WAN Xiaodong, YAO Tao, LI Jin, et al. Study on Snow Flash Characteristics Under Horizontal Arrangement of DC Composite Bushing[J]. 2025, 45(4): 27-31. DOI: 10.3969/j.issn.1008-0198.2025.04.005.
Study on Snow Flash Characteristics Under Horizontal Arrangement of DC Composite Bushing
After the DC composite through-wall bushing in the converter station is covered with snow
flashover may occur
causing power outages. This article presents a horizontal arrangement of contaminated composite hollow bushing in a large artificial climate laboratory
and conducts snow-covering flashover tests under direct current voltage. The results show that 50% withstand voltoage (U
50
) obtained by using a non-charged snow melting pressurization method is about 6.8% lower than U
50
obtained by using a charged snow melting pressurization method. The U
50
under the DC voltage of the snow-covered bushing decreases with the increase of salt density
but its characteristic index α is lower than the index obtained
from the pollution test. When the salt density is 0.1mg/cm
2
the U
50
gradient under the horizontal arrangement of the snow-covering composite bushing is close to that under weak hydrophobicity of the contaminated bushing.
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