Solid state overload relay

Details Solid state overload relay Solid state overload relay

1997-07-10

1998-10-06

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 56, 361 94, 361115, H02H 300

Patent

active

058186743

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 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 switch for actuating the switch during at least one predetermined condition of the current signals. The fault determining circuit has digital pulse extender circuitry for converting the current signals into DC signals, and a digital timer for delaying actuation of the switch.

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