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, , 120o, . , , .
, , .
. , , 120o. , 120o. .
.
( , , ), - ( X, Y, Z ). .
: . , . , , .
, , , , . , . , , . 7. 1.
. 6.1
, , , N N' () .
. .
, - . , .
I = I.
ZN - .
(7.1)
. 6.2 .
. 6.2
,
√3 .
U
= √3 U
, . , .
. 6.3 , .
. 6.3, , , .
U
= UIA, IB, IC - ;
Iab, Ibc, Ica- .
, b, .
. 6. 3
.
. 7.4 , . , . , .
. 6.4
,
,
I = √3 I- .
, , , , . , , -, , , : . -, , , , , . , "". .
, , .
. 7.5 . (ZA ≠ ZB ≠ ZC )
ZN .
.
(6.2).
.6. 5
(6.2)
( ):
(6.3)
(6.4)
.
1. . ZA = ZB = ZC = R.
,
, .
:
.
, , .
. 6.6 .
2. , RA< RB = RC, : ZN = 0.
. 6.6
.
. 6.7 , , , , .
. 6.7
3. , RA< RB = RC, ,
, :
. , . .
- .
. .
. 6.8 . . , .. .
. 6.8
.
(6.5)
(6.5) .
:
.
.
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