US3374320A - Tap-changing device for transformers having load current diverter means and improved hydraulic follower mechanism therefor - Google Patents

Tap-changing device for transformers having load current diverter means and improved hydraulic follower mechanism therefor Download PDF

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Publication number
US3374320A
US3374320A US588824A US58882466A US3374320A US 3374320 A US3374320 A US 3374320A US 588824 A US588824 A US 588824A US 58882466 A US58882466 A US 58882466A US 3374320 A US3374320 A US 3374320A
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US
United States
Prior art keywords
contact
tap
contacts
main
quenching
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
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US588824A
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English (en)
Inventor
Buhler Karl
Trachsel Heinz
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BBC Brown Boveri AG Germany
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Bbc Brown Boveri & Cie
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Publication date
Application filed by Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US3374320A publication Critical patent/US3374320A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • 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
    • H01H9/0027—Operating mechanisms

Definitions

  • a switching mechanism for diverting current when changing taps on a transformer comprises a multi-armed oscillatable diverter switch actuated when a tap change is made.
  • One arm of the diverter switch controls a set of main contacts connected to the taps, two other arms control sets of quenching contacts in parallel with the main contacts and a fourth arm is articulated to piston elements of an oil-immersed hydraulic follower mechanism which includes a guide sleeve within which the pistons reciprocate, the guide sleeve itself also being reciprocated by the pistons within a stationary cylinder, and a contact arm articulated to the guide sleeve is oscillated by the latter to connect in a diverter resistance in the circuit of the main contacts.
  • the present invention relates to diverter switches for tap-changing switches of regulating transformers of the sort wherein the diverter switch consists of a main contact, a quenching (or load-switching) contact, and a lead contact for a diverter resistor, and the main and quenching contacts are rigidly coupled and are actuated in alternating directions by a driving arrangement.
  • the invention has the object of providing a simple and cheap solution for actuating the lead contact, wherein the wear resistance is high, in accordance with the switching frequency of a tap changer.
  • the lead contact which leads in both directions of movement, is so connected with the remaining contacts by means of a hydraulic follower mechanism that the lead contact is retained in its end positions after these have been reached, whilst the remaining contacts are directly driven by the actuator until they reach their end positions.
  • FIGURE 1 shows a diverter switch with a hydraulic follower device for the lead contact
  • FIGURE 2 shows another embodiment of the follower device, which acts simultaneously as oil damper for the moving masses.
  • FIGURE 1 shows a transformer winding 1 equipped with several taps, two of which are shown at 2 and 3. Between the taps and the diverterswitch, there is a known tap selector which has been omitted from the drawing for the sake of clarity, and which is not required for the understanding of the invention.
  • the star-shaped diverter switch part 4 is arranged to oscillate in a rotative manner in the directions of the arrows by a drive, not shown.
  • Contact arms 5, 6 form, together with the resiliently mounted fixed contacts 7, 8 the quenching or load-switching contacts of the diverter switch.
  • the part 4 has a further contact arm 9, which together with the contacts 10, 11 constitutes the main contacts, in parallel with the quenching contacts.
  • the arm 9 is connected to the outlet u for the selected voltage.
  • the lead contact consists of an insulating arm 13, pivoted at 12, and carrying a moving contact 14 which operates between fixed contacts 15, 16.
  • the contact 14 and the junction u are connected through a diverter resistor 17.
  • the part 4 has an arm 18, to which is articulated at 19 a connecting rod 20 which is connected in turn with two opposed pistons 21.
  • the pistons 21 fit closely in a slidable guide sleeve 22 which fits closely in a fixed cylinder 23'.
  • the said guide sleeve 22 has lateral orifices 24 at each end immediately adjacent to its end covers and further openings 25 located further inwards.
  • the lead contact 14 is pivotally connected at 26 to the guide sleeve 22. The whole assembly is immersed in oil.
  • arm 18 moves the two pistons 21 to the left; once the left piston 21 has passed beyond the orifice 25, the guide member 22 is carried along to the left, because the trapped oil inside the left-hand end of member 22 cannot escape.
  • This causes the arm 13 to be carried along, moving about its pivot 12 and the contact 14 is lifted off the contact 15 in the direction of contact 16. This occurs substantially simultaneously with the lifting of the arm 9 off the contact 10, whilst the quenching contact 5, 7 opens somewhat later.
  • the transmission ratio of the arms 9, 13, 18 is such that contact 14 switches to 16 before the arm 9 reaches the contact 11.
  • the lead contact 14 is held in position by the overpressure in the chamber to the left of the left piston 21 required to urge the oil out of the orifices 24.
  • the low pressure in the space to the right of the right-hand piston 21 also urges guide sleeve 22 to the left to hold contact 14 in position: after a short travel of sleeve 22 the righthand orifices 24 are closed and it is only at the end of the travel that the right-hand orifices 24 are opened so that the said space can be again filled with oil.
  • FIGURE 2 shows another hydraulic follower device in which the moving parts are braked in a simple manner during the last phase of the switching movement.
  • the orifices 24 of the follower device which is otherwise the same as described in conjunction with FIGURE 1, are positioned inwardly from their end caps by a certain amount towards the center and the pistons 21 are provided with an outlet groove 27.
  • this arrangement is adapted to produce a desired braking curve in that the starting point and the magnitude of the braking may be chosen according to the positions and dimensions of the orifices and the outlet groove.
  • This embodiment has the special advantage that a special oil damping device is no longer necessary.
  • a diverter switch for a tap-changing transformer comprising a set of main contacts having two stationary main contact members and a movable main contact member located therebetween, means for actuating said main movable contact member alternately in opposite directions so as to establish alternate engagement with said main stationary contacts, two sets of quenching contacts each of which includes stationary and movable contact members, said movable contact members of said quenching contacts being operated by said actuating means so as to effect disengagement therebetween subsequent to disengagement of said movable main contact member with a stationary main contact member, a set of lead contacts having two stationary lead contact members and a movable lead contact member located therebetween, each said stationary main contact member being electrically connected to a corresponding stationary quenching contact member and to a corresponding stationary lead contact member and to a corresponding tap point on said transformer, said movable main and quenching contact members being electrically interconnected, a diverter resistance connected between said main movable contact member and said movable lead contact member, and a reversible
  • each said piston includes a tapered outlet groove in the wall thereof cooperative with said end ports in said sleeve to effect a controlled braking action on said piston.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Actuator (AREA)
US588824A 1965-11-02 1966-10-24 Tap-changing device for transformers having load current diverter means and improved hydraulic follower mechanism therefor Expired - Lifetime US3374320A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1510365A CH428928A (de) 1965-11-02 1965-11-02 Einrichtung an einem Lastumschalter eines Stufenschalters für Regeltransformatoren

