Open AccessPhenomenon of Transformer Sympathetic Inrush and Analysis of an Example
Author(s) -
Ying Fan,
Qingjing Ji,
Huan Ma,
Zhongyang Chen,
Keli Shen
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1486/6/062039
Subject(s) - inrush current , differential protection , transformer , current transformer , transformer effect , linear variable differential transformer , electrical engineering , control theory (sociology) , distribution transformer , engineering , computer science , voltage , control (management) , artificial intelligence
According to a mal-operation accident of differential protection which is caused by the effect of a switching-on transformer with no load on a parallel running transformer in a 35KV substation, the emergency and the development of transformer sympathetic inrush current was analysed from the aspect of the flux. And the three-phase differential current and their second harmonic component were obtained, which shows that the mal-operation wasn’t caused by the low second harmonic component in the differential current but by the changed transfer characteristics of the current transformer, which leads to an increase in the differential current.