Solid state overload relay

Details Solid state overload relay Solid state overload relay

1997-07-10

1999-11-16

Jackson, Stephen W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361100, 361115, H02H 300

Patent

active

059868660

ABSTRACT:
A self-powered multiple phase circuit protection device including a plurality of current transformers connected in parallel with each other and associated with one phase of a multiple phase load for providing signals representative of the current flowing in an associated phase. A first switch can be actuated to interrupt power to the multiple phase load, and a fault determining circuit is connected to the circuit transformers and to the first switch for actuating the switch during at least one predetermined condition of the current signals. A second switch can be automatically actuated to reconnect power to the multiple phase load. The fault determining circuit has a timer for delaying the actuation of the first switch, and a warning signal can be issued prior to actuation of the first switch so that the user can take corrective action.

REFERENCES:
patent: 4876622 (1989-10-01), Dougherty
patent: 5179495 (1993-01-01), Zuzuly
patent: 5388022 (1995-02-01), Ahuja
patent: 5457591 (1995-10-01), Mock et al.
International Search Report PCT/US 98/14038, Nov. 2, 1998.
International Search Report PCT/US 98/14038 (Should be PCT/US 98/14039), Nov. 2, 1998.

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