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Silicone Station Post Insulator

A station post insulator is a high-strength electrical insulation component designed to support and isolate live conductors in substations and high-voltage power line structures. Engineered for mechanical stability and dielectric reliability, it withstands extreme electrical stress, environmental exposure, and heavy structural loads. Its rigid, solid-core design ensures long-term performance in switching stations, busbar systems, transformer yards, and high-voltage equipment interfaces.

Key Features

  • High dielectric strength for reliable insulation under elevated voltage levels.
  • Solid-core porcelain or polymer construction for superior mechanical stability.
  • Excellent contamination resistance through glazed or hydrophobic surfaces.
  • High cantilever and torsional strength to support heavy conductors and equipment loads.
  • Weather- and UV-resistant material suited for harsh outdoor environments.
  • Low partial discharge performance for enhanced system reliability.
  • Corrosion-resistant hardware fittings ensuring long service life.

Product Details

General

ApplicationStation Post
Cantilever Bending Strength – Routine1517
Fitting – Ground/Base5″ B.C. Tapped
Fitting – Live Line End5″ B.C. Tapped
MaterialSilicone
Material – End FittingGalvanized Steel
Number of Sheds31
Shed StyleAlternating
Tensile StrengthStandard Strength
Tensile Strength – Routine30000 lb
Torsional Strength9000

Dimensions

Diameter – Large Shed7.3
Diameter – Small Shed6.1
Length – Effective54 in (1371.6 mm)
Rod Diameter2.5
Weight51 lb (23.13 kg)

Electrical Ratings

BIL650 kV
Creep and Leakage Distance145 in (3700 mm)
Voltage – Line138 kV
Withstand Voltage – 60 Hz Wet280
kV Class138 kV

Certifications and Compliance

Industry Standard(s)ANSI TR 288

Resources and Downloads

SpecificationsDownload PDF
Technical DrawingsDownload PDF