater, vx ^ ä ^ & s / sf the auxiliary contacts to which they are connected, themselves poet

in the case of the ^N

IhBI stop are, on / of UeberbrUckungskreis by the diverter switch jg ^ ^ jfe jfe ^^ | ^ is 3raliä§few ^z ^ interrupted, from Swiss Patent 361,614 known ist.Bei this known diverter switch carried closing and interrupting the UeberbrUckungskreises rather than alternately at one and the other end of the bridging circuit only at a single point, namely in the middle of this circle, so that when energy is transported in only one single direction, the main current and the equalizing current are alternately directed in a bend in the same direction and in opposite directions. This severely limits the switching capacity of the diverter switch.

The tap changer according to the invention can be in different Ways to be executed. Palis the diverter switch with a an even number of fixed auxiliary contacts is provided, a construction can be used with one of the number of auxiliary contacts the same number of separate impedance circuits with different impedance values is present and the auxiliary switching system from one of the number of fixed auxiliary contacts plus one

30981 1/0762

Number of coupled auxiliary switch .besteht, one of which is between the interconnected one ends of all the impedance circuits and the two fixed main contacts of the load switch is connected and the other are each connected between a fixed auxiliary contact and the other ends of two impedance ^circuits; in such a way that the j

the . I.

Auxiliary contacts in / one position of the auxiliary changeover switch via circles ^:

. ι with increasing impedance values with one fixed main contact

the '' ■

and in / at the en position of the auxiliary switch over circles with decreasing Impedance values are connected to the other fixed main contact of the j diverter switch.

If the diverter switch is provided with an uneven number of fixed auxiliary contacts, the tap changer can be designed in such a way that one of the number of separate impedance circuits with different impedance values is the same as the number of auxiliary contacts, and the auxiliary switching system is made up of one of the number of auxiliary contacts that are coupled with the same number There is an auxiliary switch, one of which is connected between the interconnected one ends of all impedance circuits and the two fixed main contacts of the diverter switch and the remainder between a fixed auxiliary contact, except for the middle auxiliary contact, and the other ends of two impedance circuits, except for the one with the middle one Impedance value, are switched, and that the impedance circuit with the middle impedance value is connected with its other end directly to the middle fixed auxiliary contact, in such a way that the

309811/0762

SAD ORiGiNAL

open direction of movement of the movement

the changeover switch successive auxiliary contacts in / one position

the auxiliary switch via circles with increasing impedance values

the J

with one permanent main contact and in / other Sfcelljjngder HiI fs- j switch Over circles with decreasing impedance values with the other fixed main contact of the diverter switch are connected.

A tap changer with a smaller amount of impedance material than that required for the tap changers described above is necessary, can be achieved by connecting to each fixed auxiliary contact the diverter switch a separate impedance is connected, these impedances are the same, further one of the number of auxiliary contacts minus one equal number of parts connected in series existing impedance circuit is arranged and if that

Auxiliary changeover system consists of a number of coupled auxiliary changeover switches, one of which is between one end of this Impedance circuit and the two fixed main contacts of the switch is switched and the rest between an auxiliary contact, except for the middle one, if available, and the Ends of at least part of this impedance circuit are switched, while the middle auxiliary contact, if present, is directly connected to the center of this impedance circle in such a way that the des.- movable in a given direction of movement Switching contact of the diverter switch consecutive

the
Auxiliary contacts in / one actuator auxiliary changeover switch via circles

with increasing impedance values with one fixed main contact

the

and in / other position of the auxiliary switch over circles with decreasing Impednnttwerte with the other fixed main contact of the I.aot-

30981 1/0762

BATH ORIGINAL

- ΐ—

Changeover switch are connected.

