Isolated phase bus (IPB) is chosen as the structure of the enclosed ac busbar for ITER PF converter, which is used to connect the rectifier transformer and the converter unit of the ITER PF converter module due to its electromagnetic shielding ability. The IPB should withstand huge fault currents, of which the peak value of the current can reach 350 kA, in the worst fault condition according to the design requirement. In order to verify the dynamic stability of the IPB, a momentary current test for ITER PF IPB is necessary. In this paper, the momentary current test of the IPB applied for ITER PF converter based on ITER AC test platform is designed and carried out in detail. The effectiveness of the test scheme is verified by the results of both the simulation and the test. The test scheme presented in this paper is of great value for conducting momentary current tests of electrical equipment with large alternating currents.