LW36-126T/3150-40 High Voltage AC SF6 Circuit Breaker – Technical Overview The LW36-126T/3150-40 is a high-voltage alternating current (AC) circuit breaker designed for electrical power transmission and distribution systems. It operates at a rated voltage of 126 kV and a rated current of 3150 A, with a short-circuit breaking capacity of 40 kA. Utilizing sulfur hexafluoride (SF6) gas as the insulating and arc-quenching medium, this circuit breaker ensures reliable performance in high-voltage applications while minimizing environmental and operational risks. Design and Construction The breaker features a compact, modular design optimized for outdoor installation in substations or switchyards. Its three-phase, single-pole operating mechanism is housed in a robust, weatherproof enclosure, ensuring durability under harsh environmental conditions. The SF6 gas insulation system provides superior dielectric strength, enabling efficient arc extinction during fault interruption. The gas density is monitored via integrated pressure sensors, ensuring optimal performance and safety. Operating Mechanism The LW36-126T employs a spring-operated mechanism for high-speed, low-energy operation. This mechanism ensures rapid opening and closing (typically within 2–3 cycles) to isolate faults and maintain grid stability. The breaker supports remote control via SCADA systems, enabling seamless integration into automated power networks. Auxiliary contacts and alarm signals provide real-time status monitoring for maintenance and fault diagnostics. Performance Characteristics - Rated Voltage: 126 kV - Rated Current: 3150 A - Breaking Capacity: 40 kA (short-circuit current) - SF6 Gas Pressure: Typically maintained at 0.4–0.6 MPa (absolute) - Mechanical Life: ≥10,000 operations - Environmental Compliance: Meets IEC 62271 and IEEE C37 standards for high-voltage equipment. Applications This circuit breaker is widely used in: - Transmission substations - Renewable energy integration (wind/solar farms) - Industrial power systems requiring high fault tolerance Advantages - High Reliability: SF6 gas ensures minimal maintenance and long service life. - Fast Operation: Spring mechanism enables quick response to grid faults. - Eco-Friendly: SF6 leakage detection minimizes environmental impact. - Adaptability: Suitable for diverse climatic conditions (-30°C to +40°C). Conclusion The LW36-126T/3150-40 SF6 circuit breaker is a critical component in modern high-voltage networks, offering robust performance, safety, and efficiency. Its advanced design and compliance with international standards make it a preferred choice for utilities and industries worldwide.