A very simple design of the step switch is possible, if an impedance is connected between the auxiliary contacts of each pair of adjacent fixed auxiliary contacts of the diverter switch and an additional impedance is connected to each auxiliary contact located next to a fixed main contact of the diverter switch and if the emergency break system consists of two auxiliary switches, which are coupled in such a way that when one is opened the other is closed, of which auxiliary switches the one between the one additional impedance and the fixed main contact located next to the associated auxiliary contact and the other between the other additional impedance and the other fixed main contact. "is arranged",

A tap changer with a load changeover switch with two fixed auxiliary contacts can be designed in such a way that one equal impedance is connected to each auxiliary connector s two coupled auxiliary changeover switches consists of ^, "won. which the one end is connected between the interconnected one ends of all impedances and the two fixed main contacts of the load transfer device and "_ the other is connected on the one hand to the other end of the additional impedance and on the other hand to these fixed auxiliary contacts, in such a way that the in a given Direction of movement of the movable switch contact of the diverter switch

the
the following auxiliary contacts in / a Sfcelhrg of the auxiliary changeover switch

309811/0762

About circles with increasing impedance values with the one

the position of the fixed main contact and in / other ätfcxK * the auxiliary changeover switch About circles with decreasing impedance values with the other fixed Main contact of the diverter switch are connected. In this case, the auxiliary changeover system consists of only two coupled auxiliary changeover switches.

The invention will be explained in more detail with reference to the drawing. In the drawing is:

1 shows a schematic representation of a first embodiment a tap changer according to the invention, wherein the tap

_The switch is in a certain position,

Fig. 2 is a schematic representation of the tap changer according to Fig. 1 in another Position,

*
3 shows a schematic representation of a variant of the tap changer according to FIGS. 1 and 2,

4 shows a schematic representation of a second embodiment of a tap changer according to the invention »

5 shows an ochematic representation of a first variant of the step switch according to Fig. 4,

6 shows a schematic representation of a second variant of the stepped screen according to Fig. 4,

309811/0762

Pig. 7 shows a schematic representation of a third embodiment a tap changer according to the invention and

8 shows a schematic representation of a fourth embodiment such a tap changer.

In all figures of the drawing, A is the main winding and B 'is the fine control winding of a transformer. A precision selector consisting of two parts, which can only be switched without current, interacts with this precision control winding, one part of which is connected to a row of fixed contacts (not shown), which is connected to the odd-numbered taps 1,3,5,7,9 of the precision control winding B. and a movable contact 11 cooperating with these fixed contacts is provided ₉ and the other part is a series of fixed contacts (not shown) which are connected to the even-numbered taps 0,2,4,6,8 of the fine control winding 3, and a movable contact 10 cooperating with these fixed contacts.

In the Atisf clock ungs form according to Fig. 1 and 2 acts with the Fine selector a diverter switch together, which is arranged with fixed main contacts 12 and 13, two between these main contacts fixed auxiliary contacts 14 and 15 and one with these fixed Contacts cooperating movable switch contact 16 is provided is. The multiple switch, consisting of the fine selector and the diverter switch, is only used for transporting energy through the white arrow 17 indicated direction determined.

With the help of the auxiliary contact H, the movable switching contact

309011/0762

clock connected to an auxiliary switch 18, of which the left fixed contact with a bridging impedance 19 and the right fixed contact with a bridging impedance 20 is connected. The fixed auxiliary contact 15 is on the movable Switching contact of a second auxiliary switch 21 connected, of which the left fixed contact is connected to the impedance 20 and the right fixed contact to the impedance 19.

with, their other ends The impedances 19 and 20 are / xaejkfccx ^ he & cbe connected to the movable switching contact of a third auxiliary changeover switch 22, of which the left fixed contact with the fixed main contact of the diverter switch and with the movable switching contact 10 of the pin selector and the right fixed contact is connected to the fixed main contact 13 of the diverter switch and to the movable switching contact 11 of the fine selector. The bridging impedance 20 is greater than, for example, twice as large as the bridging impedance 19. The auxiliary changeover switches 18, 21, 22 are coupled to one another so that they can only be switched over at the same time.

