Method and apparatus for detecting faults in AC to AC, or DC...

Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of ground fault indication

Reexamination Certificate

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C324S510000, C363S095000

Reexamination Certificate

active

07154277

ABSTRACT:
A system for use in ac to ac or dc to ac power conversion equipment to detect faults in an inverter when the inverter is in a high impedance mode. The system detects ground faults or cross wiring conditions by converting the inverter outputs to digital signals and evaluating the frequencies of the resulting signals. The system keeps the inverter in the high impedance mode until after it has been determined that neither of the described abnormal statuses exist. The system tests for both of the abnormal statuses on power up and thereafter tests only for a ground fault whenever the inverter switches are disabled.

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patent: 5483167 (1996-01-01), Mikami
patent: 6330140 (2001-12-01), Wilson-Jones et al.
patent: 6381110 (2002-04-01), Nagashima et al.
patent: 2003/0067303 (2003-04-01), Huber et al.

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