Short circuit calculation is book you must readFull description
Hand CalculationFull description
short circuitFull description
Full description
Descripción completa
Full description
Calculation for Short Circuit Current Calculation using IEC / IEEE Standard. This report contains the description for calculating the short circuit current using IEEE 909 and circuit breaker…Full description
SC
Short Circuit Calculations IIEEFull description
SCDeskripsi lengkap
General Electric Handbook about short-circuit calculations
analisaDeskripsi lengkap
Full description
Full description
SPEC F125 January, 2010
Short Circuit Current Calculation Overview
The maximum short circuit current which is permitted to flow in the insulated conductor, conductor, or the metallic shielding and bonding (grounding) components, is dependent on the duration of the short circuit and the material used in the cable.
Insulated Conductors Formula The graphs on the following pages show the short circuit capability of 10 AWG to 1000 kcmil, copper and aluminum, XLPE and EPR insulated conductors for various periods of time. These graphs are in accordance with ICEA publication P-32-382. The equations are based on the assumption that the duration of the short circuit is so short that the heat generated is contained within the conductor, conductor, taking into consideration the temperature limit of the insulation. The graphs are derived from the following formula: 2
Copper Conductor [ ] Aluminum Conductor [ ] I — A I — A
Which simplify to: Copper Conductor I = 0.07195 A t Copper Conductor I = 0.06773 A t Aluminum Conductor I = 0.0470 A t Aluminum Conductor 0.044 A I= t
Where: I A t T1
= = = =
T2
=
amperes for MV-90 amperes for MV-105 amperes for MV-90 amperes for MV-105
Short circuit current (amperes) Conductor cross-sectional cross-sectional area (circular mils) Short circuit duration (seconds) Maximum normal operating temperature, temperat ure, 90°C for MV-90 or 105°C for MV-105 Maximum short circuit temperature, 250°C
Phone: 888-593-3355 www.generalcable.com
SPEC F125 January, 2010
Short Circuit Currents Allowable Short Circuit Currents For Thermoset Insulated Copper Conductors Rated For 90°C Maximum Continuous Operation 1000000
100000
s e r e p m A — t n e r r u C t i u c r i C t r o h S
10000
Curves Based on the Formula
1000
2
[ ] t = 0.0297 log [ TT ++ 234 ] 234 I A
2
10
1
I = Short Circuit Current–Amperes A = Conductor Area–Circular Mils t = Time of Short Circuit–Seconds T1 = Maximum Operating Temperature–90°C T2 = Maximum Short Circuit Temperature–250°C
100
10
8
6
4
2
1
1/0
2/0
3/0 4/0 250
350
500
750
1000
Conductor Size (AWG/kcmil) 1 Cycles 16 Cycles
2 Cycles 30 Cycles
4 Cycles 60 Cycles
8 Cycles 100 Cycles
Reference P-32-382-2007, reprinted in part with permission of ICEA. This excerpt is not intended to replace the standard in its entirety. ICEA standards are subject to periodic review and revision. Complete texts of this and all ICEA standards are available at IHS.
Phone: 888-593-3355 www.generalcable.com
SPEC F125 January, 2010
Short Circuit Currents Allowable Short Circuit Currents For Thermoset Insulated Copper Conductors Rated For 105°C Maximum Continuous Operation 1000000
100000
s e r e p m A — t n e r r u C t i u c r i C t r o h S
10000
Curves Based on the Formula
1000
2
[ ] t = 0.0297 log [ TT ++ 234 ] 234 I A
2
10
1
I = Short Circuit Current–Amperes A = Conductor Area–Circular Mils t = Time of Short Circuit–Seconds T1 = Maximum Operating Temperature–105°C T2 = Maximum Short Circuit Temperature–250°C
100
10
8
6
4
2
1
1/0
2/0
3/0 4/0 250
350
500
750 1000
Conductor Size (AWG/kcmil) 1 Cycles 16 Cycles
2 Cycles 30 Cycles
4 Cycles 60 Cycles
8 Cycles 100 Cycles
Reference P-32-382-2007, reprinted in part with permission of ICEA. This excerpt is not intended to replace the standard in its entirety. ICEA standards are subject to periodic review and revision. Complete texts of this and all ICEA standards are available at IHS.
Phone: 888-593-3355 www.generalcable.com
SPEC F125 January, 2010
Short Circuit Currents Allowable Short Circuit Currents For Thermoset Insulated Aluminum Conductors Rated For 90°C Maximum Continuous Operation 1000000
100000
s e r e p m A — t n e r r u C 10000 t i u c r i C t r o h S Curves Based on the Formula 1000 2
[ ] t = 0.0125 log [ TT ++ 228 ] 228 I A
2
10
1
I = Short Circuit Current–Amperes A = Conductor Area–Circular Mils t = Time of Short Circuit–Seconds T1 = Maximum Operating Temperature–90°C T2 = Maximum Short Circuit Temperature–250°C
100
10
8
6
4
2
1
1/0
2/0
3/0 4/0 250
350
500
750 1000
Conductor Size (AWG/kcmil) 1 Cycles 16 Cycles
2 Cycles 30 Cycles
4 Cycles 60 Cycles
8 Cycles 100 Cycles
Reference P-32-382-2007, reprinted in part with permission of ICEA. This excerpt is not intended to replace the standard in its entirety. ICEA standards are subject to periodic review and revision. Complete texts of this and all ICEA standards are available at IHS.
Phone: 888-593-3355 www.generalcable.com
SPEC F125 January, 2010
Short Circuit Currents Allowable Short Circuit Currents For Thermoset Insulated Aluminum Conductors Rated For 105°C Maximum Continuous Operation 1000000
100000
s e r e p m A — t n e r r u C 10000 t i u c r i C t r o h S Curves Based on the Formula 1000 2
[ ] t = 0.0125 log [ TT ++ 228 ] 228 I A
2
10
1
I = Short Circuit Current–Amperes A = Conductor Area–Circular Mils t = Time of Short Circuit–Seconds T1 = Maximum Operating Temperature–105°C T2 = Maximum Short Circuit Temperature–250°C
100
10
8
6
4
2
1
1/0
2/0
3/0 4/0 250
350
500
750
1000
Conductor Size (AWG/kcmil) 1 Cycles 16 Cycles
2 Cycles 30 Cycles
4 Cycles 60 Cycles
8 Cycles 100 Cycles
Reference P-32-382-2007, reprinted in part with permission of ICEA. This excerpt is not intended to replace the standard in its entirety. ICEA standards are subject to periodic review and revision. Complete texts of this and all ICEA standards are available at IHS.
