A NEW DISTANCE PROTECTION SCHEME BASED ON COMBINATION OF IMPEDANCE AND TRAVELLING WAVE MEASUREMENTS

Document Type : Original Article

Authors

1 1Helwan machinery and equipment Company, Cairo, Egypt

2 2Department of Electrical Machines& Power Engineering, Helwan University, Cairo, Egypt

3 Department of Electrical Machines& Power Engineering, Helwan University

Abstract

In this technique the relay can detect the fault and can discriminate between internal and external fault without the need for communication links. That combines of both impedance based methods and traveling wave based methods has been developed and presented in this paper. The proposed method first determines whether the fault is backward or forward to the measured relay and then determines if the fault is grounded or ungrounded. Next, the impedance based method is used to identify the fault for ungrounded faulted. Finally the traveling wave method is used to detect the fault for grounded fault by using the ground and Ariel mode. The simulation results indicate a good accuracy and more security of the suggested protection scheme compared with others schemes with different types of faults, fault resistances and fault inception angles using MATLAB/SIMLINK simulation

Keywords

Port-Said Engineering Research Journal
Volume 17, Issue 1
March 2013
Pages 137-145

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