LW36-126T (W)/3150-40 Outdoor High Voltage SF6 Dead Tank Circuit Breaker
The LW36-126T (W)/3150-40 Outdoor High Voltage SF6 Dead Tank Circuit Breaker is a reliable transmission-class circuit breaker developed for 72.5kV and 126kV, 50Hz three-phase AC power systems. It combines advanced SF6 switching technology with a compact dead tank structure, providing dependable circuit interruption, protection, and control performance for high-voltage substations and transmission networks.
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The LW36-126T (W)/3150-40 Outdoor High Voltage SF₆ Dead Tank Circuit Breaker is a reliable transmission-class circuit breaker developed for 72.5kV and 126kV, 50Hz three-phase AC power systems. By integrating the circuit breaker and current transformer (CT) into a compact dead tank design, it provides dependable switching, protection, and control performance for substations and high-voltage transmission networks.
The interrupter chamber is horizontally installed inside a grounded aluminum alloy enclosure and driven by the CT26 spring operating mechanism. With SF₆ gas serving as both the insulation and arc-extinguishing medium, the circuit breaker delivers excellent dielectric performance, strong short-circuit interruption capability, and extended electrical service life.
Through CNC precision manufacturing and the use of high-quality bearings from internationally recognized suppliers, including IKO, INA, and SKF, the LW36-126T ensures outstanding mechanical stability and operational reliability, with a mechanical endurance of up to 10,000 operations.
The LW36-126T SF₆ Dead Tank Circuit Breaker is widely applied as a transmission line breaker, transformer feeder breaker, bus coupler breaker, and capacitor bank switching breaker in utility substations, power transmission systems, and high-voltage grid applications.
Model and meaning
Features
Integrated Dead Tank Structure
The LW36-126T Outdoor SF₆ Dead Tank Circuit Breaker features a compact dead tank design, with the interrupter chamber installed inside a grounded aluminum alloy enclosure. The integrated current transformer (CT) design eliminates the requirement for external CT installation, helping reduce equipment footprint, simplify primary circuit connections, and optimize overall substation construction costs.
Key advantages include:
- Integrated circuit breaker and CT configuration
- Compact equipment layout
- Enhanced operational safety
- Simplified substation design
- Reduced installation complexity and project time
Advanced SF6 Arc-Extinguishing Technology
The LW36-126T uses SF6 gas as both the insulation and arc-quenching medium, ensuring reliable switching performance in high-voltage transmission applications.
Main features include:
- Excellent dielectric insulation capability
- High short-circuit current interruption performance
- No restrike during capacitive current switching
- Extended electrical endurance
- Stable operation under demanding fault conditions
The optimized interrupter design and advanced arc-control technology improve switching efficiency while minimizing operating energy requirements.
High Mechanical Reliability
The major mechanical components of the LW36-126T are manufactured through precision CNC machining processes to ensure high accuracy and consistent quality.
Equipped with premium bearings from internationally recognized brands such as IKO, INA, and SKF, the breaker provides:
- Smooth mechanical operation
- Reduced transmission friction
- Reliable synchronization performance
- Long-term mechanical stability
- Mechanical endurance of up to 10,000 operations
Excellent Outdoor Corrosion Protection
Designed for continuous outdoor operation, the LW36-126T incorporates multiple corrosion-resistant protection measures, including:
- Stainless steel operating mechanism cabinet
- Hot-dip galvanized structural components
- Hot-dip galvanized fastening parts
- High-strength support structure
- Strong resistance against humidity, salt spray, and industrial contaminants
The anti-pollution (W) version is especially suitable for coastal areas and industrial environments with high pollution levels.
Superior Current Carrying Performance
The LW36-126T successfully completes temperature rise tests at 120% of rated current (3,780A), providing sufficient thermal margin for long-term continuous operation.
Additional benefits include:
- Low temperature rise characteristics
- Stable contact resistance
- Excellent overload capability
- Reliable continuous current transmission performance
Simplified Installation and Low Maintenance
The compact structure of the LW36-126T simplifies transportation, installation, commissioning, and routine maintenance processes.
