TG1A-40.5-(450) 40.5kV Wall Bushing Technical Description The TG1A-40.5-(450) 40.5kV Wall Bushing is a high-voltage electrical component designed for safe and reliable power transmission through walls or enclosures in substations, switchgear, or transformer applications. Rated for 40.5kV system voltage, this bushing ensures insulation and mechanical stability while facilitating connections between indoor and outdoor electrical systems. Design and Construction The bushing features a robust design with a porcelain or composite insulator to provide excellent dielectric strength and resistance to environmental factors such as moisture, UV radiation, and pollution. The insulator is mounted on a flange, which allows secure fixation to walls or panels. The internal conductive core, typically made of copper or aluminum, ensures low resistance and high current-carrying capacity. The 450mm creepage distance (as indicated in the model number) enhances insulation performance, minimizing the risk of surface flashovers in contaminated or humid conditions. The bushing is designed to withstand power frequency and impulse voltages as per IEC or ANSI standards, ensuring compliance with international safety regulations. Electrical and Mechanical Specifications - Rated Voltage: 40.5kV - Rated Current: Varies based on design (commonly 630A, 1250A, or higher) - Creepage Distance: 450mm (optimized for polluted environments) - Insulation Material: Porcelain or silicone rubber (for lightweight and vandal-resistant options) - Flange Material: Galvanized steel or aluminum for corrosion resistance - Sealing: Hermetic sealing prevents moisture ingress, ensuring long-term reliability Applications This wall bushing is widely used in: - Substations: For transitioning cables or conductors between indoor and outdoor sections. - Transformers: As a feed-through component for high-voltage connections. - Switchgear and GIS (Gas-Insulated Switchgear): To maintain insulation integrity while passing through grounded enclosures. Installation and Maintenance Installation requires proper alignment and torque application to the flange bolts to avoid mechanical stress. Periodic inspections should check for cracks, contamination, or signs of partial discharge. Cleaning may be necessary in heavily polluted areas to maintain insulation performance. Advantages - High Dielectric Strength: Ensures safe operation under high-voltage stress. - Environmental Resistance: Suitable for harsh climates and industrial areas. - Long Service Life: Durable materials and sealing extend operational reliability. In summary, the TG1A-40.5-(450) 40.5kV Wall Bushing is a critical component for high-voltage power systems, offering excellent electrical insulation, mechanical stability, and adaptability to diverse installation conditions. Its design prioritizes safety, efficiency, and compliance with global electrical standards.