Polymer support insulators of type OSK 8-220 are designed for insulating and securing current-carrying parts in electrical apparatuses and distribution devices of power plants and substations operating with alternating current at 220 kV and frequencies up to 100 Hz. They provide reliable insulation within an ambient temperature range from -60 °C to +50 °C. The climatic version and placement category comply with UHL1 according to GOST 15150. The insulators are manufactured according to TU 3494-024-82442590-2015 and conform to GOST R 52082.

Key Technical Specifications:

• Rated Voltage: 220 kV
• Rated Ultimate Bending Strength: 8 kN
• Rated Ultimate Torsional Moment: 2.0 kN·m
• Construction Height: from 2100 mm to 2300 mm, depending on the model
• Rib Diameter: 170 mm
• Insulation Height: from 1820 mm to 2020 mm
• Creepage Distance: from 5700 mm to 6300 mm
• Withstand Voltage of Lightning Impulse: from 950 kV to 1050 kV
• Withstand Voltage at 50 Hz in Dry Conditions: from 440 kV to 550 kV
• Withstand Voltage at 50 Hz under Rain: from 440 kV to 550 kV
• Discharge Voltage at 50 Hz in Polluted and Humid Conditions: not less than 220 kV
• Rated Specific Surface Conductivity of Pollution Layer: from 10 µS to 20 µS
• Permissible Pollution Degree according to GOST 9920: from II to III, depending on the model

Mounting Dimensions:

• Upper and Lower Flanges: diameter ranges from 127 mm to 194 mm; the number and size of holes vary depending on the model

These insulators are essential components in ensuring the safety and reliability of electrical systems operating at 220 kV, providing effective insulation and mechanical support under various environmental conditions.