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In a power system, the transmission network is the backbone of electricity delivery from power plants to load centers; hence, it becomes a critical issue for electrical engineers to shorten the service restoration time after a fault occurrence on the transmission line. This application paper integrates the two- and three-terminal hybrid transmission line fault location algorithms based on synchronized phasor measurements into the proposed cloud-computing-based fault location system to inspect the feasibility and practicality of our algorithms for the real transmission-line incidents. The computing results are performed via Google Map for authorized personal computers and the application for intelligent mobile devices is developed to assist engineers in acquiring the fault-event information immediately as well as in figuring out the fault position intuitively and quickly due to its visualization and navigation. Last but not the least, the suggested fault location system has already been applied to the practical 345- and 161-kV transmission networks of Taiwan Power Company for achieving the combination of theory and practice. Up to the present, the proposed system still yields excellent performance verified by realistic fault data. [ABSTRACT FROM AUTHOR]

This paper presents an innovative fault location method for multi-terminal nonhomogeneous transmission lines by using synchronized voltage and current phasors acquired from phasor measurement units or intelligent electronic devices. We extend the previously published two-terminal and three-terminal nonhomogeneous transmission line fault location techniques developed in our lab to multi-terminal nonhomogeneous transmission lines. Specifically, a graph theory based indices and an optimal calculation data window is applied to identify the faulty line branch and to mitigate the undesirable influence caused by dc decay and the arc phenomenon of circuit breaker. The high performance of the proposed fault location method is validated by simulation results and real world utility fault data. [ABSTRACT FROM AUTHOR]

This letter presents a fault location technique for three-terminal hybrid AC transmission lines with one off-service line branch by using synchrophasor data obtained from buses which are connected to in-service line branches. The proposed method adopts the two-terminal fault location technique to identify the faulted line branch and locate the fault point when a fault exists on the in-service line branch. Contrarily, if a fault exists on the off-service line branch, the apparent reactance that is obtained from synchronized voltage and current phasor sets of the junction point P, and sequence networks are both chosen to calculate the exact fault point. The performance evaluation shows that the proposed idea has high accuracy under different fault types and resistance. [ABSTRACT FROM AUTHOR]