Publications (1)

Publication Number Publication Date
US3374320A true US3374320A (en) 1968-03-19

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ID=4406379

Family Applications (1)

Application Number Title Priority Date Filing Date
US588824A Expired - Lifetime US3374320A (en) 1965-11-02 1966-10-24 Tap-changing device for transformers having load current diverter means and improved hydraulic follower mechanism therefor

Country Status (8)

Country Link
US (1) US3374320A (enrdf_load_stackoverflow)
AT (1) AT261755B (enrdf_load_stackoverflow)
BE (1) BE689098A (enrdf_load_stackoverflow)
CH (1) CH428928A (enrdf_load_stackoverflow)
DE (1) DE1274226B (enrdf_load_stackoverflow)
FR (1) FR1498775A (enrdf_load_stackoverflow)
GB (1) GB1098147A (enrdf_load_stackoverflow)
SE (1) SE303549B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3536889A (en) * 1964-12-10 1970-10-27 Sachsenwerk Licht & Kraft Ag Electrical switch actuating mechanism
US3553395A (en) * 1969-01-21 1971-01-05 Westinghouse Electric Corp Vacuum switch operating mechanism with plural dashpot controller means
US3671698A (en) * 1969-07-11 1972-06-20 Bbc Brown Boveri & Cie Switch contact chamber for electrical circuit breakers of the gas blast type
US3798395A (en) * 1971-11-02 1974-03-19 Asea Ab Operating mechanism for tap changer switches
US4488022A (en) * 1981-11-12 1984-12-11 Mitsubishi Denki Kabushiki Kaisha Mechanism for adjusting the speed of displacement of an arc contact for a switching apparatus
US4681992A (en) * 1986-03-06 1987-07-21 C. M. Smillie & Company Cushioned clamp cylinder with proximity switches
US20160293325A1 (en) * 2013-12-05 2016-10-06 Maschinenfabrik Reinhausen Gmbh Electrical switching system for a three-phase network
EP4084032A1 (en) * 2021-04-28 2022-11-02 Hitachi Energy Switzerland AG Vacuum interrupter assembly for a power diverter switch, power diverter switch for a transformer load tap changer and transformer load tap changer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4243854A (en) * 1979-11-05 1981-01-06 Pahl Richard B Quick-break attachment for a pole-top air-break switch

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3536889A (en) * 1964-12-10 1970-10-27 Sachsenwerk Licht & Kraft Ag Electrical switch actuating mechanism
US3553395A (en) * 1969-01-21 1971-01-05 Westinghouse Electric Corp Vacuum switch operating mechanism with plural dashpot controller means
US3671698A (en) * 1969-07-11 1972-06-20 Bbc Brown Boveri & Cie Switch contact chamber for electrical circuit breakers of the gas blast type
US3798395A (en) * 1971-11-02 1974-03-19 Asea Ab Operating mechanism for tap changer switches
US4488022A (en) * 1981-11-12 1984-12-11 Mitsubishi Denki Kabushiki Kaisha Mechanism for adjusting the speed of displacement of an arc contact for a switching apparatus
US4681992A (en) * 1986-03-06 1987-07-21 C. M. Smillie & Company Cushioned clamp cylinder with proximity switches
US20160293325A1 (en) * 2013-12-05 2016-10-06 Maschinenfabrik Reinhausen Gmbh Electrical switching system for a three-phase network
US10176919B2 (en) * 2013-12-05 2019-01-08 Maschinenfabrik Reinhausen Gmbh Electrical switching system for a three-phase network
EP4084032A1 (en) * 2021-04-28 2022-11-02 Hitachi Energy Switzerland AG Vacuum interrupter assembly for a power diverter switch, power diverter switch for a transformer load tap changer and transformer load tap changer
WO2022228740A1 (en) * 2021-04-28 2022-11-03 Hitachi Energy Switzerland Ag Vacuum interrupter assembly for a power diverter switch, power diverter switch for a transformer load tap changer and transformer load tap changer
CN116670794A (zh) * 2021-04-28 2023-08-29 日立能源瑞士股份公司 用于功率转换开关的真空断续器组件、用于变压器负载抽头变换器的功率转换开关和变压器负载抽头变换器
US12131879B2 (en) 2021-04-28 2024-10-29 Hitachi Energy Ltd Vacuum interrupter module for a tap changer, power diverter switch, and tap changer

Also Published As

Publication number Publication date
CH428928A (de) 1967-01-31
DE1274226B (de) 1968-08-01
GB1098147A (en) 1968-01-10
FR1498775A (fr) 1967-10-20
BE689098A (enrdf_load_stackoverflow) 1967-03-31
AT261755B (de) 1968-05-10
SE303549B (enrdf_load_stackoverflow) 1968-09-02

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