A novel single-end fault location method for double-circuit transmission lines.

• A new single-end fault location method is proposed for double-circuit transmission lines. • It does not require knowing the impedance of the remote end source. • Just one formulation is used for all symmetrical and asymmetrical faults, both transposed and untransposed lines. • It is suitable for fault location of double-circuit with non-identical circuits. • It reduces the negative effect of unknown fault impedance. A new fault location method based on single-end measurements is proposed in this paper. The proposed method decomposes the fault location problem into two sub-problems and uses the voltage and current phasors of one of the line ends to solve the sub-problems. In the first iteration, an initial value is assumed for the fault location and then, based on the network equations, the first sub-problem calculates fault characteristics such as its voltage, current, and impedance which are fed into the second sub-problem as its inputs. Then, the second sub-problem updates the estimated fault location based on the received inputs. This approach is efficient and comprehensive method in the sense that it is not susceptible to the value of fault impedance, it is applicable for symmetrical and asymmetrical faults, transposed and untransposed lines, identical and non-identical circuits, and both short and long double circuit transmission lines. Finally, the method converges quickly in maximum three iterations although it is iterative. Numerous case studies by changing the line length, fault impedance, location of fault, line characteristics and noise level are carried out using distributed line model to verify the effectiveness of the proposed method. [ABSTRACT FROM AUTHOR]