| 摘要 |
<p>A supply circuit for a two-wire line is included in a DC-magnetized hybrid transformer in which the two primary windings (l1, l2, l1', l2') are magnetically coupled to two pairs of secondary windings (l3, l4). The primary winding is divided into two parts to form an auto transformer and the supply circuit (Eo, R1b, R2b) is connected to the common connection points of the parts. The supply circuit includes two resistor networks which each consists of a PTC-resistor (Rp1, Rp2) in parallel with a temperature dependent resistor (R1, R2) to limit the feed current at varying line length.</p> |
