AC	Alternating current.
DC	Direct current.
LVUR	Line voltage unbalance ratio (according to NEMA MG1).
PCC	Point of common coupling.
PVUR	Phase voltage unbalance ratio (according to IEEE Std. 141).
PVUR’	Phase voltage unbalance ratio (according to IEEE Std. 936).
RMS	Root mean square.
VUF	Voltage unbalance factor (according to EN 50160).
VUF’	Voltage unbalance factor (according to CIGRE and IEEE Std. 1159).
VUFT	Voltage unbalance factor according to time (proposed factor).