On November9, the800 kV/80 kA large-capacity circuit breaker, jointly developed by State Grid Shaanxi Electric Power Company Limited, Henan Pinggao Electric Co., Ltd., and other partners, successfully completed a technical evaluation, reaching a world-leading standard。

800 kV/80 kA Circuit Breaker Sample

800 kV/80 kA Circuit Breaker under Capacity Testing

　　During the development of the800 kV/80 kA circuit breaker, the project faced challenges such as a60 percent increase in short-circuit current energy, a27 percent rise in recovery voltage rate, and a significant improvement in the ablation resistance of key components. The team innovatively established a high-precision simulation model for the full switching process, built a state-of-the-art arc measurement system to accurately characterize high-voltage, high-current arcs, and successfully developed the world's first800 kV/80 kA dual-breaker and arc-quenching chamber. In addition, they pioneered ablation-resistant graphene contact materials to meet a20-cycle electrical lifespan and optimized the operating mechanism and buffer structures, overcoming critical challenges in high-capacity switching coordination。

Arc-quenching Chamber of the800 kV/80 kA Circuit Breaker

　　"The new circuit breaker achieves world-leading performance specifications while maintaining the same dimensions as current equipment, enabling direct replacement and upgrades and markedly improving the efficiency and economic viability of grid expansion projects," said Sheng Yong, Chief Expert of State Grid Shaanxi Electric Power Company Limited. Upon commissioning, the device will significantly strengthen the Northwest Power Grid's capacity to cope with extreme short-circuit currents, safeguard the stability of energy cluster transmission networks, and offer robust equipment support to China's main power grid。

责任编辑：王丽莎