Question
Download Solution PDFA relay is connected to a 400/5 ratio current transformer with circuit setting of 150%. Calculate the plug setting multiplier when circuit carries a fault current of 3000 A.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Plug setting multiplier is the ratio of fault current and the product of plug setting and CT ratio.
Plug setting multiplier \(= \frac{{fault\;current}}{{plug\;setting \times CT\;ratio}}\)
Calculation:
Plug setting = relay setting × secondary CT current
= 1.5 × 5 = 7.5
CT ratio \(= \frac{{400}}{5} = 80\)
Plug setting multiplier \(= \frac{{3000}}{{7.5 \times 80}} = 5\)Last updated on May 9, 2025
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