( ) X, Y Z N, ( ) (. 3.6). (Za, Zb, Zc) n. .
. 3.6
A − a, B − b C − c, , , N − n, N n , .
, .
. U (UA, UB, UC ; Ua, Ub, Uc ). , , . (UA = Ua, UB = Ub, UC = Uc). .
(U ) (UAB, UBC, UCA). , , (. 3.6).
:
(I ) .
(I ) .
(3.5) I = I .
, , IN. n (N)
(3.6) İ N =İ A +İ B +İ C.
. 3.7
.
(3.7) Ú AB =Ú A −Ú B; Ú BC =Ú B −Ú C; Ú CA =Ú C −Ú A.
. 3.7 , , : UAB, UBC, UCA 120 ( U ), , , UA, UB, UC, (U ) 30.
- (3.8), , :
U =2 U cos30 (3.8) U = U .
:
U =660; U =380;
U =380; U =220;
U =220; U =127.
(. 3.12) X , Y , Z c . , .
|
|
. 3.12
, ĖA + ĖB + ĖC = 0.
, .. , . , .
. .
(3.18) U = U.
, : Uab = UAB, Ubc = UBC, Uca = UCA. Zab, Zbc, Zca İab, İbc İca. Úab, Úbc Úca . İA, İB İC .
.
(3.19) İab = Úab / Z ab; İbc = Úbc / Z bc; İca = Úca / Z ca.
, a, b c ( 3.12)
(3.20) İA = İab - İca; İB = İbc - İab; İC = İca - İbc.
, (3.20),
(3.21) İA + İB + İC = 0,
.. , .