Voltage drop1.pdf

CABLE SIZING AND VOLTAGE DROP CALCULATIONS OF CABLES ON POWER SKID (TYPICAL)

Abu Dhabi Company for Onshore Oil Operations (ADCO)

1 ISSUED FOR IMPLEMENTATIONREV DATE PREP CHK APPD DESCRIPTION

Client : Contractor :

Project : ARTIFICIAL LIFT OIL WELLDept :

Location : FIELD GENERAL

Project No : P0 Details: CABLE SIZING AND VOLTAGE DROP

ADCO DOCUMENT NO : 30.71.53.2401 REV : 1 CALCULATIONS OF CABLES ON

POWER SKID (TYPICAL)30.71.53.2401.1 SHEET NO.1 TOTAL SH.16 FILE NAME :

Abu Dhabi Company for Onshore Oil Operations (ADCO)

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3 References

3.1 ADCO Specification - Electrical Requirements for Packaged Equipment :

3.2 ADCO Specification - Power and Control Cables :

3.3 Datasheet for Cables :

3.4 Cable schedule for Power skid

3.5 Cable Manufacturer Catalogs, Tables & Data Sheets




Project No : P0 Details : CABLE SIZING AND VOLTAGE DROP

ADCO DOCUMENT NO : 30.71.53.2401 REV :1 CALCULATIONS OF CABLES ON POWER SKID (TYPICAL)

30.71.53.2401.1 SHEET NO. 3 TOTAL SH. 16

FILE NAME :

Saleem

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4 Datas for Calculation

4.1 Derating Factors for 6kV Cable Laid In Air(ie. In the Ladders)

4.1.1 Air Ambient Temperature = 55 oC

4.1.2. Derating factor for Air Temperature Dt = 0.76

4.1.3 Group Derating factor Dg = 1

(Only one cable is present)

4.1.4 Total derating factor Dtot = Dt*Dg

= 0.76

4.2 Derating Factors for 0.6/1kV Cable Laid In Air(ie. In the Ladders)

4.2.1 Air Ambient Temperature = 55 oC

4.2.2 Derating factor for Air Temperature Dt = 0.76

4.2.3 Group Derating factor Dg = 0.72

4.2.4 Total derating factor Dtot = Dt*Dg

= 0.5472





ADCO DOCUMENT NO : 30.71.53.2401 REV : 1 CALCULATIONS OF CABLES ON POWER SKID (TYPICAL)

30.71.53.2401.1 SHEET NO.4 TOTAL SH 16

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5 Detailed Calculations for Electrical Cable Sizing and Voltage Drop

5.1 Cable Sizing Calculation for 3.6/6(7.2)kV Cable Circuit Between 450kVA,33/3.3/0.415kV Transformer

and HV Switchgear. The 3.3kV winding has a capacity of 425kVA.

a) Full Load Current Carrying Capacity is Calculated as below

Rated Transformer Power kVA = 425 kVA

Operating voltage on the MV winding of Transformer shall vary depending on the actual connected motorrated voltage. We consider the minimum operating voltage of the trafo as per available taps.Hence we consider Transformer Primary Voltage kV = 0.901 kV

Full Load Current IL = [kVA / (SQRT(3)*kV)]

= 272.34 A

We select 150mm2 cable for our sizing calculation

6kV,1Cx150mm2 cable current rating I = 451 AAs per manufacturer catalogue in section 6.

Total derating factor as per section 4.1.4 Dtot = 0.76

6kV,1Cx150mm2 cable derated current ID = Dt * I

= 342.76 A

Number of runs required per phase N = IL / ID

= 0.795

Since this ratio is less than "1" we need only one run of 1Cx150mm 2 cable.

b) Short Circuit Current Carrying Capacity is Calculated as below

Fault MVA based on Transformer Impedance MVAF = [Rated kVA / Impedance] MVA

Rated Power of the Transformer kVA = 425 kVA

Nominal Impedance of the Transformer % = 5 %

Fault MVA based on Transformer Impedance MVAF = 8.5 MVA

Healthy Line to Line Voltage prior to Fault kVL-L = 0.901 kV

Fault Current Based on the Above MVA = [MVAF / (SQRT(3)*kVL-L)]

= 5.447 kA

As per the cable manufacturer the copper conductor can withstand a short-circuit current of 21.5 kAfor 1 sec. Please refer section 6.

