A novel Hausdorff distance based restrain criterion for zero-sequence differential protection of converter transformer
A novel Hausdorff distance based restrain criterion for zero-sequence differential protection of converter transformer
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一种新的基于Hausdorff距离的换流变压器零序差动保护约束判据
DOI：
10.1016/j.ijepes.2018.08.046
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发表时间：
2019-02
影响因子：
5.2
通讯作者：
Weng Hanli
中科院分区：
文献类型：
--
作者：
Ding Suyang;Lin Xiangning;Zhang Zheyuan;Li Zhengtian;Chen Le;Weng Hanli
零序差动保护以其灵敏度高、动作速度快等优点，成为超高压和特高压变压器最常用的主保护。一般认为，由于励磁涌流在理论上是不受影响的，因此，对励磁涌流的抑制不需要额外的抑制判据。然而，研究发现，换流Transformer中由于铁心饱和而产生的零序电流偏置会导致电流互感器铁心内偏磁的积累，特别是在外部故障切除期间。这可能会导致CFDDP的误操作。本文在Hausdorff图形识别算法的基础上，提出了一种新的约束准则。仿真和理论分析表明，该准则不会影响传统的CCDDP的性能。该判据能正确识别伪差流，有效防止恢复涌流引起的误动。
Due to its high sensitivity and fast operation rapidity, zero-sequence differential protection (ZSDP) has become the most frequently used main protection for EHV and UHV power transformers. It is generally assumed that extra restrain criterion is unnecessary for ZSDP since it is immune to the magnetizing inrush current in theory. However, it’s found that the bias of zero sequence current in converter transformer due to core saturation may lead to the accumulation of magnetic bias within the core of CT, especially during external fault removal period. This may lead to the mal-operation of ZSDP. Based on the Hausdorff graphics recognition algorithm, an extra restrain criterion for ZSDP is proposed in this paper. Verified by simulation and theoretical analysis, the proposed criterion will not influence the performance of traditional ZSDP. However, the proposed criterion can correctly identify the fake differential current and effectively prevent the mal-operation of ZSDP caused by the recovery inrush.
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影响因子：
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作者：
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通讯作者：
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