CONTACT MATERIALS FOR INTELLIGENT FRAME CIRCUIT BREAKER

Technoloyg research and test of contact materials used for the intelligent frame circuit breakernewly designed by our country. The silver-tungsten and silver-nickel graphite concocts with high properties pre-sintered tungsten skeleton have been made through a lot of experiments. After high currentarc burning loss and electric erosion model tests,better dynamic and static varieties have been decided.It has been proved by trial running type experiments that asymmetry paired contacts of AgW50/Ag-Ni25C2 can meet various property targets of circuit. The limited short circuity breaking capacityreached 380V, 65kA; 660V, 50kA with obvious energy-saving results.