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The utility of distributed generation brings about different types of impact to the relay protection of distribution system, which the conventional methods of distribution system protection could hardly be adapted to. The mainly performance of that is the malfunction of protective relaying with high penetration of DGs. Moreover, during fault, series of harmonics and aperiodic components exist in the...
With the application of high and extra-high voltage transformer, traditional differential protection algorithm based on half period data window will possess a switching interval of 30ms or even longer, which could hardly satisfy the quickness of protective relaying. When external fault occurs, inceptive fault transient component, inrush current, CT saturation, and harmonics would amplify the unbalance...
In a digital substation, protection equipment may get data from different digital sources. This paper researched a form of multi digital sources. As link devices between primary side and secondary side, optical current transformers (OCT) may run on different sampling frequencies. Literatures have proposed that by the means of TCFIR [1], differential protection can get signals with the same sampling...
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