Dkangell
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editHello, Dkangell, and welcome to Wikipedia! I hope you like the place and decide to stay. Unfortunately, one or more of the pages you created, such as 3rd order harmonic, may not conform to some of Wikipedia's guidelines, and may not be retained.
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I choose to edit the Harmonics (electric power) page because it lacked information on the 3rd order harmonic and why it is special when compared to other harmonics. It is modeled by the 0 sequence, and therefore each phase's 3rd order harmonic will add constructively with the other phases 3rd order harmonics. This leads to currents in the neutral wire, which can be dangerous since it is designed to carry minimal current.