A New GPS-based Digital Protection System for Smart Grids in Loop Structure

A New GPS-based Digital Protection System for Smart Grids in Loop Structure

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This paper presents a new digital protection system to solve the protection challenges in revlon colorstay lip liner plum future smart grids, i.e., fast protection and fault isolation in a loop-structured system with limited magnitude of fault current.The new system combines two protection algorithms, i.

e., a differential protection as the primary algorithm and an overcurrent protection as the backup one.The new system uses real-time Ethernet and digital data acquisition techniques to overcome the restriction on data transmission over large grids.The current measurements at different locations arrethe bush balm are time-synchronized by GPS clocks, and then transmitted to a central computer via the Ethernet.

As opposed to digital relays which often contain PMU functionality nowadays, this approach uses time stamps on the instantaneous current values.We build a prototype of the new system on a test-bed.The results from simulations and experiments have demonstrated that the protection system achieves fast and accurate protection.