Electrical transmission or interconnection systems – Switching systems – With operation facilitating feature
Reexamination Certificate
2004-12-23
2008-08-05
Sherry, Michael J (Department: 2836)
Electrical transmission or interconnection systems
Switching systems
With operation facilitating feature
C307S081000, C200S0110TC, C200S019030, C200S019110, C200S0380DB, C200S0380FB
Reexamination Certificate
active
07408275
ABSTRACT:
Automatically changing the tap position in a load tap changer includes noting a polarity of a first tap position of a load tap changer. A duration for which one or more consecutive tap positions of the load tap changer collectively have had the noted polarity also is noted. The one or more consecutive tap positions include the first tap position. The duration for which the one or more consecutive tap positions collectively have had the noted polarity is compared to a threshold value. A change is made from the first tap position to a second tap position with a polarity that is different than the noted polarity when the duration for which the one or more consecutive tap positions collectively have had the noted polarity is longer than the threshold value. A change may be made from the second tap position back to the first tap position.
REFERENCES:
patent: 3427530 (1969-02-01), Hartwell et al.
patent: 3544884 (1970-12-01), Prescott
patent: 4530607 (1985-07-01), Bungener
patent: 5179290 (1993-01-01), Page
patent: 5450002 (1995-09-01), Dunk
patent: 5581173 (1996-12-01), Yalla et al.
patent: 6100674 (2000-08-01), Dohnal et al.
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patent: 6833518 (2004-12-01), Byers et al.
patent: WO 02/48730 (2002-06-01), None
PCT International Search Report (Application No. PCT/US05/46759) mailed Oct. 2, 2007 (2 total pages).
PCT Written Opinion (Application No. PCT/US05/46759) mailed Oct. 2, 2007 (8 total pages).
Down Donald A.
Hernandez, Jr., legal representative Augusto D.
Kaluzny Richard J.
Rapant Fred J.
Cooper Technologies Company
Fish & Richardson P.C.
Kaplan Hal I
Sherry Michael J
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