, ( n . 5-1), (., , ). , (Nn . 6-1).
. 6-1.
U, U , U (. 6-1), UA, U , UC .
:
U = UA - U ,
U = U - U , (6.1)
UCA = UC - UA.
IA , IB , IC, , I , I . :
I = I . (6.2)
Za, Z b, Zc
Z a = Z b = Z c = Z (6.)
j , j b, j c
j = j b = j c = j (6.4)
.
IN = 0 (6.5)
,
U = U (6.6)
I U Z ,
I = U / Z (6.7)
..., , UA, U , UC , IA , IB , IC
j = arctg (x / r ), (6.8)
x - ,
r - .
, , , . 6-2.
.6-2.
Z a ¹ Z b ¹ Z c, (6.9)
, , (6.3) , (6.4).
, IA , IB , IC .
|
|
IN = IA + IB + IC. (6.10)
(.6-3,a)., , . , (. 6-2).
) )
. 6-3. :
) ;
)
: , . (" "), . , . (6.6) . (.6-3, ).
(.6-3,) , , , , .
( ) , (A ) . , ( ), () ,.. UA UB , (.6-4)
IN = IA + IB (6.11)
. 6-4.
, . , , .
, - U , U , U , UA, U , UC , , . j , j b, j c UA, U , UC IA , IB , IC.
, , .
P = P + + = UAIAcos j A + UBIBcos j B + UCICcos j C (6.12)
cos j A = cos j B = cos j C = cos j =1, .
:
|
|
P =3 U I cos j (6.13)
:
= + = UACIAcos (UAC ^ IA)+ UBCIBcos (UBC ^ IB) (6.14)
(.6-5), WAC (6.l4), WBC - . , .
. 6-5.
1. U = 220 , U = 127 .
2. .
3. .
4. .
5. - 4 . 2.
6. 250 .
, , . . .