Clock synchronization for line differential protection
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United States of America Patent
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Apr 4, 2017
Grant Date -
Feb 6, 2014
app pub date -
Jul 24, 2013
filing date -
Jul 31, 2012
priority date (Note) -
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Abstract
A method and arrangement are provided for time synchronization between two geographically separated stationary clocks, such as first and second clocks located respectively at first and second ends of an AC power line. A first representation of an oscillating power line quantity is produced by measuring or recording the power line quantity at the first end of the power line, and time-stamping the first representation by the first clock. A second representation of the same oscillating power line quantity is produced by measuring the power line quantity at the second end of the power line, and time-stamping the second representation by the second clock. The first and second representations are compared to determine a clock offset between the first and second clocks. Based on the comparison, one or both of the first and second clocks are adjusted to reduce the determined clock offset.
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