Performance of Polymeric Insulators under Accelerated Ageing under AC & DC Voltages


N. Vasudev
K. N. Ravi
P. Krishna Murthy


The performance of insulator for AC and DC voltages is of great practical importance as the insulators can be used with both types o f voltages. In view of the many advantages of composite (polymeric) insulators, extensive experimental and analytical investigations have been carried out in the present study on the ageing characteristics o f these insulators. Inclined plane tracking and erosion tests, as well as the long term ageing tests, were conducted on samples of polymeric insulator materials. It has been possible to conclude from the above experiments that positive polarity DC is more severe for polymeric material compared to negative polarity DC and AC voltages. The surface degradation of the material was diagonised by hydrophobicity measurement and leakage current analysis. Analytical techniques such as x-ray Diffraction, Energy Dispersion x-ray have been used to analyze the material deterioration. Thermo graviometric analysis and Differential scanning calorimeter tests were also used to study the filler material content in the polymer.


How to Cite
Vasudev, N., Ravi, K. N., Krishna Murthy, P., & Channakeshava. (2004). Performance of Polymeric Insulators under Accelerated Ageing under AC & DC Voltages. Power Research - A Journal of CPRI, 39–43. Retrieved from


  1. P.J. Lambeth “Rapid procedure for measuring pollution performance of HV ac and DC insulators in the laboratory”, CIGRE working group document 33-86(WG 04) 08IWG 1986.
  2. N. Vasudev, Channakeshava, Pigini etal., "Study of the performance of composite insulators in polluted conditions”, CIGRE-1994, paper 33-104.
  3. lEC 1109 1992-03 “Composite insulators for AC overhead lines with nominal voltage greater than 1000V.”

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