Harmonic measuring instrument for AC power systems with a time-based threshold means
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United States of America Patent
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Apr 5, 1994
Grant Date -
N/A
app pub date -
Aug 21, 1992
filing date -
Aug 21, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An instrument for measuring voltage harmonics and current harmonics on AC (alternating current) power systems. The instrument includes the ability to determine when threshold limits have been exceeded for harmonics. The instrument also includes timing thresholds whose inputs are activated when the harmonic thresholds are exceeded. A single harmonic threshold is applied to measurements from multiple phases on poly-phase systems by comparing the square rot of the sum of the squares of measurements from each phase to the harmonic threshold. Three indicators show when voltage harmonic limits are exceeded, current harmonics limits are exceeded, or both voltage and current harmonic limits are exceeded simultaneously.
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