Electricity: circuit makers and breakers – Multiple circuit control – Pivoted contact
Patent
1996-09-25
1998-07-28
Dang, Khanh
Electricity: circuit makers and breakers
Multiple circuit control
Pivoted contact
323340, 323341, H01F 2904
Patent
active
057865523
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is the US national phase of PCT application PCT/EP95/00855 filed 8 Mar. 1995 with a claim to the priorities of German patent application P 44 07 945.1 filed 9 Mar. 1994 and P 44 41 082.4 filed 18 Nov. 1994.
1. Field of the Invention
The invention relates to a switchover arrangement for load switches of tap changers and for load selectors. Such a switchover arrangement is known from German published application 2,520,670.
2. Background of the Invention
The known switchover arrangement of the German document has at least two bidirectionally movable switch contacts serving to switch a load output line from one to another tap contact, one switch contact serving as a main switch contact and the other as a switch contact resistance, with both resting in stationary condition on the same tap contact. The movable switch contacts are thus fixedly coupled together and mounted on a common contact carrier and are also jointly actuated by movement of the common contact carrier. Independent of the switching direction one contact always leads and the other follows.
Each of the movable switch contacts is in series with a mechanical series contact and the two series contacts are simultaneously and individually connectable with the load output line. This selectable connection is effected by a movable mechanical interrupting or switchover contact. In addition, with this known arrangement a force-storage unit is provided that, when tripped, actuates not only the two movable mechanically interconnected switch contacts as well as the interrupter contact.
These known switchover arrangements have several disadvantages. First, they always require a mechanical interrupter contact. Vacuum switching tubes, which are known for their fire-resistance and the resultant avoidance of fouling of the surrounding environment as well as for the large number of switch operations possible, cannot be used for the known switchover apparatus. In addition the switch contacts reverse their mechanical functions depending on switching direction from leading to trailing; the switch cycle changes with the switching direction. Both switch contacts must therefore be actuated jointly by the force-storage unit and in addition the force-storage unit must as described actuate the movable interrupter contact which forms the current connection to the load output line so that the result is, in general, a complicated mechanism and requires a correspondingly mechanically expensive force-storage unit.
OBJECT OF THE INVENTION
It is an object of the invention to provide a switchover arrangement of the above-described type that is usable for load switches and also for load selectors, which permits the use of vacuum switch tubes in the main and in the resistance branch, and which has a kinematically simple mechanism and thus an uncomplicated force-storage unit working in both directions and only making an always identical switch step for actuating the least possible switchover means.
SUMMARY OF THE INVENTION
This object is achieved by a switchover arrangement for load switches of tap changers and for load selectors with at least two fixed tap contacts and with two bidirectionally movable switch contacts switching a load output line from one fixed stepped contact to another fixed tap contact. The switching of the switch contacts is triggered by the springlike release of a force-storage unit. One of the switch contacts is formed as a main switch contact connected directly with the load output line, while the other switch contact is connectable as a resistance switch contact in series with a switchover resistor to the load output line. The switch contact connectable as main switch with the load output line reaches the new fixed tap contact before the switch contact connectable as resistance switch contact with the load line leaves the previous fixed tap contact. According to the invention, both switch contacts being movable independently of each other without mechanical coupling or interconnection. One of the s
Dohnal Dieter
Lessmann-Mieske Hans-Henning
Neumeyer Josef
Pillmeier Leonhard
Dang Khanh
Dubno Herbert
Maschinenfabrik Reinhausen GmbH
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