JP TECHNOSOFT AHMEDABAD Ph:
27603538 Email:
[email protected]
DOCUMENT : NON-ISOLATED PHASE ALUMINIUM BUSBAR SYSTEM DESIGN Date:27/02/201
PROJECT :OMELECTRICAL Sheet No:1
Panel ID: TSL
Revision:R0
INPUT DATA: 1600.0 Amp.
A
=
Electrical Load (3-phase, A.C.)
=
PF
=
Operating Power Factor
=
V
=
Nominal Voltage
=
415.00 Volts
Vmin
=
Min. Continuous Operating Voltage
=
100.00 Volts
f
=
System Frequency
=
50.00 Hz
Alti
=
Altitude
=
100.00 Mtr.
Isc
=
Fault Current
=
1600.0 kA
tf
=
Duration of Fault
=
Ta
=
Ambient Temprature
=
Tf
=
Final Temprature of Busbar
=
0.80
1.00 Sec 40.00 85.00
o o o
C C
Tend
=
Allowed Final Temp. at end of fault
=
185.00
H
=
Busbar Enclosure Height
=
300.00 mm
D
=
Busbar Enclosure Depth
=
600.00 mm
BBmat
=
Busbar Material
=
AL
BBgrade
=
Grade of Busbar
=
D 50
BBil
=
Busbar Interleaving
=
Withou
BBinsul
=
Busbar Insulating Material
=
PVC
S
=
Busbar Spacing (c/c Ph-Ph)
=
130.00 mm
Sb
=
Distance Between Bus(Within Phase)
=
10.00 mm
at
=
Total Busbar width per Phase
=
30.00 mm
bt
=
Total Busbar Height per Phase
=
100.00 mm
Ssupport
=
Busbar Support Interval
=
600.00 mm
Lbb
=
Busbar Length
=
SH
=
Min. Shearing Strenght of Al.
=
1500.0 kG/cm
O<20
=
Temp. Coefficient of Resi. at 20 /
=
.00403
N
=
No. of Busbar/Phase
=
2.00
BBsize
=
Busbar size =
Panel Installation Place = Page 1/3
o
C
101.6 X 9.53 mmxmm
C
4.20 Mtr. 2
4" x 3/8" inch
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JP TECHNOSOFT AHMEDABAD Ph:
27603538 Email:
[email protected]
DOCUMENT : NON-ISOLATED PHASE ALUMINIUM BUSBAR SYSTEM DESIGN Date:27/02/201
PROJECT :OMELECTRICAL Sheet No:1
Panel ID: TSL
Revision:R0
CALCULATION : [A] MINIMUM BUSBAR AREA REQUIRED: Conductor Area Required
k*(1 + O<20 * Tf)*t =
Isc*
\
= 625.58 sqmm
0(t) * 100 -
Where, k
=
0(t)= -
Busbar Material Constant
= 1.1660
Temp. Rise of Bus at time of fault
= 100.00
o
C
[B] CURRENT CARRYING CAPACITY CALCULATION: D1
=Derating factor due to Ambient Temp.
=
0.945 (Table 28.3,Ref.1)
D2
=Derating due to Altitude
=
1.000
D3
= Derating factor for Grade of Aluminium
=
1.000 (Table 30.6,Ref.1)
D4
=Derating factor due to size of Enclosure
=
0.775 (Table 28.6,Ref.1)
D5
=Derating due Skin Effect
=
1.000
D6
=Derating factor due to Proximity Effect
=
0.990 (Table 7,Ref.2)
D7
=Derating factor due to Black Paint
=
1.000
D8
= Derating factor due to frequency variation
=
1.000
Overall Derating Factor
=
Actual Current carrying capacity of Busbars = Actual Current Density of Busbars
=
Current Carrying Capacity Margin
=
0.725 1798.127 Amp. 0.929 Amp./Sq.mm. 198.127 Amp.
[C] VOLTAGE DROP CALCULATION: Rdc(20) =
Rdc at 20 Deg. Cen.
= 29.690 Micro-Ohm/Mtr.
Rdc(Tf) =
Rdc at Final Temp. of Busbar
= .01873 Micro-Ohm/Mtr.
Rac
=
Rdc * Skin Effect ratio (Fig.28.13(a), Ref.1)
=
0.000 Micro-Ohm/kM/Ph
L
=
Busbar Inductance (Fig. 28.24, Ref. 1)
=
0.110 Micro-Ohm/kM/Ph
Vd
=
Voltage drop for Busbar
=
0.739 Volts
Yvd
=
Voltage drop for Middle Bus
=
0.000 Volts
Vdiff
=
Voltage Imbalance
=
0.309 %
[D] SHORT CIRCUIT WITHSTAND SUITABILITY: -4 2 16 * Isc * k1 * 10 Force on each Busbar Fm = S Where,
=
1745.087 KG
k1 = Space factor for rectangular busbar (Fig. 28.7, Ref. 1) S = c/c spacing between two phases Page 2/3
Developed By : www.jptechnosoft.com
JP TECHNOSOFT AHMEDABAD Ph:
27603538 Email:
[email protected]
DOCUMENT : NON-ISOLATED PHASE ALUMINIUM BUSBAR SYSTEM DESIGN Date:27/02/201
PROJECT :OMELECTRICAL Sheet No:1
Panel ID: TSL
Revision:R0
Bending stress on the Busbar at time of fault = Where,
Fm * Ssupport 12 * M * N
=
266.090
kg/sq.cm.
M = Section Modulus of each Busbar N = No. of Busbar per phase [E] TEMPERATURE AT TIME OF FAULT : 2 Temperature at the time of fault
Isc * \ t = Antilog 3.41*104 * BBarea
40.954
=
o
*(Ta+233)
C
CONCLUSION : 1. Volt. Drop in Middle Phase = 0.00 Volt 2. Busbar Support Interval Is Suitable 3. Busbar Ampere Capacity Is Suitable 4. Remark:
Busbar Configuration:
References: (1) "Electrical Power Engineering, Reference & Applications Handbook" - by Mr. K C Agarwal (2) "Aluminium Busbar - A comprehensive Handbook" - By Thomas & Rata Page 3/3
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