US3628128A - Step-switching arrangement - Google Patents

Step-switching arrangement Download PDF

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Publication number
US3628128A
US3628128A US17071A US3628128DA US3628128A US 3628128 A US3628128 A US 3628128A US 17071 A US17071 A US 17071A US 3628128D A US3628128D A US 3628128DA US 3628128 A US3628128 A US 3628128A
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US
United States
Prior art keywords
switch
contacts
movable contact
loadline
contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US17071A
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English (en)
Inventor
Karl Buhler
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.)
BBC Brown Boveri AG Germany
Original Assignee
Bbc Brown Boveri & Cie
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CH362269A external-priority patent/CH497081A/de
Application filed by Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US3628128A publication Critical patent/US3628128A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • 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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
    • H02H7/055—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers for tapped transformers or tap-changing means thereof

Definitions

  • a step-switching arrangement for changing the taps on a transformer winding without interrupting the flow of current from the winding to a loadline includes a first switch and a resistance connected in series therewith extending from the transformer tap-changing contacts to the loadline which is paralleled by a changeover switch and vacuum switch connected in series therewith also extending from the transformer tap changing contacts to the loadline.
  • a circulating current through the switches and resistance and part of the transformer winding occurs during a change in taps and this circulating current is normally interrupted by opening the contacts oithe vacuum switch.
  • This invention relates to a step-switching arrangement forchanging the taps on a transformer winding wherein the individual voltage steps desired by shifting from one tap to another on the winding are preselected by a step selector in conjunction with a first switch connected via a switchover current-limiting resistance in series therewith to the transformer loadline, the series circuit connection of the first switch and current-limiting resistance being paralleled by another circuit consisting of a vacuum switch in series with a changeover switch.
  • a control device for step transformers where the tap can be preselected, without current, by a step selector and the uninterrupted load switching occurs by way of a switchover resistance and a vacuum switch, a mechanical changeover switch being assigned to each.
  • the actuation of the two mechanical switches and of the vacuum switch can, in this case, be effected by means of a mechanical drive transmission, or pneumatically, as disclosed in Swiss Pat. No. 448,257.
  • the design of the load switch of a stepswitching device as a vacuum switch in itself advantageous, presupposes the use of commercial vacuum circuit elements manufactured in large quantities, which are provided without special additional devices for monitoring their operability.
  • a pressure-sensitive chamber connected with the interior of the evacuated bulb which, upon a rise in. pressure in the interior of the bulb, (leakage with penetration of liquid), blocks the actuating device of the element, in the case of closed contacts.
  • Such an arrangement is disclosed in Swiss Pat. No. 460,121.
  • there are causes other than loss of vacuum which may lead to premature failure of the vacuum switch,
  • the problem underlying the present invention is to make it possible to utilize structurally simple, and inexpensive commercially available vacuum circuit elements in a stepswitching device without having to fear that failures of any kind of the vacuum circuit element, which lead to a reduction of the operational efficiency, in particular of the switching capacity, entail consequent damage to the step switch and transformer.
  • this problem is solved in that the changeover switch connected in series with the vacuum switch is provided not only with a pair of main switching contacts which lead to correspondingly assigned movable contacts along the taps on the transformer winding, but also a pair of auxiliary contacts each connected by way of an auxiliary circuit including a fuse to a corresponding one of the movable contacts along the taps of the transformer winding.
  • the arrangement is such that when the vacuum switch is operating in its normal manner, the main switching contacts operate in series with the vacuum switch and the latter functions to interrupt a circulating current which flows through the switching devices and part of the transformer winding during a changeover from one tap to another.
  • the vacuum switch fails to perform its function of interrupting the circulating current, then as the changeover switch is actuated, the circulating current'is shifted to one of the auxiliary contacts thus redirecting flow of the circulating current through one of the auxiliary fuse-containing circuits and the fuse then blows so as to break the flow of the circulating current.
  • FIG. of which is an electrical schematic.
  • the tapped transformer winding is indicated at 5, and the taps along the winding are designated a through e.
  • Taps a, c and e are associated with one tap selector movable contact member 6, and tap I) located intermediate taps a and c, and tap 11 located intermediate taps c and e are associated with another tap selector movable contact'member 7.
  • the movable contact members 6 and 7 are associated respectively with and move along in contact with conductor rails 6a and 7a.
  • Conductor rail 6a is connected to contact 12 of a first switch 15 and conductor rail 7a is connected to contact 13 of this switch 15.
