| 摘要 |
<p>In order to provide an apparatus (1) for switching direct currents in one terminal of a DC voltage grid comprising two connection terminals (2, 3) for introducing, in series, the apparatus (1) into the terminal, an operating current path (4) which extends between the connection terminals (2, 3) and in which a mechanical switch (5) is arranged, a capacitor branch (6) which bypasses the mechanical switch (5) and in which a capacitor C1 is arranged, a pulse-controlled power semiconductor switchΤ1, which is arranged in series with a capacitor C1, for discharging the capacitor C1 so that a pulse circulating current, in the opposite direction to the operating current I in the mechanical switch (5), flows in a mesh formed from the operating current path (4) and the capacitor branch (6), with which apparatus, even after a short period of time, a renewed switching operation can be implemented, it is proposed that a polarity reversal branch (9) is provided which bypasses the capacitor C1 and in which a drivable polarity reversal power semiconductor TZ1 is arranged.</p> |
