Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1993-10-18
1995-08-08
Dougherty, Thomas M.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
H02H 300
Patent
active
054404410
ABSTRACT:
A NO-BLO-FUSE comprising a current sensing device is used to generate a voltage drop proportional to the current flowing through the device. When the voltage drop reaches a predetermined level, resulting from an over-current condition, it trips a control means that opens a solid state switch in the line. After a defined delay interval the circuit will automatically reset to close the solid state switch. If the over-current condition still exists, the control means will again open the solid state switch. This cycle is repeated at the delay interval until the over-current condition has subsided. Circuits are also disclosed which provide over-voltage protection, through detectors which trigger the control means when an over-voltage condition is detected. The application of the invention to lightning or surge protection is also disclosed, for single line and multi-line environments. Furthermore, disclosed is a micro computer based power line protection, monitoring and management system that manages one or more source(s) and one or more user(s) of the power.
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patent: 4544983 (1985-10-01), Anderson et al.
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Dougherty Thomas M.
To E.
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