基于波形相似度的抗电流互感器饱和变压器相位差动保护

变压器差动保护中电流互感器饱和导致保护可靠性与速动性降低。文中利用波形相似度对变压器区内、区外故障,尤其是电流互感器饱和时两侧电流相位信息进行提取,提出一种基于波形相似度的抗电流互感器饱和变压器差动保护判据,以识别包含电流互感器饱和在内的各种故障情况。仿真与动模试验结果表明,该判据在识别变压器区内、外故障,尤其是电流互感器饱和时均能做出正确判断。对于噪声干扰的情况仅需做简单处理判据即可有效识别故障。

Waveform Similarity Based Transformer Phase Differential Protection Against Current Transformer Saturation

The saturation of current transformer results in the decrease of reliability and rapidity of transformer differential protection. The waveform similarity is used to extract the phase information of the current on both sides of the transformer, especially when the current transformer is saturated. A transformer differential protection criterion against current transformer saturation based on waveform similarity is proposed to identify various faults including saturation of current transformer. The results of simulation and dynamic simulation tests show that the criterion can make correct judgments when identifying faults inside and outside the transformer, especially when the current transformer is saturated. In the case of noise interference, the fault can be identified effectively only by simple processing.