Since the fault current calculated is well below the rated short circuit current,the selected cableis adequate.


Project : ARTIFICIAL LIFT OIL WELL Dept :


Project No : P0 Details CABLE SIZING AND VOLTAGE

ADCO DOCUMENT NO : 30.71.53.2401 REV : 1 DROP CALCULATIONS OF CABLES ON POWER SKID (TYPICAL)

30.71.53.2401.1 SHEET NO. 5 TOTAL SH. 16

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c) Voltage Drop Calculation

Voltage Drop Allowed as per ADCO specification = 3 %

Voltage Drop Allowed VDA = 27.03 V

Milli Voltage Drop for 1Cx150mm 2 mV = 0.3 mV/A/m

Load Current I = 272.3 A

Cable Route Length(Max.) L = 12 m

Voltage Drop Actual VDACT = (mV * I * L/1000) V

= 0.98 V

Since the Voltage Drop Actual(VDACT) is much less than the Voltage Drop Allowed(VDA) the cable size is adequate.

The cable type is CU/XLPE/AWA/PVCCopper ConductorSemiconductive conductor screenXLPE InsulationSemiconductive insulation screenCopper tape screenFillers Tape bindersGalvanized steel wire armourOuter sheath




Project No : P0 Details: CABLE SIZING AND VOLTAGE DROPADCO DOCUMENT NO : 30.71.53.2401 REV:1 CALCULATIONS OF CABLES ON

POWER SKID (TYPICAL) 30.71.53.2401.1 SHEET 6 TOTAL SH 16

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5.2 Cable Sizing Calculation for 0.6/1kV Cable Circuit Between Trafo 25kVA (415V) tertiary winding

and 415V Switchgear


Rated Transformer Power kVA = 25 kVA

Rated Transformer Secondary Voltage kV = 0.415 kV

Full Load Current IL = [kVA / (SQRT(3)*kV)]

= 34.781 A

We select 4Cx35mm2 cable for our sizing calculation

0.6/1kV,4Cx35mm2 cable tabulated current I = 162As per manufacturer catalogue in section 6.


0.6/1kV,4Cx35mm2 cable Derated current ID = Dt * I

= 88.646


= 0.392



Fault MVA based on Transformer Impedance MVAF = [Rated kVA / Impedance] MVA

Rated Power of the Transformer kVA = 25 kVA

Approx Impedance of the Transformer on 415V winding % = 1 %

Fault MVA based on Transformer Impedance MVAF = 2.50 MVA

Healthy Line to Line Voltage prior to Fault kVL-L = 0.415 kV

Fault Current Based on the Above MVA IF = [MVAF / (SQRT(3)*kVL-L)]

= 3.478 kA

As per the cable manufacturer the copper conductor can withstand a short-circuit current of 5 kA for 1 sec.Please refer section 6 for details.

Since the fault current calculated is well below the rated short circuit current,the cable size is adequate.




Project No : P0 Details : CABLE SIZING AND VOLTAGE

ADCO DOCUMENT NO : 30.71.53.2401 REV :1 DROP CALCULATIONS OF CABLES ON POWER SKID (TYPICAL)

30.71.53.2401.1 SHEET NO. 7 TOTAL SH. 16

FILE NAME :




Milli Voltage for 4Cx35mm 2 mV = 1.15 mV/A/m


Cable Route Length (Max.) L = 15 m

Voltage Drop Actual VDACT = (mV * I * L/1000)

= 0.6 V



Project :ARTIFICIAL LIFT OIL WELL Dept :



ADCO DOCUMENT NO : 30.71.53.2401 REV :1 CALCULATIONS OF CABLES ONPOWER SKID (TYPICAL)

30.71.53.2401.1 SHEET NO. 8 TOTAL SH. 16

FILE NAME :

5.3 Cable Sizing Calculation for 0.6/1.0kV Cable Circuit Between 415V Switchgear and Lighting DB


Load Current IL = 63 A

Operating Voltage kV = 0.415 kV


0.6/1.0kV,4Cx16mm 2 cable current rating I = 99 AAs per manufacturer catalogue in section 6.


