Previous
Next
LW30-72.5 Outdoor High-Voltage SF₆ Circuit Breaker
The LW30-72.5 outdoor SF₆ circuit breaker is designed for 72.5kV transmission and substation applications. Available in tank-type or porcelain-column structures, it leverages self-energy arc extinguishing technology and long-life mechanical design to provide reliable operation in medium- and high-voltage networks. The breaker is ideal for high-demand switching scenarios such as capacitor bank operations.
Core Operating Principle
The breaker uses a “thermal expansion + auxiliary blow” self-energy arc extinguishing system, with:
Optimized arc contact and electric field design, including shielding on the contact fingers for uniform field distribution.
Split-type gas cylinder utilizing arc energy to assist in quenching, reducing operating force, and restrike probability.
Fast dielectric recovery is suitable for switching capacitor banks under transient recovery voltage.
It pairs with the CT26 fully-spring operating mechanism, storing energy directly from the closing arm to the trip spring, reducing transmission losses and maintenance requirements. The oil-free, gas-free design aligns with modern high-voltage equipment standards.
Key Technical Specifications
1. Electrical & Mechanical Specifications
| Parameter | Specification |
|---|---|
| Rated Voltage | 72.5kV |
| Rated Frequency | 50/60Hz |
| Rated Current | 1600–4000A (typical 3150A) |
| Short-Circuit Breaking Current | 25–40kA, >20 full-capacity operations |
| Electrical Life | Excellent, supports repeated high-current switching |
| Mechanical Life | 10,000 operations |
| Operating Sequence | O – 0.3s – CO – 180s – CO; full operation within 3 cycles |
| Opening / Closing Time | Rapid response, ≤3 cycles |
| Transmission Mechanism | Single-side drive; integrated spring & buffer; short transmission chain |
2. SF₆ Gas & Sealing
| Parameter | Specification |
|---|---|
| Rated Gas Pressure (20°C) | ~0.4MPa |
| Sealing Method | Double O-ring + sealant |
| Annual Leakage Rate | Strictly controlled, very low risk |
3. Structure & Materials
| Feature | Description |
|---|---|
| Core Structure | Tank-type or porcelain-column; three-phase linked on a welded base frame; compact, easy transport |
| Enclosure | Aluminum alloy, rust-resistant |
| Mechanism Box | Stainless steel |
| Fasteners | Hot-dip galvanized |
| Flanges | Dual-seal (water + gas protection) |
| Transmission Design | Single-side transmission; short drive chain; reduced mechanical loss |
4. Environmental Adaptability
| Condition | Specification |
|---|---|
| Ambient Temperature | –40°C to +55°C |
| Altitude | Up to 3000m |
| Wind Speed | ≤35 m/s |
| Ice Thickness | ≤20mm |
| Seismic | Up to 9° intensity |
| Pollution Level | III (outdoor, humid, dust, ice-prone areas) |
5. Applications
750kV / 550kV / 330kV substations
Transmission & distribution lines
Large-scale wind and solar power stations
Capacitor bank switching
New substation construction and old station retrofits
Remote or high-density maintenance areas
6. Key Selling Points
Self-energy arc extinguishing for fast, safe interruption
Low operating force, high mechanical & electrical life
Compact, corrosion-resistant, and weatherproof structure
Excellent dielectric recovery and restrike suppression
Suitable for harsh outdoor environments (ice, wind, seismic, pollution)
Long maintenance intervals, up to 10 years
7. Export & Market
The LW30-72.5 is exported to Russia, India, and other international markets, providing stable and reliable operation for high-voltage networks worldwide.
Contact Us
Related Products
