Drive Cable Sizing Calculation

DRIVE CABLE SIZING CALCULATION

J H G F E D C B A 0

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18.08.2011 New Calculations

Rev.

DATE

Approved by SRR Checked by HSY

MODIFICATIONS

Client

SK

Project ROLLER PRESS-1 Department

Num:

SK

HSY

SRR

Written

Check.

Approv.

MARAT, SAUDI Line:

CEMENT MILL Plan:

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Site: CITY CEMENT

Written by

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Process Stage ROLLER PRESS

Line 1

DRIVE CABLE SIZING CALCULATIONS

3BYN4611003-SAC

Form. A4

Indice 0

Folio Last Folio

1 4

CITY CEMENT ROLLER PRESS-1

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 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

4

Min. cross section required for Cable to withstand short circuit withstand capacity of the system = Where,

5

K Ik t -

Material Constant of the Conductor with insulation (=143 for Cu.XLPE cable) Short circuit withstand capcity of the system Duration of Short circuit withstand capacity of the system

=

√(

(Icont2 x Tcont) + (Imax2 x Tmax) Tcont + Tmax

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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

Current (IRMS) calculation is given by IRMS Where,

6

Icont Tcont Imax Tmax

)

Steady state voltage drop for the cable connecting the Loads from MCC is given

3x I x L x (RcosF + XsinF) x 100 n x V x 1000

Percentage voltage drop =

Where,

L R X

Cos F Sin F I

n V 7

Ik t K

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Cable length (estimated) Max. in meter Conductor resistance /Km per run Conductor Reactance /Km per run Power factor of the system

1-cos2F Full load current No of runs of cable System Voltage

Maximum Length of Cable upto which the voltage drop is less than the specified value (i.e 3%) is given by

Doc.No.:3BYN4611003-SAA Rev. No. A

Page 2 of 12

Prep.by:PA-CP/HSY Appr.by:PA-CP/SRR

CITY CEMENT ROLLER PRESS-1

Max. Length of Cable

Where,

Doc.No.:3BYN4611003-SAA Rev. No. A

%V

=

n x V x (%V) x1000 3x I x (RcosF + XsinF) x 100

-

Maximum percentage voltage permissible (3%)

Page 3 of 12

Prep.by:PA-CP/HSY Appr.by:PA-CP/SRR

Drive Cable Sizing Current in Amps S.No

Drive Description

Motor kW Drive rating

1 2 3

Roller Press Motor-1 VFD (552RP1M01) Roller Press Motor-2 VFD (552RP1M02) Recirculation Fan VFD (552FN3M01)

Duration in Secs

Supply Voltage

IRMS ICont

Imax

Purpose

TCont Tmax 690V Motor

Derating Factor = 0.623 Derated Current Cable current carrying Selected carrying capacity capacity

No.of Round Runs off Remarks

1200

ACS-800-07-2320-7

690

1810

2370

540

60

1873.5474

Power

3C x 300

480

299.04

6.265

7

1200

ACS-800-07-2320-7

690

1810

2370

540

60

1873.5474

Power

3C x 300

480

299.04

6.265

7

900

ACS-800-07-1500-7

690

911

1366.5

585

15

925.12487

Power

3C x 240

426

265.398

3.486

4

Cu XLPE Armoured Cable Cu XLPE Armoured Cable Cu XLPE Armoured Cable

440V Motor 4 5

Seperator Fan VFD (552SR2M01) Bagfilter Fan VFD (552FN4M01)

200

ACS-800-07-0260-5

440

310

465

585

15

314.80649

Power

3C x 240

426

265.398

1.186

2

75

ACS-800-07-0100-5

440

124

186

585

15

125.9226

Power

3C x 95

240

149.52

0.842

1

Cu XLPE Armoured Cable Cu XLPE Armoured Cable