LW-252/4000-50 4000A Outdoor SF6 Circuit Breaker Technical Description The LW-252/4000-50 is a high-performance outdoor SF6 circuit breaker designed for 4000A rated current and 50kA short-circuit breaking capacity, suitable for 252kV high-voltage power transmission and distribution systems. It employs sulfur hexafluoride (SF6) gas as the insulating and arc-quenching medium, ensuring reliable operation under extreme conditions while minimizing maintenance requirements. Key Features 1. High Breaking Capacity: With a 50kA interrupting capacity, the breaker effectively handles severe fault currents, ensuring grid stability and equipment protection. The advanced arc-extinguishing mechanism leverages SF6 gas’s superior dielectric strength to rapidly quench arcs, even under high-voltage transients. 2. Robust Mechanical Design: The outdoor-rated enclosure is constructed from weather-resistant materials, including corrosion-proof aluminum alloy or stainless steel components, ensuring durability in harsh environments (e.g., extreme temperatures, pollution, or humidity). The breaker meets IEC 62271 standards for mechanical endurance, supporting 10,000 mechanical operations without degradation. 3. SF6 Gas Insulation: The sealed gas system maintains optimal pressure for insulation and arc suppression, with integrated density monitors and automatic pressure relief valves to detect leaks or overpressure. Gas handling complies with environmental regulations, including low-emission design and end-of-life recycling protocols. 4. Spring-Operated Mechanism: A motorized spring储能机构 ensures fast, reliable opening/closing (typically ≤60ms), reducing fault clearance time. The mechanism includes anti-pump and anti-bounce controls to prevent re-striking during faults. 5. Smart Monitoring (Optional): Modern variants may feature IoT-enabled sensors for real-time monitoring of gas density, contact wear, and operational parameters, enabling predictive maintenance and integration with SCADA systems. Applications - Transmission substations (252kV networks) - Renewable energy plants (wind/solar grid interconnection) - Industrial power systems requiring high fault tolerance Standards Compliance - IEC 62271-100/GB 1984 (HV circuit breakers) - IEC 60068 (environmental testing) - IEEE C37.04 (interrupting ratings) Advantages - Low maintenance (sealed gas system, minimal moving parts) - Compact footprint compared to air-insulated breakers - Eco-conscious SF6 management (leak detection, gas recovery) Conclusion The LW-252/4000-50 combines cutting-edge SF6 technology with ruggedized design, delivering reliable protection for critical high-voltage infrastructure. Its high breaking capacity, environmental resilience, and optional smart features make it a versatile solution for modern power grids. (Word count: 500) --- Note: Specifications are indicative; refer to manufacturer datasheets for exact parameters.