S. S. Geramian, H. Askarian Abyaneh, S. H. H. Sadeghi, K. Mazlumi
Amirkabir University of Technology

ABSTRACT
This paper presents a concept of fault location observability and a new fault-location scheme for
transmission networks based on synchronized PMUs. Considering the high cost of phasor measurement
units, minimizing the number of PMUs is very significant. In this paper a new algorithm is introduced to
find an optimization problem for determining the place and minimum number of phasor measurement
units in order to find accurate place of any fault among power systems. PMUs are placed on the buses by
the so-called “one-bus spaced placement strategy,” which means that every two PMUs are spaced by one
bus as possible as that the minimal PMUs are achieved and the proposed fault-location scheme can work.
The accuracy of suggested algorithm is independent from the type of faults and the fault resistance. The
optimization problem is solved by "branch – and – bound" method. 41-bus Tehran Transmission Regional
Electric Network is used as a real case study.