7.1. .
7.2. .
7.3. .
7.4. .
7.5. .
.
xa = xb = xc = 6; ra = rb = rc = 8 U = 220 , , (), (Q) (S) . .
7
1.1. .
1.2. .
1.3. .
.
.1.1. Zab, Zbc, Zca . , , , , .. U = U.
.7.1. .
:
; ; . (7.1)
, a, b, c:
;
(7.2)
.
.1.2. :
Zab - ;
Zbc - ;
Zca .
.7.2.
.
(Zab = Zbc = Zca) Iab = Ibc = Ica = I, IA = IB = IC = I , ..
I= I (7.3)
, , .
: , , .