Electrical transmission or interconnection systems – Switching systems – With operation facilitating feature
Reexamination Certificate
2011-03-29
2011-03-29
Kaplan, Hal I (Department: 2836)
Electrical transmission or interconnection systems
Switching systems
With operation facilitating feature
C307S134000, C307S135000, C307S138000
Reexamination Certificate
active
07915766
ABSTRACT:
The life of load tap changer contacts is monitored by detecting an arcing event; identifying arcing surfaces involved in the arcing event; calculating a per-unit loss of life for the identified arcing surfaces as a result of the arcing event; updating estimates of cumulative erosion for the arcing surfaces; comparing the updated estimates of cumulative erosion to a first threshold value; and signaling for action when at least one of the updated estimates of cumulative erosion exceeds the first threshold value.
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PCT International Search Report (Application No. PCT/US04/29289) mailed Oct. 1, 2007 (2 total pages).
PCT Written Opinion (Application No. PCT/US04/29289) mailed Oct. 1, 2007 (7 total pages).
Down Donald A.
Hernandez Augusto D.
Hernandez, Jr., legal representative Augusto D.
Kaluzny Richard J.
Rapant Fred J.
Cooper Technologies Company
Fish & Richardson P.C.
Kaplan Hal I
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