Hello to all,
In the IEEE 141 chapter 4.5.2 (collect and convert impedance data).
For calculations of maximum short-circuit currents, the IEEE 141 recommend to use a "Hot" or rated load resistance values for these calculations. Now, for the short-circuit calculations at reduced temperature here is the IEEE suggestion:
"For industrial plant office buildings, and for other facilities with largely non-motor loads, full load
might be applied without delay at start-up and calculations should account for pre-start-up
temperatures of components and their resistances. For a low-voltage short circuit at the end of
a feeder from a substation to a non-motor load, where the resistance of the feeder circuit is
significant in determining short-circuit current magnitude, it may be appropriate to assume a
no-load feeder conductor temperature and resistance to calculate a maximum current."
What IEEE means by "no-load-feeder conductor temperature"?
Thanks,
Nick
In the IEEE 141 chapter 4.5.2 (collect and convert impedance data).
For calculations of maximum short-circuit currents, the IEEE 141 recommend to use a "Hot" or rated load resistance values for these calculations. Now, for the short-circuit calculations at reduced temperature here is the IEEE suggestion:
"For industrial plant office buildings, and for other facilities with largely non-motor loads, full load
might be applied without delay at start-up and calculations should account for pre-start-up
temperatures of components and their resistances. For a low-voltage short circuit at the end of
a feeder from a substation to a non-motor load, where the resistance of the feeder circuit is
significant in determining short-circuit current magnitude, it may be appropriate to assume a
no-load feeder conductor temperature and resistance to calculate a maximum current."
What IEEE means by "no-load-feeder conductor temperature"?
Thanks,
Nick