Análise da superação de tensão de restabelecimento transitória em disjuntores de alta tensão no sistema-teste IEEE 30-barras: um estudo de caso

Abstract

This work is a case study of transient recovery voltage (TRV) induced failure in high voltage circuit breakers for IEEE 30-bus test system. The transient recovery voltage is defined as an electromagnetic transient that appears at the circuit breaker terminals when they open, appearing after the electric arc generated by the contacts opening is dissipated when the current passes through zero. This overvoltage can have high frequency and cause failures like arc reignition and considerable damage to circuit breakers subject to it due to its magnitude, which justifies the studies carried out on this phenomenon. Circuit breakers fails when the values of the dielectric and thermal components the device supports are extrapolated, either by the TRV amplitude or by its rate of rise (RRRV – rate of rise of recovery voltage), when compare to envelopes defined by technical standards. The analysis is based on IEEE C37.06-2009 standard, with Test Duty - 100, 60, 30 and 10 percent, for phase-to-ground and three-phase faults. The results obtained demonstrated that the location of the fault and its magnitude directly interfere in the process of TRV induced circuit breaker failure. In addition, when the rated interruption capacity for test duty T100 is not exceeded, consequently the capacities for T60, T30 and T10 are also not exceeded.