| 摘要 |
A method and arrangement for triggering a spark gap is disclosed. A series spark gap is triggered such that in parallel with partial spark gaps (1, 2) of the series spark gap there are coupled first voltage distribution means. Further, at least in one partial spark gap (1, 2) there is arranged an additional electrode (10) whose voltage is set to a given level by means of second voltage distribution means. The voltage level of the additional electrode (10) is changed by disturbing the voltage distribution of the second voltage distribution means. Thus the spark gap between the main electrode (6a, 6b) of the partial spark gap (1) and the additional electrode (10) will be ignited. Capacity of the second voltage distribution means is lower than that of the first voltage distribution means and consequently the voltage acting over the first voltage distribution means does not change significantly. Thus the voltage determined by the first voltage distribution means acts over the spark gap that is between the additional electrode (10) and the second main electrode (6a, 6b) of the partial spark gap (1) and that will also ignite, which further results in the supply voltage (U) acting only over the second partial spark gap (2), whereby a spark-over will also occur therein.
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