| 摘要 |
<p>PURPOSE:To eliminate the need for another power supply for preparatory exictation by actuating a commutation circuit of a main thyristor by means of a battery at all times though the mian thyristor is changed over and connected to the armature side from the battery side. CONSTITUTION:Power travelling operation or braking operation is conducted in such a manner that a series circuit of a main thyristor T1 and a field system FL is connected in series or parallel with an armature A by controlling power travelling- braking change-over relays BC1, BC2. When braking operation, the energy of the armature A is regenerated to a battery B through a regenerative diode D1. A commutation circuit of the main thyristor T1 is formed by a connecting a parallel circuit of a commutation reactor L1, an auxiliary thyristor T3 and a commutation capacitor C1 between a commutation thyristor T2, an anode thereof is connected to a battery B, and a cathode of the main thyristor T1.</p> |
