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http://dx.doi.org/10.5370/JEET.2013.8.2.262

A Boundary Protection for Power Distribution Line Based on Equivalent Boundary Effect  

Zhang, Xin (Dept. of Electrical Engineering, Tongji University)
Mu, Long-Hua (Dept. of Electrical Engineering, Tongji University)
Publication Information
Journal of Electrical Engineering and Technology / v.8, no.2, 2013 , pp. 262-270 More about this Journal
Abstract
A boundary protection method for power distribution line based on equivalent boundary effect is presented in this paper. In the proposed scheme, the equivalent resonance component with a certain central frequency is sleeve-mounted at the beginning of protected zone. The 'Line Boundary' is built by using boundary effect, which is created by introducing impedance in the primary-side of line. The 'Line Boundary' is significantly different from line wave impedance. Therefore, the boundary protection principle can be applied to power distribution line without line traps. To analyze the frequency characteristic corresponding to traveling-waves of introducing impedance in the primary-side of line, distributed parameters model of equivalent resonance component is established. The results of PSCAD/EMTDC simulation prove the obvious difference of voltage high frequency component between internal faults and external faults due to equivalent resonance component, and validate the scheme.
Keywords
Equivalent boundary effect; Equivalent resonance component; Power distribution line; Boundary protection;
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