Stator winding single-phase ground fault of motor is one of the most common generator fault which often is the omen of the more serious winding internal short fault, so the paper proposed a three-phases grounding fault simulation methods of motor in the electromagnetic transient analysis software PSCAD / EMTDC environment. The method used a mathematical model of three-phases grounding fault instead of real power system in the power system simulation software, then tested and researched the operation situation of simulation system with numerical method. This model can not only simulate the transient state process and the stable state process of the generator fault, but also can reveal the fault characteristics of generator transient operation and the change rule of each fault in the transient process. The method may greatly reduce the occurrence probability of the internal short trouble and reduce loss which caused by the grounding fault. Thus, it verifies the effectiveness and correctness of the EMTDC motor model and algorithm, and provided the effective simulation platform for the further research on the motor fault diagnosis and protection.%在电磁暂态分析软件PSCAD/EMTDC环境中,对电动机两相接地故障进行仿真,以三相接地故障的数学模型代替实际电力系统,用数值方法对系统进行运行试验和研究.该模型不仅可以对电动机故障的瞬态和稳态过程进行仿真,而且能够揭示电动机故障瞬态的运行特征及瞬态过程中各个故障量的变化规律.验证了EMTDC电动机模型和算法的有效性和正确性,为深入研究电动机故障诊断和保护提供了有效的仿真平台.
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