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This is method to calculate the Ampacity of the Cable
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TUGASTEKNOLOGITRAFO&KABELNAMA:GamaTitisAnuragaNIM: 23214061
1sirkitkabelXLPEterdiridari16kabeldipasangdidalamsebuatconcreteduckyangtertanam.HitungAmpicity-nya?Adapundata-datanyasebagaiberikut:
DATAKABEL&DUCT:
A 760 mm2 LuasconcreatestrandedkonduktorRac 32.3 10
6 /m ACResistanceconductor
dc 36 mm Diameterkonduktordins 76 mm Diameterisolasidjacket 90 mm DiameterpembungkusODduct 133.3 mm DiameterluarductIDduct 130 mm DiameterdalamductTc 80
0C TemperaturmaksimumisolasiTa 25
0C TemperaturambienSIC 2.3 Konstantadielektrikisolasi(berdasarkanNeher-Mcgrath)TAN 0.001 Faktordissipasiisolasi(berdasarkanNeher-Mcgrath)
DATAINSTALASI:
BURIAL 850 mm Kedalamandaripermukaantanahkecentrekonduktordphase 250 mm Jarakantarakonduktordcircuit 250 mm Jarakantarasirkitkabelsatusamalainnyaf 50 Hz FrekuensisistemE
150000
3 V Tegangansistem
n 1 JumlahkonduktorperductN 16 Jumlahduct
RESISTIVITASTERMAL
ins 4 C0-m/w Resistivitastermalisolasinative 1.2 C0-m/w Resistivitastermaltanahjacket 7 C0-m/w Resistivitastermaljacketduct 4.8 C0-m/w Resistivitastermal ibreductbackfill 0.85 C0-m/w Resistivitastermalconcreatewcbf 250 mm Lebarconcreate
1
hcbf 3734 mm Tinggiconcreatex wcbf 250 mmy hcbf 3.734 10
3 mm
JAWAB
STEP1-HITUNGRUGI-RUGIDIELEKTRIK
DIELECTRIC LOSS
W
2 f SICE
3
2 TAN 10 9
18 lndinsdc
0.134 W/m
STEP2-HITUNGRTHERMALSEMUALAPISAN
RThermalIsolasi:
Riins2
lndinsdc
0.476
RThermalJacket:
Rjjacket
2
lndjacket
dins
0.188
RThermalduct:Rduct
duct2
ln
ODductIDduct
0.019
Faktorkoreksigeometris:
Db e
1
2
x
y
4
x
y
ln 1y2
x2
ln x( )
253.891
Lb BURIAL dphase 1.1 103
Gb ln2 Lb 4 Lb
2 Db2
Db
2.849
HitungdiameterDx:an 6.71
104
native 100 0.8 1.457 103 Thermaldiffusivityofsoil
2
Dx 1.03 an 24 192.589
RThermaltanah:L BURIAL dphase 1.1 10
3 Kabelfasatengahmemilikitahanantermistertinggi
Rearthbackfill
2 ln
DxODduct
ln2 L 4 L2 ODduct
2
Dx
0.473
RThermalkoreksi:
Rcorrectionnative backfill
2 n N Gb 2.539
MutualHeating:
F2 BURIAL dphase
dphase
2 BURIAL 3 dphase dphase
76.44
Tahananthermalmutual:Rmutual
backfill2
ln F( ) N 1( ) nnative backfill
2 Gb
2.967
STEP3-HITUNGKENAIKANTEMPERATURDIKARENAKANPEMANASANDIELEKTRIK
Td W12
Ri Rduct Rearth Rcorrection Rmutual
0.838 0C
STEP4-HITUNGAMPACITY
RacRthermal Rac Ri Rac Rduct Rac Rearth Rac Rcorrection Rac Rmutual 2.091 104
Tcond Tc Td Ta 54.1620C
IratedTcond
RacRthermal508.92 Amp
GAMBARINSTALASI:
3
1100 mm
3.734 mm
4
250 mm
5
6
7
8