US3247333A - Drive for step switches for regulating transformers, chokes and the like - Google Patents

Drive for step switches for regulating transformers, chokes and the like Download PDF

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Publication number
US3247333A
US3247333A US272451A US27245163A US3247333A US 3247333 A US3247333 A US 3247333A US 272451 A US272451 A US 272451A US 27245163 A US27245163 A US 27245163A US 3247333 A US3247333 A US 3247333A
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Prior art keywords
shaft
driving
drive shaft
gear
disc
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Expired - Lifetime
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US272451A
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English (en)
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Bruckhoff Hans
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BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
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BBC Brown Boveri France SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/40—Driving mechanisms, i.e. for transmitting driving force to the contacts using friction, toothed, or screw-and-nut gearing

Definitions

  • the invention concerns a tap changing device for regulating transformers, reactance coils, and the like, with transfer switches actuated by a jump drive, socalled jump transfer switches, and tap selector switches, whereby the jump transfer switches and tap selectors are provided with gears which act on the drive.
  • the movable switching contacts of the tap selectors with stationary counter switching contacts arranged on two tracks and connected to the taps on the winding are driven by an intermittent gear which is in the form of a Maltese cross movement or a roller gear.
  • an intermittent gear which is in the form of a Maltese cross movement or a roller gear.
  • a compulsory blocking device for the end position or a disengageable blocking device for the individual steps.
  • the driving side of the jump drive for the transfer switch is coupled either directly or by means of a simple spur or bevel gear to the driven side of the intermittent gear.
  • the gear possesses a planetary drive with a crank pin located eccentrically on a planet wheel, whereby the pin is connected mechanically to the driving side of the jump transfer switch.
  • FIG. 1 shows a constructional example of the new arrangement.
  • FIG. 2 is the diagram of connections which is referred to in the description of FIG. 1.
  • FIG. 3 shows a further diagram of connections for a modified method of operation of the arrangement according to FIG. 1.
  • the fixed contacts of the tap selector belonging to one circular track are indicated by l, 3, 5, 7, 9, 1i. and those of a second circular track by 2, 4, 6, it), 12.
  • Reference numeral 11b indicates the movable contact piece of the coarse selector which cooperates with stationary contact pieces 12a and 13.
  • the movable contact 15 of the selector which is associated with the odd number fixed contact pieces is in constant electrical connection with the slip-ring 17, whose lead 19 is located inside the hollow shaft 21, which in turn carries the contact piece 15.
  • the movable contact piece 14- is associated with the even-number fixed contact pieces and its slip-ring 16 is connected to the lead llfi which is also located inside the hollow shaft 21.
  • Contact piece 14 is carried by the hollow shaft 20 which surrounds the hollow shaft 21 concentrically.
  • Shaft 21 is rigidly connected to gear Wheel 23 and shaft 20 to gear wheel 22.
  • Gear wheels 22 and 23 mesh with gear Wheels 24 and 25 respectively, which in turn are joined by short shafts to gear wheels 26 and 27, the latter meshing with gear wheels 28 and 29 respectively.
  • the external drive of the tap changing drive which is not shown engages the driving shaft 33. at the coupling point 30, this shaft passing through the casing wall 32 (for example of a transformer) in a known manner.
  • the driving shaft 31 is connected at its lower end to a gear wheel 33 which engages a gear wheel 34.
  • the wheel 34 is fixed to the lower end of shaft 35 and gear wheel 36 to the upper end of this shaft.
  • Gear wheel 36 meshes with planet wheel 37 and the latter with a toothed wheel rim 3% which is inside the gear casing 39.
  • Planet Wheel 37 is fixed on a shaft 40 the upper end of which is offset and constructed in the form of a crank pin 41.
  • Numeral 42 indicates the path followed by a point on the crank pin axis, this being in the form of a hypocycloid with four reversal points a, b, c, d.
  • the planet wheel shaft 40 engages loosely with a hole in a driving disc 43 which is loosely mounted on shaft 35 and is provided with an arcuate slot 44 having a length corresponding to an angular rotation of 180 of the shaft 45.
