LW9-72.5 / 66kV Outdoor SF6 Circuit Breaker
The LW9-72.5 / 66kV Outdoor SF6 Circuit Breaker is a reliable high-voltage switching device designed for 72.5kV transmission and distribution systems. Using SF6 gas as the arc-extinguishing and insulation medium, it provides excellent interruption performance, stable operation, and low maintenance requirements. With a compact three-pole structure and reliable switching capability, the LW9-72.5 is widely used for transmission line protection, tie switching, capacitor bank switching, and reactor bank applications in outdoor substations.
Get a QuoteOverview
The LW9-72.5/T2500-31.5 Outdoor High Voltage SF6 Circuit Breaker is designed for 72.5kV, 50Hz three-phase AC power systems, primarily providing reliable protection and switching for transmission and distribution lines. It can also be applied as a tie circuit breaker in high-voltage substations and power networks.
The breaker adopts a three-pole integrated structure mounted on a common frame, with all poles mechanically linked and no provision for single-pole operation. This design ensures stable three-phase switching performance and reliable operation in outdoor high-voltage applications.
The LW9-72.5 SF6 Circuit Breaker complies with the requirements of GB 1984 “High-Voltage Alternating Current Circuit Breakers” and meets the international standard IEC 60056 “High-Voltage Alternating Current Circuit Breakers”, ensuring reliable performance and compatibility with modern power system requirements.
Operating Conditions
1. Ambient Temperature: -30℃ ~ +40℃ (interrupting current is 25kA at -45℃ ~ +40℃);
2. Altitude: ≤ 1000m;
3. Wind speed: < 35m/s
4.Ice Accretion Thickness: ≤ 10mm;
5. Seismic Ground Acceleration: Horizontal: ≤ 0.4g; Vertical: ≤ 0.2g;
6. Daily Temperature Difference: ≤ 25℃.
Features
Advanced SF6 Arc-Extinguishing Technology
The LW9-72.5 Outdoor SF6 Circuit Breaker uses SF6 (Sulfur Hexafluoride) gas as both the arc-extinguishing and insulating medium. During interruption, the gas is compressed within the interrupter and directed onto the arc, ensuring fast and reliable arc extinction. This design provides excellent switching performance, stable operation, and is particularly suitable for capacitor bank and reactor switching applications.
Excellent Fault Interruption Capability
The LW9-72.5 is engineered to interrupt a wide range of fault conditions with high reliability, including:
- Phase opposition faults
- Two-pole simultaneous grounding faults on both sides
- Near-zone faults
- Breaker terminal faults
Its advanced interruption system helps maintain reliable protection for high-voltage transmission and distribution networks.
Low Operating Noise
The breaker adopts a fully sealed structure that isolates the SF6 gas chamber from the external environment, effectively reducing operating noise by eliminating gas discharge during switching operations.
Compact and Simplified Structure
The interrupter features a single-break design without additional valve mechanisms, resulting in a compact structure that simplifies installation, operation, and long-term equipment management.
Key benefits include:
- Compact overall dimensions
- Simplified mechanical structure
- Improved installation efficiency
Reduced Maintenance Requirements
Thanks to its optimized construction and the low contact wear characteristics of SF6 interruption technology, the LW9-72.5 requires minimal routine maintenance while extending inspection intervals.
Main advantages include:
- Reduced maintenance workload
- Lower contact wear
- Extended service intervals
- Improved long-term reliability
Safe and Reliable Operation
The breaker utilizes high-purity SF6 gas, which is non-flammable and non-toxic under normal operating conditions. Combined with the hermetically sealed interrupter design, it provides stable insulation performance and dependable operation throughout its service life.
Overall and mounting dimensions(mm)
