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Comparison of the performance of different directional polarizing methods in cross country fault protection of a MV Loop

The correct position detection of cross country faults (CCFs) occurring in MV network loops with Petersen coil compensated neutral or not grounded star point can sometimes be critical. This paper examines the performance of overcurrent directional relays protecting a MV distribution loop in an existing power system. The MV network has been modelled in the calculation software DIgSILENT PowerFactory. Different polarizing methods, based on data from the manuals of commercially available protective devices, have been implemented in the relay models. The performance of the zero sequence directional polarizing algorithm has been compared with the performance of the negative sequence phasor directional polarizing method and of the negative sequence impedance directional algorithm. The comparison has been performed using steady state short circuit calculations and electromagnetic transient (EMT) simulations. The results make clear the limitations of the zero sequence directional polarizing method and clearly show the importance of the detailed modelling of protective devices in network protection studies.

Author(s):

Alberto Borgnino    
DIgSILENT GmbH
Germany

Manuel Castillo    
DIgSILENT GmbH
Germany

 

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