  • Shaft 45 is rigidly joined to the stopping and cam wheels 46, 47 which in turn are loosely mounted on shaft 35.
  • Gear wheels 28 and 29 are arranged on auxiliary shafts 48 and 49 respectively which are supported in the casing 39 and carry the roller pairs 50 and 51 which are mutually displaced by 90", the lower pairs being at the same level as disc 47 and the upper pairs at the same level as disc 46.
  • the auxiliary shafts 48 and 49 as well as the roller pairs 50 and 51 are arranged symmetrically with reference to shaft 35.
  • the crank pin 41 is connected by the rod 52 to lever 53 which is fixed to the driving shaft 54 of the jump transfer switch 55.
  • This switch 55 is located inside a casing 56 and is not shown in FIG. 1.
  • the leads 1%, 19 for the tap selector pass through the casing 56 in an insulated manner at the points 57, 58.
  • the other electrical connections between the tap selector contacts 1 to 12, from the coarse selector contacts 11b, 12a, 13 to the regulating winding, and also the latter are for the sake of simplicity not shown in FIG. 1 (see FIG. 2).
  • the hollow shaft 21 carries the stopping and cam wheels 59, 60 for actuating the coarse selector.
  • the movable contact piece 11b is connected by way of shaft 61, wheel 62, driving belt 63, wheel 64, to the auxiliary shaft which carries the rollers 66 and 67, the upper group 66 being in the plane of disc 59 and the lower group in the plane of disc 60.
  • the various wheels and discs are shown in FIG. 1 with a much greater spacing in the axial direction than is actually the case in order to make the assembly clearer. In the actual construction these elements are arranged closely together in the form of a packet which occupies very little space.
  • the electrical diagram for the tap changing device of FIG. 1 is shown in FIG. 2, whereby the same reference numbers are used for corresponding elements.
  • the tap selector contacts 1 to 12 are connected to the corresponding winding taps To to 12a and the coarse selector contact r 13 to the tap 13a of the coarse step.
  • For the jump transfer switch 55 a known construction with five switching elements 55a to 55 and two change-over resistors 55g and 55h has been chosen by way of example, the output side of the tap changing device being indicated at u.
  • the method of operation of the arrangement is as follows: It is assumed that the position of the tap changing device shown in the drawing has been reached after a previous downward regulation where the selector contact 15 has moved from tap 9:: (FIG. 2) to 11a and the transfer switch 55 from lead 13 to lead N. For the next switching operation in the downward direction, it is necessary that first of all selector contact 14 should be moved to contact 12 and the transfer switch be then connected to lead 18.
  • the main driving shaft 31 is rotated in the direction indicated by the arrow, whereby by means of gear wheels 33, 34, shaft 35, gear wheel 36, planet wheel 37 in contact with the stationary spur ring 38, a rotational clockwise movement commences which causes the crank pin 41, starting from point a on the path 42, to move in the direction of the arrow to point 12.
  • This movement of the crank pin 41 is imparted to the driving shaft 54 of the jump transfer switch 55 by the rod 52 and lever 53. In the position shown, the jump mechanism of the transfer switch is released and lever 53 is in its right-hand end position.
  • crank pin 41 moves from point a on the path 42, where the crank arm forms a dead centre position with the rod 52, over point b to point on the path 42 where a dead centre position also occurs.
  • the jump change-over of the transfer switch 55 thus occurs for instance shortly before the reversal point 0 is reached, after the switch 14 of the tap selector is already in engagement with the fixed contact 12.
  • the change-over sequence of the individual switching elements 55a to 55 (FIG. 2) of the transfer switch 55 occurs in a known manner, namely 55c opens, 55:: closes, 55b closes and 550 of the other change-over contact closes.
  • the change-over of switching element 550 can occur relatively slowly, whilst the other switching elements operate in rapid succession with a sudden or jump action.
  • the movable contact 11b of the coarse selector must be brought on to fixed contact 13 which is connected to tap 13a (FIG. 2). This is achieved by means of discs 59, 60 and rollers 66, 67, shaft 65, pulley 64, belt 63, pulley 62 and shaft 61.
  • the winding part 120, 13a (FIG. 2) is so dimensioned that due to the series connection with the winding part 1a to lie: when compared with tap 12a just one tap jump is achieved.
  • the external drive is actuated in the reverse direction. All rotational movements then occur in the opposite direction to that indicated by the arrows. Starting from the position shown in FIG. 2, it is then only necessary to change over the jump transfer switch 55 from the lead 19 to the lead 18, without a selector contact being moved.
