1-20
, .
() (∆).
1-20 . : ∆
:
UAB, UAC, UCA ( UL)
- UA, UB, UC ( U)
IA, IB, IC ( I = IL)
, , : UL= *U
1
.
UL=380 . =100 . : NA=40, NB=30, Nc=60. . 1
U, I, IL , , .
m1=6 /, mu=44 /.
I0.
:
: UL=380 , I0
=110
NA=40
NB=30
Nc=60
mu=44 /
m1=6 /
: U, I, IL, P, I0 . 1
1) :
UL 380
U 1.73 220 B
.
2) :
=*NA=100*40=4000 .
=*N=100*30=3000 .
=*N=100*60=6000 .
3) , (cos =1):
PA 4000
I U 220 18.2 .
P 3000
I U 220 13.6 .
P 6000
I U 220 27.3 .
4) :
=++=4+3+6=13.
5) :
U 200
IU mu 44 5,
IA 18,2
IIA m1 6 3,
IB 13,6
IIB m1 6 2.3,
IC 27,3
IIC m1 6 4.6,
(.2)
UAB
UA
IA IB
Ic
UCA Uc I0 IB
Ic UB
.2 UBC
UA, UB, UC 1200 , 5 . , UAB, UBC, UCA.
, , .. IA UA, IB UB, Ic Uc, .5 .
I0 , : IB IA, Ic IB.
IA, Ic.
|
|
:
I0= II0*m1=1.8*6=10.8 A
II0- .
.
:
- UAB, UBC, UCA ( UL=U)
- IA, IB, ICA ( I )
- IA, IB, IC ( IL)
:
U
I Z;
UL=U;
IL= * I;
= *U* IL* cos;
: IA
UL U=U IAB
IA Z IB RCA RAB
UL ICA RBC
IB Z U=U
UL IC I
ICA Z
.3
3=++
.
2 .
2
UL=220 (. 4) R=22 , R=11, R=14.67 .
IA, IB, ICA, .
mu=44/, ml=5/ .
IA, IB, IC.
:
: UL=220 B.∆
R=22
R=11
R=14.67 .
mu=44/
ml=5/
: IA, IB, ICA, .
, IA, IB, IC.
1) UL= U 220 B ( ∆).
2) :
U 220
IAB RAB 22 10 A
U 220
IB RB 11 20 A
U 220
I R 14,67 15 A
3) :
=++
cos =1 :
=U*I;
=U*IAB=220*10=2200 ,
=U*IB=220*20=4400 ,
=U*I=220*15=3300 ,
=2,2+4,4+3,3=9,9 .
4) :
U 200
IU mu 44 5,
IA 10
IIA m1 5 2,
IB 20
IIB m1 5 4,
IC 15
IIC m1 5 3,
(.4)
UAB
IA IAB
ICA IBC IB
UCA UBC
. 4
UAB, UBC, UCA 1200 , UAB ; 5. (), , .. IAB UAB, IBC UBC, ICA UCA.
, . IIA, IIB, IIC.
:
IA= IIA*m1=4,4*5=22 A
IB= IIB*m1=5,3*5=26,5 A
IC= IIC*m1=4,4*5=30,5 A
21-40 1.9 . , , , .
|
|
, : =U+IA*RA
- : =U-IA*RA
9550*2
n
2 ;
n .
.
2
n 1 * 100%
2 ;
1- .
. , 100%. , , ͻ: U, I, n .. , , , .. I=I. .
I=I+IB
I=I-IB
3
(. 5) U=200 B. R=0,2 ; R=55 . U=110 . (2=6). N=240 , 2=6. =0,05 . n=1200 /.
; , ; ; , ; .
R
I=I
R I
R
R2
. 5
1)
** n*N 0,05*3*1200*240
60 60*3 240 .
2) , , =U+Ia*Ra. ,
E-U 240-220
Ia=I Ra 0,2 100 A
3)
U 110
I R 55 2 .
4)
2=U*I=220*100=22000=22.
5) ()
U 220
R I 100 2,2 .
4
U=120 ; R=3 , R=50 .
, I, 1, , n=0,8. . 6.
R
I
Id
I
R
. 6
1), ( )
U 120
I R 3 40 .
2)
U 120
I R 50 2,4 .
3)
Ia=I+I=40+2,4=42,4 .
4)
= U+ I*R=120+42,2+0.2=128,5 .
5) ,
|
|
2 4,8
1 n 0,8 6 .
5
, .7, U=220 n=450 ./. I=680 ; - =209 , R=44 .
Ia; R; 2; 2, n=90,5%.
I
Ia
IB
.7
1)
UB 220
I RB 44 5 A
2)
Ia=I-IB=680-5=675 .
3)
U U 220-209
Ia R; R Ia 675 0,016 .
4)
1=U*I=220*680=15000 = 150 .
5)
2=1*n=150*0,905=136 .
6)
9550*2 9550*136
M2 n 450 2880*
6
U=440. n=1000 /., M2 =200 H*; n=86%; R2 =0,4 ; R =0,3 .
P2; 1 ; I, , ∑;- .
. 8.