| 摘要 |
<p>PURPOSE:To avoid magnetic saturation of a transformer or adverse effect due to AC induction by turning on a unidirectional electronic inductor provided in parallel with each of a forward feeding circuit and a return feeding circuit when a loop current flowing to a terminal station exceeds a predetermined threshold value so as to branch a current flowing to both the feeding circuit sections. CONSTITUTION:When the detection circuit 10 detects it that the loop current flowing to the feeding circuits 6, 8 exceeds a predetermined threshold value, its output signal causes the electronic inductors 12, 14 to be turned on thereby bypassing the current component not allowed to the feeding circuit sections 6, 8 to the electronic inductors 12, 14. Thus, the disadvantage due to a large loop current given to the feeding circuit sections such as saturation of transformer is avoided. Thus, the normal operation of the feeding circuit section is maintained.</p> |
