US3805087A - Tap-changing transfer switch having series breaks and means for controlling the recovery voltage between breaks - Google Patents

Tap-changing transfer switch having series breaks and means for controlling the recovery voltage between breaks Download PDF

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Publication number
US3805087A
US3805087A US00365642A US36564273A US3805087A US 3805087 A US3805087 A US 3805087A US 00365642 A US00365642 A US 00365642A US 36564273 A US36564273 A US 36564273A US 3805087 A US3805087 A US 3805087A
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United States
Prior art keywords
pair
tap
load current
current path
auxiliary
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Expired - Lifetime
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US00365642A
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English (en)
Inventor
W Breuer
A Bleibtreu
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Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices

Definitions

  • FIGS BACKGROUND OF THE INVENTION refers to tap-changing transfer switches, and more particularly tap-changing transfer switches of the Jansen type which include ohmic tapchanging or change-over resistors which are inserted circuit is continuously derived from one and the same tap of a tapped transformer winding. Tap-changing transfer switches of the aforementioned kind are well known in the art and are described in considerabledetail in U.S. Pat. No. 3,176,089 to A. Bleibtreu et al.,
  • a tap changing regulating transformer includes the three following units: (a) a tapped transformer wind- ,ing; (b) a transfer switchproper for switching load currents including overload currents; and (c) a selector switch interposed between the tapped transformer winding and the transfer switch proper for selecting the particular taps to be switched.
  • This invention can be fully, understood without reference to the selector switch circuitry, and a consideration of its presence has, therefore, been deleted from what follows. It may be mentioned, however,thatselector switches and the way in which such switches are associated with a transformer winding and with a transfer switch proper is disclosed in the above referred-to patent to A. Bleibtreu et a]. t
  • Transfer switches embodying this invention include means establishing a first load current branch extending from a first transformer winding tap to a load, and means establishing a second load current branch extending from a second transformer winding tap to said load.
  • Each said first load current branch and said second load current branch include a main current path and an auxiliary current path parallel to said main current path.
  • Said main current path and said auxiliary current path of each said first and second load current branch are provided with at least two serially arranged switch means having relatively'movable contacts forming series'breaks inthe open positions thereof.
  • the auxiliary current path of said first and said second load current branch each include a tap-changing or switch-over resistor.
  • the switch-over resistorof said first load current branch is inserted betweenthe tap end of saidfirst load current branch and said switch means of the auxiliary current path thereof.
  • the switch-over resistor of said second load current branch is inserted between thetap end of said second load current branch and said switch means in the auxiliary current path thereof.
  • Transfer switches embodying this invention further include a pair of potential control resistors for controlling the potential distribution in said main current path of said first and said second load current branch.
  • Each of said pair of potential control resistors conductively interconnects one point situated between the two ends of said switch-over resistor of said first and second load current branch with one point situated between two of said serially arranged switch means in said main current path of said first and second load current branch.
  • Transfer switches embodying this invention further include an additional pair of potential control resistors for controlling the potential distribution in said auxiliary current path of said first and second load current branch.
  • One of said pair of additional potential control resistors conductively interconnects the tap end of said first load current branch with a point of said auxiliary current path of said second load current branch situated between said switch means thereof.
  • the other of said pair of additional potential control resistors conductively interconnects the tap end of said second load current branch with a point of said auxiliary current path of said first load current branch situated between said switch means thereof.
  • FIG. 1 is a diagrammatic representation of a tapchanging transfer switch embodying the present invention, FIG. 1 showing the switch in one of its two limit positions;
  • FIG. 2 shows the same switch as FIG. 1 and in the same fashion as FIG. 1 and shows the constituent parts thereof in a first intermediate position between its two limit positions;
  • FIG. 3 shows the same switch in FIG. 1 in the same fashion as FIG. 1 and shows the constituent parts thereof in a second intermediate position between its two limit positions;
  • FIG. 4 shows the same switch as FIG. 1 in the same fashion as FIG. 1 and shows the constituent parts thereof in a third intermediate position between its two limit positions;
  • FIG. 5 shows the same switch as FIG. 1 in the same fashion as FIG. 1 and shows the constituent parts thereof in the other of its two limit positions.
  • load current branch L includes the main current path II and the auxiliary current path IV arranged parallel to the main current path II.
  • the main current path I is provided with at least two serially conpositions thereof.
  • the main current path 'II of current branch L is provided with at least two spur the open positions thereof.
  • the auxiliary current path III is provided with at least two serially connected auxiliary switch means III, and III, having relatively movable contacts and forming series breaks in the open position thereof.
  • the auxiliary current path IV is provided with at least two serially connected auxiliary switch means IV, and IV, having relatively movable contacts and forming series breaks in the open positions thereof.
  • Reference characters R, and R have been applied to indicate a pair of switch-over resistors, or tap-changing resistors, which are inserted into the load circuit when performing a tap-changing operation from tap U, to tap U,, or from tap U, to tap U,.
  • Resistor R is inserted between tap U, and switch means III,, III,
  • switch means IV, 1V Resistor R is subdivided into two seri-' ally connected resistor portions R,, and R,, and a tap is formed between the two resistor portions R,, and R,,.
  • switch-over or tap-changing resistor R is subdivided into two resistor portions R,,, and R,, and
  • Switch means I, and I are supposed to open and to close simultaneously, and to this end they may be tied together mechanically as indicated in the drawings by a dotted line.
  • the first step in performing a tap-changing operation from tap U, to tapU consists in simultaneously closing auxiliary switch means III, and III, in auxiliary current path III and shortly thereafter simultaneously opening main switch means I, and I, in main current path I.
  • This position of parts is shown in FIG. 2.
  • Closing of switch means III, and III results in a voltage drop across resistor R,. That voltage drop is used along with the voltage drop along potential control resistor R, for controlling or equalizing the potential across main switch means I, and 1,.
  • the latter switch means open an arc may be formed across each of the resulting breaks, but such arcs extinguish at the first current zero.
  • the next step in performing a tap-changing operation from tap U, to tap U consists in closing the two auxiliary switch means IV, and IV, in auxiliary current path IV, resulting in the position of parts shown in FIG. 3. In that position there is, in addition to the flow of the load current to the load not shown a flow of a circulating current from tap U, through registor R, and switch means III, and III, and resistor R, and switch means IV, and IV, to tap U
  • the magnitude of that circulating current is limited by the sum of resistors R, and R,.
  • the recovery voltage across the separated contacts of switch means llll corresponds to the voltage drop across switch-over resistor R
  • the magnitude switch-over resistor R may be determined in such a way that the voltage drop along switch-over resistor R is equal to the voltage normally prevailing between contiguous taps U and U
  • the recovery voltage appearing across the separated contacts of switch means lll is equal to the difference in potential between taps U and U since the voltage of tap U is' applied by means of resistor R to the point between switches III, and 111 Hence the recovery voltage is evenly distributed across the two breaks formed by auxiliary switch means III and lli I
  • the next step in performing a tap-changing operation from tap U to tap U consists in simultaneously closing the main contact means Ill and ll This establishes'a direct current path from tap U, to the load (not shown).
