Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1989-04-12
1990-05-01
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 98, 307288, H02H 308
Patent
active
049223720
ABSTRACT:
Apparatus for detecting a primary fault current in a three-phase current system and converting the detected fault current in the mechanical action for breaking a circuit in which the primary fault current occurred includes a combination of transformers and diodes for receiving the three phases of current, providing corresponding phases of secondary current within a predetermined desired amperage metering range, choosing the largest magnitude secondary current and providing the largest magnitude secondary current as output, a resistor for providing voltage proportional to the largest magnitude secondary current, a capacitor for storing a peak value of the voltage which is proportional to the largest magnitude secondary current and a latching circuit for moving a trip member and providing mechanical action in response to the largest magnitude secondary current exceeding a predetermined level.
REFERENCES:
patent: 3803455 (1974-04-01), Willard
patent: 3988643 (1976-10-01), Morris
patent: 4315295 (1982-02-01), Zocholl
patent: 4368500 (1983-01-01), Conroy, Jr. et al.
Jennings Derek S.
SPD Technologies Inc.
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