A review of artificial contamination withstand test methods of high voltage outdoor insulators (original) (raw)

In this paper several important test methods for At the same time, there is no universally accepted standard artificially polluted ceramic and nouseramic insulators have APT pollution test) method for composite been reviewed. There is no standard test for noo-ceramic insulators, niS may be due to the fact that several factors insulators. The research has shown that it is necessary to in to play assessing the long performance modify the standard 5000h salt fog test to evaluate the of composite insulators. Current questions are:r when a long-term performance of non-ceramic insulators. composite insulator ages in a polluted environment do its Although the main parameter for Selection of Proper properties change from those which characterized the units ceramic and glass insulators is the amount of pollution, it perfomance , , , , der contaminated conditions when it was Seems to be n-sa=Y to Consider other envh~nmental new, how do changes in hydrophobicity affect the relation factors for selection of composite insulators. These are between results on new insulators and field average humidity, W radiation level, wind velocity, rain of aged fall. and dominant Woe of wetting. This is necessaw ..-CERAMIC 8 GLASS INSULATORS because research has shown that they directly effect the performance.nf nonseramic insulators. For the frst step, Table 2 shows the main standard tests of ceramic and glass contaminated insulators. Because of time over which ceramic insulators have been in use, the APT introduced by IEC (based on much research and field