Abstract
In long transmission lines, the charging current caused by the shunt capacitance decreases the accuracy in impedance based fault location. To improve the accuracy of fault location, this paper presents a novel scheme, where two Digital Fault Recorders (DFRs) are installed in a line. They can send the transient data of the faults to the both ends of a line. To estimate the distance of a fault, impedance based fault location methods are applied with transient fault data of both ends protection relays and both DFRs installed in a line. To evaluate the proposed scheme, a laboratory setup has been developed. In the lab, several faults have been simulated and associated voltages and currents are injected to a relay IED to compare experimental results.
Highlights
Accurate fault location can expedite the repair of the faulted components, speed-up restoration, reduce outage time
Impedance based fault location methods are most used by utilities [3, 4]
One end impedance fault locators calculate the location of a fault based on the impedance from one end of a transmission line
Summary
Accurate fault location can expedite the repair of the faulted components, speed-up restoration, reduce outage time. Two-end algorithms estimate the location of fault using voltage and current form both the ends of a line. Transient fault data must be collected and synchronized from both ends of a transmission line. In order to have an accurate fault location, the data from both ends of a transmission line should be analyzed [8].
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