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Porcelain Insulators | Suspension Insulators

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Zinc Sleeve

Contaminated and wet insulators display a biased leakage current having DC component. This DC component causes electrolytic corrosion and reduction of pin diameter.

Pin Corrosion of suspension (disc) insulator

  • Resultant reduction of mechanical strength
  • Breakage of ceramic body due to expansion of pin

NGK developed Zinc Sleeve to prevent pin corrosion.

  • Galvanically positive
  • Large potential difference from iron
  • Sacrificial electrode at cement boundary
  • Bonded area of sleeve: Min. 80% of sleeve/pin interfacial area to prevent corona discharges
  • Purity of zinc >- 99.8% to prevent granular corrosion

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