Transcription of Lesson 10: Transformer Performance and Operation
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Lesson 10: Transformer Performance and Operation
2/9/2016. Lesson 10: Transformer Performance and Operation ET 332b Ac Motors, Generators and Power Systems Lesson 1. Learning Objectives After this presentation you will be able to: Define Transformer voltage regulation and compute its value Convert impedance values into per unit or percent values based on Transformer rating or other given values Perform calculations using the per unit system Convert per unit/percent values into circuit values Compute Transformer circuit parameters from test values. Lesson 2. 1. 2/9/2016. Transformer Voltage Regulation Definition: Difference between output voltage at no load and output voltage at rated load divided by rated voltage V VR . %VR NL 100%.. VR . Where VR = rated output voltage Note: all voltages are VNL = full load output voltage magnitude only Also given in "Per Unit" - fraction from 0 - V VR.
Transformer Losses and Efficiencies Lesson 10_et332b.pptx 29 Definition of efficiency Where: P o = transformer output power P core = transformer core losses (from Open Circuit test) I L = load current (primary or secondary) R eq = total equivalent coil resistance (referred to primary or secondary (from Short Circuit test) eq 2 o core L o P I R P K
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