, , , .
, , . , "" : , . , , ..
. , :
;
, ;
.
: , ; ; (), (, ), (, ).
: . . 3.1.
. 3.1
1 2, , , . , 2π/3, .. 120. . 3.1 . A, B C, X, Y, Z. 3 , 4, .
, 120 .
( ) . 3.2.
. 120. .
. 3.2
, , .
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. 3.3.
(, A) ,
(3.1)
eA = Em sinω t,
eB = Em sin(ω t −120),
eC = Em sin(ω t −240)= Em sin(ω t +120).
( 3.3)
(3.2)
eA + eB + eC =0
:
(3.3)
Ė A = Emej 0= Em (1+ j 0),
Ė B = Eme − j 120= Em (−1/2− j /2),
Ė C = Eme + j 120= Em (−1/2+ j /2).
3.4.
. 3.4
. 3.4 Ė A , . 3.4 , :
(3.4)
Ė A +Ė B +Ė C =0.
, B A, C B, . , (. 3.4) .
. .
, (. 3.5). : (. 3.5)
. 3.5
, . . "" "". . "", "", "".
( ) 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). .
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(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.
(. 3.7), . , , .