String Insulator
String Insulator Mechanical Test
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This test combines both mechanical and electrical stresses to assess the integrity of a porcelain disc insulator.


  • Insulator energized up to 60 kV AC
  • Mechanical stress applied while energized
  • Mechanical loading applied until rated strength is reached
  • Mechanical loading can also be increased until mechanical failure
  • Mechanical load levels are recorded for electrical and mechanical failure