US3555404A - Tap-changing transformer system including vacuum switch units - Google Patents

Tap-changing transformer system including vacuum switch units Download PDF

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Publication number
US3555404A
US3555404A US834245A US3555404DA US3555404A US 3555404 A US3555404 A US 3555404A US 834245 A US834245 A US 834245A US 3555404D A US3555404D A US 3555404DA US 3555404 A US3555404 A US 3555404A
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United States
Prior art keywords
tap
vacuum switch
pair
changing
switch units
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Expired - Lifetime
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US834245A
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English (en)
Inventor
Alexander Bleibtreu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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Publication of US3555404A publication Critical patent/US3555404A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0038—Tap change devices making use of vacuum switches
    • 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

Definitions

  • the transformer proper with a tapped winding a selector switch for selecting the desired tap of the aforementioned winding and preparing its insertion into the circuit, and a transfer switch for performing tap-changing operations which means breaking current-carrying circuits and closing live circuits.
  • Current limiters such as impedances or resistors form also an integral part of any transfer switch.
  • Vacuum switch units require high contact pressures, e.g. a vacuum switch unit having a high currentcarrying capacity may require a contact pressure in the order of 600 lbs.
  • a tap-changing switching operation is performed by a fast acting spring-motor as, for instance, in so-called Janssen-type transfer switches, high contact pressures of the aforementioned order greatly complicate the design of the transfer-switch-operating spring-motor.
  • the present invention avoids the limitations and drawbacks of the aforementioned tap-changing systems including transfer switches having vacuum switch units. To be more specific, this invention aims to greatly reduce the contact pressures required for the vacuum switch unit,
  • a tap-changing transformer embodying this invention has a winding having at least one pair of contiguous taps.
  • Such a transformer further includes a first changeover switch having a pair of fixed contacts each conductively connected to one of said pair of taps and a movable con tact selectively engageable with each of said pair of fixed contacts and an intermediate position separate from said pair of fixed contacts.
  • the transformer further includes a second changeover switch having a pair of fixed contacts each conductively connected to one of said pair of taps and a movable contact selectively engageable with each of said pair of fixed contacts and having an intermediate position separate from said pair of fixed contacts.
  • a tap-changing transformer embodying this invention includes a first vacuum switch unit and a second vacuum switch unit.
  • a tap-changing transformer embodying this invention further includes conductor means for serially connecting said movable contact of said first changeover switch with said first vacuum switch unit and said second vacuum switch unit and conductor means for shunting said movable contact of said second changeover switch across said movable contact of said first changeover switch and said first vacuum switch unit and across said second vacuum switch unit and said resistor.
  • FIGS. 18 are circuit diagrams of tap-changing transformers and their tap-changing switching circuitry, the latter being shown in the several different positions thereof involved in a tap-changing operation;
  • FIG. 9 is a diagrammatic representation of the sequence of steps involved in a tap-changing operation.
  • FIG. 10 is a diagrammatic representation of the same circuitry as FIGS. 1-8 and further shows a drive for operating the constituent switch means of the system.
  • FIGS. 1 to 8, inclusive illustrate the consecutive steps involved in a tap-changing operation in a system embodying the present invention.
  • Reference character Tr has been applied to indicate a tapped winding of a transformer and reference character L has been applied to generally indicate a transfer switch for performing tap-changing operations.
  • the conventional selector switch which forms a necessary part of the system has been deleted in FIGS. 1-8 since showing of such a switch is not necessary for an understanding of the present invention.
  • a selector switch which may be added to the system of FIGS. 1-8 is fully disclosed in US. Pat. 3,176,- 089 to A. Bleibtreu, Mar. 30, 1965, for Load Tap Changers for Transformers and in US. Pat.
  • the taps A and B of winding Tr may be considered as a pair of contacts of a selector switch conductively connected to two contiguous taps of winding Tr.
  • the transfer switch L includes a pair of vacuum switch units C and D. The former is arranged in the main current path of transfer switch L and the latter is arranged in the auxiliary current path of transfer switch L in series with the switch over resistor R arranged in the aforementioned auxiliary current path. It will be apparent from FIG. 1 that the main current path including vacuum switch unit C and the auxiliary current path including vacuum switch unit D and switchover resistor R are arranged in parallel.
  • Each changeover switch E, F includes a pair of fixed contacts.
  • One of the fixed contacts of changeover switch E is conductively connected to tap A of winding Tr and the other fixed contact of changeover switch E is conductively connected to tap B.
  • one of the fixed contacts of changeover switch F is conductively connected to tap A of tapped winding Tr and the other fixed contact of changeover switch F is conductively connected to tap B of winding Tr.
  • Reference character Y has been applied to indicate an outgoing line.
  • the movable contact of current-carrying changeover switch E and lead b shunt both vacuum switch units C, D.
  • the movable contact of changeover switch F and lead a are arranged in series with vacuum switch units C, D.
  • a tap-changing operation from tap A to tap B is initiated by opening of changeover switch B so that neither of its fixed contacts is engaged by its movable contact.
  • the entire load current supplied by the transformer is carried for a short period of time by vacuum switch unit C.
  • This first step involved in a tap-changing operation has been illustrated in FIG. 2.
  • the next step in a tap-changing operation consists in engagement of the contacts of vacuum switch unit D, i.e. closing of the latter. This step involved in a tap-changing operation has been illustrated in FIG. 3.
  • vacuum switch unit D carries a current equal to the algebraic sum of the load current in outgoing line Y and a circulating current mainly determined by the voltage U between taps A and B and the magnitude of resistor R.
  • FIG. 9 appears to be substantially self-explanatory in view of the foregoing description of FIGS. 1 to 8, inclusive.
  • Each line D, E, F, C indicates the position of the switching devices D, E, F, C of FIGS. 1 to 8.
  • the vertical 4 lines 1, 2, 3 6, 7, 8 of FIG. 8 refer to the points of time shown in FIGS. 1 to 8, inclusive.
  • FIG. 10 includes a diagrammatic representation of a common drive for the constituting switching devices C,
  • FIG. 10 The positions of the switching devices C, D, E, F shown in FIG. 10 are the same as those shown in FIG. 1.
  • Reference numeral 11 has been applied in FIG. 10 to indicate a shaft which may be pivoted in clockwise direction 'by motor means such as a powerful spring motor (not shown).
  • Cams 12, 13, 14, 15 have different shapes and are fixedly mounted on shaft 11. Each cam controls a cam follower or roller.
  • cam 12 controls roller 16 which, in turn, controls operating rod 17 for vacuum switch unit C
  • cam 13 controls roller 18 which, in turn, controls operating rod 19 for vacuum switch unit D
  • cam 14 controls roller 20 which, in turn, controls operating rod 21 for pivoting the movable contact of changeover switch E
  • cam 15 controls roller 22 which, in turn, controls operating rod 23 for pivoting the movable contact of changeover switch F.
  • Operating rods 17, 19, 21, 23 may be biased in upward direction by spring means (not shown) to cause a precise determination of the positions of cam followers 16, 18, 20, 22 by the configuration of cams 12, 13, 14, 15.
  • a tap-changing transformer including (a) a tapped transformer winding (Tr) having at least one pair of contiguous taps (A, B);
  • a transfer switch including a pair of parallel-connected vacuum switch units (C, D), one of said pair of vacuum switch units (D) being connected in series with a current-limiting resistor (R), each of said pair of vacuum switch units (C, D) being arranged to be conductively connected by the intermediary of said pair of changeover switches (E, F) to each of said pair of taps (A, B), one of said pair of changeover switches (F) being arranged to establish a current path in series with said pair of parallel connected vacuum switch units (C, D) and the other of said pair of changeover switches (E) being arranged to establish a current-path parallel to said pair of vacuum switch units (C, D).
  • a tap-changing transformer as specified in claim 1 including a common drive (11) for operating said pair of changeover switches (E, 'F) and said pair of vacuum switch units (C, D) in predetermined sequences.
  • a tap-changing transformer including (a) a tapped transformer winding (Tr) having at least one pair of contiguous taps (A, B);
  • a first changeover switch having a pair of fixed contacts each conductively connected to one of said pair of taps (A, B) and a movable contact selectively engageable with each of said pair of fixed contacts and having an intermediate position sepavacuum switch unit (C) from said one (A) of said pair of taps (A, B) to said outgoing line (Y);
  • a method for performing a tap-changing operation 1164782 1969 Great f f 32343-5 on a tapped transformer winding including at least one 1,172,312 1969 Great Bntam pair of contiguous taps said method including the steps of (a) carrying current from one (A) of a contiguous J D MILLER Pnmary Exammer pair of taps (A, B) of a tapped transformer wind- G. GOLDBERG, Asssitant Examiner ing (Tr) by a first current path (E, b) to an out going line (Y) and simultaneously carrying current CLXR- by another parallel current path including a closed 336-

