Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1997-06-30
1999-09-28
Gaffin, Jeffrey
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361102, H02H 300
Patent
active
059598182
ABSTRACT:
A method and apparatus is disclosed for three phase sensing of a polyphase distribution system to provide true RMS signal monitoring capabilities. Each current transformer is provided with a rectifier and a separate burden to not only provide accurate signal representation of the true RMS currents in each phase, but also provide a DC voltage supply to thereby self-power the circuit. Two configurations are disclosed, one in which two CTs sense all three phases. In this configuration, two phases of the three phase system are used as a single primary winding in each current transformer such that each current transformer produces a voltage representation of a sum of two phase currents. A second configuration discloses the use of a current transformer for each phase. In both embodiments, by providing a separate burden and rectifier for each CT, true RMS signal characteristics can be extracted from the produced discrete signals, while at the same time providing a DC voltage supply for self-powering the circuit.
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Eaton Corporation
Gaffin Jeffrey
Sherry Michael J.
Ziolkowski Timothy J.
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