Method of monitoring the contact burnoff in tap changers
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United States of America Patent
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Feb 11, 2003
Grant Date -
Aug 16, 2001
app pub date -
Jan 29, 2001
filing date -
Jan 29, 2000
priority date (Note) -
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Abstract
A method of monitoring contact burnoff in tap changers operating under load in which the load current is measured and for nominal variation of the voltage of the particular tap parameters are stored which are used to calculate the burnoff rate per contact per switching operation. From these values the cumulative burnoff rate of both the switching contact and resistance contact are determined and compared with limits or threshold values.
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