Overvoltage Analysis Considering Transmission Tower Models Based on Impedances and Inductances

MORALES, JOHN; MONTESDEOCA, JULIO; GUIDI, GUILLERMO

Applied Mechanics and Materials

Trans Tech Publicati

Año: 2015 vol. 775 p. 373 - 377

1662-7482

It is clear that lightning strokes produce overvoltages on Transmission Lines (TLs), whichcan be higher that the Basic Insulator Level (BIL), generating a fault or short circuit. Thus, in order toadequately analyze when a lightning hits on a TL, it is necessary to simulate different elementscorresponding to Electric Power Systems (EPSs) as real as possible. In this context, transmissiontowers are considered crucial parameters in lightning studies, which must be correctly selected andsimulated in order to consider reflected voltage waveforms from cross arms.Based on the above said, this paper presents a comparative study corresponding to the transmissiontower simulation using two models. The first uses inductances, and the second uses distributedparameters impedances characterized by their impedance and travel time.This paper presents voltage variations that exist in each phase, using different lightning features.Alternative Transients Program (ATP) is used to simulate the TL model considering differentlightning currents and the two tower models. Results show that the impedance model analyzereflected waveforms, while that the inductance model does not analyze this issue.