In FIG. 1, the diverter switch is separated from the fixed main contact 13 to. fixed main contact 12, i.e. from the transformer tap to that, a fine voltage level higher, tapping 4 rustic

_n the position
switches. The voltage level between the taps 3 and 4 is bridged by the larger impedance 20 via the fixed auxiliary contact 15 of the switch, the auxiliary switches 21 and 22 and the movable switching contacts 10 and 11 of the FeirnvMhler. Y / uring the further movement of the; Switching contact is 16 dc «Ln r. Lurmjchal tem

30981 1/0762

BATH ORIGINAL

to the left is the bridging circuit with the impedance interrupted at C> J. At the moment of the interruption the flows Main current via main contact 13 to switching contact 16, while the equalizing current through the bridging circuit from Switching contact 16 to main contact 13, i.e. in the opposite direction, flows (see black arrow). The one to be interrupted Energy is severely limited by these opposing currents. The switching contact 16 is located exclusively on the auxiliary contact 15 »so the entire main current flows through the impedance 20. As soon as the switching contact 16 the Brings about connection between auxiliary contacts 14 and 15, a smaller part, e.g. a third of the main current, flows through the impedance 20 and a larger part, e.g. two-thirds of the main current, through the impedance 19 · The through the separation the contacts 16 and 15 to be interrupted energy is therefore also limited. If the switching contact 16 is on the auxiliary contact 14, the main stream flows exclusively through the smaller impedance 19 »but as soon as the switching contact 16 the Connection between the main contact and the auxiliary contact 14 has been established, the impedance 19 is short-circuited, so that the main current is then exclusively via '* - 3rd main contact 12 to the switching contact 16 flows and the separation of the contacts 16 and 14 are not associated with the interruption of an energy flow is. By using two fixed auxiliary contacts 14 »15 in the diverter switch and two impedances 19» 20, of which that (20) is the largest, which during the interruption, of the UeberbrückuriiTisstroaikreis is effective, the diverter switch Switching performance is very limited.

30981.1 / 0762

BATH ORIGINAL

• Muüö the tension of the outer circle «can be further increased, see above

while the Schnltkontakt 16 is in his * left

position
afcoxdfc is located on the main contact 12, all auxiliary switches 18,21,22 are switched over in the de-energized state and the movable switching contact 11 of the fine selector is then switched to the tap 5 of the control winding B in a de-energized state. The switching contact 16 of the diverter switch can then be switched to the right, ie back to the fixed main contact 13, as indicated in FIG. During this second changeover of the diverter switch, the larger impedance 20 is connected to the auxiliary contact 14 and the smaller impedance 19 is then connected to the auxiliary contact 15, so that the same thing happens as in the case of FIG. 1 with regard to the energy to be interrupted by the diverter switch.

It can be seen from the above that i'Ur the continued voltage regulation in a given direction the impedances 19 and 20 alternating with auxiliary contacts 14, 15 and 15, 14 must be connected.

The step switch according to FIG. 3 differs from that according to FIGS. 1 and 2 only in that the diverter switch is provided with three fixed auxiliary contacts instead of two and the middle auxiliary contact 23 is permanently connected to the movable switching contact of the switch 22 via a third impedance 24

Me impedance ' PΛ has a V.'ert which lies between the values of the impedances 19 and 20. i »ic Effect of this multiple switch: *

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BATH ORIGINAL

does not differ from that according to FIGS. 1 and 2.

It will be clear that switching the mean impedance

24 is not necessary.

Pig's tap changer. 4 has a diverter switch with
two fixed auxiliary contacts 14,15, one on each of each of them
Impedance 25 or 26 is permanently connected. These impedances
25.26 are the same size and they are each connected with a shift: 27.23. The left fixed contact of the switch 27 is
directly connected to the fixed main contact 12 of the diverter switch and the movable switching contact 10 of the fine selector.

The right fixed contact of the switch 27 is to a third

at their other end;

Impedance 29 connected, the Sfeäk ^ ßiS / with the movable contact

a third switch 30 is connected. The left fixed contact of the switch 28 \ is with the impedance 29 and the right one

Fixed contact of the same is with the fixed main contact 13 of the j diverter switch and with the movable switch contact 11 of the

Peinwählers connected. The left fixed contact of the switch 30
is connected to the main contact 12 and the switching contact 10, ¹

while the right fixed contact of this switch with the ι

Main contact 13 and the switching contact 11 is connected. {

In this step switch, the third impedance 29 is determined by the '

Changeover switch 27,28 either with the impedance 25 or with the impedance! ■

26 connected in series ·. The impedance 29 can be the impedances
$ 25.2 will be the same.