  • the switch arm 15a is movable back and forth between contacts 12 and I3, and is connected through a current-limiting resistance element 2 to the loadline U.
  • Conductor rail 6a is also connected to one main switching contact 8 of a changeover switch 14, and conductor rail 7a is connected to another main switching contact 11 of switch 14.
  • the switch arm 14a is movable back and forth between the main switching contacts 8 and 11 and is connected through a vacuum switch I to the loadline U.
  • the changeover switch 14 includes two auxiliary contacts 9 and 10 located in the path of the switch arm 14a between contacts 8 and 11. Connected in an auxiliary circuit with auxiliary contact 9 is a fuse 3 which connects with the circuit leading to the conductor rail 6a, and in a similar manner, a fuse 4 is connected in an auxiliary circuit leading from auxiliary contact 10 to conductor rail 7a.
  • the step selector mechanism which moves the contact members 6 and 7 along the taps of the transformer winding is of conventional construction and hence has not been detailed as to its specific mechanism.
  • the electrical schematic shows, for example, that tap selector contact 6 is located on tap c of the transformer winding 5 and tap selector 7 on tap b.
  • Switch 15 is in the position indicated on the drawing wherein switch arm 15a in the solid line position is engaged with contact 12.
  • Switch I4 is in the position indicated wherein switch arm Na in the solid line position is engaged with the main switching contact 8.
  • the contacts of the vacuum switch 1 are closed and hence a circuit is completed from transformer winding tap c to the loadline U which can be traced from conductor rail 6a through switch contact 8, switch arm 14a and switch 1.
  • Another circuit to loadline U is also completed from conductor rail 6a through switch contact [2, switch arm 15:: and resistance 2 but this circuit will carry very little current due to the presence of the resistance 2 and the fact that the circuit through switches 14 and l practically short circuits the circuit path through switch 15.
  • switch 15 In order to change over from tap c to the next tap b on the transformer winding 5, switch 15 is actuated to shift contact arm 15a to contact 13. This completes temporarily a circuit from conductor rail 7a through switch 15, resistance 2, vacuum switch 1 and switch 14 to conductor rail 6a thus causing a circulating current, limited by the resistance 2, to flowin that portion of the transformer winding 5 between taps c and b. Assuming that the vacuum switch 1 is not defective, the next step in the changeover sequence is for vacuum switch 1 to open thus interrupting the flow of circulatory current through part of the transformer winding, and also commutating the flow of the load current to the line U from contact member 6 to contact member 7 of the tap selector.
  • Vacuum switch then recloses its contacts and the changeover switch 14 is actuated so that contact arm 14a now engages the main switching contact ll, and a direct path from tap b to the line U is completed through the series connection of the two switches 14 and l.
  • contact arm 144 during the course of its shifting from contact ll tocontact l0 activates the auxiliary circuit through fuse 4 thus to interrupt the circulation current in the event that vacuum switch 1 failed to open its contacts during a tap-changing operation wherein switch is shifted from the broken line position (contact 13) to the solid line position (contact 12) in going from a transformer tap controlled by movable contact 7 to one controlled by movable contact 6.
  • fuses 3 and 4 remain'intact as switch arm 14a shifts from contact 8 to contact 11, or vice versa, since no current was caused to flow through them.
  • one of the two fuses 3, or 4 melts and effects the desired current interruption.
  • the fuse thus takes over the function of the failing vacuum switch 1 when it does not succeed in interrupting the circulation current.
  • the two switches 14 and 15 are depicted as single interrupters. Alternatively, they may, in known manner be constituted as switches of the dual interrupter type which are actuated in the correct sequence, for example, by means of a corresponding cam plate mechanism. Also, actuation of the vacuum switch 1 may be controlled in such manner. it is also desirable, if one of the fuses 3 or 4 responds in the case of a disturbance (depending upon the direction of movement of changeover switch 14) to block any further actuation of the transformer winding tap selector mechanism by means of a device associated with the fuse, which provides a recognizable signal when the fuse blows to open the circuit through it, e.g. a strike pin common in fuses ofthe Hi-i" type.
  • a tap selector mechanism including at least two contact members movable sequentially along different taps of the transformer winding, a first switch including two stationary contacts connected respectively with said movable contact members of said tap selector mechanism and a movable contact member selectively connectible with said stationary switch contacts, a resistance element connected in series with said first switch to a loadline a changeover switch including two stationary main switching contacts connected respectively with said movable contact members of said tap selector mechanism and a movable contact member selectably connectible with said main switching contacts, a vacuum switch connected in series with said changeover switch to said loadline, said changeover switch further including a pair of stationary auxiliary switching contacts located intermediate said main switching contacts in the path of travel of said movable contact member, and an auxiliary circuit extending between each of said auxiliary switching contacts and a respective one of said movable contact members of said tap selector mechanism, each said auxiliary circuit including a fuse element