Additional features include:
- Centralized CT26 spring operating mechanism
- Online SF₆ gas density monitoring system
- Fast motor charging time (≤15 seconds)
- Reduced maintenance requirements
- Extended inspection intervals
Technical Data
Electrical Ratings
| Item | Unit | Parameter |
| Rated Voltage | kV | 126 |
| Rated Current | A | 3150 |
| Rated Frequence | Hz | 50 |
| Rated Short-Circuit Breaking Current | kA | 40 |
| Rated Short-Circuit Making Current (Peak) | 100 | |
| Rated Peak Withstand Current | 100 | |
| Rated 4s Short-Time Withstand Current | 40 | |
| First-Pole-to-Clear Factor | / | 1.5 |
| Rated operating sequence | / | O–0.3s–CO–180s–CO |
| Out-of-Phase Breaking Current | kA | 10 |
| Line Charging Switching Current | A | 31.5 |
| Mechanical Life | Times | 10000 |
| Radio Interference Voltage | μV | ≤500 |
Insulation Performance
| Item | Specification |
| Power Frequency Withstand Voltage (to Ground) | K × 230kV |
| Power Frequency Withstand Voltage (Across Open Contacts) | K × 265kV |
| Lightning Impulse Withstand Voltage (to Ground) | K × 550kV |
| Lightning Impulse Withstand Voltage (Across Open Contacts) | K × 630kV |
| Power Frequency Withstand Voltage at Zero SF6 Pressure(5min) | K × 95kV |
| Creepage Distance | 3906mm / 3150mm |
Altitude Correction Factor
| Installation Altitude | K Factor |
| 2000m | 1.13 |
| 3000m | 1.28 |
Mechanical Performance
| Item | Specification |
| Pole Spacing | 1750 mm |
| Contact Stroke | 120 ±3 mm |
| Contact Travel | 25 ±2 mm |
| Opening Speed | 4.2–5.0 m/s |
| Closing Speed | 2.2–3.0 m/s |
| Opening Time | ≤40 ms |
| Closing Time | ≤100 ms |
| Total Breaking Time | ≤60 ms |
| CO Time | ≤80 ms |
| O-CO Interval | 300 ms |
| Three-Phase Opening Synchronization | ≤2 ms |
| Three-Phase Closing Synchronization | ≤3 ms |
CT26 Spring Operating Mechanism
| Item | Specification |
| Auxiliary Voltage | DC110V / DC220V |
| Closing & Trip Coil Voltage | DC110V / DC220V |
| Energy Storage Motor | AC110V / AC220V / DC110V / DC220V |
| Motor Operating Voltage | 85–110% Rated Voltage |
| Motor Power | 600W |
| Charging Time | ≤15s |
| Heater Voltage | AC220V |
| Auxiliary Switch Voltage | AC220V / DC220V |
| Auxiliary Switch Current | 10 A |
| Auxiliary Contacts | 10 NO + 10 NC |
SF6 Gas Characteristics
| Item | Specification |
| Rated Gas Pressure (20°C) | 0.5 MPa |
| Alarm Pressure | 0.45 ±0.03 MPa |
| Annual Leakage Rate | <0.5% |
| Moisture Content | ≤150 × 10⁻⁶ (V/V) |
| SF₆ Gas Weight | 15 kg |
Dimensions & Installation
| Item | Specification |
| Total Weight | 2200kg |
| Wind Load Area | 4.7m² |
| Foundation Bolts | M30 × 1100 mm |
| Support Structure | 1200 mm Steel Channel Base |
Overall and mounting dimensions(mm)
Main Components
| Component | Description |
| Primary Terminal | Aluminum Alloy |
| Bushing | High-Strength Porcelain |
| Current Transformer | Built-in Bushing CT |
| Interrupter | Horizontal SF₆ Dead Tank Chamber |
| Operating Cabinet | CT26 Spring Mechanism with Secondary Terminal Block |
| Support Frame | Hot-Dip Galvanized Steel |
| Ground Terminal | One Ground Pad per Support |
| Heater | Optional Depending on Ambient Temperature |
Typical Applications
The LW36-126T SF6 Dead Tank Circuit Breaker is designed for reliable operation in various high-voltage transmission and substation applications, including:
- 72.5kV and 126kV transmission substations
- Utility transmission and distribution networks
- Transformer feeder protection systems
- Bus coupler applications
- Capacitor bank switching systems
- Industrial power substations
- Renewable energy grid connection projects
- Heavy industrial power facilities
- Coastal areas and high-pollution environments
With its compact dead tank structure, advanced SF6 switching technology, and reliable outdoor performance, the LW36-126T provides an effective solution for modern power grid protection and switching requirements.
Why Choose the LW36-126T SF6 Dead Tank Circuit Breaker?
The LW36-126T combines advanced design features and reliable performance for high-voltage power applications:
- Integrated dead tank circuit breaker with built-in current transformer (CT)
- Advanced SF₆ insulation and arc-extinguishing technology
- Rated voltage up to 126kV
- Rated current up to 3150A
- Short-circuit breaking capacity up to 40kA
- High-quality IKO, INA, and SKF bearings for enhanced mechanical reliability
- Mechanical endurance of up to 10,000 operating cycles
- Stainless steel control cabinet and hot-dip galvanized steel structure
- Excellent corrosion resistance for demanding outdoor conditions
- Online SF₆ gas density monitoring system
- Rapid energy storage time within 15 seconds
- Simplified installation and reduced maintenance requirements
- Suitable for transmission substations, utility networks, capacitor banks, and transformer switching applications
Customization Services
Dxellence provides comprehensive customization solutions to support different utility, EPC, and industrial power project requirements.
Available customization options include:
- Various rated current configurations
- Anti-pollution (W) design options
- Customized control voltage solutions
- Auxiliary contact configurations
- Current transformer ratios and accuracy classes
- OEM and private label manufacturing services
- Factory Acceptance Testing (FAT)
- Complete technical documentation and engineering support
Our engineering team can customize the LW36-126T SF6 Dead Tank Circuit Breaker according to IEC, ANSI, and project-specific technical requirements, ensuring reliable integration into global high-voltage transmission and power distribution projects.
