| Definition: | one of the three symmetrical sequence components which exists in symmetrical and unsymmetrical three-phase system(s) of sinusoidal quantities and which is defined by the following complex mathematical expression:
X1 = 1/3(XL1 + aXL2 + a2XL3)
where a is the 120 degree operator, and XL1, XL2 and XL3 are the complex expressions of the phase quantities concerned, and where X denotes the system current or voltage phasors
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