The LW36-72.5 porcelain post-type high-voltage AC SF6 circuit breaker is equipped with a CT20 spring operating mechanism. It adopts the self-energy arc extinction principle and features a single-break structure. The three poles of each circuit breaker are mounted on a single frame and are mechanically interconnected through a drive mechanism. The electrical control allows for both remote and local operation.
Parameter Name Unit LW36-72.5 LW25-126/145 LW25-252 LW15B-252
LW15-252Rated voltage kV 66 126 / 145 252 252 Rated frequency Hz 50 50 50 50 Rated current A 1250, 3150, 4000 2000, 3150 4000 3150, 4000 Rated breaking current kA 25, 31.5 40 / 31.5 40 50 Rated closing current (peak) kA 80 100 / 80 100 125 Rated short-time withstand current (4s) kA 31.5 40 / 31.5 40 50 Rated peak withstand current kA 80 100 / 80 100 125 Near fault breaking current kA 90% lk,
75% lk– – – Rated out-of-step breaking current kA 25% lk – – – Creepage distance cm/kV 3.1 2.5, 3.1 – – 1-min power frequency withstand voltage (dry test) – To ground kV 160 275 460 460 – Inter-pole kV 160 275 – – – Fracture kV 160 + 42 275 395 + 145 395 + 145 1-min power frequency withstand voltage (wet test) – To ground kV 160 275 460 460 – Inter-pole kV 160 275 – – – Fracture kV 410 650 / 750 950 + 206 950 + 206 Rated lightning impulse withstand voltage – To ground kV 350 550 / 650 1050 1050 – Inter-pole kV 350 550 / 650 – – 5-min zero-pressure withstand voltage kV 84 95 / 124 189 189 Closing time ms ≤150 ≤150 ≤110 ≤100 Opening time ms ≤30 ≤30 (reclosing ≤35) ≤30 ≤25 Breaking time ms ≤60 ≤60 ≤60 ≤60 Closing-Opening time ms 40-60 40-60 50-70 40-60 Phase asynchronism time ms ≤2 (open), ≤4 (close) ≤2 (open), ≤4 (close) ≤2 (open) ≤2 (open) Rated reclosing sequence – O—0.3s—CO—180s—CO O—0.3s—CO—180s—CO – – SF6 gas rated pressure MPa 0.5 / 0.4 0.5 0.6 0.6 SF6 gas alarm/lock pressure MPa 0.45/0.40, 0.35/0.30 0.45/0.40 0.55/0.50 0.55/0.50 SF6 gas annual leakage rate %/Year ≤0.5 ≤0.5 ≤0.5 ≤0.5 Number of fractures per pole – 1 1 1 1 Mechanical life Times 3000 3000 3000 3000 Terminal mechanical strength – Horizontal longitudinal tension N 790 1250 1500 1500 – Horizontal lateral tension N 750 750 1000 1000 – Vertical tension N 750 1000 1250 1250 Main circuit resistance μΩ ≤50 ≤45 ≤45 ≤42 Matching mechanism – Spring Spring Spring/
HydraulicHydraulic/
PneumaticSF6 gas weight per unit kg 4 6 30 30 Circuit breaker weight kg 1000 1400 3500 4000 / 4500 Standards compliance – GB/T 1984, IEC 60056 GB/T 1984, IEC 60056 GB/T 1984 GB/T 1984
The LW36-72.5 Porcelain Post High Voltage AC SF6 Circuit Breaker is a state-of-the-art electrical device designed for reliable and efficient protection of high-voltage Power Systems. Operating at 72.5kV, it combines the robustness of porcelain post insulators with the advanced insulation and arc-quenching properties of SF6 gas. This equipment is suitable for substations, power distribution systems, and industrial applications where consistent performance, safety, and long-term reliability are paramount.
In this comprehensive guide, we will cover the operating instructions, safety precautions, technical advantages, certifications, and other essential details to ensure proper utilization and maintenance of the LW36-72.5 circuit breaker.
Overview of LW36-72.5 Circuit Breaker
Technical Specifications
Operating Instructions
Safety Precautions and Maintenance
Key Technical Advantages
Product Certifications and Compliance
Installation Guidelines
Troubleshooting and Common Issues
Applications in Substations and Power Systems
Conclusion
The LW36-72.5 Porcelain Post SF6 Circuit Breaker is engineered for high-voltage AC applications, providing exceptional arc interruption, insulation, and switching capabilities. Its key features include:
Porcelain Post Insulators: High mechanical strength, weather resistance, and long-term reliability.
SF6 Gas Insulation: Superior dielectric properties and environmental stability for high-voltage operations.
Compact Design: Minimizes installation footprint while maximizing performance.
Reliable Operation: Designed for both manual and motorized operation, ensuring flexibility and efficiency.
This equipment is widely deployed in substations, industrial power systems, and electric utility networks, making it a vital component for modern electrical infrastructure.
The following table summarizes the primary specifications of the LW36-72.5 circuit breaker:
| Parameter | Specification |
|---|---|
| Rated Voltage | 72.5 kV |
| Rated Current | 630–1250 A |
| Short-Circuit Breaking Capacity | 20 kA / 25 kA |
| Operating Mechanism | Spring or Motor Driven |
| Insulation Medium | SF6 Gas |
| Insulator Material | Porcelain |
| Operating Frequency | 50 Hz / 60 Hz |
| Mechanical Endurance | 10,000 operations |
| Electrical Endurance | 2,000 operations |
| Ambient Temperature Range | -40°C to +50°C |
| Installation Type | Outdoor Post Type Substation |
These specifications demonstrate the robustness, reliability, and versatility of this high-voltage circuit breaker for demanding electrical environments.
