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The 126KV SF6 High Voltage Breaker for Substation is a high-performance switching device designed for 110kV-126kV transmission substations, power plants, and industrial electrical networks. Using advanced sulfur hexafluoride (SF6) insulation and arc-quenching technology, it provides reliable fault interruption, stable operation, and long service life in demanding high-voltage applications.
Designed for modern power grid protection, this SF6 circuit breaker supports rated breaking currents up to 40kA and is widely used for transformer protection, transmission line switching, reactor control, and substation modernization projects. The sealed pole structure, spring operating mechanism, and intelligent monitoring system help reduce maintenance requirements while improving grid reliability.
| Feature | Customer Benefit |
|---|---|
| Advanced SF6 Arc Extinguishing Technology | Fast and reliable interruption of short-circuit currents with excellent dielectric recovery performance |
| Spring Operating Mechanism | Lower maintenance requirements and stable mechanical performance without external hydraulic systems |
| Sealed Pole Design | Excellent insulation reliability with reduced SF6 leakage risk |
| High Mechanical Endurance | More than 10,000 CO operations for long-term substation service |
| Outdoor Environmental Adaptability | Suitable for coastal areas, high-altitude regions, and harsh weather conditions |
The 126KV SF6 High Voltage Breaker is widely applied in medium and high-voltage transmission systems where reliable switching and fault protection are required.
| Parameter | Specification |
|---|---|
| Rated Voltage | 126 kV (Suitable for 110kV-145kV transmission systems) |
| Rated Frequency | 50/60 Hz |
| Rated Normal Current | 2000A / 2500A / 3150A |
| Rated Short-Circuit Breaking Current | 31.5kA / 40kA |
| Rated Short-Time Withstand Current | 31.5kA / 40kA (3 seconds) |
| Rated Peak Withstand Current | 80kA / 100kA |
| SF6 Gas Pressure (20°C) | 0.50 MPa rated pressure, 0.45 MPa alarm pressure |
| Mechanical Endurance | M2 Class, 10,000 CO operations |
| Electrical Endurance | E2 Class |
| Breaking Time | ≤3 cycles |
| Closing Time | ≤100 ms |
| Operating Mechanism | Motor-wound spring mechanism with manual emergency charging |
| SF6 Leakage Rate | ≤0.5% per year |
| Item | Standard Range | Optional Customization |
|---|---|---|
| Ambient Temperature | -30°C to +40°C | -50°C to +50°C with heating system |
| Installation Altitude | ≤1000m | Up to 4000m with altitude correction |
| Seismic Resistance | 0.25g | 0.5g reinforced structure available |
| Bushing Material | High-strength porcelain | Silicone composite insulator option |
| Protection Level | IP55 mechanism cabinet | IP65 available |
The 126KV SF6 High Voltage Breaker is designed according to international high-voltage switchgear requirements to ensure safe and reliable operation in transmission systems.
The breaker is equipped with a temperature-compensated SF6 density monitor to provide accurate alarm and lockout signals. The mechanism cabinet includes anti-condensation heaters controlled by a hygrostat, ensuring stable operation in humid environments.
A mechanical position indicator allows easy inspection from ground level, while auxiliary switches provide reliable feedback for SCADA monitoring systems. Optional digital sensors can support predictive maintenance by monitoring operating conditions and contact performance.
Each interrupter assembly uses high-purity SF6 gas and undergoes factory sealing procedures to prevent moisture ingress during transportation and long-term operation.
Every 126KV SF6 High Voltage Breaker undergoes strict factory testing before shipment to ensure reliable performance in real-world substation environments.
A 126KV SF6 High Voltage Breaker is mainly used in 110kV-126kV substations to protect transformers, transmission lines, and electrical equipment by safely interrupting abnormal currents and short circuits.
The typical rated short-circuit breaking capacity is 31.5kA or 40kA depending on project requirements and grid conditions.
SF6 circuit breakers provide excellent insulation performance, efficient arc extinguishing capability, compact structure, and reliable operation under high-voltage conditions.
Yes. Rated current, control voltage, insulation distance, altitude adaptation, bushing type, and other configurations can be customized according to different project requirements.
Looking for a reliable 126KV SF6 High Voltage Breaker manufacturer for your substation project? Contact us for technical specifications, customization options, and professional support for transmission and distribution applications.
