Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1977-01-26
1978-03-21
Miller, J D
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 87, H02H 316
Patent
active
040806421
ABSTRACT:
An electrical power system safety monitor for monitoring the continuity of an electrical power distribution system and including signal generators for generating a monitoring signal and a simulated fault signal; an impedance bridge; a three-phase coupler connected between the impedance bridge and the system's three-phase electrical conductors for impedance coupling the bridge to the conductors; a second three-phase coupler connected between the three-phase electrical conductors and the ground connector for impedance coupling the three-phase electrical conductors to the ground conductor; a reactor in series with the ground conductor for impedance isolating the ground conductor; and a signal comparator for developing a control signal whenever the relationship between the simulated fault signal and the monitoring signal indicates the occurrence of an electrical fault in the system.
REFERENCES:
patent: 3728582 (1973-04-01), Agnew
patent: 3995200 (1976-11-01), Stolarczyk
Miller J D
Salce Patrick R.
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