| 摘要 |
An overvoltage protective device for a series capacitor (C) has a main spark gap (1) and an auxiliary spark gap (2), arranged adjacent thereto, for ignition of the main spark gap. A second auxiliary spark gap (3) is arranged in association with the first auxiliary spark gap for ignition thereof. The auxiliary spark gaps are connected between one of the electrodes (11) of the main spark gap and a voltage divider which comprises resistors (R1, R2, R3) and a varistor (VR1). When the knee voltage of the varistor is exceeded, the second auxiliary spark gap (3) is ignited, the arc of which initiates ignition of the first auxiliary spark gap (2), the arc of which in turn moves towards and ignites the main spark gap (1). During the arcing time of the spark gap (2), a controlled discharge of the series capacitor through a resistor (R2) takes place. |
