Probability Evaluation of Occurrence of Ferroresonance in Montazer Qaem 63kV Substation

Catastrophic circumstances and equipment failures in electrical networks are mostly caused by emerging non-linear phenomena. Resonance and Ferroresonance are those phenomena, which have been investigated since, many years ago. Montazer Qaem 63 kV substation is susceptible to ferroresonance due to existing underground cable network and capacitor bank. Ferroresonance conditions are generally initialized in effect of short circuit, breaker phase failure, transformer energizing, load rejection, accidental or scheduled line disconnection, and over voltage in the network. In this paper by means of PSCAD/EMTDC simulation software, probability of occurrence of ferroresonance is examined in Montazer Qaem substation. Several ferroresonant configurations are considered in the network and results are analyzed. Ferroresonance states are classified in to adequate modes by Ferroresonance detection tool. Finally, some solutions to suppress ferroresonance applicable to substation are recommended.