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With the fast development of the modern power system, the current transformer (CT) saturation problem is most serious, causing the measuring error of primary current and the maloperation of protection. This article proposes a CT transient simulation model based on the Jiles–Atherton theory. The key coefficients of the CT model that define the basic magnetizing characteristics are identified based...
Several cases of unusual mal-operation of the current differential protection for transformer, generator and transmission line already in service, due to the adjacent transformer switching-on, have been reported. The complex inrush current, including the magnetizing inrush current and the sympathetic inrush current, is considered to be relevant with this sort of mal-operation. However, the detail...
The sympathetic inrush is a hot issue in the field of differential protection research, due to its characteristic of concealment, diversity, and complexity. The mal-operation of differential protection probably caused by sympathetic inrush is still a difficult problem to be solved. This paper proposed a new sympathetic inrush detection method based on the on-line magnet flux calculating by integrating...
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