  • auxiliary switch means IV, and W are opened simultaneously. No arcing occurs when these switchmeans are opened since the current path II forms a very low resistance shunt across the current path IV. Opening of contact means IV and 1V terminates the tap-changing operation from tap U, to tap U.
  • the second limit position of the transfer switch when the entire load current is derived only from tap U is shown in FIG. 5.
  • the transfer switch does dequire any additional switch means for the control of the recovery voltage across its four pairs of switch means I, and 1 II, and ll lll and Illand IV, and W i.e. it does not require any additional switch means for switching either of the potential control resistors R R and R R
  • the tap-changing operation from tap U to tap U does not need to be described specifically since the consecutive steps involved in this operation are apparent from what has been described above. Suffice it to this invention further include two pairs of jointly movable main switch means 1,, I and llhllg having relatively movable contacts.
  • One pair I,,I of said two pairs of main switch means l l ll ll is arranged in series in said main current path I of said first load current branch L and forms series breaks in the open positions thereof;
  • the other pair ll ll of said main switch means is arranged in series in the main current path II of said second load current branch L and forms series breaks in the open positions thereof.
  • Systems embodying this invention further include two pairs of jointly movable auxiliary switch means lll lll and IV lV having relatively movable contacts.
  • One pair III,,III of said two pairs of auxiliary switch means lll lll IV IV is arranged in series in said auxiliary current path III of said first load current branch L, and forms series breaks in the open positions thereof.
  • the other pair IV,,IV of said two pairs of auxiliary switch means lll lll and l-V,,IV is arranged in series in the auxiliary current path IV of said second load current branch L and forms series breaks in the open positions thereof.
  • Systems embodying this invention further include a pair of switch-over resistors R R One of said pair of switch-over or tap-changing resistors R R is interposed between said first tap U and auxiliary switch means lll lll The other switch-over or tap-changing resistor R is interposed between tap U and switch means IV ,lV
  • Systems embodying this invention further include a pair of potential control resistors R ,R for controlling the potential distribution in said main current path I of said-first load current branch L, and in said main current path ll of said second load current branch L
  • One of said pair of potential control resistors R R interconnectsconductively one point situated between the ends of switch-over resistor R, with a point situated between main switch means I, and I
  • the other of said pair of potential control resistors R 11 conductively interconnects one point situated between the ends of switch-over resistor R, with a point situated between main switch means Il and IE
  • Systems embodying this invention further include an for controlling the potential distribution in'said auxiliary current path III of the first load current branch L,
  • systems embodying the present invention include a tapped transformer winding having a first tap U and a contiguous second tap [1,. Such systems further include a first load current branch L, for conductively connecting said first tap U to aload, and a second load current branch L, for conductively connecting said second tap U to a load.
  • Each said first load current branch L, and said second load current branch L include a main current path I and II, and an auxiliary current path III and IV parallel to said main current path.
  • Systems embodying first tap U, with a point situated between auxiliary switch means IV; and W The other of said additional pair of potential control resistors conductively interconnects the second tap U, with a point situated between auxiliary switch means lll and lll We claim as our invention:
  • a tap-changing transfer switch for tapped transformer windings having series breaks and means for controlling the recovery voltage between breaks comprising in combination a. means establishing a first load current branch from a first transformer tap to a load;
  • each said first load current branch and said second load current branch including a main current path and an auxiliary current path parallel to said main current path, each said main current path and said auxiliary current path being provided with at least two serially arranged switch means having relatively movable contacts forming series breaks in the open positions thereof, and said auxiliary current path of said first and second load current branch each including a switch-over resistor, said switch-over resistor of said first load current branch being inserted between the tap end of said first load current branch and said switch means of the auxiliary current path thereof, and said switchover resistor of said second load current branch being inserted between the tap end of said second load current branch and said switch meansin the auxiliary current-path thereof;
  • each of said pair of potential control resistors conductively interconnecting one point situated between the two ends of said switch-over resistor of said first and second load current branch with one point situated between two of said serially arranged switch means in said main current path of said first and second load current branch;
  • an additional pair of potential control resistors for controlling the potential distribution in said auxiliary current path of said first and second load current branch, one of said pair of additional potential control resistors conductively connecting the tap end of said first load current branch with a point of the auxiliary current path of said second load'current branch situated between said swith means thereof, and the other of said pair of additional potential control resistors conductively connecting the tap end of said second load current branch with a point of the auxiliary current path of said'tirst load current branch situated between said switch means thereof.
  • a first load current branch for conductively conseries in said main current path of said first load current branch and forming series breaks in the open positions thereof and the other pair of said two pairs of main switch means being arranged in series in the main current path of said second load current branch and forming series breaks in the open positions thereof;
  • two pairs of jointly movable auxiliary switch means having relatively movable contacts, one pair of said two pairs of auxiliary switch means being arranged in series in said auxiliary current path of said first load current branch and forming series breaks in the open positions thereof and the other pair of said two pairs of auxiliary switch means being arranged in series in the auxiliary current path of said second load current branch and forming series breaks in the open positions thereof; a pair of switch-over resistors, one of said pair of switch-over resistors being interposed between said first tap and said one pair of auxiliary switch means and the other of said pair of switch-over resistors being interposed between said second tap and said other pair of auxiliary switch means;
  • a pair of potential control resistors for controlling the potential distribution in said main current path of said first load current branch and in said main current path of said second load current branch, one of said pair of potential control resistors conductively interconnecting one point situated between the ends of said one of said pair of switchover resistors with one point situated between said one pair of said two pairs of main switch means and the other of said pair of potential control resistors conductively interconnecting one point situated between the ends of said other of said pair of switch-over resistors with one point situated between said other pair of said two pairs of main switch means; and
  • an additional pair of potential control resistors for controlling the potential distribution in said auxiliary current path of said first load current branch and in said auxiliary current path of said second load current branch, one of said additional pair of potential control resistors conductively interconnecting said first tap with a point situated between said other pair of said two pairs of auxiliary switch means and the other of said additional pair of potential control resistors conductively interconnecting said second tap with a point situated between said one pair of saidtwo pairs of auxiliary switch means.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Attenuators (AREA)
  • Control Of Electrical Variables (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US00365642A 1972-06-20 1973-05-31 Tap-changing transfer switch having series breaks and means for controlling the recovery voltage between breaks Expired - Lifetime US3805087A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2230007A DE2230007C2 (de) 1972-06-20 1972-06-20 Schaltanordnung für Lastumschalter von Stufentransformatoren

