Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Reexamination Certificate
2007-10-12
2011-10-25
Barnie, Rexford (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
Reexamination Certificate
active
08045307
ABSTRACT:
A method of identifying fault conditions in a three phase power system includes monitoring the changes of both the current and voltage properties on a three phase power network. A maximum phase change value of both the current and voltage is determined. Either the voltage or the current values are selected, whichever includes the largest maximum phase change. Thereafter, the selected set of measurements is analyzed to determine whether a fault condition exists on any phase of the three phase power.
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ABB Technology AG
Barnie Rexford
Clark Christopher
Prewitt Michael C.
Szczepanik Melissa J.
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