交流發電機 異常狀態時의 過度現像에 關한 硏究

Abstract

It is common knowledge amongst electrical and marine engineers that short-circuit in electrical system may cause large mechanical torque on generator and prime mover. However, It is not so widely known that faulty synchronizing of generators may cause even higher torques than that of short-circuit. In this study, the transient phenomenon related to the short-circuit and parallel running of synchronous generators are compared and analysed. Computer simulation results show importance of synchronizing when parallel running of synchronous generators. Maximum transient torque and current take place in case of 120˚phase difference parallel running of generators and may develop higher torque than short- circuit according to a condition of synchronizing. When synchronizing in power system using only two generators higher torque and current are occurred to Master, but using multimachine system higner torque and current are occurred to Slave. Short-circuit of marine generator is not frequently happened but faulty synchronizing takes place frequently, therefore, it is necessary to consider these phenomena for designing generators.