LW25 Outdoor Porcelain Type SF6 Circuit Breaker
2.Rated frequency:50Hz
3.Rated Normal Current:2000,3150,4000A
4. Spring: Electric motor charges closing spring; self-charges opening spring during closure.
5.Hydraulic: Disc spring energy storage (no nitrogen) with hydraulic actuation.
6.Pneumatic: Compressed-air opening / spring closing.
- Fast Delievery
- Quality Assurance
- 24/7 Customer Service
Product Introduction
1.LW25 Outdoor Porcelain Type SF6 Circuit Breaker: Reliable High-Voltage Protection
When you need robust, long-lasting protection for high-voltage transmission networks, the LW25 Outdoor Porcelain Type SF6 Circuit Breaker delivers unmatched performance. Designed for 72.5kV–252kV systems, this circuit breaker combines SF6 gas insulation with a durable porcelain housing to withstand extreme weather, heavy pollution, and rapid fault currents. Whether upgrading aging substations or deploying renewable energy grids, it ensures grid stability with minimal maintenance.
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2.Technical Specifications
- Rated Voltage: 126kV/145kV
- Rated Current: 2000A–4000A
- Rated Frequency: 50Hz
- Operating Mechanisms:
- Spring: Motor-charged closing spring; self-charging during closure.
- Hydraulic: Disc spring energy storage with hydraulic actuation (no nitrogen).
- Pneumatic: Compressed-air opening & spring closing.
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No. Item Unit LW25-363/Y LW25-420Y 1 Rated voltage kV 363 420 2 Rated frequency Hz 50 3 Rated normal current A 4000 4 Rated short-circuit breaking current kA 50 5 Rated short-circuit making current kA 125 6 Rated short-time withstand current and duration kA 50 7 Rated peak withstand current kA 125 8 Short-line fault breaking current kA 9 Rated out-of-phase breaking current kA 10 Creepage distance cm/kV 3.1 11 1min.power frequency withstand voltage Across open breaks kV 580 630+245 To earth kV 510 630 12 Rated lightning impulse withstand voltage Across open breaks kV 1175+205 1425+345 To earth kV 1175 1425 13 Rated switching impulse withstand voltage Across open breaks kV 1050+345 1050+345 To earth kV 1050 1050 14 5min.power frequency withstand voltage under zero-gauge pressure Across open breaks kV 1.3×363/√3 1.3×420/√3 To earth kV 2.0×363/√3 2.0×420/√3 15 Closing time ms 668~100 16 Opening time ms 18~30 17 Breaking time ms ≤50 18 Rated reclose operating duty 19 Close-open time ms 20 Operating asynchronism Between poles ms Between breaks ms 21 Rated pressure of SF6 gas MPa 22 Alarm/lock pressure of SF6 gas MPa 23 Annual leakage of SF6 gas % 24 Number of breaks per pole set 25 Close resistance Ω/phase 26 Time of pre-connection of close resistor ms 27 Operating times of mechanism times ≥10000 28 Load on terminal in Y-direction N 2000 29 Load on terminal in X-direction N 1750 30 Load on terminal in Z-direction N 1500 31 Resistance of main circuit μΩ ≤65 32 Operating mechanism Hydraulic mechanism 33 Weight of SF6 gas filled for each CB kg 45 34 Weight of one set of CB kg 6600 35 Applied standards
3.Key Features & Benefits
1. Built for Harsh Environments
The LW25’s porcelain housing resists corrosion, and temperature swings (-30°C to 50°C), making it ideal for coastal, desert, or industrial zones.
2. Low Maintenance, High Reliability
With self-charging mechanisms and a modular design, inspection intervals extend up to 25 years, reducing downtime and lifecycle costs.
3. Smart Grid Ready
Integrates with SCADA systems for real-time monitoring of SF6 gas pressure, contact wear, and operation cycles.
4. Eco-Friendly Performance
SF6 gas management minimizes leakage risks, aligning with global sustainability goals.
4.Real-World Applications
Utility Grids
- Replace outdated breakers in 220kV+ substations.
- Handle fault currents up to 50kA for urban grid resilience.
Mining & Oil/Gas
- Explosion-proof variants (ATEX/IECEx) for hazardous zones.
- Withstand dust, humidity, and vibration in remote sites.
Renewable Energy Farms
- LW25□-126 model manages capacitor/reactor switching in solar/wind farms.
- Fast response (<2 cycles) stabilizes fluctuating power inputs.
5.How It Works?
The LW25 Outdoor Porcelain Type SF6 Circuit Breaker uses SF6 gas to extinguish arcs during fault interruption. Its triple-break porcelain interrupters ensure rapid dielectric recovery, while the spring/hydraulic mechanisms provide consistent opening/closing force. The modular design allows easy phase-segregated maintenance without full shutdowns.
6.Manufacturing & Quality Control
Every LW25 unit undergoes:
- ISO 9001-Certified Production: Robotic assembly ensures precision.
- Rigorous Testing: 2000+ mechanical operations, 40kA short-circuit tests, and salt-fog corrosion trials.
- Traceability: Each component is logged for quality assurance.
7.Why Choose Us?
- Certified Expertise: ISO 9001, ISO 14001, and 20+ patents in high-voltage switchgear.
- Proven Track Record: Trusted by utilities in 30+ countries for grid upgrades.
- Custom Solutions: Tailor mechanisms, ratings, or housings to your grid needs.
- 24/7 Support: Rapid-response teams minimize downtime.
8.FAQ
1. What’s the maintenance interval for the LW25?
Routine inspections every 10–15 years; SF6 gas checks every 5 years.
2. Which mechanism is best for 220kV grids?
Hydraulic (LW25A-252/Y4000-50) offers stability in extreme climates.
3. Does it comply with IEC standards?
Yes, including IEC 62271-100 for dielectric strength.
4. How is SF6 leakage managed?
Integrated gas density monitors alert you to pressure drops.
5. Can it handle seismic zones?
Optional anti-vibration mounts meet IEEE 693 seismic standards.
9.Contact Us
Email: xaxd_electric@163.com
Let’s discuss how the LW25 Outdoor Porcelain Type SF6 Circuit Breaker can optimize your grid’s safety and efficiency.
10.Factory Show
11.Equipment Display
12.Application Cases
State Grid systems, power engineering, steel and metallurgy, petrochemicals, rail transportation, energy and water conservancy, construction, environmental protection, and renewable energy sectors
13.Team and Exhibition
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