Polymer line post insulators

Polymer line post insulators are designed for insulating and securing bare and insulated conductors of overhead power lines (OPL) and distribution devices (DD) of power plants and substations with alternating current voltages of 10–35 kV and frequencies up to 100 Hz. They are intended for operation at ambient temperatures from -60 °C to +50 °C at altitudes up to 1000 m above sea level in areas with pollution degrees from 1 to 4.

The insulator's construction includes a fiberglass rod providing mechanical strength and a protective sheath made of silicone rubber, which shields the rod from atmospheric effects and increases the leakage path length. Metal end fittings ensure the connection of the insulator with conductors and OPL support elements.

Insulators are classified by the following parameters:

  • Design type: line post insulator (OLSK).
  • Protective coating material: silicone rubber (K).
  • Nominal voltage: 10, 20, or 35 kV.
  • Normalized bending breaking strength: 12.5 or 16 kN.
  • End fitting modification: determined by the method of conductor attachment to the end fitting (e.g., A).
  • Stud diameter and length: e.g., M24 and 50 mm.
  • Pollution degree: 2, 3, or 4 according to PUE, 7th edition, ch. 1.9; STO 56947007-29.240.068-2011.
  • Climatic design: UHL, placement category 1 according to GOST 15150.

Example of designation: OLSK 12.5/20-A24-50-4 UHL 1 TU 27.90.12.110-034-21639232-2016, where:

  • OLSK — line post insulator with a protective sheath made of silicone rubber.
  • 12.5 — normalized bending breaking strength in kN.
  • 20 — nominal voltage in kV.
  • A24-50 — end fitting modification with M24 thread and 50 mm stud length.
  • 4 — pollution degree.
  • UHL 1 — climatic design UHL, placement category 1.
  • TU 27.90.12.110-034-21639232-2016 — technical specifications.
Submit
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.