SF6 gas-insulated circuit breaker LW55B-800

SF6voltagehorizontal

Product overview LW55B-800 is a tank-type SF6 circuit breaker developed for China's 750 kV UHV grid construction and represents the first domestically developed 800 kV tank breaker variant. The design combines circuit breaker, current transformers (CT) and outgoing bushings in a series double-break horizontal arrangement. CT windings use conventional electromagnetic principles and are arranged on both sides of the breaker; their layout can be configured per customer requirements. The breaker provides high insulation level in accordance with national and industry high-grade standards, a rated current of 6000 A and robust short-circuit performance.

Classification High-voltage equipment - Circuit breakers

Technical specifications

• Model: LW55B-800
• Structure: Tank-type, double-break in series, horizontal arrangement
• Composition: Circuit breaker, current transformers (CT), outgoing bushings
• Current transformers: Conventional electromagnetic windings, arranged at both sides, configurable
• Rated current: 6000 A
• Short-time withstand current: 63 kA
• Cumulative breaking operations at rated short-circuit breaking current: 16 operations
• DC component decay time constant: 120 ms
• Mechanical life: 10000 operations
• Insulation level: Meets national and industry high-grade requirements
• Structural characteristics: Low center of gravity, seismic-resistant, high structural strength
• Engineering application: Applicable to filter switching groups; supports phase-selective closing or closing-resistor technical routes as required