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Pin-Type Glass Insulators (ShST UD Type)

ShST 20UD

The ShST 20UD pin-type glass insulators are designed for securing and insulating SIP-3 type conductors on overhead power lines and in distribution devices of power plants and substations of alternating current with voltages from 1 to 20 kV inclusive and frequencies up to 100 Hz, operating in ambient temperatures ranging from -60 to +50 °C. The insulators are manufactured according to TU 3493-010-99267582-2015 and comply with GOST 1232.

Technical Specifications:

  • Nominal voltage: 20 kV
  • Insulator diameter: 216 mm
  • Nominal height of the insulator: 214 mm
  • Rated mechanical bending strength: 13.0 kN
  • Nominal creepage distance: at least 420 mm
  • Withstand voltage of standard lightning impulse: 125 kV
  • Withstand voltage at 50 Hz (dry conditions): 73 kV
  • Withstand voltage at 50 Hz (wet conditions): 50 kV
  • Power frequency flashover voltage in insulating medium: at least 140 kV
  • Permissible pollution level according to GOST 9920 at 6–10 kV: IV
  • Permissible pollution level according to GOST 9920 at 20 kV: II
  • Weight: 3.66 kg