Abstract: A 100kV/2A threephase constantcurrent repetitiverate charging equipment was designed and constructed. A threephase LC converter is adopted as constantcurrent power source. Six Insulated Gate Bipolar Transistors(IGBTs) are connected in parallel to control the stop of charge. A Programmable Logical Controller(PLC) is the central element of the control unit. The equipment is used in the repetitiverate discharge features test of the switch. It works stably under the conditions of 2A charging current, 10Hz operating voltage, 100kV repetitiverate and 1μF capacitor.