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The zero-sequence mutual inductance between parallel transmission lines can weaken the reliability of protective relay. As a novel zero-sequence directional element is proposed based on the model recognition theory, an inductance model is established for the internal fault. The model error is small for an internal fault while large and oscillating for an external fault. To solve the problem on the...
The zero-sequence directional protection on parallel lines will mal-operate for zero-sequence mutual inductance. An inductance model for an internal fault is established and a model error function is defined on model recognition theory by analyzing the fault equivalent circuit. The model error is small for an internal fault while large and oscillating for an external fault. To solve the problem caused...
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