, , , , , (. 5.7).
, :
= = =0 (5.6)
, .
. 5.7 Z, Z, Z . , , .
(U, U, U), , (I, I, I) (I, I, I) . , :
A= A- A;
= - ; (5.7)
= - .
, . , , :
A+ + =0 (5.8)
(U, U, U), 120 (. 5.8).
. 58.
I, I, I φ, .
, (5.7), , . A, A (- A), . . A, . .
120 , A, (- A) A. , I/2 =Icos30. , I = I. , , , , .
. , 220 , 220/127 380/220 . ( . .), . ( ) , .
|
|
:
=++=
IU + IU + IU . (5.9)
,
=3IU . (5.10)
, . U = U / I = I, U = U I= I/ . , , :
=3 I U = IU . (5,11)
, , :
S = IU;
P = IU ; (5.12)
Q = IU .
, . . (. 5.9) ( ), ( ), , ( ).
. 5.9 |
. :
1. , (. 5.10).
5.10
, .
:
P = IU . (5.13)
2. , , (, ). , R (: 5.11).
. , , , . .
3. , . , (. 5.12).
.
.
|
|
5.12
4. . . , . - , () , (. 5.13).
. .
, :
. 5.13 |
=12+23+31 = 12 u 12+ 23 u 23+ 31 u 31. (5.14)
( , ) :
u12+ u23+u31=0. (5.15)
(5.15) :
u12= - u23 - u31;
u23= - u12 - u31; (5.16)
u31= - u12 u23;
(5.14), :
= 12 (- u23 - u31 ) + 23 u 23+ 31 u 31= u31 ( 31 - 12 )+u 23 ( 23 - 12). (5.17)
i12 i31 = i1, i23 - i12 = i2 u31 = -u13,
P = u13 i1+ u23i2. (5.18)
, , .
1. .
2. ?
3. ?
4. ?
5. ?
6. ?
7. ?
8. ?
9. ? ?