Personnel protection system for electrical power connections
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United States of America Patent
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Dec 14, 1993
Grant Date -
N/A
app pub date -
Nov 14, 1991
filing date -
Nov 14, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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Family
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Cited Art Landscape
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