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The power generator is important and precious apparatus in the power system. The protective relay must operate the circuit breaker instantaneously with high sensitivity when the fault occurs in the generator. According to previous research, the fault current of inter-fault in some situation is very large. But on the other faults, the fault current of inter-fault is so small that it is difficult to be identified by relay. The construction of large capacity generators, especially for hydroelectric power generator, is very complicated and differences each other. Besides that the difficulty and complicate exist in the calculation of the fault quantity and analysis of the sensitivity of the protection scheme, the difficulty exists in the verification the correctness of calculation algorithm too. In this paper, it was introduced the researching result about the inter-fault of the power generator both using the methods based on digital simulation and physical simulation. At the end of this paper, the comparison of these two methods was given. It shows the digital and physical simulation modes using in this paper can be used in the works of design, operation and research. (5 pages)