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Power Quality

Horizontales
An increase in nominal voltage of 10%
Tool that can be used to visually represent temperature differences in equipment
A measurement for which a meter must be connected in parallel with the load
Condition that exists when supply voltage drops below 10% of nominal
A long duration swell
An amplituede modulation of the power frequency sine wave which in some cases can be seen in the form of light flicker
Verticales
Diagram that represents magnitude and directional relationship of current and voltage using vectors
The maximum amount of voltage to which a test instrument can be exposed without damage
A long duration voltage sag
Tool used to measure two or more electrical values - principally voltage, current, and resistance
A decrease in nominal voltage of 10%
A measurement for which a meter must be connected in series with the load.
Frequencies that are whole number multiples of the fundamental frequency
Waveform disruption often caused by the presence of harmonics
Large deviations of the voltage waveform for a short duration
A condition that exists in a three phase system when voltage or current in each phase is not equal