Electricity: circuit makers and breakers – Multiple circuit control – Operating means
Patent
1997-03-25
1998-11-10
Gellner, Michael L.
Electricity: circuit makers and breakers
Multiple circuit control
Operating means
200 11TC, 200 18, 200400, H01H 300, H01H 1958, H01H 5500
Patent
active
058347178
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is the U.S. national phase of PCT application PCT/EP96/00400 filed 31 Jan., 1996 with a claim to the priority of German application 195 10 809.4 filed 24 Mar., 1995.
FIELD OF THE INVENTION
The present invention relates to an on-load tap changer of a step switch.
BACKGROUND OF THE INVENTION
An on-load tap changer of a step switch has a force-storage unit which has a charging slide continuously movable by a bidirectionally rotatable drive shaft and an output part that when tripped suddenly follows the movement of the charging slide. A switching shaft is rotatable by the tripped output part and a switching system is provided for each phase that is actuatable by actuating elements that coact with edges of concentric cams rotated by the switching shaft.
Such tap changers are known from German patent publication 4,231,353. Per phase therein two vacuum switching tubes, subsequently referred to as VAC's, are provided; the actuation of these VAC's and of mechanical switching contacts takes place by means of a bidirectionally rotatable switching shaft that after tripping a force-storage unit is rotated rapidly. In this system for actuating the VAC's the switching shaft carries a cam disk which has on its edge for each VAC a cam formation on which a roller rides that works on the actuating lever of the respective VAC. The reversing of the mechanical contacts is also effected by a switching segment also rotated by the drive shaft and switching between fixed contacts arranged on the periphery of the on-load tap changer. With this tap changer the cam disks for the actuation of the two VAC's as well as the switching segment for actuating mechanical contacts are moved from one end position into the other and then again back independent of the actual movement direction of the step selector; this means that the contacts which have to be closed first on movement out, that is during rotation of the switching shaft in one direction, must on return movement, that is rotation of the switching shaft in the other direction, be first opened and vice versa.
Such a known tap changer is thus not suitable for making an asymmetrical switching circuit where independent of the switching direction the same contacts are always electrically switched or mechanically moved first. Such an asymmetrical switching circuit is for example described in the unpublished German patent document 4,407,945 as well as in a different form with double-pole switching specially for on-load tap changers in the also not published German patent document 4,441,082.
FIG. 4 shows the last-mentioned asymmetrical switching circuit with double-pole reversing wherein independent of the switching direction the same actuating sequence, that is succession, of moving or to be actuated switch means is described.
In WO 89/08924 there is described specially for thyristor circuits a particular spring snap drive which independent of its drive direction always is loaded in one direction, that is has only one output direction. This is one possibility of making in principle an asymmetrical switching circuit; the described spring-loaded force-storage unit is nonetheless of complex construction, requires a lot of space for a number of essential latching and coupling elements, and is also not suitable for the combined actuation of VAC's as electrical switching elements on the one side and mechanical contacts on the other side in a predetermined actuating sequence.
OBJECTS OF THE INVENTION
It is an object of the invention to provide an on-load tap changer of the above-described type that permits in a simple manner with a bidirectionally drivable switching shaft the formation of an asymmetrical switching circuit such that independent on the rotation direction the same actuating sequence of VAC's and of mechanical switching elements is achieved.
SUMMARY OF THE INVENTION
An on-load tap changer of a step switch according to the invention has a force-storage unit which has a charging slide continuously movable by a bidirec
REFERENCES:
patent: 3798395 (1974-03-01), Norman et al.
patent: 4595806 (1986-06-01), Itoh
Neumeyer Josef
Pillmeier Leonhard
Dubno Herbert
Gellner Michael L.
Hayes Michael I.
Maschinenfabrik Reinhausen GmbH
Wilford Andrew
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