Methodology for testing and development of parameter-free fault locators for transmission lines

Electric Power Systems Research 138, pp. 92 – 98 (2016). Doi: 10.1016/j.epsr.2016.02.007.
Marjan Popov, Shreya Parmar, Gert Rietveld, Gary Preston, and Vladimir Terzija.

This paper presents a comparison between two different approaches towards fault location detection with and without applying transmission line parameters. Firstly, an impedance based parameter dependent algorithm, derived by using the modal transformation theory and Fast Fourier Transform is presented. The methodology has the ability to locate the fault whether it is on the overhead line or on the underground power cable. The second algorithm is an improved parameter-free fault location method that uses time synchronization. The unknown fault location will be determined from voltage and current phasors, synchronously measured at both line terminals. This approach of fault detection renders the prior knowledge of line parameters as obsolete, since they are sometimes difficult to assess. The paper presents the results of the algorithms tested through the use of ATPDraw simulations and MATLAB. Some results are validated with laboratory experiments. The results of the line parameter-independent model will be compared by those provided by the parameter-dependent model. Both algorithms are tested for single line to ground faults.

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