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Effects of frequency dependence and line parameters on single ended travelling wave based fault location schemes

Effects of frequency dependence and line parameters on single ended travelling wave based fault location schemes

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© The Institution of Electrical Engineers
Published

The effects of frequency dependence, line asymmetry, and varying ground conductivity on ultrahigh speed, travelling wave based, single ended, protection schemes are investigated in this paper. Typical schemes assume the transmission lines to be balanced and frequency independent which simplifies the analysis of the fault transients. Investigation of a single circuit vertically configured transmission line reveals that better results can be obtained by using modal parameters based on the configuration of the transmission line. The problem of modal mixing at discontinuities on the transmission line is demonstrated in the case of an unbalanced line to ground fault. The results described in this paper have applications in both protection and fault location schemes.

Inspec keywords: fault location; power transmission lines; power system protection

Other keywords: protection; modal mixing; frequency dependence; vertically configured transmission line; unbalanced line; line asymmetry; single ended travelling wave; fault location; single circuit; line parameters; modal parameters; transmission lines; varying ground conductivity

Subjects: Power system protection

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