Transformer switching inrush current and harmonics: The Power System measurements were carried-out at 33kv primary bus, across a 150mva, 33kv/1120v, Electrical Arc Furnace Transformer, supplying to a 180 Ton EAF Furnace, connecting through a set of 2nos. 2000A, 33kv, in parallel, SF6 Circuit Breakers. The captured current waveforms and harmonics bar graph, as shown in the caption picture above, is a rarity since it is shot/recorded at the same microsecond/ millisecond instant of a transformer switching ON.