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April 23, 2013IEEE Transactions on Power Delivery

Influences of Electric-Field Distribution Along the String on the Aging of Composite Insulators

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Authors

YTYouping TuHZHui ZhangZXZhuo Xu

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Overview

Experimental study reveals nonuniform electric-field distribution accelerates surface degradation in composite insulators, indicating electrical stress drives uneven shed aging along transmission...

Key Points

  • Investigate how nonuniform electric-field distribution contributes to the uneven degradation of composite insulator sheds along high-voltage transmission strings.
  • Analyzed sheds from two 110-kV composite insulators with different operational durations from active transmission lines.
  • Conducted hydrophobicity testing and thermally stimulated current (TSC) analyses across various axial shed positions.
  • Combined material diagnostic measurements with numerical electric-field simulations and accelerated electrical aging experiments.
  • Higher electric-field strength correlated directly with deteriorated surface hydrophobicity on composite insulator sheds.
  • Elevated electric-field intensity increased the accumulation of trapped electrical charge within the shed material.
  • Nonuniform electric-field distribution was identified as the primary mechanism causing asymmetric aging along the insulator string.

Cite This Study

Tu et al. (2013) studied this question.

synapsesocial.com/papers/6a8d5b280db1783955dcd6e4https://doi.org/10.1109/tpwrd.2013.2244103
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