LW-252/4000-50 Outdoor SF6 Circuit Breaker (252kV, 4000A, 50kA) – Technical Description The LW-252/4000-50 is a high-voltage outdoor SF6 circuit breaker designed for 252kV power transmission systems. It features a rated current of 4000A and a short-circuit breaking capacity of 50kA, making it suitable for substations and grid applications requiring reliable interruption under extreme fault conditions. Key Features 1. SF6 Gas Insulation & Arc Quenching - Utilizes sulfur hexafluoride (SF6) gas for superior dielectric strength and arc-extinguishing performance. - Self-extinguishing design ensures rapid arc interruption, minimizing contact erosion. 2. Robust Mechanical Design - Spring-operated or hydraulic/pneumatic mechanism (depending on configuration) for fast, reliable operation. - Modular porcelain or composite insulator housing for weather resistance and mechanical stability. 3. High Breaking Capacity - 50kA short-circuit current interruption capability, compliant with IEC 62271 or IEEE standards. - Low operating energy due to optimized interrupter design, reducing wear. 4. Environmental & Safety Features - Low SF6 gas leakage rate (<0.5% per year) with integrated gas monitoring. - Anti-condensation heaters for operation in humid or cold climates (-30°C to +40°C). 5. Maintenance & Monitoring - Condition-based monitoring options (gas density, contact wear, operation counters). - Long maintenance intervals (typically 10+ years) due to minimal moving parts. Applications - Transmission substations (220–245kV grids). - Renewable energy integration (wind/solar farms). - Industrial power plants requiring high fault tolerance. Standards Compliance - IEC 62271-100/GB 1984 (high-voltage circuit breaker standards). - IP55 protection against dust and water ingress. Advantages - Compact footprint vs. air-insulated breakers. - Silent operation with no flammable materials. - Adaptable for remote control via SCADA systems. This breaker ensures grid stability with minimal lifecycle costs, ideal for utilities prioritizing durability and performance.