LW36-110 (126) High-Voltage SF6 Circuit Breaker
LW36-110 (126) High-Voltage SF6 Circuit Breaker is designed for AC 50Hz high-voltage power transmission and distribution systems with rated voltages of 110kV and 126kV. Using SF6 gas as the arc-extinguishing and insulation medium, it provides reliable fault interruption, excellent insulation performance, and stable mechanical operation. As a key switching and protection device, it is widely used in substations, transmission lines, and grid interconnection systems to ensure safe and reliable operation of high-voltage power networks.
Get a QuoteOverview
The LW36-110 (126) High-Voltage SF6 Circuit Breaker is designed for AC 50Hz power transmission and distribution systems with rated voltages of 110kV and 126kV. As a key switching and protection device, it provides reliable fault interruption, power system control, and interconnection functions, ensuring stable operation in various high-voltage electrical networks.
Features
High Short-Circuit Breaking Capability
The LW36-110 (126) SF6 circuit breaker provides excellent fault interruption performance, with a rated short-circuit breaking current of up to 40kA. It is capable of safely clearing high fault currents, ensuring reliable protection for high-voltage transmission and distribution systems.
Low-Energy Operating Mechanism
Equipped with a CT-30 spring operating mechanism, the circuit breaker features efficient energy utilization, stable mechanical operation, and fast response characteristics. The optimized operating system reduces energy consumption while improving overall operating reliability.
Long Mechanical Service Life
The robust mechanical structure enables a mechanical endurance of ≥3,000 operations, ensuring long-term stable operation under normal switching conditions and reducing maintenance frequency throughout the equipment lifecycle.
Reduced Maintenance Requirements
The reliable SF6 insulation system and optimized structural design minimize routine maintenance requirements, helping reduce equipment downtime and overall operation and maintenance costs.
Strong Environmental Adaptability
The LW36-110 (126) is designed to operate reliably under various outdoor conditions. Its flexible configuration and stable electrical performance allow it to adapt to complex power networks and demanding installation environments.
Product Structure and Operating Principle
Three-Phase Porcelain Post Structure
The circuit breaker adopts a three-phase porcelain post structure with a single spring operating mechanism. The operating mechanism provides synchronized control of all three phases, ensuring coordinated opening and closing performance.
SF6 Insulation and Arc-Extinguishing Technology
The LW36-110 (126) utilizes SF6 gas as the insulation and arc-extinguishing medium. The arc-extinguishing process is optimized according to different current conditions:
- High current interruption: The high-temperature gas generated by the arc enters the expansion chamber, where rapid cooling and gas flow effectively extinguish the arc.
- Low current interruption: The compressed SF6 gas generated by the pressure chamber provides sufficient airflow to achieve reliable arc extinction.
This dual-mode arc-extinguishing design ensures efficient interruption performance across a wide range of operating conditions.
SF6 Gas Density Monitoring System
The circuit breaker is equipped with a pointer-type SF6 density relay, which continuously monitors gas pressure conditions in real time. The monitoring system helps maintain insulation reliability and provides early indication of abnormal SF6 gas conditions, improving operational safety.
Technical Data
Electrical & Mechanical Parameters
| Item | Unit | Parameter |
| Rated Voltage | kV | 110 / 126 |
| Rated Current | A | 3150 |
| Rated Short-Circuit Breaking Current | kA | 40 |
| Rated Short-Circuit Duration | s | 3 |
| Mechanical Life | Times | ≥3000 |
| Protection Level | / | IP54 |
| Operating Mechanism | / | CT-30 Spring Mechanism |
Environmental Conditions
| Parameter | Value |
| Ambient Temperature | -25°C to +40°C (customizable to -40°C) |
| Altitude | ≤2500m (can adapt to 2000m) |
| Wind Speed | ≤34 m/s |
| Daily Temperature Variation | ≤25°C |
| Solar Radiation | ≤1000 W/m² |
| Seismic Resistance | Earthquake level 8 (horizontal 0.2g, vertical 0.1g) |
| Ice Thickness | ≤10mm |
| Pollution Level | ≤ Class III (GB/T 5582) |
| Monthly Average Relative Humidity | ≤90% |
Typical Applications
The LW36-110 (126) SF6 circuit breaker is widely used in high-voltage power transmission and distribution systems, providing reliable switching, protection, and fault interruption functions.
It is commonly applied in transmission and distribution substations as a main protection device for transformers, feeders, and transmission lines. The circuit breaker can also be used as a tie breaker for grid interconnection applications, ensuring safe and stable power exchange between different sections of the power network.
With its reliable insulation performance and strong environmental adaptability, the LW36-110 (126) is suitable for outdoor installations in complex operating conditions, including areas with harsh climates and high pollution levels.
Applicable Standards and Compliance
The LW36-110 (126) SF6 circuit breaker is designed and manufactured in accordance with recognized national and international standards, ensuring reliable electrical performance, mechanical durability, and operational safety.
The product complies with:
- GB1984-2003 — AC High-Voltage Circuit Breakers
- IEC 62271-100 — High-Voltage AC Circuit Breakers
Compliance with these standards ensures compatibility with mainstream 110kV and 126kV power transmission systems and supports reliable operation in modern high-voltage grid applications.