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US3805087A true US3805087A (en) 1974-04-16

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US (1) US3805087A (de)
JP (1) JPS5240728B2 (de)
AT (1) AT323846B (de)
BG (1) BG24679A3 (de)
CH (1) CH549271A (de)
DE (1) DE2230007C2 (de)
FR (1) FR2189929B1 (de)
GB (1) GB1399700A (de)
NL (1) NL154861B (de)
SE (1) SE378324B (de)
SU (1) SU546297A3 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5491316A (en) * 1977-12-28 1979-07-19 Matsushita Electric Ind Co Ltd Diaphragm for speaker
JP2007326611A (ja) * 2006-06-08 2007-12-20 Sigma Shigyo Kk 包装容器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3174097A (en) * 1962-02-08 1965-03-16 Reinhausen Maschf Scheubeck Transfer switch for tap changers for regulating transformers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3174097A (en) * 1962-02-08 1965-03-16 Reinhausen Maschf Scheubeck Transfer switch for tap changers for regulating transformers

Also Published As

Publication number Publication date
SU546297A3 (ru) 1977-02-05
JPS4957323A (de) 1974-06-04
CH549271A (de) 1974-05-15
FR2189929B1 (de) 1978-06-30
DE2230007C2 (de) 1974-07-18
GB1399700A (en) 1975-07-02
FR2189929A1 (de) 1974-01-25
DE2230007B1 (de) 1973-12-20
NL154861B (nl) 1977-10-17
BG24679A3 (en) 1978-04-12
NL7308428A (de) 1973-12-27
SE378324B (de) 1975-08-25
JPS5240728B2 (de) 1977-10-14
AT323846B (de) 1975-07-25
DE2230007A1 (de) 1973-12-20

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