Abstract：On the basis of the characteristics of transformer loop equation, a novel transformer main protection scheme based on the generalized fundamental power and the difference of loop equation is presented. Theoretically when the transformer is under sound condition the generalized fundamental power and the difference of loop equation are all equal to zero, when faults occur on transformer windings the generalized fundamental power is great and when faults occur on leading wires the difference of loop equation is great. Therefore the new scheme can reflects any faults within the protective zone, and additional inrush identification criterion is needless. There is no need to calculate the resistance and leakage inductance of transformer windings, only the name plate data are used, so the scheme is easy to be realized. The analysis results of test data show that by the novel scheme the mal-operation caused by inrush current can be prevented reliably, there is sufficient sensitivity when internal faults occur, and the performance of the transformer protection is improved considerably.
王雪, 王增平. 基于广义基波功率的新型变压器主保护方案[J]. 电工技术学报, 2012, 27(12): 191-198.
Wang Xue, Wang Zengping. Novel Transformer Main Protection Scheme Based on Generalized Fundamental Power. Transactions of China Electrotechnical Society, 2012, 27(12): 191-198.
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2012, Vol. 27 
