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Modern high-voltage substations rely on SF6 circuit breakers for reliable arc quenching and current interruption under demanding conditions. Our lineup encompasses several specialized configurations, including the 66KV SF6 Circuit Breaker designed for standard medium-voltage grid applications, the 66KV Gas Insulated Circuit Breaker that integrates seamlessly into compact GIS substations, and the 66KV Outdoor SF6 Circuit Breaker engineered to withstand harsh environmental exposure. For installations requiring robust, high-capacity performance, the Tank Type SF6 Breaker delivers exceptional dielectric strength and operational longevity. Each breaker employs pressurized sulfur hexafluoride gas to extinguish arcs rapidly, minimizing contact wear and ensuring thousands of interruption cycles. Advanced spring-operated or hydraulic mechanisms provide consistent closing and opening times, while embedded current transformers and control cabinets allow effortless integration into automated protection schemes.
The High Voltage SF6 Circuit Breaker series prioritizes safety and maintenance ease through sealed gas compartments, absorbent desiccants captured inside the porcelain or composite housings, and monitoring ports for routine gas analysis. Temperature compensation ensures consistent density readings, and manifold gauges alert operators to any pressure deviations before they affect performance. Interrupting capacities range from 25 kA to 50 kA, matched with rated voltages up to 145 kV for primary distribution and transmission corridors. Busbar configurations and terminal pads accommodate both tubular and flat connectors, simplifying buswork design. The product family covers indoor and outdoor variants, with optional live-tank or dead-tank architecture, catering to utility standards across IEC and IEEE markets. Factory testing includes full sequence type tests, partial discharge measurements, and mechanical endurance runs exceeding 10,000 operations, confirming readiness for decades of uninterrupted service.
| Parameter | 66 kV Class | 126 kV Class | 145 kV Class |
|---|---|---|---|
| Rated voltage (Ur) | 72.5 kV | 126 kV | 145 kV |
| Power frequency withstand (1 min) | 140 kV | 230 kV | 275 kV |
| Lightning impulse withstand (BIL) | 325 kV | 550 kV | 650 kV |
| Rated normal current | 1250 / 2000 / 3150 A | 2000 / 3150 A | 2000 / 3150 A |
| Short-circuit current (sym.) | 31.5 / 40 kA | 31.5 / 40 / 50 kA | 40 / 50 kA |
| Break time (cycle) | ≤ 3 cycles | ≤ 3 cycles | ≤ 3 cycles |
| SF6 gas mass | 5 – 8 kg | 8 – 14 kg | 12 – 18 kg |
| Pole center distance | 950 – 1300 mm | 1400 – 1800 mm | 1500 – 2000 mm |
| Weight (typical) | 1200 – 2000 kg | 2200 – 3500 kg | 3000 – 4500 kg |
