Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1991-11-14
1993-12-14
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 44, 361 93, H02H 328
Patent
active
052708977
ABSTRACT:
A personnel protection system for electrical connections is disclosed, which is of the type that differentially senses the current flow between the power lead and the return lead (or between two power loads) is provided with an unbalancing impedance which makes the current difference between the two leads sufficiently high to trip the device and cause the power to be disconnected. A utilization device is similarly provided with an imbalanced impedance. However, that impedance is calculated to counteract the current imbalance caused by the first impedance, so that when the cable is connected to the utilization device, the current balance between the two conductors is restored, and power connection is maintained in the cable. In addition, the current flow in the second impedance is sensed and, if it is not at the correct level, electrical power to the load is disconnected in the same manner as when an imbalance occurs. Thus, the system does not provide continuous power unless predetermined conditions considered safe for securing the power are fully satisfied.
REFERENCES:
patent: 3886409 (1975-05-01), Scarpino
patent: 4138707 (1979-02-01), Gross
McDonald Thomas M.
Smith-Vaniz W. Reid
'Hubbell Incorporated
Jackson S.
Lerch Joseph B.
Pellinen A. D.
Presson Jerry M.
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