Large transient overvoltages can be caused by the switching operation of vacuum circuit breakers of induction motors. In order to analyze the switching transient overvoltage and use an appropriate protective method in the power system of floating production storage and offloading (FPSO) vessel, the accurate models of electrical equipments are necessary. In this study, vacuum circuit breakers, generators, cables, busbars, surge arresters and induction motors are modeled in Alternative Transient Program-Electromagnetic Transients Program (ATP-EMTP) software. The switching transient overvoltages of four typical induction motors under the starting, the full load and the light load working conditions in the power system of the selected FPSO vessel are analyzed. A suitable protection against the switching transient overvoltage is included in this study.