US3824355A - De-energized tap changer for transformers with polyphase sliding contact assembly - Google Patents
De-energized tap changer for transformers with polyphase sliding contact assembly Download PDFInfo
- Publication number
- US3824355A US3824355A US00367098A US36709873A US3824355A US 3824355 A US3824355 A US 3824355A US 00367098 A US00367098 A US 00367098A US 36709873 A US36709873 A US 36709873A US 3824355 A US3824355 A US 3824355A
- Authority
- US
- United States
- Prior art keywords
- slide
- tap changer
- contact
- frame
- recesses
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H15/00—Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch
- H01H15/02—Details
- H01H15/06—Movable parts; Contacts mounted thereon
- H01H15/08—Contact arrangements for providing make-before-break operation, e.g. for on-load tap-changing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
- H01H1/42—Knife-and-clip 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 tie-energized tap changer for transformers comprises a frame of insulating material, a slide which carries movable contacts, the slide being displaceable in the frame, and a drive for the slide.
- the frame of the tap changer is manufactured in one piece and consists of a terminal "bar with attachment means for connections from the transformer windings, a carrier member carrying the drive, and cross-bars connecting the terminal bar and the carrier member.
- the movable slide is displaceable in grooves in the cross-bars and can be inserted in the grooves only when situated outside its ordinary working area.
- the present invention relates' to a de-energized tap changer for transformers and comprises a frame of in- I sulating material, a slide having movable contacts, said slide being displaceable in the frame, and drive means for the slide.
- the frame manufactured in one piece, comprises a terminal bar with attachment means for connections from the transformer windings, a carrier member supported by crossbars from the drive means and grooves arranged in the cross-bars for the movable slide.
- the tap changer can be modified so that it can be used both for linear and zig-zag connection ofthe control winding and for Y or D connection of the transformer.
- the tap changer includes a frame of insulating material which has cross-bars and a carrier member forming parts of the frame, the cross-bars supporting the carrier member at a distance from the terminal bar.
- a slide with contacts thereon is displaceably mounted in the frame for engagement with connections from the transformer windings.
- the contacts on the slide have contact surfaces, one contact surface being of a length less than the distance between two adjacent stationary contacts while the other contact surface is at least as long as a distance between two stationary contacts.
- the contactsmounted on the slide can be turned upside down for zig-zag connection.
- FIG. I shows the deenergized tap changer assembled for linear connection and with connection means for only one phase.
- FIG. 2 shows a side view of the slide.
- FIG. 3 is a section along the line lll-Ill in FIG. I and shows a cross-section through a movable contact on the slide.
- FIG. 4 is a section along the line IV-IV in FIG. I to show how the slide is fitted in a cross-bar.
- Each pin has a peripheral groove 8 and, when the pin is fully inserted in the tube, the sleeve is pressed into the groove so that the pin and sleeve are joined together and the pin is securely anchored in the frame.
- the pins are made of aluminium. This is particularly suitable if the transformer winding is also of aluminium since contact pressure between conductor and pin then permits a reliable connection to be achieved very quickly.
- the pin 3 is designed partially in the form of a socket into which the transformer-conductor 4 is inserted and the socket is pressed around the conductor in known manner. The free end of the pin, which projects out of the tube is silver-plated in order to give the best possible current-transmitting properties between the pin and the movable contact.
- the slide 9 is displaceable in the two cross-bars 6 and has three movable contacts 10, one for each phase.
- the construction of the contacts can be seen best in FIG. 3 which is a section along the line IIIIII in FIG. 1.
- Each contact is attached in the slide with the help of two lugs 11 which may be moulded in one piece with the slide or attached to theslide in some known manner.
- the contact consists of two parallel-trapezoidal contact piecesl2, kept in place between the lugs with the help of two guide pins 13 passing through the contact pieces and nonrotatably mounted in the lugs.
- the contact pieces are kept at the correct distance from each other by a spacer l4 and pressed against this spacer by two compression springs 15 which abut the contact piece with-one end and are arranged in a groove 16 on each of the. lugs 11 at the other end.
- Each contact piece has on one flat surface two raised contact surfaces 17 and 18, respectively, one of which, 17, is located in the vicinity of the shorter of thetwo parallel edges of the contact piece while the other contact surface, 18, is located in the vicinity of the long, parallel edge of the piece.
- FIG. I shows that the short contact surface is in contact with one of the contact pins 3.
- the length of the short contact surface should be less than the free distance between two adjacent stationary contacts so that it can never connect two such contacts together.
