Performance of distribution-class surge arresters under dry and artificial pollution conditions |
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Authors: | I A Metwally |
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Affiliation: | 1.Department of Electrical and Computer Engineering, College of Engineering,Sultan Qaboos University,Muscat,Sultanate of Oman |
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Abstract: | This paper presents an experimental investigation of distribution-class surge arrester (SA) performance under dry, clean-fog
and salt-fog conditions. Two SA rated 11 kV and three SA rated 33 kV were tested inside a salt-fog chamber to investigate
how the internal active material (either zinc oxide/metal oxide “ZnO” or silicon carbide “SiC”) and the arrester housing material
affect the overall performance under different pollution severities. Tests were conducted on SiC porcelain-, ZnO polymeric-
and ZnO silicone rubber- (SiR) housed SA. Both the internal and the external currents were measured for each SA up to its
maximum continuous operating voltage (MCOV). Results reveal that new ZnO SiR-housed SA shows its superior performance under
salt-fog condition over the other two types tested. On the other hand, aged ZnO SiR-housed SA can have high external current
close to that of SiC porcelain-housed SA. New ZnO polymeric-housed SA gives the highest rms external and internal currents
under salt-fog condition as its housing material is hydrophobic in nature and has the shortest creepage distance. |
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