Simulation results indicate that dual slope algorithm is of high stability during external faults and is very sensitive to high impedance internal faults.
仿真结果表明：双比率算法较单比率算法，具有外部故障高稳定性，而在内部高阻故障时，也有很高的灵敏度。
Based on this, the paper presents a new transformer protection criterion to distinguish internal faults and external faults by correlation coefficients of sampled current values.
在此基础上，提出一种基于电流采样值相关度的变压器保护新判据，利用变压器两侧电流采样值波形的相关度来区分内部故障和外部故障。
Theoretical analysis and simulation results indicate that the novel criterion has higher sensitivity during internal faults and better anti CT saturation performance during external faults.
理论分析及仿真结果表明，新算法具有更好的内部故障灵敏度和外部故障抗CT饱和能力。
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