TG3A-40.5-395 High Voltage Electrical Bushing Technical Description The TG3A-40.5-395 is a high-voltage electrical bushing designed for use in power transmission and distribution systems, specifically rated for 40.5 kV applications. This bushing serves as a critical interface between high-voltage equipment (such as transformers, circuit breakers, or switchgear) and external conductors, ensuring safe and reliable electrical insulation and mechanical support under demanding operational conditions. Key Features 1. Voltage Rating - The bushing is rated for a nominal system voltage of 40.5 kV, with a maximum withstand voltage compliant with international standards (e.g., IEC 60137 or IEEE Std 386). It is designed to handle transient overvoltages, lightning impulses, and power frequency withstand tests. 2. Current Capacity - The TG3A-40.5-395 supports high current-carrying capacity, typically up to 395 A, making it suitable for medium-to-high power applications. The conductive core is constructed from high-purity aluminum or copper to minimize resistive losses and ensure thermal stability. 3. Insulation System - The bushing employs a robust insulation design, utilizing porcelain or composite polymer housing to provide excellent dielectric strength and resistance to environmental factors such as moisture, UV radiation, and pollution. The internal insulation may consist of oil-impregnated paper, resin-bonded paper, or epoxy layers for enhanced performance. 4. Mechanical Durability - Designed for harsh environments, the bushing features a sturdy mechanical structure capable of withstanding wind, ice loads, and seismic activity. The flanged mounting ensures secure installation, while the sealing system prevents oil leakage in oil-filled equipment. 5. Temperature and Environmental Resistance - Operating temperature ranges typically from -40°C to +70°C, with resistance to thermal cycling. The external housing is designed to resist tracking and erosion caused by contamination or partial discharges. 6. Safety and Compliance - The bushing meets industry standards for partial discharge levels, power factor, and impulse withstand. It may include features such as a voltage tap for testing or monitoring purposes. Applications The TG3A-40.5-395 is widely used in: - Power transformers (step-up or step-down). - High-voltage switchgear and circuit breakers. - Substation equipment requiring reliable bushings for outdoor or indoor installations. Advantages - Long service life due to high-quality materials and corrosion-resistant design. - Low maintenance requirements, reducing downtime. - Adaptability to various mounting configurations and environmental conditions. In summary, the TG3A-40.5-395 high-voltage bushing is a precision-engineered component essential for ensuring the integrity and efficiency of electrical power systems, combining advanced insulation technology with mechanical robustness for demanding applications.