TG7-15 15kV High Voltage Wall Bushing – Technical Description The TG7-15 15kV High Voltage Wall Bushing is a critical electrical component designed to facilitate the safe and efficient passage of high-voltage conductors through walls, barriers, or enclosures in power distribution systems. Rated for 15 kilovolts (kV), this bushing ensures reliable insulation and mechanical support while maintaining electrical integrity in demanding environments. Design and Construction The bushing features a robust design with high-quality materials to withstand electrical, thermal, and mechanical stresses. Key components include: - Insulating Body: Typically made of porcelain or composite polymer, providing excellent dielectric strength and resistance to environmental factors such as moisture, UV radiation, and pollution. - Conductive Core: A central conductor, usually copper or aluminum, ensures low resistance and high current-carrying capacity. - Flange and Sealing System: A metallic flange securely mounts the bushing to the wall or enclosure, while gaskets or O-rings prevent moisture ingress, ensuring long-term reliability. - Terminal Connections: Equipped with standardized terminals for easy integration into switchgear, transformers, or cable systems. Electrical Performance - Rated Voltage: 15kV (suitable for medium-voltage applications). - Power Frequency Withstand Voltage: Complies with IEC or ANSI standards, typically tested at 38kV for 1 minute. - Lightning Impulse Withstand Voltage: Designed to endure transient overvoltages, often rated at 95kV peak. - Partial Discharge: Minimal discharge levels ensure long-term insulation integrity. Mechanical and Environmental Durability - Temperature Range: Operates reliably from -40°C to +70°C, suitable for both indoor and outdoor installations. - Pollution Resistance: Creepage distance and shed design mitigate surface leakage currents in contaminated environments. - Corrosion Protection: Galvanized or stainless-steel hardware resists rust in harsh conditions. Applications The TG7-15 bushing is widely used in: - Substations and switchgear for wall penetrations. - Transformers and reactors to connect internal windings to external circuits. - Industrial power systems where high-voltage cables pass through barriers. Safety and Compliance Certified to international standards such as IEC 60137, IEEE C57.19.00, or equivalent, ensuring compatibility with global electrical infrastructure. Advantages - Compact and lightweight for easy installation. - Low maintenance due to durable materials and sealed construction. - Versatile mounting options for horizontal or vertical orientations. In summary, the TG7-15 15kV High Voltage Wall Bushing is a precision-engineered solution for safe, high-performance electrical isolation in medium-voltage systems, combining reliability, durability, and compliance with industry standards.