, Z a = Z b = Z c, .. Ra = Rb = Rc = R Xa = Xb = Xc = X,
Ia = Ib = Ic = I = U / Z, φa = φb = φc = φ = arctg (X/R).
φ ≠ 0 φ = 0 ( )
: İa + İb + İc = 0. , IN = 0, .
.
, Za ≠ Zb ≠ Zc φa ≠ φb ≠ φc
İa = Úa / Za; İb = Úb / Zb; İc = Úc / Zc.
İN
İN = İa + İb + İc.
Ua = UA; Ub = UB; Uc = UC, U = U / √3, ZN = 0.
, .
, , . , , .
, :
- ;
- √3 .
, .
.
- ;
- x, y, z;
- 1, 2, 3. 0;
- V;
- .
1.
2. , . 1.
1
IA | IB | IC | I0 | UA | UB | UC | UAB | UBC | UAC | |
|
|
3. . 1.
4. . 1.
5. (4 ).
6. .
______________________________________________________
.
- ?
_____________________ ______________
- ?
____________________________
_______
__________ ___________ (_________________)
17. 17 .
:
.
.
1. (UA; UB; UC).
2. (IA; IB; IC).
3. ( ).
4. (IN) .
5. (P).
6. 2.
.
1. = 1760 .
2 » = 2200
3. UAB = UBC = UCA = U = 380 .
4. , cos φ = 1.
5. ѻ () 1 .
1
; |
.
: = 1760 ; = 2200 ; PC = 2640 ; U = 380 ; cos φ = 1.
.
UA = UB = UC = U = U/√3 = 380 / (√3) = 220
.
cos φ = 1, P = U I.
I = P / U = 1760 / 220 = 8 ;
IB = PB / U = 2200 / 220 = 10 ;
IC = PC / U = 2640 / 220 = 12 .