一种基于直方图对称关联度的电流互感器饱和检测算法

电流互感器（TA）饱和是一种物理现象,可能导致保护继电器的误动作。针对这种现象，提出一种利用频率分布直方图结合关联度的方法检测TA的饱和情况。首先对TA二次侧电流进行采样分析，然后利用波形镜像变换技术将波形变换，并做出其直方图，计算出其对称关联度，与定值比较即可判断TA是否发生饱和。算法简单可靠，具有精度高，计算速度快的特点，对于继电保护领域检测TA饱和，提高保护动作的可靠性，维护系统正常运行等方面具有重要的参考意义。

TA Saturation Detection Algorithm Based on Histogram Symmetry Correlation

Current transformer (TA) saturation is a physical phenomenon which could lead to protective relay malfunction. A TA saturation detection method using frequency distribution histograms combining symmetry correlation is proposed. First of all, TA secondary current is sampled and analyzed, and then wave conversion is transformed by using waveform image transformation technology. Then, correlation degree of symmetry is calculated with generated histogram. Finally, the correlation degree is compared with setting value to determine whether current transformer saturation occurs or not. Proposed algorithm is simple, reliable, accurate and fast. It has important reference value for detecting TA saturation, improving the reliability of action and maintaining system operation.