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1. (WO2010114513) THREE PHASE POWER SUPPLY FAULT PROTECTION

Pub. No.:    WO/2010/114513    International Application No.:    PCT/US2009/038750
Publication Date: Fri Oct 08 01:59:59 CEST 2010 International Filing Date: Tue Mar 31 01:59:59 CEST 2009
IPC: H02H 7/122
H02H 3/08
Applicants: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
ATLURI, Prasad, R.
LAWRENCE, Mark, A.
Inventors: ATLURI, Prasad, R.
LAWRENCE, Mark, A.
Title: THREE PHASE POWER SUPPLY FAULT PROTECTION
Abstract:
A fault protection circuit for use in a three phase power supply system that has a three phase ac input, and three phases, with each phase having a power supply, includes a sensor in each phase that senses a phase drop out condition in its associated phase of the three phase power supply system, a relay in each phase coupled to the 5 sensor, with the relay de-energizing upon sensing the phase drop out condition, and a relay contact coupled to the relay. The relay contact opens upon de-energizing the relay, thereby removing ac power input to one or more of the power supplies.