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As smart grid is proposed in the national development strategy, the development of the intelligent substations is developing rapidly, which puts forward higher requests for the comprehensive quality of power system staff. This paper introduces a three-dimensional simulation system of substation used for teaching and training. Firstly, this paper briefly describes its software and hardware environment, introduces its function for teaching and training examination, which contains two-dimension and three-dimensional simulation. Secondly, by using three cases such as the substation busbar earth-fault simulation, substation inspection simulation and actual operation process simulation, it explains the operation flow of this system, as well as the three-dimensional characteristics and application advantages, aiming at providing training for operators and students, to improve their practical skills. This system has good compatibility, authenticity and scalability, can meet the training requirements of the power industry staff in the development of intelligent substation at the present stage, and has a good practical application effect [ABSTRACT FROM AUTHOR]