- the length of the contact surface 18 should be at least I as long as the distance between the centers of two adjacent stationary contacts so that it can connect two adja cent stationary contacts together.
- the fourth stationary contact from the right is joined to a busbar 19 which in turn is connected to a terminal pin 20 furthest to the left in the group of contact pins in the terminal bar.
- the short contact surface I7 is then in contact with the stationary contact and the long contact surface 18 is in contact with the busbar 19.
- the three terminal pins 20, one for each phase are connected in known manner to earth or to a zero point. How this is done is immaterial for an understanding of the invention.
- the busbar 19, one for each phase is attached by one end to the terminal pin 20 and by the other end to the frame. ln'FIG. l the bar is assumed to be a tub, its righthand end being pushed over a pin 21. For the lefthand and center bar, the pins are placed on the cross-pieces 6 whereas the support pin for the righthand bar is on a lug 22 on the frame.
- the de-energized tap changer is assembled for linear connection, but it can easily be converted for use with zig-zag connections.
- the transformer control winding is divided into two parts and the connections from the two parts are connected alternately to the pins 3.
- Two adjacent pins or stationary contacts are then permanently connected together by the movable contact 10. With this connection no busbar is necessary and the terminal pin may be replaced by a pin 3 if necessary.
- the two contact pieces 12 are turned upside down so that the long contact surface 18 abuts the stationary contacts.
- the short contact The de-energized tap changer is assembled as follows:
- Theslide together with its three movable contacts, is placed over the grooves in the frame with the recesses above the guide-bosses 24. In this position the slide can be placed in the grooves. The slide is then moved to one side, to the right in the embodiment shown in FIG. 1, so that the recesses 29 are opposite the position of the toothed wheel. The toothed wheel is then positioned with its teeth engaging the recesses. The shaft 27 which transfers the driving movement to the toothed wheel is inserted and locked in position so that the toothed wheel cannot be moved from its plane.
- said mounting means comprising cross-bars (6) forming a part of the frame and extending transversely to the direction of movement of the slide and having grooves (23) therein for mounting the movable slide (9), and a carrier member forming a part of the frame and supported by the cross-bars at a distance from the terminal bar and supporting the drive means for the slide.
- each cross-bar (6) is'provided with a guide boss (24) projecting slightly over the groove (23) for the 24 which protrudes slightly across the groove. This can be seen best in FIG. 4.
- the slide is thus normally locked in the grooves. So that the slide can be put in position in the grooves, it is provided with two recesses 25, the distance between these being equal to the distance between the guide bosses 24.
- the slide When the slide is placed over the grooves 23 with the recesses 25 opposite the guide bosses24, the slide can be moved into place in the groove, but as soon as the slide is then moved in one direction or the other, it becomes locked in position by the bosses.
- the recesses 25 are so positioned that they cannot be located opposite a guide boss during the nor- 'mal operating movements of the tap changer.
- guide boss 24 may be at the side of the groove as shown in FIG. 1 orit maybe placed differently, for example above the groove.
- the movement of the slide is effected with the help of a toothed wheel 26.
- The, wheel is driven with the help of some known device, not shown here.
- the toothed wheel is non-rotatably joined to a shaft 27 passing through a lug 28 at one end of the carrier member 5.
- the carrier arm is preferably provided with a journalling lug at each end so that the toothed wheel can be positioned either to the right or the left depending on the position of the tap changer in the transformer.
- the toothed wheel cooperates with recesses 29 on the side of the slide facing the toothed wheel.
- the recesses 29 terminate a little way from the upper and lower surfaces of the slide. This means that when the slide is in position in its grooves 23 and the toothed wheel is placed with its teeth in the recesses of the slide; the wheel cannot be moved in the direction of the axis of shaft 27.
- the slide and the slide is provided with-recesses (25) corresponding'to the guide bosses so that the slide can be placed in the groove when the recesses are opposite the guide bosses and that, after longitudinal displacement, it is held in the groove by the guide bosses.
- the drive means for the slide (9) comprises a toothed wheel (26) journalled in the carrier member '(5), said slide having recesses (29) therein, said wheel engaging in said recesses.
- the movable contacts (10) are composed of-two similar contact plates 12) having the shape of a parallel-trapezium, with contact surfaces (17,18) at the parallel edges, one contact surface (17) being shorter than the free distance between adjacent stationary contacts (3) on the terminal plate while the other contact surface (18) is at least as long as the distance between the centers of two adjacent stationary contacts.
