By Galperin Yu.M.
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Additional resources for Non-stationary electric and optical properties of bulk conducting materials and low-dimensional structures
Immunity from DC component and good suppression of exponentially decaying offset due to the large value of X=R time constants in generators; immunity to harmonics; nominal response time of one cycle for the protective functions requiring fast response. Since sequence quantities are computed mathematically from the voltage and current phasors, they will also benefit from the above advantages. However, it should be kept in mind that fundamental phasors of waveforms are not the only parameters used in digital multifunction relays.
As an example, if a 51V is implemented on all three phases independently, it will be sufficient to block the function only on the phase on which a fuse has been detected as blown. Furthermore, contrary to the conventional voltage balance relay scheme, a single VT will suffice when using this modern algorithm. Because of the different functions recording their characteristics over a large frequency interval, it is no longer necessary to monitor the frequency in order to implement start-up or shut-down protection.
2 Effect of infeed on local relays. H. , 1995. K. ) ß 2006 by Taylor & Francis Group, LLC. 1 Fuses The most commonly used protective device in a distribution circuit is the fuse. Fuse characteristics vary considerably from one manufacturer to another and the specifics must be obtained from their appropriate literature. 3 shows the time-current characteristics which consist of the minimum melt and total clearing curves. Minimum melt is the time between initiation of a current large enough to cause the current responsive element to melt and the instant when arcing occurs.