Abstract：The wide-area protection is one of the important directions for the development of relay protection, and wide-area differential protection is an important branch. In this paper, the overall architecture of the wide-area differential protection based on IEC61850 is proposed, the basic concepts of the differential ring is defined, and action criterion and method of the wide-area differential protection is proposed. The blocking conditions of the wide-area differential protection are described, and the dynamic extension of differential ring in case of a branch failure is analyzed. The wide-area differential protection based on the differential ring is effective solution to the existing failure protection easy to malfunction and the dead zone fault. Dynamic simulation system verifies the feasibility and correctness of the proposed method.
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2014, Vol. 29 
