Question
Download Solution PDFThe voltage regulation of the transformer will be negative when the power factor angle (φ) is :
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFVoltage Regulation
Voltage Regulation of single-phase transformers is the percentage (or per unit value) change in its secondary terminal voltage compared to its original no-load voltage under varying secondary load conditions.
The voltage regulation is given by:
% \(VR={V_{nl}-V_{fl}\over V_{nl}}\times 100\)
Voltage regulation curve:
Explanation
The voltage regulation is calculated by:
\(VR=IR \space cos\phi \space + \space IX \space sin\phi\)
For negative voltage regulation:
\(IR \space cos\phi \space + \space IX \space cos\phi \space <0\)
\( sin\phi \space <{-R\over X}\space cos\phi\)
\( tan\phi \space <{-R\over X}\space \)
\( tan\phi \space >{R\over X}\space \)
\(\varphi>\tan ^{-1}\left(\frac{R}{X}\right)\)
Last updated on May 29, 2025
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