Abstract: An arrangement and a method for reactive power compensation in connection with a power transmission line. The arrangement includes at least one transformer and at least one reactive power compensator connected to the low-voltage side of the transformer and at least one adapter reactor, the adapter reactor being connected in series with the transformer so that the reactive power compensator is connected to the power transmission line via the transformer and the adapter reactor.

Abstract: An arrangement and a method for reactive power compensation in connection with a power transmission line. The arrangement includes at least one transformer and at least one reactive power compensator connected to the low-voltage side of the transformer and at least one adapter reactor, the adapter reactor being connected in series with the transformer so that the reactive power compensator is connected to the power transmission line via the transformer and the adapter reactor.

Abstract: The invention relates to an arrangement and a method for switching an inductive load. Yet further the invention relates to a software product of a control system switching an inductive load. A semiconductor valve is used for switching an inductive load. The semiconductor valve comprises at least two semiconductor levels. A firing signal is supplied to the semiconductor valve. There is a determined delay between the firing signals of at least two semiconductor levels.

Abstract: 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.