660 , 50 60 440 . : /. (1 , 2 ); (1 IP 40, 2− IP 54); (2 ); (); (); ( 2 3). 3.2, 3.3.
4.2−
f =50 | U , | ||||
I , | |||||
U , | |||||
I , | 0,3 | 0,6 | 1,6 | 2,0 |
4.3−
112/1 212/1 | 112/2 212/2 | 112/3 212/3 | 122/1 222/1 | 122/2 222/2 | 122/3 222/3 | |
. | I40 | I54 |
4.1. ( 4.1) . V =3,5 3, ρ=180 /3. D= 0, 65 . k= 12 . q=300, h=0,85, U =380 .
. :
F =0,8p D 2/4=0,8×3,14×0,652/4=0,265 2.
0,8 .
4.4 −
q 0 | |||||
0,068 | 0,108 | 0,156 | 0,204 | 0,254 |
, k =12,
v = kV /60 F =12×3,5/60×0,265=2,64 /.
(/)
n=60v/ p Da, (4.1)
− , q 4.4.
4.4 , q=300 = 0,108,
n =60×2,64/3,14×0,65×0,108=719 /.
, ,
P = D 5 n 3r×10-8= 0,108×0,655×7193×180×10-8=8,38 .
(k =1,15)
= kP /h=1,15×8,38/0,85=11,34 .
, 3.1. =11 U =380 4.5 .
|
|
4.5 −
, | , | |||||
5,5 | 18,3 | |||||
18,5 | ||||||
3,7 | ||||||
(2). , , 4.1, 220 , 4.1 22402 . : 25 , 220 , (), , 87 ×, IP40, − 1 , 1 .
I S= / U =87/220=0,4 ,
− , U .
U =220 I S=0,4 4.2, 4.3 ( SB1, SB2) 212/2 : U =220 , I =5 , 2 (, ), IP40.
4.2. Q= 216 3/ =35 , n= 1450 /, η=75%, η=95%. U =380 .
. ()
= k QH rg×10-3/(3600×hh), (4.2)
k − (k =1,1−1,5, , 5 ), Q− , 3/, − , , r− , /3, g =9,81 /2 − , η− , η− .
k =1,3. , − (r=1000 /3),
=1,3×216×35×1000×9,81×10-3/(3600×0,75×0,85)=37,6 .
, 4.1. =37 U =380 4.5 . (5). , , 4.1, 220 4.1 52402 . : 125 , 220 , (), , 500 ×, IP40, − 1 , 1 .
|
|
I S= / U =500/220=2,27 ,
− , U .
U =220 I S=2,27 4.2, 4.3 ( SB1, SB2) 212/2 : U =220 , I =5 , 2 (, ), IP40.