1.6 (. . 1.18, ) . 50 - , : , .
Z1 = 1 + jx1, Zm=rm + jxm, Z2=r2'+ jx'2 ( ), . , (..) (.).
. (Z=∞, I 2 = 0). (1.34)
(1.40)
, .. 0 , ( ) I02r1, ( ) . I0, 210% I1, I02r1, , .. . (. 1.14).
. 1.29. .. (), ()
.. . 1.29, . , , U1, ; U20 ; 0 .. I0.
, , 0 1,15U1. .. , ..: .. I, .. 0 .. sφ0 U1 (. 1.30).
. 1.30. ..
, U1.
U1 (. 1.29, ). .. :
|
|
|
(1.42)
(1.43)
P' P" ; U1 I0 .
.. :
k = U1 / U20 = w l/ w 2;
. . U1 ( )
i0=(I / I 1 )100; (1.45)
.. 0.
.. (. 1.8), P , . 1.29, . .. I0(r1+jx1) (. 1.31) , , , :
|
.. i 0=10÷0,6%.
.. I 0 .. P0, U1, , , : .
. 1.31. ..
1.4. . 1.30 (I =20,5; sφ0=0,08) : S = 100·; Ul ,/U2 = 6,3/0,22 ; Y/Y. zm, rm U2 = 127 .
. (1.46)
(1.47),
(1.48)
(1.45)
U 2 .
. , (z = 0), U2 = 0. , U1, (. 4.1).
. 1.32. .. (), (6)
.. (. 1.32, ), , UK., .. (I1 = I1) (I2 = I2) . .., .. I1, .. cosφK .. U(. 1.33).
|
|
. 1.33. ..
, .1.32, , .. .. :
(1.49)
(1-50)
..
cosφ= /(3 U I1) (1-51)
. ..
(1-52)
(1.52) PK¢ K¢¢ , .
, , % :
u=(U/U1)100 (1.53)
u = 5-10% U1HOM.
(1.20), U1. .. 10% U1HOM, . , . (1.24)
(1.54)
.. (. 1.34, ).
. 1.34. () () ..
, (1.55)
(1.56)
..
ZK=rK+jxk, (1.57)
xk .. ZK.
(1.54) (1.55), .. (. 1.34, ). .. UK = I1 KZK. φ UK .. I1 K = I2 K. I1Kr1, jI1Kx1, I2Kr2 j I2Kx2, , . :
(1.58)
U. U. .., .
, ..:
zk, , sφ .. u +75 :
.. θ1; α = 0,004 .
.. m , , , . , , k, .., :
.. +75 :
1.5. 100 - (5,3/0,22 , Y/Y . 1.1 ( ). : .. I1k, .. Pk cosφK Uk.
. , () .. UkHOM=190 , .. Ik =I1= S /(√3 U1.HOM)=100/(√36,3)=9,15 ( 4 . 1.1).
1.1
UkA, B | UkB, B | UkC, B | IkA, A | IkB, A | IkC, A | Pk, B | |
2,9 5,1 7,2 9,2 | 3,0 5,0 7,0 9,2 | 3,1 5,0 7,2 9,1 |
|
|
( ) .. (1.49)
U. = (191 +189 +190)/3 = 190 .
( ) .. (1.50)
I1k=(9,2+9,2+9,1)/3=9,15.
: .. (1.59) zk=U./I1=190/9,15=20,8; .. Pk = I1k2rk, ..:
rk = Pk /(3 I12)=1780/(39,152) = 7,1 ;
.. (1.61)
θ1= 20 , +75 : . . (1.62)
rk75= 7,1[1 + 0,004(75 - 20)] = 8,6 ;
..
.. (1.64)
k75=3I1k2rk75=39.1528.6 =2160 ;
(1.64)
cosφk75 = rk75 /zk75= 8.6/21.5 = 0,40;
.. (1.65)
uk75 =(I1k zk.75/Ul)100 = (9,1521,5√3/6300)l00 = 5,4%.
.. .. . 1.2, (. . 1.33).
1.2
U, | I1k, | k75, | cosφk75 | |
9,15 | 0,40 0,40 0,40 0,40 |