Z AB, Z BC, Z CA (.7-1), , Y - , Z , .
.7-1.
.
Z AB = Z BC = Z CA = zej φ, (7.1)
.
, U .
U = U . (7.2)
, ,
I = U / Z , (7.3)
U - , Z - .
I AB = I BC = I CA = I (7.4)
j = j = j = j, (7.5)
j = arctg (x / r ), (7.6)
x - , r - .
I A, I B, I C I AB, I BC, I CA
I A= I AB - I CA;
I B= I BC - I AB; (7.7)
I C= I CA - I BC.
,
I A + I B + I C =0 (7.8)
, ..
I = I =1,73 I (7.9)
, . .
30 (pc.7-2).
j, (.7-2).
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, (7.1), , , (.7-2).
) )
.7-2. : ) , )
, , , , . , , . , - , , .
(.7-3) . , , (.7-1).
(.7-3) :
U = U + U (7.10)
, :
IAB = ICA
(7.7) (.7-3), :
IA = - IAB - (- ICA) = - IAB + ICA =0;
IB= IBC - (-IAB) = IBC + IAB; (7.11)
IC= -ICA - IBC = - (IBC + I)= - IB.
(.7-2) (.7-3) (.7-4).
, ,
=UACIAcos(UAC^IA)+UBCIBcos(UBC^IB) (7.12)
, . , , (.7-5)
P = PW1 + PW2 (7.13)
.7-3.
.7-4. ( )
.7-5.
1. U = 220 , U = 127 .
2. .
3. .
4. .
5. - 6 2 .
6. 250 .
, , . . .
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.7-6.
.
1.
(.7-6). . 1 .
2. ( ). , 250 , , .
3. , - ( 1 ). . 2.
4. ( 1 ), . , :
) ;
) - ( ).
, .
5. , , 2, 3, 4 1.
6. :
= UAB IAB cos φ AB,
C = UBC IBC cos φ BC , (7.14)
CA = UCA ICA cos φ CA.
(7.14) cos φ = 1.
.7-1.
7. .1. .
.7- 1.
. |
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IA | IB | IC | IAB | IBC | ICA | UAB | UBC | UCA | PW1 | PW2 | ∑PW | P | ∑ | ||||
A | A | A | A | A | A | B | B | B | |||||||||
. . | |||||||||||||||||
. |
1. , (.7-7). , - , - . .
2. , , , ( , , ). , , .
.7-7.
3. , , , ( , , ). , 250 ).
4. - ( ). , . .
5. ( 2,3,4) .
|
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. 7-2.
6. . 2. . , 90˚ (.. ).
.7- 2.
/ | I | I | I | I | I | I | U | U | U | |
1. .
2. .
3. , .
4. .
5. .
6. .
7. .
8. .
1. ?
2. ?
3. ?
4. ?
5. ?
6. ? ?
1. []: / . . . .- .: , 1976. - .7., .156-158, .160-161
2. , .. []: / .. , .. ; - .: , 2002. - .12, . 339-356.
3. , .. . []: - .: , 2001. - 1.28.
8