Protection complex for power converters based on turn-off devices

A lot of different semiconductor converters are used in systems of generation and allocation: stations of back-to-back links and high voltage direct current transmissions (HVDC), active filters, different power sources, the grate variety of support equipment etc. All converters are treated by various effects from external circuits. It may be an over voltage at outcome due to the lightning on the HV lines or by a similar effect, it can be over current because of a short circuit mode in the load. At the other hand the converters have many internal problems depended on semiconductor devices fault or the whole shoulder breakdown. To be a converter reliable it is necessary for it to have a set of protective blocks. At this paper we give the list and a brief operating description those of them, which is considered obligatory.