Transformer Professor Mohamed A. El-Sharkawi - PowerPoint PPT Presentation

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Transformer Professor Mohamed A. El-Sharkawi

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Transformer Professor Mohamed A. El-Sharkawi Why do we need transformers? Increase voltage of generator output Transmit power and low current Reduce cost of ... – PowerPoint PPT presentation

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Title: Transformer Professor Mohamed A. El-Sharkawi


1
Transformer Professor Mohamed A. El-Sharkawi
2
Why do we need transformers?
  • Increase voltage of generator output
  • Transmit power and low current
  • Reduce cost of transmission system
  • Adjust voltage to a usable level
  • Create electrical isolation
  • Match load impedance
  • Filters

3
Basic Components
Iron Core
4
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5
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6
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7
Basic AnalysisVoltage
  • Volts/turn is constant
  • Voltages are in phase (no phase shift)
  • Magnitudes vary with turns ratio.

8
Basic Analysis Power and current
  • Currents are in phase.
  • Current ratio is opposite to the voltage ratio

9
Basic Analysis Reflected impedance
10
Ideal Transformer Ratings
  • 100 MVA, 13.8/138 KV

11
Ideal Transformer Ratings
100 MVA, 138/13.8 KV
12
Actual Transformer
  • Windings
  • Resistance
  • Inductance
  • Core
  • Eddy Current
  • Hysteresis

13
Windings Impedance
14
Core Hysteresis
15
i
16
Core Model
Let
17
Core Model
Let
18
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19
Equivalent Circuit
X1
R1
R2
X2
N1
N2
Io
I1
I2
V1
E1
V2
E2
Ro
Xo
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