0.6/1.0kV,4Cx16mm 2 cable Derated current ID = Dtot * I

= 54.173 A


= 1.163



MCCB Magnetic setting I>> A = 600 AMCCB used is Siemens 3VL2706-1EJ43-0AA0 with Ir=63A, I>> = 600A, Ti= 1.957sec

MCCB operating time for the above current s = 1.957 s

Thermal Let through energy from the MCCB I2tMCCB = (600)2 * 1.957

= 704520

Short-circuit current of cable as per manufacturer's data A = 2290 A

Short-circuit current duration of the cable s = 1 s

Thermal withstand energy of the cable I2tC = (2290)2 * 1

= 5244100

Since the Cable I2t (5244100) is well above the MCCB I2t (704520) , We conclude that the available MCCBwill protect the Cable.




Milli Voltage Drop for 4Cx16mm 2 mV = 2.5 mV/A/m

Load Current I = 63 A



= 1.733 V






ADCO DOCUMENT NO : 30.71.53.2401 REV : 1 CALCULATIONS OF CABLES ONPOWER SKID (TYPICAL)

30.71.53.2401 SHEET NO. 9 TOTAL SH. 16

FILE NAME :

5.4 Cable Sizing Calculation for 0.6/1.0kV Cable Circuit Between 415V Switchgear and UPS - Mains Supply


Max rated input power as per UPS data sheets kVA = 3 kVA


Full Load Current IL = [kVA/ kV]

Load Current IL = 4.174 A


0.6/1.0kV,4Cx4mm2 cable current rating I = 44 AAs per manufacturer catalogue in section 6.


0.6/1.0kV,4Cx4mm2 cable Derated current ID = Dtot * I

= 24.077 A


= 0.173Since this ratio is less than "1" we need only one run of 4Cx4mm 2 cable.


MCCB Magnetic setting I>> A = 320.54 AMCCB used is Siemens 3VL17 03-1EH43- 0AA0 with Ir=32A, I>> = 300A, Ti= 2.054sec



= 211040




= 324900

Since the Cable I2t (324900) is well above the MCCB I 2t (211040) , We conclude that the available MCCBwill protect the Cable.




Milli Voltage Drop for 4Cx4mm 2 mV = 10 mV/A/m




= 0.376 V






ADCO DOCUMENT NO : 30.71.53.2401 REV :1 CALCULATIONS OF CABLES ONPOWER SKID (TYPICAL)

30.71.53.2401.1 SHEET NO.10 TOTAL SH. 16

FILE NAME :

5.5 Cable Sizing Calculation for 0.6/1.0kV Cable Circuit Between 415V Switchgear and UPS Bypass Supply


Max input power in Bypass mode kVA = 3 kVA

Operating Voltage(Two phase, 2pole 415V connection) kV = 0.415 kV <B

Full Load Current IL = [kVA/kV]

Load Current IL = 7.229 A


0.6/1.0kV,4Cx4mm2 cable current rating I = 44 AAs per manufacturer catalogue in section 6.


0.6/1.0kV,4Cx4mm2 cable Derated current ID = Dtot * I

= 25.978 A


= 0.278Since this ratio is less than "1" we need only one run of 4Cx4mm 2 cable.


