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This article presents two new electrical power terms called effective active (P ef ) power term and effective reactive (Q ef ) power term. These two terms, can approve the orthogonality relationship between fundamental and distorted components.At the same time, these terms are necessary to complete the form of the right-angled power triangle which is compulsory condition to calculate the total apparent (St) in the non-sinusoidal systems.This paper also, offers a new definition for the total apparent power St or can be called effective apparent power (S ef ) in nonsinusoidal situation in order to avoid the misconception of the old definitions. Moreover, it shows a new power diagram represents all power components in one diagram consists of six right-angled triangles called the right-angled triangle (RAT) diagram.

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