Wide area measurements (synchrophasor measurements) in Power Systems
Measurements
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Transcript of Measurements
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Measurement
A quantitative
data
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The use of MathematicsAccording to Lord Kelvin, “In
Physical Science one knows what he is talking about when he can measure and express it in numbers.” Therefore, Mathematics can be considered a language of the Physical Science.
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MeasurementsThe process of obtaining
the size or magnitude of a quantity.
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Systems of MeasurementMKS (Meter, Kilogram, Seconds)
CGS (Centimeter, Gram, Seconds)
FPS (Foot, Pound, Seconds)
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International System (SI)In 1799, the International System (SI) also known as the Metric System was developed. It aimed in adopting a uniform way of measuring things for the world.
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UnitsUsed in communicating
measurements and ideas world wide.Funda
mental/Base
• Can be measured directly
Derive
d
• Cannot be measured directly
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Fundamental Quantities for SI unitsLength (m)Mass (kg)Temperature (kelvin)Time (s)Amount of Substance (mol)Electric current (A)Luminous intensity (cd)
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Meter (m)Liter (l)Gram (g)
Kilo Hekto Deca m/g/L Deci Centi Milli
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PrefixesIn addition to
mks units, standard prefixes can be used, e.g., cm, mm, mm, nm
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English SystemQuantit
yConversion
factor1 cm = 0.3937 inch
Length 1 m = 3.2808 feet1 m = 1.0936 yard1 km = 0.6214 statute mile
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English SystemQuantit
yConversion
factor1 g = 0.0353 ounce
Mass 1 kg = 2.2 pounds1 kg = 0.0685 slug1 ton = 2000 pounds1 pound = 16 ounces