Unbalance of twin-conductor lines

INDUCTIVE AND CAPACITIVE unbalances are present in transmission lines which are not transposed. Because of the expense and inconvenience involved in making transpositions, it is often desirable to omit them. This is especially true of twin-conductor lines which have certain advantages at extra-high voltages. When transpositions are omitted, it is desirable to compute the resultant unbalance. Considered here is the electrostatic unbalance to ground which is a result of unequal capacitances between the conductors of the three phases and ground. The basic conductor configuration is shown in Fig. 1.