SWITCH FOR SHORT-CIRCUITING A MODULE OF A MULTISTAGE CONVERTER, AND METHOD FOR SHORT-CIRCUITING THE MODULE

摘要

The invention relates to a switch (1) for short-circuiting a module of a multistage converter, comprising a movable first contact piece (4) which rests against a second contact piece (5) when the switch is closed. The short-circuit time is substantially reduced by a) an energy storage device (9), by means of which a force (F) acting in the direction of the second contact piece (5) is applied to the first contact piece (4) when the switch (1) is open, b) a mechanical spacer (6) that is arranged between the two contact pieces (4, 5) when the switch (1) is open and holds the first contact piece (4) to which the force is being applied at a specified distance from the second contact piece (5), wherein the applied force (F) brings the first contact piece (4) into contact with the second contact piece (5) after the first contact piece is released by the spacer (6), and c) a short-circuiter (11a) which establishes a temporally preceding electric connection between the two contact pieces (4, 5) arranged at a distance from each other when a specified voltage is applied to the two contact pieces (4, 5), said electric connection being established when the spacer (6) is removed. The short-circuiting method has corresponding method steps.