Analysis and Improvement of Differential Current Protection Action of Converter Transformer
The correct differential protection action of the converter transformer is crucial for the safe and stable oper-ation of the DC system.Due to some converter stations not considering the harmonic braking function in the differential protection design of the converter winding,the protection device cannot correctly distinguish between excitation inrush current and internal fault current,resulting in protection malfunction during charging of the converter due to excitation in-rush current.In response to this issue,this article mainly combines the modeling and simulation of a case study of a cer-tain converter station operating on the differential protection of the converter winding,analyzes the reasons for the differ-ential protection action of the converter transformer grid side winding at the converter station,in this paper,the setting value of the winding differential current protection lock-up criterion for Hausdorff distance is set through simulation anal-ysis,so as to avoid the winding differential protection malfunction caused by the inconsistent CT saturation characteristics during commutation charging.
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