AC supply circuit for parallel loads - has two supply lines coupled via double-winding inductors to source and to loads, and has one shaped supply line

摘要

The a.c. supply circuit has three supply lines (a-c), the first connected directly to the first terminal of a single a.c. source (1) and the second and third connected via the two windings of an inductor (21) to the second terminal of the source. Each load (41-44) is connected at one end directly to the first supply line and via the two windings of an inductor to the second and third supply lines. The windings of further inductors (22, 23) are connected into the second and third supply lines between the connections to the inductors leading to the loads. The two windings in each inductor have the same turns number. The advantage lies in protecting persons who accidently touch the network even when the supply voltage is relatively large.