Transformer for multisystem rail traction unit, has primary winding, pull-in secondary winding and additional secondary winding, where secondary windings cooperate to generate leakage inductor for smoothing waves affecting direct current

摘要

The transformer has a primary winding (4), a pull-in secondary winding (5) and an additional secondary winding (6). The winding (6) forms open circuit and short circuit respectively in alternating and direct modes while the windings (4, 5) are supplied with alternating current and direct current, respectively. The winding (6) cooperates with the winding (5) to generate a leakage inductor for smoothing waves affecting the direct current.