\ The on-load tap changer according to Pig. 5 essentially corresponds to the

^f each after - ß'ig. 4. But the Lffct to keep it is with four

/ 309811/0762

BATH ORIGINAL

^ ₄ _ 2247318

fixed auxiliary contacts 14,15,31,32. Also the two lying ones Auxiliary contacts 31, 32 are directly connected to impedances 33, 34 connected, which are equal to the impedances 25, 26. These impedances are further connected to changeover switches 35,36. With the switches 27,28,35,36 three series connected Impe-

u <} «'■ connected to 37,38,39. The circuit is such that ix / Oarge-

. position
set üisaodxthe changeover switch 27,28,35,36 the auxiliary contact 15 via the series connection of the impedances 26,37,38,39; the auxiliary contact 32, via the series connection of the impedances 34,38,39; the auxiliary contact 31 is connected to the movable contact of the auxiliary switch 30 via the series connection of the impedances 33, 39 and the auxiliary contact 14 only via the impedance 25. With the aid of the auxiliary changeover switches 27, 35, 36, 28, the impedances can be switched over in such a way that the auxiliary contact 14 has four; the auxiliary contact 31 via three and the auxiliary contact 32 via two series-connected impedances and that the auxiliary contact 15 can only be connected to the changeover switch 30 via the impedance 26.

The step switch according to FIG. 6 differs in this from the one according to Fig. 5 that the Lasiurns he receives with a fifth fixed auxiliary contact 40 is provided, the via a Impedance 41 is connected to the middle of an impedance consisting of four parts 42,43,44,45 connected in series. The parts 42,43,44,4 5 of this impedance can be achieved by the auxiliary switch Ä7,35,36,28 either separately or in groups in series with connected to the impedances 25, 33, 34, 26 to the fixed auxiliary contacts 14, 31, 32, 15 and 15, 32, 31, 14.

309811/0762 ^{BAD 0RIGfNAL}

The step switch according to Fig. 7. is with a diverter switch ^ see; which corresponds to that of the step holder according to FIG This load switch has the fixed auxiliary contacts 14,23,15 »between the auxiliary contacts 14 and 23 is an impedance 46 and between the auxiliary contacts 23 and 15 there is an impedance 47 switched. The impedances 46 and 47 are the same. The junction between the auxiliary contact 14 and the impedance 46 is with a third impedance 48 and the node between the auxiliary contact 15 and the ^ impedance 47 is connected to a fourth impedance 49. The impedance 48 is at one contact of a switch 50 connected, of which the other contact with the fixed main contact 12. of the diverter switch and the movable switching contact 10 of the fine selector is connected. In the same way, the impedance 49 is connected to one contact of a switch 51, of which the other contact with the fixed main contact 13 of the diverter switch and with the movable switch contact 11 of the fine selector connected is. The switches 50 and 51 are coupled such that when the switch 50 is on, the switch 51 is off, and vice versa. In the state of the tap changer shown, the fixed auxiliary contact 15 is via the series connection of the impedances 47, \ 48 the fixed auxiliary contact 23 over the series connection of the impedances 46,48 and the fixed auxiliary contact 1 £ * Via the impedance 48 with the main contact 12 and the Schaltkoutakt 10 connected. In the state in which the switches 50 and 51 are switched, .is the auxiliary contact 14 via the series connection of irpiedanzen 46,47,49 each auxiliary contact 23 via the ' Series connection of the impedances 47, 49 and the auxiliary contact 15 Via the "Jmi-cManzen 49 with the main contact 13 and the switching

: ■ -.- 3 0 981-1 / 0782

BATH ORIGINAL

contact 11 connected.

not shown

A / variant of the step switch according to FIG. 7 is possible, with a single impedance instead of the impedances 48 and 49 is arranged with their one. End via a help switch] either to the node between the auxiliary contact 14 and the impedance 46, or to the node between the auxiliary contact and the impedance 47 can be connected and which can be connected to its other end via an auxiliary switch with this auxiliary switch coupled second auxiliary changeover switch can be connected either to the main contact 12 or to the main contact 13.

