 Each thyristor tower has 2 valve functions and consist of 8 thyristor modules, which are arranged one on top of the other.Each thyristor module consists of 9 thyristors switched in series and the necessary auxiliary equipment as the saturation coils, which are in series with
the thyristors.Parallel to each thyristor a series combination of a resistor and a capacitor is switched, which limits the speed of current grow.