:
() U Z = 300 .
U , h, f, L = 0,5⋅106 /, R =10 .
U, | |
U, | |
h, | |
f, | |
I, | |
, |
: , I () τ= 106 :
;
;
.
:
1. , .
: α = I/ τ=30/1=30 /, τ () .
: U = R I + L h α=10*30+0,5*10-6*18*30*106=570, R ; I ; L ; h .
.
, U = I Z /2=30*300/2=4500 , Z .
U = U + U = (k + k ) h I / a ≈ 30 h I / a= 30*15,3*30/14=1157,1
. (U ) (U ) (U ) .
: h = h 2 f / 3=18-2*4/3=15,3 , h ; f .
2. , .
U / U = U / U =(570√3)/(110√2)=6,35
U / U = U / U =(4500√3)/(110√2)=50,1
U / U = U / U =(1157,1√3)/(110√2)=12,8
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U ; U () () .
3. , .
(U ), (U ), (U ) (U).
:
U = R I + L h α ≈ R I ≥ U ;
570<650.
U = I Z /2 ≥ U ;
4500≥650
U = 30 h I / a ≥ U.
1157,1≥650. .
4. I , , :
I = U / R =650/10=65
I = U / (Z / 2)=650/(300/2)=4,3
I = ⋅ U / 30 h =14*650/(30*15,3)=19,8 .
5. I ≥ I . , I (I ) = (0,04 I ).
, :
.= (I ) = (0,04 I )= (0,04*65) =0,074=7,4%
.= (I ) = [0,04 I ]= [0,04*4,3]= 0,84=84,2%
.= (I )=(0,04 I )= (0,04*19,8)=0,453=45,3%
:
, .=84,2%.