Transmission Level Circuit Breaker

High-voltage transmission networks demand robust switching and protection solutions that ensure system stability and rapid fault isolation. Our comprehensive range of transmission level circuit breakers, including the 126KV SF6 Circuit Breaker, the 126kV Outdoor SF6 Breaker, the 126KV High Voltage SF6 Circuit Breaker, and the LW36-126 SF6 Circuit Breaker, delivers reliable interruption performance up to 126 kV with advanced self-blast interrupter technology. Each unit undergoes rigorous type testing to meet IEC 62271-100 standards, featuring optimized dielectric strength and minimal maintenance requirements. Below is a detailed breakdown of core electrical and mechanical parameters that define the performance envelope of these breakers.

The <产品名字> represents a cutting-edge solution for modern substations where operational flexibility and long service life are critical. Its interrupter chamber uses a puffer-assisted arc-quenching system combined with a low-energy spring operating mechanism, allowing for up to 10,000 CO operations before major overhaul. The design integrates composite bushings with silicone rubber sheds that deliver exceptional pollution withstand under salt fog conditions. A comprehensive monitoring package tracks SF6 gas density, contact wear, and operating times, feeding data into remote terminal units via IEC 61850 communication. Field installation is simplified by modular frame construction and factory-filled gas compartments, reducing commissioning time by nearly 30% compared to conventional designs. Beyond standard protection, the breaker excels in switching capacitor banks, shunt reactors, and long transmission lines where re-strike probability must be eliminated. The compact footprint and optional single-phase or three-phase gang-operated configurations allow seamless integration into both greenfield and brownfield substation layouts without compromising busbar spacing. With a rated normal current of up to 3150 A and a short-circuit breaking capacity of 40 kA, this breaker consistently handles high fault currents while maintaining insulation coordination across altitudes up to 1000 meters without derating.

• Rated voltage: 126 kV
• Rated frequency: 50/60 Hz
• Rated normal current: 2000 A, 2500 A, 3150 A (model-dependent)
• Rated short-circuit breaking current: 31.5 kA / 40 kA
• Rated short-circuit making current: 80 kA / 100 kA peak
• Rated short-time withstand current (3s): 31.5 kA / 40 kA
• First-pole-to-clear factor: 1.3 or 1.5
• Operating mechanism type: Spring, motor-charged
• Mechanical endurance: Class M2 (10,000 CO cycles)
• Ambient temperature range: -30°C to +50°C
• SF6 gas rated pressure (20°C): 0.6 MPa abs.
• Insulation medium: SF6 gas
• Control voltage: 110/220 V DC