  • the sequence of events is as already described except that the direction of rotation of the parts in question is reversed.
  • each winding tap is always connected to two fixed switching contacts.
  • the taps 1 to 6 are connected on the one hand to the contacts 1a to 6a and on the other hand to the contact series 1b to 6b.
  • the other parts 14 to 19 and 55 correspond to those of FIGS. 1 and 2.
  • the gears 24, 26 and 25, 27 as variable speed gears, whereby the transmission ratio can be altered on the selector arms without having to make any changes in the rest of the tap changing device.
  • the parallel arrangement of the gear and tap selector shafts avoids the necessity of providing any direction-changing devices, so that the mechanical stresses occurring in the device are reduced to a minimum.
  • the arrangement shown in FIG. 1 can in certain cases be modified by providing separate gears for the transfer switch and selector switches instead of a single common gear. In this case the connection between the planet Wheel shaft 40 and the driving disc 43 is omitted.
  • the gear wheel pairs 33, 34 can be arranged above the gear wheel 36, this being easily possible by providing the upper end of shaft 36 with an extension.
  • Driving disc 43 can also be built as a gear wheel which is driven by a further gear wheel having a corresponding number of teeth and located for instance on the main shaft 31.
  • the new arrangement possesses the advantage that two different methods of operation for tap changing devices with jump transfer switches are possible whilst using to a very great extent the same elements.
  • By using a speed change gear the device can be adapted in a very simple manner to suit various numbers of taps and tap steps.
  • the production of such apparatus is thus very economical.
  • the compact assembly enables a considerable saving in space to be achieved, especially with multi-phase devices.
  • a jump transfer switch having a plurality of switching elements cooperative with two rotary tap selector switches, each said tap selector switch having a rotary contact arm and a plurality of stationary contacts engageable in succession by said contact arm, circuit means connecting said stationary contacts of said tap selector switches to the taps on said electrical apparatus and connecting said contact arms with the switching elements of said jump transfer switch, a main rotatable drive shaft, an externally toothed driving gear secured upon said drive shaft, a stationary internally toothed ring gear concentric with and surrounding said driving gear, a planet gear intermediate and meshed with said driving and ring gears, a driving disc arranged concentrically on but not secured to said drive shaft, said driving disc having a concentric 180 arcuate slot therein, a shaft extending from said planet gear and which includes a crank arm thereon, said planet gear shaft being secured to said driving disc for rotating the same as said planet gear rotates about the axi
  • a drive mechanism as defined in claim 1 for changing taps on electrical apparatus wherein said planet gear and the crank arm on the planet gear shaft are arranged such that the axis of said crank arm describes a closed hypocycloid path with four reversal points for one complete revolution of said planet gear.
  • a drive mechanism as defined in claim 1 for changing taps on electrical apparatus wherein said connecting means between said crank arm and said switching elements includes a drive rod, one end of which is connected to said crank arm and the other end being connected to a lever secured upon a drive shaft which actuates said switching elements.
  • a drive mechanism as defined in claim 3 for changing taps on electrical apparatus wherein saidplanet gear, crank arm and drive rod have a combined motion such that for each limit position of said lever and drive shaft actuating said switching elements, said crank arm is located approximately at the reversal points of the hypocycloidal path whereby said drive rod together with crank arm form a dead center.
  • a drive mechanism as defined in claim 1 for changing taps on electrical apparatus wherein said means connecting said auxiliary drive shafts with said rotary contact arms of said tap selector switches include an adjustable speed gearing.
  • a drive mechanism as defined in claim 1 for changing taps on electrical apparatus wherein all of said shafts are arranged parallel to one another.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transmission Devices (AREA)
US272451A 1962-04-19 1963-04-11 Drive for step switches for regulating transformers, chokes and the like Expired - Lifetime US3247333A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH480062A CH395243A (de) 1962-04-19 1962-04-19 Stufenschalteinrichtung

