Definition: System Impedance Ratio

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Source Impedance Ratio (SIR) Calculation – Electric power & transmission & distribution – Eng-Tips
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A tutorial on calculating source impedance ratios for determining line length – IEEE Conference Publication
Impedance matching – Wikipedia
The Importance of the X/R Ratio in Short Circuit Calculations
IEC 60050 – International Electrotechnical Vocabulary – Details for IEV number 448-14-14: “system impedance ratio”

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