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software for aluminium busbar sizing - thomas and rata
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DOCUMENT : NON-ISOLATED PHASE ALUMINIUM BUSBAR SYSTEM DESIGN Date:27/02/201
JP TECHNOSOFTAHMEDABAD
27603538Ph: [email protected]:
Grade of Busbar D 50
415.00
100.00
INPUT DATA:
PROJECT :OMELECTRICAL
Altitude
Duration of Fault
40.00
AL
1.00
85.00
Sec
Fault Current 1600.0 kA
Busbar size
Busbar Enclosure Depth
185.00
100.00
300.00
Indoor with ventilated
101.6 X 9.53
600.00
Mtr.
V = =Nominal Voltage Volts
Min. Continuous Operating Voltage = VoltsVmin =
System Frequency =f =
Total Busbar width per Phase =
bt
=
Total Busbar Height per Phase ==
Busbar Interleaving
==
No. of Busbar/Phase =N =
Busbar Insulating Material ==
Ambient Temprature
Final Temprature of Busbar
=
=
=
=
30.00
100.00
600.00
2.00
PVC
Allowed Final Temp. at end of fault =
=Busbar Material
Busbar Enclosure Height =
=
=
=
=
=
=
=
=
Ta
Tf
Tend
BBmat
H
mm=D
= =
Alti = =
Panel Installation Place =
=
== Withou
Busbar Spacing (c/c Ph-Ph) = 130.00
Distance Between Bus(Within Phase) = 10.00
Ssupport Busbar Support Interval
Busbar Length =Lbb = 4.20
Min. Shearing Strenght of Al. =SH =2
kG/cm2
kG/cm2
kG/cm2
kG/cm2
kG/cm2
kG/cm2
kG/cm1500.0
50.00
Sheet No:1 Revision:R0
S =
Sb =
Page 1/3 Developed By : www.jptechnosoft.com
Isc
tf
=BBsize
at
Temp. Coefficient of Resi. at 20 / == .00403
Hz
mm
mmxmm
mm
mm
mm
mm
mm
Mtr.
O<20
BBgrade
BBinsul
BBil
1600.0A = =Electrical Load (3-phase, A.C.) Amp.
0.80PF = =Operating Power Factor
Panel ID:TSL
oC
oC
oC
oC
4" x 3/8" inch
DOCUMENT : NON-ISOLATED PHASE ALUMINIUM BUSBAR SYSTEM DESIGN Date:27/02/201
JP TECHNOSOFTAHMEDABAD
27603538Ph: [email protected]:
CALCULATION :
\k*(1 + * Tf)*tO<20
(t) * 100Conductor AreaRequired = sqmm625.58=
Derating factor for Grade of Aluminium 1.000D3 = =
PROJECT :OMELECTRICAL
Derating due to Altitude
0.945D1 = =Derating factor due to Ambient Temp.
1.000D2 = =
Page 2/3 Developed By : www.jptechnosoft.com
[A] MINIMUM BUSBAR AREA REQUIRED:
Isc*
[B] CURRENT CARRYING CAPACITY CALCULATION:
Derating factor due to size of Enclosure 0.775D4 = =
Derating factor due to Proximity Effect 0.990D6 = =
Derating due Skin Effect 1.000D5 = =
Derating factor due to Black Paint 1.000D7 = =
Derating factor due to frequency variation 1.000D8 = =
Overall Derating Factor 0.725=
Actual Current carrying capacity of Busbars 1798.127= Amp.
Actual Current Density of Busbars 0.929= Amp./Sq.mm.
29.690Rdc(20) = =Rdc at 20 Deg. Cen.
[C] VOLTAGE DROP CALCULATION:
Micro-Ohm/Mtr.
.01873Rdc(Tf) = =Rdc at Final Temp. of Busbar Micro-Ohm/Mtr.
0.000Rac = = Micro-Ohm/kM/Ph
0.110L = =Busbar Inductance (Fig. 28.24, Ref. 1) Micro-Ohm/kM/Ph
Vd = Voltage drop for Busbar 0.739= Volts
Yvd = Voltage drop for Middle Bus 0.000= Volts
0.309=
(Table 28.3,Ref.1)
(Table 30.6,Ref.1)
(Table 28.6,Ref.1)
(Table 7,Ref.2)
0-
%Vdiff = Voltage Imbalance
Temp. Rise of Bus at time of fault=0-(t)
Busbar Material Constant=k
= 100.00oC
= 1.1660
[D] SHORT CIRCUIT WITHSTAND SUITABILITY:
Force on each Busbar Fm = 1745.087 KG=16 * Isc * k1 * 10
S
2 -4
Where,
k1 = Space factor for rectangular busbar (Fig. 28.7, Ref. 1)
S = c/c spacing between two phases
Sheet No:1 Revision:R0Panel ID:TSL
Current Carrying Capacity Margin 198.127= Amp.
Rdc * Skin Effect ratio
Where,
(Fig.28.13(a), Ref.1)
DOCUMENT : NON-ISOLATED PHASE ALUMINIUM BUSBAR SYSTEM DESIGN Date:27/02/201
JP TECHNOSOFTAHMEDABAD
27603538Ph: [email protected]:
Remark:
PROJECT :OMELECTRICAL
Temperature at the time of fault
40.954
=
=
Isc * t\3.41*10 * BBarea4
Page 3/3
kg/sq.cm.
Bending stress on the Busbar at time of fault =
266.090=
Developed By : www.jptechnosoft.com
Fm * Ssupport
12 * M * N
Where,
M = Section Modulus of each Busbar
N = No. of Busbar per phase
Antilog
2
*(Ta+233)
References:
(1) "Electrical Power Engineering, Reference & Applications Handbook"- by Mr. K C Agarwal
(2) "Aluminium Busbar - A comprehensive Handbook" - By Thomas & Rata
Busbar Configuration:
oC
Sheet No:1 Revision:R0Panel ID:TSL
CONCLUSION :Volt. Drop in Middle Phase = 0.00 Volt1.
Busbar Support Interval Is Suitable2.
Busbar Ampere Capacity Is Suitable3.
4.
[E] TEMPERATURE AT TIME OF FAULT :