【作者】 吴春华；

【导师】 刘万顺；

【作者基本信息】 华北电力大学（北京） ， 电力系统及其自动化， 2003， 硕士

【摘要】 本文以现有变压器主保护理论为基础，引入电压量后，给出了瞬时功率、瞬时励磁电感的概念，提出了平均有功功率差动原理、瞬时有功功率频域特性原理、平均无功与有功比值原理来区分励磁涌流和短路故障，尤其是瞬时有功功率频域特性原理回避了原有功率差动保护整定复杂的难点，而且具有一定的抗超饱和现象的能力；此外，利用瞬时励磁电感的变化特性，能够从本质上描述出变压器的运行状态，从而快速而可靠的识别出变压器轻微匝间短路故障。最后针对变压器保护的特殊性，提出了利用模糊理论来实现变压器的保护逻辑。很好的调整了灵敏性与可靠性之间的矛盾关系。通过大量的EMTP仿真和混合仿真试验证明了以上提出的变压器保护原理的正确性。本论文得到了“国家自然科学基金”项目《基于励磁支路非线性的变压器新原理的研究》（项目号50277012）的资助。更多还原

【Abstract】 Based on the existing theories of transformer protection, the voltage is introduced in this paper. Furthermore we put forward the conception of instantaneous power and instantaneous excitation inductance. After that the new theories that are used to discriminate the inrushing and faults are advanced here. They are power difference theory, the ratio of reactive power and active power theory, instantaneous power frequency analysis theory and instantaneous excitation inductance characteristic theory. The phenomenon of over_saturation has no influence to instantaneous power theory. And the instantaneous excitation inductance theory can describe the function state of transformer in nature. In the end it is proved that the new theories are correct by a mass of test such as EMTP simulation and mixed simulation. This paper is supported by "Nation Natural Science Fund— Study on New Principle of Transformer Protection Based on the Nonlinear Behavior of Energizing Circuit", The serial number is 50277012 。更多还原