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New NIST calibration service 'arms' phasors for more reliable power grids
August 20, 2007While the new calibration service for phasor measurement units (PMUs) offered by the National Institute of Standards and Technology (NIST) sounds like it would appeal to "Star Trek" fans, it's actually the operators of America's electrical power grid-and all of us who value uninterrupted current-who benefit.
The new NIST service provides calibrations for the instruments that measure the magnitude and phase of voltage and current signals in a power system-a combined mathematical entity called a phasor-and report the data in terms of Coordinated Universal Time (UTC, also known as "the official world atomic time").
Use of absolute time enables measurements called phase angles taken at one location on a power grid to be comparable to others across different systems. Phase angles and their derivations allow grid managers to know the operating condition of their portion of the system and determine if action is needed to prevent a power blackout.
The new NIST calibration service has already yielded two additional benefits. First, a major PMU manufacturer reports that using the calibrations during the manufacture of its instruments has improved their accuracy by a factor of five. Secondly, some PMUs that have been calibrated using the NIST service have revealed incompatibilities in the message format they send out, leading to corrections that have improved interoperability between PMUs across power grids.
National Institute of Standards and Technology (NIST)
The new NIST calibration service has already yielded two additional benefits. First, a major PMU manufacturer reports that using the calibrations during the manufacture of its instruments has improved their accuracy by a factor of five. Secondly, some PMUs that have been calibrated using the NIST service have revealed incompatibilities in the message format they send out, leading to corrections that have improved interoperability between PMUs across power grids.
National Institute of Standards and Technology (NIST)
Calibration Current Events and Calibration News RSSStudy shows brief training in meditation may help manage pain
Living with pain is stressful, but a surprisingly short investment of time in mental training can help you cope.
PTB Terahertz calibration satisfies US laser manufacturer
Terahertz radiation still lies in a metrological no man's land - a metrology gap. The Physikalisch-Technische Bundesanstalt (PTB) can now close this gap.
Researchers develop innovative imaging system to study sudden cardiac arrest
A research team at Vanderbilt University has developed an innovative optical system to simultaneously image electrical activity and metabolic properties in the same region of a heart, to study the complex mechanisms that lead to sudden cardiac arrest.
Concurrent imaging of metabolic and electric signals in the heart
Cardiac rhythm disorders can result from disturbances in cardiac metabolism. These metabolic changes are tightly linked with specific cardiac electrophysiology (CEP) abnormalities, such as depressed excitability, impaired intra- and extracellular conductivities, wave propagation block, and alteration of conduction velocity, action potential amplitude, and duration.
New NIST method reveals all you need to know about 'waveforms'
The National Institute of Standards and Technology (NIST) has unveiled a method for calibrating entire waveforms-graphical shapes showing how electrical signals vary over time-rather than just parts of waveforms as is current practice.
Algae and pollen grains provide evidence of remarkably warm period in Antarctica's history
For Sophie Warny, LSU assistant professor of geology and geophysics and curator at the LSU Museum of Natural Science, years of patience in analyzing Antarctic samples with low fossil recovery finally led to a scientific breakthrough.
Deep Impact and Other Spacecraft Find Clear Evidence of Water on Moon
New data from the Deep Impact spacecraft and the Moon Mineralogy Mapper (M3), an instrument aboard India's recently ended Chandrayaan-1 spacecraft, provide, for the first time, clear evidence that water exists on the surface of the Moon.
New multi-use device can shed light on oxygen intake
A fiber-optic sensor created by a team of Purdue University researchers that is capable of measuring oxygen intake rates could have broad applications ranging from plant root development to assessing the effectiveness of chemotherapy drugs.
New NIST nano-ruler sets some very small marks
The National Institute of Standards and Technology (NIST) has issued a new ruler, and even for an organization that routinely deals in superlatives, it sets some records.
NIST calculations may improve temperature measures for microfluidics
If you wanted to know if your child had a fever or be certain that the roast in the oven was thoroughly cooked, you would, of course, use a thermometer that you trusted to give accurate readings at any temperature within its range.
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