Product introduction

The LW58-252(W) outdoor self-energy high-voltage SF₆ circuit breaker is designed for 252kV, 50Hz AC power systems, serving as a critical control and protection device for power grid interconnections. Utilizing SF₆ gas for arc quenching and insulation, it features a self-energy power arc extinguishing double-action interrupter structure paired with a new-type spring operating mechanism. Renowned for its robust switching capability, low operating power, low noise, and high reliability, its technical indicators align with advanced domestic and international counterparts.

This three-phase SF₆ circuit breaker upgrades from single-pole, single-mechanism operation to a three-phase mechanical linkage system driven by a single mechanism. This design reduces mechanical complexity, enhances three-phase linkage reliability, and eliminates the risk of single-phase misoperation.

Main characteristic

• Self-Energy Arc Extinguishing Technology: The double-action structure ensures stable breaking capacity under diverse loads.

• High Operational Efficiency: Requires minimal operating power, with a mechanical life cycle of up to 10,000 cycles for prolonged reliability.

• Superior Contact Design: Copper-tungsten arc contacts use integral sintering, withstanding high temperatures, minimal arc erosion, and over 20 full breaking operations.

Reliable Sealing & Insulation:

• Annual SF₆ gas leakage rate < 0.5% via precision sealing technology.

• Stringent dehumidification processes ensure SF₆ moisture content far below industry standards.

• High insulation level with creepage distance > 31mm/kV.

Advanced Materials:

• Arc extinguishing chamber valve plates use lightweight zinc-base alloy for stable gas dynamics and breaking performance.

• Imported PTFE-composite nozzles offer excellent ablation resistance and consistent arc quenching.

• Premium Components: Secondary circuit electrical units and SF₆ density relays are high-quality impact-resistant or joint-venture products.

• Pure Spring Operating Mechanism: Forged from high-strength alloy steel, key components resist wear, ensuring low failure rates during frequent operations.

Main technical parameters

Instructions on placing orders  

• Model and format of the circuit breaker;

• Rated electrical parameters (voltage, current, breaking current, etc);

• Working conditions for using (environment temperature, altitude, and environment pollution level);

• Rated control circuit electrical parameters (Rated voltage of energy-store moter and Rated voltage of opening, closing coil);

• Names and quantities of spare items needed, parts and special equipment and tools (to be otherwise ordered);

• The wire connecting direction of the primary upper terminal.