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Conductor Sizing Factor (Ieee STD 80-2013)

The document provides a formula for calculating the conductor sizing factor according to IEEE Std 80-2013. The formula takes into account several variables such as the rms current, conductor cross section, maximum and ambient temperatures, thermal coefficient of resistivity, resistivity, thermal capacity, and duration of current. An example is given applying the formula with specific values for the variables.

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196 views1 page

Conductor Sizing Factor (Ieee STD 80-2013)

The document provides a formula for calculating the conductor sizing factor according to IEEE Std 80-2013. The formula takes into account several variables such as the rms current, conductor cross section, maximum and ambient temperatures, thermal coefficient of resistivity, resistivity, thermal capacity, and duration of current. An example is given applying the formula with specific values for the variables.

Uploaded by

Dada
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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CONDUCTOR SIZING FACTOR (IEEE Std 80-2013)

where * IEEE - 80 : 2013, 11.3.1, eqn. 37 Page No: 42


I is the rms current in kA
Amm2 is the conductor cross section in mm2
Tm is the maximum allowable temperature in °C
Ta is the ambient temperature in °C
αr is the thermal coefficient of resistivity at reference temperature Tr in 1/°C
ρr is the resistivity of the ground conductor at reference temperature Tr in μΩ-cm
Ko 1/αo or (1/αr) – Tr in °C
tc is the duration of current in s
TCAP is the thermal capacity per unit volume from Table 1, in J/(cm3·°C)

I Tm Ta αr ρr Ko tc TCAP Amm2 D
KA °C °C 1/°C μΩ-cm °C s J/(cm3·°C) mm2 mm
25 1084 40 0.00378 10.1 245 3 3.8 349.783 21.1088

NOTE: The above values will be


be changed
changed according
accordingto
to material
materialtype
typeshown
shownin
intable
tablebelow
belowas
asper
perIEEE
IEEE- -80
802013
2013

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