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The 126KV Transmission SF6 Circuit Breaker is a high-voltage switching device designed for 110kV-126kV transmission substations, power plants, and industrial power networks. It uses sulfur hexafluoride (SF6) gas arc-quenching technology to safely interrupt short-circuit currents and provide reliable protection for transformers, transmission lines, and electrical equipment.
Designed for outdoor high-voltage applications, this SF6 circuit breaker combines a sealed interrupter chamber, spring-operated mechanism, and high-performance insulation system to achieve long service life, low maintenance requirements, and stable operation under demanding environmental conditions.
| Feature | Customer Benefits |
|---|---|
| SF6 Gas Arc Extinguishing Technology | Fast arc extinction and excellent dielectric recovery for reliable fault interruption |
| Spring Stored-Energy Operating Mechanism | Simple structure, high reliability, and reduced maintenance compared with hydraulic systems |
| Outdoor High Voltage Design | Suitable for substations exposed to rain, dust, pollution, and temperature variations |
| High Mechanical Endurance | More than 10,000 operating cycles for long-term grid applications |
| SCADA Monitoring Compatibility | Real-time operating status feedback for intelligent substation management |
The 126KV Transmission SF6 Circuit Breaker is widely used in high-voltage power systems where safe switching and reliable fault protection are required.
| Parameter | Specification |
|---|---|
| Rated Voltage | 126 kV |
| Rated Current | 2500A / 3150A optional |
| Rated Short-Circuit Breaking Current | 40 kA |
| Rated Short-Circuit Making Current | 100 kA peak |
| SF6 Gas Pressure (20°C) | 0.6 MPa absolute pressure |
| Operating Mechanism | Motor-driven spring stored-energy mechanism |
| Control Voltage | DC 110V / 220V |
| Mechanical Endurance | ≥10,000 operations |
| Creepage Distance | ≥3150mm for heavy pollution environments |
The breaker is designed according to international high-voltage switchgear requirements to ensure safe and reliable operation in transmission networks.
| Test Item | Performance Value | Reference Standard |
|---|---|---|
| Power Frequency Withstand Voltage (1 min) | 230 kV rms | IEC 62271-100 |
| Lightning Impulse Withstand Voltage | 550 kV peak | IEC 62271-100 |
| Short-Time Withstand Current | 40 kA / 3 seconds | IEC 62271-100 |
| Operating Sequence | O–0.3s–CO–3min–CO | IEC 62271-100 |
| Break Time | ≤60 ms | IEC 62271-100 |
| SF6 Leakage Rate | ≤0.5% per year | IEC 62271 requirements |
| Item | Standard Capability |
|---|---|
| Ambient Temperature | -30°C to +40°C |
| Insulation Material | Porcelain or composite insulator |
| Frame Material | Corrosion-resistant galvanized steel structure |
| Installation Type | Outdoor substation installation |
| Description | Value |
|---|---|
| Phase Distance | 800 mm |
| Overall Height | Approximately 2900 mm |
| Breaker Depth | Approximately 1200 mm |
| Three-phase Weight | Approximately 1800 kg |
The 126KV Transmission SF6 Circuit Breaker integrates multiple protection and monitoring functions to improve substation reliability. The SF6 density monitoring system provides temperature-compensated pressure indication, while auxiliary switches and position indicators deliver accurate operating status feedback for remote control systems.
The mechanism cabinet is equipped with anti-condensation heating to prevent moisture accumulation in humid environments. Optional digital monitoring components can support predictive maintenance by tracking breaker operation conditions and mechanical performance.
Before delivery, every 126KV SF6 Circuit Breaker undergoes strict factory inspection to ensure stable performance and compliance with project requirements.
A 126KV Transmission SF6 Circuit Breaker is a high-voltage protection device used in 110kV-126kV power transmission systems to interrupt fault currents and protect electrical equipment.
SF6 gas provides excellent insulation strength and efficient arc extinguishing capability, allowing circuit breakers to interrupt high fault currents safely and reliably.
It is commonly used in transmission substations, power plants, renewable energy projects, and industrial high-voltage networks.
Yes. Rated current, control voltage, insulation configuration, altitude adaptation, and mechanical structure can be customized according to project requirements.
Looking for a reliable 126KV SF6 Circuit Breaker manufacturer or supplier for your transmission project? Contact us for technical specifications, customization solutions, and professional support for high-voltage substation applications.
