Checking different weather cases on Primary & Neutral of same circuit - OH line design in PLSCAD
Checking different weather cases on Primary & Neutral of same circuit - OH line design in PLSCAD
(OP)
Hi all,
I've been working on designing a new 3-phase OH distribution line and going through NESC book to find what are the different weather cases to check for on OH primary and neutral conductors.
I recently found that if primary and neutral being used are different conductors, then the top one has to be checked for worst case condition (in most cases - max operating condition which is 120F temp) and the bottom conductor has to be checked for ambient temps (usually 60F) so that we can see if the clearances are being maintained. But does anyone know if we need to check for 120F on top conductor and NESC Rule 250C (Extreme wind case) on bottom conductor - because in most cases this would drive to worst case scenario where it is hard to maintain clearances in such conditions.
Also, is that case actually possible in real world? which if not, I do not see any point in checking for that combination of weather case.
Thanks everyone,
I've been working on designing a new 3-phase OH distribution line and going through NESC book to find what are the different weather cases to check for on OH primary and neutral conductors.
I recently found that if primary and neutral being used are different conductors, then the top one has to be checked for worst case condition (in most cases - max operating condition which is 120F temp) and the bottom conductor has to be checked for ambient temps (usually 60F) so that we can see if the clearances are being maintained. But does anyone know if we need to check for 120F on top conductor and NESC Rule 250C (Extreme wind case) on bottom conductor - because in most cases this would drive to worst case scenario where it is hard to maintain clearances in such conditions.
Also, is that case actually possible in real world? which if not, I do not see any point in checking for that combination of weather case.
Thanks everyone,






RE: Checking different weather cases on Primary & Neutral of same circuit - OH line design in PLSCAD
RE: Checking different weather cases on Primary & Neutral of same circuit - OH line design in PLSCAD
Take a look at figure 233-2.
RE: Checking different weather cases on Primary & Neutral of same circuit - OH line design in PLSCAD
Thanks,