Abstract
This paper presents a data refinement process for fault data recorded by a group of associated digital fault recorders (DFR) for improving accuracy in line fault location in a transmission system. The refinement process employs weighted least square state estimation technique to compute calibration factors, using the measurements of pre-fault data of voltage and current from multiple correlated DFRs. The factors then are applied to correcting the corresponding during-fault data. To verify the effectiveness of the proposed refinement method, both simulated data from the IEEE 14 bus test system and field measured data from the Thailand's transmission system have been tested using the standard two-terminal fault location algorithm. Test results strongly confirm that the improved accuracy in locating fault on a transmission line can be obtained when compares to the respective unrefined cases.
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