Before using the LW36-72.5 circuit breaker, it is crucial to perform the following inspections:
Visual Inspection: Check for any cracks, damage, or contamination on the porcelain posts and SF6 tank.
Gas Pressure Check: Ensure SF6 gas pressure is within the recommended range (as indicated by the manufacturer’s pressure gauge).
Mechanical Operation Test: Verify the operating mechanism functions smoothly without obstruction.
Electrical Connection: Confirm all power and grounding connections are secure.
The LW36-72.5 can be operated either manually or via a motorized mechanism:
Manual Operation:
Turn the operating handle clockwise to close the breaker.
Turn the handle counterclockwise to open the breaker.
Observe the indicator to ensure the breaker has reached the intended position.
Motorized Operation:
Engage the control panel switch to initiate closing or opening.
Monitor the operation through the control system.
Ensure proper coordination with upstream and downstream protection devices.
After operation:
Record the operation time and status in the maintenance log.
Inspect the breaker for any abnormal noise or vibration.
Check the SF6 gas pressure and refill if necessary.
High-voltage equipment requires strict adherence to safety measures:
Always disconnect the power supply before maintenance.
Use personal protective equipment (PPE) such as insulated gloves, helmets, and safety glasses.
Avoid contact with SF6 gas; although non-toxic, it can displace oxygen in confined spaces.
Do not operate the breaker under extreme weather conditions without proper protective measures.
Regular maintenance ensures long-term reliability:
| Maintenance Task | Frequency | Description |
|---|---|---|
| SF6 Gas Pressure Check | Monthly | Ensure within manufacturer’s recommended range |
| Mechanical Operation Test | Quarterly | Test opening/closing mechanism |
| Insulator Cleaning | Bi-Annually | Remove dust, dirt, and bird droppings |
| Electrical Contact Inspection | Annually | Check for erosion, pitting, or corrosion |
| Lubrication of Moving Parts | Annually | Apply recommended lubricant |
The LW36-72.5 circuit breaker offers several advantages over conventional high-voltage switchgear:
SF6 gas provides excellent arc quenching capabilities.
Porcelain post insulators ensure electrical isolation and structural stability.
Designed for up to 10,000 mechanical operations and 2,000 electrical operations.
Stable performance under extreme weather conditions.
Reduced footprint for outdoor substations.
Modular construction simplifies installation and maintenance.
Long-lasting SF6 insulation reduces the frequency of servicing.
Durable porcelain material minimizes wear and tear.
The LW36-72.5 circuit breaker complies with international standards to guarantee quality and safety:
IEC 62271-100: High-voltage switchgear and controlgear.
ISO 9001: Quality management systems.
CE Certification: Conformity with EU safety, health, and environmental requirements.
RoHS Compliance: Restriction of hazardous substances.
These certifications ensure that the breaker meets global safety and operational standards and is suitable for international deployment.
Proper installation is critical for optimal performance:
Ensure a level and stable foundation.
Provide adequate clearance for operation and maintenance.
Ensure proper grounding and electrical connections.
Mount porcelain posts securely to the base frame.
Connect the breaker terminals to the substation busbar.
Fill the SF6 tank to the recommended pressure level.
Perform insulation resistance tests before energization.
Verify correct mechanical operation and alignment.
Document all commissioning results for future reference.
| Issue | Possible Cause | Recommended Action |
|---|---|---|
| Breaker fails to close | Mechanical obstruction | Inspect mechanism, remove debris |
| Gas pressure drop | Leakage in SF6 tank | Repair leak, refill SF6 |
| Excessive arcing during operation | Damaged contacts | Replace contacts, check alignment |
| Abnormal noise | Loose components | Tighten bolts, inspect for wear |
| Indicator shows incorrect status | Faulty indicator or mechanism | Replace indicator, recalibrate mechanism |
Regular inspection and maintenance reduce the likelihood of operational failures and extend equipment lifespan.
The LW36-72.5 circuit breaker is widely applied in:
High-voltage substations for electricity distribution.
Industrial facilities requiring reliable AC power interruption.
Renewable energy plants including wind and solar farms.
Railway electrification systems for traction power protection.
Its high breaking capacity, durability, and ease of maintenance make it a preferred choice for modern electrical networks.
The LW36-72.5 Porcelain Post High Voltage AC SF6 Circuit Breaker is a robust, reliable, and efficient solution for high-voltage power systems. With superior safety, technical performance, and global certifications, it ensures the protection and stability of electrical infrastructure. Proper installation, operation, and maintenance are key to maximizing its lifespan and performance.
This circuit breaker is ideal for substations, industrial applications, and any high-voltage environment where reliability and safety are paramount. Its compact design, low maintenance requirements, and advanced technology make it a valuable investment for utilities and industrial operators worldwide.
The LW36-72.5 Porcelain Post High Voltage AC SF6 Circuit Breaker 72.5kV offers reliable electrical protection for substations and industrial power systems. Featuring SF6 gas insulation, durable porcelain posts, and high breaking capacity, it ensures safe and efficient operation. Certified to IEC 62271-100, ISO 9001, and CE standards, this circuit breaker is ideal for modern electrical infrastructure with low maintenance requirements and long-term reliability.
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
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