Locating Faults in Double-Circuit Lines Using Limited Measurements from Faulted Circuit

This work proposes a novel fault location system for double-circuit transmission lines which can be deployed in the current line differential relays. This eliminates the need for any additional hardware or communication costs to deploy the solution. The solution uses only voltage and current measurements from local terminal and current measurement from remote terminal of the faulted circuit. Any current measurement from the healthy parallel circuit is not required for zero sequence mutual coupling compensation. Instead, current in the healthy parallel circuit is estimated using available local voltage and current measurements and remote current measurement of the faulted circuit. The proposed algorithm is tested and proved for various practical fault scenarios by varying fault location, fault resistance, fault type, fault inception angle and source to line impedance ratios.