电力变压器是电力系统中的重要设备，它的安全运行关系到整个电力系统的稳定运行，所以对变压器保护措施就显得尤为重要；由于变压器自身特点和电力系统的复杂性，使得现有变压器差动保护动作的正确率仍远远小于差动保护在线路上的应用。针对这一点，本文将结合目前现有的变压器差动保护判据，来研究一种性能更佳、基于DSP平台上的自适应变压器差动保护。 论文通过分析国内外现有电流差动保护判据的优缺点，根据故障发生后故障电流的特点，将现有的差动保护判据相互配合，分时段投入不同的保护子模块，形成了一套具有自适应特性的变压器差动保护的综合判据；其中，根据故障分量电流的方向自动调整常规比率差动的制动系数，以降低变压器内部轻微匝间故障时的制动作用是本文的一个创新。此外，论文对影响保护判据性能的励磁涌流、TA饱和、TA断线等问题给出了行之有效的解决方案。 软件设计是系统开发的一个重要环节，一般说来，软件可靠性内容包括保护原理的正确性、逻辑结构的严密性、计算方法的准确性和平稳性。基于工程项目，本文针对以上软件设计要求，对DSP平台的底层软件以及保护的软件进行了设计，并进行了实际的编程和调试来实现软件功能。最后，RTDS试验结果表明：本文所研究的自适应变压器差动保护是一种比较理想的保护，它能够根据变压器的运行情况和故障状态的变化，实时改变动作判据，以便使其保护性能达到最优。

Power transformer is an important equipment in the electrical power system, its safety running relates weather the whole electrical power system can run steadily. Therefore the protective measures to the transformer appears especially importantly; As a result of the transformer own characteristic and the electrical power system complexity, the reliability of the existing transformer differential protection still by far is smaller than the differential protection on the line application. In view of this point, this article is to unify the present existing transformer differential protection criterions，and to design a new adaptive transformer differential protection with better performance and based on the DSP platform. After analyzing the advantages and disadvantages of the domestic and alien current differential protection criterions, paper design an integrative criterion bases on the fault current characteristic after the breakdown. This criterion combines existing differential protection criterions and makes different criterions part work in different time after fault. Among them, the way using the direction of fault component to automatically adjust breaking coefficient is an innovation in this paper. The software design is an important part in system important. Generally, software reliability includes protection principle accuracy, logical organization strictness, computational method accuracy and stability. Based on the engineering project, paper has carried on the design to DSP platform software as well as protection software, and has carried on the actual programming and debugs to realize the software function. Finally, the RTDS test result indicated that the adaptive transformer differential protection in this paper is one kind of quite ideal protection. It can real-time change protection criterion according to the change of transformer movement and fault station to enables its protection performance to achieve superiorly.