In the embodiment of the tap changer according to FIG. 8 the diverter switch is provided with two fixed auxiliary contacts 14,15. The auxiliary contact 14 is via an impedance 52 with the

one
movable contact xfceec switch 55 and the auxiliary contact 15 is connected to the 'movable contact of the switch 55 via an impedance 54. One end is a third impedance 55

while also connected to serve the contact of the changeover switch 53, its other end

end

Via a second switch 56 either with the

thus auxiliary contact 14 or connected to auxiliary contact 15, xafcadranc can be connected in parallel to impedance 52 or parallel to impedance 54. If the impedances 52, 54, 55 are the same, then in the state of the step switch shown, the auxiliary contact is via the impedance 54 and the auxiliary contact 14 is via the impedances 52, 55 ^ connected in parallel, therefore via an impedance with half the value of that of the impedance 54, with the main contact 12 is connected to dom switch contact 10. For voltage regulation in der-Si-] ben U i chtu p.rs and Zurlick: soh -! .. l tun · ¹ , dcv. Diverter switch :; been

3 0 9 811/0762

BATH ORIGINAL

by switching the auxiliary switch 53 and 56 of the lliliu— contact 14 Via the impedance 52 and the auxiliary contact 15 Via the impedances 54.55 - ″ connected in parallel with the main contact 13 and the switching contact 15 connected. In this case, the auxiliary contact 15 is over an impedance with half the value of that of the impedances 52,54,55 are connected to the main contact 13 and the switching contact 11. Also the diverter switch of this tap changer can be provided with more than two fixed auxiliary contacts, but then there is an impractical large number of changeover switches for the parallel connection of the impedances necessary to increase or decrease impedances connected to the auxiliary contacts To achieve impedance values.

309811/0762

Claims (7)