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
US17071A 1969-03-11 1970-03-06 Step-switching arrangement Expired - Lifetime US3628128A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH362269A CH497081A (de) 1969-03-11 1969-03-11 Stufenschalteinrichtung für Anzapftransformatoren

Publications (1)

Publication Number Publication Date
US3628128A true US3628128A (en) 1971-12-14

Family

ID=4259933

Family Applications (1)

Application Number Title Priority Date Filing Date
US17071A Expired - Lifetime US3628128A (en) 1969-03-11 1970-03-06 Step-switching arrangement

Country Status (4)

Country Link
US (1) US3628128A (enrdf_load_stackoverflow)
JP (1) JPS4932565B1 (enrdf_load_stackoverflow)
NL (1) NL161292C (enrdf_load_stackoverflow)
SE (1) SE352980B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735243A (en) * 1972-04-03 1973-05-22 Gen Electric Control system for tap changer with vacuum interrupter
US4081741A (en) * 1975-10-29 1978-03-28 Asea Aktiebolag On-load tap changer
US4384247A (en) * 1981-05-08 1983-05-17 Trw Inc. Under-load switching device particularly adapted for voltage regulation and balance
US5516992A (en) * 1992-05-15 1996-05-14 Maschinenfabrik Reinhausen Gmbh Transformer tap changing and step switch assembly
US5523674A (en) * 1992-07-16 1996-06-04 Maschinenfabrik Reinhausen Gmbh Step switch

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2272377B1 (enrdf_load_stackoverflow) * 1974-05-24 1977-06-24 Texas Instruments France
JPS5133342U (enrdf_load_stackoverflow) * 1974-09-02 1976-03-11
JPS5156973U (enrdf_load_stackoverflow) * 1974-10-28 1976-05-04
JPS5159284A (en) * 1974-11-20 1976-05-24 Matsushita Electric Industrial Co Ltd Hikariketsugosochi
JPS5256566U (enrdf_load_stackoverflow) * 1975-10-22 1977-04-23
JPS53164771U (enrdf_load_stackoverflow) * 1977-05-30 1978-12-23
JPS5412689A (en) * 1977-06-30 1979-01-30 Omron Tateisi Electronics Co Photo coupler
JPS5457885A (en) * 1977-10-17 1979-05-10 Omron Tateisi Electronics Co Reflection type photo coupler
JPS5630774A (en) * 1979-08-23 1981-03-27 Fujitsu General Ltd Optical coupler

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164689A (en) * 1960-04-15 1965-01-05 Acec Voltage regulation tap selector switch with radial contact means
US3206580A (en) * 1962-08-28 1965-09-14 Gen Electric Fluid immersed tap changing switching system for transformers
US3359485A (en) * 1963-09-27 1967-12-19 Bbc Brown Boveri & Cie Tap changing device for transformer windings without interrupting the load current
US3493847A (en) * 1965-12-01 1970-02-03 English Electric Co Ltd On-load tap changing circuits

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164689A (en) * 1960-04-15 1965-01-05 Acec Voltage regulation tap selector switch with radial contact means
US3206580A (en) * 1962-08-28 1965-09-14 Gen Electric Fluid immersed tap changing switching system for transformers
US3359485A (en) * 1963-09-27 1967-12-19 Bbc Brown Boveri & Cie Tap changing device for transformer windings without interrupting the load current
US3493847A (en) * 1965-12-01 1970-02-03 English Electric Co Ltd On-load tap changing circuits

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735243A (en) * 1972-04-03 1973-05-22 Gen Electric Control system for tap changer with vacuum interrupter
US4081741A (en) * 1975-10-29 1978-03-28 Asea Aktiebolag On-load tap changer
US4384247A (en) * 1981-05-08 1983-05-17 Trw Inc. Under-load switching device particularly adapted for voltage regulation and balance
US5516992A (en) * 1992-05-15 1996-05-14 Maschinenfabrik Reinhausen Gmbh Transformer tap changing and step switch assembly
US5523674A (en) * 1992-07-16 1996-06-04 Maschinenfabrik Reinhausen Gmbh Step switch

Also Published As

Publication number Publication date
JPS4932565B1 (enrdf_load_stackoverflow) 1974-08-31
SE352980B (enrdf_load_stackoverflow) 1973-01-15
NL7003287A (enrdf_load_stackoverflow) 1970-09-15
NL161292C (nl) 1980-01-15

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