Lecture16

Lecture16 - T-Line Equivalent Circuits Three general models...

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Page 1 Fundamentals of Power Systems Lecture 16 1 T-Line Equivalent Circuits z Three general models for equivalent transmission line circuits ± Choice influenced by the line length, type (cable or overhead line), and operating voltage level ± Choice based on the analysis (e.g., short circuit or voltage drop) z Models ± Short Length Line ± Medium Length Line ± Long Length Line Fundamentals of Power Systems Lecture 16 2 Short Length Line Model z Used for ± low- and medium-voltage overhead lines ± high-voltage lines with lengths less than ~50 miles ± low-voltage cable circuits z Neglects the effect of the line shunt capacitance z Lumps the line series impedance into a resistance and inductance equivalent R line jX line Sending End Receiving End V S V R I S I R X line = X’·d R line = R’·d Length of line
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Page 2 Fundamentals of Power Systems Lecture 16 3 Medium Length Line Model z Used for ± high-voltage overhead lines longer than ~50 mi & less than ~150 mi ± medium- and high-voltage cable circuits z
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Lecture16 - T-Line Equivalent Circuits Three general models...

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