Authors: Gilmar F. Krefta;Carlos E. F. Pimentel; Lucas B. de Oliveira; Sergio L. Zimath w We describe practical fault analysis examples from Companhia Paranaense de Energia (COPEL) using several monitoring technologies, such as Digital Fault Recorders (DFR), Phasor Measurement (PMU) and Traveling-Wave Fault Locator (TWFL) for optimal diagnose, highlighting the benefits of having multiple analytical resources available to the operators and power system engineers