Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1977-07-21
1979-02-06
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 44, 361 87, H02H 328
Patent
active
041387074
ABSTRACT:
Ground fault protective systems are disclosed in which fault signals are generated in response to differential currents carried by electrical supply lines. A circuit breaker interrupts power on the supply lines when the fault signals exceed a given magnitude and duration. Downstream reactances to ground from one or more supply lines give rise to spurious fault signals which do not characterize true ground fault conditions. These spurious fault signals are cancelled prior to detection by means of neutralizing auxiliary circuits. The resulting fault signals exhibit a high signal-to-noise ratio.
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Roberson William D.
Salce Patrick R.
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