MULTIPHASE GAS EXPANSION CIRCUIT BREAKER FOR A GAS-INSULATED METALCLAD CELL

摘要

A circuit breaker includes a plurality of poles disposed parallel side by side in a sealed enclosure filled with SF6 insulating gas. The housing of each arc extinguishing chamber comprises a metal shielding wall designed to neutralize the influence of the magnetic stray fields of the neighbouring poles. The wall can be made of conducting or ferromagnetic material, and enables correct entering of the arc favouring the expansion effect of the gas. The invention finds an application in medium voltage electrical distribution substation.