MCCB Magnetic setting I>> A = 350 AMCCB used is Siemens 3VL1796-1EH43-0AA0 with Ir=16A, I>> = 350A, Ti= 0.557secMCCB operating time for the above current s = 0.557 s


= 68232.5


Sh t i it t d ti f th bl 1Short-circuit current duration of the cable s = 1 s


= 324900

Since the Cable I2t (324900) is well above the MCCB I 2t (68232.5) , We conclude that the available MCCBwill protect the Cable.




Milli Voltage Drop for 2Cx4mm 2 mV = 10 mV/A/m




= 0.651 V

Since the Voltage Drop Actual(VD ACT ) is much less than the Voltage Drop Allowed(VD A ), the 4C x 4 mm 2 <Dcable size is adequate.

Since the Voltage Drop Actual(VDACT) is less than the Voltage Drop Allowed(VDA) the cable size is adequate.





ADCO DOCUMENT NO : 30.71.53.2401 REV :1 DROP CALCULATIONS OF CABLESON POWER SKID (TYPICAL)

30.71.53.2401.1 SHEET NO.11 TOTAL SH. 16

FILE NAME :

5.6 Cable Sizing Calculation for 0.6/1.0kV Cable Circuit Between 415V Swgr and PLC Panel


Load Current IL = 10 A


We select 2Cx2.5mm2 cable for our sizing calculation

0.6/1.0kV,2Cx2.5mm 2 cable current rating I = 39 AAs per manufacturer catalogue in section 6.


0.6/1.0kV,2Cx2.5mm 2 cable Derated current ID = Dtot * I

= 21.341 A


= 0.469

Since this ratio is less than "1" we need only one run of 2Cx2.5mm 2 cable.


MCCB Magnetic setting I>> A = 350 AMCCB used is Siemens 3VL1796-1EH43-0AA0 with Ir=16A, I>> = 350A, Ti= 0.557sec



= 68233



Thermal withstand energy of the cable I2t = (360)2 * 1Thermal withstand energy of the cable I2tC = (360) 1

= 129600

Since the Cable I2t (129600) is well above the MCCB I2t (68223) , We conclude that the available MCCBwill protect the Cable.




Milli Voltage Drop for 2Cx2.5mm2 mV = 19 mV/A/m

Load Current I = 10 A

Cable Route Length L = 12 m


= 2.28 V






ADCO DOCUMENT NO : 30.71.53.2401 REV : 1 DROP CALCULATIONS OF CABLES ON POWER SKID (TYPICAL)

30.71.53.2401.1 SHEET NO. 12 TOTAL SH. 16

FILE NAME :



Location :FIELD GENERAL

Project No : P0 Details : CABLE SIZING AND VOLTAGE DROPADCO DOCUMENT NO : 30.71.53.2401 REV :1 CALCULATIONS OF CABLES ON

POWER SKID (TYPICAL)30.71.53.2401.1 SHEET NO. 13 TOTAL SH. 16

FILE NAME :

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* NOTE: AS PER ACTUAL VENDOR DATA




Project No : P0 Details: CABLE SIZING AND VOLTAGE DROPADCO DOCUMENT NO : 30.71.53.2401 REV :1 CALCULATIONS OF CABLES ON

POWER SKID (TYPICAL)30.71.53.2401.1 SHEET NO.14 TOTAL SH. 16

FILE NAME :

Saleem

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Project No: P0 Details :CABLE SIZING AND VOLTAGE DROP

ADCO DOCUMENT NO : 30.71.53.2401 REV : 1 CALCULATIONS OF CABLES ON POWER SKID (TYPICAL)

30.71.53.2401.1 SHEET NO.15 TOTAL SH. 16

FILE NAME :

Saleem

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Location :FIELD GENERAL

Project No : P0 Details : CABLE SIZING AND VOLTAGE DROPADCO DOCUMENT NO : 30.71.53.2401 REV :1 CALCULATIONS OF CABLES ON

POWER SKID (TYPICAL)30.71.53.2401.1 SHEET NO.16 TOTAL SH.16

FILE NAME :

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Voltage drop1.pdf