ALL ALUMINIUM CONDUCTOR (AAC) SIZING CALCULATIONS

Item Description Symbol1 Conductor type2 No. of conductor per phase n3 Conductor cross section area A

4 Conductor diameter D5

6 α

7 Ambient temperature

8 Maximum conductor operating temperature (final equilibrium temperature)

9 Maximum conductor short circuit temperature

10 Wind speed v11 Emissivity with respect to black body

12 Intensity of solar radiation

13 Solar radiation absorption coefficient g14 3 phase symmetrical short circuit current (r.m.s)

15 Rated short time

16 Duration of short circuit current

17 Specific thermal capacity c

18 Specific mass ρ

1920 System frequency f

Heat loss by convection

Conductor DC resistance at temperature 20oC Rdc

Temperature coefficient of electrical resistance of conductor at temperature 20oC

T1

T2

Tsc

Ke

Si

Ik

Tkr

Tk

Specific conductivity at 20oC k20

RT2 Electrical resistance of conductor at a temperature T2

Pconv

Heat loss by radiation of the conductor

Solar heat gain by the conductor surface

f(x) Skin effect constant

I Current rating of conductor

Total continuous current rating

Rated Short Time Withstand Current Density (r.m.s) for 1 sec

Short circuit current rating of selected conductor

Prad

Psol

Itotal

Sthr

Sth Thermal equivalent short time current density for all Tk values

Amin Minimum Conductor Cross Section at Ik & Tkr

IS

Parameter UnitAll Aluminium Conductor (A.A.C ) Stranded Hard Drawn 2800

0.0369 m3.61E-05 Ω/m

0.00403 1/°C

35 °C

85 °C

200 °C

0.5 m/s0.5

1200

0.550000 A

1 s

3 s

910

2700

3.48E+07 1/(Ωm)50 Hz

0.0000455690145 ohm/m

72.90 w/m

mm2

W/m2

J/(kgoC)

kg/m3

24.41 w/m

22.14 w/m

1.04

1,260.34 A

2,520.68 A

81.47

47.03

613.76

130.34 kA

A/mm2

A/mm2

mm2

ALL ALUMINIUM CONDUCTOR (AAC) SIZING CALCULATIONS

Item Description1 Conductor type

2 No. of conductor per phase3 Conductor cross section area

4 Conductor diameter5

6

7 Ambient temperature

8 Maximum conductor operating temperature (final equilibrium temperature)

9 Maximum conductor short circuit temperature

10 Wind speed11 Emissivity with respect to black body

12 Intensity of solar radiation

13 Solar radiation absorption coefficient14 3 phase symmetrical short circuit current (r.m.s)

15 Rated short time

16 Duration of short circuit current

17 Specific thermal capacity

18 Specific mass

1920 System frequency

Heat loss by convection

Heat loss by radiation of the conductor

Solar heat gain by the conductor surface

f(x) Skin effect constant

I Current rating of conductor

Total continuous current rating

Rated Short Time Withstand Current Density (r.m.s) for 1 sec

Conductor DC resistance at temperature 20oC

Temperature coefficient of electrical resistance of conductor at temperature 20oC

Specific conductivity at 20oC

RT2 Electrical resistance of conductor at a temperature T2

Pconv

Prad

Psol

Itotal

Sthr

Sth Thermal equivalent short time current density for all Tk values

Amin Minimum Conductor Cross Section at Ik & Tkr

Short circuit current rating of selected conductorIS

Symbol Parameter UnitAll Aluminium Conductor (A.A.C ) Stranded Hard Drawn

n 2A 600

D 0.0320 m4.77E-05 Ω/m

α 0.00403 1/°C

35 °C

85 °C

200 °C

v 0.5 m/s0.5

1200g 0.5

50000 A

1 s

3 s

c 910

ρ 2700

3.48E+07 1/(Ωm)f 50 Hz

0.000060195015 ohm/m

67.41 w/m

21.17 w/m

19.20 w/m

1.02

1,061.77 A

2,123.55 A

81.47

47.03

613.76

mm2

Rdc

T1

T2

Tsc

Ke

Si W/m2

Ik

Tkr

Tk

J/(kgoC)

kg/m3

k20

A/mm2

A/mm2

mm2

97.76 kA