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A Current Transformer Saturation Detection Algorithm for Use in Current Differential Protection

机译：用于电流差动保护的电流互感器饱和检测算法

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摘要

A current transformer (CT) saturation detection algorithm for use in current differential protection is described. The algorithm evaluates the start and end of each CT saturation period using the "largest modulus series"; this is derived from the third order difference function applied to the secondary current. To reduce the possibility of false detection due to the effect of noise on the third order difference function, the ratios of the absolute values of the CT secondary induced voltage are also used as a criteria to determine when the CT is saturated. A blocking signal is activated when saturation is first detected and is maintained for the duration of the saturation period plus one cycle. Simulation results indicate that the algorithm can significantly enhance the stability of the difference method. The algorithm successfully detects saturation and prevents the maloperation of a current differential protection scheme during high current external faults; whilst ensuring high sensitivity on internal faults.
机译：描述了一种用于电流差动保护的电流互感器（CT）饱和检测算法。该算法使用“最大模数序列”评估每个CT饱和周期的开始和结束。这是从应用于次级电流的三阶差分函数得出的。为了减少由于噪声对三阶差分函数的影响而导致错误检测的可能性，CT次级感应电压的绝对值之比也用作确定CT何时饱和的标准。阻塞信号在首次检测到饱和时被激活，并在饱和周期加一个周期内保持不变。仿真结果表明，该算法可以显着提高差分方法的稳定性。该算法成功地检测到饱和并防止在大电流外部故障期间电流差动保护方案的误操作;同时确保对内部故障的高度敏感性。

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