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transformers
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39
3. . . . - . . . . . 98%. . 3.1 , . To , , , . . . , . . , . . .
40
3.1 . , ( ) ( ). .
3.1 3.1 . . . . . 3.2 , .
3.2
41
( 3.1). 3.3. .
3.3 , , . 3.4 , .
3.4 , , . .
42
, . . , ( ). 3.5 .
3.5 . , . 3.6 . 3.2 )
43
. 25 VA.
3.6 ) . . ) . . 10 MVA. ) , . 50 VA. 3.3 3.7 . ( ) U1. ( ) .
44
. 2
3.7 2 = 4.44fw2 f z w2 o E2 U V. w2 , . , , U1. 1 = 4.44fw1 w1 . . (1). ( 0.5%), . , .
45
3.4 , (1 5% 10% ). (R1) R1 , (1) , . U1 1 : U1 = E1 U2 = E2
kww
fwfw
UU ===
2
1
2
1
2
1
44.444.4
. k . 4 5% 1% . . 3.5 , U1, 2. 1. . . .
46
3.8 1 2
kww
II ==
2
1
1
2 12 kII =
kww
UU ==
2
1
2
1 kUU 12 =
H , . . , . , . , P1 2 1 = 2 U1I11 = U2I22 U2I2 = U1I1 1 = 2 ,
47
. U2 . . ,
%100%2
2
N
N
UU=
% 5% . , . 3.9 . .
3.9
%1001
1
N
Kk U
Uu = U1K 2. 6 7%.
48
10022K
NK u
II = 3.6 3.10 .
3.10 U V ( 1 2) u v ( a b x1 x2). , 3.10, n np xo. U u U. , n u v , . . , 3.11.
49
3.11 , . , , . . 5% 2.5% 15kV 14250V 15750V. . 3.12 .
3.12 U, V, W ( , , C 1, 2, 3). u, v, w ( a, b, c x1, x2, x3). , , x, y, z .
50
, ( p ) n ( mp xo) . U = U/1.73 = 3.13 ( ). U = U = /1.73
3.13 . , ( ). . 3.14.
3.14
51
. 3.1 .
3.1 .
52
D, d Y, y , z (0, 5, 6, 11) . 30 . 3.7 , U V . u v 3.15. .
3.15 . , . , . 3.16 . 3.8 , - : ) VA KVA.
53
.
3.16 . ) ) ) V. . 20000-231/400V 20KV 231V 400V. . ) % ) Dd1. . 3.9 , (P) (P).
PPPP
PP
++== 22
1
2
, .
54
3.17 . .
3.17 3.10 . .
3.18 . 3.18.
55
, . , . 3.19. .
3.19 . , , . 3.20 .
3.20 , .