Current carrying capacity for copper and aluminum barFull description
Bus Bar differential protection
Full description
Full description
DESIGN OF 132kV MAIN BUS SUMMARY
1.Design Parameter Design maximum Current Fault Current, Symmetrical Minimum size recommended
= Isc
Metric 20 00 A
= =
25 k A 100.00 mm
= = = = =
102.00 mm 90.52 mm 5.74 mm 1735.95 mm2 201.78 cm4 39.56 cm3
=
23 44 A
British
2.Section Property Outer diameter Inner diameter Thickness of wall Area of Cross-section Moment of Inertia Section Modulus
=
4.000 in 3.564 in 0.226 in 2.59 sq.in
3.Electrical Design Current Capacity
4.Deflection Check Self Weight of Bus Bar Wind pressure Lateral Load due to wind on Bus Lateral Load due to wind on Insulator Unsupported span of Bus Bar Assumed Deflection
L
= = = = = =
5.215 kg/m 75.00 kg/m2 7.65 kg/m 15.00 kg/m 1040 cm 3.75 cm
51.11 N/m 735 N/m2 74.97 N/m2 147 N/m2
BUS SIZES PROPOSED FOR DAMAK SUBSTATION Description 1 132kV Main Bus 2 33kV Main Bus 3 Interconnecting Branch Bus
Aluminum Bus size OD ID Thickness 102 90.52 5.74 4 3.56 0.226 102 90.52 5.74 4 3.56 0.226 76 69.03 2 2.88 2.72 0.079
mm inch mm inch mm inch
Refer Calculation
Refer Calculation Refer Calculation
Refer Calculation
73.03 mm 69.03 mm 2.00 mm
2.875 in 2.718 in 0.079 in
DESIGN OF 33kV MAIN BUS SUMMARY
1.Design Parameter Design maximum Current Fault Current, Symmetrical
= =
Isc
Metric 2000 A 25 kA
British
2.Section Property Outer diameter Inner diameter Thickness of wall Area of Cross-section Moment of Inertia Section Modulus
= = = = =
102.00 mm 90.52 mm 5.74 mm 1735.95 mm2 201.78 cm4 39.56 cm3
=
2344 A
=
4.000 in 3.564 in 0.226 in 2.59 sq.in
3.Electrical Design Current Capacity
4.Deflection Check Self Weight of Bus Bar Wind pressure Lateral Load due to wind on Bus Lateral Load due to wind on Insulator Unsupported span of Bus Bar Assumed Deflection
L
= = = = = =
5.215 kg/m 75.00 kg/m2 7.65 kg/m 15.00 kg/m 1040 cm 2.50 cm
51.11 N/m 735 N/m2 74.97 N/m2 147 N/m2
73.03 59 7.01
57.03
Refer Calculation
Refer Calculation Refer Calculation
Refer Calculation
2.65 lb/ft 1.2 kg/ft 3.94
DESIGN OF 33kV MAIN BUS SUMMARY
1.Design Parameter Design maximum Current Fault Current, Symmetrical
= =
Isc
Metric 2000 A 25 kA
British
2.Section Property Outer diameter Inner diameter Thickness of wall Area of Cross-section Moment of Inertia Section Modulus
= = = = =
76.00 mm 62.00 mm 7.00 mm 1517.39 mm2 91.23 cm4 24.01 cm3
=
2052 A
=
2.992 in 2.441 in 0.276 in 2.35 sq.in
3.Electrical Design Current Capacity
4.Deflection Check Self Weight of Bus Bar Wind pressure Lateral Load due to wind on Bus Lateral Load due to wind on Insulator Unsupported span of Bus Bar Assumed Deflection
L
= = = = = =
3.943 kg/m 75.00 kg/m2 5.70 kg/m 11.25 kg/m 500 cm 2.50 cm
38.64 N/m 735.00 N/m2 55.86 N/m2 110.25 N/m2
73.03 59 7.01
57.03
Refer Calculation
Refer Calculation Refer Calculation
Refer Calculation
2.65 lb/ft 1.2 kg/ft 3.94
