:
- . ;
I ([6] .1);
- [II]
([5] .2);
tht = 8,4 º ([6] .1);
zht = 236 ([6] .1);
text = 40º ([6] .1);
([5] .1);
55%;
tint = + 18º
int = 8,7 /2.
aext = 23 /2.
.
.5.1.1. .
5.1.1
/ | , /3 | δ, | ,/(췰) | R, 2/ | |
0,09 | 2,04 | 0,044 | |||
200 | 0,029 | /λ | |||
0,06 | 2,04 | 0,029 |
1). Dd = (tint tht)zht, Dd - - .
Dd = (tint tht)zht = (18-(-8,4)) 236 = 6230,4ºѷ.
2). Rreq= aDd+b, Rreq - .
=0,0002
b=1,0
Rreq = aDd+b = 6230,4 0,0002 + 1 = 2,246 2/.
3). R0r = R0 r
R0 = Rreq/r, R0r - ;
R0 - ;
Rreq - ;
r - ;
r = 0,7.
R0 = Rreq/r = 2,246/0,7=3,212 /
R0 = Rsi + Rk + Rse
Rk= R0 (Rsi + Rse)
Rsi = 1/ int
Rse= 1/ aext
Rk= R0 (1/ int + 1/ aext) = 3,21 (1/8,7 + 1/23) = 3,05 2 /
4). Rk=R1+R+R3, Rk - ;
R - ;
R1,R3, - 1,3 ;
R =Rk (R1+R3)
R =Rk (R1+R3) = 3,05 (0,044+0,029) = 2,977 2 /
5). δ = R , δ -
δ = R = 0,029 2,977 = 0,0863
δ =100 .
R =δ / =0,1/0,029=3,448 2 /
: δ = (90+100+60) = 250
δ=250 .
1). .
R = Rsi + R1+R +R3+ Rse
R = Rsi + R1+R +R3+ Rse= 1/8,7 + 0,044 + 0,1/0,029 + 0,029 + 1/23 =3,68 2/.
R = 3,68 2/ > Rreq = 2,246 2/ .
2). - .
:
∆t = (tint text)/ R aint = (18 (-40))/3,68 8,7 = 1,81 º.
∆ t n = 4
∆ t = 1,81 < ∆ t n = 4º .
|
|
τsi p > td:
τsi = tint [n (tint text)/(R aint)] = 18 [1(18 (-40))/3,68 8,7] = 16,2º.
t int = 18 º =55% t d = 8,2 º τsi =16,2 º > td = 8,2 .
. .