Alternating current series arc fault detection method

Details Alternating current series arc fault detection method Alternating current series arc fault detection method

2007-10-22

2009-12-15

Leja, Ronald W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

Reexamination Certificate

active

07633729

ABSTRACT:
A method of detecting and indicating a presence of alternating current (AC) series arc fault events in current supplied by an AC electrical power source to an electrical load for the power source comprises the steps of: measuring positive and negative current through the load over a first sample cycle of the AC power to establish first measured positive and first measured negative current levels; determining the absolute value of the first measured positive and first measured negative current levels to establish a first absolute positive current level and a first absolute negative current level; adding the first absolute positive current level and the first absolute negative current level to establish a first sum current level; measuring positive and negative current through the load over a second sample cycle staggered from the first sample cycle to establish second measured positive and second measured negative current levels; determining the absolute value of the second measured positive and second measured negative current levels to establish a second absolute positive current level and a second absolute negative current level; adding the second absolute positive current level and the second absolute negative current level to establish a second sum current level; subtracting the second sum current level from the first sum current level to establish a current difference level; and indicating a series arc fault event if the current difference level exceeds a predetermined threshold level.

REFERENCES:
patent: 5561605 (1996-10-01), Zuercher et al.
patent: 5839092 (1998-11-01), Erger et al.
patent: 6577138 (2003-06-01), Zuercher et al.
patent: 7359168 (2008-04-01), Elms et al.
patent: 2007/0133134 (2007-06-01), Kilroy et al.

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