A thyristor tower marks the tower-like arrangement in series of switched thyristors in a static inverter valve of a HVDC- station. Thyristor towers in static inverter-resounds on insulators set up or at the cover hung up. As a rule a thyristor tower four valve functions beeinhaltet. For the setting up of a complete static inverter in a HVDC station three thyristor towers are necessary in this case.