| 摘要 |
<p>The primary winding of the transformer has a screen connected to the mains neutral. The secondary is constructed of superposed winding layers, one of which is connected to the secondary side reference potential in order to prevent capacitive leakin of interference voltages or currents. The secondary winding (6) has output terminals (7a, 7b) and an additional third tap (11). The tap is connected to the secondary side reference potential (5), and serves for removing the interference capacitances. The tap is connected to a point at the lower winding layer (6a), away from the beginning of the secondary, in order to provide a symmetric equalising of the interference capacitances for the secondary. The input circuit (1, 1a) is the transformer incorporate a pole changing switch (10) for the primary.</p> |