- a de-energized tap changer in which the frame is provided with a bus bar (19) for each phase arranged parallel with and at a distance from the terminal bar, and said movable contacts (10) on the slide are reversible and assymme'trical, each contact in each of its positions effecting electrical contact between a single stationary contact and said bus bar and in another position effecting connection pairs of lugs 11)
Landscapes
- Breakers (AREA)
- Connector Housings Or Holding Contact Members (AREA)
- Switch Cases, Indication, And Locking (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE08402/72A SE364139B (de) | 1972-06-27 | 1972-06-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3824355A true US3824355A (en) | 1974-07-16 |
Family
ID=20273976
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00367098A Expired - Lifetime US3824355A (en) | 1972-06-27 | 1973-06-05 | De-energized tap changer for transformers with polyphase sliding contact assembly |
Country Status (8)
Country | Link |
---|---|
US (1) | US3824355A (de) |
BR (1) | BR7304711D0 (de) |
CA (1) | CA967252A (de) |
DE (1) | DE2331360C3 (de) |
DK (1) | DK134834B (de) |
IT (1) | IT986592B (de) |
SE (1) | SE364139B (de) |
ZA (1) | ZA734329B (de) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4423297A (en) * | 1981-05-30 | 1983-12-27 | Leopold Kostal Gmbh & Co. Kg | Steering column switch with flasher switch |
US4504811A (en) * | 1982-11-12 | 1985-03-12 | Westinghouse Electric Corp. | Cable operated tap changer for a three-phase transformer |
US4514602A (en) * | 1982-12-27 | 1985-04-30 | Owen D W | Switching apparatus |
US4562316A (en) * | 1984-06-07 | 1985-12-31 | Asea Electric, Inc. | High voltage linear tap changer |
US4644112A (en) * | 1986-01-03 | 1987-02-17 | Asea Electric, Inc. | Linear transformer switch |
US5744764A (en) * | 1996-09-26 | 1998-04-28 | General Signal Corporation | Modular de-energized switch for transformer tap changing |
DE19847745C1 (de) * | 1998-10-16 | 2000-01-05 | Reinhausen Maschf Scheubeck | Stufenschalter |
US20050116799A1 (en) * | 2002-03-25 | 2005-06-02 | Vetco Aibel As | Switching device |
EP2180486A1 (de) * | 2008-10-27 | 2010-04-28 | Abb Research Ltd. | Schaltvorrichtung und damit ausgerüstete Schaltanlage |
US20150028978A1 (en) * | 2012-04-20 | 2015-01-29 | Alfred Bieringer | Distribution transformer for voltage regulation of local distribution networks |
KR20160088570A (ko) | 2015-01-16 | 2016-07-26 | Koc 전기 주식회사 | 배전용 30kv 방폭 변압기 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2502438A (en) * | 1945-02-08 | 1950-04-04 | Int Standard Electric Corp | Selector switch |
US2577955A (en) * | 1949-04-02 | 1951-12-11 | Hazeltine Research Inc | Tuning control mechanism |
US2717296A (en) * | 1953-09-14 | 1955-09-06 | Gen Electric | Electrical switch contacts |
DE950794C (de) * | 1942-03-17 | 1956-10-18 | Comp Generale Electricite | Geradliniger, im spannungslosen Zustand arbeitender Stufenschalter fuer ein- oder mehrphasige Transformatoren |
US3045090A (en) * | 1959-05-08 | 1962-07-17 | Mc Graw Edison Co | Tap changer movable contact |
US3192328A (en) * | 1963-02-01 | 1965-06-29 | Mc Graw Edison Co | Movable switch contact assembly with self-aligning bridging plate members |
US3639706A (en) * | 1971-03-15 | 1972-02-01 | Stackpole Carbon Co | Reciprocating switch mechanism with improved thumbwheel actuator including rack and pinion structure |
US3673364A (en) * | 1970-11-13 | 1972-06-27 | Westinghouse Electric Corp | Transformer slide switch with contact clamping means |
-
1972
- 1972-06-27 SE SE08402/72A patent/SE364139B/xx unknown
-
1973
- 1973-06-05 US US00367098A patent/US3824355A/en not_active Expired - Lifetime
