drive cable sizing calculation
DESCRIPTION
cable sizing calculationTRANSCRIPT
DRIVE CABLE SIZING CALCULATION
J - - - - -H - - - - -G - - - - -F - - - - -E - - - - -D - - - - -C - - - - -B A0 18.08.2011 New Calculations SK HSY SRR
Rev. DATE MODIFICATIONS Written Check. Approv.
Approved by Client Site:
SRRCITY CEMENT
MARAT, SAUDIProjectChecked by ROLLER PRESS-1
HSYDepartment Line: Process Stage
CEMENT MILLLine 1 ROLLER PRESS
Written by
SKPlan:
DRIVE CABLE SIZING CALCULATIONS
Num: 3BYN4611003-SACForm. Indice Folio 1
A4 0 Last Folio 4
CITY CEMENTROLLER PRESS-1
Doc.No.:3BYN4611003-SAARev. No. A
Page 2 of 12 Prep.by:PA-CP/HSYAppr.by:PA-CP/SRR
Note:
1 The Cable requirement calculations were carried out based on the Latest Feeder/ Load list furnished by LNVT
2 Length of cables are tentively considered as per the Layout
3 Derating factor considered for the cable
4 Min. cross section required for Cable to withstand short circuit withstand capacity of the system =
KWhere, K - Material Constant of the Conductor with insulation (=143 for Cu.XLPE cable)
- Short circuit withstand capcity of the systemt - Duration of Short circuit withstand capacity of the system
5
√( )Where, - Continous current that flows through the cable
- Duration of flow of continous current in the scale of 600sec- Maximum current that flows through the cable- Duration of flow of maximum current in the scale of 600sec
6 Steady state voltage drop for the cable connecting the Loads from MCC is given
Percentage voltage drop =n x V x 1000
Where, L - Cable length (estimated) Max. in meterR - Conductor resistance /Km per runX - Conductor Reactance /Km per run
- Power factor of the system
-I - Full load current
n - No of runs of cableV - System Voltage
Net Derating factor = Derating factor due to change in Amb.Temp (50oC) x Derating factor for method of cable laying
Net Derating factor = 0.82 x 0.76 = 0.623
I k Ö t
Ik
Current (IRMS) calculation is given by
IRMS = (Icont2 x Tcont) + (Imax
2 x Tmax)Tcont + Tmax
Icont
Tcont
Imax
Tmax
Ö3x I x L x (RcosF + XsinF) x 100
Cos FSin F Ö1-cos2F
CITY CEMENTROLLER PRESS-1
Doc.No.:3BYN4611003-SAARev. No. A
Page 3 of 12 Prep.by:PA-CP/HSYAppr.by:PA-CP/SRR
7 Maximum Length of Cable upto which the voltage drop is less than the specified value (i.e 3%) is given by
Max. Length of Cable = n x V x (%V) x1000
Where, %V - Maximum percentage voltage permissible (3%)
Ö3x I x (RcosF + XsinF) x 100
Drive Cable SizingDerating Factor = 0.623
S.No Drive Description Motor kW
Current in Amps Duration in Secs
Purpose
RemarksDrive rating690V Motor
1 1200 ACS-800-07-2320-7 690 1810 2370 540 60 1873.5474 Power 3C x 300 480 299.04 6.265 7
2 1200 ACS-800-07-2320-7 690 1810 2370 540 60 1873.5474 Power 3C x 300 480 299.04 6.265 7
3 900 ACS-800-07-1500-7 690 911 1366.5 585 15 925.12487 Power 3C x 240 426 265.398 3.486 4
440V Motor
4 200 ACS-800-07-0260-5 440 310 465 585 15 314.80649 Power 3C x 240 426 265.398 1.186 2
5 75 ACS-800-07-0100-5 440 124 186 585 15 125.9226 Power 3C x 95 240 149.52 0.842 1
Supply Voltage
IRMSCable
Selected
Current carrying capacity
Derated current carrying capacity
No.of Runs
Round off
ICont Imax TCont Tmax
Roller Press Motor-1 VFD (552RP1M01)
Cu XLPE Armoured Cable
Roller Press Motor-2 VFD (552RP1M02)
Cu XLPE Armoured Cable
Recirculation Fan VFD(552FN3M01)
Cu XLPE Armoured Cable
Seperator Fan VFD(552SR2M01)
Cu XLPE Armoured Cable
Bagfilter Fan VFD(552FN4M01)
Cu XLPE Armoured Cable