In a transmission system consisting of doublecircuit transmission lines or parallel lines on the same right-of-way, the circuits are coupled through the magnetic flux and the electric field and therefore have both capacitive and inductive coupling. When a circuit is tripped out, the companion energized circuit induces voltage on the circuit through the corresponding capacitive coupling. In the power system of Figure 13, a double-circuit transmission line is terminated at Station B by the power transformers T1 and T2, which are energized/deenergized by the remote circuit breakers CB1 and CB2 at Station A. the transformers are connected to the associated lowvoltage networks through circuit breakers CB3
and CB4. Figure 14 shows a simplified circuit of Figure 13.