Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1976-12-28
1978-06-20
Miller, J. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 18, H02H 308
Patent
active
040965406
ABSTRACT:
A protective relay circuit operating in conjunction with a regulated direct-current power supply in which a rectified A-C voltage having a ripple component is fed to an output terminal coupled to a load through the choke of a filter network. The excitation coil of a relay is connected between the input of the choke and the output terminal whereas the normally-closed relay switching contacts are interposed between the output of the choke and the output terminal. The relay coil has a high impedance relative to that of the chokes so that in normal operation, the coil has virtually no influence on the filter and does not pass the ripple component to the output terminal. In the event of a short effectively grounding the output terminal, the unfiltered rectified voltage is then imposed across the excitation coil to activate the relay and open the switching contacts, thereby disconnecting the supply from the shorting load. When the short is lifted and the current then produced by the load is insufficient to sustain the relay, the relay is automatically de-activated to restore the supply voltage.
REFERENCES:
patent: 1551297 (1925-08-01), Fortescue
patent: 2873419 (1959-02-01), Brandt
patent: 3364392 (1968-01-01), Lafreniere
patent: 3409803 (1968-11-01), DeWitt, Jr.
patent: 4015171 (1977-03-01), Miller
Ebert Michael
Entron, Inc.
Miller J. D.
Salce Patrick R.
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