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Educating Electrician

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Submitted By dorfd
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Hansens fabrik

http://www.kellpo.dk/Files/billeder/Billeder/Maskinbygning/Billede-073.jpg

Mathias Spanner

Indholdsfortegnelse

Hovedstrømsskema side 3

Nøgleskema side 4

Klemmelisteside 5

Anlægsbeskrivelseside 6

Oversigtstegning side 6

Enstregstegningside 7

Dimensioneringside 7

Spændingsfald side 8

Ik maksimumside 9

Ik minimumside 10

Varmetab side 11

Anlægsbeskrivelse

Trykker man på start knappen(s3), så trækker Q1 – tænder motor1 og indikerings-/driftslampe 1 lyser. K1 får signal og 10 sek. efter trækker den Q2, K2, Q3 og Q4 der starter motor2 som stjerne/trekant start. Når motor2 kører lyser indikerings-/driftslampe 2. Ved tryk på stop kontakten(s2) stopper begge motorer, og ved tryk på nødstop lukker al strømmen i selve styretavlen. Hvis termorelæet på Q1/ Q4 får termisk udkobling lyser indikeringslampe 3/4

Oversigtstegning

Enstregstegning

Dimensionering

S1 14,3+10=24,3A samtidighedsfaktor på 0,7 = 24,3*0,7 = 17,01A = 25A sikring.
17,01A≤25A≤36A ~ 6mm2

S2: 14,3A≤ 16A≤21A ~ 2,5mm2
BG = 14,3/21 = 68%

S3: 6,2A≤15,2A ~ 1,5mm2
Kb ((K*S/I)² = ((115*1,5)/140,11)² = 1,52 sek. Tid sikring = 0,11 sek 1,52>0.11 sek OK !

S4: 6,2A≤10,4A ~ 0,75mm2
(43c)Kb 0,75 ~ 20A≥16A OK !

S5: 3,6A≤15,2A ~ 1,5mm2
Kb ((K*S/I)² = ((115*1,5)/140,11)² = 1,52 sek. Tid sikring = 0,11 sek 1,52≥0.11 sek OK !

S6: 3,6A≤10,4A ~ 0,75mm2
(43c)Kb 0,75 ~ 20A≥16A OK !

S7: 10A≤15A ~ 1,5mm2
BG 10/15 = 66%

S8: 10A<15A ~ 1,5mm2
BG 10/15 = 66%

Spændingsfald

ΔUS1 = (24,3*0,0175*20*√3/6) = 2,45V i% 2,45*100/400 = 0,61%

ΔUS2 = (14,3*0,0175*25*√3/2,5) = 4,33V i% 4,33*100/400 = 1,08%

ΔUS3 = (6,2*0,0175*10*2/1,5) = 1,45 i% 1,45*100/230 = 0,36%

ΔUS4 = (6,2*0,0175*1*2/0,75) = 0,3V i% 0,3*100/400 = 0,075%

ΔUS5 = (3,6*0,0175*10*√3/1,5) = 0,73V i% 0,73*100/230 = 0,18%

ΔUS6 = (3,6*0,0175*1*√3/0,75) = 0,15V i% 0,15*100/400 = 0,04%

ΔUS7 = (10*0,0175*30*2/1,5) = 7V i% 7*100/230 = 3,04%

ΔUS8 = (10*0,0175*35*2/1,5) = 8,16V i% 8,16*100/230 = 3,5%

Jeg har lagt 1,5 kvadrat kabel på lys og edb gruppen, da vi ikke går ud fra at den vil blive fuldt belastet. For at reducere spændingsfaldet skulle man givet vis have lagt 2,5mm2.

NyΔUS7 = (10*0,0175*30*2/2,5) = 2,1V i% 2,1*100/230 = 0,91%

NyΔUS8 = (10*0,0175*35*2/2,5) = 2,45V i% 2,45*100/230 = 1,06%

Ik maksimum

Ik maksimum ved hovedtavle er oplyst til 6 kA og cosφ er 0,5.

Zf = 230/6000 = 38,3 mΩ

Rf = Zf * cosφ = 38,3*0,5 = 19,15 mΩ

Xf = Zf * sin(cosφ ˉ¹( 0,5)) = 33,17 mΩ

RS1 = R/m * L = 3,08 * 20 = 61,6 mΩ

XS1 = 0,1*20 = 2 mΩ

ZS1 = √ (Rf+RS1)² + (Xf+XS1)² = √(19,15+61,6)² + (33,17+2)² = 88,08 mΩ

RS2 = 12.10*30 = 363 mΩ

XS2 = 0,128*30 = 3,84 mΩ

ZS2 = √ (19.15+61,6+363)² + (33,17+2+3,84)² = 335,46 mΩ

Ik maksimum ved gruppetavle

230/ZS1 = 230/88,08 = 2,61126 KA = 2611,26 A

IK minimum

Ik min ved hovedtavle er oplyst til 500 A

Rf = 230/500 = 460 mΩ

RS1 = 3,08*20*2*1,5 = 184,8 mΩ

RS2 = 7,41*25*2*15 = 555,75 mΩ

RS3 = 12,1*10*2*1,5 = 363 mΩ

RS4 = 26*1*2*1,5 = 78 mΩ

RS5 = 12,1*10*2*1,5= 363 mΩ

Rs6 = 26*1*2*1,5 = 78 mΩ

Total ved motor 1 = Rf+RS1+RS2+RS3+RS4 = 460+184,8+ 555,75+363+58,5 = 1641,55 mΩ

Ik minimum ved motor1+2 = 230/1641,55 = 0,14011 KA = 140,11 A

Total ved gruppetavle = Rf+RS1+RS2 = 460+184,8 = 644,8 mΩ

Ik minimum ved gruppetavle = 230/644,8 = 0,3567 KA = 356,7 A

Varmetab i gruppetavle

HPFI = 12,8w

HPFI = 12,8w

3P+N = 7,6w

3P+N = 7,6w

1P+N = 1,8w

Ur = 2w

automatsikring 1P+N = 2,8w

total 47,4w * 1,15 = 54,51w * 0,8² = 34,89w ≤ 35w ok!

Hvis det havde været en UG12 måtte varmetabet maks være 30w derfor er der valgt en UG18.

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