Title: Control system of feedback protection for faults of three phase power supply and load
Application Number: 200610022218 Application Date: 2006.11.08
Publication Number: 1960101 Publication Date: 2007.05.09
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02H3/253;H02H7/09
Applicant(s) Name: Li Xianghuai Address:
Inventor(s) Name: Li Xianghuai;Yang Ronghe
Attorney & Agent: yanghai yan
Abstract:
    The invention solves issues to prevent load damage when three-phase power supply is lack of phases as well as to request power cut protection of three-phase power supply when malfunction occurs on load. Using transformer to obtain powerdown information of any one or more wires in three-phase four-wire power supply, the invention obtains information of lack of phases in three-phase four-wire power supply. The invention considers multiform powerdown information of any one or more wires as combined switch information. The invention carries out unitive switch control for three-phase four-wire power supply connected to loads. That is to say the power supply connected to loads includes two states: complete on or off. Determining whether three-phase power supply is in fault state: loss of phase or lack of phase, the invention makes action of disconnecting all wires in protectionability so as to prevent load on three phases power supply from damaging.
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