【作者】 江海峰；

【导师】 孙鸣；

【作者基本信息】 合肥工业大学 ， 电力系统及其自动化， 2004， 硕士

【摘要】 针对当前电力系统中变压器保护由于励磁涌流鉴别理论不完善而导致的误动率相对较高的问题，论文在分析了变压器励磁涌流特性和有功损耗的基础上，提出了用变压器正序有功功率差动作为区别励磁涌流和故障电流的判据，并以成熟的比率制动差流保护作为内外部故障判据的变压器主保护。该励磁涌流判据采用了变压器非线性模型，能更好的反映变压器的工作状态，论文用理论分析和数字仿真作了详细证明。论文同时设计出了一种基于该保护原理的变压器微机保护样例，详细说明了该套微机保护的软硬件配置。更多还原

【Abstract】 In order to improve the behavior of transformer protection that is incomplete at present in distinguishing magnetizing inrush current from fault current, the paper puts forward a kind of new principle of transformer differential protection after analyzing the characteristic of magnetizing inrush and active power consume of transformers. This protection uses differential protection based on positive sequence active power as a criterion to discriminate internal faults from magnetizing inrush, and ratio restraint differential current protection as a signal to touch off the protection. The criterion that is based on nonlinear mode of transformers can better reflect the state of transformers that have been proved by academic analysis and EMPT emulation. The paper also gives an instance to realize this protection and explains its software and hardware in details.更多还原