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电路原理_skja_38

电路原理_skja_38

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三 三 三 三 三 三 三 三 三 三 三 三 三 三 三 三 三三三 三三三三三三三三 三三三 三三三三三三三三 三三三三三三三 三三三三三三三
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1. 三三三三三三三三三三三 P 三三三三三三三 三三三三三三三 三三三三三三 Z ϕ P p = U p I p cos ϕ 三三三三三 P =3 P p =3 U p I p cos ϕ p l p l I I U U = = , 3 : Y三 φ I U φ I U P l l l l cos 3 cos 3 1 3 = = p l p l I I U U 3 , : Δ = = φ I U φ I U P l l l l cos 3 cos 3 1 3 = =
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三三三 (1) ϕ 三三三三三三三三三三三三三 ( 三三三三 ) 三三三三三三三三三三三三三三三三三三三 (2) cos ϕ 三三三三三三三三三三三三三三三三三三三三三三三三 cos ϕ A = cos ϕ B = cos ϕ C = cos ϕ 2. 三三三三 Q=Q A +Q B +Q C = 3 Q p p p l l I U P I U P φ 3 3 cos = = (3) 三三三三三三三三 φ I U φ I U Q l l p p sin 3 sin 3 = =
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3. 三三三三 三三三三三 P Q S 三三三三三三三三 4. 三三三三 l l p p I U I U Q P S 3 3 2 2 = = + =
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