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Housings And Mounting Of Transformers (AREA)
US834245A 1968-07-05 1969-06-16 Tap-changing transformer system including vacuum switch units Expired - Lifetime US3555404A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1763623 1968-07-05

Publications (1)

Publication Number Publication Date
US3555404A true US3555404A (en) 1971-01-12

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US834245A Expired - Lifetime US3555404A (en) 1968-07-05 1969-06-16 Tap-changing transformer system including vacuum switch units

Country Status (6)

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US (1) US3555404A (de)
AT (1) AT289260B (de)
CH (1) CH492342A (de)
FR (1) FR2012399A1 (de)
GB (1) GB1224707A (de)
SE (1) SE354144B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4384247A (en) * 1981-05-08 1983-05-17 Trw Inc. Under-load switching device particularly adapted for voltage regulation and balance
US5128605A (en) * 1990-03-21 1992-07-07 Maschinenfabrik Reinhausen Gmbh Monitoring system for step-type switching transformer
CN104681322A (zh) * 2013-11-27 2015-06-03 Abb研究有限公司 分接头变换器
CN105304358A (zh) * 2014-07-03 2016-02-03 刘洪军 调压切换结束后真空管退出工作的真空有载分接开关

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020123455A1 (de) 2020-09-09 2022-03-10 Maschinenfabrik Reinhausen Gmbh Laststufenschalter und verfahren zur betätigung eines laststufenschalters

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4384247A (en) * 1981-05-08 1983-05-17 Trw Inc. Under-load switching device particularly adapted for voltage regulation and balance
US5128605A (en) * 1990-03-21 1992-07-07 Maschinenfabrik Reinhausen Gmbh Monitoring system for step-type switching transformer
CN104681322A (zh) * 2013-11-27 2015-06-03 Abb研究有限公司 分接头变换器
CN105304358A (zh) * 2014-07-03 2016-02-03 刘洪军 调压切换结束后真空管退出工作的真空有载分接开关
CN105304358B (zh) * 2014-07-03 2017-05-31 刘洪军 调压切换结束后真空管退出工作的真空有载分接开关

Also Published As

Publication number Publication date
GB1224707A (en) 1971-03-10
CH492342A (de) 1970-06-15
AT289260B (de) 1971-04-13
SE354144B (de) 1973-02-26
FR2012399A1 (de) 1970-03-20

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