What type of wall bushing is used for a 10kV busbar

For a 10kV busbar, an epoxy resin through-wall bushing (also called a medium-voltage wall bushing) is typically used.

Recommended Bushing Type

For 10kV busbars, epoxy resin wall bushings are widely used in indoor switchgear and substation applications. These bushings provide electrical insulation, mechanical support, and reliable separation between the busbar and grounded partitions or walls ( ). They are designed to handle medium-voltage systems, typically rated for 12kV, which covers 10kV operating voltage with sufficient safety margin ( ).

Key Features

• Material: Epoxy resin manufactured via APG (Automatic Pressure Gelation) technology ensures a void-free internal structure, high mechanical strength, and excellent dielectric performance ( ).
• Voltage Rating: Rated for systems up to 12kV, with a Basic Insulation Level (BIL) typically around 75kV, providing protection against lightning and switching surges ( ).
• Mechanical Support: Designed to withstand bending loads and securely hold copper or aluminum busbars through walls or partitions ( ).
• Partial Discharge Control: High-quality epoxy bushings maintain low partial discharge (<5pC), ensuring long-term reliability ( ).
• Installation: Available in rectangular flange (air-insulated) or cone interface (gas-insulated) configurations, suitable for KYN28 or GIS switchgear panels ( ).

Advantages Over Other Materials

Compared to traditional porcelain bushings, epoxy resin bushings are lighter, mechanically stronger, and free from internal air voids, which reduces the risk of partial discharge and improves assembly tolerances ( ). They are also resistant to moisture, heat, and chemicals, making them suitable for indoor and controlled environments ( ).

Application Notes

• Indoor Use: Standard epoxy bushings are designed for indoor switchgear with ambient temperatures from -10°C to +40°C and altitudes up to 1000m ( ).
• Shielding: For higher currents or voltages above 10kV, shielded bushings with internal capacitive screens may be used to evenly distribute the electric field and prevent flashover ( ).
• Compliance: These bushings comply with IEC 60137 standards for insulated bushings, ensuring proper dielectric strength and thermal stability ( ). In summary, for a 10kV busbar, a medium-voltage epoxy resin through-wall bushing is the standard choice, offering reliable insulation, mechanical support, and compliance with international standards for safe and long-term operation.