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 future smart grids, i.e., fast protection and fault isolation in a catherine lansfield ombre rainbow clouds eyelet curtains 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 are time-synchronized by GPS clocks, and then transmitted to a central computer via the Ethernet.

As opposed to digital 355 maybelline fit me 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.