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随着核电技术的发展,核电厂发电机的单机容量愈来愈大,鉴于定子接地故障较高的发生几率,AP1000设计导则明确要求发电机定子接地保护采用双重化保护。制订合理的定子接地保护方案,提出改进优化AP1000核电厂保护配置,引入AP1000发电机注入式定子接地保护方案,利用MATLAB的Simulink仿真软件包,建立了注入式定子接地保护的仿真模型,验证了注入式定子接地保护的有效性,并分析了发生接地故障时,过渡电阻对保护的影响,为今后AP1000机组的设计及运行提供参考。
With the development of nuclear power technology, the stand-alone capacity of nuclear power plant generators is getting larger and larger. In view of the high occurrence probability of stator ground faults, the AP1000 design guideline explicitly requires dual grounding protection of generator stator. A reasonable scheme of stator earth protection is proposed, the protection configuration of AP1000 nuclear power plant is optimized and improved, and the AP1000 generator stator ground protection scheme is introduced. By using Simulink simulation software package of MATLAB, a simulation model of stator grounding protection is established. The effectiveness of the stator earth protection and the influence of the transition resistance on the protection in the event of a ground fault are analyzed to provide references for the design and operation of the AP1000 unit in the future.