The LW38-126kV Outdoor High Voltage SF₆ Circuit Breaker is engineered for reliable performance in 126kV power systems, even in extreme climates. It offers outstanding electrical performance, with a rated breaking current of up to 40kA and impulse withstand voltage up to 550kV. Its robust design ensures long mechanical life and high fault tolerance.
This circuit breaker is ideal for critical outdoor applications, combining superior insulation with a sealed SF₆ system that minimizes leakage and moisture. It supports efficient and safe operation with advanced switching capabilities and precise gas pressure monitoring, ensuring system stability and maintenance convenience in transmission and substation environments.
| Type | LW38-126W / T3150-40 , LW38-126W / T3150-31.5（H） |
| Applicable Environment | Normal / Suitable for Extremely Cold Regions |
| Rated Voltage | 126 kV |
| Rated Power Frequency Withstand Voltage (1min) To Ground | K·230 kV |
| Rated Power Frequency Withstand Voltage (1min) Across Interruption Gap | K·(230+73) kV |
| Rated Lightning Impulse Withstand Voltage (To Ground) | K·550 kV |
| Rated Lightning Impulse Withstand Voltage (Across Interruption Gap) | K·(550+103) kV |
| Power Frequency Withstand Voltage at Zero SF₆ Gauge Pressure (5min) | K·95 kV |
| Rated Frequency | 50 Hz |
| Rated Current | 3150 A |
| First-Pole-to-Trip Factor | 1.5 |
| Rated Short-Circuit Breaking Current | 40 / 31.5 kA |
| Rated Short-Circuit Making Current (Peak) | 100 / 80 kA |
| Rated Short-Time Withstand Current | 40 / 31.5 kA |
| Rated Peak Withstand Current | 100 / 80 kA |
| Rated Short-Circuit Duration | 4 s |
| Rated Out-of-Step Breaking Current | 10 / 8 kA |
| Near-Fault Breaking Current | 90%Ik, 75%Ik kA |
| Rated Line Charging Switching Current | 31.5 A |
| Rated Operating Sequence | O-0.3s-CO-180s-CO |
| Main Circuit Resistance | ≤35 μΩ |
| Rated SF₆ Gas Pressure at 20℃ (Gauge Pressure) | 0.6 / 0.45 MPa |
| Alarm / Minimum Functional Pressure at 20℃ (Gauge Pressure) | 0.55±0.015 / 0.50±0.015 MPa , 0.40±0.015 / 0.34±0.015 MPa |
| Annual SF₆ Gas Leakage Rate | ≤0.5 % |
| SF₆ Gas Moisture Content | ≤150 ppm |
| Mechanical Endurance | 6000 or 10000 operations |
| Radio Interference Level | ≤500 μV |
| Creepage Distance (Across Interruption Gap) | 3906 / 3150 mm |
| Creepage Distance (To Ground) | 3906 / 3150 mm |
| SF₆ Gas Mass per Breaker | 8 kg |
| Breaker Total Mass per Unit | 1700 kg |
The circuit breaker adopts a three-phase porcelain post structure, designed for outdoor use. A single SRCT36-C spring operating mechanism is centrally arranged and shared by the three phases, enabling simultaneous operation, resulting in a novel and refined appearance. The circuit breaker uses SF₆ gas as the insulating and arc-quenching medium. During operation, the SF₆ gas chambers of the three poles are interconnected and monitored by a pointer-type density relay for pressure and density.
Due to the adoption of a self-energy arc extinction principle and the optimized design of the circuit breaker’s motion system, the mechanical efficiency is effectively improved, and the operating force is minimized to the greatest extent.
The normal service environment conditions comply with the provisions of GB/T11022-1999 Common Technical Requirements for High Voltage Switchgear and Controlgear Standards, namely:
Ambient temperature: -40°C to +40°C
Altitude: Not exceeding 3000 m
Wind speed: Not greater than 34 m/s
Daily temperature variation: Not greater than 25°C
Solar radiation intensity: Not greater than 0.1 W/cm²
Monthly average relative humidity: Not greater than 90%
Seismic acceleration: Horizontal not greater than 0.2 g, vertical not greater than 0.1 g
Ice covering thickness: Not greater than 10 mm
Air pollution level: Not exceeding Level IV as per GB5582
Installation location: Outdoor
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