A comparison between the atmospheric correction factors used in IEC and ANSI applied to tests performed on post insulators

Abstract

The IEC had revised its Standard nwrber 60.1 -High Voltage Testing Techniques -and published it in 1989. One of the innovations is t h e use of the new approach of a d s p h e r i c correction f a c t o r s described by P i g h i and Feser. The ANSI had also revised its Standard C 29.1 -Test Methods f o r Electrical Power Insulators -and continued t o use t h e atmospheric correction f a c t o r s described on the same Standard f r a n 1982. This report s m r i z e s a comparision of the r e s u l t s of d i e l e c t r i c tests ( l i g h t n i n g impulse, switching iupulse and power frequency tests). performed on 2 meters post i n s u l a t o r s , corrected t o standardized a d s p h e r i c conditions according t o IEC with the same r e s u l t s corrected according ANSI. The large range of hlrmidities had permited t o make a good comparision between t h e two Standards, p r i n c i p a l l y a t high values of absolute humidities ( 15 g/m').