LW36-126/T3150-40 Tank Type GIS Circuit Breaker – Technical Description The LW36-126/T3150-40 is a high-voltage tank-type Gas Insulated Switchgear (GIS) circuit breaker designed for reliable operation in electrical power transmission and distribution systems. Rated at 126 kV with a breaking current capacity of 3150 A and a short-circuit interrupting capability of 40 kA, this breaker ensures robust performance in demanding grid applications. Design and Construction The circuit breaker features a compact, sealed tank design filled with sulfur hexafluoride (SF₆) gas, which provides superior dielectric strength and arc-quenching properties compared to air or oil insulation. The tank-type GIS configuration integrates the breaker, disconnector, and earthing switch into a single, modular unit, reducing footprint and enhancing reliability in substations. The breaker utilizes a spring-operated or hydraulic/pneumatic mechanism for rapid, low-energy switching operations. The operating mechanism is designed for high mechanical endurance, typically exceeding 10,000 operations, ensuring long service life with minimal maintenance. Key Features 1. High Breaking Capacity: With a rated short-circuit breaking current of 40 kA, the LW36-126/T3150-40 can safely interrupt severe fault currents, protecting equipment and maintaining grid stability. 2. SF₆ Gas Insulation: The sealed tank design prevents gas leakage, ensuring consistent insulation performance and environmental safety. Gas density monitoring is integrated for real-time condition assessment. 3. Modular GIS Integration: The breaker is compatible with GIS substation layouts, offering space-saving advantages and simplified installation. 4. Low Maintenance: The self-contained mechanism and gas insulation reduce wear and contamination, extending maintenance intervals. 5. Environmental Adaptability: Designed for indoor or outdoor installation, the breaker operates reliably across a wide temperature range (-30°C to +40°C) and harsh conditions. Applications This circuit breaker is widely used in: - High-voltage substations (110–132 kV systems) - Renewable energy integration (wind/solar farms) - Industrial power plants and transmission networks - Urban power distribution with space constraints Safety and Compliance The LW36-126/T3150-40 complies with international standards such as IEC 62271 and IEEE C37, ensuring safety, interoperability, and performance consistency. Its fail-safe design includes anti-condensation measures, corrosion-resistant materials, and fault-indication systems. Conclusion The LW36-126/T3150-40 tank-type GIS circuit breaker combines advanced SF₆ insulation, high breaking capacity, and compact modularity to deliver efficient, low-maintenance switching for modern power grids. Its robust construction and adaptability make it a preferred choice for utilities and industries prioritizing reliability and space optimization.