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The 126kV Outdoor SF6 Breaker is a high-voltage switching device designed for outdoor substations, transmission networks, and power distribution systems operating at 110kV-126kV voltage levels. Using advanced SF6 gas arc-quenching technology and a sealed dead-tank structure, it provides reliable fault interruption, excellent insulation performance, and long-term operation under demanding outdoor environments.
Designed for utility-scale power systems, this outdoor SF6 circuit breaker combines a spring-operated mechanism, weather-resistant enclosure, and intelligent gas monitoring system to ensure stable performance in coastal areas, polluted environments, high-altitude regions, and extreme temperature conditions.
| Feature | Advantage |
|---|---|
| Outdoor Dead-Tank Structure | Protects internal interrupter components from moisture, dust, ice, and environmental stress |
| SF6 Gas Arc Extinguishing System | Provides fast interruption capability and excellent dielectric recovery after fault clearing |
| Spring Stored-Energy Mechanism | Ensures reliable opening and closing operations with reduced maintenance requirements |
| Weatherproof Design | Suitable for outdoor installation in harsh climates and polluted areas |
| Intelligent SF6 Density Monitoring | Provides real-time gas condition monitoring and operational safety protection |
The 126kV Outdoor SF6 Breaker is widely applied in high-voltage electrical systems where reliable switching and protection are essential.
| Parameter | Specification |
|---|---|
| Rated Voltage | 126 kV |
| Rated Frequency | 50/60 Hz |
| Rated Normal Current | 3150 A |
| Rated Short-Circuit Breaking Current | 40 kA |
| First-Pole-to-Clear Factor | 1.5 |
| SF6 Rated Pressure (20°C) | 0.6 MPa |
| Operating Sequence | O-0.3s-CO-180s-CO |
| Mechanical Endurance | 10,000 operations |
| SF6 Gas Weight per Pole | Approximately 2.5 kg |
| Ambient Temperature | -40°C to +50°C |
| Seismic Withstand | Up to 0.5g ground acceleration |
| Test Item | Value |
|---|---|
| Rated Voltage | 126 kV |
| Rated Current | 3150 A |
| Short-Circuit Breaking Current | 40 kA |
| Power Frequency Withstand Voltage | 230 kV (1 min) |
| Lightning Impulse Withstand Voltage | 550 kV peak |
| SF6 Leakage Rate | <0.5% per year |
| Break Time | ≤40 ms |
| Closing Time | ≤100 ms |
| Complete Breaker Weight | Approximately 1200 kg |
The outdoor design allows the breaker to maintain reliable operation in challenging installation conditions.
| Environment | Design Capability |
|---|---|
| Coastal and Humid Areas | Anti-corrosion galvanized structure and sealed mechanism housing |
| High Pollution Areas | Large creepage distance and optional silicone composite insulation |
| Cold Climate | Operation capability down to -40°C with heating options |
| Seismic Environment | Structural design supporting up to 0.5g acceleration |
The breaker adopts a self-blast SF6 interruption system that uses thermal expansion generated during high-current interruption to create efficient gas flow through the arc zone. For lower fault currents, a puffer-assisted mechanism ensures stable interruption performance across different operating conditions.
This optimized interruption technology reduces contact wear, improves electrical endurance, and ensures reliable operation throughout the service life of the equipment.
The control cabinet includes auxiliary switches, terminal blocks, and a temperature-compensated SF6 density monitor that provides alarm and lockout signals. The low-pressure protection function prevents breaker operation when SF6 density falls below the safe operating threshold.
The ground-level mechanism cabinet simplifies maintenance access, while SCADA-compatible interfaces enable remote monitoring and intelligent substation management.
Each 126kV Outdoor SF6 Breaker is tested before shipment to ensure reliable performance in real-world transmission applications.
A 126kV Outdoor SF6 Breaker is used in high-voltage substations and transmission networks to interrupt fault currents and protect transformers, transmission lines, and electrical equipment.
SF6 gas provides high dielectric strength and excellent arc extinguishing capability, making it suitable for reliable high-voltage switching applications.
The breaker is designed for outdoor environments including coastal areas, polluted regions, cold climates, and high-altitude substations.
Yes. Rated current, insulation configuration, control voltage, altitude adaptation, and mechanical structure can be customized according to project requirements.
Looking for a reliable 126kV Outdoor SF6 Breaker manufacturer or supplier? Contact us for technical specifications, customization options, and complete solutions for high-voltage substation projects.
