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A Comparative Study of Abnormal Heating Composite Insulators.

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Summary
This summary is machine-generated.

This study investigates abnormal heating in composite insulators, identifying causes like aging and defects. Optimal infrared inspection for transmission lines requires sunny, windless conditions to avoid environmental interference.

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Area of Science:

  • Electrical Engineering
  • Materials Science

Background:

  • Abnormal heating in composite insulators poses risks to power grid stability.
  • Undifferentiated replacement of faulty insulators leads to resource waste.

Purpose of the Study:

  • To analyze composite insulator heating under varying humidity and wind speeds.
  • To differentiate causes of abnormal heating for targeted maintenance.

Main Methods:

  • Observation of heating and discharge in composite insulators.
  • Analysis of heating range, shape, and temperature rise (ΔT).
  • Investigation under diverse environmental humidity and wind speed conditions.

Main Results:

  • Sheath-aging insulator heating linked to silicone rubber aging and humidity.
  • Decay-like insulator heating originates from core rod defects and partial discharge.
  • Contaminated insulator heating correlates with humidity and salt density.
  • All abnormal heating types show increased ΔT and heating range with higher humidity.
  • Low humidity heating distinguishes decay-like/contaminated from sheath-aging insulators.

Conclusions:

  • Environmental factors significantly influence composite insulator heating.
  • Targeted diagnosis based on heating characteristics improves maintenance efficiency.
  • Infrared inspections are most reliable in sunny, windless weather to avoid humidity and wind effects.