DESIGN OF BRANCH BUS SUMMARY
1.Design Parameter Design maximum Current Fault Current
= Isc
=
800 A 25 kA
2.Section Property Outer diameter Inner diameter Thickness of wall Area of Cross-section Moment of Inertia Section Modulus
= = = = = =
73.03 mm 69.03 mm 2.00 mm 446.26 mm2 28.16 cm4 7.71 cm3
2.875 in 2.718 in 0.079 in 0.69 sq.in
3.Electrical Design Current Capacity
=
1097 A
4.Fiber Stress Check Self Weight of Bus Bar Wind pressure Lateral Load due to wind on Bus Lateral Load due to wind on Insulator Unsupported span of Bus Bar Assumed Deflection
L
= = = = = =
2.152 kg/m 75.00 kg/m2 5.48 kg/m 11.25 kg/m 500 cm 2.50 cm
21.09 N/m 735.00 N/m2 53.67 N/m2 110.25 N/m2
5.16
Refer Calculation
Refer Calculation Refer Calculation
Refer Calculation
DESIGN OF 33kV BRANCH BUS 1.Design Parameter Design maximum Current Imax
Fault Current
=
800
=
25
2.Section Property WP/T6 (Range 2) Section Designation Outer diameter Inner diameter Thickness of wall Area of Cross-section Moment of Inertia Section Modulus Minimum Tensile Strength
3.Electrical Design Conductivity = Current Capacity = Current Capacity > Design Current, Hence section is
1.63 941
4.Fiber Stress Check Self Weight of Bus Bar Unsupported span of Bus Bar Force Due to Short Circuit;
L
= =
1.561 300
2 -2 F = 2.04*is *L/r*10 kgf
is= Imax*SQRT(2)*1.8
= r= Spacing of bus = Hence F = Moment due to self weight Mw = Moment due to Short Circuit Msc = Fibre Stress due to selfweight Sw = Fibre Stress due to Short Circuit Ssc = Resultant Fiber Stress Sr = Resultant Fiber Stress < Tensile Strength, Hence section is
63.64 150 165.24 1.8 123.93 0.28 20.11 20.11
A kA
mm mm mm mm2 mm4 mm3 kg/mm2
A/mm2 A OK
kg/m cm
kA cm kgf kg-m kg-m kg/mm2 kg/mm2 kg/mm2 OK
Busbar Design Chandranigahapur System Reinforcement Project
DESIGN OF 33kV MAIN BUS (Rev-1) 1.Design Parameter Design maximum Current Imax
Fault Current
=
2000
=
25
2.Section Property WP/T6 (Range 2) Section Designation Outer diameter Inner diameter Thickness of wall Area of Cross-section Moment of Inertia Section Modulus Minimum Tensile Strength
3.Electrical Design Conductivity = Current Capacity = Current Capacity > Design Current, Hence section is
1.44 2007
4.Deflection Check Self Weight of Bus Bar = Wind pressure = Lateral Load due to wind = Unsupported span of Bus Bar L = Refer Annex-B for Deflection Calculation Calculated Deflection = Calculated Deflection < Outer Diameter, Hence section is
3.762 75.00 5.72 500 5.00
5.Fiber Stress Check Force Due to Short Circuit; 2 -2 F = 2.04*is *L/r*10 kgf is= Imax*SQRT(2)*1.8
= r= Spacing of bus = Hence F = Moment due to self weight Mw = Moment due to Short Circuit Msc = Fibre Stress due to selfweight Sw = Fibre Stress due to Short Circuit Ssc = Resultant Fiber Stress Sr = Resultant Fiber Stress < Tensile Strength, Hence section is
63.64 150 275.4 11.8 344.25 0.52 15.31 15.32
Busbar Design Chandranigahapur System Reinforcement Project
