Differences ANSI/IEEE and IEC altitude Correction Factors

[miltonboss]

Hello, dear friends

Could you help me whats is differente between ANSI/IEEE and IEC on altitudes Correction Factors ...?
what is a good option to aply on high altitude site, where the dielectric strength is less?
any opinion , information will help..!!

thx
mc

 

[arrehman1]

Is this for transmission line thermal limits?

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[dpc]

It's going to depend on the type of equipment you are interested in. There is not a single ANSI altitude correction factor.

 

[miltonboss]

The idea is how many of INSULATOR use in power line at high altitude side.
what is the best options up 2000 m ? which standart or other literature coul herlp me to choose the insulator with the better performance at this side?

 

[scottf]

If you're referring to strike distance correction or BIL de-rating for altitude...

I've always understood IEC to be +1% for every 100m over 1000m. IEEE basically follows the same up to 3000m (I think). Above 3000m it changes slightly.

 

[cuky2000]

The dielectric altitude correction factor per IEC Standard for m=0.90 and the IEEE Std C37-20 is virtually the same.

See the enclosed graph for comparison purposes.