Sixing of ACSR Over Head Conductor
Sixing of ACSR Over Head Conductor
(OP)
For any conductor the sizing can be done using formula S=IxSqrt(t)/k. Where I is Short Circuit Current, k is current density, t is time and S is cross section area.
Is there any way to get k values for ACSR conductors. My intention is to derive a thumb rule to calculate size of over head line.
Help needed.
Is there any way to get k values for ACSR conductors. My intention is to derive a thumb rule to calculate size of over head line.
Help needed.






RE: Sixing of ACSR Over Head Conductor
RE: Sixing of ACSR Over Head Conductor
Good on ya,
Goober Dave
RE: Sixing of ACSR Over Head Conductor
RE: Sixing of ACSR Over Head Conductor
For ACSR conductor a value of K=0.0862 may be used
Where:
I = curren (amperes)
S = cross sectional area of conductor (cmil)
t = clearing time(sec) for t up to 1 sec.
This is based considering a melting temperature for aluminum of 645 degress C and assuming the steel (1084C)of the ACSR will be not significantly affected since most current will be carried by the aluminum outer conductor.
The procedure outline on the IEEE Std 738 could be used for calculating the ACSR conductor sizing for steady state current.
RE: Sixing of ACSR Over Head Conductor
There are devices, like fault tamers, that can limit fault currents.
But in general, main lines should not have problems like this (I guess you can fix them if they do).
I've also seen this problem on tie's that are rarely used. No one thought to fix them over the years, and because they were rarely used, no problems were seen.
This is the tradeoff between low impedance-low loss Stepdown transformers, and higher impedance/higher loss stepdown transformers. It just seems to cost something somewere.