초록 ▼

A system and method for providing an uninterrupted supply of power to a critical load includes at least two uninterruptible power supply UPS modules that receive power from separate utility sources. A controller controls the UPS modules so that the output power from one UPS module is substantially i

A system and method for providing an uninterrupted supply of power to a critical load includes at least two uninterruptible power supply UPS modules that receive power from separate utility sources. A controller controls the UPS modules so that the output power from one UPS module is substantially in-phase with the output power from the other UPS module. As a result, the output powers from the UPS modules can be combined with one another to provide a sufficient source of uninterruptible power to the critical load regardless of the phase difference in the power provided by the separate utility sources.

대표청구항 ▼

[ What is claimed is:] [1.] A system for providing an uninterruptible supply of power to a critical load comprising:a first secondary main switchboard electrically coupled to a first utility source via a first main breaker, said first main breaker normally closed;a second secondary main switchboard

[ What is claimed is:] [1.] A system for providing an uninterruptible supply of power to a critical load comprising:a first secondary main switchboard electrically coupled to a first utility source via a first main breaker, said first main breaker normally closed;a second secondary main switchboard electrically coupled to a second utility source via a second main breaker, said second main breaker normally closed;a first switchboard electrically coupled to said first secondary main switchboard via a first feed and a first feed breaker and electrically coupled to said second secondary main switchboard via a first alternate feed and a first alternate feed breaker, said first feed breaker normally closed and said first alternate feed breaker normally opened;a second switchboard electrically coupled to said second secondary main switchboard via a second feed and a second feed breaker, and electrically coupled to said first secondary main switchboard via a second alternate feed and a second alternate feed breaker, said second feed breaker normally closed and said second alternate feed breaker normally opened;a first uninterruptible power supply (UPS) module electrically coupled to said first switchboard via a first UPS feed and a first UPS feed breaker, said first UPS feed breaker normally closed;a second UPS module electrically coupled to said second switchboard via a second UPS feed and a second UPS feed breaker, said second UPS feed breaker normally closed;a UPS paralleling switchgear electrically coupled to said first UPS module via a first UPS output line, and electrically coupled to said second UPS module via a second UPS output line, wherein said UPS paralleling switchgear combines power from said first UPS module with power from said second UPS module so that said first UPS module and said second UPS module equally share the critical load.