( 5) 5 , , 4 ( e).
I :
: I6 + I8 I2 = 0
b: I6 + I1 + I7 = 0
: I7 + I5 = J
d: I2 + I4 = J
5 |
II , , .
II :
1: RI6 + RI1 RI8 = E1
2K: RI7 + 2RI5 RI1 = E1
3K: RI8 RI4 = E2
4K: 2RI5 UJ + RI4 = 0
6 |
MathCAD ( 7):
7 |
MathCad:
I1 =2.222 A,
I2 = 2.848 A,
UJ= 17.935 ,
I4= - 2.248 A,
I5= - 0.526 A,
I6= 2.296 A,
I7= 0.074 A,
I8= 0.552 A.
3
8:
8 |
9:
9 |
:
R
E E2
3.1
10
10 |
:
I11 = J
I22 (R6+R+R) I33R = RJ + E2 + E1 E
I22R + I33 (R+R+2R) = 2RJ E1
MathCAD ( 11):
A:= B:= |
11 |
I11 = 0.6 A
I22 = 2.296 A
I33 = 0.074 A
:
I6 = I22 = 2.296
I7 = I33 = 0.074 A
I5 = I33 J = 0.074 0.6 = 0.526 A
I1 = I22 I33 = 2.296 0.074 = 2.222 A
I = - I22 + J = 0.6 2.296 = 1.696 A
II :
UJ = E +IR 2RI5 = 21 1.696 7.5 + 2 15 0.526 = -17.94
, .
3.2
12:
12 |
:
φ = 0
:
Y1=Y7=1/R
Y6=1/R6
Y5=1/2R
Y=1/R
:
φ1 (Y7 + Y1 + Y6) φ2 Y1 - φ3Y6 = -E1Y1 +E2Y6
- φ1 Y1 + φ2 (Y1 + Y5 + Y) - φ3 Y = E1Y1 + EY
- φ1 Y6 - φ2 Y + φ3 (Y+ Y6) = - EY + J E2Y6
:
I1= (φ1 - φ2 + E1) Y1
I5= - φ2 Y5
I6= (φ3 φ1 + E2) Y6
I7= φ1 Y7
I= (φ3 φ2 + E) Y
MathCAD ( 13):
13 |
:
I1 =2.222 A,
I5= - 0.526 A,
I6= 2.296 A,
|
|
I7= 0.074 A,
I= - 1.696 A.
, , .
3.3
P=I62R+ I12R+ I2R+ I522R+ I72R =2.2962 15 +2.2222 15 +1.6962 7.5 + 0.5262 30 + 0.0742 15 = 156.73
P = I6E2 + IE + I1E1 + JUJ = 2.296 42 - 1.696 21 +2.222 48 0.6 17.935
= 156.71
:
σP=(| P P |/ P) 100% = 100% = 0.01%
3.4
:
UJ = UJ(E1) + UJ(E2) + UJ(E) + UJ(J)
1. 2 14:
14 |
15:
15 |
UJ(E2) = - I5R5 - IR
R57 =R5 + R7=30 + 15 = 45
R6 =R6 + R=10 + 7.5 = 17.5
I= = 42 / 28.75 = 1.461
I5= = 21.9 / 60 = 0.365 A
UJ(E2) = - (1.461 7.5 +0.365 30) = 10.96 10.95 = 21.91
2. 1 16:
16 |
17 |
UJ(E1) = I5R5 - IR
R57 =R5 + R7=30 + 15 = 45
R6 =R6 + R=10 + 7.5 = 17.5
I1= = 48 / 27.5 = 1.739
I5= = 30.43 / 62.5 = 0.486 A
I= = 78.25 / 62.5 = 1.252 A
UJ(E2) = 0.486 30 - 1.252 7.5 =14.58 9.39 = 5.2
3. 18:
18 |
19 |
UJ(E) = - I5R5 - IR
R57 =R5 + R7=30 + 15 = 45
R6 =R6 + R=10 + 7.5 = 17.5
I= = 21 / 28.75 = 0.73
I5= = 10.95 / 60 = 0.1825 A
UJ(E2) = - (0.1825 30 +0.73 7.5) = 5.075 5.075 = 10.1
4. 20:
20 |
21 |
:
:
UJ = UJ(E1) + UJ(E2) + UJ(E) + UJ(J) = -21.9+5.2-10.1+8.8= - 18
:
σU= = 100% = 0.3%
3.5