- 1973-06-20 DE DE2331360A patent/DE2331360C3/de not_active Expired
- 1973-06-26 CA CA174,938A patent/CA967252A/en not_active Expired
- 1973-06-26 ZA ZA734329A patent/ZA734329B/xx unknown
- 1973-06-26 DK DK353573AA patent/DK134834B/da unknown
- 1973-06-26 IT IT68900/73A patent/IT986592B/it active
- 1973-06-26 BR BR4711/73A patent/BR7304711D0/pt unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE950794C (de) * | 1942-03-17 | 1956-10-18 | Comp Generale Electricite | Geradliniger, im spannungslosen Zustand arbeitender Stufenschalter fuer ein- oder mehrphasige Transformatoren |
US2502438A (en) * | 1945-02-08 | 1950-04-04 | Int Standard Electric Corp | Selector switch |
US2577955A (en) * | 1949-04-02 | 1951-12-11 | Hazeltine Research Inc | Tuning control mechanism |
US2717296A (en) * | 1953-09-14 | 1955-09-06 | Gen Electric | Electrical switch contacts |
US3045090A (en) * | 1959-05-08 | 1962-07-17 | Mc Graw Edison Co | Tap changer movable contact |
US3192328A (en) * | 1963-02-01 | 1965-06-29 | Mc Graw Edison Co | Movable switch contact assembly with self-aligning bridging plate members |
US3673364A (en) * | 1970-11-13 | 1972-06-27 | Westinghouse Electric Corp | Transformer slide switch with contact clamping means |
US3639706A (en) * | 1971-03-15 | 1972-02-01 | Stackpole Carbon Co | Reciprocating switch mechanism with improved thumbwheel actuator including rack and pinion structure |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4423297A (en) * | 1981-05-30 | 1983-12-27 | Leopold Kostal Gmbh & Co. Kg | Steering column switch with flasher switch |
US4504811A (en) * | 1982-11-12 | 1985-03-12 | Westinghouse Electric Corp. | Cable operated tap changer for a three-phase transformer |
US4514602A (en) * | 1982-12-27 | 1985-04-30 | Owen D W | Switching apparatus |
US4562316A (en) * | 1984-06-07 | 1985-12-31 | Asea Electric, Inc. | High voltage linear tap changer |
US4644112A (en) * | 1986-01-03 | 1987-02-17 | Asea Electric, Inc. | Linear transformer switch |
US5744764A (en) * | 1996-09-26 | 1998-04-28 | General Signal Corporation | Modular de-energized switch for transformer tap changing |
DE19847745C1 (de) * | 1998-10-16 | 2000-01-05 | Reinhausen Maschf Scheubeck | Stufenschalter |
US7326865B2 (en) * | 2002-03-25 | 2008-02-05 | Vetco Gray Scandinavia As | Switching device |
US20050116799A1 (en) * | 2002-03-25 | 2005-06-02 | Vetco Aibel As | Switching device |
EP2180486A1 (de) * | 2008-10-27 | 2010-04-28 | Abb Research Ltd. | Schaltvorrichtung und damit ausgerüstete Schaltanlage |
WO2010049307A1 (en) * | 2008-10-27 | 2010-05-06 | Abb Research Ltd | A switch device and a switchgear provided therewith |
US20110226528A1 (en) * | 2008-10-27 | 2011-09-22 | Thor Endre | Switch Device And A Switchgear Provided Therewith |
US8969748B2 (en) | 2008-10-27 | 2015-03-03 | Abb Research Ltd. | Switch device and a switchgear provided therewith |
US20150028978A1 (en) * | 2012-04-20 | 2015-01-29 | Alfred Bieringer | Distribution transformer for voltage regulation of local distribution networks |
US9406434B2 (en) * | 2012-04-20 | 2016-08-02 | Maschinenfabrik Reinhausen Gmbh | Distribution transformer for voltage regulation of local distribution networks |
KR20160088570A (ko) | 2015-01-16 | 2016-07-26 | Koc 전기 주식회사 | 배전용 30kv 방폭 변압기 |
Also Published As
Publication number | Publication date |
---|---|
AU5724173A (en) | 1975-01-09 |
ZA734329B (en) | 1974-05-29 |
DK134834C (de) | 1977-06-27 |
CA967252A (en) | 1975-05-06 |
DE2331360B2 (de) | 1977-07-14 |
DE2331360A1 (de) | 1974-01-03 |
IT986592B (it) | 1975-01-30 |
BR7304711D0 (pt) | 1974-08-22 |
DE2331360C3 (de) | 1978-03-23 |
SE364139B (de) | 1974-02-11 |
DK134834B (da) | 1977-01-24 |
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