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Toughened glass insulator – A key component

Insulators on T/D lines have to survive extreme environmental conditions and stress levels for more than 50 years without any failure or service interruption.

During this time, they have 2 main functions to ensure:

  • Electric insulation between the conductor and the tower
  • Supporting the weight and mechanical stresses generated by the conductors

Different glass profiles

Thanks to the different glass profiles, Sediver offers solutions adapted to all applications and the most diverse environmental conditions.

Our insulators’ profiles are designed to propose a leakage distance adapted to your environment:

STANDARD PROFILE: The standard profile is characterized by a leakage distance* higher than the values indicated in the ANSI C29.2B and by well-spaced under-ribs that allow an effective self-cleaning action by wind or rain.

FOG TYPE PROFILE: The fog type profile is characterized by long and widely-spaced under-ribs so as to avoid arc bridging between adjacent ribs. It is particularly effective in coastal areas (Salt fog) as well as in polluted areas where a higher specific leakage distance is required

OPEN PROFILE: a design without under-ribs so as to avoid the accumulation of solid pollution deposits (dust, sand) on its lower surface It is particularly adapted to suspension and tension applications in dry desertic areas where wind is predominant and rain infrequent.

SPHERICAL PROFILE: The spherical shape offers a leakage distance equivalent to that of standard profile type. With a spherical profile manual cleaning is easy and effective.

OUTERIB PROFILE: This profile offers a leakage distance equivalent to the anti-pollution profile and is adapted to the most extreme cases of solid pollution

In case of extreme or exceptional pollution, it may become necessary to install a toughened glass insulator with a factory-processed RTV silicone coating which eliminates the need for regular washing, more info on our Sedicoat here.

Mechanical rating: Sediver always goes further

The total load on an insulator string results from the applied vertical, transverse and longitudinal loads.

There are different stresses that insulators must withstand:

  • Mass of Insulators
  • Mass of hardware
  • Mass of conductors
  • Wind
  • Ice
  • Wind + ice
  • Conductor tension
  • Construction 
  • Maintenance

Common practice is to limit the Maximum Load(the service load under the most severe conditions anticipated) as follows:  Maximum Load 50% of the insulator mechanical rating but at Sediver, we are going further than the ANSI or IEC standards, have a look in our catalogs (in our documents download center) for more details.

Benefits of choosing Sediver TGI for IEC or ANSI standard

  • Reinforced reliability and safety
  • High reliability along services life
  • Reduced maintenance/operating cost
  • Reinforced reliability
  • No risk of puncture
  • Complete traceability

Sediver® Toughened Glass insulators have the unique ability to resist the effects of time and the elements with no degradation of mechanical or electrical performance