Step switch

Details Step switch Step switch

1994-09-27

1996-06-04

Scott, J. R.

Electricity: power supply or regulation systems

External or operator controlled

Using a transformer or inductor as the final control device

200 11TC, 336150, 323341, H01F 2904

Patent

active

055236740

DESCRIPTION:

BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is the U.S. national phase of PCT application PCT/EP93/01112 filed 6 May 1993 with a claim to the priority of German patent applications P 42 23 439.5 filed 16 Jul. 1992, P 42 37 231.3 filed 4 Nov. 1992, and P 42 32 165 also filed 4 Nov. 1992 (and all now issued as German patents).


FIELD OF THE INVENTION

The invention relates to a step switch for step transformers with two movable selector contacts.


BACKGROUND OF THE INVENTION

In such a known step switch as described in German patent document 2,321,369 there are two selector arms each carrying a respective selector contact, the first of the movable selector contacts being connected to a vacuum switch intended for continuous-current transmission and interruption and the second of the movable selector contacts being connected to a vacuum switch and series-connected shunt resistor intended only for conducting and interrupting the compensating current. The two movable selector contacts are connected to each other and to the vacuum switch so that when the switching direction changes the rotation direction of the drive also changes and during each indexing of the second selector contact the vacuum switch that is intended only to conduct and interrupt the compensating current in series with the shunt resistor is left connected momentarily all alone to the tap at high voltage. With this known step switch according to the switching direction the resistance contact either leads or trails; the switching procedure is different depending on switching direction.
As a result both of the arms carrying the respective selector contacts must be jointly actuated by the energy-storage unit; this is particularly disadvantage due to the complex kinematics as well as the mechanically costly energy-storage unit which is required in particular by the different switching steps depending on switching direction.


OBJECT OF THE INVENTION

It is therefore an object of the invention to provide a step switch whose kinematics are very simple and which requires for actuating the switching means an energy-storage unit that is uncomplicated and that works the same in both directions with the same switching steps.


SUMMARY OF THE INVENTION

A step switch is used with a step transformer having a row of contacts including at least a first contact and an adjacent second contact. The step switch has a threaded drive shaft extending along the row of transformer contacts, a support movable relative to the drive shaft along the row of transformer contacts and threaded on the drive shaft, and a fixed contact fixed on the support and movable therewith along the row of transformer contacts to successively engage same. A buss conductor extending longitudinally along the row of transformer contacts is connected via a vacuum switch to the fixed contact. The shaft is rotated in one sense to slowly displace the support in one direction along the row for displacement of the fixed contact from the first contact to the second contact and in the opposite direction along the row for displacement of the fixed contact slowly in the opposite direction from the second contact to the first contact. A slide movable relative to the drive shaft and to the support carries a movable contact and a switch and a resistor are connected between the movable contact and the buss conductor. A spring-loaded force-storage unit is braced between the slide and the support for, on movement of the fixed contact from the first contact to the second contact, rapidly displacing the movable contact from the first contact to the second contact once the fixed contact is moved fully to the second contact and on opposite movement of the support by the shaft for, on movement of the fixed contact from the second contact to the first contact, rapidly displacing the movable contact from the second contact to the first contact once the fixed contact is moved to the first contact.
It is a particular advantage of the step switch according to the invention that--independent of the switchi

REFERENCES:
patent: 3571543 (1971-03-01), Perkins et al.
patent: 3579092 (1971-05-01), Matzl
patent: 3590175 (1971-06-01), Bleibtreu et al.
patent: 3614597 (1971-10-01), Van Riemsdijk
patent: 3628128 (1971-12-01), Buhler
patent: 3643154 (1972-02-01), Van Riemsdijk
patent: 3935407 (1976-01-01), Bleibtreu et al.
patent: 4081741 (1978-03-01), Palmer
patent: 4931599 (1990-06-01), Bleibtreu
patent: 4978815 (1990-12-01), Berger et al.
patent: 5107200 (1992-04-01), Dohnal et al.

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