High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Operating mechanism structure or arrangement
Patent
1995-01-27
1996-10-08
Brown, Brian W.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Operating mechanism structure or arrangement
218140, 337130, 337139, H01H 3342, H01H 7704, H01H 8102
Patent
active
055633900
ABSTRACT:
The present invention relates to an actuating mechanism for actuating the moving contact of a protective interrupting chamber which is installed on a high-voltage or medium-voltage power line and which is to be opened when a current in excess of a surge current threshold flows through line, the mechanism including a drive member for driving a displacement device for displacing the contact. The drive member is a conductive helical spring made of a shape memory alloy and electrically coupled to the line, a current in excess of said surge current threshold passing through the spring heating said spring to such an extent that said alloy goes from its martensitic phase to its austenitic phase. The mechanism enables the interrupting chamber to be re-closed by means of a sequencer device associated with the displacement device, and providing an adjustable and timed opening and closing cycle.
REFERENCES:
patent: 4371791 (1983-02-01), Mercier
patent: 4570143 (1986-02-01), Bridges et al.
patent: 4713643 (1987-12-01), Baum et al.
patent: 4865521 (1989-09-01), Ise et al.
patent: 4973931 (1990-11-01), Herbert
Brown Brian W.
Friedhofer Michael A.
GEC Alsthom T & D Inc.
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