engleski

Activation of special protection system after blackout

Technical aspects of the blackout that happened on January 12, 2003 in southern part of Croatia (HR) and Bosnia Herzegovina (BH) are analysed with respect to the role of the special protection system (SPS). Activation of the SPS during chronological sequence of blackout events represents main topic of this paper. The SPS is located at the northern 220 kV link between HR and BH systems and serves for their controlled emergency disconnection. It is shown here that its implementation and proper activation during the blackout prevented northern part of HR system from suffering voltage collapse. Real time measurements are found in several relays that belong to the SPS. These measurements are used as a basis while establishing sequence of events for the most probable blackout scenario. The scenario is simulated by using detailed dynamic model of concerned systems. Numerical analysis confirmed findings from data analysis based on various event recording listings. Root causes and consequences of the blackout are recognised and a set of countermeasures is proposed to the utilities in order to prevent its reoccurrence.

blackout; voltage collapse; special protection system

nije evidentirano