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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...
This paper addresses a new relaying scheme for identifying the inrush current and short circuit current caused by internal fault on the basis of sudden changes detection using novel morphological gradient (NMG), transient current signals are then extracted by use of morphological opening and closing transform. Based on different characteristics of transient signals between the short circuit current...
Based on the characteristics of TCSC, the influence of TCSC on fault component distance protection is analyzed. With the new setting resistance to be ZZd-jXC, the action of fault component distance protection on the line equipped with TCSC is presented. It is concluded that the fault component distance protection will not act incorrectly, but the range of protection will be reduced, especially when...
When differential protective relays are applied to transformer protection, how to identify the magnetizing inrush current and short circuit current caused by internal fault is the key problem. Here, regarding the inrush current and short circuit current as the random signal, the sampled data are analyzed by correlation function principle in the digital signal processing (DSP) and the self-correlation...
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