变压器微机保护新算法的研究及其应用

APPLICATION AND RESEARCH ON NEW ALGORITHM FOR MICROCOMPUTER-BASED TRANSFORMER RELAYING PROTECTION

简要介绍了传统的变压器保护算法，并指出了该算法存在的问题：利用变压器数学模型和物理模型，采用电流和电压两种参量，详细分析了变压器空载合闸和内部故障时负序差动功率比率的特点，提出了变压器负序差动功率比率保护算法。动态模拟实验表明了该算法的可行性。

The traditional transformer protection is introduced briefly, and the existing problems are pointed out in this paper. TheRDNSP(Ratio of Differential Negative Sequence Power)is analyzed in detail when the transformer is energinzed and inner faults occur.On the basis of this,a new algorithm for transformer protection using RDNSP is presented. The simulating test shows that thepresented algorithm is reasonable.