Preventive maintenance tapping and duty cycle monitor for voltage regulator
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United States of America Patent
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Mar 29, 2011
Grant Date -
Mar 5, 2009
app pub date -
Oct 23, 2008
filing date -
Sep 8, 2003
priority date (Note) -
In Force
status (Latency Note)
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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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