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Transmission lines are operating close to their limit with the promotion of power networks interconnection. The possible non-fault overload caused by the transferred flow from a removed line may lead to incorrect operation of zone 3 distance protection, which is considered as the origin of several well-known cascading trips. Taking advantage of wide area measurement system (WAMS), a novel scheme is...
Concerning the actual status of protection in the power grid, a new strategy is proposed in this paper to prevent the chain tripping accident. Logical judgment is reasonably arranged in this strategy, some logic judgments are set before reclosing, in order to make full use of the reclosing time, and put the rest of the logical judgment between the start of the back-up protection and reclosing. On...
A new transformer protection theory based on spectral entropy characteristics is put forward in this paper. First, the algorithm of empirical mode decomposition (EMD) and entropy are developed, and variation trends of spectral entropy characteristics are analyzed in the case of inrush currents and internal fault currents. EMD algorithm is used to conduct the accurate location of current breaks and...
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