During the start-up commissioning of No.1 unit (350 MW) in India Kamalanga Power Plant, two-phase short-circuit fault occurred at generator outlet during the process of synchronization. The fault causes were analyzed based on fault records, computer messages and other fault information. After the replacement of circuit breaker, the detection test for main transformer, the circuit breaker performance test, short circuit and open circuit performance test for generator, as well as the load test for units were carried out, and the results were compared with the detection test results before fault, in order to confirm that the main transformer and generator could be able to put into operation with the safety and reliability not being changed. Finally, countermeasures were proposed according to the problems exposed in the incident.