() (. 18.3.1), RA, RB RC , U = U
. 18.3.1
IA, IB IC :
.
:
I A = I AB I CA; I B = I BC I AB; I C = I CA I BC.
UA, UB, UC RA = RB = RC = R :
I = U /R; I = I Ö3.
(. 18.3.2).
SP, , SP = P + P + P..
SP = 3 ×P = 3 ×U × I.
(- -) :
SP = 3 ×U × I × cosj = Ö3 × U × I × cosj.
.18.3.2.
SQ = 3 ×U ×I ×sinj = Ö3 × U × I ×sinj.
SS = 3 ×U ×I = Ö3 × U ×I.
.
18.2.1..
I I, U, P SP.
(RA = RB = RC = 1 ) (. 18.3.3). ( ) .
. 18.3.3
. 18.3.1 .
18.3.1
, | IA | ||
IB | |||
IC | |||
, | IAB | ||
IBC | |||
ICA | |||
, | UA | ||
UB | |||
UC | |||
, | PA | ||
PB | |||
PC | |||
, | SP |
(RA = 1 , RB= 680 , RC = 330 ).
. 18.3.4 .
. 18.3.4.
.
1.
2.
|
|
3.
4.
5.
6. ,
18.4. 17.
1. 18, . .
2. 18.3.3
3. RA = RB = RC = 1 , 18.3.3
4. . 18.3.1 .
5. (RA = 1 , RB= 680 , RC = 330 ).
6. 4.
7. , .
8. .
9. , , , .