Al Godfather η b a η ü pr Uc he M.) tap changer for an adjustable transformer for energy transport in one direction, which tap changer consists of two switchable parts, which can be disconnected from the power supply Fine selector, one part of which is a row with the even number ^ ten taps of the control winding of the transformer to be connected to fixed contacts and a cooperating with it movable switch contact and its other part a number (jet has NIIT the odd nummerren taps this Hegel winding to be connected to fixed contacts and a cooperating movable switching contact, a load changeover switch with two each with its own movable switching contact of the Peinwählers fixed main contacts directly connected to ₃ a disposed between these main contacts, fixed auxiliary contact and a fixed with these contacts cooperating, movable contact device, as well as bridging impedances and an associated auxiliary switching system for switching these bridging impedances either between the fixed auxiliary contacts and the one fixed main contact or between the fixed auxiliary contacts and the other fixed main contact of the diverter switch has which auxiliary switch system and various diverter switches work together the diverter switch when switching initially by connecting one already through the auxiliary hunrnchaltsyaterd with only one of its fixed main contact e connected impedance circuit with its other fixed main contact iö * l11 / om brings between its fixed main contacts into existence and then interrupts this UeberbrUckungskreis again, and that at the location where this UeberbrUckungskreis is directed opposite to ^ the compensating current and the main current is interrupted, characterized in that between the fixed main contacts of the load switch at least two when switching successively fixed auxiliary contacts which come into contact with the movable contact device of the load transfer switch acting like a single switching contact are arranged, which are each connected via an impedance circuit to the fixed main contact of the load transfer _{switch selected by the auxiliary transfer system A} and that these circuits are designed and switched by the auxiliary transfer system, that when switching over the diverter if ters your impedances are larger: $ 2fxifä # & SRiäixdie with these Fixed auxiliary contacts connected to circles are closer together Fixed main contact, with which when switching over the bridging circuit through the diverter switch temporarily is connected. 2. Step switch according to claim 1 with a diverter switch with an even number of fixed auxiliary contacts, characterized in that that one of the number of auxiliary contacts is the same number of separate impedance circuits with different impedance values and that the auxiliary switching system consists of one the number of fixed auxiliary contacts plus one equal number of coupled auxiliary changeover switches, one of which oiifMi the interconnected one ends of all 3 0 9 811/0 7 6? ' ^{Λ BATH} Impedance circuits and the two fixed main contacts of the diverter switch is switched and the rest of each between a fixed Auxiliary contact and the other ends of two impedance circuits are connected in such a way that the in a given direction of movement of the movable switching contact of the diverter switch η of the one position successive auxiliary contacts ian / icMaeöc üt & ock the auxiliary switch over circles with increasing impedance values with η the position of one fixed main contact and igt the other Sfciötstgfc the auxiliary switch Are connected to the other fixed main contact of the diverter switch via circles with decreasing impedance values. 3. Tap changer according to claim 1 with a diverter switch with an uneven number of fixed auxiliary contacts, characterized in that one of the number of auxiliary contacts is the same number of separate impedance circuits with different impedance values, the auxiliary switching system consists of one of the number of auxiliary contacts the same number of coupled auxiliary switches, one of which is connected between the one ends of all impedance circuits connected to each other and the two fixed main contacts of the diverter switch and the others are connected between a fixed auxiliary contact apart from the middle auxiliary contact and the other ends of two impedance circuits besides the one with the middle impedance value, and that the impedance circuit with the middle impedance word is connected with its other end directly to the middle fixed auxiliary contact, in such a way that the in a given direction of movement BATH ORIGINAL 30 9 a 1 1/0762 of the movable switching contact of the diverter switch _In the position following auxiliary contacts ± ai a ^ tSCKl of the auxiliary switch Over circles with increasing impedance values with the one _n the position Main contact, and üa / other ^ & iggSQx the Hilsum switch over prices are connected to the other fixed main contact of the diverter switch with decreasing impedance values. 4. Step switch according to claim 1, characterized in that a separate impedance is connected to each fixed auxiliary contact of the diverter switch, these impedances are identical, an impedance circuit consisting of one of the number of auxiliary contacts minus one equal number of parts connected in series is arranged and that The auxiliary changeover system consists of a number of coupled auxiliary changeover switches, one of which is connected between one end of this impedance circuit and the two fixed main contacts of the diverter switch and the remainder between an auxiliary contact, apart from the middle one, if present, and the ends of at least one part this impedance circuit are connected, while $ the middle auxiliary contact, if present, is directly connected to the middle of this impedance circuit, in such a way that the in a given direction of movement of the movable switching contact of the η of the ^{position of the} load changeover switch successive auxiliary contacts iweinen 3SSJgSQ the auxiliary changeover switch over circles with increasing impedance values η »dßV position with the one fixed main contact and ÜSivSnderen SStosnaä the auxiliary switch Connected via circles with decreasing impedance values to the other fecjten main contact of the diverter switch ^. 30981 1/0762 BAD ORIQtNgL 5. Tap switch according to claim 1, characterized gekennzei seframe that jedet between the auxiliary contacts: the pair of adjacent fixed auxiliary contacts connected in the diverter switch an impedance and to each adjacent to a fixed main contact of the load switch located auxiliary contact an additional impedance is connected, and that the Hilfsumschaltsystem of two auxiliary switches is composed which are coupled in such a way that when one is opened the other is closed, of which auxiliary switches the one between the one additional impedance and the fixed main contact lying next to the auxiliary contact connected to it and the other between the other additional impedance and the other fixed main contact is arranged. 6. Tap selector switch according to claim 1, characterized in that each pair of adjacent fixed auxiliary contacts of the load switch connected between the auxiliary contacts of an impedance and a \ additional impedance is arranged and that the Hilfsumschaltsystem of two coupled Hilfsumochaltern, of which the one between the one end of this additional impedance and the two fixed auxiliary contacts of the diverter switch located next to the fixed main contacts and the other is connected between the other end of the additional impedance and these fixed main contacts. 7. Tap switch according to claim 1 having a load changeover switch with 2.wei solid Hilfskcntakten, characterized gekennze ic HNET that to each contact a separate auxiliary impedance is connected, this 309811/0762 BATH ORIGINAL Impedances are the same and an additional impedance is arranged
and that the auxiliary circuit system consists of two coupled auxiliary inverters, one of which is between the interconnected one ends of all impedances and the two fixed ones
Main contacts of the diverter switch is switched and the other on the one hand with the other end of the additional impedance and
on the other hand is connected to these fixed auxiliary contacts, such that the movable in a given direction of movement
Switching contact of the diverter switch successive auxiliary contacts iii 'a S & i & yiä, the auxiliary changeover switch via circles with increasing impedance values with the one fixed main contact _n the AtU
and i · »(other &% &&&" the help sums he gets about circles with decreasing impedance values with the other fixed main contact of the diverter switch are connected. 30 9811/076? BATH ORIGINAL