EHV power transmission 1 Electric power transmission networks 1 Electric transformer testing 1 Electromagnetics 1 Experimental confirmation 1 Harmonic resonance 1 Power system restoration 1 Real networks 1 Resonant phenomena 1 Restoration 1 Restoration paths 1 Restoration procedure 1 Transformer energization 1 Weak network 1 harmonic resonances power system restoration 1 transformer energization 1 weak networks 1