Application of Black-box Modeling of Circuit Breakers to Determine the Most Critical Short Line Fault Conditions

Because of increased steepness of the Transient Recovery Voltage, interruption of short-line faults is the most severe task for almost  all high voltage circuit breakers. On the other hand, to determine the black box models of the circuit breakers, the voltage and current  measurements during high current interruption tests are normally used. In this paper, different black-box models for circuit breakers  are used to study short-line fault (SLF). Parameters of different black-box models are estimated based on the measurements. The  implemented models are used to simulate the faults occurring near the circuit breaker terminals (short line faults). The critical length  of the line is determined. The results indicate that the interrupting capability of the circuit breaker is enhanced when the shunt  capacitor at the line side is increased. As a concrete case, a part of the Tehran electricity network is considered; the evaluations  indicate that the circuit breakers utilized in the considered network can clear all possible faults.

S. Hasanzadeh, K. Niayesh Y. Sheikhghomi, J. Pahlevani
High Voltage Laboratory
School of Electrical and Computer Engineering
University of Tehran
Tehran Regional Electric Company

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