Distance Relaying Algorithm for a Single Line-to- Ground Fault on Single Infeed Transmission Lines

Modern power systems involve large amount of investment. An electric power system comprises of generation, transmission and distribution of electric energy. Growth of power systems has lead to very complex networks extended across large areas. In such situations, the proper functioning of a modern power system is heavily dependent upon the healthy operation of the transmission lines within it. Today’s EHV and UHV transmission lines are exposed to treacherous weather. Therefore, they are very likely to be subjected to different types of electrical faults. If the faults are not detected and removed quickly then, in the worst case, they may create instability of the power system, resulting in shut down of either the large parts of the network or the complete network. However, the causes and consequences of faults can be minimized by operating the power system in a proper way and using sophisticated protective relays.