TY - GEN
T1 - Electrical strength reduction of porcelain suspension insulators on AC transmission lines
AU - Rawat, A.
AU - Gorur, R. S.
PY - 2008/12/1
Y1 - 2008/12/1
N2 - Porcelain suspension insulators that were in service for up to 38 years on 115-500 kV ac transmission lines were evaluated for residual electrical strength. It was seen that the reduction in electrical strength or aging, was significant for some insulators causing them to puncture. The reasons for the reduction in electrical breakdown strength were investigated using scanning electron microscopy and x-ray diffraction. The marked reduction in electrical breakdown strength with time has been correlated with large number and size of defects in the porcelain microstructure. It has been shown that local field enhancement created by these defects is sufficient to initiate progressive dielectric breakdown that ultimately leads to puncture.
AB - Porcelain suspension insulators that were in service for up to 38 years on 115-500 kV ac transmission lines were evaluated for residual electrical strength. It was seen that the reduction in electrical strength or aging, was significant for some insulators causing them to puncture. The reasons for the reduction in electrical breakdown strength were investigated using scanning electron microscopy and x-ray diffraction. The marked reduction in electrical breakdown strength with time has been correlated with large number and size of defects in the porcelain microstructure. It has been shown that local field enhancement created by these defects is sufficient to initiate progressive dielectric breakdown that ultimately leads to puncture.
UR - http://www.scopus.com/inward/record.url?scp=65949094354&partnerID=8YFLogxK
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U2 - 10.1109/CEIDP.2008.4772841
DO - 10.1109/CEIDP.2008.4772841
M3 - Conference contribution
AN - SCOPUS:65949094354
SN - 9781424425495
T3 - Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
SP - 245
EP - 248
BT - 2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2008
T2 - 2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2008
Y2 - 26 October 2008 through 29 October 2008
ER -