(in amperes) o f an unbalanced three-phase circuit. It is important to note that
the transformation of a-b-c voltages and currents to symmetrical components is
power-invariant in the sense d iscussed in Sec. 8.6, only if each product of
sequence voltage (in volts) times the complex conjugate of the corresponding
sequence current (in amperes) is multiplied by 3, as shown in Eq. ( 1 1 .34). When
the complex power S31> is expressed in per unit of a three-phase volt ampere
base, however, the multiplier 3 disappears.