The LW35-126 outdoor self-blast high-voltage SF₆ circuit breaker is suitable for AC 50Hz (60Hz), 126kV power systems. It serves as a control and protection device for power systems, and can also be used as an interconnection circuit breaker.
The circuit breaker complies with the requirements of GB1984-2003 High-Volotage AC Circyit Breakers , IEC62271-100-2001 High-Volotage AC Circyit Breakers, and Technical Specifications for LW35-126 Self-Blast Circuit Breakers. Using SF₆ gas as insulation and arc-extinguishing medium and adopting the self-blast arc extinguishing principle, the circuit breaker is equipped with a new-type spring operating mechanism. It features strong breaking capacity, low operating power, and high reliability.
| No. | Item | Unit | Parameter | |
| LW35-126W/T3150-40（Normal） | LW35-126W/T3150-31.5（H），（For high-altitude areas） | |||
| 1 | Applicable environment | - | Normal | High-altitude areas- High-altitude applicable |
| 2 | Rated voltage | kV | 126/145 | 126/145 |
| 3 | Rated power-frequency withstand voltage (1min) | kV | To ground：K・230； Between breaks：K・(230+73) |
|
| 4 | Rated lightning impulse withstand voltage | kV | To ground：K・550； Between breaks：K・(550+103) |
|
| 5 | Power-frequency withstand voltage at zero SF₆ gas pressure (5min) | kV | 95 | |
| 6 | Rated frequency | Hz | 50 (60) | |
| 7 | Rated current | A | 3150 | |
| 8 | First-level series number | - | 1.5 | |
| 9 | Rated short-circuit breaking current | kA | 40 | 31.5 |
| 10 | Rated short-circuit making current (peak) | kA | 100 | 80 |
| 11 | Rated short-time withstand current | kA | 40 | 31.5 |
| 12 | Rated peak withstand current | kA | 100 | 80 |
| 13 | Rated short-circuit duration | s | 4 | 8 |
| 14 | Rated out-of-step breaking current | kA | 10 | |
| 15 | Proximity fault breaking current | kA | 90% Ik, 75% Ik | |
| 16 | Rated line-charging switching current | A | 31.5 | |
| 17 | Rated operating sequence | - | O-0.3s-CO-180s-CO | |
| 18 | Main circuit resistance | μΩ | ≤65 | |
| 19 | Rated SF₆ gas pressure (20°C gauge pressure) | MPa | 0.6 | 0.45 |
| 20 | Alarm minimum functional pressure (20°C gauge pressure)* | MPa | 0.55±0.015/0.50±0.015 | 0.40±0.015/0.34 |
| 21 | Annual SF₆ gas leakage rate | % | ≤0.5 | |
| 22 | SF₆ gas moisture content (V/V) | ppm | ≤150 | |
| 23 | Mechanical life | - | 6000/10000 | |
| 24 | Radio interference level | μV | ≤500 | |
| 25 | Creepage distance | mm | Between breaks：3906/3150； To ground：3906/3150 |
|
| 26 | SF₆ gas charge per unit | kg | 8 |
| No. | Item | Unit | Parameter |
| 1 | Auxiliary circuit voltage | V | DC220 or AC220, DC110, DC48 |
| 2 | Opening coil voltage/current | V/A | DC110/4; DC220/2; AC220/5; DC48/4 |
| 3 | Closing coil voltage/current | V/A | DC110/4; DC220/1.3; AC220/5; DC48/4 |
| 4 | Energy storage motor | - | - |
| Rated voltage | V | DC220 or AC220, DC110, DC48 | |
| Normal operating voltage range | V | 85%~110% | |
| Power | W | 720 | |
| 5 | Motor energy storage time | s | ≤20 |
| 6 | Heater and lighting circuit voltage | V | AC220 |
| 7 | Auxiliary switch rated voltage | V | DC220 or AC380 |
| 8 | Auxiliary switch rated current | A | 10 |
| 9 | Auxiliary switch contacts | - | 11 normally open + 11 normally closed |
| No. | Item | Unit | Parameter |
| 1 | Center distance between circuit breaker poles | mm | 1700 |
| 2 | Moving contact stroke | mm | 120 + 30 |
| 3 | Moving contact contact stroke | mm | 25 + 30 |
| 4 | Operating linkage stroke between breakers (chord length) | mm | 110 + 30 |
| 5 | Opening speed | m/s | 5.0±0.5 |
| 6 | Closing speed | m/s | 3.0±0.5 |
| 7 | Opening time | ms | ≤40 |
| 8 | Closing time | ms | 70±8 |
| 9 | Breaking time | ms | ≤60 |
| 10 | Close-open time | ms | 35~50 |
| 11 | Open-close time | ms | 300 |
| 12 | Three-phase opening asynchronism (time difference) | ms | ≤2 |
| 13 | Three-phase closing asynchronism (time difference) | ms | ≤3 |
The circuit breaker adopts a three-phase porcelain-column support structure (outdoor design), with three phases sharing one SRCT36-C spring operating mechanism (arranged centrally, with three-phase linkage), giving it a sleek and sophisticated appearance. Using SF₆ gas as insulation and arc-extinguishing medium, the SF₆ gas paths of the three phases are connected during operation, and a pointer type density relay is used to monitor its pressure and density. Thanks to the adoption of the self-blast arc-extinguishing principle and optimized design of the circuit breaker's motion system, mechanical efficiency is effectively improved, and operating power is minimized
The normal operating environment complies with GB/T11022-1999 Common Technical Requirements for High-Voltage Switchgear and Controlgear Standards, i.e.:a. Ambient temperature: -40°C ~ +40°C;b. Altitude: not exceeding 3000m;c. Wind speed: not greater than 34m/s;d. Daily temperature difference: not greater than 25°C;e. Solar radiation: not greater than 0.1W/cm2;f. Monthly average relative humidity: not greater than 90%;g. Seismic acceleration: horizontal s0.5g, verticals0.38g;h. Ice coating thickness: not greater than 10mm;i. Air pollution degree: not exceeding Class IV in GB5582;j. Installation site: Outdoor. If users have special requirements for the operating environment, please negotiatel separately with the manufacturer.
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