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Insulators stop the flow of electricity. They prevent energized equipment from touching or arcing onto non-energized equipment, while also providing physical support for busbars, cables, and conductors. Often made of porcelain with steel fixings and cement binding, insulators are sturdy—yet still vulnerable to certain threats.

Failure modes

  • Extreme temperatures (high temperatures can damage porcelain and cause structural cracks)

  • Flashover (lightening strikes, switching surges)

  • Glazing defects (threatens insulation integrity)  


Reliability considerations

  • Partial discharge (PD) monitoring

  • IR scanning

  • Visual checks for damage

  • Physical checks such as tapping and ring tests (when appropriate)

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