Electrical transmission or interconnection systems – Switching systems – Switch actuation
Patent
1998-12-21
2000-12-05
Ballato, Josie
Electrical transmission or interconnection systems
Switching systems
Switch actuation
307113, 361191, H01H 4722
Patent
active
061570982
ABSTRACT:
A feed line connecting circuit for selectively connecting first, second and third feed line connecting terminals under a predetermined current feeding condition comprises a first current detector connected between one of the first and second feed line connecting terminals and a central node for detecting a current over a predetermined value; a first switch connected between the one of the first and second feed line connecting terminals and the central node for connecting said one of the first and second feed line connecting terminals to the central node under an unpowered condition; a selective switch controlled by the first current detector, the selective switch having first and second contacts and a common contact connected to the third feed line connecting terminal, the common contact being connected to the first selective contact when the first current detector does not detect a current over the predetermined value, and to the second selective contact when the first current detector detects a current over the predetermined value; and a second current detector connected between the first selective contact of the selective switch and the central node to change the first switch so as to disconnect said one of the first and second feed line connecting terminals from the central node when detecting a current above the predetermined value.
REFERENCES:
patent: 5196984 (1993-03-01), Webb
patent: 5491368 (1996-02-01), Yamamoto
patent: 5644466 (1997-07-01), Ohta et al.
Asakawa Kenichi
Goto Koji
Kawazawa Toshio
Kojima Junichi
Nazuka Etsuo
Ballato Josie
DeBeradinis Robert L.
KDD Corporation
KDD Submarine Cable Systems Inc.
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