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LW9-72.5 / 66kV Outdoor SF₆ Circuit Breaker
The LW9—72.5/T2500—31.5 outdoor three-pole AC 50Hz high-voltage SF₆ circuit breaker is primarily designed for the protection of transmission and distribution lines, and can also be used as a tie circuit breaker. It features a three-pole assembly mounted on a single frame and does not support single-pole operation.
I. Compliance
This 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》.
II. Operating Environmental Conditions
| Condition | Specification |
|---|---|
| Ambient Temperature | -30℃ ~ +40℃ (interrupting current is 25kA at -45℃ ~ +40℃) |
| Altitude | ≤ 1000m |
| Natural Wind Speed | ≤ 35m/s |
| Ice Accretion Thickness | ≤ 10mm |
| Seismic Ground Acceleration | Horizontal: ≤ 0.4g; Vertical: ≤ 0.2g |
| Daily Temperature Difference | ≤ 25℃ |
III. Performance Features
1. SF₆ Arc Extinguishing Medium
The breaker uses sulfur hexafluoride (SF₆) gas as its arc extinguishing medium, which offers excellent arc quenching and electrical insulation performance. During interruption, the gas is compressed by a cylinder and blown onto the arc to extinguish it. This design delivers a simple structure, excellent interrupting performance, and stable operation, making it an ideal switch for switching capacitor banks and reactor banks.
2. Superior Interrupting Performance
It can reliably interrupt various abnormal short-circuit faults, including phase opposition faults, two-pole simultaneous grounding on both sides, near-zone faults, and breaker terminal faults.
3. Low Operational Noise
The fully sealed design isolates the breaker from the atmosphere, eliminating noise from gas discharge during operation.
4. Compact & Simple Structure
The interrupter uses a single-break design with no additional valve systems, resulting in a very simple and compact configuration.
5. Low Maintenance Requirements
The simple structure and minimal contact wear during SF₆ gas interruption significantly reduce maintenance workload and extend inspection intervals.
6. Safe & Reliable Operation
Pure SF₆ gas is non-toxic and non-flammable, and the hermetically sealed interrupter ensures safe and reliable operation.
Why Choose Weisho Electric
Professional HV Equipment Manufacturer
Decades of experience producing SF₆ switchgear and HV protection products.
Strict Quality Control
Each unit undergoes full routine tests, including:
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Power frequency withstand tests
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Lightning impulse tests
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Vacuum leak tests
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Mechanical operation tests
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Temperature rise test (as required)
Global Export Experience
Products are widely used in Africa, Southeast Asia, the Middle East, and South America.
Customization Capability
Engineers can adjust bushings, mechanisms, CT ratios, auxiliary devices, and terminal configurations.
Fast Delivery & Complete After-Sales Support
24/7 technical support and spare parts available worldwide.
Frequently Asked Questions (FAQ)
1. What is the typical delivery time?
Standard lead time is 25–35 days, depending on quantity.
2. Can the breaker be used in high-altitude regions?
The standard model supports ≤1000m altitude.
Higher-altitude versions can be customized.
3. Does the breaker come filled with SF₆ gas?
Yes, breakers are shipped fully assembled and pre-filled with SF₆ gas.
4. Can Weisho provide a test report or Type Test Certificate?
Yes, routine test reports are supplied. Type tests are available upon request.
5. Is remote operation supported?
Yes. The CT26 spring mechanism supports remote control via SCADA/RTU.
6. What is the expected service life?
Designed for 20–30 years under normal operating conditions.
Contact Us
Tel: +8615957770984
Email: thor@weishoelec.com
Contact Us
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