| 摘要 |
1. Process for the overswing-free switching-on and switching-off of a capacitance (3) lying in series with an inductance between two conductors (1, 2) of an alternating current voltage circuit, by means of a switch (5) lying in series with the capacitance, with the following process steps : a) by the short-term closing of the switch (5) the capacitance is charged from the voltage (Uw ) between the conductors (line to line voltage) in a semi-oscillation to the peak value of the operative capacitance voltage, b) the charged capacitance (3) is switched-on by closing the switch (5) when the voltage at the switch reaches a minimum, c) for switching-off the capacitance (3) the switch (5) is opened during zero passage of the current flowing through the switch ; and d) after opening the switch the capacitance is discharged, characterized by the following features : e) discharging of the capacitance (3) is effected uncontrolled according to a discharging characteristic (resistance 10), the time constant of which is a multiple of the alternating current voltage period, and f) for the capacitance charging the closing moment of the switch (5) (charging closing angle), with respect to the alternating current voltage from the mains, is determined in dependence on the voltage (Uc ) at the capacitance in such a way that even when there is a residual capacitance voltage still present, charging is effected to the peak value of the operative capacitance voltage. |
