.
P = U 1 I 1cosφ1 + U 2 I 2cosφ2 + U 3 I 3cosφ3,
U I.
, .. U 1 = U 2 = U 3 = U , I 1 = I 2 = I 3 = I φ1 = φ2 = φ3 = φ P
P = 3 U I cosφ,
( )
P = U I cosφ.
, , (. 6.4 ). , , R .
, , (. 6.4 ), r, , . .
. , , (. 6.4 , ). , . .
, (. 6.4 ). , , :
p = p 1 + p 2 + p 3.
:
p = u 10 i 1 + u 20 i 2 + u 30 i 3, (6.4)
u 10, u 20, u 30 ; i 1, i 2, i 3 .
i 1 + i 2 + i 3 = 0,
i 2 = ‒(i 1 + i 3). (6.5)
(6.5) i 2 (6.4) , :
p = u 10 i 1 + u 30 i 3 ‒ u 20 (i 1 + i 3) = u 10 i 1 + u 30 i 3 ‒ u 20 i 1 ‒ u 20 i 1 = i 1 (u 10 u 20) + i 3 (u 30 u 20).
u 10 u 20 = u 12 u 30 u 20 = u 32 .
,
p = i 1 u 12 + i 3 u 32.
( . 6.4 ). , ,
|
|
u 1 + u 2 + u 3 = 0,
.
,
P = I 1 U 12cosβ1 + I 3 U 32cosβ2,
β1 U 12 I 1; β2 U 32 I 3.
(. 6.5) (), (. 6.4).
. (W 1, W 2, W 3) , , (. 6.6). . (. 6.6) R 1, R 2 R 3 1, 2 3.
:
P 1 + P 2 + P 3 = U 10 I 1cosφ1 + U 20 I 2cosφ2 + U 30 I 3cosφ3.
, .