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US3247333A true US3247333A (en) 1966-04-19

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US (1) US3247333A (id)
BE (1) BE631167A (id)
CH (1) CH395243A (id)
DE (1) DE1189619B (id)
GB (1) GB1016064A (id)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3535476A (en) * 1967-08-14 1970-10-20 Collectron Corp Multi-speed encoder
US3761650A (en) * 1972-05-01 1973-09-25 Gen Electric Direct drive and stop mechanism for load tap changer
US3852553A (en) * 1973-08-02 1974-12-03 Westinghouse Electric Corp Vacuum switch with toggle assembly operating mechanism
WO2012038030A1 (de) * 2010-09-22 2012-03-29 Maschinenfabrik Reinhausen Gmbh Kraftspeicher für einen laststufenschalter

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3431252C2 (de) * 1984-08-24 1987-05-14 Georg Dr.-Ing. 8152 Feldkirchen-Westerham Spinner Schalterantrieb für einen Drehschalter
DE3840529A1 (de) * 1988-12-01 1990-06-07 Reinhausen Maschf Scheubeck Stufenwaehler fuer stufentransformatoren mit konzentrischen antriebswellen
DE102018208612A1 (de) * 2018-05-30 2019-12-05 Siemens Aktiengesellschaft Transformator
DE102022105034B3 (de) * 2022-03-03 2023-06-07 Maschinenfabrik Reinhausen Gmbh Laststufenschalter und Stufentransformator mit Laststufenschalter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1980220A (en) * 1930-09-27 1934-11-13 Bell Telephone Labor Inc Intermittent feed device
FR850924A (fr) * 1938-09-05 1939-12-29 Forges Ateliers Const Electr Perfectionnement aux commutateurs de prises en charge pour transformateurs faisant usage d'un sélecteur de prises
US2484576A (en) * 1946-03-28 1949-10-11 Gen Electric Interphase winding and ratio adjuster switching arrangement for polyphase transformers
US2693573A (en) * 1950-12-21 1954-11-02 Moloney Electric Company Transformer on-load tap changing mechanisms

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1980220A (en) * 1930-09-27 1934-11-13 Bell Telephone Labor Inc Intermittent feed device
FR850924A (fr) * 1938-09-05 1939-12-29 Forges Ateliers Const Electr Perfectionnement aux commutateurs de prises en charge pour transformateurs faisant usage d'un sélecteur de prises
US2484576A (en) * 1946-03-28 1949-10-11 Gen Electric Interphase winding and ratio adjuster switching arrangement for polyphase transformers
US2693573A (en) * 1950-12-21 1954-11-02 Moloney Electric Company Transformer on-load tap changing mechanisms

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3535476A (en) * 1967-08-14 1970-10-20 Collectron Corp Multi-speed encoder
US3761650A (en) * 1972-05-01 1973-09-25 Gen Electric Direct drive and stop mechanism for load tap changer
US3852553A (en) * 1973-08-02 1974-12-03 Westinghouse Electric Corp Vacuum switch with toggle assembly operating mechanism
WO2012038030A1 (de) * 2010-09-22 2012-03-29 Maschinenfabrik Reinhausen Gmbh Kraftspeicher für einen laststufenschalter

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Publication number Publication date
BE631167A (id)
DE1189619B (de) 1965-03-25
CH395243A (de) 1965-07-15
GB1016064A (en) 1966-01-05

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